Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

98 files changed, 37729 insertions, 0 deletions

diff --git a/arch/arm64/kvm/.gitignore b/arch/arm64/kvm/.gitignore
new file mode 100644
index 000000000..6182aefb8
--- /dev/null
+++ b/arch/arm64/kvm/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+hyp_constants.h
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
new file mode 100644
index 000000000..815cc118c
--- /dev/null
+++ b/arch/arm64/kvm/Kconfig
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# KVM configuration
+#
+
+source "virt/lib/Kconfig"
+source "virt/kvm/Kconfig"
+
+menuconfig VIRTUALIZATION
+	bool "Virtualization"
+	help
+	  Say Y here to get to see options for using your Linux host to run
+	  other operating systems inside virtual machines (guests).
+	  This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and
+	  disabled.
+
+if VIRTUALIZATION
+
+menuconfig KVM
+	bool "Kernel-based Virtual Machine (KVM) support"
+	depends on HAVE_KVM
+	select MMU_NOTIFIER
+	select PREEMPT_NOTIFIERS
+	select HAVE_KVM_CPU_RELAX_INTERCEPT
+	select HAVE_KVM_ARCH_TLB_FLUSH_ALL
+	select KVM_MMIO
+	select KVM_GENERIC_DIRTYLOG_READ_PROTECT
+	select KVM_XFER_TO_GUEST_WORK
+	select SRCU
+	select KVM_VFIO
+	select HAVE_KVM_EVENTFD
+	select HAVE_KVM_IRQFD
+	select HAVE_KVM_MSI
+	select HAVE_KVM_IRQCHIP
+	select HAVE_KVM_IRQ_ROUTING
+	select IRQ_BYPASS_MANAGER
+	select HAVE_KVM_IRQ_BYPASS
+	select HAVE_KVM_VCPU_RUN_PID_CHANGE
+	select SCHED_INFO
+	select GUEST_PERF_EVENTS if PERF_EVENTS
+	select INTERVAL_TREE
+	help
+	  Support hosting virtualized guest machines.
+
+	  If unsure, say N.
+
+config NVHE_EL2_DEBUG
+	bool "Debug mode for non-VHE EL2 object"
+	depends on KVM
+	help
+	  Say Y here to enable the debug mode for the non-VHE KVM EL2 object.
+	  Failure reports will BUG() in the hypervisor. This is intended for
+	  local EL2 hypervisor development.
+
+	  If unsure, say N.
+
+config PROTECTED_NVHE_STACKTRACE
+	bool "Protected KVM hypervisor stacktraces"
+	depends on NVHE_EL2_DEBUG
+	default n
+	help
+	  Say Y here to enable pKVM hypervisor stacktraces on hyp_panic()
+
+	  If using protected nVHE mode, but cannot afford the associated
+	  memory cost (less than 0.75 page per CPU) of pKVM stacktraces,
+	  say N.
+
+	  If unsure, or not using protected nVHE (pKVM), say N.
+
+endif # VIRTUALIZATION
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
new file mode 100644
index 000000000..5e33c2d46
--- /dev/null
+++ b/arch/arm64/kvm/Makefile
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Kernel-based Virtual Machine module
+#
+
+ccflags-y += -I $(srctree)/$(src)
+
+include $(srctree)/virt/kvm/Makefile.kvm
+
+obj-$(CONFIG_KVM) += kvm.o
+obj-$(CONFIG_KVM) += hyp/
+
+kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \
+	 inject_fault.o va_layout.o handle_exit.o \
+	 guest.o debug.o reset.o sys_regs.o stacktrace.o \
+	 vgic-sys-reg-v3.o fpsimd.o pkvm.o \
+	 arch_timer.o trng.o vmid.o \
+	 vgic/vgic.o vgic/vgic-init.o \
+	 vgic/vgic-irqfd.o vgic/vgic-v2.o \
+	 vgic/vgic-v3.o vgic/vgic-v4.o \
+	 vgic/vgic-mmio.o vgic/vgic-mmio-v2.o \
+	 vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \
+	 vgic/vgic-its.o vgic/vgic-debug.o
+
+kvm-$(CONFIG_HW_PERF_EVENTS)  += pmu-emul.o pmu.o
+
+always-y := hyp_constants.h hyp-constants.s
+
+define rule_gen_hyp_constants
+	$(call filechk,offsets,__HYP_CONSTANTS_H__)
+endef
+
+CFLAGS_hyp-constants.o = -I $(srctree)/$(src)/hyp/include
+$(obj)/hyp-constants.s: $(src)/hyp/hyp-constants.c FORCE
+	$(call if_changed_dep,cc_s_c)
+
+$(obj)/hyp_constants.h: $(obj)/hyp-constants.s FORCE
+	$(call if_changed_rule,gen_hyp_constants)
+
+obj-kvm := $(addprefix $(obj)/, $(kvm-y))
+$(obj-kvm): $(obj)/hyp_constants.h
diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c
new file mode 100644
index 000000000..bb24a76b4
--- /dev/null
+++ b/arch/arm64/kvm/arch_timer.c
@@ -0,0 +1,1388 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/cpu.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/uaccess.h>
+
+#include <clocksource/arm_arch_timer.h>
+#include <asm/arch_timer.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+
+#include <kvm/arm_vgic.h>
+#include <kvm/arm_arch_timer.h>
+
+#include "trace.h"
+
+static struct timecounter *timecounter;
+static unsigned int host_vtimer_irq;
+static unsigned int host_ptimer_irq;
+static u32 host_vtimer_irq_flags;
+static u32 host_ptimer_irq_flags;
+
+static DEFINE_STATIC_KEY_FALSE(has_gic_active_state);
+
+static const struct kvm_irq_level default_ptimer_irq = {
+	.irq	= 30,
+	.level	= 1,
+};
+
+static const struct kvm_irq_level default_vtimer_irq = {
+	.irq	= 27,
+	.level	= 1,
+};
+
+static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx);
+static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
+				 struct arch_timer_context *timer_ctx);
+static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx);
+static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
+				struct arch_timer_context *timer,
+				enum kvm_arch_timer_regs treg,
+				u64 val);
+static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
+			      struct arch_timer_context *timer,
+			      enum kvm_arch_timer_regs treg);
+
+u32 timer_get_ctl(struct arch_timer_context *ctxt)
+{
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch(arch_timer_ctx_index(ctxt)) {
+	case TIMER_VTIMER:
+		return __vcpu_sys_reg(vcpu, CNTV_CTL_EL0);
+	case TIMER_PTIMER:
+		return __vcpu_sys_reg(vcpu, CNTP_CTL_EL0);
+	default:
+		WARN_ON(1);
+		return 0;
+	}
+}
+
+u64 timer_get_cval(struct arch_timer_context *ctxt)
+{
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch(arch_timer_ctx_index(ctxt)) {
+	case TIMER_VTIMER:
+		return __vcpu_sys_reg(vcpu, CNTV_CVAL_EL0);
+	case TIMER_PTIMER:
+		return __vcpu_sys_reg(vcpu, CNTP_CVAL_EL0);
+	default:
+		WARN_ON(1);
+		return 0;
+	}
+}
+
+static u64 timer_get_offset(struct arch_timer_context *ctxt)
+{
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch(arch_timer_ctx_index(ctxt)) {
+	case TIMER_VTIMER:
+		return __vcpu_sys_reg(vcpu, CNTVOFF_EL2);
+	default:
+		return 0;
+	}
+}
+
+static void timer_set_ctl(struct arch_timer_context *ctxt, u32 ctl)
+{
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch(arch_timer_ctx_index(ctxt)) {
+	case TIMER_VTIMER:
+		__vcpu_sys_reg(vcpu, CNTV_CTL_EL0) = ctl;
+		break;
+	case TIMER_PTIMER:
+		__vcpu_sys_reg(vcpu, CNTP_CTL_EL0) = ctl;
+		break;
+	default:
+		WARN_ON(1);
+	}
+}
+
+static void timer_set_cval(struct arch_timer_context *ctxt, u64 cval)
+{
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch(arch_timer_ctx_index(ctxt)) {
+	case TIMER_VTIMER:
+		__vcpu_sys_reg(vcpu, CNTV_CVAL_EL0) = cval;
+		break;
+	case TIMER_PTIMER:
+		__vcpu_sys_reg(vcpu, CNTP_CVAL_EL0) = cval;
+		break;
+	default:
+		WARN_ON(1);
+	}
+}
+
+static void timer_set_offset(struct arch_timer_context *ctxt, u64 offset)
+{
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch(arch_timer_ctx_index(ctxt)) {
+	case TIMER_VTIMER:
+		__vcpu_sys_reg(vcpu, CNTVOFF_EL2) = offset;
+		break;
+	default:
+		WARN(offset, "timer %ld\n", arch_timer_ctx_index(ctxt));
+	}
+}
+
+u64 kvm_phys_timer_read(void)
+{
+	return timecounter->cc->read(timecounter->cc);
+}
+
+static void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map)
+{
+	if (has_vhe()) {
+		map->direct_vtimer = vcpu_vtimer(vcpu);
+		map->direct_ptimer = vcpu_ptimer(vcpu);
+		map->emul_ptimer = NULL;
+	} else {
+		map->direct_vtimer = vcpu_vtimer(vcpu);
+		map->direct_ptimer = NULL;
+		map->emul_ptimer = vcpu_ptimer(vcpu);
+	}
+
+	trace_kvm_get_timer_map(vcpu->vcpu_id, map);
+}
+
+static inline bool userspace_irqchip(struct kvm *kvm)
+{
+	return static_branch_unlikely(&userspace_irqchip_in_use) &&
+		unlikely(!irqchip_in_kernel(kvm));
+}
+
+static void soft_timer_start(struct hrtimer *hrt, u64 ns)
+{
+	hrtimer_start(hrt, ktime_add_ns(ktime_get(), ns),
+		      HRTIMER_MODE_ABS_HARD);
+}
+
+static void soft_timer_cancel(struct hrtimer *hrt)
+{
+	hrtimer_cancel(hrt);
+}
+
+static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id)
+{
+	struct kvm_vcpu *vcpu = *(struct kvm_vcpu **)dev_id;
+	struct arch_timer_context *ctx;
+	struct timer_map map;
+
+	/*
+	 * We may see a timer interrupt after vcpu_put() has been called which
+	 * sets the CPU's vcpu pointer to NULL, because even though the timer
+	 * has been disabled in timer_save_state(), the hardware interrupt
+	 * signal may not have been retired from the interrupt controller yet.
+	 */
+	if (!vcpu)
+		return IRQ_HANDLED;
+
+	get_timer_map(vcpu, &map);
+
+	if (irq == host_vtimer_irq)
+		ctx = map.direct_vtimer;
+	else
+		ctx = map.direct_ptimer;
+
+	if (kvm_timer_should_fire(ctx))
+		kvm_timer_update_irq(vcpu, true, ctx);
+
+	if (userspace_irqchip(vcpu->kvm) &&
+	    !static_branch_unlikely(&has_gic_active_state))
+		disable_percpu_irq(host_vtimer_irq);
+
+	return IRQ_HANDLED;
+}
+
+static u64 kvm_counter_compute_delta(struct arch_timer_context *timer_ctx,
+				     u64 val)
+{
+	u64 now = kvm_phys_timer_read() - timer_get_offset(timer_ctx);
+
+	if (now < val) {
+		u64 ns;
+
+		ns = cyclecounter_cyc2ns(timecounter->cc,
+					 val - now,
+					 timecounter->mask,
+					 &timecounter->frac);
+		return ns;
+	}
+
+	return 0;
+}
+
+static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx)
+{
+	return kvm_counter_compute_delta(timer_ctx, timer_get_cval(timer_ctx));
+}
+
+static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
+{
+	WARN_ON(timer_ctx && timer_ctx->loaded);
+	return timer_ctx &&
+		((timer_get_ctl(timer_ctx) &
+		  (ARCH_TIMER_CTRL_IT_MASK | ARCH_TIMER_CTRL_ENABLE)) == ARCH_TIMER_CTRL_ENABLE);
+}
+
+static bool vcpu_has_wfit_active(struct kvm_vcpu *vcpu)
+{
+	return (cpus_have_final_cap(ARM64_HAS_WFXT) &&
+		vcpu_get_flag(vcpu, IN_WFIT));
+}
+
+static u64 wfit_delay_ns(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_context *ctx = vcpu_vtimer(vcpu);
+	u64 val = vcpu_get_reg(vcpu, kvm_vcpu_sys_get_rt(vcpu));
+
+	return kvm_counter_compute_delta(ctx, val);
+}
+
+/*
+ * Returns the earliest expiration time in ns among guest timers.
+ * Note that it will return 0 if none of timers can fire.
+ */
+static u64 kvm_timer_earliest_exp(struct kvm_vcpu *vcpu)
+{
+	u64 min_delta = ULLONG_MAX;
+	int i;
+
+	for (i = 0; i < NR_KVM_TIMERS; i++) {
+		struct arch_timer_context *ctx = &vcpu->arch.timer_cpu.timers[i];
+
+		WARN(ctx->loaded, "timer %d loaded\n", i);
+		if (kvm_timer_irq_can_fire(ctx))
+			min_delta = min(min_delta, kvm_timer_compute_delta(ctx));
+	}
+
+	if (vcpu_has_wfit_active(vcpu))
+		min_delta = min(min_delta, wfit_delay_ns(vcpu));
+
+	/* If none of timers can fire, then return 0 */
+	if (min_delta == ULLONG_MAX)
+		return 0;
+
+	return min_delta;
+}
+
+static enum hrtimer_restart kvm_bg_timer_expire(struct hrtimer *hrt)
+{
+	struct arch_timer_cpu *timer;
+	struct kvm_vcpu *vcpu;
+	u64 ns;
+
+	timer = container_of(hrt, struct arch_timer_cpu, bg_timer);
+	vcpu = container_of(timer, struct kvm_vcpu, arch.timer_cpu);
+
+	/*
+	 * Check that the timer has really expired from the guest's
+	 * PoV (NTP on the host may have forced it to expire
+	 * early). If we should have slept longer, restart it.
+	 */
+	ns = kvm_timer_earliest_exp(vcpu);
+	if (unlikely(ns)) {
+		hrtimer_forward_now(hrt, ns_to_ktime(ns));
+		return HRTIMER_RESTART;
+	}
+
+	kvm_vcpu_wake_up(vcpu);
+	return HRTIMER_NORESTART;
+}
+
+static enum hrtimer_restart kvm_hrtimer_expire(struct hrtimer *hrt)
+{
+	struct arch_timer_context *ctx;
+	struct kvm_vcpu *vcpu;
+	u64 ns;
+
+	ctx = container_of(hrt, struct arch_timer_context, hrtimer);
+	vcpu = ctx->vcpu;
+
+	trace_kvm_timer_hrtimer_expire(ctx);
+
+	/*
+	 * Check that the timer has really expired from the guest's
+	 * PoV (NTP on the host may have forced it to expire
+	 * early). If not ready, schedule for a later time.
+	 */
+	ns = kvm_timer_compute_delta(ctx);
+	if (unlikely(ns)) {
+		hrtimer_forward_now(hrt, ns_to_ktime(ns));
+		return HRTIMER_RESTART;
+	}
+
+	kvm_timer_update_irq(vcpu, true, ctx);
+	return HRTIMER_NORESTART;
+}
+
+static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx)
+{
+	enum kvm_arch_timers index;
+	u64 cval, now;
+
+	if (!timer_ctx)
+		return false;
+
+	index = arch_timer_ctx_index(timer_ctx);
+
+	if (timer_ctx->loaded) {
+		u32 cnt_ctl = 0;
+
+		switch (index) {
+		case TIMER_VTIMER:
+			cnt_ctl = read_sysreg_el0(SYS_CNTV_CTL);
+			break;
+		case TIMER_PTIMER:
+			cnt_ctl = read_sysreg_el0(SYS_CNTP_CTL);
+			break;
+		case NR_KVM_TIMERS:
+			/* GCC is braindead */
+			cnt_ctl = 0;
+			break;
+		}
+
+		return  (cnt_ctl & ARCH_TIMER_CTRL_ENABLE) &&
+		        (cnt_ctl & ARCH_TIMER_CTRL_IT_STAT) &&
+		       !(cnt_ctl & ARCH_TIMER_CTRL_IT_MASK);
+	}
+
+	if (!kvm_timer_irq_can_fire(timer_ctx))
+		return false;
+
+	cval = timer_get_cval(timer_ctx);
+	now = kvm_phys_timer_read() - timer_get_offset(timer_ctx);
+
+	return cval <= now;
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+	return vcpu_has_wfit_active(vcpu) && wfit_delay_ns(vcpu) == 0;
+}
+
+/*
+ * Reflect the timer output level into the kvm_run structure
+ */
+void kvm_timer_update_run(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+	struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
+	struct kvm_sync_regs *regs = &vcpu->run->s.regs;
+
+	/* Populate the device bitmap with the timer states */
+	regs->device_irq_level &= ~(KVM_ARM_DEV_EL1_VTIMER |
+				    KVM_ARM_DEV_EL1_PTIMER);
+	if (kvm_timer_should_fire(vtimer))
+		regs->device_irq_level |= KVM_ARM_DEV_EL1_VTIMER;
+	if (kvm_timer_should_fire(ptimer))
+		regs->device_irq_level |= KVM_ARM_DEV_EL1_PTIMER;
+}
+
+static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
+				 struct arch_timer_context *timer_ctx)
+{
+	int ret;
+
+	timer_ctx->irq.level = new_level;
+	trace_kvm_timer_update_irq(vcpu->vcpu_id, timer_ctx->irq.irq,
+				   timer_ctx->irq.level);
+
+	if (!userspace_irqchip(vcpu->kvm)) {
+		ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
+					  timer_ctx->irq.irq,
+					  timer_ctx->irq.level,
+					  timer_ctx);
+		WARN_ON(ret);
+	}
+}
+
+/* Only called for a fully emulated timer */
+static void timer_emulate(struct arch_timer_context *ctx)
+{
+	bool should_fire = kvm_timer_should_fire(ctx);
+
+	trace_kvm_timer_emulate(ctx, should_fire);
+
+	if (should_fire != ctx->irq.level) {
+		kvm_timer_update_irq(ctx->vcpu, should_fire, ctx);
+		return;
+	}
+
+	/*
+	 * If the timer can fire now, we don't need to have a soft timer
+	 * scheduled for the future.  If the timer cannot fire at all,
+	 * then we also don't need a soft timer.
+	 */
+	if (!kvm_timer_irq_can_fire(ctx)) {
+		soft_timer_cancel(&ctx->hrtimer);
+		return;
+	}
+
+	soft_timer_start(&ctx->hrtimer, kvm_timer_compute_delta(ctx));
+}
+
+static void timer_save_state(struct arch_timer_context *ctx)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(ctx->vcpu);
+	enum kvm_arch_timers index = arch_timer_ctx_index(ctx);
+	unsigned long flags;
+
+	if (!timer->enabled)
+		return;
+
+	local_irq_save(flags);
+
+	if (!ctx->loaded)
+		goto out;
+
+	switch (index) {
+	case TIMER_VTIMER:
+		timer_set_ctl(ctx, read_sysreg_el0(SYS_CNTV_CTL));
+		timer_set_cval(ctx, read_sysreg_el0(SYS_CNTV_CVAL));
+
+		/* Disable the timer */
+		write_sysreg_el0(0, SYS_CNTV_CTL);
+		isb();
+
+		break;
+	case TIMER_PTIMER:
+		timer_set_ctl(ctx, read_sysreg_el0(SYS_CNTP_CTL));
+		timer_set_cval(ctx, read_sysreg_el0(SYS_CNTP_CVAL));
+
+		/* Disable the timer */
+		write_sysreg_el0(0, SYS_CNTP_CTL);
+		isb();
+
+		break;
+	case NR_KVM_TIMERS:
+		BUG();
+	}
+
+	trace_kvm_timer_save_state(ctx);
+
+	ctx->loaded = false;
+out:
+	local_irq_restore(flags);
+}
+
+/*
+ * Schedule the background timer before calling kvm_vcpu_halt, so that this
+ * thread is removed from its waitqueue and made runnable when there's a timer
+ * interrupt to handle.
+ */
+static void kvm_timer_blocking(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+	struct timer_map map;
+
+	get_timer_map(vcpu, &map);
+
+	/*
+	 * If no timers are capable of raising interrupts (disabled or
+	 * masked), then there's no more work for us to do.
+	 */
+	if (!kvm_timer_irq_can_fire(map.direct_vtimer) &&
+	    !kvm_timer_irq_can_fire(map.direct_ptimer) &&
+	    !kvm_timer_irq_can_fire(map.emul_ptimer) &&
+	    !vcpu_has_wfit_active(vcpu))
+		return;
+
+	/*
+	 * At least one guest time will expire. Schedule a background timer.
+	 * Set the earliest expiration time among the guest timers.
+	 */
+	soft_timer_start(&timer->bg_timer, kvm_timer_earliest_exp(vcpu));
+}
+
+static void kvm_timer_unblocking(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+
+	soft_timer_cancel(&timer->bg_timer);
+}
+
+static void timer_restore_state(struct arch_timer_context *ctx)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(ctx->vcpu);
+	enum kvm_arch_timers index = arch_timer_ctx_index(ctx);
+	unsigned long flags;
+
+	if (!timer->enabled)
+		return;
+
+	local_irq_save(flags);
+
+	if (ctx->loaded)
+		goto out;
+
+	switch (index) {
+	case TIMER_VTIMER:
+		write_sysreg_el0(timer_get_cval(ctx), SYS_CNTV_CVAL);
+		isb();
+		write_sysreg_el0(timer_get_ctl(ctx), SYS_CNTV_CTL);
+		break;
+	case TIMER_PTIMER:
+		write_sysreg_el0(timer_get_cval(ctx), SYS_CNTP_CVAL);
+		isb();
+		write_sysreg_el0(timer_get_ctl(ctx), SYS_CNTP_CTL);
+		break;
+	case NR_KVM_TIMERS:
+		BUG();
+	}
+
+	trace_kvm_timer_restore_state(ctx);
+
+	ctx->loaded = true;
+out:
+	local_irq_restore(flags);
+}
+
+static void set_cntvoff(u64 cntvoff)
+{
+	kvm_call_hyp(__kvm_timer_set_cntvoff, cntvoff);
+}
+
+static inline void set_timer_irq_phys_active(struct arch_timer_context *ctx, bool active)
+{
+	int r;
+	r = irq_set_irqchip_state(ctx->host_timer_irq, IRQCHIP_STATE_ACTIVE, active);
+	WARN_ON(r);
+}
+
+static void kvm_timer_vcpu_load_gic(struct arch_timer_context *ctx)
+{
+	struct kvm_vcpu *vcpu = ctx->vcpu;
+	bool phys_active = false;
+
+	/*
+	 * Update the timer output so that it is likely to match the
+	 * state we're about to restore. If the timer expires between
+	 * this point and the register restoration, we'll take the
+	 * interrupt anyway.
+	 */
+	kvm_timer_update_irq(ctx->vcpu, kvm_timer_should_fire(ctx), ctx);
+
+	if (irqchip_in_kernel(vcpu->kvm))
+		phys_active = kvm_vgic_map_is_active(vcpu, ctx->irq.irq);
+
+	phys_active |= ctx->irq.level;
+
+	set_timer_irq_phys_active(ctx, phys_active);
+}
+
+static void kvm_timer_vcpu_load_nogic(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+
+	/*
+	 * Update the timer output so that it is likely to match the
+	 * state we're about to restore. If the timer expires between
+	 * this point and the register restoration, we'll take the
+	 * interrupt anyway.
+	 */
+	kvm_timer_update_irq(vcpu, kvm_timer_should_fire(vtimer), vtimer);
+
+	/*
+	 * When using a userspace irqchip with the architected timers and a
+	 * host interrupt controller that doesn't support an active state, we
+	 * must still prevent continuously exiting from the guest, and
+	 * therefore mask the physical interrupt by disabling it on the host
+	 * interrupt controller when the virtual level is high, such that the
+	 * guest can make forward progress.  Once we detect the output level
+	 * being de-asserted, we unmask the interrupt again so that we exit
+	 * from the guest when the timer fires.
+	 */
+	if (vtimer->irq.level)
+		disable_percpu_irq(host_vtimer_irq);
+	else
+		enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags);
+}
+
+void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+	struct timer_map map;
+
+	if (unlikely(!timer->enabled))
+		return;
+
+	get_timer_map(vcpu, &map);
+
+	if (static_branch_likely(&has_gic_active_state)) {
+		kvm_timer_vcpu_load_gic(map.direct_vtimer);
+		if (map.direct_ptimer)
+			kvm_timer_vcpu_load_gic(map.direct_ptimer);
+	} else {
+		kvm_timer_vcpu_load_nogic(vcpu);
+	}
+
+	set_cntvoff(timer_get_offset(map.direct_vtimer));
+
+	kvm_timer_unblocking(vcpu);
+
+	timer_restore_state(map.direct_vtimer);
+	if (map.direct_ptimer)
+		timer_restore_state(map.direct_ptimer);
+
+	if (map.emul_ptimer)
+		timer_emulate(map.emul_ptimer);
+}
+
+bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+	struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
+	struct kvm_sync_regs *sregs = &vcpu->run->s.regs;
+	bool vlevel, plevel;
+
+	if (likely(irqchip_in_kernel(vcpu->kvm)))
+		return false;
+
+	vlevel = sregs->device_irq_level & KVM_ARM_DEV_EL1_VTIMER;
+	plevel = sregs->device_irq_level & KVM_ARM_DEV_EL1_PTIMER;
+
+	return kvm_timer_should_fire(vtimer) != vlevel ||
+	       kvm_timer_should_fire(ptimer) != plevel;
+}
+
+void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+	struct timer_map map;
+
+	if (unlikely(!timer->enabled))
+		return;
+
+	get_timer_map(vcpu, &map);
+
+	timer_save_state(map.direct_vtimer);
+	if (map.direct_ptimer)
+		timer_save_state(map.direct_ptimer);
+
+	/*
+	 * Cancel soft timer emulation, because the only case where we
+	 * need it after a vcpu_put is in the context of a sleeping VCPU, and
+	 * in that case we already factor in the deadline for the physical
+	 * timer when scheduling the bg_timer.
+	 *
+	 * In any case, we re-schedule the hrtimer for the physical timer when
+	 * coming back to the VCPU thread in kvm_timer_vcpu_load().
+	 */
+	if (map.emul_ptimer)
+		soft_timer_cancel(&map.emul_ptimer->hrtimer);
+
+	if (kvm_vcpu_is_blocking(vcpu))
+		kvm_timer_blocking(vcpu);
+
+	/*
+	 * The kernel may decide to run userspace after calling vcpu_put, so
+	 * we reset cntvoff to 0 to ensure a consistent read between user
+	 * accesses to the virtual counter and kernel access to the physical
+	 * counter of non-VHE case. For VHE, the virtual counter uses a fixed
+	 * virtual offset of zero, so no need to zero CNTVOFF_EL2 register.
+	 */
+	set_cntvoff(0);
+}
+
+/*
+ * With a userspace irqchip we have to check if the guest de-asserted the
+ * timer and if so, unmask the timer irq signal on the host interrupt
+ * controller to ensure that we see future timer signals.
+ */
+static void unmask_vtimer_irq_user(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+
+	if (!kvm_timer_should_fire(vtimer)) {
+		kvm_timer_update_irq(vcpu, false, vtimer);
+		if (static_branch_likely(&has_gic_active_state))
+			set_timer_irq_phys_active(vtimer, false);
+		else
+			enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags);
+	}
+}
+
+void kvm_timer_sync_user(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+
+	if (unlikely(!timer->enabled))
+		return;
+
+	if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
+		unmask_vtimer_irq_user(vcpu);
+}
+
+int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+	struct timer_map map;
+
+	get_timer_map(vcpu, &map);
+
+	/*
+	 * The bits in CNTV_CTL are architecturally reset to UNKNOWN for ARMv8
+	 * and to 0 for ARMv7.  We provide an implementation that always
+	 * resets the timer to be disabled and unmasked and is compliant with
+	 * the ARMv7 architecture.
+	 */
+	timer_set_ctl(vcpu_vtimer(vcpu), 0);
+	timer_set_ctl(vcpu_ptimer(vcpu), 0);
+
+	if (timer->enabled) {
+		kvm_timer_update_irq(vcpu, false, vcpu_vtimer(vcpu));
+		kvm_timer_update_irq(vcpu, false, vcpu_ptimer(vcpu));
+
+		if (irqchip_in_kernel(vcpu->kvm)) {
+			kvm_vgic_reset_mapped_irq(vcpu, map.direct_vtimer->irq.irq);
+			if (map.direct_ptimer)
+				kvm_vgic_reset_mapped_irq(vcpu, map.direct_ptimer->irq.irq);
+		}
+	}
+
+	if (map.emul_ptimer)
+		soft_timer_cancel(&map.emul_ptimer->hrtimer);
+
+	return 0;
+}
+
+/* Make the updates of cntvoff for all vtimer contexts atomic */
+static void update_vtimer_cntvoff(struct kvm_vcpu *vcpu, u64 cntvoff)
+{
+	unsigned long i;
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_vcpu *tmp;
+
+	mutex_lock(&kvm->lock);
+	kvm_for_each_vcpu(i, tmp, kvm)
+		timer_set_offset(vcpu_vtimer(tmp), cntvoff);
+
+	/*
+	 * When called from the vcpu create path, the CPU being created is not
+	 * included in the loop above, so we just set it here as well.
+	 */
+	timer_set_offset(vcpu_vtimer(vcpu), cntvoff);
+	mutex_unlock(&kvm->lock);
+}
+
+void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+	struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+	struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
+
+	vtimer->vcpu = vcpu;
+	ptimer->vcpu = vcpu;
+
+	/* Synchronize cntvoff across all vtimers of a VM. */
+	update_vtimer_cntvoff(vcpu, kvm_phys_timer_read());
+	timer_set_offset(ptimer, 0);
+
+	hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
+	timer->bg_timer.function = kvm_bg_timer_expire;
+
+	hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
+	hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
+	vtimer->hrtimer.function = kvm_hrtimer_expire;
+	ptimer->hrtimer.function = kvm_hrtimer_expire;
+
+	vtimer->irq.irq = default_vtimer_irq.irq;
+	ptimer->irq.irq = default_ptimer_irq.irq;
+
+	vtimer->host_timer_irq = host_vtimer_irq;
+	ptimer->host_timer_irq = host_ptimer_irq;
+
+	vtimer->host_timer_irq_flags = host_vtimer_irq_flags;
+	ptimer->host_timer_irq_flags = host_ptimer_irq_flags;
+}
+
+static void kvm_timer_init_interrupt(void *info)
+{
+	enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags);
+	enable_percpu_irq(host_ptimer_irq, host_ptimer_irq_flags);
+}
+
+int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
+{
+	struct arch_timer_context *timer;
+
+	switch (regid) {
+	case KVM_REG_ARM_TIMER_CTL:
+		timer = vcpu_vtimer(vcpu);
+		kvm_arm_timer_write(vcpu, timer, TIMER_REG_CTL, value);
+		break;
+	case KVM_REG_ARM_TIMER_CNT:
+		timer = vcpu_vtimer(vcpu);
+		update_vtimer_cntvoff(vcpu, kvm_phys_timer_read() - value);
+		break;
+	case KVM_REG_ARM_TIMER_CVAL:
+		timer = vcpu_vtimer(vcpu);
+		kvm_arm_timer_write(vcpu, timer, TIMER_REG_CVAL, value);
+		break;
+	case KVM_REG_ARM_PTIMER_CTL:
+		timer = vcpu_ptimer(vcpu);
+		kvm_arm_timer_write(vcpu, timer, TIMER_REG_CTL, value);
+		break;
+	case KVM_REG_ARM_PTIMER_CVAL:
+		timer = vcpu_ptimer(vcpu);
+		kvm_arm_timer_write(vcpu, timer, TIMER_REG_CVAL, value);
+		break;
+
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
+static u64 read_timer_ctl(struct arch_timer_context *timer)
+{
+	/*
+	 * Set ISTATUS bit if it's expired.
+	 * Note that according to ARMv8 ARM Issue A.k, ISTATUS bit is
+	 * UNKNOWN when ENABLE bit is 0, so we chose to set ISTATUS bit
+	 * regardless of ENABLE bit for our implementation convenience.
+	 */
+	u32 ctl = timer_get_ctl(timer);
+
+	if (!kvm_timer_compute_delta(timer))
+		ctl |= ARCH_TIMER_CTRL_IT_STAT;
+
+	return ctl;
+}
+
+u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
+{
+	switch (regid) {
+	case KVM_REG_ARM_TIMER_CTL:
+		return kvm_arm_timer_read(vcpu,
+					  vcpu_vtimer(vcpu), TIMER_REG_CTL);
+	case KVM_REG_ARM_TIMER_CNT:
+		return kvm_arm_timer_read(vcpu,
+					  vcpu_vtimer(vcpu), TIMER_REG_CNT);
+	case KVM_REG_ARM_TIMER_CVAL:
+		return kvm_arm_timer_read(vcpu,
+					  vcpu_vtimer(vcpu), TIMER_REG_CVAL);
+	case KVM_REG_ARM_PTIMER_CTL:
+		return kvm_arm_timer_read(vcpu,
+					  vcpu_ptimer(vcpu), TIMER_REG_CTL);
+	case KVM_REG_ARM_PTIMER_CNT:
+		return kvm_arm_timer_read(vcpu,
+					  vcpu_ptimer(vcpu), TIMER_REG_CNT);
+	case KVM_REG_ARM_PTIMER_CVAL:
+		return kvm_arm_timer_read(vcpu,
+					  vcpu_ptimer(vcpu), TIMER_REG_CVAL);
+	}
+	return (u64)-1;
+}
+
+static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
+			      struct arch_timer_context *timer,
+			      enum kvm_arch_timer_regs treg)
+{
+	u64 val;
+
+	switch (treg) {
+	case TIMER_REG_TVAL:
+		val = timer_get_cval(timer) - kvm_phys_timer_read() + timer_get_offset(timer);
+		val = lower_32_bits(val);
+		break;
+
+	case TIMER_REG_CTL:
+		val = read_timer_ctl(timer);
+		break;
+
+	case TIMER_REG_CVAL:
+		val = timer_get_cval(timer);
+		break;
+
+	case TIMER_REG_CNT:
+		val = kvm_phys_timer_read() - timer_get_offset(timer);
+		break;
+
+	default:
+		BUG();
+	}
+
+	return val;
+}
+
+u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
+			      enum kvm_arch_timers tmr,
+			      enum kvm_arch_timer_regs treg)
+{
+	u64 val;
+
+	preempt_disable();
+	kvm_timer_vcpu_put(vcpu);
+
+	val = kvm_arm_timer_read(vcpu, vcpu_get_timer(vcpu, tmr), treg);
+
+	kvm_timer_vcpu_load(vcpu);
+	preempt_enable();
+
+	return val;
+}
+
+static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
+				struct arch_timer_context *timer,
+				enum kvm_arch_timer_regs treg,
+				u64 val)
+{
+	switch (treg) {
+	case TIMER_REG_TVAL:
+		timer_set_cval(timer, kvm_phys_timer_read() - timer_get_offset(timer) + (s32)val);
+		break;
+
+	case TIMER_REG_CTL:
+		timer_set_ctl(timer, val & ~ARCH_TIMER_CTRL_IT_STAT);
+		break;
+
+	case TIMER_REG_CVAL:
+		timer_set_cval(timer, val);
+		break;
+
+	default:
+		BUG();
+	}
+}
+
+void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
+				enum kvm_arch_timers tmr,
+				enum kvm_arch_timer_regs treg,
+				u64 val)
+{
+	preempt_disable();
+	kvm_timer_vcpu_put(vcpu);
+
+	kvm_arm_timer_write(vcpu, vcpu_get_timer(vcpu, tmr), treg, val);
+
+	kvm_timer_vcpu_load(vcpu);
+	preempt_enable();
+}
+
+static int kvm_timer_starting_cpu(unsigned int cpu)
+{
+	kvm_timer_init_interrupt(NULL);
+	return 0;
+}
+
+static int kvm_timer_dying_cpu(unsigned int cpu)
+{
+	disable_percpu_irq(host_vtimer_irq);
+	return 0;
+}
+
+static int timer_irq_set_vcpu_affinity(struct irq_data *d, void *vcpu)
+{
+	if (vcpu)
+		irqd_set_forwarded_to_vcpu(d);
+	else
+		irqd_clr_forwarded_to_vcpu(d);
+
+	return 0;
+}
+
+static int timer_irq_set_irqchip_state(struct irq_data *d,
+				       enum irqchip_irq_state which, bool val)
+{
+	if (which != IRQCHIP_STATE_ACTIVE || !irqd_is_forwarded_to_vcpu(d))
+		return irq_chip_set_parent_state(d, which, val);
+
+	if (val)
+		irq_chip_mask_parent(d);
+	else
+		irq_chip_unmask_parent(d);
+
+	return 0;
+}
+
+static void timer_irq_eoi(struct irq_data *d)
+{
+	if (!irqd_is_forwarded_to_vcpu(d))
+		irq_chip_eoi_parent(d);
+}
+
+static void timer_irq_ack(struct irq_data *d)
+{
+	d = d->parent_data;
+	if (d->chip->irq_ack)
+		d->chip->irq_ack(d);
+}
+
+static struct irq_chip timer_chip = {
+	.name			= "KVM",
+	.irq_ack		= timer_irq_ack,
+	.irq_mask		= irq_chip_mask_parent,
+	.irq_unmask		= irq_chip_unmask_parent,
+	.irq_eoi		= timer_irq_eoi,
+	.irq_set_type		= irq_chip_set_type_parent,
+	.irq_set_vcpu_affinity	= timer_irq_set_vcpu_affinity,
+	.irq_set_irqchip_state	= timer_irq_set_irqchip_state,
+};
+
+static int timer_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs, void *arg)
+{
+	irq_hw_number_t hwirq = (uintptr_t)arg;
+
+	return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+					     &timer_chip, NULL);
+}
+
+static void timer_irq_domain_free(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs)
+{
+}
+
+static const struct irq_domain_ops timer_domain_ops = {
+	.alloc	= timer_irq_domain_alloc,
+	.free	= timer_irq_domain_free,
+};
+
+static struct irq_ops arch_timer_irq_ops = {
+	.get_input_level = kvm_arch_timer_get_input_level,
+};
+
+static void kvm_irq_fixup_flags(unsigned int virq, u32 *flags)
+{
+	*flags = irq_get_trigger_type(virq);
+	if (*flags != IRQF_TRIGGER_HIGH && *flags != IRQF_TRIGGER_LOW) {
+		kvm_err("Invalid trigger for timer IRQ%d, assuming level low\n",
+			virq);
+		*flags = IRQF_TRIGGER_LOW;
+	}
+}
+
+static int kvm_irq_init(struct arch_timer_kvm_info *info)
+{
+	struct irq_domain *domain = NULL;
+
+	if (info->virtual_irq <= 0) {
+		kvm_err("kvm_arch_timer: invalid virtual timer IRQ: %d\n",
+			info->virtual_irq);
+		return -ENODEV;
+	}
+
+	host_vtimer_irq = info->virtual_irq;
+	kvm_irq_fixup_flags(host_vtimer_irq, &host_vtimer_irq_flags);
+
+	if (kvm_vgic_global_state.no_hw_deactivation) {
+		struct fwnode_handle *fwnode;
+		struct irq_data *data;
+
+		fwnode = irq_domain_alloc_named_fwnode("kvm-timer");
+		if (!fwnode)
+			return -ENOMEM;
+
+		/* Assume both vtimer and ptimer in the same parent */
+		data = irq_get_irq_data(host_vtimer_irq);
+		domain = irq_domain_create_hierarchy(data->domain, 0,
+						     NR_KVM_TIMERS, fwnode,
+						     &timer_domain_ops, NULL);
+		if (!domain) {
+			irq_domain_free_fwnode(fwnode);
+			return -ENOMEM;
+		}
+
+		arch_timer_irq_ops.flags |= VGIC_IRQ_SW_RESAMPLE;
+		WARN_ON(irq_domain_push_irq(domain, host_vtimer_irq,
+					    (void *)TIMER_VTIMER));
+	}
+
+	if (info->physical_irq > 0) {
+		host_ptimer_irq = info->physical_irq;
+		kvm_irq_fixup_flags(host_ptimer_irq, &host_ptimer_irq_flags);
+
+		if (domain)
+			WARN_ON(irq_domain_push_irq(domain, host_ptimer_irq,
+						    (void *)TIMER_PTIMER));
+	}
+
+	return 0;
+}
+
+int kvm_timer_hyp_init(bool has_gic)
+{
+	struct arch_timer_kvm_info *info;
+	int err;
+
+	info = arch_timer_get_kvm_info();
+	timecounter = &info->timecounter;
+
+	if (!timecounter->cc) {
+		kvm_err("kvm_arch_timer: uninitialized timecounter\n");
+		return -ENODEV;
+	}
+
+	err = kvm_irq_init(info);
+	if (err)
+		return err;
+
+	/* First, do the virtual EL1 timer irq */
+
+	err = request_percpu_irq(host_vtimer_irq, kvm_arch_timer_handler,
+				 "kvm guest vtimer", kvm_get_running_vcpus());
+	if (err) {
+		kvm_err("kvm_arch_timer: can't request vtimer interrupt %d (%d)\n",
+			host_vtimer_irq, err);
+		return err;
+	}
+
+	if (has_gic) {
+		err = irq_set_vcpu_affinity(host_vtimer_irq,
+					    kvm_get_running_vcpus());
+		if (err) {
+			kvm_err("kvm_arch_timer: error setting vcpu affinity\n");
+			goto out_free_irq;
+		}
+
+		static_branch_enable(&has_gic_active_state);
+	}
+
+	kvm_debug("virtual timer IRQ%d\n", host_vtimer_irq);
+
+	/* Now let's do the physical EL1 timer irq */
+
+	if (info->physical_irq > 0) {
+		err = request_percpu_irq(host_ptimer_irq, kvm_arch_timer_handler,
+					 "kvm guest ptimer", kvm_get_running_vcpus());
+		if (err) {
+			kvm_err("kvm_arch_timer: can't request ptimer interrupt %d (%d)\n",
+				host_ptimer_irq, err);
+			return err;
+		}
+
+		if (has_gic) {
+			err = irq_set_vcpu_affinity(host_ptimer_irq,
+						    kvm_get_running_vcpus());
+			if (err) {
+				kvm_err("kvm_arch_timer: error setting vcpu affinity\n");
+				goto out_free_irq;
+			}
+		}
+
+		kvm_debug("physical timer IRQ%d\n", host_ptimer_irq);
+	} else if (has_vhe()) {
+		kvm_err("kvm_arch_timer: invalid physical timer IRQ: %d\n",
+			info->physical_irq);
+		err = -ENODEV;
+		goto out_free_irq;
+	}
+
+	cpuhp_setup_state(CPUHP_AP_KVM_ARM_TIMER_STARTING,
+			  "kvm/arm/timer:starting", kvm_timer_starting_cpu,
+			  kvm_timer_dying_cpu);
+	return 0;
+out_free_irq:
+	free_percpu_irq(host_vtimer_irq, kvm_get_running_vcpus());
+	return err;
+}
+
+void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+
+	soft_timer_cancel(&timer->bg_timer);
+}
+
+static bool timer_irqs_are_valid(struct kvm_vcpu *vcpu)
+{
+	int vtimer_irq, ptimer_irq, ret;
+	unsigned long i;
+
+	vtimer_irq = vcpu_vtimer(vcpu)->irq.irq;
+	ret = kvm_vgic_set_owner(vcpu, vtimer_irq, vcpu_vtimer(vcpu));
+	if (ret)
+		return false;
+
+	ptimer_irq = vcpu_ptimer(vcpu)->irq.irq;
+	ret = kvm_vgic_set_owner(vcpu, ptimer_irq, vcpu_ptimer(vcpu));
+	if (ret)
+		return false;
+
+	kvm_for_each_vcpu(i, vcpu, vcpu->kvm) {
+		if (vcpu_vtimer(vcpu)->irq.irq != vtimer_irq ||
+		    vcpu_ptimer(vcpu)->irq.irq != ptimer_irq)
+			return false;
+	}
+
+	return true;
+}
+
+bool kvm_arch_timer_get_input_level(int vintid)
+{
+	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
+	struct arch_timer_context *timer;
+
+	if (WARN(!vcpu, "No vcpu context!\n"))
+		return false;
+
+	if (vintid == vcpu_vtimer(vcpu)->irq.irq)
+		timer = vcpu_vtimer(vcpu);
+	else if (vintid == vcpu_ptimer(vcpu)->irq.irq)
+		timer = vcpu_ptimer(vcpu);
+	else
+		BUG();
+
+	return kvm_timer_should_fire(timer);
+}
+
+int kvm_timer_enable(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
+	struct timer_map map;
+	int ret;
+
+	if (timer->enabled)
+		return 0;
+
+	/* Without a VGIC we do not map virtual IRQs to physical IRQs */
+	if (!irqchip_in_kernel(vcpu->kvm))
+		goto no_vgic;
+
+	/*
+	 * At this stage, we have the guarantee that the vgic is both
+	 * available and initialized.
+	 */
+	if (!timer_irqs_are_valid(vcpu)) {
+		kvm_debug("incorrectly configured timer irqs\n");
+		return -EINVAL;
+	}
+
+	get_timer_map(vcpu, &map);
+
+	ret = kvm_vgic_map_phys_irq(vcpu,
+				    map.direct_vtimer->host_timer_irq,
+				    map.direct_vtimer->irq.irq,
+				    &arch_timer_irq_ops);
+	if (ret)
+		return ret;
+
+	if (map.direct_ptimer) {
+		ret = kvm_vgic_map_phys_irq(vcpu,
+					    map.direct_ptimer->host_timer_irq,
+					    map.direct_ptimer->irq.irq,
+					    &arch_timer_irq_ops);
+	}
+
+	if (ret)
+		return ret;
+
+no_vgic:
+	timer->enabled = 1;
+	return 0;
+}
+
+/*
+ * On VHE system, we only need to configure the EL2 timer trap register once,
+ * not for every world switch.
+ * The host kernel runs at EL2 with HCR_EL2.TGE == 1,
+ * and this makes those bits have no effect for the host kernel execution.
+ */
+void kvm_timer_init_vhe(void)
+{
+	/* When HCR_EL2.E2H ==1, EL1PCEN and EL1PCTEN are shifted by 10 */
+	u32 cnthctl_shift = 10;
+	u64 val;
+
+	/*
+	 * VHE systems allow the guest direct access to the EL1 physical
+	 * timer/counter.
+	 */
+	val = read_sysreg(cnthctl_el2);
+	val |= (CNTHCTL_EL1PCEN << cnthctl_shift);
+	val |= (CNTHCTL_EL1PCTEN << cnthctl_shift);
+	write_sysreg(val, cnthctl_el2);
+}
+
+static void set_timer_irqs(struct kvm *kvm, int vtimer_irq, int ptimer_irq)
+{
+	struct kvm_vcpu *vcpu;
+	unsigned long i;
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		vcpu_vtimer(vcpu)->irq.irq = vtimer_irq;
+		vcpu_ptimer(vcpu)->irq.irq = ptimer_irq;
+	}
+}
+
+int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+	int __user *uaddr = (int __user *)(long)attr->addr;
+	struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+	struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
+	int irq;
+
+	if (!irqchip_in_kernel(vcpu->kvm))
+		return -EINVAL;
+
+	if (get_user(irq, uaddr))
+		return -EFAULT;
+
+	if (!(irq_is_ppi(irq)))
+		return -EINVAL;
+
+	if (vcpu->arch.timer_cpu.enabled)
+		return -EBUSY;
+
+	switch (attr->attr) {
+	case KVM_ARM_VCPU_TIMER_IRQ_VTIMER:
+		set_timer_irqs(vcpu->kvm, irq, ptimer->irq.irq);
+		break;
+	case KVM_ARM_VCPU_TIMER_IRQ_PTIMER:
+		set_timer_irqs(vcpu->kvm, vtimer->irq.irq, irq);
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+	int __user *uaddr = (int __user *)(long)attr->addr;
+	struct arch_timer_context *timer;
+	int irq;
+
+	switch (attr->attr) {
+	case KVM_ARM_VCPU_TIMER_IRQ_VTIMER:
+		timer = vcpu_vtimer(vcpu);
+		break;
+	case KVM_ARM_VCPU_TIMER_IRQ_PTIMER:
+		timer = vcpu_ptimer(vcpu);
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	irq = timer->irq.irq;
+	return put_user(irq, uaddr);
+}
+
+int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+	switch (attr->attr) {
+	case KVM_ARM_VCPU_TIMER_IRQ_VTIMER:
+	case KVM_ARM_VCPU_TIMER_IRQ_PTIMER:
+		return 0;
+	}
+
+	return -ENXIO;
+}
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
new file mode 100644
index 000000000..de94515fb
--- /dev/null
+++ b/arch/arm64/kvm/arm.c
@@ -0,0 +1,2371 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/bug.h>
+#include <linux/cpu_pm.h>
+#include <linux/entry-kvm.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/mman.h>
+#include <linux/sched.h>
+#include <linux/kmemleak.h>
+#include <linux/kvm.h>
+#include <linux/kvm_irqfd.h>
+#include <linux/irqbypass.h>
+#include <linux/sched/stat.h>
+#include <linux/psci.h>
+#include <trace/events/kvm.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace_arm.h"
+
+#include <linux/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/mman.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/cpufeature.h>
+#include <asm/virt.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_emulate.h>
+#include <asm/sections.h>
+
+#include <kvm/arm_hypercalls.h>
+#include <kvm/arm_pmu.h>
+#include <kvm/arm_psci.h>
+
+static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT;
+DEFINE_STATIC_KEY_FALSE(kvm_protected_mode_initialized);
+
+DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector);
+
+DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
+unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
+DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
+
+static bool vgic_present;
+
+static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
+DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
+
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+	return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
+}
+
+int kvm_arch_hardware_setup(void *opaque)
+{
+	return 0;
+}
+
+int kvm_arch_check_processor_compat(void *opaque)
+{
+	return 0;
+}
+
+int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
+			    struct kvm_enable_cap *cap)
+{
+	int r;
+
+	if (cap->flags)
+		return -EINVAL;
+
+	switch (cap->cap) {
+	case KVM_CAP_ARM_NISV_TO_USER:
+		r = 0;
+		set_bit(KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER,
+			&kvm->arch.flags);
+		break;
+	case KVM_CAP_ARM_MTE:
+		mutex_lock(&kvm->lock);
+		if (!system_supports_mte() || kvm->created_vcpus) {
+			r = -EINVAL;
+		} else {
+			r = 0;
+			set_bit(KVM_ARCH_FLAG_MTE_ENABLED, &kvm->arch.flags);
+		}
+		mutex_unlock(&kvm->lock);
+		break;
+	case KVM_CAP_ARM_SYSTEM_SUSPEND:
+		r = 0;
+		set_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags);
+		break;
+	default:
+		r = -EINVAL;
+		break;
+	}
+
+	return r;
+}
+
+static int kvm_arm_default_max_vcpus(void)
+{
+	return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
+}
+
+static void set_default_spectre(struct kvm *kvm)
+{
+	/*
+	 * The default is to expose CSV2 == 1 if the HW isn't affected.
+	 * Although this is a per-CPU feature, we make it global because
+	 * asymmetric systems are just a nuisance.
+	 *
+	 * Userspace can override this as long as it doesn't promise
+	 * the impossible.
+	 */
+	if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
+		kvm->arch.pfr0_csv2 = 1;
+	if (arm64_get_meltdown_state() == SPECTRE_UNAFFECTED)
+		kvm->arch.pfr0_csv3 = 1;
+}
+
+/**
+ * kvm_arch_init_vm - initializes a VM data structure
+ * @kvm:	pointer to the KVM struct
+ */
+int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
+{
+	int ret;
+
+	ret = kvm_arm_setup_stage2(kvm, type);
+	if (ret)
+		return ret;
+
+	ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu);
+	if (ret)
+		return ret;
+
+	mutex_init(&kvm->arch.config_lock);
+
+#ifdef CONFIG_LOCKDEP
+	/* Clue in lockdep that the config_lock must be taken inside kvm->lock */
+	mutex_lock(&kvm->lock);
+	mutex_lock(&kvm->arch.config_lock);
+	mutex_unlock(&kvm->arch.config_lock);
+	mutex_unlock(&kvm->lock);
+#endif
+
+	ret = kvm_share_hyp(kvm, kvm + 1);
+	if (ret)
+		goto out_free_stage2_pgd;
+
+	if (!zalloc_cpumask_var(&kvm->arch.supported_cpus, GFP_KERNEL)) {
+		ret = -ENOMEM;
+		goto out_free_stage2_pgd;
+	}
+	cpumask_copy(kvm->arch.supported_cpus, cpu_possible_mask);
+
+	kvm_vgic_early_init(kvm);
+
+	/* The maximum number of VCPUs is limited by the host's GIC model */
+	kvm->max_vcpus = kvm_arm_default_max_vcpus();
+
+	set_default_spectre(kvm);
+	kvm_arm_init_hypercalls(kvm);
+
+	return ret;
+out_free_stage2_pgd:
+	kvm_free_stage2_pgd(&kvm->arch.mmu);
+	return ret;
+}
+
+vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+{
+	return VM_FAULT_SIGBUS;
+}
+
+
+/**
+ * kvm_arch_destroy_vm - destroy the VM data structure
+ * @kvm:	pointer to the KVM struct
+ */
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+	bitmap_free(kvm->arch.pmu_filter);
+	free_cpumask_var(kvm->arch.supported_cpus);
+
+	kvm_vgic_destroy(kvm);
+
+	kvm_destroy_vcpus(kvm);
+
+	kvm_unshare_hyp(kvm, kvm + 1);
+}
+
+int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
+{
+	int r;
+	switch (ext) {
+	case KVM_CAP_IRQCHIP:
+		r = vgic_present;
+		break;
+	case KVM_CAP_IOEVENTFD:
+	case KVM_CAP_DEVICE_CTRL:
+	case KVM_CAP_USER_MEMORY:
+	case KVM_CAP_SYNC_MMU:
+	case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
+	case KVM_CAP_ONE_REG:
+	case KVM_CAP_ARM_PSCI:
+	case KVM_CAP_ARM_PSCI_0_2:
+	case KVM_CAP_READONLY_MEM:
+	case KVM_CAP_MP_STATE:
+	case KVM_CAP_IMMEDIATE_EXIT:
+	case KVM_CAP_VCPU_EVENTS:
+	case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
+	case KVM_CAP_ARM_NISV_TO_USER:
+	case KVM_CAP_ARM_INJECT_EXT_DABT:
+	case KVM_CAP_SET_GUEST_DEBUG:
+	case KVM_CAP_VCPU_ATTRIBUTES:
+	case KVM_CAP_PTP_KVM:
+	case KVM_CAP_ARM_SYSTEM_SUSPEND:
+		r = 1;
+		break;
+	case KVM_CAP_SET_GUEST_DEBUG2:
+		return KVM_GUESTDBG_VALID_MASK;
+	case KVM_CAP_ARM_SET_DEVICE_ADDR:
+		r = 1;
+		break;
+	case KVM_CAP_NR_VCPUS:
+		/*
+		 * ARM64 treats KVM_CAP_NR_CPUS differently from all other
+		 * architectures, as it does not always bound it to
+		 * KVM_CAP_MAX_VCPUS. It should not matter much because
+		 * this is just an advisory value.
+		 */
+		r = min_t(unsigned int, num_online_cpus(),
+			  kvm_arm_default_max_vcpus());
+		break;
+	case KVM_CAP_MAX_VCPUS:
+	case KVM_CAP_MAX_VCPU_ID:
+		if (kvm)
+			r = kvm->max_vcpus;
+		else
+			r = kvm_arm_default_max_vcpus();
+		break;
+	case KVM_CAP_MSI_DEVID:
+		if (!kvm)
+			r = -EINVAL;
+		else
+			r = kvm->arch.vgic.msis_require_devid;
+		break;
+	case KVM_CAP_ARM_USER_IRQ:
+		/*
+		 * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
+		 * (bump this number if adding more devices)
+		 */
+		r = 1;
+		break;
+	case KVM_CAP_ARM_MTE:
+		r = system_supports_mte();
+		break;
+	case KVM_CAP_STEAL_TIME:
+		r = kvm_arm_pvtime_supported();
+		break;
+	case KVM_CAP_ARM_EL1_32BIT:
+		r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1);
+		break;
+	case KVM_CAP_GUEST_DEBUG_HW_BPS:
+		r = get_num_brps();
+		break;
+	case KVM_CAP_GUEST_DEBUG_HW_WPS:
+		r = get_num_wrps();
+		break;
+	case KVM_CAP_ARM_PMU_V3:
+		r = kvm_arm_support_pmu_v3();
+		break;
+	case KVM_CAP_ARM_INJECT_SERROR_ESR:
+		r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
+		break;
+	case KVM_CAP_ARM_VM_IPA_SIZE:
+		r = get_kvm_ipa_limit();
+		break;
+	case KVM_CAP_ARM_SVE:
+		r = system_supports_sve();
+		break;
+	case KVM_CAP_ARM_PTRAUTH_ADDRESS:
+	case KVM_CAP_ARM_PTRAUTH_GENERIC:
+		r = system_has_full_ptr_auth();
+		break;
+	default:
+		r = 0;
+	}
+
+	return r;
+}
+
+long kvm_arch_dev_ioctl(struct file *filp,
+			unsigned int ioctl, unsigned long arg)
+{
+	return -EINVAL;
+}
+
+struct kvm *kvm_arch_alloc_vm(void)
+{
+	size_t sz = sizeof(struct kvm);
+
+	if (!has_vhe())
+		return kzalloc(sz, GFP_KERNEL_ACCOUNT);
+
+	return __vmalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_HIGHMEM | __GFP_ZERO);
+}
+
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+	if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
+		return -EBUSY;
+
+	if (id >= kvm->max_vcpus)
+		return -EINVAL;
+
+	return 0;
+}
+
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
+{
+	int err;
+
+	spin_lock_init(&vcpu->arch.mp_state_lock);
+
+#ifdef CONFIG_LOCKDEP
+	/* Inform lockdep that the config_lock is acquired after vcpu->mutex */
+	mutex_lock(&vcpu->mutex);
+	mutex_lock(&vcpu->kvm->arch.config_lock);
+	mutex_unlock(&vcpu->kvm->arch.config_lock);
+	mutex_unlock(&vcpu->mutex);
+#endif
+
+	/* Force users to call KVM_ARM_VCPU_INIT */
+	vcpu->arch.target = -1;
+	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
+
+	vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
+
+	/*
+	 * Default value for the FP state, will be overloaded at load
+	 * time if we support FP (pretty likely)
+	 */
+	vcpu->arch.fp_state = FP_STATE_FREE;
+
+	/* Set up the timer */
+	kvm_timer_vcpu_init(vcpu);
+
+	kvm_pmu_vcpu_init(vcpu);
+
+	kvm_arm_reset_debug_ptr(vcpu);
+
+	kvm_arm_pvtime_vcpu_init(&vcpu->arch);
+
+	vcpu->arch.hw_mmu = &vcpu->kvm->arch.mmu;
+
+	err = kvm_vgic_vcpu_init(vcpu);
+	if (err)
+		return err;
+
+	return kvm_share_hyp(vcpu, vcpu + 1);
+}
+
+void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+{
+}
+
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_has_run_once(vcpu) && unlikely(!irqchip_in_kernel(vcpu->kvm)))
+		static_branch_dec(&userspace_irqchip_in_use);
+
+	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
+	kvm_timer_vcpu_terminate(vcpu);
+	kvm_pmu_vcpu_destroy(vcpu);
+	kvm_vgic_vcpu_destroy(vcpu);
+	kvm_arm_vcpu_destroy(vcpu);
+}
+
+void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
+{
+
+}
+
+void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
+{
+
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+	struct kvm_s2_mmu *mmu;
+	int *last_ran;
+
+	mmu = vcpu->arch.hw_mmu;
+	last_ran = this_cpu_ptr(mmu->last_vcpu_ran);
+
+	/*
+	 * We guarantee that both TLBs and I-cache are private to each
+	 * vcpu. If detecting that a vcpu from the same VM has
+	 * previously run on the same physical CPU, call into the
+	 * hypervisor code to nuke the relevant contexts.
+	 *
+	 * We might get preempted before the vCPU actually runs, but
+	 * over-invalidation doesn't affect correctness.
+	 */
+	if (*last_ran != vcpu->vcpu_id) {
+		kvm_call_hyp(__kvm_flush_cpu_context, mmu);
+		*last_ran = vcpu->vcpu_id;
+	}
+
+	vcpu->cpu = cpu;
+
+	kvm_vgic_load(vcpu);
+	kvm_timer_vcpu_load(vcpu);
+	if (has_vhe())
+		kvm_vcpu_load_sysregs_vhe(vcpu);
+	kvm_arch_vcpu_load_fp(vcpu);
+	kvm_vcpu_pmu_restore_guest(vcpu);
+	if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
+		kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
+
+	if (single_task_running())
+		vcpu_clear_wfx_traps(vcpu);
+	else
+		vcpu_set_wfx_traps(vcpu);
+
+	if (vcpu_has_ptrauth(vcpu))
+		vcpu_ptrauth_disable(vcpu);
+	kvm_arch_vcpu_load_debug_state_flags(vcpu);
+
+	if (!cpumask_test_cpu(smp_processor_id(), vcpu->kvm->arch.supported_cpus))
+		vcpu_set_on_unsupported_cpu(vcpu);
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+	kvm_arch_vcpu_put_debug_state_flags(vcpu);
+	kvm_arch_vcpu_put_fp(vcpu);
+	if (has_vhe())
+		kvm_vcpu_put_sysregs_vhe(vcpu);
+	kvm_timer_vcpu_put(vcpu);
+	kvm_vgic_put(vcpu);
+	kvm_vcpu_pmu_restore_host(vcpu);
+	kvm_arm_vmid_clear_active();
+
+	vcpu_clear_on_unsupported_cpu(vcpu);
+	vcpu->cpu = -1;
+}
+
+static void __kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
+{
+	WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_STOPPED);
+	kvm_make_request(KVM_REQ_SLEEP, vcpu);
+	kvm_vcpu_kick(vcpu);
+}
+
+void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
+{
+	spin_lock(&vcpu->arch.mp_state_lock);
+	__kvm_arm_vcpu_power_off(vcpu);
+	spin_unlock(&vcpu->arch.mp_state_lock);
+}
+
+bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu)
+{
+	return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_STOPPED;
+}
+
+static void kvm_arm_vcpu_suspend(struct kvm_vcpu *vcpu)
+{
+	WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_SUSPENDED);
+	kvm_make_request(KVM_REQ_SUSPEND, vcpu);
+	kvm_vcpu_kick(vcpu);
+}
+
+static bool kvm_arm_vcpu_suspended(struct kvm_vcpu *vcpu)
+{
+	return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_SUSPENDED;
+}
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+				    struct kvm_mp_state *mp_state)
+{
+	*mp_state = READ_ONCE(vcpu->arch.mp_state);
+
+	return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+				    struct kvm_mp_state *mp_state)
+{
+	int ret = 0;
+
+	spin_lock(&vcpu->arch.mp_state_lock);
+
+	switch (mp_state->mp_state) {
+	case KVM_MP_STATE_RUNNABLE:
+		WRITE_ONCE(vcpu->arch.mp_state, *mp_state);
+		break;
+	case KVM_MP_STATE_STOPPED:
+		__kvm_arm_vcpu_power_off(vcpu);
+		break;
+	case KVM_MP_STATE_SUSPENDED:
+		kvm_arm_vcpu_suspend(vcpu);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	spin_unlock(&vcpu->arch.mp_state_lock);
+
+	return ret;
+}
+
+/**
+ * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
+ * @v:		The VCPU pointer
+ *
+ * If the guest CPU is not waiting for interrupts or an interrupt line is
+ * asserted, the CPU is by definition runnable.
+ */
+int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
+{
+	bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
+	return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
+		&& !kvm_arm_vcpu_stopped(v) && !v->arch.pause);
+}
+
+bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
+{
+	return vcpu_mode_priv(vcpu);
+}
+
+#ifdef CONFIG_GUEST_PERF_EVENTS
+unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
+{
+	return *vcpu_pc(vcpu);
+}
+#endif
+
+static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
+{
+	return vcpu->arch.target >= 0;
+}
+
+/*
+ * Handle both the initialisation that is being done when the vcpu is
+ * run for the first time, as well as the updates that must be
+ * performed each time we get a new thread dealing with this vcpu.
+ */
+int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	int ret;
+
+	if (!kvm_vcpu_initialized(vcpu))
+		return -ENOEXEC;
+
+	if (!kvm_arm_vcpu_is_finalized(vcpu))
+		return -EPERM;
+
+	ret = kvm_arch_vcpu_run_map_fp(vcpu);
+	if (ret)
+		return ret;
+
+	if (likely(vcpu_has_run_once(vcpu)))
+		return 0;
+
+	kvm_arm_vcpu_init_debug(vcpu);
+
+	if (likely(irqchip_in_kernel(kvm))) {
+		/*
+		 * Map the VGIC hardware resources before running a vcpu the
+		 * first time on this VM.
+		 */
+		ret = kvm_vgic_map_resources(kvm);
+		if (ret)
+			return ret;
+	}
+
+	ret = kvm_timer_enable(vcpu);
+	if (ret)
+		return ret;
+
+	ret = kvm_arm_pmu_v3_enable(vcpu);
+	if (ret)
+		return ret;
+
+	if (!irqchip_in_kernel(kvm)) {
+		/*
+		 * Tell the rest of the code that there are userspace irqchip
+		 * VMs in the wild.
+		 */
+		static_branch_inc(&userspace_irqchip_in_use);
+	}
+
+	/*
+	 * Initialize traps for protected VMs.
+	 * NOTE: Move to run in EL2 directly, rather than via a hypercall, once
+	 * the code is in place for first run initialization at EL2.
+	 */
+	if (kvm_vm_is_protected(kvm))
+		kvm_call_hyp_nvhe(__pkvm_vcpu_init_traps, vcpu);
+
+	mutex_lock(&kvm->arch.config_lock);
+	set_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags);
+	mutex_unlock(&kvm->arch.config_lock);
+
+	return ret;
+}
+
+bool kvm_arch_intc_initialized(struct kvm *kvm)
+{
+	return vgic_initialized(kvm);
+}
+
+void kvm_arm_halt_guest(struct kvm *kvm)
+{
+	unsigned long i;
+	struct kvm_vcpu *vcpu;
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		vcpu->arch.pause = true;
+	kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP);
+}
+
+void kvm_arm_resume_guest(struct kvm *kvm)
+{
+	unsigned long i;
+	struct kvm_vcpu *vcpu;
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		vcpu->arch.pause = false;
+		__kvm_vcpu_wake_up(vcpu);
+	}
+}
+
+static void kvm_vcpu_sleep(struct kvm_vcpu *vcpu)
+{
+	struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
+
+	rcuwait_wait_event(wait,
+			   (!kvm_arm_vcpu_stopped(vcpu)) && (!vcpu->arch.pause),
+			   TASK_INTERRUPTIBLE);
+
+	if (kvm_arm_vcpu_stopped(vcpu) || vcpu->arch.pause) {
+		/* Awaken to handle a signal, request we sleep again later. */
+		kvm_make_request(KVM_REQ_SLEEP, vcpu);
+	}
+
+	/*
+	 * Make sure we will observe a potential reset request if we've
+	 * observed a change to the power state. Pairs with the smp_wmb() in
+	 * kvm_psci_vcpu_on().
+	 */
+	smp_rmb();
+}
+
+/**
+ * kvm_vcpu_wfi - emulate Wait-For-Interrupt behavior
+ * @vcpu:	The VCPU pointer
+ *
+ * Suspend execution of a vCPU until a valid wake event is detected, i.e. until
+ * the vCPU is runnable.  The vCPU may or may not be scheduled out, depending
+ * on when a wake event arrives, e.g. there may already be a pending wake event.
+ */
+void kvm_vcpu_wfi(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * Sync back the state of the GIC CPU interface so that we have
+	 * the latest PMR and group enables. This ensures that
+	 * kvm_arch_vcpu_runnable has up-to-date data to decide whether
+	 * we have pending interrupts, e.g. when determining if the
+	 * vCPU should block.
+	 *
+	 * For the same reason, we want to tell GICv4 that we need
+	 * doorbells to be signalled, should an interrupt become pending.
+	 */
+	preempt_disable();
+	kvm_vgic_vmcr_sync(vcpu);
+	vcpu_set_flag(vcpu, IN_WFI);
+	vgic_v4_put(vcpu);
+	preempt_enable();
+
+	kvm_vcpu_halt(vcpu);
+	vcpu_clear_flag(vcpu, IN_WFIT);
+
+	preempt_disable();
+	vcpu_clear_flag(vcpu, IN_WFI);
+	vgic_v4_load(vcpu);
+	preempt_enable();
+}
+
+static int kvm_vcpu_suspend(struct kvm_vcpu *vcpu)
+{
+	if (!kvm_arm_vcpu_suspended(vcpu))
+		return 1;
+
+	kvm_vcpu_wfi(vcpu);
+
+	/*
+	 * The suspend state is sticky; we do not leave it until userspace
+	 * explicitly marks the vCPU as runnable. Request that we suspend again
+	 * later.
+	 */
+	kvm_make_request(KVM_REQ_SUSPEND, vcpu);
+
+	/*
+	 * Check to make sure the vCPU is actually runnable. If so, exit to
+	 * userspace informing it of the wakeup condition.
+	 */
+	if (kvm_arch_vcpu_runnable(vcpu)) {
+		memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
+		vcpu->run->system_event.type = KVM_SYSTEM_EVENT_WAKEUP;
+		vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+		return 0;
+	}
+
+	/*
+	 * Otherwise, we were unblocked to process a different event, such as a
+	 * pending signal. Return 1 and allow kvm_arch_vcpu_ioctl_run() to
+	 * process the event.
+	 */
+	return 1;
+}
+
+/**
+ * check_vcpu_requests - check and handle pending vCPU requests
+ * @vcpu:	the VCPU pointer
+ *
+ * Return: 1 if we should enter the guest
+ *	   0 if we should exit to userspace
+ *	   < 0 if we should exit to userspace, where the return value indicates
+ *	   an error
+ */
+static int check_vcpu_requests(struct kvm_vcpu *vcpu)
+{
+	if (kvm_request_pending(vcpu)) {
+		if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
+			kvm_vcpu_sleep(vcpu);
+
+		if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
+			kvm_reset_vcpu(vcpu);
+
+		/*
+		 * Clear IRQ_PENDING requests that were made to guarantee
+		 * that a VCPU sees new virtual interrupts.
+		 */
+		kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
+
+		if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
+			kvm_update_stolen_time(vcpu);
+
+		if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) {
+			/* The distributor enable bits were changed */
+			preempt_disable();
+			vgic_v4_put(vcpu);
+			vgic_v4_load(vcpu);
+			preempt_enable();
+		}
+
+		if (kvm_check_request(KVM_REQ_RELOAD_PMU, vcpu))
+			kvm_pmu_handle_pmcr(vcpu,
+					    __vcpu_sys_reg(vcpu, PMCR_EL0));
+
+		if (kvm_check_request(KVM_REQ_SUSPEND, vcpu))
+			return kvm_vcpu_suspend(vcpu);
+	}
+
+	return 1;
+}
+
+static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu)
+{
+	if (likely(!vcpu_mode_is_32bit(vcpu)))
+		return false;
+
+	return !kvm_supports_32bit_el0();
+}
+
+/**
+ * kvm_vcpu_exit_request - returns true if the VCPU should *not* enter the guest
+ * @vcpu:	The VCPU pointer
+ * @ret:	Pointer to write optional return code
+ *
+ * Returns: true if the VCPU needs to return to a preemptible + interruptible
+ *	    and skip guest entry.
+ *
+ * This function disambiguates between two different types of exits: exits to a
+ * preemptible + interruptible kernel context and exits to userspace. For an
+ * exit to userspace, this function will write the return code to ret and return
+ * true. For an exit to preemptible + interruptible kernel context (i.e. check
+ * for pending work and re-enter), return true without writing to ret.
+ */
+static bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu, int *ret)
+{
+	struct kvm_run *run = vcpu->run;
+
+	/*
+	 * If we're using a userspace irqchip, then check if we need
+	 * to tell a userspace irqchip about timer or PMU level
+	 * changes and if so, exit to userspace (the actual level
+	 * state gets updated in kvm_timer_update_run and
+	 * kvm_pmu_update_run below).
+	 */
+	if (static_branch_unlikely(&userspace_irqchip_in_use)) {
+		if (kvm_timer_should_notify_user(vcpu) ||
+		    kvm_pmu_should_notify_user(vcpu)) {
+			*ret = -EINTR;
+			run->exit_reason = KVM_EXIT_INTR;
+			return true;
+		}
+	}
+
+	if (unlikely(vcpu_on_unsupported_cpu(vcpu))) {
+		run->exit_reason = KVM_EXIT_FAIL_ENTRY;
+		run->fail_entry.hardware_entry_failure_reason = KVM_EXIT_FAIL_ENTRY_CPU_UNSUPPORTED;
+		run->fail_entry.cpu = smp_processor_id();
+		*ret = 0;
+		return true;
+	}
+
+	return kvm_request_pending(vcpu) ||
+			xfer_to_guest_mode_work_pending();
+}
+
+/*
+ * Actually run the vCPU, entering an RCU extended quiescent state (EQS) while
+ * the vCPU is running.
+ *
+ * This must be noinstr as instrumentation may make use of RCU, and this is not
+ * safe during the EQS.
+ */
+static int noinstr kvm_arm_vcpu_enter_exit(struct kvm_vcpu *vcpu)
+{
+	int ret;
+
+	guest_state_enter_irqoff();
+	ret = kvm_call_hyp_ret(__kvm_vcpu_run, vcpu);
+	guest_state_exit_irqoff();
+
+	return ret;
+}
+
+/**
+ * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
+ * @vcpu:	The VCPU pointer
+ *
+ * This function is called through the VCPU_RUN ioctl called from user space. It
+ * will execute VM code in a loop until the time slice for the process is used
+ * or some emulation is needed from user space in which case the function will
+ * return with return value 0 and with the kvm_run structure filled in with the
+ * required data for the requested emulation.
+ */
+int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+	int ret;
+
+	if (run->exit_reason == KVM_EXIT_MMIO) {
+		ret = kvm_handle_mmio_return(vcpu);
+		if (ret)
+			return ret;
+	}
+
+	vcpu_load(vcpu);
+
+	if (run->immediate_exit) {
+		ret = -EINTR;
+		goto out;
+	}
+
+	kvm_sigset_activate(vcpu);
+
+	ret = 1;
+	run->exit_reason = KVM_EXIT_UNKNOWN;
+	run->flags = 0;
+	while (ret > 0) {
+		/*
+		 * Check conditions before entering the guest
+		 */
+		ret = xfer_to_guest_mode_handle_work(vcpu);
+		if (!ret)
+			ret = 1;
+
+		if (ret > 0)
+			ret = check_vcpu_requests(vcpu);
+
+		/*
+		 * Preparing the interrupts to be injected also
+		 * involves poking the GIC, which must be done in a
+		 * non-preemptible context.
+		 */
+		preempt_disable();
+
+		/*
+		 * The VMID allocator only tracks active VMIDs per
+		 * physical CPU, and therefore the VMID allocated may not be
+		 * preserved on VMID roll-over if the task was preempted,
+		 * making a thread's VMID inactive. So we need to call
+		 * kvm_arm_vmid_update() in non-premptible context.
+		 */
+		kvm_arm_vmid_update(&vcpu->arch.hw_mmu->vmid);
+
+		kvm_pmu_flush_hwstate(vcpu);
+
+		local_irq_disable();
+
+		kvm_vgic_flush_hwstate(vcpu);
+
+		kvm_pmu_update_vcpu_events(vcpu);
+
+		/*
+		 * Ensure we set mode to IN_GUEST_MODE after we disable
+		 * interrupts and before the final VCPU requests check.
+		 * See the comment in kvm_vcpu_exiting_guest_mode() and
+		 * Documentation/virt/kvm/vcpu-requests.rst
+		 */
+		smp_store_mb(vcpu->mode, IN_GUEST_MODE);
+
+		if (ret <= 0 || kvm_vcpu_exit_request(vcpu, &ret)) {
+			vcpu->mode = OUTSIDE_GUEST_MODE;
+			isb(); /* Ensure work in x_flush_hwstate is committed */
+			kvm_pmu_sync_hwstate(vcpu);
+			if (static_branch_unlikely(&userspace_irqchip_in_use))
+				kvm_timer_sync_user(vcpu);
+			kvm_vgic_sync_hwstate(vcpu);
+			local_irq_enable();
+			preempt_enable();
+			continue;
+		}
+
+		kvm_arm_setup_debug(vcpu);
+		kvm_arch_vcpu_ctxflush_fp(vcpu);
+
+		/**************************************************************
+		 * Enter the guest
+		 */
+		trace_kvm_entry(*vcpu_pc(vcpu));
+		guest_timing_enter_irqoff();
+
+		ret = kvm_arm_vcpu_enter_exit(vcpu);
+
+		vcpu->mode = OUTSIDE_GUEST_MODE;
+		vcpu->stat.exits++;
+		/*
+		 * Back from guest
+		 *************************************************************/
+
+		kvm_arm_clear_debug(vcpu);
+
+		/*
+		 * We must sync the PMU state before the vgic state so
+		 * that the vgic can properly sample the updated state of the
+		 * interrupt line.
+		 */
+		kvm_pmu_sync_hwstate(vcpu);
+
+		/*
+		 * Sync the vgic state before syncing the timer state because
+		 * the timer code needs to know if the virtual timer
+		 * interrupts are active.
+		 */
+		kvm_vgic_sync_hwstate(vcpu);
+
+		/*
+		 * Sync the timer hardware state before enabling interrupts as
+		 * we don't want vtimer interrupts to race with syncing the
+		 * timer virtual interrupt state.
+		 */
+		if (static_branch_unlikely(&userspace_irqchip_in_use))
+			kvm_timer_sync_user(vcpu);
+
+		kvm_arch_vcpu_ctxsync_fp(vcpu);
+
+		/*
+		 * We must ensure that any pending interrupts are taken before
+		 * we exit guest timing so that timer ticks are accounted as
+		 * guest time. Transiently unmask interrupts so that any
+		 * pending interrupts are taken.
+		 *
+		 * Per ARM DDI 0487G.b section D1.13.4, an ISB (or other
+		 * context synchronization event) is necessary to ensure that
+		 * pending interrupts are taken.
+		 */
+		if (ARM_EXCEPTION_CODE(ret) == ARM_EXCEPTION_IRQ) {
+			local_irq_enable();
+			isb();
+			local_irq_disable();
+		}
+
+		guest_timing_exit_irqoff();
+
+		local_irq_enable();
+
+		trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
+
+		/* Exit types that need handling before we can be preempted */
+		handle_exit_early(vcpu, ret);
+
+		preempt_enable();
+
+		/*
+		 * The ARMv8 architecture doesn't give the hypervisor
+		 * a mechanism to prevent a guest from dropping to AArch32 EL0
+		 * if implemented by the CPU. If we spot the guest in such
+		 * state and that we decided it wasn't supposed to do so (like
+		 * with the asymmetric AArch32 case), return to userspace with
+		 * a fatal error.
+		 */
+		if (vcpu_mode_is_bad_32bit(vcpu)) {
+			/*
+			 * As we have caught the guest red-handed, decide that
+			 * it isn't fit for purpose anymore by making the vcpu
+			 * invalid. The VMM can try and fix it by issuing  a
+			 * KVM_ARM_VCPU_INIT if it really wants to.
+			 */
+			vcpu->arch.target = -1;
+			ret = ARM_EXCEPTION_IL;
+		}
+
+		ret = handle_exit(vcpu, ret);
+	}
+
+	/* Tell userspace about in-kernel device output levels */
+	if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
+		kvm_timer_update_run(vcpu);
+		kvm_pmu_update_run(vcpu);
+	}
+
+	kvm_sigset_deactivate(vcpu);
+
+out:
+	/*
+	 * In the unlikely event that we are returning to userspace
+	 * with pending exceptions or PC adjustment, commit these
+	 * adjustments in order to give userspace a consistent view of
+	 * the vcpu state. Note that this relies on __kvm_adjust_pc()
+	 * being preempt-safe on VHE.
+	 */
+	if (unlikely(vcpu_get_flag(vcpu, PENDING_EXCEPTION) ||
+		     vcpu_get_flag(vcpu, INCREMENT_PC)))
+		kvm_call_hyp(__kvm_adjust_pc, vcpu);
+
+	vcpu_put(vcpu);
+	return ret;
+}
+
+static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
+{
+	int bit_index;
+	bool set;
+	unsigned long *hcr;
+
+	if (number == KVM_ARM_IRQ_CPU_IRQ)
+		bit_index = __ffs(HCR_VI);
+	else /* KVM_ARM_IRQ_CPU_FIQ */
+		bit_index = __ffs(HCR_VF);
+
+	hcr = vcpu_hcr(vcpu);
+	if (level)
+		set = test_and_set_bit(bit_index, hcr);
+	else
+		set = test_and_clear_bit(bit_index, hcr);
+
+	/*
+	 * If we didn't change anything, no need to wake up or kick other CPUs
+	 */
+	if (set == level)
+		return 0;
+
+	/*
+	 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
+	 * trigger a world-switch round on the running physical CPU to set the
+	 * virtual IRQ/FIQ fields in the HCR appropriately.
+	 */
+	kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
+	kvm_vcpu_kick(vcpu);
+
+	return 0;
+}
+
+int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
+			  bool line_status)
+{
+	u32 irq = irq_level->irq;
+	unsigned int irq_type, vcpu_idx, irq_num;
+	int nrcpus = atomic_read(&kvm->online_vcpus);
+	struct kvm_vcpu *vcpu = NULL;
+	bool level = irq_level->level;
+
+	irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
+	vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
+	vcpu_idx += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1);
+	irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
+
+	trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
+
+	switch (irq_type) {
+	case KVM_ARM_IRQ_TYPE_CPU:
+		if (irqchip_in_kernel(kvm))
+			return -ENXIO;
+
+		if (vcpu_idx >= nrcpus)
+			return -EINVAL;
+
+		vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+		if (!vcpu)
+			return -EINVAL;
+
+		if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
+			return -EINVAL;
+
+		return vcpu_interrupt_line(vcpu, irq_num, level);
+	case KVM_ARM_IRQ_TYPE_PPI:
+		if (!irqchip_in_kernel(kvm))
+			return -ENXIO;
+
+		if (vcpu_idx >= nrcpus)
+			return -EINVAL;
+
+		vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+		if (!vcpu)
+			return -EINVAL;
+
+		if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
+			return -EINVAL;
+
+		return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level, NULL);
+	case KVM_ARM_IRQ_TYPE_SPI:
+		if (!irqchip_in_kernel(kvm))
+			return -ENXIO;
+
+		if (irq_num < VGIC_NR_PRIVATE_IRQS)
+			return -EINVAL;
+
+		return kvm_vgic_inject_irq(kvm, 0, irq_num, level, NULL);
+	}
+
+	return -EINVAL;
+}
+
+static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
+			       const struct kvm_vcpu_init *init)
+{
+	unsigned int i, ret;
+	u32 phys_target = kvm_target_cpu();
+
+	if (init->target != phys_target)
+		return -EINVAL;
+
+	/*
+	 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+	 * use the same target.
+	 */
+	if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
+		return -EINVAL;
+
+	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
+	for (i = 0; i < sizeof(init->features) * 8; i++) {
+		bool set = (init->features[i / 32] & (1 << (i % 32)));
+
+		if (set && i >= KVM_VCPU_MAX_FEATURES)
+			return -ENOENT;
+
+		/*
+		 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+		 * use the same feature set.
+		 */
+		if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
+		    test_bit(i, vcpu->arch.features) != set)
+			return -EINVAL;
+
+		if (set)
+			set_bit(i, vcpu->arch.features);
+	}
+
+	vcpu->arch.target = phys_target;
+
+	/* Now we know what it is, we can reset it. */
+	ret = kvm_reset_vcpu(vcpu);
+	if (ret) {
+		vcpu->arch.target = -1;
+		bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
+	}
+
+	return ret;
+}
+
+static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
+					 struct kvm_vcpu_init *init)
+{
+	int ret;
+
+	ret = kvm_vcpu_set_target(vcpu, init);
+	if (ret)
+		return ret;
+
+	/*
+	 * Ensure a rebooted VM will fault in RAM pages and detect if the
+	 * guest MMU is turned off and flush the caches as needed.
+	 *
+	 * S2FWB enforces all memory accesses to RAM being cacheable,
+	 * ensuring that the data side is always coherent. We still
+	 * need to invalidate the I-cache though, as FWB does *not*
+	 * imply CTR_EL0.DIC.
+	 */
+	if (vcpu_has_run_once(vcpu)) {
+		if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB))
+			stage2_unmap_vm(vcpu->kvm);
+		else
+			icache_inval_all_pou();
+	}
+
+	vcpu_reset_hcr(vcpu);
+	vcpu->arch.cptr_el2 = CPTR_EL2_DEFAULT;
+
+	/*
+	 * Handle the "start in power-off" case.
+	 */
+	if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
+		kvm_arm_vcpu_power_off(vcpu);
+	else
+		WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_RUNNABLE);
+
+	return 0;
+}
+
+static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
+				 struct kvm_device_attr *attr)
+{
+	int ret = -ENXIO;
+
+	switch (attr->group) {
+	default:
+		ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
+		break;
+	}
+
+	return ret;
+}
+
+static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
+				 struct kvm_device_attr *attr)
+{
+	int ret = -ENXIO;
+
+	switch (attr->group) {
+	default:
+		ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
+		break;
+	}
+
+	return ret;
+}
+
+static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
+				 struct kvm_device_attr *attr)
+{
+	int ret = -ENXIO;
+
+	switch (attr->group) {
+	default:
+		ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
+		break;
+	}
+
+	return ret;
+}
+
+static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
+				   struct kvm_vcpu_events *events)
+{
+	memset(events, 0, sizeof(*events));
+
+	return __kvm_arm_vcpu_get_events(vcpu, events);
+}
+
+static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
+				   struct kvm_vcpu_events *events)
+{
+	int i;
+
+	/* check whether the reserved field is zero */
+	for (i = 0; i < ARRAY_SIZE(events->reserved); i++)
+		if (events->reserved[i])
+			return -EINVAL;
+
+	/* check whether the pad field is zero */
+	for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++)
+		if (events->exception.pad[i])
+			return -EINVAL;
+
+	return __kvm_arm_vcpu_set_events(vcpu, events);
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+			 unsigned int ioctl, unsigned long arg)
+{
+	struct kvm_vcpu *vcpu = filp->private_data;
+	void __user *argp = (void __user *)arg;
+	struct kvm_device_attr attr;
+	long r;
+
+	switch (ioctl) {
+	case KVM_ARM_VCPU_INIT: {
+		struct kvm_vcpu_init init;
+
+		r = -EFAULT;
+		if (copy_from_user(&init, argp, sizeof(init)))
+			break;
+
+		r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
+		break;
+	}
+	case KVM_SET_ONE_REG:
+	case KVM_GET_ONE_REG: {
+		struct kvm_one_reg reg;
+
+		r = -ENOEXEC;
+		if (unlikely(!kvm_vcpu_initialized(vcpu)))
+			break;
+
+		r = -EFAULT;
+		if (copy_from_user(&reg, argp, sizeof(reg)))
+			break;
+
+		/*
+		 * We could owe a reset due to PSCI. Handle the pending reset
+		 * here to ensure userspace register accesses are ordered after
+		 * the reset.
+		 */
+		if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
+			kvm_reset_vcpu(vcpu);
+
+		if (ioctl == KVM_SET_ONE_REG)
+			r = kvm_arm_set_reg(vcpu, &reg);
+		else
+			r = kvm_arm_get_reg(vcpu, &reg);
+		break;
+	}
+	case KVM_GET_REG_LIST: {
+		struct kvm_reg_list __user *user_list = argp;
+		struct kvm_reg_list reg_list;
+		unsigned n;
+
+		r = -ENOEXEC;
+		if (unlikely(!kvm_vcpu_initialized(vcpu)))
+			break;
+
+		r = -EPERM;
+		if (!kvm_arm_vcpu_is_finalized(vcpu))
+			break;
+
+		r = -EFAULT;
+		if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
+			break;
+		n = reg_list.n;
+		reg_list.n = kvm_arm_num_regs(vcpu);
+		if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
+			break;
+		r = -E2BIG;
+		if (n < reg_list.n)
+			break;
+		r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
+		break;
+	}
+	case KVM_SET_DEVICE_ATTR: {
+		r = -EFAULT;
+		if (copy_from_user(&attr, argp, sizeof(attr)))
+			break;
+		r = kvm_arm_vcpu_set_attr(vcpu, &attr);
+		break;
+	}
+	case KVM_GET_DEVICE_ATTR: {
+		r = -EFAULT;
+		if (copy_from_user(&attr, argp, sizeof(attr)))
+			break;
+		r = kvm_arm_vcpu_get_attr(vcpu, &attr);
+		break;
+	}
+	case KVM_HAS_DEVICE_ATTR: {
+		r = -EFAULT;
+		if (copy_from_user(&attr, argp, sizeof(attr)))
+			break;
+		r = kvm_arm_vcpu_has_attr(vcpu, &attr);
+		break;
+	}
+	case KVM_GET_VCPU_EVENTS: {
+		struct kvm_vcpu_events events;
+
+		if (kvm_arm_vcpu_get_events(vcpu, &events))
+			return -EINVAL;
+
+		if (copy_to_user(argp, &events, sizeof(events)))
+			return -EFAULT;
+
+		return 0;
+	}
+	case KVM_SET_VCPU_EVENTS: {
+		struct kvm_vcpu_events events;
+
+		if (copy_from_user(&events, argp, sizeof(events)))
+			return -EFAULT;
+
+		return kvm_arm_vcpu_set_events(vcpu, &events);
+	}
+	case KVM_ARM_VCPU_FINALIZE: {
+		int what;
+
+		if (!kvm_vcpu_initialized(vcpu))
+			return -ENOEXEC;
+
+		if (get_user(what, (const int __user *)argp))
+			return -EFAULT;
+
+		return kvm_arm_vcpu_finalize(vcpu, what);
+	}
+	default:
+		r = -EINVAL;
+	}
+
+	return r;
+}
+
+void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
+{
+
+}
+
+void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
+					const struct kvm_memory_slot *memslot)
+{
+	kvm_flush_remote_tlbs(kvm);
+}
+
+static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
+					struct kvm_arm_device_addr *dev_addr)
+{
+	switch (FIELD_GET(KVM_ARM_DEVICE_ID_MASK, dev_addr->id)) {
+	case KVM_ARM_DEVICE_VGIC_V2:
+		if (!vgic_present)
+			return -ENXIO;
+		return kvm_set_legacy_vgic_v2_addr(kvm, dev_addr);
+	default:
+		return -ENODEV;
+	}
+}
+
+long kvm_arch_vm_ioctl(struct file *filp,
+		       unsigned int ioctl, unsigned long arg)
+{
+	struct kvm *kvm = filp->private_data;
+	void __user *argp = (void __user *)arg;
+
+	switch (ioctl) {
+	case KVM_CREATE_IRQCHIP: {
+		int ret;
+		if (!vgic_present)
+			return -ENXIO;
+		mutex_lock(&kvm->lock);
+		ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+		mutex_unlock(&kvm->lock);
+		return ret;
+	}
+	case KVM_ARM_SET_DEVICE_ADDR: {
+		struct kvm_arm_device_addr dev_addr;
+
+		if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
+			return -EFAULT;
+		return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
+	}
+	case KVM_ARM_PREFERRED_TARGET: {
+		struct kvm_vcpu_init init;
+
+		kvm_vcpu_preferred_target(&init);
+
+		if (copy_to_user(argp, &init, sizeof(init)))
+			return -EFAULT;
+
+		return 0;
+	}
+	case KVM_ARM_MTE_COPY_TAGS: {
+		struct kvm_arm_copy_mte_tags copy_tags;
+
+		if (copy_from_user(&copy_tags, argp, sizeof(copy_tags)))
+			return -EFAULT;
+		return kvm_vm_ioctl_mte_copy_tags(kvm, &copy_tags);
+	}
+	default:
+		return -EINVAL;
+	}
+}
+
+static unsigned long nvhe_percpu_size(void)
+{
+	return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) -
+		(unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start);
+}
+
+static unsigned long nvhe_percpu_order(void)
+{
+	unsigned long size = nvhe_percpu_size();
+
+	return size ? get_order(size) : 0;
+}
+
+/* A lookup table holding the hypervisor VA for each vector slot */
+static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS];
+
+static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot)
+{
+	hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot);
+}
+
+static int kvm_init_vector_slots(void)
+{
+	int err;
+	void *base;
+
+	base = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector));
+	kvm_init_vector_slot(base, HYP_VECTOR_DIRECT);
+
+	base = kern_hyp_va(kvm_ksym_ref(__bp_harden_hyp_vecs));
+	kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_DIRECT);
+
+	if (kvm_system_needs_idmapped_vectors() &&
+	    !is_protected_kvm_enabled()) {
+		err = create_hyp_exec_mappings(__pa_symbol(__bp_harden_hyp_vecs),
+					       __BP_HARDEN_HYP_VECS_SZ, &base);
+		if (err)
+			return err;
+	}
+
+	kvm_init_vector_slot(base, HYP_VECTOR_INDIRECT);
+	kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_INDIRECT);
+	return 0;
+}
+
+static void cpu_prepare_hyp_mode(int cpu)
+{
+	struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
+	unsigned long tcr;
+
+	/*
+	 * Calculate the raw per-cpu offset without a translation from the
+	 * kernel's mapping to the linear mapping, and store it in tpidr_el2
+	 * so that we can use adr_l to access per-cpu variables in EL2.
+	 * Also drop the KASAN tag which gets in the way...
+	 */
+	params->tpidr_el2 = (unsigned long)kasan_reset_tag(per_cpu_ptr_nvhe_sym(__per_cpu_start, cpu)) -
+			    (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start));
+
+	params->mair_el2 = read_sysreg(mair_el1);
+
+	/*
+	 * The ID map may be configured to use an extended virtual address
+	 * range. This is only the case if system RAM is out of range for the
+	 * currently configured page size and VA_BITS, in which case we will
+	 * also need the extended virtual range for the HYP ID map, or we won't
+	 * be able to enable the EL2 MMU.
+	 *
+	 * However, at EL2, there is only one TTBR register, and we can't switch
+	 * between translation tables *and* update TCR_EL2.T0SZ at the same
+	 * time. Bottom line: we need to use the extended range with *both* our
+	 * translation tables.
+	 *
+	 * So use the same T0SZ value we use for the ID map.
+	 */
+	tcr = (read_sysreg(tcr_el1) & TCR_EL2_MASK) | TCR_EL2_RES1;
+	tcr &= ~TCR_T0SZ_MASK;
+	tcr |= (idmap_t0sz & GENMASK(TCR_TxSZ_WIDTH - 1, 0)) << TCR_T0SZ_OFFSET;
+	params->tcr_el2 = tcr;
+
+	params->pgd_pa = kvm_mmu_get_httbr();
+	if (is_protected_kvm_enabled())
+		params->hcr_el2 = HCR_HOST_NVHE_PROTECTED_FLAGS;
+	else
+		params->hcr_el2 = HCR_HOST_NVHE_FLAGS;
+	params->vttbr = params->vtcr = 0;
+
+	/*
+	 * Flush the init params from the data cache because the struct will
+	 * be read while the MMU is off.
+	 */
+	kvm_flush_dcache_to_poc(params, sizeof(*params));
+}
+
+static void hyp_install_host_vector(void)
+{
+	struct kvm_nvhe_init_params *params;
+	struct arm_smccc_res res;
+
+	/* Switch from the HYP stub to our own HYP init vector */
+	__hyp_set_vectors(kvm_get_idmap_vector());
+
+	/*
+	 * Call initialization code, and switch to the full blown HYP code.
+	 * If the cpucaps haven't been finalized yet, something has gone very
+	 * wrong, and hyp will crash and burn when it uses any
+	 * cpus_have_const_cap() wrapper.
+	 */
+	BUG_ON(!system_capabilities_finalized());
+	params = this_cpu_ptr_nvhe_sym(kvm_init_params);
+	arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__kvm_hyp_init), virt_to_phys(params), &res);
+	WARN_ON(res.a0 != SMCCC_RET_SUCCESS);
+}
+
+static void cpu_init_hyp_mode(void)
+{
+	hyp_install_host_vector();
+
+	/*
+	 * Disabling SSBD on a non-VHE system requires us to enable SSBS
+	 * at EL2.
+	 */
+	if (this_cpu_has_cap(ARM64_SSBS) &&
+	    arm64_get_spectre_v4_state() == SPECTRE_VULNERABLE) {
+		kvm_call_hyp_nvhe(__kvm_enable_ssbs);
+	}
+}
+
+static void cpu_hyp_reset(void)
+{
+	if (!is_kernel_in_hyp_mode())
+		__hyp_reset_vectors();
+}
+
+/*
+ * EL2 vectors can be mapped and rerouted in a number of ways,
+ * depending on the kernel configuration and CPU present:
+ *
+ * - If the CPU is affected by Spectre-v2, the hardening sequence is
+ *   placed in one of the vector slots, which is executed before jumping
+ *   to the real vectors.
+ *
+ * - If the CPU also has the ARM64_SPECTRE_V3A cap, the slot
+ *   containing the hardening sequence is mapped next to the idmap page,
+ *   and executed before jumping to the real vectors.
+ *
+ * - If the CPU only has the ARM64_SPECTRE_V3A cap, then an
+ *   empty slot is selected, mapped next to the idmap page, and
+ *   executed before jumping to the real vectors.
+ *
+ * Note that ARM64_SPECTRE_V3A is somewhat incompatible with
+ * VHE, as we don't have hypervisor-specific mappings. If the system
+ * is VHE and yet selects this capability, it will be ignored.
+ */
+static void cpu_set_hyp_vector(void)
+{
+	struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data);
+	void *vector = hyp_spectre_vector_selector[data->slot];
+
+	if (!is_protected_kvm_enabled())
+		*this_cpu_ptr_hyp_sym(kvm_hyp_vector) = (unsigned long)vector;
+	else
+		kvm_call_hyp_nvhe(__pkvm_cpu_set_vector, data->slot);
+}
+
+static void cpu_hyp_init_context(void)
+{
+	kvm_init_host_cpu_context(&this_cpu_ptr_hyp_sym(kvm_host_data)->host_ctxt);
+
+	if (!is_kernel_in_hyp_mode())
+		cpu_init_hyp_mode();
+}
+
+static void cpu_hyp_init_features(void)
+{
+	cpu_set_hyp_vector();
+	kvm_arm_init_debug();
+
+	if (is_kernel_in_hyp_mode())
+		kvm_timer_init_vhe();
+
+	if (vgic_present)
+		kvm_vgic_init_cpu_hardware();
+}
+
+static void cpu_hyp_reinit(void)
+{
+	cpu_hyp_reset();
+	cpu_hyp_init_context();
+	cpu_hyp_init_features();
+}
+
+static void _kvm_arch_hardware_enable(void *discard)
+{
+	if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
+		cpu_hyp_reinit();
+		__this_cpu_write(kvm_arm_hardware_enabled, 1);
+	}
+}
+
+int kvm_arch_hardware_enable(void)
+{
+	_kvm_arch_hardware_enable(NULL);
+	return 0;
+}
+
+static void _kvm_arch_hardware_disable(void *discard)
+{
+	if (__this_cpu_read(kvm_arm_hardware_enabled)) {
+		cpu_hyp_reset();
+		__this_cpu_write(kvm_arm_hardware_enabled, 0);
+	}
+}
+
+void kvm_arch_hardware_disable(void)
+{
+	if (!is_protected_kvm_enabled())
+		_kvm_arch_hardware_disable(NULL);
+}
+
+#ifdef CONFIG_CPU_PM
+static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
+				    unsigned long cmd,
+				    void *v)
+{
+	/*
+	 * kvm_arm_hardware_enabled is left with its old value over
+	 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
+	 * re-enable hyp.
+	 */
+	switch (cmd) {
+	case CPU_PM_ENTER:
+		if (__this_cpu_read(kvm_arm_hardware_enabled))
+			/*
+			 * don't update kvm_arm_hardware_enabled here
+			 * so that the hardware will be re-enabled
+			 * when we resume. See below.
+			 */
+			cpu_hyp_reset();
+
+		return NOTIFY_OK;
+	case CPU_PM_ENTER_FAILED:
+	case CPU_PM_EXIT:
+		if (__this_cpu_read(kvm_arm_hardware_enabled))
+			/* The hardware was enabled before suspend. */
+			cpu_hyp_reinit();
+
+		return NOTIFY_OK;
+
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
+static struct notifier_block hyp_init_cpu_pm_nb = {
+	.notifier_call = hyp_init_cpu_pm_notifier,
+};
+
+static void hyp_cpu_pm_init(void)
+{
+	if (!is_protected_kvm_enabled())
+		cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
+}
+static void hyp_cpu_pm_exit(void)
+{
+	if (!is_protected_kvm_enabled())
+		cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
+}
+#else
+static inline void hyp_cpu_pm_init(void)
+{
+}
+static inline void hyp_cpu_pm_exit(void)
+{
+}
+#endif
+
+static void init_cpu_logical_map(void)
+{
+	unsigned int cpu;
+
+	/*
+	 * Copy the MPIDR <-> logical CPU ID mapping to hyp.
+	 * Only copy the set of online CPUs whose features have been checked
+	 * against the finalized system capabilities. The hypervisor will not
+	 * allow any other CPUs from the `possible` set to boot.
+	 */
+	for_each_online_cpu(cpu)
+		hyp_cpu_logical_map[cpu] = cpu_logical_map(cpu);
+}
+
+#define init_psci_0_1_impl_state(config, what)	\
+	config.psci_0_1_ ## what ## _implemented = psci_ops.what
+
+static bool init_psci_relay(void)
+{
+	/*
+	 * If PSCI has not been initialized, protected KVM cannot install
+	 * itself on newly booted CPUs.
+	 */
+	if (!psci_ops.get_version) {
+		kvm_err("Cannot initialize protected mode without PSCI\n");
+		return false;
+	}
+
+	kvm_host_psci_config.version = psci_ops.get_version();
+
+	if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) {
+		kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids();
+		init_psci_0_1_impl_state(kvm_host_psci_config, cpu_suspend);
+		init_psci_0_1_impl_state(kvm_host_psci_config, cpu_on);
+		init_psci_0_1_impl_state(kvm_host_psci_config, cpu_off);
+		init_psci_0_1_impl_state(kvm_host_psci_config, migrate);
+	}
+	return true;
+}
+
+static int init_subsystems(void)
+{
+	int err = 0;
+
+	/*
+	 * Enable hardware so that subsystem initialisation can access EL2.
+	 */
+	on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
+
+	/*
+	 * Register CPU lower-power notifier
+	 */
+	hyp_cpu_pm_init();
+
+	/*
+	 * Init HYP view of VGIC
+	 */
+	err = kvm_vgic_hyp_init();
+	switch (err) {
+	case 0:
+		vgic_present = true;
+		break;
+	case -ENODEV:
+	case -ENXIO:
+		vgic_present = false;
+		err = 0;
+		break;
+	default:
+		goto out;
+	}
+
+	/*
+	 * Init HYP architected timer support
+	 */
+	err = kvm_timer_hyp_init(vgic_present);
+	if (err)
+		goto out;
+
+	kvm_register_perf_callbacks(NULL);
+
+out:
+	if (err || !is_protected_kvm_enabled())
+		on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
+
+	return err;
+}
+
+static void teardown_hyp_mode(void)
+{
+	int cpu;
+
+	free_hyp_pgds();
+	for_each_possible_cpu(cpu) {
+		free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
+		free_pages(kvm_arm_hyp_percpu_base[cpu], nvhe_percpu_order());
+	}
+}
+
+static int do_pkvm_init(u32 hyp_va_bits)
+{
+	void *per_cpu_base = kvm_ksym_ref(kvm_arm_hyp_percpu_base);
+	int ret;
+
+	preempt_disable();
+	cpu_hyp_init_context();
+	ret = kvm_call_hyp_nvhe(__pkvm_init, hyp_mem_base, hyp_mem_size,
+				num_possible_cpus(), kern_hyp_va(per_cpu_base),
+				hyp_va_bits);
+	cpu_hyp_init_features();
+
+	/*
+	 * The stub hypercalls are now disabled, so set our local flag to
+	 * prevent a later re-init attempt in kvm_arch_hardware_enable().
+	 */
+	__this_cpu_write(kvm_arm_hardware_enabled, 1);
+	preempt_enable();
+
+	return ret;
+}
+
+static u64 get_hyp_id_aa64pfr0_el1(void)
+{
+	/*
+	 * Track whether the system isn't affected by spectre/meltdown in the
+	 * hypervisor's view of id_aa64pfr0_el1, used for protected VMs.
+	 * Although this is per-CPU, we make it global for simplicity, e.g., not
+	 * to have to worry about vcpu migration.
+	 *
+	 * Unlike for non-protected VMs, userspace cannot override this for
+	 * protected VMs.
+	 */
+	u64 val = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
+
+	val &= ~(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2) |
+		 ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3));
+
+	val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2),
+			  arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED);
+	val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3),
+			  arm64_get_meltdown_state() == SPECTRE_UNAFFECTED);
+
+	return val;
+}
+
+static void kvm_hyp_init_symbols(void)
+{
+	kvm_nvhe_sym(id_aa64pfr0_el1_sys_val) = get_hyp_id_aa64pfr0_el1();
+	kvm_nvhe_sym(id_aa64pfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1);
+	kvm_nvhe_sym(id_aa64isar0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR0_EL1);
+	kvm_nvhe_sym(id_aa64isar1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR1_EL1);
+	kvm_nvhe_sym(id_aa64isar2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR2_EL1);
+	kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
+	kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR2_EL1);
+}
+
+static int kvm_hyp_init_protection(u32 hyp_va_bits)
+{
+	void *addr = phys_to_virt(hyp_mem_base);
+	int ret;
+
+	ret = create_hyp_mappings(addr, addr + hyp_mem_size, PAGE_HYP);
+	if (ret)
+		return ret;
+
+	ret = do_pkvm_init(hyp_va_bits);
+	if (ret)
+		return ret;
+
+	free_hyp_pgds();
+
+	return 0;
+}
+
+/**
+ * Inits Hyp-mode on all online CPUs
+ */
+static int init_hyp_mode(void)
+{
+	u32 hyp_va_bits;
+	int cpu;
+	int err = -ENOMEM;
+
+	/*
+	 * The protected Hyp-mode cannot be initialized if the memory pool
+	 * allocation has failed.
+	 */
+	if (is_protected_kvm_enabled() && !hyp_mem_base)
+		goto out_err;
+
+	/*
+	 * Allocate Hyp PGD and setup Hyp identity mapping
+	 */
+	err = kvm_mmu_init(&hyp_va_bits);
+	if (err)
+		goto out_err;
+
+	/*
+	 * Allocate stack pages for Hypervisor-mode
+	 */
+	for_each_possible_cpu(cpu) {
+		unsigned long stack_page;
+
+		stack_page = __get_free_page(GFP_KERNEL);
+		if (!stack_page) {
+			err = -ENOMEM;
+			goto out_err;
+		}
+
+		per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
+	}
+
+	/*
+	 * Allocate and initialize pages for Hypervisor-mode percpu regions.
+	 */
+	for_each_possible_cpu(cpu) {
+		struct page *page;
+		void *page_addr;
+
+		page = alloc_pages(GFP_KERNEL, nvhe_percpu_order());
+		if (!page) {
+			err = -ENOMEM;
+			goto out_err;
+		}
+
+		page_addr = page_address(page);
+		memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size());
+		kvm_arm_hyp_percpu_base[cpu] = (unsigned long)page_addr;
+	}
+
+	/*
+	 * Map the Hyp-code called directly from the host
+	 */
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
+				  kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
+	if (err) {
+		kvm_err("Cannot map world-switch code\n");
+		goto out_err;
+	}
+
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
+				  kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
+	if (err) {
+		kvm_err("Cannot map .hyp.rodata section\n");
+		goto out_err;
+	}
+
+	err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
+				  kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
+	if (err) {
+		kvm_err("Cannot map rodata section\n");
+		goto out_err;
+	}
+
+	/*
+	 * .hyp.bss is guaranteed to be placed at the beginning of the .bss
+	 * section thanks to an assertion in the linker script. Map it RW and
+	 * the rest of .bss RO.
+	 */
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_start),
+				  kvm_ksym_ref(__hyp_bss_end), PAGE_HYP);
+	if (err) {
+		kvm_err("Cannot map hyp bss section: %d\n", err);
+		goto out_err;
+	}
+
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_end),
+				  kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
+	if (err) {
+		kvm_err("Cannot map bss section\n");
+		goto out_err;
+	}
+
+	/*
+	 * Map the Hyp stack pages
+	 */
+	for_each_possible_cpu(cpu) {
+		struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
+		char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
+		unsigned long hyp_addr;
+
+		/*
+		 * Allocate a contiguous HYP private VA range for the stack
+		 * and guard page. The allocation is also aligned based on
+		 * the order of its size.
+		 */
+		err = hyp_alloc_private_va_range(PAGE_SIZE * 2, &hyp_addr);
+		if (err) {
+			kvm_err("Cannot allocate hyp stack guard page\n");
+			goto out_err;
+		}
+
+		/*
+		 * Since the stack grows downwards, map the stack to the page
+		 * at the higher address and leave the lower guard page
+		 * unbacked.
+		 *
+		 * Any valid stack address now has the PAGE_SHIFT bit as 1
+		 * and addresses corresponding to the guard page have the
+		 * PAGE_SHIFT bit as 0 - this is used for overflow detection.
+		 */
+		err = __create_hyp_mappings(hyp_addr + PAGE_SIZE, PAGE_SIZE,
+					    __pa(stack_page), PAGE_HYP);
+		if (err) {
+			kvm_err("Cannot map hyp stack\n");
+			goto out_err;
+		}
+
+		/*
+		 * Save the stack PA in nvhe_init_params. This will be needed
+		 * to recreate the stack mapping in protected nVHE mode.
+		 * __hyp_pa() won't do the right thing there, since the stack
+		 * has been mapped in the flexible private VA space.
+		 */
+		params->stack_pa = __pa(stack_page);
+
+		params->stack_hyp_va = hyp_addr + (2 * PAGE_SIZE);
+	}
+
+	for_each_possible_cpu(cpu) {
+		char *percpu_begin = (char *)kvm_arm_hyp_percpu_base[cpu];
+		char *percpu_end = percpu_begin + nvhe_percpu_size();
+
+		/* Map Hyp percpu pages */
+		err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP);
+		if (err) {
+			kvm_err("Cannot map hyp percpu region\n");
+			goto out_err;
+		}
+
+		/* Prepare the CPU initialization parameters */
+		cpu_prepare_hyp_mode(cpu);
+	}
+
+	kvm_hyp_init_symbols();
+
+	if (is_protected_kvm_enabled()) {
+		init_cpu_logical_map();
+
+		if (!init_psci_relay()) {
+			err = -ENODEV;
+			goto out_err;
+		}
+
+		err = kvm_hyp_init_protection(hyp_va_bits);
+		if (err) {
+			kvm_err("Failed to init hyp memory protection\n");
+			goto out_err;
+		}
+	}
+
+	return 0;
+
+out_err:
+	teardown_hyp_mode();
+	kvm_err("error initializing Hyp mode: %d\n", err);
+	return err;
+}
+
+static void _kvm_host_prot_finalize(void *arg)
+{
+	int *err = arg;
+
+	if (WARN_ON(kvm_call_hyp_nvhe(__pkvm_prot_finalize)))
+		WRITE_ONCE(*err, -EINVAL);
+}
+
+static int pkvm_drop_host_privileges(void)
+{
+	int ret = 0;
+
+	/*
+	 * Flip the static key upfront as that may no longer be possible
+	 * once the host stage 2 is installed.
+	 */
+	static_branch_enable(&kvm_protected_mode_initialized);
+	on_each_cpu(_kvm_host_prot_finalize, &ret, 1);
+	return ret;
+}
+
+static int finalize_hyp_mode(void)
+{
+	if (!is_protected_kvm_enabled())
+		return 0;
+
+	/*
+	 * Exclude HYP sections from kmemleak so that they don't get peeked
+	 * at, which would end badly once inaccessible.
+	 */
+	kmemleak_free_part(__hyp_bss_start, __hyp_bss_end - __hyp_bss_start);
+	kmemleak_free_part_phys(hyp_mem_base, hyp_mem_size);
+	return pkvm_drop_host_privileges();
+}
+
+struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
+{
+	struct kvm_vcpu *vcpu;
+	unsigned long i;
+
+	mpidr &= MPIDR_HWID_BITMASK;
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
+			return vcpu;
+	}
+	return NULL;
+}
+
+bool kvm_arch_has_irq_bypass(void)
+{
+	return true;
+}
+
+int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
+				      struct irq_bypass_producer *prod)
+{
+	struct kvm_kernel_irqfd *irqfd =
+		container_of(cons, struct kvm_kernel_irqfd, consumer);
+
+	return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
+					  &irqfd->irq_entry);
+}
+void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
+				      struct irq_bypass_producer *prod)
+{
+	struct kvm_kernel_irqfd *irqfd =
+		container_of(cons, struct kvm_kernel_irqfd, consumer);
+
+	kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
+				     &irqfd->irq_entry);
+}
+
+void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
+{
+	struct kvm_kernel_irqfd *irqfd =
+		container_of(cons, struct kvm_kernel_irqfd, consumer);
+
+	kvm_arm_halt_guest(irqfd->kvm);
+}
+
+void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
+{
+	struct kvm_kernel_irqfd *irqfd =
+		container_of(cons, struct kvm_kernel_irqfd, consumer);
+
+	kvm_arm_resume_guest(irqfd->kvm);
+}
+
+/**
+ * Initialize Hyp-mode and memory mappings on all CPUs.
+ */
+int kvm_arch_init(void *opaque)
+{
+	int err;
+	bool in_hyp_mode;
+
+	if (!is_hyp_mode_available()) {
+		kvm_info("HYP mode not available\n");
+		return -ENODEV;
+	}
+
+	if (kvm_get_mode() == KVM_MODE_NONE) {
+		kvm_info("KVM disabled from command line\n");
+		return -ENODEV;
+	}
+
+	err = kvm_sys_reg_table_init();
+	if (err) {
+		kvm_info("Error initializing system register tables");
+		return err;
+	}
+
+	in_hyp_mode = is_kernel_in_hyp_mode();
+
+	if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||
+	    cpus_have_final_cap(ARM64_WORKAROUND_1508412))
+		kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
+			 "Only trusted guests should be used on this system.\n");
+
+	err = kvm_set_ipa_limit();
+	if (err)
+		return err;
+
+	err = kvm_arm_init_sve();
+	if (err)
+		return err;
+
+	err = kvm_arm_vmid_alloc_init();
+	if (err) {
+		kvm_err("Failed to initialize VMID allocator.\n");
+		return err;
+	}
+
+	if (!in_hyp_mode) {
+		err = init_hyp_mode();
+		if (err)
+			goto out_err;
+	}
+
+	err = kvm_init_vector_slots();
+	if (err) {
+		kvm_err("Cannot initialise vector slots\n");
+		goto out_err;
+	}
+
+	err = init_subsystems();
+	if (err)
+		goto out_hyp;
+
+	if (!in_hyp_mode) {
+		err = finalize_hyp_mode();
+		if (err) {
+			kvm_err("Failed to finalize Hyp protection\n");
+			goto out_hyp;
+		}
+	}
+
+	if (is_protected_kvm_enabled()) {
+		kvm_info("Protected nVHE mode initialized successfully\n");
+	} else if (in_hyp_mode) {
+		kvm_info("VHE mode initialized successfully\n");
+	} else {
+		kvm_info("Hyp mode initialized successfully\n");
+	}
+
+	return 0;
+
+out_hyp:
+	hyp_cpu_pm_exit();
+	if (!in_hyp_mode)
+		teardown_hyp_mode();
+out_err:
+	kvm_arm_vmid_alloc_free();
+	return err;
+}
+
+/* NOP: Compiling as a module not supported */
+void kvm_arch_exit(void)
+{
+	kvm_unregister_perf_callbacks();
+}
+
+static int __init early_kvm_mode_cfg(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	if (strcmp(arg, "none") == 0) {
+		kvm_mode = KVM_MODE_NONE;
+		return 0;
+	}
+
+	if (!is_hyp_mode_available()) {
+		pr_warn_once("KVM is not available. Ignoring kvm-arm.mode\n");
+		return 0;
+	}
+
+	if (strcmp(arg, "protected") == 0) {
+		if (!is_kernel_in_hyp_mode())
+			kvm_mode = KVM_MODE_PROTECTED;
+		else
+			pr_warn_once("Protected KVM not available with VHE\n");
+
+		return 0;
+	}
+
+	if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode())) {
+		kvm_mode = KVM_MODE_DEFAULT;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+early_param("kvm-arm.mode", early_kvm_mode_cfg);
+
+enum kvm_mode kvm_get_mode(void)
+{
+	return kvm_mode;
+}
+
+static int arm_init(void)
+{
+	int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+	return rc;
+}
+
+module_init(arm_init);
diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c
new file mode 100644
index 000000000..fccf9ec01
--- /dev/null
+++ b/arch/arm64/kvm/debug.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Debug and Guest Debug support
+ *
+ * Copyright (C) 2015 - Linaro Ltd
+ * Author: Alex Bennée <alex.bennee@linaro.org>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/hw_breakpoint.h>
+
+#include <asm/debug-monitors.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_emulate.h>
+
+#include "trace.h"
+
+/* These are the bits of MDSCR_EL1 we may manipulate */
+#define MDSCR_EL1_DEBUG_MASK	(DBG_MDSCR_SS | \
+				DBG_MDSCR_KDE | \
+				DBG_MDSCR_MDE)
+
+static DEFINE_PER_CPU(u64, mdcr_el2);
+
+/**
+ * save/restore_guest_debug_regs
+ *
+ * For some debug operations we need to tweak some guest registers. As
+ * a result we need to save the state of those registers before we
+ * make those modifications.
+ *
+ * Guest access to MDSCR_EL1 is trapped by the hypervisor and handled
+ * after we have restored the preserved value to the main context.
+ *
+ * When single-step is enabled by userspace, we tweak PSTATE.SS on every
+ * guest entry. Preserve PSTATE.SS so we can restore the original value
+ * for the vcpu after the single-step is disabled.
+ */
+static void save_guest_debug_regs(struct kvm_vcpu *vcpu)
+{
+	u64 val = vcpu_read_sys_reg(vcpu, MDSCR_EL1);
+
+	vcpu->arch.guest_debug_preserved.mdscr_el1 = val;
+
+	trace_kvm_arm_set_dreg32("Saved MDSCR_EL1",
+				vcpu->arch.guest_debug_preserved.mdscr_el1);
+
+	vcpu->arch.guest_debug_preserved.pstate_ss =
+					(*vcpu_cpsr(vcpu) & DBG_SPSR_SS);
+}
+
+static void restore_guest_debug_regs(struct kvm_vcpu *vcpu)
+{
+	u64 val = vcpu->arch.guest_debug_preserved.mdscr_el1;
+
+	vcpu_write_sys_reg(vcpu, val, MDSCR_EL1);
+
+	trace_kvm_arm_set_dreg32("Restored MDSCR_EL1",
+				vcpu_read_sys_reg(vcpu, MDSCR_EL1));
+
+	if (vcpu->arch.guest_debug_preserved.pstate_ss)
+		*vcpu_cpsr(vcpu) |= DBG_SPSR_SS;
+	else
+		*vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS;
+}
+
+/**
+ * kvm_arm_init_debug - grab what we need for debug
+ *
+ * Currently the sole task of this function is to retrieve the initial
+ * value of mdcr_el2 so we can preserve MDCR_EL2.HPMN which has
+ * presumably been set-up by some knowledgeable bootcode.
+ *
+ * It is called once per-cpu during CPU hyp initialisation.
+ */
+
+void kvm_arm_init_debug(void)
+{
+	__this_cpu_write(mdcr_el2, kvm_call_hyp_ret(__kvm_get_mdcr_el2));
+}
+
+/**
+ * kvm_arm_setup_mdcr_el2 - configure vcpu mdcr_el2 value
+ *
+ * @vcpu:	the vcpu pointer
+ *
+ * This ensures we will trap access to:
+ *  - Performance monitors (MDCR_EL2_TPM/MDCR_EL2_TPMCR)
+ *  - Debug ROM Address (MDCR_EL2_TDRA)
+ *  - OS related registers (MDCR_EL2_TDOSA)
+ *  - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB)
+ *  - Self-hosted Trace Filter controls (MDCR_EL2_TTRF)
+ *  - Self-hosted Trace (MDCR_EL2_TTRF/MDCR_EL2_E2TB)
+ */
+static void kvm_arm_setup_mdcr_el2(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * This also clears MDCR_EL2_E2PB_MASK and MDCR_EL2_E2TB_MASK
+	 * to disable guest access to the profiling and trace buffers
+	 */
+	vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK;
+	vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM |
+				MDCR_EL2_TPMS |
+				MDCR_EL2_TTRF |
+				MDCR_EL2_TPMCR |
+				MDCR_EL2_TDRA |
+				MDCR_EL2_TDOSA);
+
+	/* Is the VM being debugged by userspace? */
+	if (vcpu->guest_debug)
+		/* Route all software debug exceptions to EL2 */
+		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDE;
+
+	/*
+	 * Trap debug register access when one of the following is true:
+	 *  - Userspace is using the hardware to debug the guest
+	 *  (KVM_GUESTDBG_USE_HW is set).
+	 *  - The guest is not using debug (DEBUG_DIRTY clear).
+	 *  - The guest has enabled the OS Lock (debug exceptions are blocked).
+	 */
+	if ((vcpu->guest_debug & KVM_GUESTDBG_USE_HW) ||
+	    !vcpu_get_flag(vcpu, DEBUG_DIRTY) ||
+	    kvm_vcpu_os_lock_enabled(vcpu))
+		vcpu->arch.mdcr_el2 |= MDCR_EL2_TDA;
+
+	trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2);
+}
+
+/**
+ * kvm_arm_vcpu_init_debug - setup vcpu debug traps
+ *
+ * @vcpu:	the vcpu pointer
+ *
+ * Set vcpu initial mdcr_el2 value.
+ */
+void kvm_arm_vcpu_init_debug(struct kvm_vcpu *vcpu)
+{
+	preempt_disable();
+	kvm_arm_setup_mdcr_el2(vcpu);
+	preempt_enable();
+}
+
+/**
+ * kvm_arm_reset_debug_ptr - reset the debug ptr to point to the vcpu state
+ */
+
+void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu)
+{
+	vcpu->arch.debug_ptr = &vcpu->arch.vcpu_debug_state;
+}
+
+/**
+ * kvm_arm_setup_debug - set up debug related stuff
+ *
+ * @vcpu:	the vcpu pointer
+ *
+ * This is called before each entry into the hypervisor to setup any
+ * debug related registers.
+ *
+ * Additionally, KVM only traps guest accesses to the debug registers if
+ * the guest is not actively using them (see the DEBUG_DIRTY
+ * flag on vcpu->arch.iflags).  Since the guest must not interfere
+ * with the hardware state when debugging the guest, we must ensure that
+ * trapping is enabled whenever we are debugging the guest using the
+ * debug registers.
+ */
+
+void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
+{
+	unsigned long mdscr, orig_mdcr_el2 = vcpu->arch.mdcr_el2;
+
+	trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug);
+
+	kvm_arm_setup_mdcr_el2(vcpu);
+
+	/* Check if we need to use the debug registers. */
+	if (vcpu->guest_debug || kvm_vcpu_os_lock_enabled(vcpu)) {
+		/* Save guest debug state */
+		save_guest_debug_regs(vcpu);
+
+		/*
+		 * Single Step (ARM ARM D2.12.3 The software step state
+		 * machine)
+		 *
+		 * If we are doing Single Step we need to manipulate
+		 * the guest's MDSCR_EL1.SS and PSTATE.SS. Once the
+		 * step has occurred the hypervisor will trap the
+		 * debug exception and we return to userspace.
+		 *
+		 * If the guest attempts to single step its userspace
+		 * we would have to deal with a trapped exception
+		 * while in the guest kernel. Because this would be
+		 * hard to unwind we suppress the guest's ability to
+		 * do so by masking MDSCR_EL.SS.
+		 *
+		 * This confuses guest debuggers which use
+		 * single-step behind the scenes but everything
+		 * returns to normal once the host is no longer
+		 * debugging the system.
+		 */
+		if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
+			/*
+			 * If the software step state at the last guest exit
+			 * was Active-pending, we don't set DBG_SPSR_SS so
+			 * that the state is maintained (to not run another
+			 * single-step until the pending Software Step
+			 * exception is taken).
+			 */
+			if (!vcpu_get_flag(vcpu, DBG_SS_ACTIVE_PENDING))
+				*vcpu_cpsr(vcpu) |= DBG_SPSR_SS;
+			else
+				*vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS;
+
+			mdscr = vcpu_read_sys_reg(vcpu, MDSCR_EL1);
+			mdscr |= DBG_MDSCR_SS;
+			vcpu_write_sys_reg(vcpu, mdscr, MDSCR_EL1);
+		} else {
+			mdscr = vcpu_read_sys_reg(vcpu, MDSCR_EL1);
+			mdscr &= ~DBG_MDSCR_SS;
+			vcpu_write_sys_reg(vcpu, mdscr, MDSCR_EL1);
+		}
+
+		trace_kvm_arm_set_dreg32("SPSR_EL2", *vcpu_cpsr(vcpu));
+
+		/*
+		 * HW Breakpoints and watchpoints
+		 *
+		 * We simply switch the debug_ptr to point to our new
+		 * external_debug_state which has been populated by the
+		 * debug ioctl. The existing DEBUG_DIRTY mechanism ensures
+		 * the registers are updated on the world switch.
+		 */
+		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
+			/* Enable breakpoints/watchpoints */
+			mdscr = vcpu_read_sys_reg(vcpu, MDSCR_EL1);
+			mdscr |= DBG_MDSCR_MDE;
+			vcpu_write_sys_reg(vcpu, mdscr, MDSCR_EL1);
+
+			vcpu->arch.debug_ptr = &vcpu->arch.external_debug_state;
+			vcpu_set_flag(vcpu, DEBUG_DIRTY);
+
+			trace_kvm_arm_set_regset("BKPTS", get_num_brps(),
+						&vcpu->arch.debug_ptr->dbg_bcr[0],
+						&vcpu->arch.debug_ptr->dbg_bvr[0]);
+
+			trace_kvm_arm_set_regset("WAPTS", get_num_wrps(),
+						&vcpu->arch.debug_ptr->dbg_wcr[0],
+						&vcpu->arch.debug_ptr->dbg_wvr[0]);
+
+		/*
+		 * The OS Lock blocks debug exceptions in all ELs when it is
+		 * enabled. If the guest has enabled the OS Lock, constrain its
+		 * effects to the guest. Emulate the behavior by clearing
+		 * MDSCR_EL1.MDE. In so doing, we ensure that host debug
+		 * exceptions are unaffected by guest configuration of the OS
+		 * Lock.
+		 */
+		} else if (kvm_vcpu_os_lock_enabled(vcpu)) {
+			mdscr = vcpu_read_sys_reg(vcpu, MDSCR_EL1);
+			mdscr &= ~DBG_MDSCR_MDE;
+			vcpu_write_sys_reg(vcpu, mdscr, MDSCR_EL1);
+		}
+	}
+
+	BUG_ON(!vcpu->guest_debug &&
+		vcpu->arch.debug_ptr != &vcpu->arch.vcpu_debug_state);
+
+	/* If KDE or MDE are set, perform a full save/restore cycle. */
+	if (vcpu_read_sys_reg(vcpu, MDSCR_EL1) & (DBG_MDSCR_KDE | DBG_MDSCR_MDE))
+		vcpu_set_flag(vcpu, DEBUG_DIRTY);
+
+	/* Write mdcr_el2 changes since vcpu_load on VHE systems */
+	if (has_vhe() && orig_mdcr_el2 != vcpu->arch.mdcr_el2)
+		write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
+
+	trace_kvm_arm_set_dreg32("MDSCR_EL1", vcpu_read_sys_reg(vcpu, MDSCR_EL1));
+}
+
+void kvm_arm_clear_debug(struct kvm_vcpu *vcpu)
+{
+	trace_kvm_arm_clear_debug(vcpu->guest_debug);
+
+	/*
+	 * Restore the guest's debug registers if we were using them.
+	 */
+	if (vcpu->guest_debug || kvm_vcpu_os_lock_enabled(vcpu)) {
+		if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
+			if (!(*vcpu_cpsr(vcpu) & DBG_SPSR_SS))
+				/*
+				 * Mark the vcpu as ACTIVE_PENDING
+				 * until Software Step exception is taken.
+				 */
+				vcpu_set_flag(vcpu, DBG_SS_ACTIVE_PENDING);
+		}
+
+		restore_guest_debug_regs(vcpu);
+
+		/*
+		 * If we were using HW debug we need to restore the
+		 * debug_ptr to the guest debug state.
+		 */
+		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
+			kvm_arm_reset_debug_ptr(vcpu);
+
+			trace_kvm_arm_set_regset("BKPTS", get_num_brps(),
+						&vcpu->arch.debug_ptr->dbg_bcr[0],
+						&vcpu->arch.debug_ptr->dbg_bvr[0]);
+
+			trace_kvm_arm_set_regset("WAPTS", get_num_wrps(),
+						&vcpu->arch.debug_ptr->dbg_wcr[0],
+						&vcpu->arch.debug_ptr->dbg_wvr[0]);
+		}
+	}
+}
+
+void kvm_arch_vcpu_load_debug_state_flags(struct kvm_vcpu *vcpu)
+{
+	u64 dfr0;
+
+	/* For VHE, there is nothing to do */
+	if (has_vhe())
+		return;
+
+	dfr0 = read_sysreg(id_aa64dfr0_el1);
+	/*
+	 * If SPE is present on this CPU and is available at current EL,
+	 * we may need to check if the host state needs to be saved.
+	 */
+	if (cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_EL1_PMSVer_SHIFT) &&
+	    !(read_sysreg_s(SYS_PMBIDR_EL1) & BIT(SYS_PMBIDR_EL1_P_SHIFT)))
+		vcpu_set_flag(vcpu, DEBUG_STATE_SAVE_SPE);
+
+	/* Check if we have TRBE implemented and available at the host */
+	if (cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_EL1_TraceBuffer_SHIFT) &&
+	    !(read_sysreg_s(SYS_TRBIDR_EL1) & TRBIDR_PROG))
+		vcpu_set_flag(vcpu, DEBUG_STATE_SAVE_TRBE);
+}
+
+void kvm_arch_vcpu_put_debug_state_flags(struct kvm_vcpu *vcpu)
+{
+	vcpu_clear_flag(vcpu, DEBUG_STATE_SAVE_SPE);
+	vcpu_clear_flag(vcpu, DEBUG_STATE_SAVE_TRBE);
+}
diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c
new file mode 100644
index 000000000..ec8e44948
--- /dev/null
+++ b/arch/arm64/kvm/fpsimd.c
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/arm64/kvm/fpsimd.c: Guest/host FPSIMD context coordination helpers
+ *
+ * Copyright 2018 Arm Limited
+ * Author: Dave Martin <Dave.Martin@arm.com>
+ */
+#include <linux/irqflags.h>
+#include <linux/sched.h>
+#include <linux/kvm_host.h>
+#include <asm/fpsimd.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/sysreg.h>
+
+void kvm_vcpu_unshare_task_fp(struct kvm_vcpu *vcpu)
+{
+	struct task_struct *p = vcpu->arch.parent_task;
+	struct user_fpsimd_state *fpsimd;
+
+	if (!is_protected_kvm_enabled() || !p)
+		return;
+
+	fpsimd = &p->thread.uw.fpsimd_state;
+	kvm_unshare_hyp(fpsimd, fpsimd + 1);
+	put_task_struct(p);
+}
+
+/*
+ * Called on entry to KVM_RUN unless this vcpu previously ran at least
+ * once and the most recent prior KVM_RUN for this vcpu was called from
+ * the same task as current (highly likely).
+ *
+ * This is guaranteed to execute before kvm_arch_vcpu_load_fp(vcpu),
+ * such that on entering hyp the relevant parts of current are already
+ * mapped.
+ */
+int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu)
+{
+	int ret;
+
+	struct user_fpsimd_state *fpsimd = &current->thread.uw.fpsimd_state;
+
+	kvm_vcpu_unshare_task_fp(vcpu);
+
+	/* Make sure the host task fpsimd state is visible to hyp: */
+	ret = kvm_share_hyp(fpsimd, fpsimd + 1);
+	if (ret)
+		return ret;
+
+	vcpu->arch.host_fpsimd_state = kern_hyp_va(fpsimd);
+
+	/*
+	 * We need to keep current's task_struct pinned until its data has been
+	 * unshared with the hypervisor to make sure it is not re-used by the
+	 * kernel and donated to someone else while already shared -- see
+	 * kvm_vcpu_unshare_task_fp() for the matching put_task_struct().
+	 */
+	if (is_protected_kvm_enabled()) {
+		get_task_struct(current);
+		vcpu->arch.parent_task = current;
+	}
+
+	return 0;
+}
+
+/*
+ * Prepare vcpu for saving the host's FPSIMD state and loading the guest's.
+ * The actual loading is done by the FPSIMD access trap taken to hyp.
+ *
+ * Here, we just set the correct metadata to indicate that the FPSIMD
+ * state in the cpu regs (if any) belongs to current on the host.
+ */
+void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
+{
+	BUG_ON(!current->mm);
+	BUG_ON(test_thread_flag(TIF_SVE));
+
+	if (!system_supports_fpsimd())
+		return;
+
+	vcpu->arch.fp_state = FP_STATE_HOST_OWNED;
+
+	vcpu_clear_flag(vcpu, HOST_SVE_ENABLED);
+	if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN)
+		vcpu_set_flag(vcpu, HOST_SVE_ENABLED);
+
+	/*
+	 * We don't currently support SME guests but if we leave
+	 * things in streaming mode then when the guest starts running
+	 * FPSIMD or SVE code it may generate SME traps so as a
+	 * special case if we are in streaming mode we force the host
+	 * state to be saved now and exit streaming mode so that we
+	 * don't have to handle any SME traps for valid guest
+	 * operations. Do this for ZA as well for now for simplicity.
+	 */
+	if (system_supports_sme()) {
+		vcpu_clear_flag(vcpu, HOST_SME_ENABLED);
+		if (read_sysreg(cpacr_el1) & CPACR_EL1_SMEN_EL0EN)
+			vcpu_set_flag(vcpu, HOST_SME_ENABLED);
+
+		if (read_sysreg_s(SYS_SVCR) & (SVCR_SM_MASK | SVCR_ZA_MASK)) {
+			vcpu->arch.fp_state = FP_STATE_FREE;
+			fpsimd_save_and_flush_cpu_state();
+		}
+	}
+}
+
+/*
+ * Called just before entering the guest once we are no longer preemptable
+ * and interrupts are disabled. If we have managed to run anything using
+ * FP while we were preemptible (such as off the back of an interrupt),
+ * then neither the host nor the guest own the FP hardware (and it was the
+ * responsibility of the code that used FP to save the existing state).
+ */
+void kvm_arch_vcpu_ctxflush_fp(struct kvm_vcpu *vcpu)
+{
+	if (test_thread_flag(TIF_FOREIGN_FPSTATE))
+		vcpu->arch.fp_state = FP_STATE_FREE;
+}
+
+/*
+ * Called just after exiting the guest. If the guest FPSIMD state
+ * was loaded, update the host's context tracking data mark the CPU
+ * FPSIMD regs as dirty and belonging to vcpu so that they will be
+ * written back if the kernel clobbers them due to kernel-mode NEON
+ * before re-entry into the guest.
+ */
+void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu)
+{
+	WARN_ON_ONCE(!irqs_disabled());
+
+	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED) {
+		/*
+		 * Currently we do not support SME guests so SVCR is
+		 * always 0 and we just need a variable to point to.
+		 */
+		fpsimd_bind_state_to_cpu(&vcpu->arch.ctxt.fp_regs,
+					 vcpu->arch.sve_state,
+					 vcpu->arch.sve_max_vl,
+					 NULL, 0, &vcpu->arch.svcr);
+
+		clear_thread_flag(TIF_FOREIGN_FPSTATE);
+		update_thread_flag(TIF_SVE, vcpu_has_sve(vcpu));
+	}
+}
+
+/*
+ * Write back the vcpu FPSIMD regs if they are dirty, and invalidate the
+ * cpu FPSIMD regs so that they can't be spuriously reused if this vcpu
+ * disappears and another task or vcpu appears that recycles the same
+ * struct fpsimd_state.
+ */
+void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	/*
+	 * If we have VHE then the Hyp code will reset CPACR_EL1 to
+	 * CPACR_EL1_DEFAULT and we need to reenable SME.
+	 */
+	if (has_vhe() && system_supports_sme()) {
+		/* Also restore EL0 state seen on entry */
+		if (vcpu_get_flag(vcpu, HOST_SME_ENABLED))
+			sysreg_clear_set(CPACR_EL1, 0,
+					 CPACR_EL1_SMEN_EL0EN |
+					 CPACR_EL1_SMEN_EL1EN);
+		else
+			sysreg_clear_set(CPACR_EL1,
+					 CPACR_EL1_SMEN_EL0EN,
+					 CPACR_EL1_SMEN_EL1EN);
+	}
+
+	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED) {
+		if (vcpu_has_sve(vcpu)) {
+			__vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_el1(SYS_ZCR);
+
+			/* Restore the VL that was saved when bound to the CPU */
+			if (!has_vhe())
+				sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1,
+						       SYS_ZCR_EL1);
+		}
+
+		fpsimd_save_and_flush_cpu_state();
+	} else if (has_vhe() && system_supports_sve()) {
+		/*
+		 * The FPSIMD/SVE state in the CPU has not been touched, and we
+		 * have SVE (and VHE): CPACR_EL1 (alias CPTR_EL2) has been
+		 * reset to CPACR_EL1_DEFAULT by the Hyp code, disabling SVE
+		 * for EL0.  To avoid spurious traps, restore the trap state
+		 * seen by kvm_arch_vcpu_load_fp():
+		 */
+		if (vcpu_get_flag(vcpu, HOST_SVE_ENABLED))
+			sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_ZEN_EL0EN);
+		else
+			sysreg_clear_set(CPACR_EL1, CPACR_EL1_ZEN_EL0EN, 0);
+	}
+
+	update_thread_flag(TIF_SVE, 0);
+
+	local_irq_restore(flags);
+}
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
new file mode 100644
index 000000000..f44ae09a5
--- /dev/null
+++ b/arch/arm64/kvm/guest.c
@@ -0,0 +1,1102 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/guest.c:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/nospec.h>
+#include <linux/kvm_host.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <kvm/arm_hypercalls.h>
+#include <asm/cputype.h>
+#include <linux/uaccess.h>
+#include <asm/fpsimd.h>
+#include <asm/kvm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/sigcontext.h>
+
+#include "trace.h"
+
+const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+	KVM_GENERIC_VM_STATS()
+};
+
+const struct kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_SIZE,
+	.num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
+	.id_offset =  sizeof(struct kvm_stats_header),
+	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
+	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
+		       sizeof(kvm_vm_stats_desc),
+};
+
+const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+	KVM_GENERIC_VCPU_STATS(),
+	STATS_DESC_COUNTER(VCPU, hvc_exit_stat),
+	STATS_DESC_COUNTER(VCPU, wfe_exit_stat),
+	STATS_DESC_COUNTER(VCPU, wfi_exit_stat),
+	STATS_DESC_COUNTER(VCPU, mmio_exit_user),
+	STATS_DESC_COUNTER(VCPU, mmio_exit_kernel),
+	STATS_DESC_COUNTER(VCPU, signal_exits),
+	STATS_DESC_COUNTER(VCPU, exits)
+};
+
+const struct kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_SIZE,
+	.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.id_offset = sizeof(struct kvm_stats_header),
+	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
+	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
+		       sizeof(kvm_vcpu_stats_desc),
+};
+
+static bool core_reg_offset_is_vreg(u64 off)
+{
+	return off >= KVM_REG_ARM_CORE_REG(fp_regs.vregs) &&
+		off < KVM_REG_ARM_CORE_REG(fp_regs.fpsr);
+}
+
+static u64 core_reg_offset_from_id(u64 id)
+{
+	return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
+}
+
+static int core_reg_size_from_offset(const struct kvm_vcpu *vcpu, u64 off)
+{
+	int size;
+
+	switch (off) {
+	case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
+	     KVM_REG_ARM_CORE_REG(regs.regs[30]):
+	case KVM_REG_ARM_CORE_REG(regs.sp):
+	case KVM_REG_ARM_CORE_REG(regs.pc):
+	case KVM_REG_ARM_CORE_REG(regs.pstate):
+	case KVM_REG_ARM_CORE_REG(sp_el1):
+	case KVM_REG_ARM_CORE_REG(elr_el1):
+	case KVM_REG_ARM_CORE_REG(spsr[0]) ...
+	     KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
+		size = sizeof(__u64);
+		break;
+
+	case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
+	     KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
+		size = sizeof(__uint128_t);
+		break;
+
+	case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
+	case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
+		size = sizeof(__u32);
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (!IS_ALIGNED(off, size / sizeof(__u32)))
+		return -EINVAL;
+
+	/*
+	 * The KVM_REG_ARM64_SVE regs must be used instead of
+	 * KVM_REG_ARM_CORE for accessing the FPSIMD V-registers on
+	 * SVE-enabled vcpus:
+	 */
+	if (vcpu_has_sve(vcpu) && core_reg_offset_is_vreg(off))
+		return -EINVAL;
+
+	return size;
+}
+
+static void *core_reg_addr(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	u64 off = core_reg_offset_from_id(reg->id);
+	int size = core_reg_size_from_offset(vcpu, off);
+
+	if (size < 0)
+		return NULL;
+
+	if (KVM_REG_SIZE(reg->id) != size)
+		return NULL;
+
+	switch (off) {
+	case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
+	     KVM_REG_ARM_CORE_REG(regs.regs[30]):
+		off -= KVM_REG_ARM_CORE_REG(regs.regs[0]);
+		off /= 2;
+		return &vcpu->arch.ctxt.regs.regs[off];
+
+	case KVM_REG_ARM_CORE_REG(regs.sp):
+		return &vcpu->arch.ctxt.regs.sp;
+
+	case KVM_REG_ARM_CORE_REG(regs.pc):
+		return &vcpu->arch.ctxt.regs.pc;
+
+	case KVM_REG_ARM_CORE_REG(regs.pstate):
+		return &vcpu->arch.ctxt.regs.pstate;
+
+	case KVM_REG_ARM_CORE_REG(sp_el1):
+		return __ctxt_sys_reg(&vcpu->arch.ctxt, SP_EL1);
+
+	case KVM_REG_ARM_CORE_REG(elr_el1):
+		return __ctxt_sys_reg(&vcpu->arch.ctxt, ELR_EL1);
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_EL1]):
+		return __ctxt_sys_reg(&vcpu->arch.ctxt, SPSR_EL1);
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_ABT]):
+		return &vcpu->arch.ctxt.spsr_abt;
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_UND]):
+		return &vcpu->arch.ctxt.spsr_und;
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_IRQ]):
+		return &vcpu->arch.ctxt.spsr_irq;
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_FIQ]):
+		return &vcpu->arch.ctxt.spsr_fiq;
+
+	case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
+	     KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
+		off -= KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]);
+		off /= 4;
+		return &vcpu->arch.ctxt.fp_regs.vregs[off];
+
+	case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
+		return &vcpu->arch.ctxt.fp_regs.fpsr;
+
+	case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
+		return &vcpu->arch.ctxt.fp_regs.fpcr;
+
+	default:
+		return NULL;
+	}
+}
+
+static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	/*
+	 * Because the kvm_regs structure is a mix of 32, 64 and
+	 * 128bit fields, we index it as if it was a 32bit
+	 * array. Hence below, nr_regs is the number of entries, and
+	 * off the index in the "array".
+	 */
+	__u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
+	int nr_regs = sizeof(struct kvm_regs) / sizeof(__u32);
+	void *addr;
+	u32 off;
+
+	/* Our ID is an index into the kvm_regs struct. */
+	off = core_reg_offset_from_id(reg->id);
+	if (off >= nr_regs ||
+	    (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
+		return -ENOENT;
+
+	addr = core_reg_addr(vcpu, reg);
+	if (!addr)
+		return -EINVAL;
+
+	if (copy_to_user(uaddr, addr, KVM_REG_SIZE(reg->id)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	__u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
+	int nr_regs = sizeof(struct kvm_regs) / sizeof(__u32);
+	__uint128_t tmp;
+	void *valp = &tmp, *addr;
+	u64 off;
+	int err = 0;
+
+	/* Our ID is an index into the kvm_regs struct. */
+	off = core_reg_offset_from_id(reg->id);
+	if (off >= nr_regs ||
+	    (off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
+		return -ENOENT;
+
+	addr = core_reg_addr(vcpu, reg);
+	if (!addr)
+		return -EINVAL;
+
+	if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
+		return -EINVAL;
+
+	if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
+		err = -EFAULT;
+		goto out;
+	}
+
+	if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
+		u64 mode = (*(u64 *)valp) & PSR_AA32_MODE_MASK;
+		switch (mode) {
+		case PSR_AA32_MODE_USR:
+			if (!kvm_supports_32bit_el0())
+				return -EINVAL;
+			break;
+		case PSR_AA32_MODE_FIQ:
+		case PSR_AA32_MODE_IRQ:
+		case PSR_AA32_MODE_SVC:
+		case PSR_AA32_MODE_ABT:
+		case PSR_AA32_MODE_UND:
+			if (!vcpu_el1_is_32bit(vcpu))
+				return -EINVAL;
+			break;
+		case PSR_MODE_EL0t:
+		case PSR_MODE_EL1t:
+		case PSR_MODE_EL1h:
+			if (vcpu_el1_is_32bit(vcpu))
+				return -EINVAL;
+			break;
+		default:
+			err = -EINVAL;
+			goto out;
+		}
+	}
+
+	memcpy(addr, valp, KVM_REG_SIZE(reg->id));
+
+	if (*vcpu_cpsr(vcpu) & PSR_MODE32_BIT) {
+		int i, nr_reg;
+
+		switch (*vcpu_cpsr(vcpu)) {
+		/*
+		 * Either we are dealing with user mode, and only the
+		 * first 15 registers (+ PC) must be narrowed to 32bit.
+		 * AArch32 r0-r14 conveniently map to AArch64 x0-x14.
+		 */
+		case PSR_AA32_MODE_USR:
+		case PSR_AA32_MODE_SYS:
+			nr_reg = 15;
+			break;
+
+		/*
+		 * Otherwise, this is a privileged mode, and *all* the
+		 * registers must be narrowed to 32bit.
+		 */
+		default:
+			nr_reg = 31;
+			break;
+		}
+
+		for (i = 0; i < nr_reg; i++)
+			vcpu_set_reg(vcpu, i, (u32)vcpu_get_reg(vcpu, i));
+
+		*vcpu_pc(vcpu) = (u32)*vcpu_pc(vcpu);
+	}
+out:
+	return err;
+}
+
+#define vq_word(vq) (((vq) - SVE_VQ_MIN) / 64)
+#define vq_mask(vq) ((u64)1 << ((vq) - SVE_VQ_MIN) % 64)
+#define vq_present(vqs, vq) (!!((vqs)[vq_word(vq)] & vq_mask(vq)))
+
+static int get_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	unsigned int max_vq, vq;
+	u64 vqs[KVM_ARM64_SVE_VLS_WORDS];
+
+	if (!vcpu_has_sve(vcpu))
+		return -ENOENT;
+
+	if (WARN_ON(!sve_vl_valid(vcpu->arch.sve_max_vl)))
+		return -EINVAL;
+
+	memset(vqs, 0, sizeof(vqs));
+
+	max_vq = vcpu_sve_max_vq(vcpu);
+	for (vq = SVE_VQ_MIN; vq <= max_vq; ++vq)
+		if (sve_vq_available(vq))
+			vqs[vq_word(vq)] |= vq_mask(vq);
+
+	if (copy_to_user((void __user *)reg->addr, vqs, sizeof(vqs)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	unsigned int max_vq, vq;
+	u64 vqs[KVM_ARM64_SVE_VLS_WORDS];
+
+	if (!vcpu_has_sve(vcpu))
+		return -ENOENT;
+
+	if (kvm_arm_vcpu_sve_finalized(vcpu))
+		return -EPERM; /* too late! */
+
+	if (WARN_ON(vcpu->arch.sve_state))
+		return -EINVAL;
+
+	if (copy_from_user(vqs, (const void __user *)reg->addr, sizeof(vqs)))
+		return -EFAULT;
+
+	max_vq = 0;
+	for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; ++vq)
+		if (vq_present(vqs, vq))
+			max_vq = vq;
+
+	if (max_vq > sve_vq_from_vl(kvm_sve_max_vl))
+		return -EINVAL;
+
+	/*
+	 * Vector lengths supported by the host can't currently be
+	 * hidden from the guest individually: instead we can only set a
+	 * maximum via ZCR_EL2.LEN.  So, make sure the available vector
+	 * lengths match the set requested exactly up to the requested
+	 * maximum:
+	 */
+	for (vq = SVE_VQ_MIN; vq <= max_vq; ++vq)
+		if (vq_present(vqs, vq) != sve_vq_available(vq))
+			return -EINVAL;
+
+	/* Can't run with no vector lengths at all: */
+	if (max_vq < SVE_VQ_MIN)
+		return -EINVAL;
+
+	/* vcpu->arch.sve_state will be alloc'd by kvm_vcpu_finalize_sve() */
+	vcpu->arch.sve_max_vl = sve_vl_from_vq(max_vq);
+
+	return 0;
+}
+
+#define SVE_REG_SLICE_SHIFT	0
+#define SVE_REG_SLICE_BITS	5
+#define SVE_REG_ID_SHIFT	(SVE_REG_SLICE_SHIFT + SVE_REG_SLICE_BITS)
+#define SVE_REG_ID_BITS		5
+
+#define SVE_REG_SLICE_MASK					\
+	GENMASK(SVE_REG_SLICE_SHIFT + SVE_REG_SLICE_BITS - 1,	\
+		SVE_REG_SLICE_SHIFT)
+#define SVE_REG_ID_MASK							\
+	GENMASK(SVE_REG_ID_SHIFT + SVE_REG_ID_BITS - 1, SVE_REG_ID_SHIFT)
+
+#define SVE_NUM_SLICES (1 << SVE_REG_SLICE_BITS)
+
+#define KVM_SVE_ZREG_SIZE KVM_REG_SIZE(KVM_REG_ARM64_SVE_ZREG(0, 0))
+#define KVM_SVE_PREG_SIZE KVM_REG_SIZE(KVM_REG_ARM64_SVE_PREG(0, 0))
+
+/*
+ * Number of register slices required to cover each whole SVE register.
+ * NOTE: Only the first slice every exists, for now.
+ * If you are tempted to modify this, you must also rework sve_reg_to_region()
+ * to match:
+ */
+#define vcpu_sve_slices(vcpu) 1
+
+/* Bounds of a single SVE register slice within vcpu->arch.sve_state */
+struct sve_state_reg_region {
+	unsigned int koffset;	/* offset into sve_state in kernel memory */
+	unsigned int klen;	/* length in kernel memory */
+	unsigned int upad;	/* extra trailing padding in user memory */
+};
+
+/*
+ * Validate SVE register ID and get sanitised bounds for user/kernel SVE
+ * register copy
+ */
+static int sve_reg_to_region(struct sve_state_reg_region *region,
+			     struct kvm_vcpu *vcpu,
+			     const struct kvm_one_reg *reg)
+{
+	/* reg ID ranges for Z- registers */
+	const u64 zreg_id_min = KVM_REG_ARM64_SVE_ZREG(0, 0);
+	const u64 zreg_id_max = KVM_REG_ARM64_SVE_ZREG(SVE_NUM_ZREGS - 1,
+						       SVE_NUM_SLICES - 1);
+
+	/* reg ID ranges for P- registers and FFR (which are contiguous) */
+	const u64 preg_id_min = KVM_REG_ARM64_SVE_PREG(0, 0);
+	const u64 preg_id_max = KVM_REG_ARM64_SVE_FFR(SVE_NUM_SLICES - 1);
+
+	unsigned int vq;
+	unsigned int reg_num;
+
+	unsigned int reqoffset, reqlen; /* User-requested offset and length */
+	unsigned int maxlen; /* Maximum permitted length */
+
+	size_t sve_state_size;
+
+	const u64 last_preg_id = KVM_REG_ARM64_SVE_PREG(SVE_NUM_PREGS - 1,
+							SVE_NUM_SLICES - 1);
+
+	/* Verify that the P-regs and FFR really do have contiguous IDs: */
+	BUILD_BUG_ON(KVM_REG_ARM64_SVE_FFR(0) != last_preg_id + 1);
+
+	/* Verify that we match the UAPI header: */
+	BUILD_BUG_ON(SVE_NUM_SLICES != KVM_ARM64_SVE_MAX_SLICES);
+
+	reg_num = (reg->id & SVE_REG_ID_MASK) >> SVE_REG_ID_SHIFT;
+
+	if (reg->id >= zreg_id_min && reg->id <= zreg_id_max) {
+		if (!vcpu_has_sve(vcpu) || (reg->id & SVE_REG_SLICE_MASK) > 0)
+			return -ENOENT;
+
+		vq = vcpu_sve_max_vq(vcpu);
+
+		reqoffset = SVE_SIG_ZREG_OFFSET(vq, reg_num) -
+				SVE_SIG_REGS_OFFSET;
+		reqlen = KVM_SVE_ZREG_SIZE;
+		maxlen = SVE_SIG_ZREG_SIZE(vq);
+	} else if (reg->id >= preg_id_min && reg->id <= preg_id_max) {
+		if (!vcpu_has_sve(vcpu) || (reg->id & SVE_REG_SLICE_MASK) > 0)
+			return -ENOENT;
+
+		vq = vcpu_sve_max_vq(vcpu);
+
+		reqoffset = SVE_SIG_PREG_OFFSET(vq, reg_num) -
+				SVE_SIG_REGS_OFFSET;
+		reqlen = KVM_SVE_PREG_SIZE;
+		maxlen = SVE_SIG_PREG_SIZE(vq);
+	} else {
+		return -EINVAL;
+	}
+
+	sve_state_size = vcpu_sve_state_size(vcpu);
+	if (WARN_ON(!sve_state_size))
+		return -EINVAL;
+
+	region->koffset = array_index_nospec(reqoffset, sve_state_size);
+	region->klen = min(maxlen, reqlen);
+	region->upad = reqlen - region->klen;
+
+	return 0;
+}
+
+static int get_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	int ret;
+	struct sve_state_reg_region region;
+	char __user *uptr = (char __user *)reg->addr;
+
+	/* Handle the KVM_REG_ARM64_SVE_VLS pseudo-reg as a special case: */
+	if (reg->id == KVM_REG_ARM64_SVE_VLS)
+		return get_sve_vls(vcpu, reg);
+
+	/* Try to interpret reg ID as an architectural SVE register... */
+	ret = sve_reg_to_region(&region, vcpu, reg);
+	if (ret)
+		return ret;
+
+	if (!kvm_arm_vcpu_sve_finalized(vcpu))
+		return -EPERM;
+
+	if (copy_to_user(uptr, vcpu->arch.sve_state + region.koffset,
+			 region.klen) ||
+	    clear_user(uptr + region.klen, region.upad))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int set_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	int ret;
+	struct sve_state_reg_region region;
+	const char __user *uptr = (const char __user *)reg->addr;
+
+	/* Handle the KVM_REG_ARM64_SVE_VLS pseudo-reg as a special case: */
+	if (reg->id == KVM_REG_ARM64_SVE_VLS)
+		return set_sve_vls(vcpu, reg);
+
+	/* Try to interpret reg ID as an architectural SVE register... */
+	ret = sve_reg_to_region(&region, vcpu, reg);
+	if (ret)
+		return ret;
+
+	if (!kvm_arm_vcpu_sve_finalized(vcpu))
+		return -EPERM;
+
+	if (copy_from_user(vcpu->arch.sve_state + region.koffset, uptr,
+			   region.klen))
+		return -EFAULT;
+
+	return 0;
+}
+
+int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+	return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+	return -EINVAL;
+}
+
+static int copy_core_reg_indices(const struct kvm_vcpu *vcpu,
+				 u64 __user *uindices)
+{
+	unsigned int i;
+	int n = 0;
+
+	for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
+		u64 reg = KVM_REG_ARM64 | KVM_REG_ARM_CORE | i;
+		int size = core_reg_size_from_offset(vcpu, i);
+
+		if (size < 0)
+			continue;
+
+		switch (size) {
+		case sizeof(__u32):
+			reg |= KVM_REG_SIZE_U32;
+			break;
+
+		case sizeof(__u64):
+			reg |= KVM_REG_SIZE_U64;
+			break;
+
+		case sizeof(__uint128_t):
+			reg |= KVM_REG_SIZE_U128;
+			break;
+
+		default:
+			WARN_ON(1);
+			continue;
+		}
+
+		if (uindices) {
+			if (put_user(reg, uindices))
+				return -EFAULT;
+			uindices++;
+		}
+
+		n++;
+	}
+
+	return n;
+}
+
+static unsigned long num_core_regs(const struct kvm_vcpu *vcpu)
+{
+	return copy_core_reg_indices(vcpu, NULL);
+}
+
+/**
+ * ARM64 versions of the TIMER registers, always available on arm64
+ */
+
+#define NUM_TIMER_REGS 3
+
+static bool is_timer_reg(u64 index)
+{
+	switch (index) {
+	case KVM_REG_ARM_TIMER_CTL:
+	case KVM_REG_ARM_TIMER_CNT:
+	case KVM_REG_ARM_TIMER_CVAL:
+		return true;
+	}
+	return false;
+}
+
+static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
+{
+	if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
+		return -EFAULT;
+	uindices++;
+	if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
+		return -EFAULT;
+	uindices++;
+	if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	void __user *uaddr = (void __user *)(long)reg->addr;
+	u64 val;
+	int ret;
+
+	ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
+	if (ret != 0)
+		return -EFAULT;
+
+	return kvm_arm_timer_set_reg(vcpu, reg->id, val);
+}
+
+static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	void __user *uaddr = (void __user *)(long)reg->addr;
+	u64 val;
+
+	val = kvm_arm_timer_get_reg(vcpu, reg->id);
+	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
+}
+
+static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu)
+{
+	const unsigned int slices = vcpu_sve_slices(vcpu);
+
+	if (!vcpu_has_sve(vcpu))
+		return 0;
+
+	/* Policed by KVM_GET_REG_LIST: */
+	WARN_ON(!kvm_arm_vcpu_sve_finalized(vcpu));
+
+	return slices * (SVE_NUM_PREGS + SVE_NUM_ZREGS + 1 /* FFR */)
+		+ 1; /* KVM_REG_ARM64_SVE_VLS */
+}
+
+static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu,
+				u64 __user *uindices)
+{
+	const unsigned int slices = vcpu_sve_slices(vcpu);
+	u64 reg;
+	unsigned int i, n;
+	int num_regs = 0;
+
+	if (!vcpu_has_sve(vcpu))
+		return 0;
+
+	/* Policed by KVM_GET_REG_LIST: */
+	WARN_ON(!kvm_arm_vcpu_sve_finalized(vcpu));
+
+	/*
+	 * Enumerate this first, so that userspace can save/restore in
+	 * the order reported by KVM_GET_REG_LIST:
+	 */
+	reg = KVM_REG_ARM64_SVE_VLS;
+	if (put_user(reg, uindices++))
+		return -EFAULT;
+	++num_regs;
+
+	for (i = 0; i < slices; i++) {
+		for (n = 0; n < SVE_NUM_ZREGS; n++) {
+			reg = KVM_REG_ARM64_SVE_ZREG(n, i);
+			if (put_user(reg, uindices++))
+				return -EFAULT;
+			num_regs++;
+		}
+
+		for (n = 0; n < SVE_NUM_PREGS; n++) {
+			reg = KVM_REG_ARM64_SVE_PREG(n, i);
+			if (put_user(reg, uindices++))
+				return -EFAULT;
+			num_regs++;
+		}
+
+		reg = KVM_REG_ARM64_SVE_FFR(i);
+		if (put_user(reg, uindices++))
+			return -EFAULT;
+		num_regs++;
+	}
+
+	return num_regs;
+}
+
+/**
+ * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
+ *
+ * This is for all registers.
+ */
+unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
+{
+	unsigned long res = 0;
+
+	res += num_core_regs(vcpu);
+	res += num_sve_regs(vcpu);
+	res += kvm_arm_num_sys_reg_descs(vcpu);
+	res += kvm_arm_get_fw_num_regs(vcpu);
+	res += NUM_TIMER_REGS;
+
+	return res;
+}
+
+/**
+ * kvm_arm_copy_reg_indices - get indices of all registers.
+ *
+ * We do core registers right here, then we append system regs.
+ */
+int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
+{
+	int ret;
+
+	ret = copy_core_reg_indices(vcpu, uindices);
+	if (ret < 0)
+		return ret;
+	uindices += ret;
+
+	ret = copy_sve_reg_indices(vcpu, uindices);
+	if (ret < 0)
+		return ret;
+	uindices += ret;
+
+	ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
+	if (ret < 0)
+		return ret;
+	uindices += kvm_arm_get_fw_num_regs(vcpu);
+
+	ret = copy_timer_indices(vcpu, uindices);
+	if (ret < 0)
+		return ret;
+	uindices += NUM_TIMER_REGS;
+
+	return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
+}
+
+int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	/* We currently use nothing arch-specific in upper 32 bits */
+	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
+		return -EINVAL;
+
+	switch (reg->id & KVM_REG_ARM_COPROC_MASK) {
+	case KVM_REG_ARM_CORE:	return get_core_reg(vcpu, reg);
+	case KVM_REG_ARM_FW:
+	case KVM_REG_ARM_FW_FEAT_BMAP:
+		return kvm_arm_get_fw_reg(vcpu, reg);
+	case KVM_REG_ARM64_SVE:	return get_sve_reg(vcpu, reg);
+	}
+
+	if (is_timer_reg(reg->id))
+		return get_timer_reg(vcpu, reg);
+
+	return kvm_arm_sys_reg_get_reg(vcpu, reg);
+}
+
+int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	/* We currently use nothing arch-specific in upper 32 bits */
+	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
+		return -EINVAL;
+
+	switch (reg->id & KVM_REG_ARM_COPROC_MASK) {
+	case KVM_REG_ARM_CORE:	return set_core_reg(vcpu, reg);
+	case KVM_REG_ARM_FW:
+	case KVM_REG_ARM_FW_FEAT_BMAP:
+		return kvm_arm_set_fw_reg(vcpu, reg);
+	case KVM_REG_ARM64_SVE:	return set_sve_reg(vcpu, reg);
+	}
+
+	if (is_timer_reg(reg->id))
+		return set_timer_reg(vcpu, reg);
+
+	return kvm_arm_sys_reg_set_reg(vcpu, reg);
+}
+
+int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
+				  struct kvm_sregs *sregs)
+{
+	return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
+				  struct kvm_sregs *sregs)
+{
+	return -EINVAL;
+}
+
+int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
+			      struct kvm_vcpu_events *events)
+{
+	events->exception.serror_pending = !!(vcpu->arch.hcr_el2 & HCR_VSE);
+	events->exception.serror_has_esr = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
+
+	if (events->exception.serror_pending && events->exception.serror_has_esr)
+		events->exception.serror_esr = vcpu_get_vsesr(vcpu);
+
+	/*
+	 * We never return a pending ext_dabt here because we deliver it to
+	 * the virtual CPU directly when setting the event and it's no longer
+	 * 'pending' at this point.
+	 */
+
+	return 0;
+}
+
+int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
+			      struct kvm_vcpu_events *events)
+{
+	bool serror_pending = events->exception.serror_pending;
+	bool has_esr = events->exception.serror_has_esr;
+	bool ext_dabt_pending = events->exception.ext_dabt_pending;
+
+	if (serror_pending && has_esr) {
+		if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN))
+			return -EINVAL;
+
+		if (!((events->exception.serror_esr) & ~ESR_ELx_ISS_MASK))
+			kvm_set_sei_esr(vcpu, events->exception.serror_esr);
+		else
+			return -EINVAL;
+	} else if (serror_pending) {
+		kvm_inject_vabt(vcpu);
+	}
+
+	if (ext_dabt_pending)
+		kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
+
+	return 0;
+}
+
+u32 __attribute_const__ kvm_target_cpu(void)
+{
+	unsigned long implementor = read_cpuid_implementor();
+	unsigned long part_number = read_cpuid_part_number();
+
+	switch (implementor) {
+	case ARM_CPU_IMP_ARM:
+		switch (part_number) {
+		case ARM_CPU_PART_AEM_V8:
+			return KVM_ARM_TARGET_AEM_V8;
+		case ARM_CPU_PART_FOUNDATION:
+			return KVM_ARM_TARGET_FOUNDATION_V8;
+		case ARM_CPU_PART_CORTEX_A53:
+			return KVM_ARM_TARGET_CORTEX_A53;
+		case ARM_CPU_PART_CORTEX_A57:
+			return KVM_ARM_TARGET_CORTEX_A57;
+		}
+		break;
+	case ARM_CPU_IMP_APM:
+		switch (part_number) {
+		case APM_CPU_PART_XGENE:
+			return KVM_ARM_TARGET_XGENE_POTENZA;
+		}
+		break;
+	}
+
+	/* Return a default generic target */
+	return KVM_ARM_TARGET_GENERIC_V8;
+}
+
+void kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
+{
+	u32 target = kvm_target_cpu();
+
+	memset(init, 0, sizeof(*init));
+
+	/*
+	 * For now, we don't return any features.
+	 * In future, we might use features to return target
+	 * specific features available for the preferred
+	 * target type.
+	 */
+	init->target = (__u32)target;
+}
+
+int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+	return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+	return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
+				  struct kvm_translation *tr)
+{
+	return -EINVAL;
+}
+
+/**
+ * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
+ * @kvm:	pointer to the KVM struct
+ * @kvm_guest_debug: the ioctl data buffer
+ *
+ * This sets up and enables the VM for guest debugging. Userspace
+ * passes in a control flag to enable different debug types and
+ * potentially other architecture specific information in the rest of
+ * the structure.
+ */
+int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
+					struct kvm_guest_debug *dbg)
+{
+	int ret = 0;
+
+	trace_kvm_set_guest_debug(vcpu, dbg->control);
+
+	if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (dbg->control & KVM_GUESTDBG_ENABLE) {
+		vcpu->guest_debug = dbg->control;
+
+		/* Hardware assisted Break and Watch points */
+		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
+			vcpu->arch.external_debug_state = dbg->arch;
+		}
+
+	} else {
+		/* If not enabled clear all flags */
+		vcpu->guest_debug = 0;
+		vcpu_clear_flag(vcpu, DBG_SS_ACTIVE_PENDING);
+	}
+
+out:
+	return ret;
+}
+
+int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
+			       struct kvm_device_attr *attr)
+{
+	int ret;
+
+	switch (attr->group) {
+	case KVM_ARM_VCPU_PMU_V3_CTRL:
+		mutex_lock(&vcpu->kvm->arch.config_lock);
+		ret = kvm_arm_pmu_v3_set_attr(vcpu, attr);
+		mutex_unlock(&vcpu->kvm->arch.config_lock);
+		break;
+	case KVM_ARM_VCPU_TIMER_CTRL:
+		ret = kvm_arm_timer_set_attr(vcpu, attr);
+		break;
+	case KVM_ARM_VCPU_PVTIME_CTRL:
+		ret = kvm_arm_pvtime_set_attr(vcpu, attr);
+		break;
+	default:
+		ret = -ENXIO;
+		break;
+	}
+
+	return ret;
+}
+
+int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
+			       struct kvm_device_attr *attr)
+{
+	int ret;
+
+	switch (attr->group) {
+	case KVM_ARM_VCPU_PMU_V3_CTRL:
+		ret = kvm_arm_pmu_v3_get_attr(vcpu, attr);
+		break;
+	case KVM_ARM_VCPU_TIMER_CTRL:
+		ret = kvm_arm_timer_get_attr(vcpu, attr);
+		break;
+	case KVM_ARM_VCPU_PVTIME_CTRL:
+		ret = kvm_arm_pvtime_get_attr(vcpu, attr);
+		break;
+	default:
+		ret = -ENXIO;
+		break;
+	}
+
+	return ret;
+}
+
+int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
+			       struct kvm_device_attr *attr)
+{
+	int ret;
+
+	switch (attr->group) {
+	case KVM_ARM_VCPU_PMU_V3_CTRL:
+		ret = kvm_arm_pmu_v3_has_attr(vcpu, attr);
+		break;
+	case KVM_ARM_VCPU_TIMER_CTRL:
+		ret = kvm_arm_timer_has_attr(vcpu, attr);
+		break;
+	case KVM_ARM_VCPU_PVTIME_CTRL:
+		ret = kvm_arm_pvtime_has_attr(vcpu, attr);
+		break;
+	default:
+		ret = -ENXIO;
+		break;
+	}
+
+	return ret;
+}
+
+long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
+				struct kvm_arm_copy_mte_tags *copy_tags)
+{
+	gpa_t guest_ipa = copy_tags->guest_ipa;
+	size_t length = copy_tags->length;
+	void __user *tags = copy_tags->addr;
+	gpa_t gfn;
+	bool write = !(copy_tags->flags & KVM_ARM_TAGS_FROM_GUEST);
+	int ret = 0;
+
+	if (!kvm_has_mte(kvm))
+		return -EINVAL;
+
+	if (copy_tags->reserved[0] || copy_tags->reserved[1])
+		return -EINVAL;
+
+	if (copy_tags->flags & ~KVM_ARM_TAGS_FROM_GUEST)
+		return -EINVAL;
+
+	if (length & ~PAGE_MASK || guest_ipa & ~PAGE_MASK)
+		return -EINVAL;
+
+	gfn = gpa_to_gfn(guest_ipa);
+
+	mutex_lock(&kvm->slots_lock);
+
+	while (length > 0) {
+		kvm_pfn_t pfn = gfn_to_pfn_prot(kvm, gfn, write, NULL);
+		void *maddr;
+		unsigned long num_tags;
+		struct page *page;
+
+		if (is_error_noslot_pfn(pfn)) {
+			ret = -EFAULT;
+			goto out;
+		}
+
+		page = pfn_to_online_page(pfn);
+		if (!page) {
+			/* Reject ZONE_DEVICE memory */
+			ret = -EFAULT;
+			goto out;
+		}
+		maddr = page_address(page);
+
+		if (!write) {
+			if (page_mte_tagged(page))
+				num_tags = mte_copy_tags_to_user(tags, maddr,
+							MTE_GRANULES_PER_PAGE);
+			else
+				/* No tags in memory, so write zeros */
+				num_tags = MTE_GRANULES_PER_PAGE -
+					clear_user(tags, MTE_GRANULES_PER_PAGE);
+			kvm_release_pfn_clean(pfn);
+		} else {
+			num_tags = mte_copy_tags_from_user(maddr, tags,
+							MTE_GRANULES_PER_PAGE);
+
+			/*
+			 * Set the flag after checking the write
+			 * completed fully
+			 */
+			if (num_tags == MTE_GRANULES_PER_PAGE)
+				set_page_mte_tagged(page);
+
+			kvm_release_pfn_dirty(pfn);
+		}
+
+		if (num_tags != MTE_GRANULES_PER_PAGE) {
+			ret = -EFAULT;
+			goto out;
+		}
+
+		gfn++;
+		tags += num_tags;
+		length -= PAGE_SIZE;
+	}
+
+out:
+	mutex_unlock(&kvm->slots_lock);
+	/* If some data has been copied report the number of bytes copied */
+	if (length != copy_tags->length)
+		return copy_tags->length - length;
+	return ret;
+}
diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
new file mode 100644
index 000000000..e778eefcf
--- /dev/null
+++ b/arch/arm64/kvm/handle_exit.c
@@ -0,0 +1,376 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/handle_exit.c:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+
+#include <asm/esr.h>
+#include <asm/exception.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_mmu.h>
+#include <asm/debug-monitors.h>
+#include <asm/stacktrace/nvhe.h>
+#include <asm/traps.h>
+
+#include <kvm/arm_hypercalls.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace_handle_exit.h"
+
+typedef int (*exit_handle_fn)(struct kvm_vcpu *);
+
+static void kvm_handle_guest_serror(struct kvm_vcpu *vcpu, u64 esr)
+{
+	if (!arm64_is_ras_serror(esr) || arm64_is_fatal_ras_serror(NULL, esr))
+		kvm_inject_vabt(vcpu);
+}
+
+static int handle_hvc(struct kvm_vcpu *vcpu)
+{
+	int ret;
+
+	trace_kvm_hvc_arm64(*vcpu_pc(vcpu), vcpu_get_reg(vcpu, 0),
+			    kvm_vcpu_hvc_get_imm(vcpu));
+	vcpu->stat.hvc_exit_stat++;
+
+	ret = kvm_hvc_call_handler(vcpu);
+	if (ret < 0) {
+		vcpu_set_reg(vcpu, 0, ~0UL);
+		return 1;
+	}
+
+	return ret;
+}
+
+static int handle_smc(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * "If an SMC instruction executed at Non-secure EL1 is
+	 * trapped to EL2 because HCR_EL2.TSC is 1, the exception is a
+	 * Trap exception, not a Secure Monitor Call exception [...]"
+	 *
+	 * We need to advance the PC after the trap, as it would
+	 * otherwise return to the same address...
+	 */
+	vcpu_set_reg(vcpu, 0, ~0UL);
+	kvm_incr_pc(vcpu);
+	return 1;
+}
+
+/*
+ * Guest access to FP/ASIMD registers are routed to this handler only
+ * when the system doesn't support FP/ASIMD.
+ */
+static int handle_no_fpsimd(struct kvm_vcpu *vcpu)
+{
+	kvm_inject_undefined(vcpu);
+	return 1;
+}
+
+/**
+ * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event
+ *		    instruction executed by a guest
+ *
+ * @vcpu:	the vcpu pointer
+ *
+ * WFE[T]: Yield the CPU and come back to this vcpu when the scheduler
+ * decides to.
+ * WFI: Simply call kvm_vcpu_halt(), which will halt execution of
+ * world-switches and schedule other host processes until there is an
+ * incoming IRQ or FIQ to the VM.
+ * WFIT: Same as WFI, with a timed wakeup implemented as a background timer
+ *
+ * WF{I,E}T can immediately return if the deadline has already expired.
+ */
+static int kvm_handle_wfx(struct kvm_vcpu *vcpu)
+{
+	u64 esr = kvm_vcpu_get_esr(vcpu);
+
+	if (esr & ESR_ELx_WFx_ISS_WFE) {
+		trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
+		vcpu->stat.wfe_exit_stat++;
+	} else {
+		trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
+		vcpu->stat.wfi_exit_stat++;
+	}
+
+	if (esr & ESR_ELx_WFx_ISS_WFxT) {
+		if (esr & ESR_ELx_WFx_ISS_RV) {
+			u64 val, now;
+
+			now = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_TIMER_CNT);
+			val = vcpu_get_reg(vcpu, kvm_vcpu_sys_get_rt(vcpu));
+
+			if (now >= val)
+				goto out;
+		} else {
+			/* Treat WFxT as WFx if RN is invalid */
+			esr &= ~ESR_ELx_WFx_ISS_WFxT;
+		}
+	}
+
+	if (esr & ESR_ELx_WFx_ISS_WFE) {
+		kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu));
+	} else {
+		if (esr & ESR_ELx_WFx_ISS_WFxT)
+			vcpu_set_flag(vcpu, IN_WFIT);
+
+		kvm_vcpu_wfi(vcpu);
+	}
+out:
+	kvm_incr_pc(vcpu);
+
+	return 1;
+}
+
+/**
+ * kvm_handle_guest_debug - handle a debug exception instruction
+ *
+ * @vcpu:	the vcpu pointer
+ *
+ * We route all debug exceptions through the same handler. If both the
+ * guest and host are using the same debug facilities it will be up to
+ * userspace to re-inject the correct exception for guest delivery.
+ *
+ * @return: 0 (while setting vcpu->run->exit_reason)
+ */
+static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+	u64 esr = kvm_vcpu_get_esr(vcpu);
+
+	run->exit_reason = KVM_EXIT_DEBUG;
+	run->debug.arch.hsr = lower_32_bits(esr);
+	run->debug.arch.hsr_high = upper_32_bits(esr);
+	run->flags = KVM_DEBUG_ARCH_HSR_HIGH_VALID;
+
+	switch (ESR_ELx_EC(esr)) {
+	case ESR_ELx_EC_WATCHPT_LOW:
+		run->debug.arch.far = vcpu->arch.fault.far_el2;
+		break;
+	case ESR_ELx_EC_SOFTSTP_LOW:
+		vcpu_clear_flag(vcpu, DBG_SS_ACTIVE_PENDING);
+		break;
+	}
+
+	return 0;
+}
+
+static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu)
+{
+	u64 esr = kvm_vcpu_get_esr(vcpu);
+
+	kvm_pr_unimpl("Unknown exception class: esr: %#016llx -- %s\n",
+		      esr, esr_get_class_string(esr));
+
+	kvm_inject_undefined(vcpu);
+	return 1;
+}
+
+/*
+ * Guest access to SVE registers should be routed to this handler only
+ * when the system doesn't support SVE.
+ */
+static int handle_sve(struct kvm_vcpu *vcpu)
+{
+	kvm_inject_undefined(vcpu);
+	return 1;
+}
+
+/*
+ * Guest usage of a ptrauth instruction (which the guest EL1 did not turn into
+ * a NOP). If we get here, it is that we didn't fixup ptrauth on exit, and all
+ * that we can do is give the guest an UNDEF.
+ */
+static int kvm_handle_ptrauth(struct kvm_vcpu *vcpu)
+{
+	kvm_inject_undefined(vcpu);
+	return 1;
+}
+
+static exit_handle_fn arm_exit_handlers[] = {
+	[0 ... ESR_ELx_EC_MAX]	= kvm_handle_unknown_ec,
+	[ESR_ELx_EC_WFx]	= kvm_handle_wfx,
+	[ESR_ELx_EC_CP15_32]	= kvm_handle_cp15_32,
+	[ESR_ELx_EC_CP15_64]	= kvm_handle_cp15_64,
+	[ESR_ELx_EC_CP14_MR]	= kvm_handle_cp14_32,
+	[ESR_ELx_EC_CP14_LS]	= kvm_handle_cp14_load_store,
+	[ESR_ELx_EC_CP10_ID]	= kvm_handle_cp10_id,
+	[ESR_ELx_EC_CP14_64]	= kvm_handle_cp14_64,
+	[ESR_ELx_EC_HVC32]	= handle_hvc,
+	[ESR_ELx_EC_SMC32]	= handle_smc,
+	[ESR_ELx_EC_HVC64]	= handle_hvc,
+	[ESR_ELx_EC_SMC64]	= handle_smc,
+	[ESR_ELx_EC_SYS64]	= kvm_handle_sys_reg,
+	[ESR_ELx_EC_SVE]	= handle_sve,
+	[ESR_ELx_EC_IABT_LOW]	= kvm_handle_guest_abort,
+	[ESR_ELx_EC_DABT_LOW]	= kvm_handle_guest_abort,
+	[ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,
+	[ESR_ELx_EC_WATCHPT_LOW]= kvm_handle_guest_debug,
+	[ESR_ELx_EC_BREAKPT_LOW]= kvm_handle_guest_debug,
+	[ESR_ELx_EC_BKPT32]	= kvm_handle_guest_debug,
+	[ESR_ELx_EC_BRK64]	= kvm_handle_guest_debug,
+	[ESR_ELx_EC_FP_ASIMD]	= handle_no_fpsimd,
+	[ESR_ELx_EC_PAC]	= kvm_handle_ptrauth,
+};
+
+static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
+{
+	u64 esr = kvm_vcpu_get_esr(vcpu);
+	u8 esr_ec = ESR_ELx_EC(esr);
+
+	return arm_exit_handlers[esr_ec];
+}
+
+/*
+ * We may be single-stepping an emulated instruction. If the emulation
+ * has been completed in the kernel, we can return to userspace with a
+ * KVM_EXIT_DEBUG, otherwise userspace needs to complete its
+ * emulation first.
+ */
+static int handle_trap_exceptions(struct kvm_vcpu *vcpu)
+{
+	int handled;
+
+	/*
+	 * See ARM ARM B1.14.1: "Hyp traps on instructions
+	 * that fail their condition code check"
+	 */
+	if (!kvm_condition_valid(vcpu)) {
+		kvm_incr_pc(vcpu);
+		handled = 1;
+	} else {
+		exit_handle_fn exit_handler;
+
+		exit_handler = kvm_get_exit_handler(vcpu);
+		handled = exit_handler(vcpu);
+	}
+
+	return handled;
+}
+
+/*
+ * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
+ * proper exit to userspace.
+ */
+int handle_exit(struct kvm_vcpu *vcpu, int exception_index)
+{
+	struct kvm_run *run = vcpu->run;
+
+	if (ARM_SERROR_PENDING(exception_index)) {
+		/*
+		 * The SError is handled by handle_exit_early(). If the guest
+		 * survives it will re-execute the original instruction.
+		 */
+		return 1;
+	}
+
+	exception_index = ARM_EXCEPTION_CODE(exception_index);
+
+	switch (exception_index) {
+	case ARM_EXCEPTION_IRQ:
+		return 1;
+	case ARM_EXCEPTION_EL1_SERROR:
+		return 1;
+	case ARM_EXCEPTION_TRAP:
+		return handle_trap_exceptions(vcpu);
+	case ARM_EXCEPTION_HYP_GONE:
+		/*
+		 * EL2 has been reset to the hyp-stub. This happens when a guest
+		 * is pre-emptied by kvm_reboot()'s shutdown call.
+		 */
+		run->exit_reason = KVM_EXIT_FAIL_ENTRY;
+		return 0;
+	case ARM_EXCEPTION_IL:
+		/*
+		 * We attempted an illegal exception return.  Guest state must
+		 * have been corrupted somehow.  Give up.
+		 */
+		run->exit_reason = KVM_EXIT_FAIL_ENTRY;
+		return -EINVAL;
+	default:
+		kvm_pr_unimpl("Unsupported exception type: %d",
+			      exception_index);
+		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+		return 0;
+	}
+}
+
+/* For exit types that need handling before we can be preempted */
+void handle_exit_early(struct kvm_vcpu *vcpu, int exception_index)
+{
+	if (ARM_SERROR_PENDING(exception_index)) {
+		if (this_cpu_has_cap(ARM64_HAS_RAS_EXTN)) {
+			u64 disr = kvm_vcpu_get_disr(vcpu);
+
+			kvm_handle_guest_serror(vcpu, disr_to_esr(disr));
+		} else {
+			kvm_inject_vabt(vcpu);
+		}
+
+		return;
+	}
+
+	exception_index = ARM_EXCEPTION_CODE(exception_index);
+
+	if (exception_index == ARM_EXCEPTION_EL1_SERROR)
+		kvm_handle_guest_serror(vcpu, kvm_vcpu_get_esr(vcpu));
+}
+
+void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
+					      u64 elr_virt, u64 elr_phys,
+					      u64 par, uintptr_t vcpu,
+					      u64 far, u64 hpfar) {
+	u64 elr_in_kimg = __phys_to_kimg(elr_phys);
+	u64 hyp_offset = elr_in_kimg - kaslr_offset() - elr_virt;
+	u64 mode = spsr & PSR_MODE_MASK;
+	u64 panic_addr = elr_virt + hyp_offset;
+
+	if (mode != PSR_MODE_EL2t && mode != PSR_MODE_EL2h) {
+		kvm_err("Invalid host exception to nVHE hyp!\n");
+	} else if (ESR_ELx_EC(esr) == ESR_ELx_EC_BRK64 &&
+		   (esr & ESR_ELx_BRK64_ISS_COMMENT_MASK) == BUG_BRK_IMM) {
+		const char *file = NULL;
+		unsigned int line = 0;
+
+		/* All hyp bugs, including warnings, are treated as fatal. */
+		if (!is_protected_kvm_enabled() ||
+		    IS_ENABLED(CONFIG_NVHE_EL2_DEBUG)) {
+			struct bug_entry *bug = find_bug(elr_in_kimg);
+
+			if (bug)
+				bug_get_file_line(bug, &file, &line);
+		}
+
+		if (file)
+			kvm_err("nVHE hyp BUG at: %s:%u!\n", file, line);
+		else
+			kvm_err("nVHE hyp BUG at: [<%016llx>] %pB!\n", panic_addr,
+					(void *)(panic_addr + kaslr_offset()));
+	} else {
+		kvm_err("nVHE hyp panic at: [<%016llx>] %pB!\n", panic_addr,
+				(void *)(panic_addr + kaslr_offset()));
+	}
+
+	/* Dump the nVHE hypervisor backtrace */
+	kvm_nvhe_dump_backtrace(hyp_offset);
+
+	/*
+	 * Hyp has panicked and we're going to handle that by panicking the
+	 * kernel. The kernel offset will be revealed in the panic so we're
+	 * also safe to reveal the hyp offset as a debugging aid for translating
+	 * hyp VAs to vmlinux addresses.
+	 */
+	kvm_err("Hyp Offset: 0x%llx\n", hyp_offset);
+
+	panic("HYP panic:\nPS:%08llx PC:%016llx ESR:%016llx\nFAR:%016llx HPFAR:%016llx PAR:%016llx\nVCPU:%016lx\n",
+	      spsr, elr_virt, esr, far, hpfar, par, vcpu);
+}
diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
new file mode 100644
index 000000000..a38dea618
--- /dev/null
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Kernel-based Virtual Machine module, HYP part
+#
+
+incdir := $(srctree)/$(src)/include
+subdir-asflags-y := -I$(incdir)
+subdir-ccflags-y := -I$(incdir)
+
+obj-$(CONFIG_KVM) += vhe/ nvhe/ pgtable.o
diff --git a/arch/arm64/kvm/hyp/aarch32.c b/arch/arm64/kvm/hyp/aarch32.c
new file mode 100644
index 000000000..f98cbe262
--- /dev/null
+++ b/arch/arm64/kvm/hyp/aarch32.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hyp portion of the (not much of an) Emulation layer for 32bit guests.
+ *
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * based on arch/arm/kvm/emulate.c
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+
+/*
+ * stolen from arch/arm/kernel/opcodes.c
+ *
+ * condition code lookup table
+ * index into the table is test code: EQ, NE, ... LT, GT, AL, NV
+ *
+ * bit position in short is condition code: NZCV
+ */
+static const unsigned short cc_map[16] = {
+	0xF0F0,			/* EQ == Z set            */
+	0x0F0F,			/* NE                     */
+	0xCCCC,			/* CS == C set            */
+	0x3333,			/* CC                     */
+	0xFF00,			/* MI == N set            */
+	0x00FF,			/* PL                     */
+	0xAAAA,			/* VS == V set            */
+	0x5555,			/* VC                     */
+	0x0C0C,			/* HI == C set && Z clear */
+	0xF3F3,			/* LS == C clear || Z set */
+	0xAA55,			/* GE == (N==V)           */
+	0x55AA,			/* LT == (N!=V)           */
+	0x0A05,			/* GT == (!Z && (N==V))   */
+	0xF5FA,			/* LE == (Z || (N!=V))    */
+	0xFFFF,			/* AL always              */
+	0			/* NV                     */
+};
+
+/*
+ * Check if a trapped instruction should have been executed or not.
+ */
+bool kvm_condition_valid32(const struct kvm_vcpu *vcpu)
+{
+	unsigned long cpsr;
+	u32 cpsr_cond;
+	int cond;
+
+	/* Top two bits non-zero?  Unconditional. */
+	if (kvm_vcpu_get_esr(vcpu) >> 30)
+		return true;
+
+	/* Is condition field valid? */
+	cond = kvm_vcpu_get_condition(vcpu);
+	if (cond == 0xE)
+		return true;
+
+	cpsr = *vcpu_cpsr(vcpu);
+
+	if (cond < 0) {
+		/* This can happen in Thumb mode: examine IT state. */
+		unsigned long it;
+
+		it = ((cpsr >> 8) & 0xFC) | ((cpsr >> 25) & 0x3);
+
+		/* it == 0 => unconditional. */
+		if (it == 0)
+			return true;
+
+		/* The cond for this insn works out as the top 4 bits. */
+		cond = (it >> 4);
+	}
+
+	cpsr_cond = cpsr >> 28;
+
+	if (!((cc_map[cond] >> cpsr_cond) & 1))
+		return false;
+
+	return true;
+}
+
+/**
+ * adjust_itstate - adjust ITSTATE when emulating instructions in IT-block
+ * @vcpu:	The VCPU pointer
+ *
+ * When exceptions occur while instructions are executed in Thumb IF-THEN
+ * blocks, the ITSTATE field of the CPSR is not advanced (updated), so we have
+ * to do this little bit of work manually. The fields map like this:
+ *
+ * IT[7:0] -> CPSR[26:25],CPSR[15:10]
+ */
+static void kvm_adjust_itstate(struct kvm_vcpu *vcpu)
+{
+	unsigned long itbits, cond;
+	unsigned long cpsr = *vcpu_cpsr(vcpu);
+	bool is_arm = !(cpsr & PSR_AA32_T_BIT);
+
+	if (is_arm || !(cpsr & PSR_AA32_IT_MASK))
+		return;
+
+	cond = (cpsr & 0xe000) >> 13;
+	itbits = (cpsr & 0x1c00) >> (10 - 2);
+	itbits |= (cpsr & (0x3 << 25)) >> 25;
+
+	/* Perform ITAdvance (see page A2-52 in ARM DDI 0406C) */
+	if ((itbits & 0x7) == 0)
+		itbits = cond = 0;
+	else
+		itbits = (itbits << 1) & 0x1f;
+
+	cpsr &= ~PSR_AA32_IT_MASK;
+	cpsr |= cond << 13;
+	cpsr |= (itbits & 0x1c) << (10 - 2);
+	cpsr |= (itbits & 0x3) << 25;
+	*vcpu_cpsr(vcpu) = cpsr;
+}
+
+/**
+ * kvm_skip_instr - skip a trapped instruction and proceed to the next
+ * @vcpu: The vcpu pointer
+ */
+void kvm_skip_instr32(struct kvm_vcpu *vcpu)
+{
+	u32 pc = *vcpu_pc(vcpu);
+	bool is_thumb;
+
+	is_thumb = !!(*vcpu_cpsr(vcpu) & PSR_AA32_T_BIT);
+	if (is_thumb && !kvm_vcpu_trap_il_is32bit(vcpu))
+		pc += 2;
+	else
+		pc += 4;
+
+	*vcpu_pc(vcpu) = pc;
+
+	kvm_adjust_itstate(vcpu);
+}
diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S
new file mode 100644
index 000000000..435346ea1
--- /dev/null
+++ b/arch/arm64/kvm/hyp/entry.S
@@ -0,0 +1,215 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/alternative.h>
+#include <asm/assembler.h>
+#include <asm/fpsimdmacros.h>
+#include <asm/kvm.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_mte.h>
+#include <asm/kvm_ptrauth.h>
+
+	.text
+
+/*
+ * u64 __guest_enter(struct kvm_vcpu *vcpu);
+ */
+SYM_FUNC_START(__guest_enter)
+	// x0: vcpu
+	// x1-x17: clobbered by macros
+	// x29: guest context
+
+	adr_this_cpu x1, kvm_hyp_ctxt, x2
+
+	// Store the hyp regs
+	save_callee_saved_regs x1
+
+	// Save hyp's sp_el0
+	save_sp_el0	x1, x2
+
+	// Now the hyp state is stored if we have a pending RAS SError it must
+	// affect the host or hyp. If any asynchronous exception is pending we
+	// defer the guest entry. The DSB isn't necessary before v8.2 as any
+	// SError would be fatal.
+alternative_if ARM64_HAS_RAS_EXTN
+	dsb	nshst
+	isb
+alternative_else_nop_endif
+	mrs	x1, isr_el1
+	cbz	x1,  1f
+	mov	x0, #ARM_EXCEPTION_IRQ
+	ret
+
+1:
+	set_loaded_vcpu x0, x1, x2
+
+	add	x29, x0, #VCPU_CONTEXT
+
+	// mte_switch_to_guest(g_ctxt, h_ctxt, tmp1)
+	mte_switch_to_guest x29, x1, x2
+
+	// Macro ptrauth_switch_to_guest format:
+	// 	ptrauth_switch_to_guest(guest cxt, tmp1, tmp2, tmp3)
+	// The below macro to restore guest keys is not implemented in C code
+	// as it may cause Pointer Authentication key signing mismatch errors
+	// when this feature is enabled for kernel code.
+	ptrauth_switch_to_guest x29, x0, x1, x2
+
+	// Restore the guest's sp_el0
+	restore_sp_el0 x29, x0
+
+	// Restore guest regs x0-x17
+	ldp	x0, x1,   [x29, #CPU_XREG_OFFSET(0)]
+	ldp	x2, x3,   [x29, #CPU_XREG_OFFSET(2)]
+	ldp	x4, x5,   [x29, #CPU_XREG_OFFSET(4)]
+	ldp	x6, x7,   [x29, #CPU_XREG_OFFSET(6)]
+	ldp	x8, x9,   [x29, #CPU_XREG_OFFSET(8)]
+	ldp	x10, x11, [x29, #CPU_XREG_OFFSET(10)]
+	ldp	x12, x13, [x29, #CPU_XREG_OFFSET(12)]
+	ldp	x14, x15, [x29, #CPU_XREG_OFFSET(14)]
+	ldp	x16, x17, [x29, #CPU_XREG_OFFSET(16)]
+
+	// Restore guest regs x18-x29, lr
+	restore_callee_saved_regs x29
+
+	// Do not touch any register after this!
+	eret
+	sb
+
+SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL)
+	// x2-x29,lr: vcpu regs
+	// vcpu x0-x1 on the stack
+
+	// If the hyp context is loaded, go straight to hyp_panic
+	get_loaded_vcpu x0, x1
+	cbnz	x0, 1f
+	b	hyp_panic
+
+1:
+	// The hyp context is saved so make sure it is restored to allow
+	// hyp_panic to run at hyp and, subsequently, panic to run in the host.
+	// This makes use of __guest_exit to avoid duplication but sets the
+	// return address to tail call into hyp_panic. As a side effect, the
+	// current state is saved to the guest context but it will only be
+	// accurate if the guest had been completely restored.
+	adr_this_cpu x0, kvm_hyp_ctxt, x1
+	adr_l	x1, hyp_panic
+	str	x1, [x0, #CPU_XREG_OFFSET(30)]
+
+	get_vcpu_ptr	x1, x0
+
+SYM_INNER_LABEL(__guest_exit, SYM_L_GLOBAL)
+	// x0: return code
+	// x1: vcpu
+	// x2-x29,lr: vcpu regs
+	// vcpu x0-x1 on the stack
+
+	add	x1, x1, #VCPU_CONTEXT
+
+	ALTERNATIVE(nop, SET_PSTATE_PAN(1), ARM64_HAS_PAN, CONFIG_ARM64_PAN)
+
+	// Store the guest regs x2 and x3
+	stp	x2, x3,   [x1, #CPU_XREG_OFFSET(2)]
+
+	// Retrieve the guest regs x0-x1 from the stack
+	ldp	x2, x3, [sp], #16	// x0, x1
+
+	// Store the guest regs x0-x1 and x4-x17
+	stp	x2, x3,   [x1, #CPU_XREG_OFFSET(0)]
+	stp	x4, x5,   [x1, #CPU_XREG_OFFSET(4)]
+	stp	x6, x7,   [x1, #CPU_XREG_OFFSET(6)]
+	stp	x8, x9,   [x1, #CPU_XREG_OFFSET(8)]
+	stp	x10, x11, [x1, #CPU_XREG_OFFSET(10)]
+	stp	x12, x13, [x1, #CPU_XREG_OFFSET(12)]
+	stp	x14, x15, [x1, #CPU_XREG_OFFSET(14)]
+	stp	x16, x17, [x1, #CPU_XREG_OFFSET(16)]
+
+	// Store the guest regs x18-x29, lr
+	save_callee_saved_regs x1
+
+	// Store the guest's sp_el0
+	save_sp_el0	x1, x2
+
+	adr_this_cpu x2, kvm_hyp_ctxt, x3
+
+	// Macro ptrauth_switch_to_hyp format:
+	// 	ptrauth_switch_to_hyp(guest cxt, host cxt, tmp1, tmp2, tmp3)
+	// The below macro to save/restore keys is not implemented in C code
+	// as it may cause Pointer Authentication key signing mismatch errors
+	// when this feature is enabled for kernel code.
+	ptrauth_switch_to_hyp x1, x2, x3, x4, x5
+
+	// mte_switch_to_hyp(g_ctxt, h_ctxt, reg1)
+	mte_switch_to_hyp x1, x2, x3
+
+	// Restore hyp's sp_el0
+	restore_sp_el0 x2, x3
+
+	// Now restore the hyp regs
+	restore_callee_saved_regs x2
+
+	set_loaded_vcpu xzr, x2, x3
+
+alternative_if ARM64_HAS_RAS_EXTN
+	// If we have the RAS extensions we can consume a pending error
+	// without an unmask-SError and isb. The ESB-instruction consumed any
+	// pending guest error when we took the exception from the guest.
+	mrs_s	x2, SYS_DISR_EL1
+	str	x2, [x1, #(VCPU_FAULT_DISR - VCPU_CONTEXT)]
+	cbz	x2, 1f
+	msr_s	SYS_DISR_EL1, xzr
+	orr	x0, x0, #(1<<ARM_EXIT_WITH_SERROR_BIT)
+1:	ret
+alternative_else
+	dsb	sy		// Synchronize against in-flight ld/st
+	isb			// Prevent an early read of side-effect free ISR
+	mrs	x2, isr_el1
+	tbnz	x2, #8, 2f	// ISR_EL1.A
+	ret
+	nop
+2:
+alternative_endif
+	// We know we have a pending asynchronous abort, now is the
+	// time to flush it out. From your VAXorcist book, page 666:
+	// "Threaten me not, oh Evil one!  For I speak with
+	// the power of DEC, and I command thee to show thyself!"
+	mrs	x2, elr_el2
+	mrs	x3, esr_el2
+	mrs	x4, spsr_el2
+	mov	x5, x0
+
+	msr	daifclr, #4	// Unmask aborts
+
+	// This is our single instruction exception window. A pending
+	// SError is guaranteed to occur at the earliest when we unmask
+	// it, and at the latest just after the ISB.
+abort_guest_exit_start:
+
+	isb
+
+abort_guest_exit_end:
+
+	msr	daifset, #4	// Mask aborts
+	ret
+
+	_kvm_extable	abort_guest_exit_start, 9997f
+	_kvm_extable	abort_guest_exit_end, 9997f
+9997:
+	msr	daifset, #4	// Mask aborts
+	mov	x0, #(1 << ARM_EXIT_WITH_SERROR_BIT)
+
+	// restore the EL1 exception context so that we can report some
+	// information. Merge the exception code with the SError pending bit.
+	msr	elr_el2, x2
+	msr	esr_el2, x3
+	msr	spsr_el2, x4
+	orr	x0, x0, x5
+1:	ret
+SYM_FUNC_END(__guest_enter)
diff --git a/arch/arm64/kvm/hyp/exception.c b/arch/arm64/kvm/hyp/exception.c
new file mode 100644
index 000000000..791d3de76
--- /dev/null
+++ b/arch/arm64/kvm/hyp/exception.c
@@ -0,0 +1,351 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Fault injection for both 32 and 64bit guests.
+ *
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Based on arch/arm/kvm/emulate.c
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <hyp/adjust_pc.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_mmu.h>
+
+#if !defined (__KVM_NVHE_HYPERVISOR__) && !defined (__KVM_VHE_HYPERVISOR__)
+#error Hypervisor code only!
+#endif
+
+static inline u64 __vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg)
+{
+	u64 val;
+
+	if (__vcpu_read_sys_reg_from_cpu(reg, &val))
+		return val;
+
+	return __vcpu_sys_reg(vcpu, reg);
+}
+
+static inline void __vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg)
+{
+	if (__vcpu_write_sys_reg_to_cpu(val, reg))
+		return;
+
+	 __vcpu_sys_reg(vcpu, reg) = val;
+}
+
+static void __vcpu_write_spsr(struct kvm_vcpu *vcpu, u64 val)
+{
+	if (has_vhe())
+		write_sysreg_el1(val, SYS_SPSR);
+	else
+		__vcpu_sys_reg(vcpu, SPSR_EL1) = val;
+}
+
+static void __vcpu_write_spsr_abt(struct kvm_vcpu *vcpu, u64 val)
+{
+	if (has_vhe())
+		write_sysreg(val, spsr_abt);
+	else
+		vcpu->arch.ctxt.spsr_abt = val;
+}
+
+static void __vcpu_write_spsr_und(struct kvm_vcpu *vcpu, u64 val)
+{
+	if (has_vhe())
+		write_sysreg(val, spsr_und);
+	else
+		vcpu->arch.ctxt.spsr_und = val;
+}
+
+/*
+ * This performs the exception entry at a given EL (@target_mode), stashing PC
+ * and PSTATE into ELR and SPSR respectively, and compute the new PC/PSTATE.
+ * The EL passed to this function *must* be a non-secure, privileged mode with
+ * bit 0 being set (PSTATE.SP == 1).
+ *
+ * When an exception is taken, most PSTATE fields are left unchanged in the
+ * handler. However, some are explicitly overridden (e.g. M[4:0]). Luckily all
+ * of the inherited bits have the same position in the AArch64/AArch32 SPSR_ELx
+ * layouts, so we don't need to shuffle these for exceptions from AArch32 EL0.
+ *
+ * For the SPSR_ELx layout for AArch64, see ARM DDI 0487E.a page C5-429.
+ * For the SPSR_ELx layout for AArch32, see ARM DDI 0487E.a page C5-426.
+ *
+ * Here we manipulate the fields in order of the AArch64 SPSR_ELx layout, from
+ * MSB to LSB.
+ */
+static void enter_exception64(struct kvm_vcpu *vcpu, unsigned long target_mode,
+			      enum exception_type type)
+{
+	unsigned long sctlr, vbar, old, new, mode;
+	u64 exc_offset;
+
+	mode = *vcpu_cpsr(vcpu) & (PSR_MODE_MASK | PSR_MODE32_BIT);
+
+	if      (mode == target_mode)
+		exc_offset = CURRENT_EL_SP_ELx_VECTOR;
+	else if ((mode | PSR_MODE_THREAD_BIT) == target_mode)
+		exc_offset = CURRENT_EL_SP_EL0_VECTOR;
+	else if (!(mode & PSR_MODE32_BIT))
+		exc_offset = LOWER_EL_AArch64_VECTOR;
+	else
+		exc_offset = LOWER_EL_AArch32_VECTOR;
+
+	switch (target_mode) {
+	case PSR_MODE_EL1h:
+		vbar = __vcpu_read_sys_reg(vcpu, VBAR_EL1);
+		sctlr = __vcpu_read_sys_reg(vcpu, SCTLR_EL1);
+		__vcpu_write_sys_reg(vcpu, *vcpu_pc(vcpu), ELR_EL1);
+		break;
+	default:
+		/* Don't do that */
+		BUG();
+	}
+
+	*vcpu_pc(vcpu) = vbar + exc_offset + type;
+
+	old = *vcpu_cpsr(vcpu);
+	new = 0;
+
+	new |= (old & PSR_N_BIT);
+	new |= (old & PSR_Z_BIT);
+	new |= (old & PSR_C_BIT);
+	new |= (old & PSR_V_BIT);
+
+	if (kvm_has_mte(kern_hyp_va(vcpu->kvm)))
+		new |= PSR_TCO_BIT;
+
+	new |= (old & PSR_DIT_BIT);
+
+	// PSTATE.UAO is set to zero upon any exception to AArch64
+	// See ARM DDI 0487E.a, page D5-2579.
+
+	// PSTATE.PAN is unchanged unless SCTLR_ELx.SPAN == 0b0
+	// SCTLR_ELx.SPAN is RES1 when ARMv8.1-PAN is not implemented
+	// See ARM DDI 0487E.a, page D5-2578.
+	new |= (old & PSR_PAN_BIT);
+	if (!(sctlr & SCTLR_EL1_SPAN))
+		new |= PSR_PAN_BIT;
+
+	// PSTATE.SS is set to zero upon any exception to AArch64
+	// See ARM DDI 0487E.a, page D2-2452.
+
+	// PSTATE.IL is set to zero upon any exception to AArch64
+	// See ARM DDI 0487E.a, page D1-2306.
+
+	// PSTATE.SSBS is set to SCTLR_ELx.DSSBS upon any exception to AArch64
+	// See ARM DDI 0487E.a, page D13-3258
+	if (sctlr & SCTLR_ELx_DSSBS)
+		new |= PSR_SSBS_BIT;
+
+	// PSTATE.BTYPE is set to zero upon any exception to AArch64
+	// See ARM DDI 0487E.a, pages D1-2293 to D1-2294.
+
+	new |= PSR_D_BIT;
+	new |= PSR_A_BIT;
+	new |= PSR_I_BIT;
+	new |= PSR_F_BIT;
+
+	new |= target_mode;
+
+	*vcpu_cpsr(vcpu) = new;
+	__vcpu_write_spsr(vcpu, old);
+}
+
+/*
+ * When an exception is taken, most CPSR fields are left unchanged in the
+ * handler. However, some are explicitly overridden (e.g. M[4:0]).
+ *
+ * The SPSR/SPSR_ELx layouts differ, and the below is intended to work with
+ * either format. Note: SPSR.J bit doesn't exist in SPSR_ELx, but this bit was
+ * obsoleted by the ARMv7 virtualization extensions and is RES0.
+ *
+ * For the SPSR layout seen from AArch32, see:
+ * - ARM DDI 0406C.d, page B1-1148
+ * - ARM DDI 0487E.a, page G8-6264
+ *
+ * For the SPSR_ELx layout for AArch32 seen from AArch64, see:
+ * - ARM DDI 0487E.a, page C5-426
+ *
+ * Here we manipulate the fields in order of the AArch32 SPSR_ELx layout, from
+ * MSB to LSB.
+ */
+static unsigned long get_except32_cpsr(struct kvm_vcpu *vcpu, u32 mode)
+{
+	u32 sctlr = __vcpu_read_sys_reg(vcpu, SCTLR_EL1);
+	unsigned long old, new;
+
+	old = *vcpu_cpsr(vcpu);
+	new = 0;
+
+	new |= (old & PSR_AA32_N_BIT);
+	new |= (old & PSR_AA32_Z_BIT);
+	new |= (old & PSR_AA32_C_BIT);
+	new |= (old & PSR_AA32_V_BIT);
+	new |= (old & PSR_AA32_Q_BIT);
+
+	// CPSR.IT[7:0] are set to zero upon any exception
+	// See ARM DDI 0487E.a, section G1.12.3
+	// See ARM DDI 0406C.d, section B1.8.3
+
+	new |= (old & PSR_AA32_DIT_BIT);
+
+	// CPSR.SSBS is set to SCTLR.DSSBS upon any exception
+	// See ARM DDI 0487E.a, page G8-6244
+	if (sctlr & BIT(31))
+		new |= PSR_AA32_SSBS_BIT;
+
+	// CPSR.PAN is unchanged unless SCTLR.SPAN == 0b0
+	// SCTLR.SPAN is RES1 when ARMv8.1-PAN is not implemented
+	// See ARM DDI 0487E.a, page G8-6246
+	new |= (old & PSR_AA32_PAN_BIT);
+	if (!(sctlr & BIT(23)))
+		new |= PSR_AA32_PAN_BIT;
+
+	// SS does not exist in AArch32, so ignore
+
+	// CPSR.IL is set to zero upon any exception
+	// See ARM DDI 0487E.a, page G1-5527
+
+	new |= (old & PSR_AA32_GE_MASK);
+
+	// CPSR.IT[7:0] are set to zero upon any exception
+	// See prior comment above
+
+	// CPSR.E is set to SCTLR.EE upon any exception
+	// See ARM DDI 0487E.a, page G8-6245
+	// See ARM DDI 0406C.d, page B4-1701
+	if (sctlr & BIT(25))
+		new |= PSR_AA32_E_BIT;
+
+	// CPSR.A is unchanged upon an exception to Undefined, Supervisor
+	// CPSR.A is set upon an exception to other modes
+	// See ARM DDI 0487E.a, pages G1-5515 to G1-5516
+	// See ARM DDI 0406C.d, page B1-1182
+	new |= (old & PSR_AA32_A_BIT);
+	if (mode != PSR_AA32_MODE_UND && mode != PSR_AA32_MODE_SVC)
+		new |= PSR_AA32_A_BIT;
+
+	// CPSR.I is set upon any exception
+	// See ARM DDI 0487E.a, pages G1-5515 to G1-5516
+	// See ARM DDI 0406C.d, page B1-1182
+	new |= PSR_AA32_I_BIT;
+
+	// CPSR.F is set upon an exception to FIQ
+	// CPSR.F is unchanged upon an exception to other modes
+	// See ARM DDI 0487E.a, pages G1-5515 to G1-5516
+	// See ARM DDI 0406C.d, page B1-1182
+	new |= (old & PSR_AA32_F_BIT);
+	if (mode == PSR_AA32_MODE_FIQ)
+		new |= PSR_AA32_F_BIT;
+
+	// CPSR.T is set to SCTLR.TE upon any exception
+	// See ARM DDI 0487E.a, page G8-5514
+	// See ARM DDI 0406C.d, page B1-1181
+	if (sctlr & BIT(30))
+		new |= PSR_AA32_T_BIT;
+
+	new |= mode;
+
+	return new;
+}
+
+/*
+ * Table taken from ARMv8 ARM DDI0487B-B, table G1-10.
+ */
+static const u8 return_offsets[8][2] = {
+	[0] = { 0, 0 },		/* Reset, unused */
+	[1] = { 4, 2 },		/* Undefined */
+	[2] = { 0, 0 },		/* SVC, unused */
+	[3] = { 4, 4 },		/* Prefetch abort */
+	[4] = { 8, 8 },		/* Data abort */
+	[5] = { 0, 0 },		/* HVC, unused */
+	[6] = { 4, 4 },		/* IRQ, unused */
+	[7] = { 4, 4 },		/* FIQ, unused */
+};
+
+static void enter_exception32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset)
+{
+	unsigned long spsr = *vcpu_cpsr(vcpu);
+	bool is_thumb = (spsr & PSR_AA32_T_BIT);
+	u32 sctlr = __vcpu_read_sys_reg(vcpu, SCTLR_EL1);
+	u32 return_address;
+
+	*vcpu_cpsr(vcpu) = get_except32_cpsr(vcpu, mode);
+	return_address   = *vcpu_pc(vcpu);
+	return_address  += return_offsets[vect_offset >> 2][is_thumb];
+
+	/* KVM only enters the ABT and UND modes, so only deal with those */
+	switch(mode) {
+	case PSR_AA32_MODE_ABT:
+		__vcpu_write_spsr_abt(vcpu, host_spsr_to_spsr32(spsr));
+		vcpu_gp_regs(vcpu)->compat_lr_abt = return_address;
+		break;
+
+	case PSR_AA32_MODE_UND:
+		__vcpu_write_spsr_und(vcpu, host_spsr_to_spsr32(spsr));
+		vcpu_gp_regs(vcpu)->compat_lr_und = return_address;
+		break;
+	}
+
+	/* Branch to exception vector */
+	if (sctlr & (1 << 13))
+		vect_offset += 0xffff0000;
+	else /* always have security exceptions */
+		vect_offset += __vcpu_read_sys_reg(vcpu, VBAR_EL1);
+
+	*vcpu_pc(vcpu) = vect_offset;
+}
+
+static void kvm_inject_exception(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_el1_is_32bit(vcpu)) {
+		switch (vcpu_get_flag(vcpu, EXCEPT_MASK)) {
+		case unpack_vcpu_flag(EXCEPT_AA32_UND):
+			enter_exception32(vcpu, PSR_AA32_MODE_UND, 4);
+			break;
+		case unpack_vcpu_flag(EXCEPT_AA32_IABT):
+			enter_exception32(vcpu, PSR_AA32_MODE_ABT, 12);
+			break;
+		case unpack_vcpu_flag(EXCEPT_AA32_DABT):
+			enter_exception32(vcpu, PSR_AA32_MODE_ABT, 16);
+			break;
+		default:
+			/* Err... */
+			break;
+		}
+	} else {
+		switch (vcpu_get_flag(vcpu, EXCEPT_MASK)) {
+		case unpack_vcpu_flag(EXCEPT_AA64_EL1_SYNC):
+			enter_exception64(vcpu, PSR_MODE_EL1h, except_type_sync);
+			break;
+		default:
+			/*
+			 * Only EL1_SYNC makes sense so far, EL2_{SYNC,IRQ}
+			 * will be implemented at some point. Everything
+			 * else gets silently ignored.
+			 */
+			break;
+		}
+	}
+}
+
+/*
+ * Adjust the guest PC (and potentially exception state) depending on
+ * flags provided by the emulation code.
+ */
+void __kvm_adjust_pc(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_get_flag(vcpu, PENDING_EXCEPTION)) {
+		kvm_inject_exception(vcpu);
+		vcpu_clear_flag(vcpu, PENDING_EXCEPTION);
+		vcpu_clear_flag(vcpu, EXCEPT_MASK);
+	} else if (vcpu_get_flag(vcpu, INCREMENT_PC)) {
+		kvm_skip_instr(vcpu);
+		vcpu_clear_flag(vcpu, INCREMENT_PC);
+	}
+}
diff --git a/arch/arm64/kvm/hyp/fpsimd.S b/arch/arm64/kvm/hyp/fpsimd.S
new file mode 100644
index 000000000..61e6f3ba7
--- /dev/null
+++ b/arch/arm64/kvm/hyp/fpsimd.S
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/fpsimdmacros.h>
+
+	.text
+
+SYM_FUNC_START(__fpsimd_save_state)
+	fpsimd_save	x0, 1
+	ret
+SYM_FUNC_END(__fpsimd_save_state)
+
+SYM_FUNC_START(__fpsimd_restore_state)
+	fpsimd_restore	x0, 1
+	ret
+SYM_FUNC_END(__fpsimd_restore_state)
+
+SYM_FUNC_START(__sve_restore_state)
+	mov	x2, #1
+	sve_load 0, x1, x2, 3
+	ret
+SYM_FUNC_END(__sve_restore_state)
diff --git a/arch/arm64/kvm/hyp/hyp-constants.c b/arch/arm64/kvm/hyp/hyp-constants.c
new file mode 100644
index 000000000..b3742a669
--- /dev/null
+++ b/arch/arm64/kvm/hyp/hyp-constants.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/kbuild.h>
+#include <nvhe/memory.h>
+
+int main(void)
+{
+	DEFINE(STRUCT_HYP_PAGE_SIZE,	sizeof(struct hyp_page));
+	return 0;
+}
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
new file mode 100644
index 000000000..8f3f93fa1
--- /dev/null
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -0,0 +1,256 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015-2018 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/linkage.h>
+
+#include <asm/alternative.h>
+#include <asm/assembler.h>
+#include <asm/cpufeature.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/mmu.h>
+#include <asm/spectre.h>
+
+.macro save_caller_saved_regs_vect
+	/* x0 and x1 were saved in the vector entry */
+	stp	x2, x3,   [sp, #-16]!
+	stp	x4, x5,   [sp, #-16]!
+	stp	x6, x7,   [sp, #-16]!
+	stp	x8, x9,   [sp, #-16]!
+	stp	x10, x11, [sp, #-16]!
+	stp	x12, x13, [sp, #-16]!
+	stp	x14, x15, [sp, #-16]!
+	stp	x16, x17, [sp, #-16]!
+.endm
+
+.macro restore_caller_saved_regs_vect
+	ldp	x16, x17, [sp], #16
+	ldp	x14, x15, [sp], #16
+	ldp	x12, x13, [sp], #16
+	ldp	x10, x11, [sp], #16
+	ldp	x8, x9,   [sp], #16
+	ldp	x6, x7,   [sp], #16
+	ldp	x4, x5,   [sp], #16
+	ldp	x2, x3,   [sp], #16
+	ldp	x0, x1,   [sp], #16
+.endm
+
+	.text
+
+el1_sync:				// Guest trapped into EL2
+
+	mrs	x0, esr_el2
+	ubfx	x0, x0, #ESR_ELx_EC_SHIFT, #ESR_ELx_EC_WIDTH
+	cmp	x0, #ESR_ELx_EC_HVC64
+	ccmp	x0, #ESR_ELx_EC_HVC32, #4, ne
+	b.ne	el1_trap
+
+	/*
+	 * Fastest possible path for ARM_SMCCC_ARCH_WORKAROUND_1.
+	 * The workaround has already been applied on the host,
+	 * so let's quickly get back to the guest. We don't bother
+	 * restoring x1, as it can be clobbered anyway.
+	 */
+	ldr	x1, [sp]				// Guest's x0
+	eor	w1, w1, #ARM_SMCCC_ARCH_WORKAROUND_1
+	cbz	w1, wa_epilogue
+
+	/* ARM_SMCCC_ARCH_WORKAROUND_2 handling */
+	eor	w1, w1, #(ARM_SMCCC_ARCH_WORKAROUND_1 ^ \
+			  ARM_SMCCC_ARCH_WORKAROUND_2)
+	cbz	w1, wa_epilogue
+
+	eor	w1, w1, #(ARM_SMCCC_ARCH_WORKAROUND_2 ^ \
+			  ARM_SMCCC_ARCH_WORKAROUND_3)
+	cbnz	w1, el1_trap
+
+wa_epilogue:
+	mov	x0, xzr
+	add	sp, sp, #16
+	eret
+	sb
+
+el1_trap:
+	get_vcpu_ptr	x1, x0
+	mov	x0, #ARM_EXCEPTION_TRAP
+	b	__guest_exit
+
+el1_irq:
+el1_fiq:
+	get_vcpu_ptr	x1, x0
+	mov	x0, #ARM_EXCEPTION_IRQ
+	b	__guest_exit
+
+el1_error:
+	get_vcpu_ptr	x1, x0
+	mov	x0, #ARM_EXCEPTION_EL1_SERROR
+	b	__guest_exit
+
+el2_sync:
+	/* Check for illegal exception return */
+	mrs	x0, spsr_el2
+	tbnz	x0, #20, 1f
+
+	save_caller_saved_regs_vect
+	stp     x29, x30, [sp, #-16]!
+	bl	kvm_unexpected_el2_exception
+	ldp     x29, x30, [sp], #16
+	restore_caller_saved_regs_vect
+
+	eret
+
+1:
+	/* Let's attempt a recovery from the illegal exception return */
+	get_vcpu_ptr	x1, x0
+	mov	x0, #ARM_EXCEPTION_IL
+	b	__guest_exit
+
+
+el2_error:
+	save_caller_saved_regs_vect
+	stp     x29, x30, [sp, #-16]!
+
+	bl	kvm_unexpected_el2_exception
+
+	ldp     x29, x30, [sp], #16
+	restore_caller_saved_regs_vect
+
+	eret
+	sb
+
+.macro invalid_vector	label, target = __guest_exit_panic
+	.align	2
+SYM_CODE_START_LOCAL(\label)
+	b \target
+SYM_CODE_END(\label)
+.endm
+
+	/* None of these should ever happen */
+	invalid_vector	el2t_sync_invalid
+	invalid_vector	el2t_irq_invalid
+	invalid_vector	el2t_fiq_invalid
+	invalid_vector	el2t_error_invalid
+	invalid_vector	el2h_irq_invalid
+	invalid_vector	el2h_fiq_invalid
+
+	.ltorg
+
+	.align 11
+
+.macro check_preamble_length start, end
+/* kvm_patch_vector_branch() generates code that jumps over the preamble. */
+.if ((\end-\start) != KVM_VECTOR_PREAMBLE)
+	.error "KVM vector preamble length mismatch"
+.endif
+.endm
+
+.macro valid_vect target
+	.align 7
+661:
+	esb
+	stp	x0, x1, [sp, #-16]!
+662:
+	b	\target
+
+check_preamble_length 661b, 662b
+.endm
+
+.macro invalid_vect target
+	.align 7
+661:
+	nop
+	stp	x0, x1, [sp, #-16]!
+662:
+	b	\target
+
+check_preamble_length 661b, 662b
+.endm
+
+SYM_CODE_START(__kvm_hyp_vector)
+	invalid_vect	el2t_sync_invalid	// Synchronous EL2t
+	invalid_vect	el2t_irq_invalid	// IRQ EL2t
+	invalid_vect	el2t_fiq_invalid	// FIQ EL2t
+	invalid_vect	el2t_error_invalid	// Error EL2t
+
+	valid_vect	el2_sync		// Synchronous EL2h
+	invalid_vect	el2h_irq_invalid	// IRQ EL2h
+	invalid_vect	el2h_fiq_invalid	// FIQ EL2h
+	valid_vect	el2_error		// Error EL2h
+
+	valid_vect	el1_sync		// Synchronous 64-bit EL1
+	valid_vect	el1_irq			// IRQ 64-bit EL1
+	valid_vect	el1_fiq			// FIQ 64-bit EL1
+	valid_vect	el1_error		// Error 64-bit EL1
+
+	valid_vect	el1_sync		// Synchronous 32-bit EL1
+	valid_vect	el1_irq			// IRQ 32-bit EL1
+	valid_vect	el1_fiq			// FIQ 32-bit EL1
+	valid_vect	el1_error		// Error 32-bit EL1
+SYM_CODE_END(__kvm_hyp_vector)
+
+.macro spectrev2_smccc_wa1_smc
+	sub	sp, sp, #(8 * 4)
+	stp	x2, x3, [sp, #(8 * 0)]
+	stp	x0, x1, [sp, #(8 * 2)]
+	alternative_cb ARM64_ALWAYS_SYSTEM, spectre_bhb_patch_wa3
+	/* Patched to mov WA3 when supported */
+	mov	w0, #ARM_SMCCC_ARCH_WORKAROUND_1
+	alternative_cb_end
+	smc	#0
+	ldp	x2, x3, [sp, #(8 * 0)]
+	add	sp, sp, #(8 * 2)
+.endm
+
+.macro hyp_ventry	indirect, spectrev2
+	.align	7
+1:	esb
+	.if \spectrev2 != 0
+	spectrev2_smccc_wa1_smc
+	.else
+	stp	x0, x1, [sp, #-16]!
+	mitigate_spectre_bhb_loop	x0
+	mitigate_spectre_bhb_clear_insn
+	.endif
+	.if \indirect != 0
+	alternative_cb ARM64_ALWAYS_SYSTEM, kvm_patch_vector_branch
+	/*
+	 * For ARM64_SPECTRE_V3A configurations, these NOPs get replaced with:
+	 *
+	 * movz	x0, #(addr & 0xffff)
+	 * movk	x0, #((addr >> 16) & 0xffff), lsl #16
+	 * movk	x0, #((addr >> 32) & 0xffff), lsl #32
+	 * br	x0
+	 *
+	 * Where:
+	 * addr = kern_hyp_va(__kvm_hyp_vector) + vector-offset + KVM_VECTOR_PREAMBLE.
+	 * See kvm_patch_vector_branch for details.
+	 */
+	nop
+	nop
+	nop
+	nop
+	alternative_cb_end
+	.endif
+	b	__kvm_hyp_vector + (1b - 0b + KVM_VECTOR_PREAMBLE)
+.endm
+
+.macro generate_vectors	indirect, spectrev2
+0:
+	.rept 16
+	hyp_ventry	\indirect, \spectrev2
+	.endr
+	.org 0b + SZ_2K		// Safety measure
+.endm
+
+	.align	11
+SYM_CODE_START(__bp_harden_hyp_vecs)
+	generate_vectors indirect = 0, spectrev2 = 1 // HYP_VECTOR_SPECTRE_DIRECT
+	generate_vectors indirect = 1, spectrev2 = 0 // HYP_VECTOR_INDIRECT
+	generate_vectors indirect = 1, spectrev2 = 1 // HYP_VECTOR_SPECTRE_INDIRECT
+1:	.org __bp_harden_hyp_vecs + __BP_HARDEN_HYP_VECS_SZ
+	.org 1b
+SYM_CODE_END(__bp_harden_hyp_vecs)
diff --git a/arch/arm64/kvm/hyp/include/hyp/adjust_pc.h b/arch/arm64/kvm/hyp/include/hyp/adjust_pc.h
new file mode 100644
index 000000000..4fdfeabef
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/hyp/adjust_pc.h
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Guest PC manipulation helpers
+ *
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Copyright (C) 2020 - Google LLC
+ * Author: Marc Zyngier <maz@kernel.org>
+ */
+
+#ifndef __ARM64_KVM_HYP_ADJUST_PC_H__
+#define __ARM64_KVM_HYP_ADJUST_PC_H__
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_host.h>
+
+static inline void kvm_skip_instr(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_mode_is_32bit(vcpu)) {
+		kvm_skip_instr32(vcpu);
+	} else {
+		*vcpu_pc(vcpu) += 4;
+		*vcpu_cpsr(vcpu) &= ~PSR_BTYPE_MASK;
+	}
+
+	/* advance the singlestep state machine */
+	*vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS;
+}
+
+/*
+ * Skip an instruction which has been emulated at hyp while most guest sysregs
+ * are live.
+ */
+static inline void __kvm_skip_instr(struct kvm_vcpu *vcpu)
+{
+	*vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR);
+	vcpu_gp_regs(vcpu)->pstate = read_sysreg_el2(SYS_SPSR);
+
+	kvm_skip_instr(vcpu);
+
+	write_sysreg_el2(vcpu_gp_regs(vcpu)->pstate, SYS_SPSR);
+	write_sysreg_el2(*vcpu_pc(vcpu), SYS_ELR);
+}
+
+/*
+ * Skip an instruction while host sysregs are live.
+ * Assumes host is always 64-bit.
+ */
+static inline void kvm_skip_host_instr(void)
+{
+	write_sysreg_el2(read_sysreg_el2(SYS_ELR) + 4, SYS_ELR);
+}
+
+#endif
diff --git a/arch/arm64/kvm/hyp/include/hyp/debug-sr.h b/arch/arm64/kvm/hyp/include/hyp/debug-sr.h
new file mode 100644
index 000000000..961bbef10
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/hyp/debug-sr.h
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#ifndef __ARM64_KVM_HYP_DEBUG_SR_H__
+#define __ARM64_KVM_HYP_DEBUG_SR_H__
+
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/debug-monitors.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+#define read_debug(r,n)		read_sysreg(r##n##_el1)
+#define write_debug(v,r,n)	write_sysreg(v, r##n##_el1)
+
+#define save_debug(ptr,reg,nr)						\
+	switch (nr) {							\
+	case 15:	ptr[15] = read_debug(reg, 15);			\
+			fallthrough;					\
+	case 14:	ptr[14] = read_debug(reg, 14);			\
+			fallthrough;					\
+	case 13:	ptr[13] = read_debug(reg, 13);			\
+			fallthrough;					\
+	case 12:	ptr[12] = read_debug(reg, 12);			\
+			fallthrough;					\
+	case 11:	ptr[11] = read_debug(reg, 11);			\
+			fallthrough;					\
+	case 10:	ptr[10] = read_debug(reg, 10);			\
+			fallthrough;					\
+	case 9:		ptr[9] = read_debug(reg, 9);			\
+			fallthrough;					\
+	case 8:		ptr[8] = read_debug(reg, 8);			\
+			fallthrough;					\
+	case 7:		ptr[7] = read_debug(reg, 7);			\
+			fallthrough;					\
+	case 6:		ptr[6] = read_debug(reg, 6);			\
+			fallthrough;					\
+	case 5:		ptr[5] = read_debug(reg, 5);			\
+			fallthrough;					\
+	case 4:		ptr[4] = read_debug(reg, 4);			\
+			fallthrough;					\
+	case 3:		ptr[3] = read_debug(reg, 3);			\
+			fallthrough;					\
+	case 2:		ptr[2] = read_debug(reg, 2);			\
+			fallthrough;					\
+	case 1:		ptr[1] = read_debug(reg, 1);			\
+			fallthrough;					\
+	default:	ptr[0] = read_debug(reg, 0);			\
+	}
+
+#define restore_debug(ptr,reg,nr)					\
+	switch (nr) {							\
+	case 15:	write_debug(ptr[15], reg, 15);			\
+			fallthrough;					\
+	case 14:	write_debug(ptr[14], reg, 14);			\
+			fallthrough;					\
+	case 13:	write_debug(ptr[13], reg, 13);			\
+			fallthrough;					\
+	case 12:	write_debug(ptr[12], reg, 12);			\
+			fallthrough;					\
+	case 11:	write_debug(ptr[11], reg, 11);			\
+			fallthrough;					\
+	case 10:	write_debug(ptr[10], reg, 10);			\
+			fallthrough;					\
+	case 9:		write_debug(ptr[9], reg, 9);			\
+			fallthrough;					\
+	case 8:		write_debug(ptr[8], reg, 8);			\
+			fallthrough;					\
+	case 7:		write_debug(ptr[7], reg, 7);			\
+			fallthrough;					\
+	case 6:		write_debug(ptr[6], reg, 6);			\
+			fallthrough;					\
+	case 5:		write_debug(ptr[5], reg, 5);			\
+			fallthrough;					\
+	case 4:		write_debug(ptr[4], reg, 4);			\
+			fallthrough;					\
+	case 3:		write_debug(ptr[3], reg, 3);			\
+			fallthrough;					\
+	case 2:		write_debug(ptr[2], reg, 2);			\
+			fallthrough;					\
+	case 1:		write_debug(ptr[1], reg, 1);			\
+			fallthrough;					\
+	default:	write_debug(ptr[0], reg, 0);			\
+	}
+
+static void __debug_save_state(struct kvm_guest_debug_arch *dbg,
+			       struct kvm_cpu_context *ctxt)
+{
+	u64 aa64dfr0;
+	int brps, wrps;
+
+	aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
+	brps = (aa64dfr0 >> 12) & 0xf;
+	wrps = (aa64dfr0 >> 20) & 0xf;
+
+	save_debug(dbg->dbg_bcr, dbgbcr, brps);
+	save_debug(dbg->dbg_bvr, dbgbvr, brps);
+	save_debug(dbg->dbg_wcr, dbgwcr, wrps);
+	save_debug(dbg->dbg_wvr, dbgwvr, wrps);
+
+	ctxt_sys_reg(ctxt, MDCCINT_EL1) = read_sysreg(mdccint_el1);
+}
+
+static void __debug_restore_state(struct kvm_guest_debug_arch *dbg,
+				  struct kvm_cpu_context *ctxt)
+{
+	u64 aa64dfr0;
+	int brps, wrps;
+
+	aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
+
+	brps = (aa64dfr0 >> 12) & 0xf;
+	wrps = (aa64dfr0 >> 20) & 0xf;
+
+	restore_debug(dbg->dbg_bcr, dbgbcr, brps);
+	restore_debug(dbg->dbg_bvr, dbgbvr, brps);
+	restore_debug(dbg->dbg_wcr, dbgwcr, wrps);
+	restore_debug(dbg->dbg_wvr, dbgwvr, wrps);
+
+	write_sysreg(ctxt_sys_reg(ctxt, MDCCINT_EL1), mdccint_el1);
+}
+
+static inline void __debug_switch_to_guest_common(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpu_context *host_ctxt;
+	struct kvm_cpu_context *guest_ctxt;
+	struct kvm_guest_debug_arch *host_dbg;
+	struct kvm_guest_debug_arch *guest_dbg;
+
+	if (!vcpu_get_flag(vcpu, DEBUG_DIRTY))
+		return;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	guest_ctxt = &vcpu->arch.ctxt;
+	host_dbg = &vcpu->arch.host_debug_state.regs;
+	guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);
+
+	__debug_save_state(host_dbg, host_ctxt);
+	__debug_restore_state(guest_dbg, guest_ctxt);
+}
+
+static inline void __debug_switch_to_host_common(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpu_context *host_ctxt;
+	struct kvm_cpu_context *guest_ctxt;
+	struct kvm_guest_debug_arch *host_dbg;
+	struct kvm_guest_debug_arch *guest_dbg;
+
+	if (!vcpu_get_flag(vcpu, DEBUG_DIRTY))
+		return;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	guest_ctxt = &vcpu->arch.ctxt;
+	host_dbg = &vcpu->arch.host_debug_state.regs;
+	guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);
+
+	__debug_save_state(guest_dbg, guest_ctxt);
+	__debug_restore_state(host_dbg, host_ctxt);
+
+	vcpu_clear_flag(vcpu, DEBUG_DIRTY);
+}
+
+#endif /* __ARM64_KVM_HYP_DEBUG_SR_H__ */
diff --git a/arch/arm64/kvm/hyp/include/hyp/fault.h b/arch/arm64/kvm/hyp/include/hyp/fault.h
new file mode 100644
index 000000000..1b8a2dcd7
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/hyp/fault.h
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#ifndef __ARM64_KVM_HYP_FAULT_H__
+#define __ARM64_KVM_HYP_FAULT_H__
+
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+static inline bool __translate_far_to_hpfar(u64 far, u64 *hpfar)
+{
+	u64 par, tmp;
+
+	/*
+	 * Resolve the IPA the hard way using the guest VA.
+	 *
+	 * Stage-1 translation already validated the memory access
+	 * rights. As such, we can use the EL1 translation regime, and
+	 * don't have to distinguish between EL0 and EL1 access.
+	 *
+	 * We do need to save/restore PAR_EL1 though, as we haven't
+	 * saved the guest context yet, and we may return early...
+	 */
+	par = read_sysreg_par();
+	if (!__kvm_at("s1e1r", far))
+		tmp = read_sysreg_par();
+	else
+		tmp = SYS_PAR_EL1_F; /* back to the guest */
+	write_sysreg(par, par_el1);
+
+	if (unlikely(tmp & SYS_PAR_EL1_F))
+		return false; /* Translation failed, back to guest */
+
+	/* Convert PAR to HPFAR format */
+	*hpfar = PAR_TO_HPFAR(tmp);
+	return true;
+}
+
+static inline bool __get_fault_info(u64 esr, struct kvm_vcpu_fault_info *fault)
+{
+	u64 hpfar, far;
+
+	far = read_sysreg_el2(SYS_FAR);
+
+	/*
+	 * The HPFAR can be invalid if the stage 2 fault did not
+	 * happen during a stage 1 page table walk (the ESR_EL2.S1PTW
+	 * bit is clear) and one of the two following cases are true:
+	 *   1. The fault was due to a permission fault
+	 *   2. The processor carries errata 834220
+	 *
+	 * Therefore, for all non S1PTW faults where we either have a
+	 * permission fault or the errata workaround is enabled, we
+	 * resolve the IPA using the AT instruction.
+	 */
+	if (!(esr & ESR_ELx_S1PTW) &&
+	    (cpus_have_final_cap(ARM64_WORKAROUND_834220) ||
+	     (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
+		if (!__translate_far_to_hpfar(far, &hpfar))
+			return false;
+	} else {
+		hpfar = read_sysreg(hpfar_el2);
+	}
+
+	fault->far_el2 = far;
+	fault->hpfar_el2 = hpfar;
+	return true;
+}
+
+#endif
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
new file mode 100644
index 000000000..081aca8f4
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -0,0 +1,533 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#ifndef __ARM64_KVM_HYP_SWITCH_H__
+#define __ARM64_KVM_HYP_SWITCH_H__
+
+#include <hyp/adjust_pc.h>
+#include <hyp/fault.h>
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+#include <linux/types.h>
+#include <linux/jump_label.h>
+#include <uapi/linux/psci.h>
+
+#include <kvm/arm_psci.h>
+
+#include <asm/barrier.h>
+#include <asm/cpufeature.h>
+#include <asm/extable.h>
+#include <asm/kprobes.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/fpsimd.h>
+#include <asm/debug-monitors.h>
+#include <asm/processor.h>
+
+struct kvm_exception_table_entry {
+	int insn, fixup;
+};
+
+extern struct kvm_exception_table_entry __start___kvm_ex_table;
+extern struct kvm_exception_table_entry __stop___kvm_ex_table;
+
+/* Check whether the FP regs are owned by the guest */
+static inline bool guest_owns_fp_regs(struct kvm_vcpu *vcpu)
+{
+	return vcpu->arch.fp_state == FP_STATE_GUEST_OWNED;
+}
+
+/* Save the 32-bit only FPSIMD system register state */
+static inline void __fpsimd_save_fpexc32(struct kvm_vcpu *vcpu)
+{
+	if (!vcpu_el1_is_32bit(vcpu))
+		return;
+
+	__vcpu_sys_reg(vcpu, FPEXC32_EL2) = read_sysreg(fpexc32_el2);
+}
+
+static inline void __activate_traps_fpsimd32(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * We are about to set CPTR_EL2.TFP to trap all floating point
+	 * register accesses to EL2, however, the ARM ARM clearly states that
+	 * traps are only taken to EL2 if the operation would not otherwise
+	 * trap to EL1.  Therefore, always make sure that for 32-bit guests,
+	 * we set FPEXC.EN to prevent traps to EL1, when setting the TFP bit.
+	 * If FP/ASIMD is not implemented, FPEXC is UNDEFINED and any access to
+	 * it will cause an exception.
+	 */
+	if (vcpu_el1_is_32bit(vcpu) && system_supports_fpsimd()) {
+		write_sysreg(1 << 30, fpexc32_el2);
+		isb();
+	}
+}
+
+static inline void __activate_traps_common(struct kvm_vcpu *vcpu)
+{
+	/* Trap on AArch32 cp15 c15 (impdef sysregs) accesses (EL1 or EL0) */
+	write_sysreg(1 << 15, hstr_el2);
+
+	/*
+	 * Make sure we trap PMU access from EL0 to EL2. Also sanitize
+	 * PMSELR_EL0 to make sure it never contains the cycle
+	 * counter, which could make a PMXEVCNTR_EL0 access UNDEF at
+	 * EL1 instead of being trapped to EL2.
+	 */
+	if (kvm_arm_support_pmu_v3()) {
+		struct kvm_cpu_context *hctxt;
+
+		write_sysreg(0, pmselr_el0);
+
+		hctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+		ctxt_sys_reg(hctxt, PMUSERENR_EL0) = read_sysreg(pmuserenr_el0);
+		write_sysreg(ARMV8_PMU_USERENR_MASK, pmuserenr_el0);
+	}
+
+	vcpu->arch.mdcr_el2_host = read_sysreg(mdcr_el2);
+	write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
+
+	if (cpus_have_final_cap(ARM64_SME)) {
+		sysreg_clear_set_s(SYS_HFGRTR_EL2,
+				   HFGxTR_EL2_nSMPRI_EL1_MASK |
+				   HFGxTR_EL2_nTPIDR2_EL0_MASK,
+				   0);
+		sysreg_clear_set_s(SYS_HFGWTR_EL2,
+				   HFGxTR_EL2_nSMPRI_EL1_MASK |
+				   HFGxTR_EL2_nTPIDR2_EL0_MASK,
+				   0);
+	}
+}
+
+static inline void __deactivate_traps_common(struct kvm_vcpu *vcpu)
+{
+	write_sysreg(vcpu->arch.mdcr_el2_host, mdcr_el2);
+
+	write_sysreg(0, hstr_el2);
+	if (kvm_arm_support_pmu_v3()) {
+		struct kvm_cpu_context *hctxt;
+
+		hctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+		write_sysreg(ctxt_sys_reg(hctxt, PMUSERENR_EL0), pmuserenr_el0);
+	}
+
+	if (cpus_have_final_cap(ARM64_SME)) {
+		sysreg_clear_set_s(SYS_HFGRTR_EL2, 0,
+				   HFGxTR_EL2_nSMPRI_EL1_MASK |
+				   HFGxTR_EL2_nTPIDR2_EL0_MASK);
+		sysreg_clear_set_s(SYS_HFGWTR_EL2, 0,
+				   HFGxTR_EL2_nSMPRI_EL1_MASK |
+				   HFGxTR_EL2_nTPIDR2_EL0_MASK);
+	}
+}
+
+static inline void ___activate_traps(struct kvm_vcpu *vcpu)
+{
+	u64 hcr = vcpu->arch.hcr_el2;
+
+	if (cpus_have_final_cap(ARM64_WORKAROUND_CAVIUM_TX2_219_TVM))
+		hcr |= HCR_TVM;
+
+	write_sysreg(hcr, hcr_el2);
+
+	if (cpus_have_final_cap(ARM64_HAS_RAS_EXTN) && (hcr & HCR_VSE))
+		write_sysreg_s(vcpu->arch.vsesr_el2, SYS_VSESR_EL2);
+}
+
+static inline void ___deactivate_traps(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * If we pended a virtual abort, preserve it until it gets
+	 * cleared. See D1.14.3 (Virtual Interrupts) for details, but
+	 * the crucial bit is "On taking a vSError interrupt,
+	 * HCR_EL2.VSE is cleared to 0."
+	 */
+	if (vcpu->arch.hcr_el2 & HCR_VSE) {
+		vcpu->arch.hcr_el2 &= ~HCR_VSE;
+		vcpu->arch.hcr_el2 |= read_sysreg(hcr_el2) & HCR_VSE;
+	}
+}
+
+static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
+{
+	return __get_fault_info(vcpu->arch.fault.esr_el2, &vcpu->arch.fault);
+}
+
+static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu)
+{
+	sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
+	__sve_restore_state(vcpu_sve_pffr(vcpu),
+			    &vcpu->arch.ctxt.fp_regs.fpsr);
+	write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR);
+}
+
+/*
+ * We trap the first access to the FP/SIMD to save the host context and
+ * restore the guest context lazily.
+ * If FP/SIMD is not implemented, handle the trap and inject an undefined
+ * instruction exception to the guest. Similarly for trapped SVE accesses.
+ */
+static bool kvm_hyp_handle_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	bool sve_guest;
+	u8 esr_ec;
+	u64 reg;
+
+	if (!system_supports_fpsimd())
+		return false;
+
+	sve_guest = vcpu_has_sve(vcpu);
+	esr_ec = kvm_vcpu_trap_get_class(vcpu);
+
+	/* Don't handle SVE traps for non-SVE vcpus here: */
+	if (!sve_guest && esr_ec != ESR_ELx_EC_FP_ASIMD)
+		return false;
+
+	/* Valid trap.  Switch the context: */
+
+	/* First disable enough traps to allow us to update the registers */
+	if (has_vhe()) {
+		reg = CPACR_EL1_FPEN_EL0EN | CPACR_EL1_FPEN_EL1EN;
+		if (sve_guest)
+			reg |= CPACR_EL1_ZEN_EL0EN | CPACR_EL1_ZEN_EL1EN;
+
+		sysreg_clear_set(cpacr_el1, 0, reg);
+	} else {
+		reg = CPTR_EL2_TFP;
+		if (sve_guest)
+			reg |= CPTR_EL2_TZ;
+
+		sysreg_clear_set(cptr_el2, reg, 0);
+	}
+	isb();
+
+	/* Write out the host state if it's in the registers */
+	if (vcpu->arch.fp_state == FP_STATE_HOST_OWNED)
+		__fpsimd_save_state(vcpu->arch.host_fpsimd_state);
+
+	/* Restore the guest state */
+	if (sve_guest)
+		__hyp_sve_restore_guest(vcpu);
+	else
+		__fpsimd_restore_state(&vcpu->arch.ctxt.fp_regs);
+
+	/* Skip restoring fpexc32 for AArch64 guests */
+	if (!(read_sysreg(hcr_el2) & HCR_RW))
+		write_sysreg(__vcpu_sys_reg(vcpu, FPEXC32_EL2), fpexc32_el2);
+
+	vcpu->arch.fp_state = FP_STATE_GUEST_OWNED;
+
+	return true;
+}
+
+static inline bool handle_tx2_tvm(struct kvm_vcpu *vcpu)
+{
+	u32 sysreg = esr_sys64_to_sysreg(kvm_vcpu_get_esr(vcpu));
+	int rt = kvm_vcpu_sys_get_rt(vcpu);
+	u64 val = vcpu_get_reg(vcpu, rt);
+
+	/*
+	 * The normal sysreg handling code expects to see the traps,
+	 * let's not do anything here.
+	 */
+	if (vcpu->arch.hcr_el2 & HCR_TVM)
+		return false;
+
+	switch (sysreg) {
+	case SYS_SCTLR_EL1:
+		write_sysreg_el1(val, SYS_SCTLR);
+		break;
+	case SYS_TTBR0_EL1:
+		write_sysreg_el1(val, SYS_TTBR0);
+		break;
+	case SYS_TTBR1_EL1:
+		write_sysreg_el1(val, SYS_TTBR1);
+		break;
+	case SYS_TCR_EL1:
+		write_sysreg_el1(val, SYS_TCR);
+		break;
+	case SYS_ESR_EL1:
+		write_sysreg_el1(val, SYS_ESR);
+		break;
+	case SYS_FAR_EL1:
+		write_sysreg_el1(val, SYS_FAR);
+		break;
+	case SYS_AFSR0_EL1:
+		write_sysreg_el1(val, SYS_AFSR0);
+		break;
+	case SYS_AFSR1_EL1:
+		write_sysreg_el1(val, SYS_AFSR1);
+		break;
+	case SYS_MAIR_EL1:
+		write_sysreg_el1(val, SYS_MAIR);
+		break;
+	case SYS_AMAIR_EL1:
+		write_sysreg_el1(val, SYS_AMAIR);
+		break;
+	case SYS_CONTEXTIDR_EL1:
+		write_sysreg_el1(val, SYS_CONTEXTIDR);
+		break;
+	default:
+		return false;
+	}
+
+	__kvm_skip_instr(vcpu);
+	return true;
+}
+
+static inline bool esr_is_ptrauth_trap(u64 esr)
+{
+	switch (esr_sys64_to_sysreg(esr)) {
+	case SYS_APIAKEYLO_EL1:
+	case SYS_APIAKEYHI_EL1:
+	case SYS_APIBKEYLO_EL1:
+	case SYS_APIBKEYHI_EL1:
+	case SYS_APDAKEYLO_EL1:
+	case SYS_APDAKEYHI_EL1:
+	case SYS_APDBKEYLO_EL1:
+	case SYS_APDBKEYHI_EL1:
+	case SYS_APGAKEYLO_EL1:
+	case SYS_APGAKEYHI_EL1:
+		return true;
+	}
+
+	return false;
+}
+
+#define __ptrauth_save_key(ctxt, key)					\
+	do {								\
+	u64 __val;                                                      \
+	__val = read_sysreg_s(SYS_ ## key ## KEYLO_EL1);                \
+	ctxt_sys_reg(ctxt, key ## KEYLO_EL1) = __val;                   \
+	__val = read_sysreg_s(SYS_ ## key ## KEYHI_EL1);                \
+	ctxt_sys_reg(ctxt, key ## KEYHI_EL1) = __val;                   \
+} while(0)
+
+DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
+
+static bool kvm_hyp_handle_ptrauth(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	struct kvm_cpu_context *ctxt;
+	u64 val;
+
+	if (!vcpu_has_ptrauth(vcpu))
+		return false;
+
+	ctxt = this_cpu_ptr(&kvm_hyp_ctxt);
+	__ptrauth_save_key(ctxt, APIA);
+	__ptrauth_save_key(ctxt, APIB);
+	__ptrauth_save_key(ctxt, APDA);
+	__ptrauth_save_key(ctxt, APDB);
+	__ptrauth_save_key(ctxt, APGA);
+
+	vcpu_ptrauth_enable(vcpu);
+
+	val = read_sysreg(hcr_el2);
+	val |= (HCR_API | HCR_APK);
+	write_sysreg(val, hcr_el2);
+
+	return true;
+}
+
+static bool kvm_hyp_handle_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	if (cpus_have_final_cap(ARM64_WORKAROUND_CAVIUM_TX2_219_TVM) &&
+	    handle_tx2_tvm(vcpu))
+		return true;
+
+	if (static_branch_unlikely(&vgic_v3_cpuif_trap) &&
+	    __vgic_v3_perform_cpuif_access(vcpu) == 1)
+		return true;
+
+	if (esr_is_ptrauth_trap(kvm_vcpu_get_esr(vcpu)))
+		return kvm_hyp_handle_ptrauth(vcpu, exit_code);
+
+	return false;
+}
+
+static bool kvm_hyp_handle_cp15_32(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	if (static_branch_unlikely(&vgic_v3_cpuif_trap) &&
+	    __vgic_v3_perform_cpuif_access(vcpu) == 1)
+		return true;
+
+	return false;
+}
+
+static bool kvm_hyp_handle_memory_fault(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	if (!__populate_fault_info(vcpu))
+		return true;
+
+	return false;
+}
+static bool kvm_hyp_handle_iabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
+	__alias(kvm_hyp_handle_memory_fault);
+static bool kvm_hyp_handle_watchpt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
+	__alias(kvm_hyp_handle_memory_fault);
+
+static bool kvm_hyp_handle_dabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	if (kvm_hyp_handle_memory_fault(vcpu, exit_code))
+		return true;
+
+	if (static_branch_unlikely(&vgic_v2_cpuif_trap)) {
+		bool valid;
+
+		valid = kvm_vcpu_trap_get_fault_type(vcpu) == FSC_FAULT &&
+			kvm_vcpu_dabt_isvalid(vcpu) &&
+			!kvm_vcpu_abt_issea(vcpu) &&
+			!kvm_vcpu_abt_iss1tw(vcpu);
+
+		if (valid) {
+			int ret = __vgic_v2_perform_cpuif_access(vcpu);
+
+			if (ret == 1)
+				return true;
+
+			/* Promote an illegal access to an SError.*/
+			if (ret == -1)
+				*exit_code = ARM_EXCEPTION_EL1_SERROR;
+		}
+	}
+
+	return false;
+}
+
+typedef bool (*exit_handler_fn)(struct kvm_vcpu *, u64 *);
+
+static const exit_handler_fn *kvm_get_exit_handler_array(struct kvm_vcpu *vcpu);
+
+static void early_exit_filter(struct kvm_vcpu *vcpu, u64 *exit_code);
+
+/*
+ * Allow the hypervisor to handle the exit with an exit handler if it has one.
+ *
+ * Returns true if the hypervisor handled the exit, and control should go back
+ * to the guest, or false if it hasn't.
+ */
+static inline bool kvm_hyp_handle_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	const exit_handler_fn *handlers = kvm_get_exit_handler_array(vcpu);
+	exit_handler_fn fn;
+
+	fn = handlers[kvm_vcpu_trap_get_class(vcpu)];
+
+	if (fn)
+		return fn(vcpu, exit_code);
+
+	return false;
+}
+
+static inline void synchronize_vcpu_pstate(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	/*
+	 * Check for the conditions of Cortex-A510's #2077057. When these occur
+	 * SPSR_EL2 can't be trusted, but isn't needed either as it is
+	 * unchanged from the value in vcpu_gp_regs(vcpu)->pstate.
+	 * Are we single-stepping the guest, and took a PAC exception from the
+	 * active-not-pending state?
+	 */
+	if (cpus_have_final_cap(ARM64_WORKAROUND_2077057)		&&
+	    vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP			&&
+	    *vcpu_cpsr(vcpu) & DBG_SPSR_SS				&&
+	    ESR_ELx_EC(read_sysreg_el2(SYS_ESR)) == ESR_ELx_EC_PAC)
+		write_sysreg_el2(*vcpu_cpsr(vcpu), SYS_SPSR);
+
+	vcpu->arch.ctxt.regs.pstate = read_sysreg_el2(SYS_SPSR);
+}
+
+/*
+ * Return true when we were able to fixup the guest exit and should return to
+ * the guest, false when we should restore the host state and return to the
+ * main run loop.
+ */
+static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	/*
+	 * Save PSTATE early so that we can evaluate the vcpu mode
+	 * early on.
+	 */
+	synchronize_vcpu_pstate(vcpu, exit_code);
+
+	/*
+	 * Check whether we want to repaint the state one way or
+	 * another.
+	 */
+	early_exit_filter(vcpu, exit_code);
+
+	if (ARM_EXCEPTION_CODE(*exit_code) != ARM_EXCEPTION_IRQ)
+		vcpu->arch.fault.esr_el2 = read_sysreg_el2(SYS_ESR);
+
+	if (ARM_SERROR_PENDING(*exit_code) &&
+	    ARM_EXCEPTION_CODE(*exit_code) != ARM_EXCEPTION_IRQ) {
+		u8 esr_ec = kvm_vcpu_trap_get_class(vcpu);
+
+		/*
+		 * HVC already have an adjusted PC, which we need to
+		 * correct in order to return to after having injected
+		 * the SError.
+		 *
+		 * SMC, on the other hand, is *trapped*, meaning its
+		 * preferred return address is the SMC itself.
+		 */
+		if (esr_ec == ESR_ELx_EC_HVC32 || esr_ec == ESR_ELx_EC_HVC64)
+			write_sysreg_el2(read_sysreg_el2(SYS_ELR) - 4, SYS_ELR);
+	}
+
+	/*
+	 * We're using the raw exception code in order to only process
+	 * the trap if no SError is pending. We will come back to the
+	 * same PC once the SError has been injected, and replay the
+	 * trapping instruction.
+	 */
+	if (*exit_code != ARM_EXCEPTION_TRAP)
+		goto exit;
+
+	/* Check if there's an exit handler and allow it to handle the exit. */
+	if (kvm_hyp_handle_exit(vcpu, exit_code))
+		goto guest;
+exit:
+	/* Return to the host kernel and handle the exit */
+	return false;
+
+guest:
+	/* Re-enter the guest */
+	asm(ALTERNATIVE("nop", "dmb sy", ARM64_WORKAROUND_1508412));
+	return true;
+}
+
+static inline void __kvm_unexpected_el2_exception(void)
+{
+	extern char __guest_exit_panic[];
+	unsigned long addr, fixup;
+	struct kvm_exception_table_entry *entry, *end;
+	unsigned long elr_el2 = read_sysreg(elr_el2);
+
+	entry = &__start___kvm_ex_table;
+	end = &__stop___kvm_ex_table;
+
+	while (entry < end) {
+		addr = (unsigned long)&entry->insn + entry->insn;
+		fixup = (unsigned long)&entry->fixup + entry->fixup;
+
+		if (addr != elr_el2) {
+			entry++;
+			continue;
+		}
+
+		write_sysreg(fixup, elr_el2);
+		return;
+	}
+
+	/* Trigger a panic after restoring the hyp context. */
+	write_sysreg(__guest_exit_panic, elr_el2);
+}
+
+#endif /* __ARM64_KVM_HYP_SWITCH_H__ */
diff --git a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
new file mode 100644
index 000000000..baa5b9b3d
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#ifndef __ARM64_KVM_HYP_SYSREG_SR_H__
+#define __ARM64_KVM_HYP_SYSREG_SR_H__
+
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kprobes.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+static inline void __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
+{
+	ctxt_sys_reg(ctxt, MDSCR_EL1)	= read_sysreg(mdscr_el1);
+}
+
+static inline void __sysreg_save_user_state(struct kvm_cpu_context *ctxt)
+{
+	ctxt_sys_reg(ctxt, TPIDR_EL0)	= read_sysreg(tpidr_el0);
+	ctxt_sys_reg(ctxt, TPIDRRO_EL0)	= read_sysreg(tpidrro_el0);
+}
+
+static inline bool ctxt_has_mte(struct kvm_cpu_context *ctxt)
+{
+	struct kvm_vcpu *vcpu = ctxt->__hyp_running_vcpu;
+
+	if (!vcpu)
+		vcpu = container_of(ctxt, struct kvm_vcpu, arch.ctxt);
+
+	return kvm_has_mte(kern_hyp_va(vcpu->kvm));
+}
+
+static inline void __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
+{
+	ctxt_sys_reg(ctxt, CSSELR_EL1)	= read_sysreg(csselr_el1);
+	ctxt_sys_reg(ctxt, SCTLR_EL1)	= read_sysreg_el1(SYS_SCTLR);
+	ctxt_sys_reg(ctxt, CPACR_EL1)	= read_sysreg_el1(SYS_CPACR);
+	ctxt_sys_reg(ctxt, TTBR0_EL1)	= read_sysreg_el1(SYS_TTBR0);
+	ctxt_sys_reg(ctxt, TTBR1_EL1)	= read_sysreg_el1(SYS_TTBR1);
+	ctxt_sys_reg(ctxt, TCR_EL1)	= read_sysreg_el1(SYS_TCR);
+	ctxt_sys_reg(ctxt, ESR_EL1)	= read_sysreg_el1(SYS_ESR);
+	ctxt_sys_reg(ctxt, AFSR0_EL1)	= read_sysreg_el1(SYS_AFSR0);
+	ctxt_sys_reg(ctxt, AFSR1_EL1)	= read_sysreg_el1(SYS_AFSR1);
+	ctxt_sys_reg(ctxt, FAR_EL1)	= read_sysreg_el1(SYS_FAR);
+	ctxt_sys_reg(ctxt, MAIR_EL1)	= read_sysreg_el1(SYS_MAIR);
+	ctxt_sys_reg(ctxt, VBAR_EL1)	= read_sysreg_el1(SYS_VBAR);
+	ctxt_sys_reg(ctxt, CONTEXTIDR_EL1) = read_sysreg_el1(SYS_CONTEXTIDR);
+	ctxt_sys_reg(ctxt, AMAIR_EL1)	= read_sysreg_el1(SYS_AMAIR);
+	ctxt_sys_reg(ctxt, CNTKCTL_EL1)	= read_sysreg_el1(SYS_CNTKCTL);
+	ctxt_sys_reg(ctxt, PAR_EL1)	= read_sysreg_par();
+	ctxt_sys_reg(ctxt, TPIDR_EL1)	= read_sysreg(tpidr_el1);
+
+	if (ctxt_has_mte(ctxt)) {
+		ctxt_sys_reg(ctxt, TFSR_EL1) = read_sysreg_el1(SYS_TFSR);
+		ctxt_sys_reg(ctxt, TFSRE0_EL1) = read_sysreg_s(SYS_TFSRE0_EL1);
+	}
+
+	ctxt_sys_reg(ctxt, SP_EL1)	= read_sysreg(sp_el1);
+	ctxt_sys_reg(ctxt, ELR_EL1)	= read_sysreg_el1(SYS_ELR);
+	ctxt_sys_reg(ctxt, SPSR_EL1)	= read_sysreg_el1(SYS_SPSR);
+}
+
+static inline void __sysreg_save_el2_return_state(struct kvm_cpu_context *ctxt)
+{
+	ctxt->regs.pc			= read_sysreg_el2(SYS_ELR);
+	/*
+	 * Guest PSTATE gets saved at guest fixup time in all
+	 * cases. We still need to handle the nVHE host side here.
+	 */
+	if (!has_vhe() && ctxt->__hyp_running_vcpu)
+		ctxt->regs.pstate	= read_sysreg_el2(SYS_SPSR);
+
+	if (cpus_have_final_cap(ARM64_HAS_RAS_EXTN))
+		ctxt_sys_reg(ctxt, DISR_EL1) = read_sysreg_s(SYS_VDISR_EL2);
+}
+
+static inline void __sysreg_restore_common_state(struct kvm_cpu_context *ctxt)
+{
+	write_sysreg(ctxt_sys_reg(ctxt, MDSCR_EL1),  mdscr_el1);
+}
+
+static inline void __sysreg_restore_user_state(struct kvm_cpu_context *ctxt)
+{
+	write_sysreg(ctxt_sys_reg(ctxt, TPIDR_EL0),	tpidr_el0);
+	write_sysreg(ctxt_sys_reg(ctxt, TPIDRRO_EL0),	tpidrro_el0);
+}
+
+static inline void __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
+{
+	write_sysreg(ctxt_sys_reg(ctxt, MPIDR_EL1),	vmpidr_el2);
+	write_sysreg(ctxt_sys_reg(ctxt, CSSELR_EL1),	csselr_el1);
+
+	if (has_vhe() ||
+	    !cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
+		write_sysreg_el1(ctxt_sys_reg(ctxt, SCTLR_EL1),	SYS_SCTLR);
+		write_sysreg_el1(ctxt_sys_reg(ctxt, TCR_EL1),	SYS_TCR);
+	} else	if (!ctxt->__hyp_running_vcpu) {
+		/*
+		 * Must only be done for guest registers, hence the context
+		 * test. We're coming from the host, so SCTLR.M is already
+		 * set. Pairs with nVHE's __activate_traps().
+		 */
+		write_sysreg_el1((ctxt_sys_reg(ctxt, TCR_EL1) |
+				  TCR_EPD1_MASK | TCR_EPD0_MASK),
+				 SYS_TCR);
+		isb();
+	}
+
+	write_sysreg_el1(ctxt_sys_reg(ctxt, CPACR_EL1),	SYS_CPACR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, TTBR0_EL1),	SYS_TTBR0);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, TTBR1_EL1),	SYS_TTBR1);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, ESR_EL1),	SYS_ESR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, AFSR0_EL1),	SYS_AFSR0);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, AFSR1_EL1),	SYS_AFSR1);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, FAR_EL1),	SYS_FAR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, MAIR_EL1),	SYS_MAIR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, VBAR_EL1),	SYS_VBAR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, CONTEXTIDR_EL1), SYS_CONTEXTIDR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, AMAIR_EL1),	SYS_AMAIR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, CNTKCTL_EL1), SYS_CNTKCTL);
+	write_sysreg(ctxt_sys_reg(ctxt, PAR_EL1),	par_el1);
+	write_sysreg(ctxt_sys_reg(ctxt, TPIDR_EL1),	tpidr_el1);
+
+	if (ctxt_has_mte(ctxt)) {
+		write_sysreg_el1(ctxt_sys_reg(ctxt, TFSR_EL1), SYS_TFSR);
+		write_sysreg_s(ctxt_sys_reg(ctxt, TFSRE0_EL1), SYS_TFSRE0_EL1);
+	}
+
+	if (!has_vhe() &&
+	    cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT) &&
+	    ctxt->__hyp_running_vcpu) {
+		/*
+		 * Must only be done for host registers, hence the context
+		 * test. Pairs with nVHE's __deactivate_traps().
+		 */
+		isb();
+		/*
+		 * At this stage, and thanks to the above isb(), S2 is
+		 * deconfigured and disabled. We can now restore the host's
+		 * S1 configuration: SCTLR, and only then TCR.
+		 */
+		write_sysreg_el1(ctxt_sys_reg(ctxt, SCTLR_EL1),	SYS_SCTLR);
+		isb();
+		write_sysreg_el1(ctxt_sys_reg(ctxt, TCR_EL1),	SYS_TCR);
+	}
+
+	write_sysreg(ctxt_sys_reg(ctxt, SP_EL1),	sp_el1);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, ELR_EL1),	SYS_ELR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, SPSR_EL1),	SYS_SPSR);
+}
+
+static inline void __sysreg_restore_el2_return_state(struct kvm_cpu_context *ctxt)
+{
+	u64 pstate = ctxt->regs.pstate;
+	u64 mode = pstate & PSR_AA32_MODE_MASK;
+
+	/*
+	 * Safety check to ensure we're setting the CPU up to enter the guest
+	 * in a less privileged mode.
+	 *
+	 * If we are attempting a return to EL2 or higher in AArch64 state,
+	 * program SPSR_EL2 with M=EL2h and the IL bit set which ensures that
+	 * we'll take an illegal exception state exception immediately after
+	 * the ERET to the guest.  Attempts to return to AArch32 Hyp will
+	 * result in an illegal exception return because EL2's execution state
+	 * is determined by SCR_EL3.RW.
+	 */
+	if (!(mode & PSR_MODE32_BIT) && mode >= PSR_MODE_EL2t)
+		pstate = PSR_MODE_EL2h | PSR_IL_BIT;
+
+	write_sysreg_el2(ctxt->regs.pc,			SYS_ELR);
+	write_sysreg_el2(pstate,			SYS_SPSR);
+
+	if (cpus_have_final_cap(ARM64_HAS_RAS_EXTN))
+		write_sysreg_s(ctxt_sys_reg(ctxt, DISR_EL1), SYS_VDISR_EL2);
+}
+
+static inline void __sysreg32_save_state(struct kvm_vcpu *vcpu)
+{
+	if (!vcpu_el1_is_32bit(vcpu))
+		return;
+
+	vcpu->arch.ctxt.spsr_abt = read_sysreg(spsr_abt);
+	vcpu->arch.ctxt.spsr_und = read_sysreg(spsr_und);
+	vcpu->arch.ctxt.spsr_irq = read_sysreg(spsr_irq);
+	vcpu->arch.ctxt.spsr_fiq = read_sysreg(spsr_fiq);
+
+	__vcpu_sys_reg(vcpu, DACR32_EL2) = read_sysreg(dacr32_el2);
+	__vcpu_sys_reg(vcpu, IFSR32_EL2) = read_sysreg(ifsr32_el2);
+
+	if (has_vhe() || vcpu_get_flag(vcpu, DEBUG_DIRTY))
+		__vcpu_sys_reg(vcpu, DBGVCR32_EL2) = read_sysreg(dbgvcr32_el2);
+}
+
+static inline void __sysreg32_restore_state(struct kvm_vcpu *vcpu)
+{
+	if (!vcpu_el1_is_32bit(vcpu))
+		return;
+
+	write_sysreg(vcpu->arch.ctxt.spsr_abt, spsr_abt);
+	write_sysreg(vcpu->arch.ctxt.spsr_und, spsr_und);
+	write_sysreg(vcpu->arch.ctxt.spsr_irq, spsr_irq);
+	write_sysreg(vcpu->arch.ctxt.spsr_fiq, spsr_fiq);
+
+	write_sysreg(__vcpu_sys_reg(vcpu, DACR32_EL2), dacr32_el2);
+	write_sysreg(__vcpu_sys_reg(vcpu, IFSR32_EL2), ifsr32_el2);
+
+	if (has_vhe() || vcpu_get_flag(vcpu, DEBUG_DIRTY))
+		write_sysreg(__vcpu_sys_reg(vcpu, DBGVCR32_EL2), dbgvcr32_el2);
+}
+
+#endif /* __ARM64_KVM_HYP_SYSREG_SR_H__ */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/early_alloc.h b/arch/arm64/kvm/hyp/include/nvhe/early_alloc.h
new file mode 100644
index 000000000..dc61aaa56
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/early_alloc.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_EARLY_ALLOC_H
+#define __KVM_HYP_EARLY_ALLOC_H
+
+#include <asm/kvm_pgtable.h>
+
+void hyp_early_alloc_init(void *virt, unsigned long size);
+unsigned long hyp_early_alloc_nr_used_pages(void);
+void *hyp_early_alloc_page(void *arg);
+void *hyp_early_alloc_contig(unsigned int nr_pages);
+
+extern struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops;
+
+#endif /* __KVM_HYP_EARLY_ALLOC_H */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/fixed_config.h b/arch/arm64/kvm/hyp/include/nvhe/fixed_config.h
new file mode 100644
index 000000000..37440e1dd
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/fixed_config.h
@@ -0,0 +1,208 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2021 Google LLC
+ * Author: Fuad Tabba <tabba@google.com>
+ */
+
+#ifndef __ARM64_KVM_FIXED_CONFIG_H__
+#define __ARM64_KVM_FIXED_CONFIG_H__
+
+#include <asm/sysreg.h>
+
+/*
+ * This file contains definitions for features to be allowed or restricted for
+ * guest virtual machines, depending on the mode KVM is running in and on the
+ * type of guest that is running.
+ *
+ * The ALLOW masks represent a bitmask of feature fields that are allowed
+ * without any restrictions as long as they are supported by the system.
+ *
+ * The RESTRICT_UNSIGNED masks, if present, represent unsigned fields for
+ * features that are restricted to support at most the specified feature.
+ *
+ * If a feature field is not present in either, than it is not supported.
+ *
+ * The approach taken for protected VMs is to allow features that are:
+ * - Needed by common Linux distributions (e.g., floating point)
+ * - Trivial to support, e.g., supporting the feature does not introduce or
+ * require tracking of additional state in KVM
+ * - Cannot be trapped or prevent the guest from using anyway
+ */
+
+/*
+ * Allow for protected VMs:
+ * - Floating-point and Advanced SIMD
+ * - Data Independent Timing
+ * - Spectre/Meltdown Mitigation
+ */
+#define PVM_ID_AA64PFR0_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_FP) | \
+	ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_AdvSIMD) | \
+	ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_DIT) | \
+	ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2) | \
+	ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3) \
+	)
+
+/*
+ * Restrict to the following *unsigned* features for protected VMs:
+ * - AArch64 guests only (no support for AArch32 guests):
+ *	AArch32 adds complexity in trap handling, emulation, condition codes,
+ *	etc...
+ * - RAS (v1)
+ *	Supported by KVM
+ */
+#define PVM_ID_AA64PFR0_RESTRICT_UNSIGNED (\
+	FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL0), ID_AA64PFR0_EL1_ELx_64BIT_ONLY) | \
+	FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL1), ID_AA64PFR0_EL1_ELx_64BIT_ONLY) | \
+	FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL2), ID_AA64PFR0_EL1_ELx_64BIT_ONLY) | \
+	FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL3), ID_AA64PFR0_EL1_ELx_64BIT_ONLY) | \
+	FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_RAS), ID_AA64PFR0_EL1_RAS_IMP) \
+	)
+
+/*
+ * Allow for protected VMs:
+ * - Branch Target Identification
+ * - Speculative Store Bypassing
+ */
+#define PVM_ID_AA64PFR1_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_BT) | \
+	ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SSBS) \
+	)
+
+/*
+ * Allow for protected VMs:
+ * - Mixed-endian
+ * - Distinction between Secure and Non-secure Memory
+ * - Mixed-endian at EL0 only
+ * - Non-context synchronizing exception entry and exit
+ */
+#define PVM_ID_AA64MMFR0_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_BIGEND) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_SNSMEM) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_BIGENDEL0) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_EXS) \
+	)
+
+/*
+ * Restrict to the following *unsigned* features for protected VMs:
+ * - 40-bit IPA
+ * - 16-bit ASID
+ */
+#define PVM_ID_AA64MMFR0_RESTRICT_UNSIGNED (\
+	FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_PARANGE), ID_AA64MMFR0_EL1_PARANGE_40) | \
+	FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_ASIDBITS), ID_AA64MMFR0_EL1_ASIDBITS_16) \
+	)
+
+/*
+ * Allow for protected VMs:
+ * - Hardware translation table updates to Access flag and Dirty state
+ * - Number of VMID bits from CPU
+ * - Hierarchical Permission Disables
+ * - Privileged Access Never
+ * - SError interrupt exceptions from speculative reads
+ * - Enhanced Translation Synchronization
+ */
+#define PVM_ID_AA64MMFR1_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_HAFDBS) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_VMIDBits) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_HPDS) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_PAN) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_SpecSEI) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_ETS) \
+	)
+
+/*
+ * Allow for protected VMs:
+ * - Common not Private translations
+ * - User Access Override
+ * - IESB bit in the SCTLR_ELx registers
+ * - Unaligned single-copy atomicity and atomic functions
+ * - ESR_ELx.EC value on an exception by read access to feature ID space
+ * - TTL field in address operations.
+ * - Break-before-make sequences when changing translation block size
+ * - E0PDx mechanism
+ */
+#define PVM_ID_AA64MMFR2_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_CnP) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_UAO) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_IESB) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_AT) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_IDS) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_TTL) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_BBM) | \
+	ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_E0PD) \
+	)
+
+/*
+ * No support for Scalable Vectors for protected VMs:
+ *	Requires additional support from KVM, e.g., context-switching and
+ *	trapping at EL2
+ */
+#define PVM_ID_AA64ZFR0_ALLOW (0ULL)
+
+/*
+ * No support for debug, including breakpoints, and watchpoints for protected
+ * VMs:
+ *	The Arm architecture mandates support for at least the Armv8 debug
+ *	architecture, which would include at least 2 hardware breakpoints and
+ *	watchpoints. Providing that support to protected guests adds
+ *	considerable state and complexity. Therefore, the reserved value of 0 is
+ *	used for debug-related fields.
+ */
+#define PVM_ID_AA64DFR0_ALLOW (0ULL)
+#define PVM_ID_AA64DFR1_ALLOW (0ULL)
+
+/*
+ * No support for implementation defined features.
+ */
+#define PVM_ID_AA64AFR0_ALLOW (0ULL)
+#define PVM_ID_AA64AFR1_ALLOW (0ULL)
+
+/*
+ * No restrictions on instructions implemented in AArch64.
+ */
+#define PVM_ID_AA64ISAR0_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_AES) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_SHA1) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_SHA2) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_CRC32) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_ATOMIC) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_RDM) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_SHA3) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_SM3) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_SM4) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_DP) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_FHM) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_TS) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_TLB) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_RNDR) \
+	)
+
+#define PVM_ID_AA64ISAR1_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_DPB) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_JSCVT) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_FCMA) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_LRCPC) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPA) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPI) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_FRINTTS) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_SB) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_SPECRES) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_BF16) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_DGH) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_I8MM) \
+	)
+
+#define PVM_ID_AA64ISAR2_ALLOW (\
+	ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3) | \
+	ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) \
+	)
+
+u64 pvm_read_id_reg(const struct kvm_vcpu *vcpu, u32 id);
+bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code);
+bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64 *exit_code);
+int kvm_check_pvm_sysreg_table(void);
+
+#endif /* __ARM64_KVM_FIXED_CONFIG_H__ */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/gfp.h b/arch/arm64/kvm/hyp/include/nvhe/gfp.h
new file mode 100644
index 000000000..0a048dc06
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/gfp.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_GFP_H
+#define __KVM_HYP_GFP_H
+
+#include <linux/list.h>
+
+#include <nvhe/memory.h>
+#include <nvhe/spinlock.h>
+
+#define HYP_NO_ORDER	USHRT_MAX
+
+struct hyp_pool {
+	/*
+	 * Spinlock protecting concurrent changes to the memory pool as well as
+	 * the struct hyp_page of the pool's pages until we have a proper atomic
+	 * API at EL2.
+	 */
+	hyp_spinlock_t lock;
+	struct list_head free_area[MAX_ORDER];
+	phys_addr_t range_start;
+	phys_addr_t range_end;
+	unsigned short max_order;
+};
+
+/* Allocation */
+void *hyp_alloc_pages(struct hyp_pool *pool, unsigned short order);
+void hyp_split_page(struct hyp_page *page);
+void hyp_get_page(struct hyp_pool *pool, void *addr);
+void hyp_put_page(struct hyp_pool *pool, void *addr);
+
+/* Used pages cannot be freed */
+int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
+		  unsigned int reserved_pages);
+#endif /* __KVM_HYP_GFP_H */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
new file mode 100644
index 000000000..80e99836e
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#ifndef __KVM_NVHE_MEM_PROTECT__
+#define __KVM_NVHE_MEM_PROTECT__
+#include <linux/kvm_host.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/virt.h>
+#include <nvhe/spinlock.h>
+
+/*
+ * SW bits 0-1 are reserved to track the memory ownership state of each page:
+ *   00: The page is owned exclusively by the page-table owner.
+ *   01: The page is owned by the page-table owner, but is shared
+ *       with another entity.
+ *   10: The page is shared with, but not owned by the page-table owner.
+ *   11: Reserved for future use (lending).
+ */
+enum pkvm_page_state {
+	PKVM_PAGE_OWNED			= 0ULL,
+	PKVM_PAGE_SHARED_OWNED		= KVM_PGTABLE_PROT_SW0,
+	PKVM_PAGE_SHARED_BORROWED	= KVM_PGTABLE_PROT_SW1,
+	__PKVM_PAGE_RESERVED		= KVM_PGTABLE_PROT_SW0 |
+					  KVM_PGTABLE_PROT_SW1,
+
+	/* Meta-states which aren't encoded directly in the PTE's SW bits */
+	PKVM_NOPAGE,
+};
+
+#define PKVM_PAGE_STATE_PROT_MASK	(KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1)
+static inline enum kvm_pgtable_prot pkvm_mkstate(enum kvm_pgtable_prot prot,
+						 enum pkvm_page_state state)
+{
+	return (prot & ~PKVM_PAGE_STATE_PROT_MASK) | state;
+}
+
+static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot)
+{
+	return prot & PKVM_PAGE_STATE_PROT_MASK;
+}
+
+struct host_kvm {
+	struct kvm_arch arch;
+	struct kvm_pgtable pgt;
+	struct kvm_pgtable_mm_ops mm_ops;
+	hyp_spinlock_t lock;
+};
+extern struct host_kvm host_kvm;
+
+extern const u8 pkvm_hyp_id;
+
+int __pkvm_prot_finalize(void);
+int __pkvm_host_share_hyp(u64 pfn);
+int __pkvm_host_unshare_hyp(u64 pfn);
+
+bool addr_is_memory(phys_addr_t phys);
+int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot);
+int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id);
+int kvm_host_prepare_stage2(void *pgt_pool_base);
+void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt);
+
+static __always_inline void __load_host_stage2(void)
+{
+	if (static_branch_likely(&kvm_protected_mode_initialized))
+		__load_stage2(&host_kvm.arch.mmu, &host_kvm.arch);
+	else
+		write_sysreg(0, vttbr_el2);
+}
+#endif /* __KVM_NVHE_MEM_PROTECT__ */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/memory.h b/arch/arm64/kvm/hyp/include/nvhe/memory.h
new file mode 100644
index 000000000..592b7edb3
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/memory.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_MEMORY_H
+#define __KVM_HYP_MEMORY_H
+
+#include <asm/kvm_mmu.h>
+#include <asm/page.h>
+
+#include <linux/types.h>
+
+struct hyp_page {
+	unsigned short refcount;
+	unsigned short order;
+};
+
+extern u64 __hyp_vmemmap;
+#define hyp_vmemmap ((struct hyp_page *)__hyp_vmemmap)
+
+#define __hyp_va(phys)	((void *)((phys_addr_t)(phys) - hyp_physvirt_offset))
+
+static inline void *hyp_phys_to_virt(phys_addr_t phys)
+{
+	return __hyp_va(phys);
+}
+
+static inline phys_addr_t hyp_virt_to_phys(void *addr)
+{
+	return __hyp_pa(addr);
+}
+
+#define hyp_phys_to_pfn(phys)	((phys) >> PAGE_SHIFT)
+#define hyp_pfn_to_phys(pfn)	((phys_addr_t)((pfn) << PAGE_SHIFT))
+#define hyp_phys_to_page(phys)	(&hyp_vmemmap[hyp_phys_to_pfn(phys)])
+#define hyp_virt_to_page(virt)	hyp_phys_to_page(__hyp_pa(virt))
+#define hyp_virt_to_pfn(virt)	hyp_phys_to_pfn(__hyp_pa(virt))
+
+#define hyp_page_to_pfn(page)	((struct hyp_page *)(page) - hyp_vmemmap)
+#define hyp_page_to_phys(page)  hyp_pfn_to_phys((hyp_page_to_pfn(page)))
+#define hyp_page_to_virt(page)	__hyp_va(hyp_page_to_phys(page))
+#define hyp_page_to_pool(page)	(((struct hyp_page *)page)->pool)
+
+static inline int hyp_page_count(void *addr)
+{
+	struct hyp_page *p = hyp_virt_to_page(addr);
+
+	return p->refcount;
+}
+
+#endif /* __KVM_HYP_MEMORY_H */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h
new file mode 100644
index 000000000..42d8eb9bf
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __KVM_HYP_MM_H
+#define __KVM_HYP_MM_H
+
+#include <asm/kvm_pgtable.h>
+#include <asm/spectre.h>
+#include <linux/memblock.h>
+#include <linux/types.h>
+
+#include <nvhe/memory.h>
+#include <nvhe/spinlock.h>
+
+extern struct kvm_pgtable pkvm_pgtable;
+extern hyp_spinlock_t pkvm_pgd_lock;
+
+int hyp_create_idmap(u32 hyp_va_bits);
+int hyp_map_vectors(void);
+int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back);
+int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot);
+int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot);
+int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot);
+int __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
+				  enum kvm_pgtable_prot prot,
+				  unsigned long *haddr);
+int pkvm_alloc_private_va_range(size_t size, unsigned long *haddr);
+
+static inline void hyp_vmemmap_range(phys_addr_t phys, unsigned long size,
+				     unsigned long *start, unsigned long *end)
+{
+	unsigned long nr_pages = size >> PAGE_SHIFT;
+	struct hyp_page *p = hyp_phys_to_page(phys);
+
+	*start = (unsigned long)p;
+	*end = *start + nr_pages * sizeof(struct hyp_page);
+	*start = ALIGN_DOWN(*start, PAGE_SIZE);
+	*end = ALIGN(*end, PAGE_SIZE);
+}
+
+#endif /* __KVM_HYP_MM_H */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h
new file mode 100644
index 000000000..4652fd04b
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * A stand-alone ticket spinlock implementation for use by the non-VHE
+ * KVM hypervisor code running at EL2.
+ *
+ * Copyright (C) 2020 Google LLC
+ * Author: Will Deacon <will@kernel.org>
+ *
+ * Heavily based on the implementation removed by c11090474d70 which was:
+ * Copyright (C) 2012 ARM Ltd.
+ */
+
+#ifndef __ARM64_KVM_NVHE_SPINLOCK_H__
+#define __ARM64_KVM_NVHE_SPINLOCK_H__
+
+#include <asm/alternative.h>
+#include <asm/lse.h>
+#include <asm/rwonce.h>
+
+typedef union hyp_spinlock {
+	u32	__val;
+	struct {
+#ifdef __AARCH64EB__
+		u16 next, owner;
+#else
+		u16 owner, next;
+#endif
+	};
+} hyp_spinlock_t;
+
+#define hyp_spin_lock_init(l)						\
+do {									\
+	*(l) = (hyp_spinlock_t){ .__val = 0 };				\
+} while (0)
+
+static inline void hyp_spin_lock(hyp_spinlock_t *lock)
+{
+	u32 tmp;
+	hyp_spinlock_t lockval, newval;
+
+	asm volatile(
+	/* Atomically increment the next ticket. */
+	ARM64_LSE_ATOMIC_INSN(
+	/* LL/SC */
+"	prfm	pstl1strm, %3\n"
+"1:	ldaxr	%w0, %3\n"
+"	add	%w1, %w0, #(1 << 16)\n"
+"	stxr	%w2, %w1, %3\n"
+"	cbnz	%w2, 1b\n",
+	/* LSE atomics */
+"	mov	%w2, #(1 << 16)\n"
+"	ldadda	%w2, %w0, %3\n"
+	__nops(3))
+
+	/* Did we get the lock? */
+"	eor	%w1, %w0, %w0, ror #16\n"
+"	cbz	%w1, 3f\n"
+	/*
+	 * No: spin on the owner. Send a local event to avoid missing an
+	 * unlock before the exclusive load.
+	 */
+"	sevl\n"
+"2:	wfe\n"
+"	ldaxrh	%w2, %4\n"
+"	eor	%w1, %w2, %w0, lsr #16\n"
+"	cbnz	%w1, 2b\n"
+	/* We got the lock. Critical section starts here. */
+"3:"
+	: "=&r" (lockval), "=&r" (newval), "=&r" (tmp), "+Q" (*lock)
+	: "Q" (lock->owner)
+	: "memory");
+}
+
+static inline void hyp_spin_unlock(hyp_spinlock_t *lock)
+{
+	u64 tmp;
+
+	asm volatile(
+	ARM64_LSE_ATOMIC_INSN(
+	/* LL/SC */
+	"	ldrh	%w1, %0\n"
+	"	add	%w1, %w1, #1\n"
+	"	stlrh	%w1, %0",
+	/* LSE atomics */
+	"	mov	%w1, #1\n"
+	"	staddlh	%w1, %0\n"
+	__nops(1))
+	: "=Q" (lock->owner), "=&r" (tmp)
+	:
+	: "memory");
+}
+
+static inline bool hyp_spin_is_locked(hyp_spinlock_t *lock)
+{
+	hyp_spinlock_t lockval = READ_ONCE(*lock);
+
+	return lockval.owner != lockval.next;
+}
+
+#ifdef CONFIG_NVHE_EL2_DEBUG
+static inline void hyp_assert_lock_held(hyp_spinlock_t *lock)
+{
+	/*
+	 * The __pkvm_init() path accesses protected data-structures without
+	 * holding locks as the other CPUs are guaranteed to not enter EL2
+	 * concurrently at this point in time. The point by which EL2 is
+	 * initialized on all CPUs is reflected in the pkvm static key, so
+	 * wait until it is set before checking the lock state.
+	 */
+	if (static_branch_likely(&kvm_protected_mode_initialized))
+		BUG_ON(!hyp_spin_is_locked(lock));
+}
+#else
+static inline void hyp_assert_lock_held(hyp_spinlock_t *lock) { }
+#endif
+
+#endif /* __ARM64_KVM_NVHE_SPINLOCK_H__ */
diff --git a/arch/arm64/kvm/hyp/include/nvhe/trap_handler.h b/arch/arm64/kvm/hyp/include/nvhe/trap_handler.h
new file mode 100644
index 000000000..45a84f0ad
--- /dev/null
+++ b/arch/arm64/kvm/hyp/include/nvhe/trap_handler.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Trap handler helpers.
+ *
+ * Copyright (C) 2020 - Google LLC
+ * Author: Marc Zyngier <maz@kernel.org>
+ */
+
+#ifndef __ARM64_KVM_NVHE_TRAP_HANDLER_H__
+#define __ARM64_KVM_NVHE_TRAP_HANDLER_H__
+
+#include <asm/kvm_host.h>
+
+#define cpu_reg(ctxt, r)	(ctxt)->regs.regs[r]
+#define DECLARE_REG(type, name, ctxt, reg)	\
+				type name = (type)cpu_reg(ctxt, (reg))
+
+void __pkvm_vcpu_init_traps(struct kvm_vcpu *vcpu);
+
+#endif /* __ARM64_KVM_NVHE_TRAP_HANDLER_H__ */
diff --git a/arch/arm64/kvm/hyp/nvhe/.gitignore b/arch/arm64/kvm/hyp/nvhe/.gitignore
new file mode 100644
index 000000000..5b6c43cc9
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/.gitignore
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+gen-hyprel
+hyp.lds
+hyp-reloc.S
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
new file mode 100644
index 000000000..be0a2bc3e
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -0,0 +1,111 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part
+#
+
+asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
+
+# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as
+# there is no way to execute them and any such MMIO access from nVHE KVM
+# will explode instantly (Words of Marc Zyngier). So introduce a generic flag
+# __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM.
+ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__
+ccflags-y += -fno-stack-protector	\
+	     -DDISABLE_BRANCH_PROFILING	\
+	     $(DISABLE_STACKLEAK_PLUGIN)
+
+hostprogs := gen-hyprel
+HOST_EXTRACFLAGS += -I$(objtree)/include
+
+lib-objs := clear_page.o copy_page.o memcpy.o memset.o
+lib-objs := $(addprefix ../../../lib/, $(lib-objs))
+
+hyp-obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
+	 hyp-main.o hyp-smp.o psci-relay.o early_alloc.o page_alloc.o \
+	 cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o stacktrace.o
+hyp-obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
+	 ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o
+hyp-obj-$(CONFIG_DEBUG_LIST) += list_debug.o
+hyp-obj-y += $(lib-objs)
+
+##
+## Build rules for compiling nVHE hyp code
+## Output of this folder is `kvm_nvhe.o`, a partially linked object
+## file containing all nVHE hyp code and data.
+##
+
+hyp-obj := $(patsubst %.o,%.nvhe.o,$(hyp-obj-y))
+obj-y := kvm_nvhe.o
+targets += $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o
+
+# 1) Compile all source files to `.nvhe.o` object files. The file extension
+#    avoids file name clashes for files shared with VHE.
+$(obj)/%.nvhe.o: $(src)/%.c FORCE
+	$(call if_changed_rule,cc_o_c)
+$(obj)/%.nvhe.o: $(src)/%.S FORCE
+	$(call if_changed_rule,as_o_S)
+
+# 2) Compile linker script.
+$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE
+	$(call if_changed_dep,cpp_lds_S)
+
+# 3) Partially link all '.nvhe.o' files and apply the linker script.
+#    Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'.
+#    Note: The following rule assumes that the 'ld' rule puts LDFLAGS before
+#          the list of dependencies to form '-T $(obj)/hyp.lds'. This is to
+#          keep the dependency on the target while avoiding an error from
+#          GNU ld if the linker script is passed to it twice.
+LDFLAGS_kvm_nvhe.tmp.o := -r -T
+$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
+	$(call if_changed,ld)
+
+# 4) Generate list of hyp code/data positions that need to be relocated at
+#    runtime. Because the hypervisor is part of the kernel binary, relocations
+#    produce a kernel VA. We enumerate relocations targeting hyp at build time
+#    and convert the kernel VAs at those positions to hyp VAs.
+$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE
+	$(call if_changed,hyprel)
+
+# 5) Compile hyp-reloc.S and link it into the existing partially linked object.
+#    The object file now contains a section with pointers to hyp positions that
+#    will contain kernel VAs at runtime. These pointers have relocations on them
+#    so that they get updated as the hyp object is linked into `vmlinux`.
+LDFLAGS_kvm_nvhe.rel.o := -r
+$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE
+	$(call if_changed,ld)
+
+# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
+#    Prefixes names of ELF symbols with '__kvm_nvhe_'.
+$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE
+	$(call if_changed,hypcopy)
+
+# The HYPREL command calls `gen-hyprel` to generate an assembly file with
+# a list of relocations targeting hyp code/data.
+quiet_cmd_hyprel = HYPREL  $@
+      cmd_hyprel = $(obj)/gen-hyprel $< > $@
+
+# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
+# to avoid clashes with VHE code/data.
+quiet_cmd_hypcopy = HYPCOPY $@
+      cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@
+
+# Remove ftrace, Shadow Call Stack, and CFI CFLAGS.
+# This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations.
+KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS))
+# Starting from 13.0.0 llvm emits SHT_REL section '.llvm.call-graph-profile'
+# when profile optimization is applied. gen-hyprel does not support SHT_REL and
+# causes a build failure. Remove profile optimization flags.
+KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%, $(KBUILD_CFLAGS))
+
+# KVM nVHE code is run at a different exception code with a different map, so
+# compiler instrumentation that inserts callbacks or checks into the code may
+# cause crashes. Just disable it.
+GCOV_PROFILE	:= n
+KASAN_SANITIZE	:= n
+KCSAN_SANITIZE	:= n
+UBSAN_SANITIZE	:= n
+KCOV_INSTRUMENT	:= n
+
+# Skip objtool checking for this directory because nVHE code is compiled with
+# non-standard build rules.
+OBJECT_FILES_NON_STANDARD := y
diff --git a/arch/arm64/kvm/hyp/nvhe/cache.S b/arch/arm64/kvm/hyp/nvhe/cache.S
new file mode 100644
index 000000000..0c367eb5f
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/cache.S
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Code copied from arch/arm64/mm/cache.S.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/alternative.h>
+
+SYM_FUNC_START(__pi_dcache_clean_inval_poc)
+	dcache_by_line_op civac, sy, x0, x1, x2, x3
+	ret
+SYM_FUNC_END(__pi_dcache_clean_inval_poc)
+SYM_FUNC_ALIAS(dcache_clean_inval_poc, __pi_dcache_clean_inval_poc)
diff --git a/arch/arm64/kvm/hyp/nvhe/debug-sr.c b/arch/arm64/kvm/hyp/nvhe/debug-sr.c
new file mode 100644
index 000000000..e17455773
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/debug-sr.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/debug-sr.h>
+
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/debug-monitors.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+static void __debug_save_spe(u64 *pmscr_el1)
+{
+	u64 reg;
+
+	/* Clear pmscr in case of early return */
+	*pmscr_el1 = 0;
+
+	/*
+	 * At this point, we know that this CPU implements
+	 * SPE and is available to the host.
+	 * Check if the host is actually using it ?
+	 */
+	reg = read_sysreg_s(SYS_PMBLIMITR_EL1);
+	if (!(reg & BIT(SYS_PMBLIMITR_EL1_E_SHIFT)))
+		return;
+
+	/* Yes; save the control register and disable data generation */
+	*pmscr_el1 = read_sysreg_s(SYS_PMSCR_EL1);
+	write_sysreg_s(0, SYS_PMSCR_EL1);
+	isb();
+
+	/* Now drain all buffered data to memory */
+	psb_csync();
+	dsb(nsh);
+}
+
+static void __debug_restore_spe(u64 pmscr_el1)
+{
+	if (!pmscr_el1)
+		return;
+
+	/* The host page table is installed, but not yet synchronised */
+	isb();
+
+	/* Re-enable data generation */
+	write_sysreg_s(pmscr_el1, SYS_PMSCR_EL1);
+}
+
+static void __debug_save_trace(u64 *trfcr_el1)
+{
+	*trfcr_el1 = 0;
+
+	/* Check if the TRBE is enabled */
+	if (!(read_sysreg_s(SYS_TRBLIMITR_EL1) & TRBLIMITR_ENABLE))
+		return;
+	/*
+	 * Prohibit trace generation while we are in guest.
+	 * Since access to TRFCR_EL1 is trapped, the guest can't
+	 * modify the filtering set by the host.
+	 */
+	*trfcr_el1 = read_sysreg_s(SYS_TRFCR_EL1);
+	write_sysreg_s(0, SYS_TRFCR_EL1);
+	isb();
+	/* Drain the trace buffer to memory */
+	tsb_csync();
+	dsb(nsh);
+}
+
+static void __debug_restore_trace(u64 trfcr_el1)
+{
+	if (!trfcr_el1)
+		return;
+
+	/* Restore trace filter controls */
+	write_sysreg_s(trfcr_el1, SYS_TRFCR_EL1);
+}
+
+void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu)
+{
+	/* Disable and flush SPE data generation */
+	if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_SPE))
+		__debug_save_spe(&vcpu->arch.host_debug_state.pmscr_el1);
+	/* Disable and flush Self-Hosted Trace generation */
+	if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_TRBE))
+		__debug_save_trace(&vcpu->arch.host_debug_state.trfcr_el1);
+}
+
+void __debug_switch_to_guest(struct kvm_vcpu *vcpu)
+{
+	__debug_switch_to_guest_common(vcpu);
+}
+
+void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_SPE))
+		__debug_restore_spe(vcpu->arch.host_debug_state.pmscr_el1);
+	if (vcpu_get_flag(vcpu, DEBUG_STATE_SAVE_TRBE))
+		__debug_restore_trace(vcpu->arch.host_debug_state.trfcr_el1);
+}
+
+void __debug_switch_to_host(struct kvm_vcpu *vcpu)
+{
+	__debug_switch_to_host_common(vcpu);
+}
+
+u64 __kvm_get_mdcr_el2(void)
+{
+	return read_sysreg(mdcr_el2);
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/early_alloc.c b/arch/arm64/kvm/hyp/nvhe/early_alloc.c
new file mode 100644
index 000000000..00de04153
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/early_alloc.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <asm/kvm_pgtable.h>
+
+#include <nvhe/early_alloc.h>
+#include <nvhe/memory.h>
+
+struct kvm_pgtable_mm_ops hyp_early_alloc_mm_ops;
+s64 __ro_after_init hyp_physvirt_offset;
+
+static unsigned long base;
+static unsigned long end;
+static unsigned long cur;
+
+unsigned long hyp_early_alloc_nr_used_pages(void)
+{
+	return (cur - base) >> PAGE_SHIFT;
+}
+
+void *hyp_early_alloc_contig(unsigned int nr_pages)
+{
+	unsigned long size = (nr_pages << PAGE_SHIFT);
+	void *ret = (void *)cur;
+
+	if (!nr_pages)
+		return NULL;
+
+	if (end - cur < size)
+		return NULL;
+
+	cur += size;
+	memset(ret, 0, size);
+
+	return ret;
+}
+
+void *hyp_early_alloc_page(void *arg)
+{
+	return hyp_early_alloc_contig(1);
+}
+
+static void hyp_early_alloc_get_page(void *addr) { }
+static void hyp_early_alloc_put_page(void *addr) { }
+
+void hyp_early_alloc_init(void *virt, unsigned long size)
+{
+	base = cur = (unsigned long)virt;
+	end = base + size;
+
+	hyp_early_alloc_mm_ops.zalloc_page = hyp_early_alloc_page;
+	hyp_early_alloc_mm_ops.phys_to_virt = hyp_phys_to_virt;
+	hyp_early_alloc_mm_ops.virt_to_phys = hyp_virt_to_phys;
+	hyp_early_alloc_mm_ops.get_page = hyp_early_alloc_get_page;
+	hyp_early_alloc_mm_ops.put_page = hyp_early_alloc_put_page;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
new file mode 100644
index 000000000..6bc88a756
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
@@ -0,0 +1,456 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: David Brazdil <dbrazdil@google.com>
+ *
+ * Generates relocation information used by the kernel to convert
+ * absolute addresses in hyp data from kernel VAs to hyp VAs.
+ *
+ * This is necessary because hyp code is linked into the same binary
+ * as the kernel but executes under different memory mappings.
+ * If the compiler used absolute addressing, those addresses need to
+ * be converted before they are used by hyp code.
+ *
+ * The input of this program is the relocatable ELF object containing
+ * all hyp code/data, not yet linked into vmlinux. Hyp section names
+ * should have been prefixed with `.hyp` at this point.
+ *
+ * The output (printed to stdout) is an assembly file containing
+ * an array of 32-bit integers and static relocations that instruct
+ * the linker of `vmlinux` to populate the array entries with offsets
+ * to positions in the kernel binary containing VAs used by hyp code.
+ *
+ * Note that dynamic relocations could be used for the same purpose.
+ * However, those are only generated if CONFIG_RELOCATABLE=y.
+ */
+
+#include <elf.h>
+#include <endian.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <generated/autoconf.h>
+
+#define HYP_SECTION_PREFIX		".hyp"
+#define HYP_RELOC_SECTION		".hyp.reloc"
+#define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
+
+/*
+ * AArch64 relocation type constants.
+ * Included in case these are not defined in the host toolchain.
+ */
+#ifndef R_AARCH64_ABS64
+#define R_AARCH64_ABS64			257
+#endif
+#ifndef R_AARCH64_PREL64
+#define R_AARCH64_PREL64		260
+#endif
+#ifndef R_AARCH64_PREL32
+#define R_AARCH64_PREL32		261
+#endif
+#ifndef R_AARCH64_PREL16
+#define R_AARCH64_PREL16		262
+#endif
+#ifndef R_AARCH64_PLT32
+#define R_AARCH64_PLT32			314
+#endif
+#ifndef R_AARCH64_LD_PREL_LO19
+#define R_AARCH64_LD_PREL_LO19		273
+#endif
+#ifndef R_AARCH64_ADR_PREL_LO21
+#define R_AARCH64_ADR_PREL_LO21		274
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21
+#define R_AARCH64_ADR_PREL_PG_HI21	275
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21_NC
+#define R_AARCH64_ADR_PREL_PG_HI21_NC	276
+#endif
+#ifndef R_AARCH64_ADD_ABS_LO12_NC
+#define R_AARCH64_ADD_ABS_LO12_NC	277
+#endif
+#ifndef R_AARCH64_LDST8_ABS_LO12_NC
+#define R_AARCH64_LDST8_ABS_LO12_NC	278
+#endif
+#ifndef R_AARCH64_TSTBR14
+#define R_AARCH64_TSTBR14		279
+#endif
+#ifndef R_AARCH64_CONDBR19
+#define R_AARCH64_CONDBR19		280
+#endif
+#ifndef R_AARCH64_JUMP26
+#define R_AARCH64_JUMP26		282
+#endif
+#ifndef R_AARCH64_CALL26
+#define R_AARCH64_CALL26		283
+#endif
+#ifndef R_AARCH64_LDST16_ABS_LO12_NC
+#define R_AARCH64_LDST16_ABS_LO12_NC	284
+#endif
+#ifndef R_AARCH64_LDST32_ABS_LO12_NC
+#define R_AARCH64_LDST32_ABS_LO12_NC	285
+#endif
+#ifndef R_AARCH64_LDST64_ABS_LO12_NC
+#define R_AARCH64_LDST64_ABS_LO12_NC	286
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0
+#define R_AARCH64_MOVW_PREL_G0		287
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0_NC
+#define R_AARCH64_MOVW_PREL_G0_NC	288
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1
+#define R_AARCH64_MOVW_PREL_G1		289
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1_NC
+#define R_AARCH64_MOVW_PREL_G1_NC	290
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2
+#define R_AARCH64_MOVW_PREL_G2		291
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2_NC
+#define R_AARCH64_MOVW_PREL_G2_NC	292
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G3
+#define R_AARCH64_MOVW_PREL_G3		293
+#endif
+#ifndef R_AARCH64_LDST128_ABS_LO12_NC
+#define R_AARCH64_LDST128_ABS_LO12_NC	299
+#endif
+
+/* Global state of the processed ELF. */
+static struct {
+	const char	*path;
+	char		*begin;
+	size_t		size;
+	Elf64_Ehdr	*ehdr;
+	Elf64_Shdr	*sh_table;
+	const char	*sh_string;
+} elf;
+
+#if defined(CONFIG_CPU_LITTLE_ENDIAN)
+
+#define elf16toh(x)	le16toh(x)
+#define elf32toh(x)	le32toh(x)
+#define elf64toh(x)	le64toh(x)
+
+#define ELFENDIAN	ELFDATA2LSB
+
+#elif defined(CONFIG_CPU_BIG_ENDIAN)
+
+#define elf16toh(x)	be16toh(x)
+#define elf32toh(x)	be32toh(x)
+#define elf64toh(x)	be64toh(x)
+
+#define ELFENDIAN	ELFDATA2MSB
+
+#else
+
+#error PDP-endian sadly unsupported...
+
+#endif
+
+#define fatal_error(fmt, ...)						\
+	({								\
+		fprintf(stderr, "error: %s: " fmt "\n",			\
+			elf.path, ## __VA_ARGS__);			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define fatal_perror(msg)						\
+	({								\
+		fprintf(stderr, "error: %s: " msg ": %s\n",		\
+			elf.path, strerror(errno));			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define assert_op(lhs, rhs, fmt, op)					\
+	({								\
+		typeof(lhs) _lhs = (lhs);				\
+		typeof(rhs) _rhs = (rhs);				\
+									\
+		if (!(_lhs op _rhs)) {					\
+			fatal_error("assertion " #lhs " " #op " " #rhs	\
+				" failed (lhs=" fmt ", rhs=" fmt	\
+				", line=%d)", _lhs, _rhs, __LINE__);	\
+		}							\
+	})
+
+#define assert_eq(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, ==)
+#define assert_ne(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, !=)
+#define assert_lt(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, <)
+#define assert_ge(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, >=)
+
+/*
+ * Return a pointer of a given type at a given offset from
+ * the beginning of the ELF file.
+ */
+#define elf_ptr(type, off) ((type *)(elf.begin + (off)))
+
+/* Iterate over all sections in the ELF. */
+#define for_each_section(var) \
+	for (var = elf.sh_table; var < elf.sh_table + elf16toh(elf.ehdr->e_shnum); ++var)
+
+/* Iterate over all Elf64_Rela relocations in a given section. */
+#define for_each_rela(shdr, var)					\
+	for (var = elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset));	\
+	     var < elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset) + elf64toh(shdr->sh_size)); var++)
+
+/* True if a string starts with a given prefix. */
+static inline bool starts_with(const char *str, const char *prefix)
+{
+	return memcmp(str, prefix, strlen(prefix)) == 0;
+}
+
+/* Returns a string containing the name of a given section. */
+static inline const char *section_name(Elf64_Shdr *shdr)
+{
+	return elf.sh_string + elf32toh(shdr->sh_name);
+}
+
+/* Returns a pointer to the first byte of section data. */
+static inline const char *section_begin(Elf64_Shdr *shdr)
+{
+	return elf_ptr(char, elf64toh(shdr->sh_offset));
+}
+
+/* Find a section by its offset from the beginning of the file. */
+static inline Elf64_Shdr *section_by_off(Elf64_Off off)
+{
+	assert_ne(off, 0UL, "%lu");
+	return elf_ptr(Elf64_Shdr, off);
+}
+
+/* Find a section by its index. */
+static inline Elf64_Shdr *section_by_idx(uint16_t idx)
+{
+	assert_ne(idx, SHN_UNDEF, "%u");
+	return &elf.sh_table[idx];
+}
+
+/*
+ * Memory-map the given ELF file, perform sanity checks, and
+ * populate global state.
+ */
+static void init_elf(const char *path)
+{
+	int fd, ret;
+	struct stat stat;
+
+	/* Store path in the global struct for error printing. */
+	elf.path = path;
+
+	/* Open the ELF file. */
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		fatal_perror("Could not open ELF file");
+
+	/* Get status of ELF file to obtain its size. */
+	ret = fstat(fd, &stat);
+	if (ret < 0) {
+		close(fd);
+		fatal_perror("Could not get status of ELF file");
+	}
+
+	/* mmap() the entire ELF file read-only at an arbitrary address. */
+	elf.begin = mmap(0, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (elf.begin == MAP_FAILED) {
+		close(fd);
+		fatal_perror("Could not mmap ELF file");
+	}
+
+	/* mmap() was successful, close the FD. */
+	close(fd);
+
+	/* Get pointer to the ELF header. */
+	assert_ge(stat.st_size, sizeof(*elf.ehdr), "%lu");
+	elf.ehdr = elf_ptr(Elf64_Ehdr, 0);
+
+	/* Check the ELF magic. */
+	assert_eq(elf.ehdr->e_ident[EI_MAG0], ELFMAG0, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG1], ELFMAG1, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG2], ELFMAG2, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG3], ELFMAG3, "0x%x");
+
+	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
+	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
+	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFENDIAN, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_type), ET_REL, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_machine), EM_AARCH64, "%u");
+
+	/* Populate fields of the global struct. */
+	elf.sh_table = section_by_off(elf64toh(elf.ehdr->e_shoff));
+	elf.sh_string = section_begin(section_by_idx(elf16toh(elf.ehdr->e_shstrndx)));
+}
+
+/* Print the prologue of the output ASM file. */
+static void emit_prologue(void)
+{
+	printf(".data\n"
+	       ".pushsection " HYP_RELOC_SECTION ", \"a\"\n");
+}
+
+/* Print ASM statements needed as a prologue to a processed hyp section. */
+static void emit_section_prologue(const char *sh_orig_name)
+{
+	/* Declare the hyp section symbol. */
+	printf(".global %s%s\n", HYP_SECTION_SYMBOL_PREFIX, sh_orig_name);
+}
+
+/*
+ * Print ASM statements to create a hyp relocation entry for a given
+ * R_AARCH64_ABS64 relocation.
+ *
+ * The linker of vmlinux will populate the position given by `rela` with
+ * an absolute 64-bit kernel VA. If the kernel is relocatable, it will
+ * also generate a dynamic relocation entry so that the kernel can shift
+ * the address at runtime for KASLR.
+ *
+ * Emit a 32-bit offset from the current address to the position given
+ * by `rela`. This way the kernel can iterate over all kernel VAs used
+ * by hyp at runtime and convert them to hyp VAs. However, that offset
+ * will not be known until linking of `vmlinux`, so emit a PREL32
+ * relocation referencing a symbol that the hyp linker script put at
+ * the beginning of the relocated section + the offset from `rela`.
+ */
+static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
+{
+	/* Offset of this reloc from the beginning of HYP_RELOC_SECTION. */
+	static size_t reloc_offset;
+
+	/* Create storage for the 32-bit offset. */
+	printf(".word 0\n");
+
+	/*
+	 * Create a PREL32 relocation which instructs the linker of `vmlinux`
+	 * to insert offset to position <base> + <offset>, where <base> is
+	 * a symbol at the beginning of the relocated section, and <offset>
+	 * is `rela->r_offset`.
+	 */
+	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
+	       reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
+	       elf64toh(rela->r_offset));
+
+	reloc_offset += 4;
+}
+
+/* Print the epilogue of the output ASM file. */
+static void emit_epilogue(void)
+{
+	printf(".popsection\n");
+}
+
+/*
+ * Iterate over all RELA relocations in a given section and emit
+ * hyp relocation data for all absolute addresses in hyp code/data.
+ *
+ * Static relocations that generate PC-relative-addressing are ignored.
+ * Failure is reported for unexpected relocation types.
+ */
+static void emit_rela_section(Elf64_Shdr *sh_rela)
+{
+	Elf64_Shdr *sh_orig = &elf.sh_table[elf32toh(sh_rela->sh_info)];
+	const char *sh_orig_name = section_name(sh_orig);
+	Elf64_Rela *rela;
+
+	/* Skip all non-hyp sections. */
+	if (!starts_with(sh_orig_name, HYP_SECTION_PREFIX))
+		return;
+
+	emit_section_prologue(sh_orig_name);
+
+	for_each_rela(sh_rela, rela) {
+		uint32_t type = (uint32_t)elf64toh(rela->r_info);
+
+		/* Check that rela points inside the relocated section. */
+		assert_lt(elf64toh(rela->r_offset), elf64toh(sh_orig->sh_size), "0x%lx");
+
+		switch (type) {
+		/*
+		 * Data relocations to generate absolute addressing.
+		 * Emit a hyp relocation.
+		 */
+		case R_AARCH64_ABS64:
+			emit_rela_abs64(rela, sh_orig_name);
+			break;
+		/* Allow position-relative data relocations. */
+		case R_AARCH64_PREL64:
+		case R_AARCH64_PREL32:
+		case R_AARCH64_PREL16:
+		case R_AARCH64_PLT32:
+			break;
+		/* Allow relocations to generate PC-relative addressing. */
+		case R_AARCH64_LD_PREL_LO19:
+		case R_AARCH64_ADR_PREL_LO21:
+		case R_AARCH64_ADR_PREL_PG_HI21:
+		case R_AARCH64_ADR_PREL_PG_HI21_NC:
+		case R_AARCH64_ADD_ABS_LO12_NC:
+		case R_AARCH64_LDST8_ABS_LO12_NC:
+		case R_AARCH64_LDST16_ABS_LO12_NC:
+		case R_AARCH64_LDST32_ABS_LO12_NC:
+		case R_AARCH64_LDST64_ABS_LO12_NC:
+		case R_AARCH64_LDST128_ABS_LO12_NC:
+			break;
+		/* Allow relative relocations for control-flow instructions. */
+		case R_AARCH64_TSTBR14:
+		case R_AARCH64_CONDBR19:
+		case R_AARCH64_JUMP26:
+		case R_AARCH64_CALL26:
+			break;
+		/* Allow group relocations to create PC-relative offset inline. */
+		case R_AARCH64_MOVW_PREL_G0:
+		case R_AARCH64_MOVW_PREL_G0_NC:
+		case R_AARCH64_MOVW_PREL_G1:
+		case R_AARCH64_MOVW_PREL_G1_NC:
+		case R_AARCH64_MOVW_PREL_G2:
+		case R_AARCH64_MOVW_PREL_G2_NC:
+		case R_AARCH64_MOVW_PREL_G3:
+			break;
+		default:
+			fatal_error("Unexpected RELA type %u", type);
+		}
+	}
+}
+
+/* Iterate over all sections and emit hyp relocation data for RELA sections. */
+static void emit_all_relocs(void)
+{
+	Elf64_Shdr *shdr;
+
+	for_each_section(shdr) {
+		switch (elf32toh(shdr->sh_type)) {
+		case SHT_REL:
+			fatal_error("Unexpected SHT_REL section \"%s\"",
+				section_name(shdr));
+		case SHT_RELA:
+			emit_rela_section(shdr);
+			break;
+		}
+	}
+}
+
+int main(int argc, const char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <elf_input>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	init_elf(argv[1]);
+
+	emit_prologue();
+	emit_all_relocs();
+	emit_epilogue();
+
+	return EXIT_SUCCESS;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
new file mode 100644
index 000000000..b6c0188c4
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/host.S
@@ -0,0 +1,265 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 - Google Inc
+ * Author: Andrew Scull <ascull@google.com>
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+
+	.text
+
+SYM_FUNC_START(__host_exit)
+	get_host_ctxt	x0, x1
+
+	/* Store the host regs x2 and x3 */
+	stp	x2, x3,   [x0, #CPU_XREG_OFFSET(2)]
+
+	/* Retrieve the host regs x0-x1 from the stack */
+	ldp	x2, x3, [sp], #16	// x0, x1
+
+	/* Store the host regs x0-x1 and x4-x17 */
+	stp	x2, x3,   [x0, #CPU_XREG_OFFSET(0)]
+	stp	x4, x5,   [x0, #CPU_XREG_OFFSET(4)]
+	stp	x6, x7,   [x0, #CPU_XREG_OFFSET(6)]
+	stp	x8, x9,   [x0, #CPU_XREG_OFFSET(8)]
+	stp	x10, x11, [x0, #CPU_XREG_OFFSET(10)]
+	stp	x12, x13, [x0, #CPU_XREG_OFFSET(12)]
+	stp	x14, x15, [x0, #CPU_XREG_OFFSET(14)]
+	stp	x16, x17, [x0, #CPU_XREG_OFFSET(16)]
+
+	/* Store the host regs x18-x29, lr */
+	save_callee_saved_regs x0
+
+	/* Save the host context pointer in x29 across the function call */
+	mov	x29, x0
+	bl	handle_trap
+
+	/* Restore host regs x0-x17 */
+__host_enter_restore_full:
+	ldp	x0, x1,   [x29, #CPU_XREG_OFFSET(0)]
+	ldp	x2, x3,   [x29, #CPU_XREG_OFFSET(2)]
+	ldp	x4, x5,   [x29, #CPU_XREG_OFFSET(4)]
+	ldp	x6, x7,   [x29, #CPU_XREG_OFFSET(6)]
+
+	/* x0-7 are use for panic arguments */
+__host_enter_for_panic:
+	ldp	x8, x9,   [x29, #CPU_XREG_OFFSET(8)]
+	ldp	x10, x11, [x29, #CPU_XREG_OFFSET(10)]
+	ldp	x12, x13, [x29, #CPU_XREG_OFFSET(12)]
+	ldp	x14, x15, [x29, #CPU_XREG_OFFSET(14)]
+	ldp	x16, x17, [x29, #CPU_XREG_OFFSET(16)]
+
+	/* Restore host regs x18-x29, lr */
+	restore_callee_saved_regs x29
+
+	/* Do not touch any register after this! */
+__host_enter_without_restoring:
+	eret
+	sb
+SYM_FUNC_END(__host_exit)
+
+/*
+ * void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
+ */
+SYM_FUNC_START(__host_enter)
+	mov	x29, x0
+	b	__host_enter_restore_full
+SYM_FUNC_END(__host_enter)
+
+/*
+ * void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
+ * 				  u64 elr, u64 par);
+ */
+SYM_FUNC_START(__hyp_do_panic)
+	/* Prepare and exit to the host's panic funciton. */
+	mov	lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
+		      PSR_MODE_EL1h)
+	msr	spsr_el2, lr
+	adr_l	lr, nvhe_hyp_panic_handler
+	hyp_kimg_va lr, x6
+	msr	elr_el2, lr
+
+	mov	x29, x0
+
+#ifdef CONFIG_NVHE_EL2_DEBUG
+	/* Ensure host stage-2 is disabled */
+	mrs	x0, hcr_el2
+	bic	x0, x0, #HCR_VM
+	msr	hcr_el2, x0
+	isb
+	tlbi	vmalls12e1
+	dsb	nsh
+#endif
+
+	/* Load the panic arguments into x0-7 */
+	mrs	x0, esr_el2
+	mov	x4, x3
+	mov	x3, x2
+	hyp_pa	x3, x6
+	get_vcpu_ptr x5, x6
+	mrs	x6, far_el2
+	mrs	x7, hpfar_el2
+
+	/* Enter the host, conditionally restoring the host context. */
+	cbz	x29, __host_enter_without_restoring
+	b	__host_enter_for_panic
+SYM_FUNC_END(__hyp_do_panic)
+
+SYM_FUNC_START(__host_hvc)
+	ldp	x0, x1, [sp]		// Don't fixup the stack yet
+
+	/* No stub for you, sonny Jim */
+alternative_if ARM64_KVM_PROTECTED_MODE
+	b	__host_exit
+alternative_else_nop_endif
+
+	/* Check for a stub HVC call */
+	cmp	x0, #HVC_STUB_HCALL_NR
+	b.hs	__host_exit
+
+	add	sp, sp, #16
+	/*
+	 * Compute the idmap address of __kvm_handle_stub_hvc and
+	 * jump there.
+	 *
+	 * Preserve x0-x4, which may contain stub parameters.
+	 */
+	adr_l	x5, __kvm_handle_stub_hvc
+	hyp_pa	x5, x6
+	br	x5
+SYM_FUNC_END(__host_hvc)
+
+.macro host_el1_sync_vect
+	.align 7
+.L__vect_start\@:
+	stp	x0, x1, [sp, #-16]!
+	mrs	x0, esr_el2
+	ubfx	x0, x0, #ESR_ELx_EC_SHIFT, #ESR_ELx_EC_WIDTH
+	cmp	x0, #ESR_ELx_EC_HVC64
+	b.eq	__host_hvc
+	b	__host_exit
+.L__vect_end\@:
+.if ((.L__vect_end\@ - .L__vect_start\@) > 0x80)
+	.error "host_el1_sync_vect larger than vector entry"
+.endif
+.endm
+
+.macro invalid_host_el2_vect
+	.align 7
+
+	/*
+	 * Test whether the SP has overflowed, without corrupting a GPR.
+	 * nVHE hypervisor stacks are aligned so that the PAGE_SHIFT bit
+	 * of SP should always be 1.
+	 */
+	add	sp, sp, x0			// sp' = sp + x0
+	sub	x0, sp, x0			// x0' = sp' - x0 = (sp + x0) - x0 = sp
+	tbz	x0, #PAGE_SHIFT, .L__hyp_sp_overflow\@
+	sub	x0, sp, x0			// x0'' = sp' - x0' = (sp + x0) - sp = x0
+	sub	sp, sp, x0			// sp'' = sp' - x0 = (sp + x0) - x0 = sp
+
+	/* If a guest is loaded, panic out of it. */
+	stp	x0, x1, [sp, #-16]!
+	get_loaded_vcpu x0, x1
+	cbnz	x0, __guest_exit_panic
+	add	sp, sp, #16
+
+	/*
+	 * The panic may not be clean if the exception is taken before the host
+	 * context has been saved by __host_exit or after the hyp context has
+	 * been partially clobbered by __host_enter.
+	 */
+	b	hyp_panic
+
+.L__hyp_sp_overflow\@:
+	/* Switch to the overflow stack */
+	adr_this_cpu sp, overflow_stack + OVERFLOW_STACK_SIZE, x0
+
+	b	hyp_panic_bad_stack
+	ASM_BUG()
+.endm
+
+.macro invalid_host_el1_vect
+	.align 7
+	mov	x0, xzr		/* restore_host = false */
+	mrs	x1, spsr_el2
+	mrs	x2, elr_el2
+	mrs	x3, par_el1
+	b	__hyp_do_panic
+.endm
+
+/*
+ * The host vector does not use an ESB instruction in order to avoid consuming
+ * SErrors that should only be consumed by the host. Guest entry is deferred by
+ * __guest_enter if there are any pending asynchronous exceptions so hyp will
+ * always return to the host without having consumerd host SErrors.
+ *
+ * CONFIG_KVM_INDIRECT_VECTORS is not applied to the host vectors because the
+ * host knows about the EL2 vectors already, and there is no point in hiding
+ * them.
+ */
+	.align 11
+SYM_CODE_START(__kvm_hyp_host_vector)
+	invalid_host_el2_vect			// Synchronous EL2t
+	invalid_host_el2_vect			// IRQ EL2t
+	invalid_host_el2_vect			// FIQ EL2t
+	invalid_host_el2_vect			// Error EL2t
+
+	invalid_host_el2_vect			// Synchronous EL2h
+	invalid_host_el2_vect			// IRQ EL2h
+	invalid_host_el2_vect			// FIQ EL2h
+	invalid_host_el2_vect			// Error EL2h
+
+	host_el1_sync_vect			// Synchronous 64-bit EL1/EL0
+	invalid_host_el1_vect			// IRQ 64-bit EL1/EL0
+	invalid_host_el1_vect			// FIQ 64-bit EL1/EL0
+	invalid_host_el1_vect			// Error 64-bit EL1/EL0
+
+	host_el1_sync_vect			// Synchronous 32-bit EL1/EL0
+	invalid_host_el1_vect			// IRQ 32-bit EL1/EL0
+	invalid_host_el1_vect			// FIQ 32-bit EL1/EL0
+	invalid_host_el1_vect			// Error 32-bit EL1/EL0
+SYM_CODE_END(__kvm_hyp_host_vector)
+
+/*
+ * Forward SMC with arguments in struct kvm_cpu_context, and
+ * store the result into the same struct. Assumes SMCCC 1.2 or older.
+ *
+ * x0: struct kvm_cpu_context*
+ */
+SYM_CODE_START(__kvm_hyp_host_forward_smc)
+	/*
+	 * Use x18 to keep the pointer to the host context because
+	 * x18 is callee-saved in SMCCC but not in AAPCS64.
+	 */
+	mov	x18, x0
+
+	ldp	x0, x1,   [x18, #CPU_XREG_OFFSET(0)]
+	ldp	x2, x3,   [x18, #CPU_XREG_OFFSET(2)]
+	ldp	x4, x5,   [x18, #CPU_XREG_OFFSET(4)]
+	ldp	x6, x7,   [x18, #CPU_XREG_OFFSET(6)]
+	ldp	x8, x9,   [x18, #CPU_XREG_OFFSET(8)]
+	ldp	x10, x11, [x18, #CPU_XREG_OFFSET(10)]
+	ldp	x12, x13, [x18, #CPU_XREG_OFFSET(12)]
+	ldp	x14, x15, [x18, #CPU_XREG_OFFSET(14)]
+	ldp	x16, x17, [x18, #CPU_XREG_OFFSET(16)]
+
+	smc	#0
+
+	stp	x0, x1,   [x18, #CPU_XREG_OFFSET(0)]
+	stp	x2, x3,   [x18, #CPU_XREG_OFFSET(2)]
+	stp	x4, x5,   [x18, #CPU_XREG_OFFSET(4)]
+	stp	x6, x7,   [x18, #CPU_XREG_OFFSET(6)]
+	stp	x8, x9,   [x18, #CPU_XREG_OFFSET(8)]
+	stp	x10, x11, [x18, #CPU_XREG_OFFSET(10)]
+	stp	x12, x13, [x18, #CPU_XREG_OFFSET(12)]
+	stp	x14, x15, [x18, #CPU_XREG_OFFSET(14)]
+	stp	x16, x17, [x18, #CPU_XREG_OFFSET(16)]
+
+	ret
+SYM_CODE_END(__kvm_hyp_host_forward_smc)
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
new file mode 100644
index 000000000..c953fb4b9
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -0,0 +1,271 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/linkage.h>
+
+#include <asm/alternative.h>
+#include <asm/assembler.h>
+#include <asm/el2_setup.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+#include <asm/pgtable-hwdef.h>
+#include <asm/sysreg.h>
+#include <asm/virt.h>
+
+	.text
+	.pushsection	.idmap.text, "ax"
+
+	.align	11
+
+SYM_CODE_START(__kvm_hyp_init)
+	ventry	__invalid		// Synchronous EL2t
+	ventry	__invalid		// IRQ EL2t
+	ventry	__invalid		// FIQ EL2t
+	ventry	__invalid		// Error EL2t
+
+	ventry	__invalid		// Synchronous EL2h
+	ventry	__invalid		// IRQ EL2h
+	ventry	__invalid		// FIQ EL2h
+	ventry	__invalid		// Error EL2h
+
+	ventry	__do_hyp_init		// Synchronous 64-bit EL1
+	ventry	__invalid		// IRQ 64-bit EL1
+	ventry	__invalid		// FIQ 64-bit EL1
+	ventry	__invalid		// Error 64-bit EL1
+
+	ventry	__invalid		// Synchronous 32-bit EL1
+	ventry	__invalid		// IRQ 32-bit EL1
+	ventry	__invalid		// FIQ 32-bit EL1
+	ventry	__invalid		// Error 32-bit EL1
+
+__invalid:
+	b	.
+
+	/*
+	 * Only uses x0..x3 so as to not clobber callee-saved SMCCC registers.
+	 *
+	 * x0: SMCCC function ID
+	 * x1: struct kvm_nvhe_init_params PA
+	 */
+__do_hyp_init:
+	/* Check for a stub HVC call */
+	cmp	x0, #HVC_STUB_HCALL_NR
+	b.lo	__kvm_handle_stub_hvc
+
+	mov	x3, #KVM_HOST_SMCCC_FUNC(__kvm_hyp_init)
+	cmp	x0, x3
+	b.eq	1f
+
+	mov	x0, #SMCCC_RET_NOT_SUPPORTED
+	eret
+
+1:	mov	x0, x1
+	mov	x3, lr
+	bl	___kvm_hyp_init			// Clobbers x0..x2
+	mov	lr, x3
+
+	/* Hello, World! */
+	mov	x0, #SMCCC_RET_SUCCESS
+	eret
+SYM_CODE_END(__kvm_hyp_init)
+
+/*
+ * Initialize the hypervisor in EL2.
+ *
+ * Only uses x0..x2 so as to not clobber callee-saved SMCCC registers
+ * and leave x3 for the caller.
+ *
+ * x0: struct kvm_nvhe_init_params PA
+ */
+SYM_CODE_START_LOCAL(___kvm_hyp_init)
+	ldr	x1, [x0, #NVHE_INIT_TPIDR_EL2]
+	msr	tpidr_el2, x1
+
+	ldr	x1, [x0, #NVHE_INIT_STACK_HYP_VA]
+	mov	sp, x1
+
+	ldr	x1, [x0, #NVHE_INIT_MAIR_EL2]
+	msr	mair_el2, x1
+
+	ldr	x1, [x0, #NVHE_INIT_HCR_EL2]
+	msr	hcr_el2, x1
+
+	ldr	x1, [x0, #NVHE_INIT_VTTBR]
+	msr	vttbr_el2, x1
+
+	ldr	x1, [x0, #NVHE_INIT_VTCR]
+	msr	vtcr_el2, x1
+
+	ldr	x1, [x0, #NVHE_INIT_PGD_PA]
+	phys_to_ttbr x2, x1
+alternative_if ARM64_HAS_CNP
+	orr	x2, x2, #TTBR_CNP_BIT
+alternative_else_nop_endif
+	msr	ttbr0_el2, x2
+
+	/*
+	 * Set the PS bits in TCR_EL2.
+	 */
+	ldr	x0, [x0, #NVHE_INIT_TCR_EL2]
+	tcr_compute_pa_size x0, #TCR_EL2_PS_SHIFT, x1, x2
+	msr	tcr_el2, x0
+
+	isb
+
+	/* Invalidate the stale TLBs from Bootloader */
+	tlbi	alle2
+	tlbi	vmalls12e1
+	dsb	sy
+
+	mov_q	x0, INIT_SCTLR_EL2_MMU_ON
+alternative_if ARM64_HAS_ADDRESS_AUTH
+	mov_q	x1, (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | \
+		     SCTLR_ELx_ENDA | SCTLR_ELx_ENDB)
+	orr	x0, x0, x1
+alternative_else_nop_endif
+	msr	sctlr_el2, x0
+	isb
+
+	/* Set the host vector */
+	ldr	x0, =__kvm_hyp_host_vector
+	msr	vbar_el2, x0
+
+	ret
+SYM_CODE_END(___kvm_hyp_init)
+
+/*
+ * PSCI CPU_ON entry point
+ *
+ * x0: struct kvm_nvhe_init_params PA
+ */
+SYM_CODE_START(kvm_hyp_cpu_entry)
+	mov	x1, #1				// is_cpu_on = true
+	b	__kvm_hyp_init_cpu
+SYM_CODE_END(kvm_hyp_cpu_entry)
+
+/*
+ * PSCI CPU_SUSPEND / SYSTEM_SUSPEND entry point
+ *
+ * x0: struct kvm_nvhe_init_params PA
+ */
+SYM_CODE_START(kvm_hyp_cpu_resume)
+	mov	x1, #0				// is_cpu_on = false
+	b	__kvm_hyp_init_cpu
+SYM_CODE_END(kvm_hyp_cpu_resume)
+
+/*
+ * Common code for CPU entry points. Initializes EL2 state and
+ * installs the hypervisor before handing over to a C handler.
+ *
+ * x0: struct kvm_nvhe_init_params PA
+ * x1: bool is_cpu_on
+ */
+SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu)
+	mov	x28, x0				// Stash arguments
+	mov	x29, x1
+
+	/* Check that the core was booted in EL2. */
+	mrs	x0, CurrentEL
+	cmp	x0, #CurrentEL_EL2
+	b.eq	2f
+
+	/* The core booted in EL1. KVM cannot be initialized on it. */
+1:	wfe
+	wfi
+	b	1b
+
+2:	msr	SPsel, #1			// We want to use SP_EL{1,2}
+
+	/* Initialize EL2 CPU state to sane values. */
+	init_el2_state				// Clobbers x0..x2
+
+	/* Enable MMU, set vectors and stack. */
+	mov	x0, x28
+	bl	___kvm_hyp_init			// Clobbers x0..x2
+
+	/* Leave idmap. */
+	mov	x0, x29
+	ldr	x1, =kvm_host_psci_cpu_entry
+	br	x1
+SYM_CODE_END(__kvm_hyp_init_cpu)
+
+SYM_CODE_START(__kvm_handle_stub_hvc)
+	cmp	x0, #HVC_SOFT_RESTART
+	b.ne	1f
+
+	/* This is where we're about to jump, staying at EL2 */
+	msr	elr_el2, x1
+	mov	x0, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT | PSR_MODE_EL2h)
+	msr	spsr_el2, x0
+
+	/* Shuffle the arguments, and don't come back */
+	mov	x0, x2
+	mov	x1, x3
+	mov	x2, x4
+	b	reset
+
+1:	cmp	x0, #HVC_RESET_VECTORS
+	b.ne	1f
+
+	/*
+	 * Set the HVC_RESET_VECTORS return code before entering the common
+	 * path so that we do not clobber x0-x2 in case we are coming via
+	 * HVC_SOFT_RESTART.
+	 */
+	mov	x0, xzr
+reset:
+	/* Reset kvm back to the hyp stub. */
+	mov_q	x5, INIT_SCTLR_EL2_MMU_OFF
+	pre_disable_mmu_workaround
+	msr	sctlr_el2, x5
+	isb
+
+alternative_if ARM64_KVM_PROTECTED_MODE
+	mov_q	x5, HCR_HOST_NVHE_FLAGS
+	msr	hcr_el2, x5
+alternative_else_nop_endif
+
+	/* Install stub vectors */
+	adr_l	x5, __hyp_stub_vectors
+	msr	vbar_el2, x5
+	eret
+
+1:	/* Bad stub call */
+	mov_q	x0, HVC_STUB_ERR
+	eret
+
+SYM_CODE_END(__kvm_handle_stub_hvc)
+
+SYM_FUNC_START(__pkvm_init_switch_pgd)
+	/* Turn the MMU off */
+	pre_disable_mmu_workaround
+	mrs	x2, sctlr_el2
+	bic	x3, x2, #SCTLR_ELx_M
+	msr	sctlr_el2, x3
+	isb
+
+	tlbi	alle2
+
+	/* Install the new pgtables */
+	ldr	x3, [x0, #NVHE_INIT_PGD_PA]
+	phys_to_ttbr x4, x3
+alternative_if ARM64_HAS_CNP
+	orr	x4, x4, #TTBR_CNP_BIT
+alternative_else_nop_endif
+	msr	ttbr0_el2, x4
+
+	/* Set the new stack pointer */
+	ldr	x0, [x0, #NVHE_INIT_STACK_HYP_VA]
+	mov	sp, x0
+
+	/* And turn the MMU back on! */
+	set_sctlr_el2	x2
+	ret	x1
+SYM_FUNC_END(__pkvm_init_switch_pgd)
+
+	.popsection
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
new file mode 100644
index 000000000..3cea4b6ac
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -0,0 +1,300 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 - Google Inc
+ * Author: Andrew Scull <ascull@google.com>
+ */
+
+#include <hyp/adjust_pc.h>
+
+#include <asm/pgtable-types.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_host.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+#include <nvhe/mem_protect.h>
+#include <nvhe/mm.h>
+#include <nvhe/trap_handler.h>
+
+DEFINE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
+
+void __kvm_hyp_host_forward_smc(struct kvm_cpu_context *host_ctxt);
+
+static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1);
+
+	cpu_reg(host_ctxt, 1) =  __kvm_vcpu_run(kern_hyp_va(vcpu));
+}
+
+static void handle___kvm_adjust_pc(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1);
+
+	__kvm_adjust_pc(kern_hyp_va(vcpu));
+}
+
+static void handle___kvm_flush_vm_context(struct kvm_cpu_context *host_ctxt)
+{
+	__kvm_flush_vm_context();
+}
+
+static void handle___kvm_tlb_flush_vmid_ipa(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
+	DECLARE_REG(phys_addr_t, ipa, host_ctxt, 2);
+	DECLARE_REG(int, level, host_ctxt, 3);
+
+	__kvm_tlb_flush_vmid_ipa(kern_hyp_va(mmu), ipa, level);
+}
+
+static void handle___kvm_tlb_flush_vmid(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
+
+	__kvm_tlb_flush_vmid(kern_hyp_va(mmu));
+}
+
+static void handle___kvm_flush_cpu_context(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
+
+	__kvm_flush_cpu_context(kern_hyp_va(mmu));
+}
+
+static void handle___kvm_timer_set_cntvoff(struct kvm_cpu_context *host_ctxt)
+{
+	__kvm_timer_set_cntvoff(cpu_reg(host_ctxt, 1));
+}
+
+static void handle___kvm_enable_ssbs(struct kvm_cpu_context *host_ctxt)
+{
+	u64 tmp;
+
+	tmp = read_sysreg_el2(SYS_SCTLR);
+	tmp |= SCTLR_ELx_DSSBS;
+	write_sysreg_el2(tmp, SYS_SCTLR);
+}
+
+static void handle___vgic_v3_get_gic_config(struct kvm_cpu_context *host_ctxt)
+{
+	cpu_reg(host_ctxt, 1) = __vgic_v3_get_gic_config();
+}
+
+static void handle___vgic_v3_read_vmcr(struct kvm_cpu_context *host_ctxt)
+{
+	cpu_reg(host_ctxt, 1) = __vgic_v3_read_vmcr();
+}
+
+static void handle___vgic_v3_write_vmcr(struct kvm_cpu_context *host_ctxt)
+{
+	__vgic_v3_write_vmcr(cpu_reg(host_ctxt, 1));
+}
+
+static void handle___vgic_v3_init_lrs(struct kvm_cpu_context *host_ctxt)
+{
+	__vgic_v3_init_lrs();
+}
+
+static void handle___kvm_get_mdcr_el2(struct kvm_cpu_context *host_ctxt)
+{
+	cpu_reg(host_ctxt, 1) = __kvm_get_mdcr_el2();
+}
+
+static void handle___vgic_v3_save_aprs(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct vgic_v3_cpu_if *, cpu_if, host_ctxt, 1);
+
+	__vgic_v3_save_aprs(kern_hyp_va(cpu_if));
+}
+
+static void handle___vgic_v3_restore_aprs(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct vgic_v3_cpu_if *, cpu_if, host_ctxt, 1);
+
+	__vgic_v3_restore_aprs(kern_hyp_va(cpu_if));
+}
+
+static void handle___pkvm_init(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
+	DECLARE_REG(unsigned long, size, host_ctxt, 2);
+	DECLARE_REG(unsigned long, nr_cpus, host_ctxt, 3);
+	DECLARE_REG(unsigned long *, per_cpu_base, host_ctxt, 4);
+	DECLARE_REG(u32, hyp_va_bits, host_ctxt, 5);
+
+	/*
+	 * __pkvm_init() will return only if an error occurred, otherwise it
+	 * will tail-call in __pkvm_init_finalise() which will have to deal
+	 * with the host context directly.
+	 */
+	cpu_reg(host_ctxt, 1) = __pkvm_init(phys, size, nr_cpus, per_cpu_base,
+					    hyp_va_bits);
+}
+
+static void handle___pkvm_cpu_set_vector(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(enum arm64_hyp_spectre_vector, slot, host_ctxt, 1);
+
+	cpu_reg(host_ctxt, 1) = pkvm_cpu_set_vector(slot);
+}
+
+static void handle___pkvm_host_share_hyp(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(u64, pfn, host_ctxt, 1);
+
+	cpu_reg(host_ctxt, 1) = __pkvm_host_share_hyp(pfn);
+}
+
+static void handle___pkvm_host_unshare_hyp(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(u64, pfn, host_ctxt, 1);
+
+	cpu_reg(host_ctxt, 1) = __pkvm_host_unshare_hyp(pfn);
+}
+
+static void handle___pkvm_create_private_mapping(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
+	DECLARE_REG(size_t, size, host_ctxt, 2);
+	DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 3);
+
+	/*
+	 * __pkvm_create_private_mapping() populates a pointer with the
+	 * hypervisor start address of the allocation.
+	 *
+	 * However, handle___pkvm_create_private_mapping() hypercall crosses the
+	 * EL1/EL2 boundary so the pointer would not be valid in this context.
+	 *
+	 * Instead pass the allocation address as the return value (or return
+	 * ERR_PTR() on failure).
+	 */
+	unsigned long haddr;
+	int err = __pkvm_create_private_mapping(phys, size, prot, &haddr);
+
+	if (err)
+		haddr = (unsigned long)ERR_PTR(err);
+
+	cpu_reg(host_ctxt, 1) = haddr;
+}
+
+static void handle___pkvm_prot_finalize(struct kvm_cpu_context *host_ctxt)
+{
+	cpu_reg(host_ctxt, 1) = __pkvm_prot_finalize();
+}
+
+static void handle___pkvm_vcpu_init_traps(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1);
+
+	__pkvm_vcpu_init_traps(kern_hyp_va(vcpu));
+}
+
+typedef void (*hcall_t)(struct kvm_cpu_context *);
+
+#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
+
+static const hcall_t host_hcall[] = {
+	/* ___kvm_hyp_init */
+	HANDLE_FUNC(__kvm_get_mdcr_el2),
+	HANDLE_FUNC(__pkvm_init),
+	HANDLE_FUNC(__pkvm_create_private_mapping),
+	HANDLE_FUNC(__pkvm_cpu_set_vector),
+	HANDLE_FUNC(__kvm_enable_ssbs),
+	HANDLE_FUNC(__vgic_v3_init_lrs),
+	HANDLE_FUNC(__vgic_v3_get_gic_config),
+	HANDLE_FUNC(__pkvm_prot_finalize),
+
+	HANDLE_FUNC(__pkvm_host_share_hyp),
+	HANDLE_FUNC(__pkvm_host_unshare_hyp),
+	HANDLE_FUNC(__kvm_adjust_pc),
+	HANDLE_FUNC(__kvm_vcpu_run),
+	HANDLE_FUNC(__kvm_flush_vm_context),
+	HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
+	HANDLE_FUNC(__kvm_tlb_flush_vmid),
+	HANDLE_FUNC(__kvm_flush_cpu_context),
+	HANDLE_FUNC(__kvm_timer_set_cntvoff),
+	HANDLE_FUNC(__vgic_v3_read_vmcr),
+	HANDLE_FUNC(__vgic_v3_write_vmcr),
+	HANDLE_FUNC(__vgic_v3_save_aprs),
+	HANDLE_FUNC(__vgic_v3_restore_aprs),
+	HANDLE_FUNC(__pkvm_vcpu_init_traps),
+};
+
+static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(unsigned long, id, host_ctxt, 0);
+	unsigned long hcall_min = 0;
+	hcall_t hfn;
+
+	/*
+	 * If pKVM has been initialised then reject any calls to the
+	 * early "privileged" hypercalls. Note that we cannot reject
+	 * calls to __pkvm_prot_finalize for two reasons: (1) The static
+	 * key used to determine initialisation must be toggled prior to
+	 * finalisation and (2) finalisation is performed on a per-CPU
+	 * basis. This is all fine, however, since __pkvm_prot_finalize
+	 * returns -EPERM after the first call for a given CPU.
+	 */
+	if (static_branch_unlikely(&kvm_protected_mode_initialized))
+		hcall_min = __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize;
+
+	id -= KVM_HOST_SMCCC_ID(0);
+
+	if (unlikely(id < hcall_min || id >= ARRAY_SIZE(host_hcall)))
+		goto inval;
+
+	hfn = host_hcall[id];
+	if (unlikely(!hfn))
+		goto inval;
+
+	cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
+	hfn(host_ctxt);
+
+	return;
+inval:
+	cpu_reg(host_ctxt, 0) = SMCCC_RET_NOT_SUPPORTED;
+}
+
+static void default_host_smc_handler(struct kvm_cpu_context *host_ctxt)
+{
+	__kvm_hyp_host_forward_smc(host_ctxt);
+}
+
+static void handle_host_smc(struct kvm_cpu_context *host_ctxt)
+{
+	bool handled;
+
+	handled = kvm_host_psci_handler(host_ctxt);
+	if (!handled)
+		default_host_smc_handler(host_ctxt);
+
+	/* SMC was trapped, move ELR past the current PC. */
+	kvm_skip_host_instr();
+}
+
+void handle_trap(struct kvm_cpu_context *host_ctxt)
+{
+	u64 esr = read_sysreg_el2(SYS_ESR);
+
+	switch (ESR_ELx_EC(esr)) {
+	case ESR_ELx_EC_HVC64:
+		handle_host_hcall(host_ctxt);
+		break;
+	case ESR_ELx_EC_SMC64:
+		handle_host_smc(host_ctxt);
+		break;
+	case ESR_ELx_EC_SVE:
+		sysreg_clear_set(cptr_el2, CPTR_EL2_TZ, 0);
+		isb();
+		sve_cond_update_zcr_vq(ZCR_ELx_LEN_MASK, SYS_ZCR_EL2);
+		break;
+	case ESR_ELx_EC_IABT_LOW:
+	case ESR_ELx_EC_DABT_LOW:
+		handle_host_mem_abort(host_ctxt);
+		break;
+	default:
+		BUG();
+	}
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
new file mode 100644
index 000000000..9f54833af
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: David Brazdil <dbrazdil@google.com>
+ */
+
+#include <asm/kvm_asm.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+/*
+ * nVHE copy of data structures tracking available CPU cores.
+ * Only entries for CPUs that were online at KVM init are populated.
+ * Other CPUs should not be allowed to boot because their features were
+ * not checked against the finalized system capabilities.
+ */
+u64 __ro_after_init hyp_cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
+
+u64 cpu_logical_map(unsigned int cpu)
+{
+	BUG_ON(cpu >= ARRAY_SIZE(hyp_cpu_logical_map));
+
+	return hyp_cpu_logical_map[cpu];
+}
+
+unsigned long __hyp_per_cpu_offset(unsigned int cpu)
+{
+	unsigned long *cpu_base_array;
+	unsigned long this_cpu_base;
+	unsigned long elf_base;
+
+	BUG_ON(cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base));
+
+	cpu_base_array = (unsigned long *)&kvm_arm_hyp_percpu_base;
+	this_cpu_base = kern_hyp_va(cpu_base_array[cpu]);
+	elf_base = (unsigned long)&__per_cpu_start;
+	return this_cpu_base - elf_base;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
new file mode 100644
index 000000000..f4562f417
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 Google LLC.
+ * Written by David Brazdil <dbrazdil@google.com>
+ *
+ * Linker script used for partial linking of nVHE EL2 object files.
+ */
+
+#include <asm/hyp_image.h>
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/cache.h>
+#include <asm/memory.h>
+
+SECTIONS {
+	HYP_SECTION(.idmap.text)
+	HYP_SECTION(.text)
+	HYP_SECTION(.data..ro_after_init)
+	HYP_SECTION(.rodata)
+
+	/*
+	 * .hyp..data..percpu needs to be page aligned to maintain the same
+	 * alignment for when linking into vmlinux.
+	 */
+	. = ALIGN(PAGE_SIZE);
+	BEGIN_HYP_SECTION(.data..percpu)
+		PERCPU_INPUT(L1_CACHE_BYTES)
+	END_HYP_SECTION
+	HYP_SECTION(.bss)
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/list_debug.c b/arch/arm64/kvm/hyp/nvhe/list_debug.c
new file mode 100644
index 000000000..d68abd7ea
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/list_debug.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 - Google LLC
+ * Author: Keir Fraser <keirf@google.com>
+ */
+
+#include <linux/list.h>
+#include <linux/bug.h>
+
+static inline __must_check bool nvhe_check_data_corruption(bool v)
+{
+	return v;
+}
+
+#define NVHE_CHECK_DATA_CORRUPTION(condition)				 \
+	nvhe_check_data_corruption(({					 \
+		bool corruption = unlikely(condition);			 \
+		if (corruption) {					 \
+			if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
+				BUG_ON(1);				 \
+			} else						 \
+				WARN_ON(1);				 \
+		}							 \
+		corruption;						 \
+	}))
+
+/* The predicates checked here are taken from lib/list_debug.c. */
+
+bool __list_add_valid(struct list_head *new, struct list_head *prev,
+		      struct list_head *next)
+{
+	if (NVHE_CHECK_DATA_CORRUPTION(next->prev != prev) ||
+	    NVHE_CHECK_DATA_CORRUPTION(prev->next != next) ||
+	    NVHE_CHECK_DATA_CORRUPTION(new == prev || new == next))
+		return false;
+
+	return true;
+}
+
+bool __list_del_entry_valid(struct list_head *entry)
+{
+	struct list_head *prev, *next;
+
+	prev = entry->prev;
+	next = entry->next;
+
+	if (NVHE_CHECK_DATA_CORRUPTION(next == LIST_POISON1) ||
+	    NVHE_CHECK_DATA_CORRUPTION(prev == LIST_POISON2) ||
+	    NVHE_CHECK_DATA_CORRUPTION(prev->next != entry) ||
+	    NVHE_CHECK_DATA_CORRUPTION(next->prev != entry))
+		return false;
+
+	return true;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
new file mode 100644
index 000000000..07f9dc984
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -0,0 +1,799 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/kvm_pkvm.h>
+#include <asm/stage2_pgtable.h>
+
+#include <hyp/fault.h>
+
+#include <nvhe/gfp.h>
+#include <nvhe/memory.h>
+#include <nvhe/mem_protect.h>
+#include <nvhe/mm.h>
+
+#define KVM_HOST_S2_FLAGS (KVM_PGTABLE_S2_NOFWB | KVM_PGTABLE_S2_IDMAP)
+
+extern unsigned long hyp_nr_cpus;
+struct host_kvm host_kvm;
+
+static struct hyp_pool host_s2_pool;
+
+const u8 pkvm_hyp_id = 1;
+
+static void host_lock_component(void)
+{
+	hyp_spin_lock(&host_kvm.lock);
+}
+
+static void host_unlock_component(void)
+{
+	hyp_spin_unlock(&host_kvm.lock);
+}
+
+static void hyp_lock_component(void)
+{
+	hyp_spin_lock(&pkvm_pgd_lock);
+}
+
+static void hyp_unlock_component(void)
+{
+	hyp_spin_unlock(&pkvm_pgd_lock);
+}
+
+static void *host_s2_zalloc_pages_exact(size_t size)
+{
+	void *addr = hyp_alloc_pages(&host_s2_pool, get_order(size));
+
+	hyp_split_page(hyp_virt_to_page(addr));
+
+	/*
+	 * The size of concatenated PGDs is always a power of two of PAGE_SIZE,
+	 * so there should be no need to free any of the tail pages to make the
+	 * allocation exact.
+	 */
+	WARN_ON(size != (PAGE_SIZE << get_order(size)));
+
+	return addr;
+}
+
+static void *host_s2_zalloc_page(void *pool)
+{
+	return hyp_alloc_pages(pool, 0);
+}
+
+static void host_s2_get_page(void *addr)
+{
+	hyp_get_page(&host_s2_pool, addr);
+}
+
+static void host_s2_put_page(void *addr)
+{
+	hyp_put_page(&host_s2_pool, addr);
+}
+
+static int prepare_s2_pool(void *pgt_pool_base)
+{
+	unsigned long nr_pages, pfn;
+	int ret;
+
+	pfn = hyp_virt_to_pfn(pgt_pool_base);
+	nr_pages = host_s2_pgtable_pages();
+	ret = hyp_pool_init(&host_s2_pool, pfn, nr_pages, 0);
+	if (ret)
+		return ret;
+
+	host_kvm.mm_ops = (struct kvm_pgtable_mm_ops) {
+		.zalloc_pages_exact = host_s2_zalloc_pages_exact,
+		.zalloc_page = host_s2_zalloc_page,
+		.phys_to_virt = hyp_phys_to_virt,
+		.virt_to_phys = hyp_virt_to_phys,
+		.page_count = hyp_page_count,
+		.get_page = host_s2_get_page,
+		.put_page = host_s2_put_page,
+	};
+
+	return 0;
+}
+
+static void prepare_host_vtcr(void)
+{
+	u32 parange, phys_shift;
+
+	/* The host stage 2 is id-mapped, so use parange for T0SZ */
+	parange = kvm_get_parange(id_aa64mmfr0_el1_sys_val);
+	phys_shift = id_aa64mmfr0_parange_to_phys_shift(parange);
+
+	host_kvm.arch.vtcr = kvm_get_vtcr(id_aa64mmfr0_el1_sys_val,
+					  id_aa64mmfr1_el1_sys_val, phys_shift);
+}
+
+static bool host_stage2_force_pte_cb(u64 addr, u64 end, enum kvm_pgtable_prot prot);
+
+int kvm_host_prepare_stage2(void *pgt_pool_base)
+{
+	struct kvm_s2_mmu *mmu = &host_kvm.arch.mmu;
+	int ret;
+
+	prepare_host_vtcr();
+	hyp_spin_lock_init(&host_kvm.lock);
+	mmu->arch = &host_kvm.arch;
+
+	ret = prepare_s2_pool(pgt_pool_base);
+	if (ret)
+		return ret;
+
+	ret = __kvm_pgtable_stage2_init(&host_kvm.pgt, mmu,
+					&host_kvm.mm_ops, KVM_HOST_S2_FLAGS,
+					host_stage2_force_pte_cb);
+	if (ret)
+		return ret;
+
+	mmu->pgd_phys = __hyp_pa(host_kvm.pgt.pgd);
+	mmu->pgt = &host_kvm.pgt;
+	atomic64_set(&mmu->vmid.id, 0);
+
+	return 0;
+}
+
+int __pkvm_prot_finalize(void)
+{
+	struct kvm_s2_mmu *mmu = &host_kvm.arch.mmu;
+	struct kvm_nvhe_init_params *params = this_cpu_ptr(&kvm_init_params);
+
+	if (params->hcr_el2 & HCR_VM)
+		return -EPERM;
+
+	params->vttbr = kvm_get_vttbr(mmu);
+	params->vtcr = host_kvm.arch.vtcr;
+	params->hcr_el2 |= HCR_VM;
+	kvm_flush_dcache_to_poc(params, sizeof(*params));
+
+	write_sysreg(params->hcr_el2, hcr_el2);
+	__load_stage2(&host_kvm.arch.mmu, &host_kvm.arch);
+
+	/*
+	 * Make sure to have an ISB before the TLB maintenance below but only
+	 * when __load_stage2() doesn't include one already.
+	 */
+	asm(ALTERNATIVE("isb", "nop", ARM64_WORKAROUND_SPECULATIVE_AT));
+
+	/* Invalidate stale HCR bits that may be cached in TLBs */
+	__tlbi(vmalls12e1);
+	dsb(nsh);
+	isb();
+
+	return 0;
+}
+
+static int host_stage2_unmap_dev_all(void)
+{
+	struct kvm_pgtable *pgt = &host_kvm.pgt;
+	struct memblock_region *reg;
+	u64 addr = 0;
+	int i, ret;
+
+	/* Unmap all non-memory regions to recycle the pages */
+	for (i = 0; i < hyp_memblock_nr; i++, addr = reg->base + reg->size) {
+		reg = &hyp_memory[i];
+		ret = kvm_pgtable_stage2_unmap(pgt, addr, reg->base - addr);
+		if (ret)
+			return ret;
+	}
+	return kvm_pgtable_stage2_unmap(pgt, addr, BIT(pgt->ia_bits) - addr);
+}
+
+struct kvm_mem_range {
+	u64 start;
+	u64 end;
+};
+
+static bool find_mem_range(phys_addr_t addr, struct kvm_mem_range *range)
+{
+	int cur, left = 0, right = hyp_memblock_nr;
+	struct memblock_region *reg;
+	phys_addr_t end;
+
+	range->start = 0;
+	range->end = ULONG_MAX;
+
+	/* The list of memblock regions is sorted, binary search it */
+	while (left < right) {
+		cur = (left + right) >> 1;
+		reg = &hyp_memory[cur];
+		end = reg->base + reg->size;
+		if (addr < reg->base) {
+			right = cur;
+			range->end = reg->base;
+		} else if (addr >= end) {
+			left = cur + 1;
+			range->start = end;
+		} else {
+			range->start = reg->base;
+			range->end = end;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool addr_is_memory(phys_addr_t phys)
+{
+	struct kvm_mem_range range;
+
+	return find_mem_range(phys, &range);
+}
+
+static bool is_in_mem_range(u64 addr, struct kvm_mem_range *range)
+{
+	return range->start <= addr && addr < range->end;
+}
+
+static bool range_is_memory(u64 start, u64 end)
+{
+	struct kvm_mem_range r;
+
+	if (!find_mem_range(start, &r))
+		return false;
+
+	return is_in_mem_range(end - 1, &r);
+}
+
+static inline int __host_stage2_idmap(u64 start, u64 end,
+				      enum kvm_pgtable_prot prot)
+{
+	return kvm_pgtable_stage2_map(&host_kvm.pgt, start, end - start, start,
+				      prot, &host_s2_pool);
+}
+
+/*
+ * The pool has been provided with enough pages to cover all of memory with
+ * page granularity, but it is difficult to know how much of the MMIO range
+ * we will need to cover upfront, so we may need to 'recycle' the pages if we
+ * run out.
+ */
+#define host_stage2_try(fn, ...)					\
+	({								\
+		int __ret;						\
+		hyp_assert_lock_held(&host_kvm.lock);			\
+		__ret = fn(__VA_ARGS__);				\
+		if (__ret == -ENOMEM) {					\
+			__ret = host_stage2_unmap_dev_all();		\
+			if (!__ret)					\
+				__ret = fn(__VA_ARGS__);		\
+		}							\
+		__ret;							\
+	 })
+
+static inline bool range_included(struct kvm_mem_range *child,
+				  struct kvm_mem_range *parent)
+{
+	return parent->start <= child->start && child->end <= parent->end;
+}
+
+static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
+{
+	struct kvm_mem_range cur;
+	kvm_pte_t pte;
+	u32 level;
+	int ret;
+
+	hyp_assert_lock_held(&host_kvm.lock);
+	ret = kvm_pgtable_get_leaf(&host_kvm.pgt, addr, &pte, &level);
+	if (ret)
+		return ret;
+
+	if (kvm_pte_valid(pte))
+		return -EAGAIN;
+
+	if (pte)
+		return -EPERM;
+
+	do {
+		u64 granule = kvm_granule_size(level);
+		cur.start = ALIGN_DOWN(addr, granule);
+		cur.end = cur.start + granule;
+		level++;
+	} while ((level < KVM_PGTABLE_MAX_LEVELS) &&
+			!(kvm_level_supports_block_mapping(level) &&
+			  range_included(&cur, range)));
+
+	*range = cur;
+
+	return 0;
+}
+
+int host_stage2_idmap_locked(phys_addr_t addr, u64 size,
+			     enum kvm_pgtable_prot prot)
+{
+	return host_stage2_try(__host_stage2_idmap, addr, addr + size, prot);
+}
+
+int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id)
+{
+	return host_stage2_try(kvm_pgtable_stage2_set_owner, &host_kvm.pgt,
+			       addr, size, &host_s2_pool, owner_id);
+}
+
+static bool host_stage2_force_pte_cb(u64 addr, u64 end, enum kvm_pgtable_prot prot)
+{
+	/*
+	 * Block mappings must be used with care in the host stage-2 as a
+	 * kvm_pgtable_stage2_map() operation targeting a page in the range of
+	 * an existing block will delete the block under the assumption that
+	 * mappings in the rest of the block range can always be rebuilt lazily.
+	 * That assumption is correct for the host stage-2 with RWX mappings
+	 * targeting memory or RW mappings targeting MMIO ranges (see
+	 * host_stage2_idmap() below which implements some of the host memory
+	 * abort logic). However, this is not safe for any other mappings where
+	 * the host stage-2 page-table is in fact the only place where this
+	 * state is stored. In all those cases, it is safer to use page-level
+	 * mappings, hence avoiding to lose the state because of side-effects in
+	 * kvm_pgtable_stage2_map().
+	 */
+	if (range_is_memory(addr, end))
+		return prot != PKVM_HOST_MEM_PROT;
+	else
+		return prot != PKVM_HOST_MMIO_PROT;
+}
+
+static int host_stage2_idmap(u64 addr)
+{
+	struct kvm_mem_range range;
+	bool is_memory = find_mem_range(addr, &range);
+	enum kvm_pgtable_prot prot;
+	int ret;
+
+	prot = is_memory ? PKVM_HOST_MEM_PROT : PKVM_HOST_MMIO_PROT;
+
+	host_lock_component();
+	ret = host_stage2_adjust_range(addr, &range);
+	if (ret)
+		goto unlock;
+
+	ret = host_stage2_idmap_locked(range.start, range.end - range.start, prot);
+unlock:
+	host_unlock_component();
+
+	return ret;
+}
+
+void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt)
+{
+	struct kvm_vcpu_fault_info fault;
+	u64 esr, addr;
+	int ret = 0;
+
+	esr = read_sysreg_el2(SYS_ESR);
+	BUG_ON(!__get_fault_info(esr, &fault));
+
+	addr = (fault.hpfar_el2 & HPFAR_MASK) << 8;
+	ret = host_stage2_idmap(addr);
+	BUG_ON(ret && ret != -EAGAIN);
+}
+
+/* This corresponds to locking order */
+enum pkvm_component_id {
+	PKVM_ID_HOST,
+	PKVM_ID_HYP,
+};
+
+struct pkvm_mem_transition {
+	u64				nr_pages;
+
+	struct {
+		enum pkvm_component_id	id;
+		/* Address in the initiator's address space */
+		u64			addr;
+
+		union {
+			struct {
+				/* Address in the completer's address space */
+				u64	completer_addr;
+			} host;
+		};
+	} initiator;
+
+	struct {
+		enum pkvm_component_id	id;
+	} completer;
+};
+
+struct pkvm_mem_share {
+	const struct pkvm_mem_transition	tx;
+	const enum kvm_pgtable_prot		completer_prot;
+};
+
+struct check_walk_data {
+	enum pkvm_page_state	desired;
+	enum pkvm_page_state	(*get_page_state)(kvm_pte_t pte);
+};
+
+static int __check_page_state_visitor(u64 addr, u64 end, u32 level,
+				      kvm_pte_t *ptep,
+				      enum kvm_pgtable_walk_flags flag,
+				      void * const arg)
+{
+	struct check_walk_data *d = arg;
+	kvm_pte_t pte = *ptep;
+
+	if (kvm_pte_valid(pte) && !addr_is_memory(kvm_pte_to_phys(pte)))
+		return -EINVAL;
+
+	return d->get_page_state(pte) == d->desired ? 0 : -EPERM;
+}
+
+static int check_page_state_range(struct kvm_pgtable *pgt, u64 addr, u64 size,
+				  struct check_walk_data *data)
+{
+	struct kvm_pgtable_walker walker = {
+		.cb	= __check_page_state_visitor,
+		.arg	= data,
+		.flags	= KVM_PGTABLE_WALK_LEAF,
+	};
+
+	return kvm_pgtable_walk(pgt, addr, size, &walker);
+}
+
+static enum pkvm_page_state host_get_page_state(kvm_pte_t pte)
+{
+	if (!kvm_pte_valid(pte) && pte)
+		return PKVM_NOPAGE;
+
+	return pkvm_getstate(kvm_pgtable_stage2_pte_prot(pte));
+}
+
+static int __host_check_page_state_range(u64 addr, u64 size,
+					 enum pkvm_page_state state)
+{
+	struct check_walk_data d = {
+		.desired	= state,
+		.get_page_state	= host_get_page_state,
+	};
+
+	hyp_assert_lock_held(&host_kvm.lock);
+	return check_page_state_range(&host_kvm.pgt, addr, size, &d);
+}
+
+static int __host_set_page_state_range(u64 addr, u64 size,
+				       enum pkvm_page_state state)
+{
+	enum kvm_pgtable_prot prot = pkvm_mkstate(PKVM_HOST_MEM_PROT, state);
+
+	return host_stage2_idmap_locked(addr, size, prot);
+}
+
+static int host_request_owned_transition(u64 *completer_addr,
+					 const struct pkvm_mem_transition *tx)
+{
+	u64 size = tx->nr_pages * PAGE_SIZE;
+	u64 addr = tx->initiator.addr;
+
+	*completer_addr = tx->initiator.host.completer_addr;
+	return __host_check_page_state_range(addr, size, PKVM_PAGE_OWNED);
+}
+
+static int host_request_unshare(u64 *completer_addr,
+				const struct pkvm_mem_transition *tx)
+{
+	u64 size = tx->nr_pages * PAGE_SIZE;
+	u64 addr = tx->initiator.addr;
+
+	*completer_addr = tx->initiator.host.completer_addr;
+	return __host_check_page_state_range(addr, size, PKVM_PAGE_SHARED_OWNED);
+}
+
+static int host_initiate_share(u64 *completer_addr,
+			       const struct pkvm_mem_transition *tx)
+{
+	u64 size = tx->nr_pages * PAGE_SIZE;
+	u64 addr = tx->initiator.addr;
+
+	*completer_addr = tx->initiator.host.completer_addr;
+	return __host_set_page_state_range(addr, size, PKVM_PAGE_SHARED_OWNED);
+}
+
+static int host_initiate_unshare(u64 *completer_addr,
+				 const struct pkvm_mem_transition *tx)
+{
+	u64 size = tx->nr_pages * PAGE_SIZE;
+	u64 addr = tx->initiator.addr;
+
+	*completer_addr = tx->initiator.host.completer_addr;
+	return __host_set_page_state_range(addr, size, PKVM_PAGE_OWNED);
+}
+
+static enum pkvm_page_state hyp_get_page_state(kvm_pte_t pte)
+{
+	if (!kvm_pte_valid(pte))
+		return PKVM_NOPAGE;
+
+	return pkvm_getstate(kvm_pgtable_hyp_pte_prot(pte));
+}
+
+static int __hyp_check_page_state_range(u64 addr, u64 size,
+					enum pkvm_page_state state)
+{
+	struct check_walk_data d = {
+		.desired	= state,
+		.get_page_state	= hyp_get_page_state,
+	};
+
+	hyp_assert_lock_held(&pkvm_pgd_lock);
+	return check_page_state_range(&pkvm_pgtable, addr, size, &d);
+}
+
+static bool __hyp_ack_skip_pgtable_check(const struct pkvm_mem_transition *tx)
+{
+	return !(IS_ENABLED(CONFIG_NVHE_EL2_DEBUG) ||
+		 tx->initiator.id != PKVM_ID_HOST);
+}
+
+static int hyp_ack_share(u64 addr, const struct pkvm_mem_transition *tx,
+			 enum kvm_pgtable_prot perms)
+{
+	u64 size = tx->nr_pages * PAGE_SIZE;
+
+	if (perms != PAGE_HYP)
+		return -EPERM;
+
+	if (__hyp_ack_skip_pgtable_check(tx))
+		return 0;
+
+	return __hyp_check_page_state_range(addr, size, PKVM_NOPAGE);
+}
+
+static int hyp_ack_unshare(u64 addr, const struct pkvm_mem_transition *tx)
+{
+	u64 size = tx->nr_pages * PAGE_SIZE;
+
+	if (__hyp_ack_skip_pgtable_check(tx))
+		return 0;
+
+	return __hyp_check_page_state_range(addr, size,
+					    PKVM_PAGE_SHARED_BORROWED);
+}
+
+static int hyp_complete_share(u64 addr, const struct pkvm_mem_transition *tx,
+			      enum kvm_pgtable_prot perms)
+{
+	void *start = (void *)addr, *end = start + (tx->nr_pages * PAGE_SIZE);
+	enum kvm_pgtable_prot prot;
+
+	prot = pkvm_mkstate(perms, PKVM_PAGE_SHARED_BORROWED);
+	return pkvm_create_mappings_locked(start, end, prot);
+}
+
+static int hyp_complete_unshare(u64 addr, const struct pkvm_mem_transition *tx)
+{
+	u64 size = tx->nr_pages * PAGE_SIZE;
+	int ret = kvm_pgtable_hyp_unmap(&pkvm_pgtable, addr, size);
+
+	return (ret != size) ? -EFAULT : 0;
+}
+
+static int check_share(struct pkvm_mem_share *share)
+{
+	const struct pkvm_mem_transition *tx = &share->tx;
+	u64 completer_addr;
+	int ret;
+
+	switch (tx->initiator.id) {
+	case PKVM_ID_HOST:
+		ret = host_request_owned_transition(&completer_addr, tx);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	switch (tx->completer.id) {
+	case PKVM_ID_HYP:
+		ret = hyp_ack_share(completer_addr, tx, share->completer_prot);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int __do_share(struct pkvm_mem_share *share)
+{
+	const struct pkvm_mem_transition *tx = &share->tx;
+	u64 completer_addr;
+	int ret;
+
+	switch (tx->initiator.id) {
+	case PKVM_ID_HOST:
+		ret = host_initiate_share(&completer_addr, tx);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	switch (tx->completer.id) {
+	case PKVM_ID_HYP:
+		ret = hyp_complete_share(completer_addr, tx, share->completer_prot);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+/*
+ * do_share():
+ *
+ * The page owner grants access to another component with a given set
+ * of permissions.
+ *
+ * Initiator: OWNED	=> SHARED_OWNED
+ * Completer: NOPAGE	=> SHARED_BORROWED
+ */
+static int do_share(struct pkvm_mem_share *share)
+{
+	int ret;
+
+	ret = check_share(share);
+	if (ret)
+		return ret;
+
+	return WARN_ON(__do_share(share));
+}
+
+static int check_unshare(struct pkvm_mem_share *share)
+{
+	const struct pkvm_mem_transition *tx = &share->tx;
+	u64 completer_addr;
+	int ret;
+
+	switch (tx->initiator.id) {
+	case PKVM_ID_HOST:
+		ret = host_request_unshare(&completer_addr, tx);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	switch (tx->completer.id) {
+	case PKVM_ID_HYP:
+		ret = hyp_ack_unshare(completer_addr, tx);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int __do_unshare(struct pkvm_mem_share *share)
+{
+	const struct pkvm_mem_transition *tx = &share->tx;
+	u64 completer_addr;
+	int ret;
+
+	switch (tx->initiator.id) {
+	case PKVM_ID_HOST:
+		ret = host_initiate_unshare(&completer_addr, tx);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		return ret;
+
+	switch (tx->completer.id) {
+	case PKVM_ID_HYP:
+		ret = hyp_complete_unshare(completer_addr, tx);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+/*
+ * do_unshare():
+ *
+ * The page owner revokes access from another component for a range of
+ * pages which were previously shared using do_share().
+ *
+ * Initiator: SHARED_OWNED	=> OWNED
+ * Completer: SHARED_BORROWED	=> NOPAGE
+ */
+static int do_unshare(struct pkvm_mem_share *share)
+{
+	int ret;
+
+	ret = check_unshare(share);
+	if (ret)
+		return ret;
+
+	return WARN_ON(__do_unshare(share));
+}
+
+int __pkvm_host_share_hyp(u64 pfn)
+{
+	int ret;
+	u64 host_addr = hyp_pfn_to_phys(pfn);
+	u64 hyp_addr = (u64)__hyp_va(host_addr);
+	struct pkvm_mem_share share = {
+		.tx	= {
+			.nr_pages	= 1,
+			.initiator	= {
+				.id	= PKVM_ID_HOST,
+				.addr	= host_addr,
+				.host	= {
+					.completer_addr = hyp_addr,
+				},
+			},
+			.completer	= {
+				.id	= PKVM_ID_HYP,
+			},
+		},
+		.completer_prot	= PAGE_HYP,
+	};
+
+	host_lock_component();
+	hyp_lock_component();
+
+	ret = do_share(&share);
+
+	hyp_unlock_component();
+	host_unlock_component();
+
+	return ret;
+}
+
+int __pkvm_host_unshare_hyp(u64 pfn)
+{
+	int ret;
+	u64 host_addr = hyp_pfn_to_phys(pfn);
+	u64 hyp_addr = (u64)__hyp_va(host_addr);
+	struct pkvm_mem_share share = {
+		.tx	= {
+			.nr_pages	= 1,
+			.initiator	= {
+				.id	= PKVM_ID_HOST,
+				.addr	= host_addr,
+				.host	= {
+					.completer_addr = hyp_addr,
+				},
+			},
+			.completer	= {
+				.id	= PKVM_ID_HYP,
+			},
+		},
+		.completer_prot	= PAGE_HYP,
+	};
+
+	host_lock_component();
+	hyp_lock_component();
+
+	ret = do_unshare(&share);
+
+	hyp_unlock_component();
+	host_unlock_component();
+
+	return ret;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
new file mode 100644
index 000000000..96193cb31
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/mm.c
@@ -0,0 +1,215 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/kvm_pkvm.h>
+#include <asm/spectre.h>
+
+#include <nvhe/early_alloc.h>
+#include <nvhe/gfp.h>
+#include <nvhe/memory.h>
+#include <nvhe/mm.h>
+#include <nvhe/spinlock.h>
+
+struct kvm_pgtable pkvm_pgtable;
+hyp_spinlock_t pkvm_pgd_lock;
+
+struct memblock_region hyp_memory[HYP_MEMBLOCK_REGIONS];
+unsigned int hyp_memblock_nr;
+
+static u64 __io_map_base;
+
+static int __pkvm_create_mappings(unsigned long start, unsigned long size,
+				  unsigned long phys, enum kvm_pgtable_prot prot)
+{
+	int err;
+
+	hyp_spin_lock(&pkvm_pgd_lock);
+	err = kvm_pgtable_hyp_map(&pkvm_pgtable, start, size, phys, prot);
+	hyp_spin_unlock(&pkvm_pgd_lock);
+
+	return err;
+}
+
+/**
+ * pkvm_alloc_private_va_range - Allocates a private VA range.
+ * @size:	The size of the VA range to reserve.
+ * @haddr:	The hypervisor virtual start address of the allocation.
+ *
+ * The private virtual address (VA) range is allocated above __io_map_base
+ * and aligned based on the order of @size.
+ *
+ * Return: 0 on success or negative error code on failure.
+ */
+int pkvm_alloc_private_va_range(size_t size, unsigned long *haddr)
+{
+	unsigned long base, addr;
+	int ret = 0;
+
+	hyp_spin_lock(&pkvm_pgd_lock);
+
+	/* Align the allocation based on the order of its size */
+	addr = ALIGN(__io_map_base, PAGE_SIZE << get_order(size));
+
+	/* The allocated size is always a multiple of PAGE_SIZE */
+	base = addr + PAGE_ALIGN(size);
+
+	/* Are we overflowing on the vmemmap ? */
+	if (!addr || base > __hyp_vmemmap)
+		ret = -ENOMEM;
+	else {
+		__io_map_base = base;
+		*haddr = addr;
+	}
+
+	hyp_spin_unlock(&pkvm_pgd_lock);
+
+	return ret;
+}
+
+int __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
+				  enum kvm_pgtable_prot prot,
+				  unsigned long *haddr)
+{
+	unsigned long addr;
+	int err;
+
+	size = PAGE_ALIGN(size + offset_in_page(phys));
+	err = pkvm_alloc_private_va_range(size, &addr);
+	if (err)
+		return err;
+
+	err = __pkvm_create_mappings(addr, size, phys, prot);
+	if (err)
+		return err;
+
+	*haddr = addr + offset_in_page(phys);
+	return err;
+}
+
+int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot)
+{
+	unsigned long start = (unsigned long)from;
+	unsigned long end = (unsigned long)to;
+	unsigned long virt_addr;
+	phys_addr_t phys;
+
+	hyp_assert_lock_held(&pkvm_pgd_lock);
+
+	start = start & PAGE_MASK;
+	end = PAGE_ALIGN(end);
+
+	for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) {
+		int err;
+
+		phys = hyp_virt_to_phys((void *)virt_addr);
+		err = kvm_pgtable_hyp_map(&pkvm_pgtable, virt_addr, PAGE_SIZE,
+					  phys, prot);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot)
+{
+	int ret;
+
+	hyp_spin_lock(&pkvm_pgd_lock);
+	ret = pkvm_create_mappings_locked(from, to, prot);
+	hyp_spin_unlock(&pkvm_pgd_lock);
+
+	return ret;
+}
+
+int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back)
+{
+	unsigned long start, end;
+
+	hyp_vmemmap_range(phys, size, &start, &end);
+
+	return __pkvm_create_mappings(start, end - start, back, PAGE_HYP);
+}
+
+static void *__hyp_bp_vect_base;
+int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot)
+{
+	void *vector;
+
+	switch (slot) {
+	case HYP_VECTOR_DIRECT: {
+		vector = __kvm_hyp_vector;
+		break;
+	}
+	case HYP_VECTOR_SPECTRE_DIRECT: {
+		vector = __bp_harden_hyp_vecs;
+		break;
+	}
+	case HYP_VECTOR_INDIRECT:
+	case HYP_VECTOR_SPECTRE_INDIRECT: {
+		vector = (void *)__hyp_bp_vect_base;
+		break;
+	}
+	default:
+		return -EINVAL;
+	}
+
+	vector = __kvm_vector_slot2addr(vector, slot);
+	*this_cpu_ptr(&kvm_hyp_vector) = (unsigned long)vector;
+
+	return 0;
+}
+
+int hyp_map_vectors(void)
+{
+	phys_addr_t phys;
+	unsigned long bp_base;
+	int ret;
+
+	if (!kvm_system_needs_idmapped_vectors()) {
+		__hyp_bp_vect_base = __bp_harden_hyp_vecs;
+		return 0;
+	}
+
+	phys = __hyp_pa(__bp_harden_hyp_vecs);
+	ret = __pkvm_create_private_mapping(phys, __BP_HARDEN_HYP_VECS_SZ,
+					    PAGE_HYP_EXEC, &bp_base);
+	if (ret)
+		return ret;
+
+	__hyp_bp_vect_base = (void *)bp_base;
+
+	return 0;
+}
+
+int hyp_create_idmap(u32 hyp_va_bits)
+{
+	unsigned long start, end;
+
+	start = hyp_virt_to_phys((void *)__hyp_idmap_text_start);
+	start = ALIGN_DOWN(start, PAGE_SIZE);
+
+	end = hyp_virt_to_phys((void *)__hyp_idmap_text_end);
+	end = ALIGN(end, PAGE_SIZE);
+
+	/*
+	 * One half of the VA space is reserved to linearly map portions of
+	 * memory -- see va_layout.c for more details. The other half of the VA
+	 * space contains the trampoline page, and needs some care. Split that
+	 * second half in two and find the quarter of VA space not conflicting
+	 * with the idmap to place the IOs and the vmemmap. IOs use the lower
+	 * half of the quarter and the vmemmap the upper half.
+	 */
+	__io_map_base = start & BIT(hyp_va_bits - 2);
+	__io_map_base ^= BIT(hyp_va_bits - 2);
+	__hyp_vmemmap = __io_map_base | BIT(hyp_va_bits - 3);
+
+	return __pkvm_create_mappings(start, end - start, start, PAGE_HYP_EXEC);
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
new file mode 100644
index 000000000..d40f0b30b
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <asm/kvm_hyp.h>
+#include <nvhe/gfp.h>
+
+u64 __hyp_vmemmap;
+
+/*
+ * Index the hyp_vmemmap to find a potential buddy page, but make no assumption
+ * about its current state.
+ *
+ * Example buddy-tree for a 4-pages physically contiguous pool:
+ *
+ *                 o : Page 3
+ *                /
+ *               o-o : Page 2
+ *              /
+ *             /   o : Page 1
+ *            /   /
+ *           o---o-o : Page 0
+ *    Order  2   1 0
+ *
+ * Example of requests on this pool:
+ *   __find_buddy_nocheck(pool, page 0, order 0) => page 1
+ *   __find_buddy_nocheck(pool, page 0, order 1) => page 2
+ *   __find_buddy_nocheck(pool, page 1, order 0) => page 0
+ *   __find_buddy_nocheck(pool, page 2, order 0) => page 3
+ */
+static struct hyp_page *__find_buddy_nocheck(struct hyp_pool *pool,
+					     struct hyp_page *p,
+					     unsigned short order)
+{
+	phys_addr_t addr = hyp_page_to_phys(p);
+
+	addr ^= (PAGE_SIZE << order);
+
+	/*
+	 * Don't return a page outside the pool range -- it belongs to
+	 * something else and may not be mapped in hyp_vmemmap.
+	 */
+	if (addr < pool->range_start || addr >= pool->range_end)
+		return NULL;
+
+	return hyp_phys_to_page(addr);
+}
+
+/* Find a buddy page currently available for allocation */
+static struct hyp_page *__find_buddy_avail(struct hyp_pool *pool,
+					   struct hyp_page *p,
+					   unsigned short order)
+{
+	struct hyp_page *buddy = __find_buddy_nocheck(pool, p, order);
+
+	if (!buddy || buddy->order != order || buddy->refcount)
+		return NULL;
+
+	return buddy;
+
+}
+
+/*
+ * Pages that are available for allocation are tracked in free-lists, so we use
+ * the pages themselves to store the list nodes to avoid wasting space. As the
+ * allocator always returns zeroed pages (which are zeroed on the hyp_put_page()
+ * path to optimize allocation speed), we also need to clean-up the list node in
+ * each page when we take it out of the list.
+ */
+static inline void page_remove_from_list(struct hyp_page *p)
+{
+	struct list_head *node = hyp_page_to_virt(p);
+
+	__list_del_entry(node);
+	memset(node, 0, sizeof(*node));
+}
+
+static inline void page_add_to_list(struct hyp_page *p, struct list_head *head)
+{
+	struct list_head *node = hyp_page_to_virt(p);
+
+	INIT_LIST_HEAD(node);
+	list_add_tail(node, head);
+}
+
+static inline struct hyp_page *node_to_page(struct list_head *node)
+{
+	return hyp_virt_to_page(node);
+}
+
+static void __hyp_attach_page(struct hyp_pool *pool,
+			      struct hyp_page *p)
+{
+	unsigned short order = p->order;
+	struct hyp_page *buddy;
+
+	memset(hyp_page_to_virt(p), 0, PAGE_SIZE << p->order);
+
+	/*
+	 * Only the first struct hyp_page of a high-order page (otherwise known
+	 * as the 'head') should have p->order set. The non-head pages should
+	 * have p->order = HYP_NO_ORDER. Here @p may no longer be the head
+	 * after coalescing, so make sure to mark it HYP_NO_ORDER proactively.
+	 */
+	p->order = HYP_NO_ORDER;
+	for (; (order + 1) < pool->max_order; order++) {
+		buddy = __find_buddy_avail(pool, p, order);
+		if (!buddy)
+			break;
+
+		/* Take the buddy out of its list, and coalesce with @p */
+		page_remove_from_list(buddy);
+		buddy->order = HYP_NO_ORDER;
+		p = min(p, buddy);
+	}
+
+	/* Mark the new head, and insert it */
+	p->order = order;
+	page_add_to_list(p, &pool->free_area[order]);
+}
+
+static struct hyp_page *__hyp_extract_page(struct hyp_pool *pool,
+					   struct hyp_page *p,
+					   unsigned short order)
+{
+	struct hyp_page *buddy;
+
+	page_remove_from_list(p);
+	while (p->order > order) {
+		/*
+		 * The buddy of order n - 1 currently has HYP_NO_ORDER as it
+		 * is covered by a higher-level page (whose head is @p). Use
+		 * __find_buddy_nocheck() to find it and inject it in the
+		 * free_list[n - 1], effectively splitting @p in half.
+		 */
+		p->order--;
+		buddy = __find_buddy_nocheck(pool, p, p->order);
+		buddy->order = p->order;
+		page_add_to_list(buddy, &pool->free_area[buddy->order]);
+	}
+
+	return p;
+}
+
+static inline void hyp_page_ref_inc(struct hyp_page *p)
+{
+	BUG_ON(p->refcount == USHRT_MAX);
+	p->refcount++;
+}
+
+static inline int hyp_page_ref_dec_and_test(struct hyp_page *p)
+{
+	BUG_ON(!p->refcount);
+	p->refcount--;
+	return (p->refcount == 0);
+}
+
+static inline void hyp_set_page_refcounted(struct hyp_page *p)
+{
+	BUG_ON(p->refcount);
+	p->refcount = 1;
+}
+
+static void __hyp_put_page(struct hyp_pool *pool, struct hyp_page *p)
+{
+	if (hyp_page_ref_dec_and_test(p))
+		__hyp_attach_page(pool, p);
+}
+
+/*
+ * Changes to the buddy tree and page refcounts must be done with the hyp_pool
+ * lock held. If a refcount change requires an update to the buddy tree (e.g.
+ * hyp_put_page()), both operations must be done within the same critical
+ * section to guarantee transient states (e.g. a page with null refcount but
+ * not yet attached to a free list) can't be observed by well-behaved readers.
+ */
+void hyp_put_page(struct hyp_pool *pool, void *addr)
+{
+	struct hyp_page *p = hyp_virt_to_page(addr);
+
+	hyp_spin_lock(&pool->lock);
+	__hyp_put_page(pool, p);
+	hyp_spin_unlock(&pool->lock);
+}
+
+void hyp_get_page(struct hyp_pool *pool, void *addr)
+{
+	struct hyp_page *p = hyp_virt_to_page(addr);
+
+	hyp_spin_lock(&pool->lock);
+	hyp_page_ref_inc(p);
+	hyp_spin_unlock(&pool->lock);
+}
+
+void hyp_split_page(struct hyp_page *p)
+{
+	unsigned short order = p->order;
+	unsigned int i;
+
+	p->order = 0;
+	for (i = 1; i < (1 << order); i++) {
+		struct hyp_page *tail = p + i;
+
+		tail->order = 0;
+		hyp_set_page_refcounted(tail);
+	}
+}
+
+void *hyp_alloc_pages(struct hyp_pool *pool, unsigned short order)
+{
+	unsigned short i = order;
+	struct hyp_page *p;
+
+	hyp_spin_lock(&pool->lock);
+
+	/* Look for a high-enough-order page */
+	while (i < pool->max_order && list_empty(&pool->free_area[i]))
+		i++;
+	if (i >= pool->max_order) {
+		hyp_spin_unlock(&pool->lock);
+		return NULL;
+	}
+
+	/* Extract it from the tree at the right order */
+	p = node_to_page(pool->free_area[i].next);
+	p = __hyp_extract_page(pool, p, order);
+
+	hyp_set_page_refcounted(p);
+	hyp_spin_unlock(&pool->lock);
+
+	return hyp_page_to_virt(p);
+}
+
+int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
+		  unsigned int reserved_pages)
+{
+	phys_addr_t phys = hyp_pfn_to_phys(pfn);
+	struct hyp_page *p;
+	int i;
+
+	hyp_spin_lock_init(&pool->lock);
+	pool->max_order = min(MAX_ORDER, get_order((nr_pages + 1) << PAGE_SHIFT));
+	for (i = 0; i < pool->max_order; i++)
+		INIT_LIST_HEAD(&pool->free_area[i]);
+	pool->range_start = phys;
+	pool->range_end = phys + (nr_pages << PAGE_SHIFT);
+
+	/* Init the vmemmap portion */
+	p = hyp_phys_to_page(phys);
+	for (i = 0; i < nr_pages; i++) {
+		p[i].order = 0;
+		hyp_set_page_refcounted(&p[i]);
+	}
+
+	/* Attach the unused pages to the buddy tree */
+	for (i = reserved_pages; i < nr_pages; i++)
+		__hyp_put_page(pool, &p[i]);
+
+	return 0;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c
new file mode 100644
index 000000000..85d3b7ae7
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 Google LLC
+ * Author: Fuad Tabba <tabba@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/mm.h>
+#include <nvhe/fixed_config.h>
+#include <nvhe/trap_handler.h>
+
+/*
+ * Set trap register values based on features in ID_AA64PFR0.
+ */
+static void pvm_init_traps_aa64pfr0(struct kvm_vcpu *vcpu)
+{
+	const u64 feature_ids = pvm_read_id_reg(vcpu, SYS_ID_AA64PFR0_EL1);
+	u64 hcr_set = HCR_RW;
+	u64 hcr_clear = 0;
+	u64 cptr_set = 0;
+
+	/* Protected KVM does not support AArch32 guests. */
+	BUILD_BUG_ON(FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL0),
+		PVM_ID_AA64PFR0_RESTRICT_UNSIGNED) != ID_AA64PFR0_EL1_ELx_64BIT_ONLY);
+	BUILD_BUG_ON(FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL1),
+		PVM_ID_AA64PFR0_RESTRICT_UNSIGNED) != ID_AA64PFR0_EL1_ELx_64BIT_ONLY);
+
+	/*
+	 * Linux guests assume support for floating-point and Advanced SIMD. Do
+	 * not change the trapping behavior for these from the KVM default.
+	 */
+	BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_FP),
+				PVM_ID_AA64PFR0_ALLOW));
+	BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_AdvSIMD),
+				PVM_ID_AA64PFR0_ALLOW));
+
+	/* Trap RAS unless all current versions are supported */
+	if (FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_RAS), feature_ids) <
+	    ID_AA64PFR0_EL1_RAS_V1P1) {
+		hcr_set |= HCR_TERR | HCR_TEA;
+		hcr_clear |= HCR_FIEN;
+	}
+
+	/* Trap AMU */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_AMU), feature_ids)) {
+		hcr_clear |= HCR_AMVOFFEN;
+		cptr_set |= CPTR_EL2_TAM;
+	}
+
+	/* Trap SVE */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_SVE), feature_ids))
+		cptr_set |= CPTR_EL2_TZ;
+
+	vcpu->arch.hcr_el2 |= hcr_set;
+	vcpu->arch.hcr_el2 &= ~hcr_clear;
+	vcpu->arch.cptr_el2 |= cptr_set;
+}
+
+/*
+ * Set trap register values based on features in ID_AA64PFR1.
+ */
+static void pvm_init_traps_aa64pfr1(struct kvm_vcpu *vcpu)
+{
+	const u64 feature_ids = pvm_read_id_reg(vcpu, SYS_ID_AA64PFR1_EL1);
+	u64 hcr_set = 0;
+	u64 hcr_clear = 0;
+
+	/* Memory Tagging: Trap and Treat as Untagged if not supported. */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE), feature_ids)) {
+		hcr_set |= HCR_TID5;
+		hcr_clear |= HCR_DCT | HCR_ATA;
+	}
+
+	vcpu->arch.hcr_el2 |= hcr_set;
+	vcpu->arch.hcr_el2 &= ~hcr_clear;
+}
+
+/*
+ * Set trap register values based on features in ID_AA64DFR0.
+ */
+static void pvm_init_traps_aa64dfr0(struct kvm_vcpu *vcpu)
+{
+	const u64 feature_ids = pvm_read_id_reg(vcpu, SYS_ID_AA64DFR0_EL1);
+	u64 mdcr_set = 0;
+	u64 mdcr_clear = 0;
+	u64 cptr_set = 0;
+
+	/* Trap/constrain PMU */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer), feature_ids)) {
+		mdcr_set |= MDCR_EL2_TPM | MDCR_EL2_TPMCR;
+		mdcr_clear |= MDCR_EL2_HPME | MDCR_EL2_MTPME |
+			      MDCR_EL2_HPMN_MASK;
+	}
+
+	/* Trap Debug */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DebugVer), feature_ids))
+		mdcr_set |= MDCR_EL2_TDRA | MDCR_EL2_TDA | MDCR_EL2_TDE;
+
+	/* Trap OS Double Lock */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DoubleLock), feature_ids))
+		mdcr_set |= MDCR_EL2_TDOSA;
+
+	/* Trap SPE */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMSVer), feature_ids)) {
+		mdcr_set |= MDCR_EL2_TPMS;
+		mdcr_clear |= MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT;
+	}
+
+	/* Trap Trace Filter */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_TraceFilt), feature_ids))
+		mdcr_set |= MDCR_EL2_TTRF;
+
+	/* Trap Trace */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_TraceVer), feature_ids))
+		cptr_set |= CPTR_EL2_TTA;
+
+	vcpu->arch.mdcr_el2 |= mdcr_set;
+	vcpu->arch.mdcr_el2 &= ~mdcr_clear;
+	vcpu->arch.cptr_el2 |= cptr_set;
+}
+
+/*
+ * Set trap register values based on features in ID_AA64MMFR0.
+ */
+static void pvm_init_traps_aa64mmfr0(struct kvm_vcpu *vcpu)
+{
+	const u64 feature_ids = pvm_read_id_reg(vcpu, SYS_ID_AA64MMFR0_EL1);
+	u64 mdcr_set = 0;
+
+	/* Trap Debug Communications Channel registers */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_FGT), feature_ids))
+		mdcr_set |= MDCR_EL2_TDCC;
+
+	vcpu->arch.mdcr_el2 |= mdcr_set;
+}
+
+/*
+ * Set trap register values based on features in ID_AA64MMFR1.
+ */
+static void pvm_init_traps_aa64mmfr1(struct kvm_vcpu *vcpu)
+{
+	const u64 feature_ids = pvm_read_id_reg(vcpu, SYS_ID_AA64MMFR1_EL1);
+	u64 hcr_set = 0;
+
+	/* Trap LOR */
+	if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_LO), feature_ids))
+		hcr_set |= HCR_TLOR;
+
+	vcpu->arch.hcr_el2 |= hcr_set;
+}
+
+/*
+ * Set baseline trap register values.
+ */
+static void pvm_init_trap_regs(struct kvm_vcpu *vcpu)
+{
+	const u64 hcr_trap_feat_regs = HCR_TID3;
+	const u64 hcr_trap_impdef = HCR_TACR | HCR_TIDCP | HCR_TID1;
+
+	/*
+	 * Always trap:
+	 * - Feature id registers: to control features exposed to guests
+	 * - Implementation-defined features
+	 */
+	vcpu->arch.hcr_el2 |= hcr_trap_feat_regs | hcr_trap_impdef;
+
+	/* Clear res0 and set res1 bits to trap potential new features. */
+	vcpu->arch.hcr_el2 &= ~(HCR_RES0);
+	vcpu->arch.mdcr_el2 &= ~(MDCR_EL2_RES0);
+	vcpu->arch.cptr_el2 |= CPTR_NVHE_EL2_RES1;
+	vcpu->arch.cptr_el2 &= ~(CPTR_NVHE_EL2_RES0);
+}
+
+/*
+ * Initialize trap register values for protected VMs.
+ */
+void __pkvm_vcpu_init_traps(struct kvm_vcpu *vcpu)
+{
+	pvm_init_trap_regs(vcpu);
+	pvm_init_traps_aa64pfr0(vcpu);
+	pvm_init_traps_aa64pfr1(vcpu);
+	pvm_init_traps_aa64dfr0(vcpu);
+	pvm_init_traps_aa64mmfr0(vcpu);
+	pvm_init_traps_aa64mmfr1(vcpu);
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
new file mode 100644
index 000000000..08508783e
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: David Brazdil <dbrazdil@google.com>
+ */
+
+#include <asm/kvm_asm.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+#include <uapi/linux/psci.h>
+
+#include <nvhe/memory.h>
+#include <nvhe/trap_handler.h>
+
+void kvm_hyp_cpu_entry(unsigned long r0);
+void kvm_hyp_cpu_resume(unsigned long r0);
+
+void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
+
+/* Config options set by the host. */
+struct kvm_host_psci_config __ro_after_init kvm_host_psci_config;
+
+#define INVALID_CPU_ID	UINT_MAX
+
+struct psci_boot_args {
+	atomic_t lock;
+	unsigned long pc;
+	unsigned long r0;
+};
+
+#define PSCI_BOOT_ARGS_UNLOCKED		0
+#define PSCI_BOOT_ARGS_LOCKED		1
+
+#define PSCI_BOOT_ARGS_INIT					\
+	((struct psci_boot_args){				\
+		.lock = ATOMIC_INIT(PSCI_BOOT_ARGS_UNLOCKED),	\
+	})
+
+static DEFINE_PER_CPU(struct psci_boot_args, cpu_on_args) = PSCI_BOOT_ARGS_INIT;
+static DEFINE_PER_CPU(struct psci_boot_args, suspend_args) = PSCI_BOOT_ARGS_INIT;
+
+#define	is_psci_0_1(what, func_id)					\
+	(kvm_host_psci_config.psci_0_1_ ## what ## _implemented &&	\
+	 (func_id) == kvm_host_psci_config.function_ids_0_1.what)
+
+static bool is_psci_0_1_call(u64 func_id)
+{
+	return (is_psci_0_1(cpu_suspend, func_id) ||
+		is_psci_0_1(cpu_on, func_id) ||
+		is_psci_0_1(cpu_off, func_id) ||
+		is_psci_0_1(migrate, func_id));
+}
+
+static bool is_psci_0_2_call(u64 func_id)
+{
+	/* SMCCC reserves IDs 0x00-1F with the given 32/64-bit base for PSCI. */
+	return (PSCI_0_2_FN(0) <= func_id && func_id <= PSCI_0_2_FN(31)) ||
+	       (PSCI_0_2_FN64(0) <= func_id && func_id <= PSCI_0_2_FN64(31));
+}
+
+static unsigned long psci_call(unsigned long fn, unsigned long arg0,
+			       unsigned long arg1, unsigned long arg2)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_smc(fn, arg0, arg1, arg2, &res);
+	return res.a0;
+}
+
+static unsigned long psci_forward(struct kvm_cpu_context *host_ctxt)
+{
+	return psci_call(cpu_reg(host_ctxt, 0), cpu_reg(host_ctxt, 1),
+			 cpu_reg(host_ctxt, 2), cpu_reg(host_ctxt, 3));
+}
+
+static unsigned int find_cpu_id(u64 mpidr)
+{
+	unsigned int i;
+
+	/* Reject invalid MPIDRs */
+	if (mpidr & ~MPIDR_HWID_BITMASK)
+		return INVALID_CPU_ID;
+
+	for (i = 0; i < NR_CPUS; i++) {
+		if (cpu_logical_map(i) == mpidr)
+			return i;
+	}
+
+	return INVALID_CPU_ID;
+}
+
+static __always_inline bool try_acquire_boot_args(struct psci_boot_args *args)
+{
+	return atomic_cmpxchg_acquire(&args->lock,
+				      PSCI_BOOT_ARGS_UNLOCKED,
+				      PSCI_BOOT_ARGS_LOCKED) ==
+		PSCI_BOOT_ARGS_UNLOCKED;
+}
+
+static __always_inline void release_boot_args(struct psci_boot_args *args)
+{
+	atomic_set_release(&args->lock, PSCI_BOOT_ARGS_UNLOCKED);
+}
+
+static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(u64, mpidr, host_ctxt, 1);
+	DECLARE_REG(unsigned long, pc, host_ctxt, 2);
+	DECLARE_REG(unsigned long, r0, host_ctxt, 3);
+
+	unsigned int cpu_id;
+	struct psci_boot_args *boot_args;
+	struct kvm_nvhe_init_params *init_params;
+	int ret;
+
+	/*
+	 * Find the logical CPU ID for the given MPIDR. The search set is
+	 * the set of CPUs that were online at the point of KVM initialization.
+	 * Booting other CPUs is rejected because their cpufeatures were not
+	 * checked against the finalized capabilities. This could be relaxed
+	 * by doing the feature checks in hyp.
+	 */
+	cpu_id = find_cpu_id(mpidr);
+	if (cpu_id == INVALID_CPU_ID)
+		return PSCI_RET_INVALID_PARAMS;
+
+	boot_args = per_cpu_ptr(&cpu_on_args, cpu_id);
+	init_params = per_cpu_ptr(&kvm_init_params, cpu_id);
+
+	/* Check if the target CPU is already being booted. */
+	if (!try_acquire_boot_args(boot_args))
+		return PSCI_RET_ALREADY_ON;
+
+	boot_args->pc = pc;
+	boot_args->r0 = r0;
+	wmb();
+
+	ret = psci_call(func_id, mpidr,
+			__hyp_pa(&kvm_hyp_cpu_entry),
+			__hyp_pa(init_params));
+
+	/* If successful, the lock will be released by the target CPU. */
+	if (ret != PSCI_RET_SUCCESS)
+		release_boot_args(boot_args);
+
+	return ret;
+}
+
+static int psci_cpu_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(u64, power_state, host_ctxt, 1);
+	DECLARE_REG(unsigned long, pc, host_ctxt, 2);
+	DECLARE_REG(unsigned long, r0, host_ctxt, 3);
+
+	struct psci_boot_args *boot_args;
+	struct kvm_nvhe_init_params *init_params;
+
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
+
+	/*
+	 * No need to acquire a lock before writing to boot_args because a core
+	 * can only suspend itself. Racy CPU_ON calls use a separate struct.
+	 */
+	boot_args->pc = pc;
+	boot_args->r0 = r0;
+
+	/*
+	 * Will either return if shallow sleep state, or wake up into the entry
+	 * point if it is a deep sleep state.
+	 */
+	return psci_call(func_id, power_state,
+			 __hyp_pa(&kvm_hyp_cpu_resume),
+			 __hyp_pa(init_params));
+}
+
+static int psci_system_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(unsigned long, pc, host_ctxt, 1);
+	DECLARE_REG(unsigned long, r0, host_ctxt, 2);
+
+	struct psci_boot_args *boot_args;
+	struct kvm_nvhe_init_params *init_params;
+
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
+
+	/*
+	 * No need to acquire a lock before writing to boot_args because a core
+	 * can only suspend itself. Racy CPU_ON calls use a separate struct.
+	 */
+	boot_args->pc = pc;
+	boot_args->r0 = r0;
+
+	/* Will only return on error. */
+	return psci_call(func_id,
+			 __hyp_pa(&kvm_hyp_cpu_resume),
+			 __hyp_pa(init_params), 0);
+}
+
+asmlinkage void __noreturn kvm_host_psci_cpu_entry(bool is_cpu_on)
+{
+	struct psci_boot_args *boot_args;
+	struct kvm_cpu_context *host_ctxt;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+
+	if (is_cpu_on)
+		boot_args = this_cpu_ptr(&cpu_on_args);
+	else
+		boot_args = this_cpu_ptr(&suspend_args);
+
+	cpu_reg(host_ctxt, 0) = boot_args->r0;
+	write_sysreg_el2(boot_args->pc, SYS_ELR);
+
+	if (is_cpu_on)
+		release_boot_args(boot_args);
+
+	__host_enter(host_ctxt);
+}
+
+static unsigned long psci_0_1_handler(u64 func_id, struct kvm_cpu_context *host_ctxt)
+{
+	if (is_psci_0_1(cpu_off, func_id) || is_psci_0_1(migrate, func_id))
+		return psci_forward(host_ctxt);
+	if (is_psci_0_1(cpu_on, func_id))
+		return psci_cpu_on(func_id, host_ctxt);
+	if (is_psci_0_1(cpu_suspend, func_id))
+		return psci_cpu_suspend(func_id, host_ctxt);
+
+	return PSCI_RET_NOT_SUPPORTED;
+}
+
+static unsigned long psci_0_2_handler(u64 func_id, struct kvm_cpu_context *host_ctxt)
+{
+	switch (func_id) {
+	case PSCI_0_2_FN_PSCI_VERSION:
+	case PSCI_0_2_FN_CPU_OFF:
+	case PSCI_0_2_FN64_AFFINITY_INFO:
+	case PSCI_0_2_FN64_MIGRATE:
+	case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+	case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
+		return psci_forward(host_ctxt);
+	/*
+	 * SYSTEM_OFF/RESET should not return according to the spec.
+	 * Allow it so as to stay robust to broken firmware.
+	 */
+	case PSCI_0_2_FN_SYSTEM_OFF:
+	case PSCI_0_2_FN_SYSTEM_RESET:
+		return psci_forward(host_ctxt);
+	case PSCI_0_2_FN64_CPU_SUSPEND:
+		return psci_cpu_suspend(func_id, host_ctxt);
+	case PSCI_0_2_FN64_CPU_ON:
+		return psci_cpu_on(func_id, host_ctxt);
+	default:
+		return PSCI_RET_NOT_SUPPORTED;
+	}
+}
+
+static unsigned long psci_1_0_handler(u64 func_id, struct kvm_cpu_context *host_ctxt)
+{
+	switch (func_id) {
+	case PSCI_1_0_FN_PSCI_FEATURES:
+	case PSCI_1_0_FN_SET_SUSPEND_MODE:
+	case PSCI_1_1_FN64_SYSTEM_RESET2:
+		return psci_forward(host_ctxt);
+	case PSCI_1_0_FN64_SYSTEM_SUSPEND:
+		return psci_system_suspend(func_id, host_ctxt);
+	default:
+		return psci_0_2_handler(func_id, host_ctxt);
+	}
+}
+
+bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt)
+{
+	DECLARE_REG(u64, func_id, host_ctxt, 0);
+	unsigned long ret;
+
+	switch (kvm_host_psci_config.version) {
+	case PSCI_VERSION(0, 1):
+		if (!is_psci_0_1_call(func_id))
+			return false;
+		ret = psci_0_1_handler(func_id, host_ctxt);
+		break;
+	case PSCI_VERSION(0, 2):
+		if (!is_psci_0_2_call(func_id))
+			return false;
+		ret = psci_0_2_handler(func_id, host_ctxt);
+		break;
+	default:
+		if (!is_psci_0_2_call(func_id))
+			return false;
+		ret = psci_1_0_handler(func_id, host_ctxt);
+		break;
+	}
+
+	cpu_reg(host_ctxt, 0) = ret;
+	cpu_reg(host_ctxt, 1) = 0;
+	cpu_reg(host_ctxt, 2) = 0;
+	cpu_reg(host_ctxt, 3) = 0;
+	return true;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c
new file mode 100644
index 000000000..e8d4ea2fc
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/setup.c
@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/kvm_pkvm.h>
+
+#include <nvhe/early_alloc.h>
+#include <nvhe/fixed_config.h>
+#include <nvhe/gfp.h>
+#include <nvhe/memory.h>
+#include <nvhe/mem_protect.h>
+#include <nvhe/mm.h>
+#include <nvhe/trap_handler.h>
+
+unsigned long hyp_nr_cpus;
+
+#define hyp_percpu_size ((unsigned long)__per_cpu_end - \
+			 (unsigned long)__per_cpu_start)
+
+static void *vmemmap_base;
+static void *hyp_pgt_base;
+static void *host_s2_pgt_base;
+static struct kvm_pgtable_mm_ops pkvm_pgtable_mm_ops;
+static struct hyp_pool hpool;
+
+static int divide_memory_pool(void *virt, unsigned long size)
+{
+	unsigned long vstart, vend, nr_pages;
+
+	hyp_early_alloc_init(virt, size);
+
+	hyp_vmemmap_range(__hyp_pa(virt), size, &vstart, &vend);
+	nr_pages = (vend - vstart) >> PAGE_SHIFT;
+	vmemmap_base = hyp_early_alloc_contig(nr_pages);
+	if (!vmemmap_base)
+		return -ENOMEM;
+
+	nr_pages = hyp_s1_pgtable_pages();
+	hyp_pgt_base = hyp_early_alloc_contig(nr_pages);
+	if (!hyp_pgt_base)
+		return -ENOMEM;
+
+	nr_pages = host_s2_pgtable_pages();
+	host_s2_pgt_base = hyp_early_alloc_contig(nr_pages);
+	if (!host_s2_pgt_base)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int recreate_hyp_mappings(phys_addr_t phys, unsigned long size,
+				 unsigned long *per_cpu_base,
+				 u32 hyp_va_bits)
+{
+	void *start, *end, *virt = hyp_phys_to_virt(phys);
+	unsigned long pgt_size = hyp_s1_pgtable_pages() << PAGE_SHIFT;
+	enum kvm_pgtable_prot prot;
+	int ret, i;
+
+	/* Recreate the hyp page-table using the early page allocator */
+	hyp_early_alloc_init(hyp_pgt_base, pgt_size);
+	ret = kvm_pgtable_hyp_init(&pkvm_pgtable, hyp_va_bits,
+				   &hyp_early_alloc_mm_ops);
+	if (ret)
+		return ret;
+
+	ret = hyp_create_idmap(hyp_va_bits);
+	if (ret)
+		return ret;
+
+	ret = hyp_map_vectors();
+	if (ret)
+		return ret;
+
+	ret = hyp_back_vmemmap(phys, size, hyp_virt_to_phys(vmemmap_base));
+	if (ret)
+		return ret;
+
+	ret = pkvm_create_mappings(__hyp_text_start, __hyp_text_end, PAGE_HYP_EXEC);
+	if (ret)
+		return ret;
+
+	ret = pkvm_create_mappings(__hyp_rodata_start, __hyp_rodata_end, PAGE_HYP_RO);
+	if (ret)
+		return ret;
+
+	ret = pkvm_create_mappings(__hyp_bss_start, __hyp_bss_end, PAGE_HYP);
+	if (ret)
+		return ret;
+
+	ret = pkvm_create_mappings(virt, virt + size, PAGE_HYP);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < hyp_nr_cpus; i++) {
+		struct kvm_nvhe_init_params *params = per_cpu_ptr(&kvm_init_params, i);
+		unsigned long hyp_addr;
+
+		start = (void *)kern_hyp_va(per_cpu_base[i]);
+		end = start + PAGE_ALIGN(hyp_percpu_size);
+		ret = pkvm_create_mappings(start, end, PAGE_HYP);
+		if (ret)
+			return ret;
+
+		/*
+		 * Allocate a contiguous HYP private VA range for the stack
+		 * and guard page. The allocation is also aligned based on
+		 * the order of its size.
+		 */
+		ret = pkvm_alloc_private_va_range(PAGE_SIZE * 2, &hyp_addr);
+		if (ret)
+			return ret;
+
+		/*
+		 * Since the stack grows downwards, map the stack to the page
+		 * at the higher address and leave the lower guard page
+		 * unbacked.
+		 *
+		 * Any valid stack address now has the PAGE_SHIFT bit as 1
+		 * and addresses corresponding to the guard page have the
+		 * PAGE_SHIFT bit as 0 - this is used for overflow detection.
+		 */
+		hyp_spin_lock(&pkvm_pgd_lock);
+		ret = kvm_pgtable_hyp_map(&pkvm_pgtable, hyp_addr + PAGE_SIZE,
+					PAGE_SIZE, params->stack_pa, PAGE_HYP);
+		hyp_spin_unlock(&pkvm_pgd_lock);
+		if (ret)
+			return ret;
+
+		/* Update stack_hyp_va to end of the stack's private VA range */
+		params->stack_hyp_va = hyp_addr + (2 * PAGE_SIZE);
+	}
+
+	/*
+	 * Map the host's .bss and .rodata sections RO in the hypervisor, but
+	 * transfer the ownership from the host to the hypervisor itself to
+	 * make sure it can't be donated or shared with another entity.
+	 *
+	 * The ownership transition requires matching changes in the host
+	 * stage-2. This will be done later (see finalize_host_mappings()) once
+	 * the hyp_vmemmap is addressable.
+	 */
+	prot = pkvm_mkstate(PAGE_HYP_RO, PKVM_PAGE_SHARED_OWNED);
+	ret = pkvm_create_mappings(__start_rodata, __end_rodata, prot);
+	if (ret)
+		return ret;
+
+	ret = pkvm_create_mappings(__hyp_bss_end, __bss_stop, prot);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void update_nvhe_init_params(void)
+{
+	struct kvm_nvhe_init_params *params;
+	unsigned long i;
+
+	for (i = 0; i < hyp_nr_cpus; i++) {
+		params = per_cpu_ptr(&kvm_init_params, i);
+		params->pgd_pa = __hyp_pa(pkvm_pgtable.pgd);
+		dcache_clean_inval_poc((unsigned long)params,
+				    (unsigned long)params + sizeof(*params));
+	}
+}
+
+static void *hyp_zalloc_hyp_page(void *arg)
+{
+	return hyp_alloc_pages(&hpool, 0);
+}
+
+static void hpool_get_page(void *addr)
+{
+	hyp_get_page(&hpool, addr);
+}
+
+static void hpool_put_page(void *addr)
+{
+	hyp_put_page(&hpool, addr);
+}
+
+static int finalize_host_mappings_walker(u64 addr, u64 end, u32 level,
+					 kvm_pte_t *ptep,
+					 enum kvm_pgtable_walk_flags flag,
+					 void * const arg)
+{
+	struct kvm_pgtable_mm_ops *mm_ops = arg;
+	enum kvm_pgtable_prot prot;
+	enum pkvm_page_state state;
+	kvm_pte_t pte = *ptep;
+	phys_addr_t phys;
+
+	if (!kvm_pte_valid(pte))
+		return 0;
+
+	/*
+	 * Fix-up the refcount for the page-table pages as the early allocator
+	 * was unable to access the hyp_vmemmap and so the buddy allocator has
+	 * initialised the refcount to '1'.
+	 */
+	mm_ops->get_page(ptep);
+	if (flag != KVM_PGTABLE_WALK_LEAF)
+		return 0;
+
+	if (level != (KVM_PGTABLE_MAX_LEVELS - 1))
+		return -EINVAL;
+
+	phys = kvm_pte_to_phys(pte);
+	if (!addr_is_memory(phys))
+		return -EINVAL;
+
+	/*
+	 * Adjust the host stage-2 mappings to match the ownership attributes
+	 * configured in the hypervisor stage-1.
+	 */
+	state = pkvm_getstate(kvm_pgtable_hyp_pte_prot(pte));
+	switch (state) {
+	case PKVM_PAGE_OWNED:
+		return host_stage2_set_owner_locked(phys, PAGE_SIZE, pkvm_hyp_id);
+	case PKVM_PAGE_SHARED_OWNED:
+		prot = pkvm_mkstate(PKVM_HOST_MEM_PROT, PKVM_PAGE_SHARED_BORROWED);
+		break;
+	case PKVM_PAGE_SHARED_BORROWED:
+		prot = pkvm_mkstate(PKVM_HOST_MEM_PROT, PKVM_PAGE_SHARED_OWNED);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return host_stage2_idmap_locked(phys, PAGE_SIZE, prot);
+}
+
+static int finalize_host_mappings(void)
+{
+	struct kvm_pgtable_walker walker = {
+		.cb	= finalize_host_mappings_walker,
+		.flags	= KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
+		.arg	= pkvm_pgtable.mm_ops,
+	};
+	int i, ret;
+
+	for (i = 0; i < hyp_memblock_nr; i++) {
+		struct memblock_region *reg = &hyp_memory[i];
+		u64 start = (u64)hyp_phys_to_virt(reg->base);
+
+		ret = kvm_pgtable_walk(&pkvm_pgtable, start, reg->size, &walker);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void __noreturn __pkvm_init_finalise(void)
+{
+	struct kvm_host_data *host_data = this_cpu_ptr(&kvm_host_data);
+	struct kvm_cpu_context *host_ctxt = &host_data->host_ctxt;
+	unsigned long nr_pages, reserved_pages, pfn;
+	int ret;
+
+	/* Now that the vmemmap is backed, install the full-fledged allocator */
+	pfn = hyp_virt_to_pfn(hyp_pgt_base);
+	nr_pages = hyp_s1_pgtable_pages();
+	reserved_pages = hyp_early_alloc_nr_used_pages();
+	ret = hyp_pool_init(&hpool, pfn, nr_pages, reserved_pages);
+	if (ret)
+		goto out;
+
+	ret = kvm_host_prepare_stage2(host_s2_pgt_base);
+	if (ret)
+		goto out;
+
+	pkvm_pgtable_mm_ops = (struct kvm_pgtable_mm_ops) {
+		.zalloc_page = hyp_zalloc_hyp_page,
+		.phys_to_virt = hyp_phys_to_virt,
+		.virt_to_phys = hyp_virt_to_phys,
+		.get_page = hpool_get_page,
+		.put_page = hpool_put_page,
+		.page_count = hyp_page_count,
+	};
+	pkvm_pgtable.mm_ops = &pkvm_pgtable_mm_ops;
+
+	ret = finalize_host_mappings();
+	if (ret)
+		goto out;
+
+out:
+	/*
+	 * We tail-called to here from handle___pkvm_init() and will not return,
+	 * so make sure to propagate the return value to the host.
+	 */
+	cpu_reg(host_ctxt, 1) = ret;
+
+	__host_enter(host_ctxt);
+}
+
+int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpus,
+		unsigned long *per_cpu_base, u32 hyp_va_bits)
+{
+	struct kvm_nvhe_init_params *params;
+	void *virt = hyp_phys_to_virt(phys);
+	void (*fn)(phys_addr_t params_pa, void *finalize_fn_va);
+	int ret;
+
+	BUG_ON(kvm_check_pvm_sysreg_table());
+
+	if (!PAGE_ALIGNED(phys) || !PAGE_ALIGNED(size))
+		return -EINVAL;
+
+	hyp_spin_lock_init(&pkvm_pgd_lock);
+	hyp_nr_cpus = nr_cpus;
+
+	ret = divide_memory_pool(virt, size);
+	if (ret)
+		return ret;
+
+	ret = recreate_hyp_mappings(phys, size, per_cpu_base, hyp_va_bits);
+	if (ret)
+		return ret;
+
+	update_nvhe_init_params();
+
+	/* Jump in the idmap page to switch to the new page-tables */
+	params = this_cpu_ptr(&kvm_init_params);
+	fn = (typeof(fn))__hyp_pa(__pkvm_init_switch_pgd);
+	fn(__hyp_pa(params), __pkvm_init_finalise);
+
+	unreachable();
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/stacktrace.c b/arch/arm64/kvm/hyp/nvhe/stacktrace.c
new file mode 100644
index 000000000..ed6b58b19
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/stacktrace.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * KVM nVHE hypervisor stack tracing support.
+ *
+ * Copyright (C) 2022 Google LLC
+ */
+#include <asm/kvm_asm.h>
+#include <asm/kvm_hyp.h>
+#include <asm/memory.h>
+#include <asm/percpu.h>
+
+DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack)
+	__aligned(16);
+
+DEFINE_PER_CPU(struct kvm_nvhe_stacktrace_info, kvm_stacktrace_info);
+
+/*
+ * hyp_prepare_backtrace - Prepare non-protected nVHE backtrace.
+ *
+ * @fp : frame pointer at which to start the unwinding.
+ * @pc : program counter at which to start the unwinding.
+ *
+ * Save the information needed by the host to unwind the non-protected
+ * nVHE hypervisor stack in EL1.
+ */
+static void hyp_prepare_backtrace(unsigned long fp, unsigned long pc)
+{
+	struct kvm_nvhe_stacktrace_info *stacktrace_info = this_cpu_ptr(&kvm_stacktrace_info);
+	struct kvm_nvhe_init_params *params = this_cpu_ptr(&kvm_init_params);
+
+	stacktrace_info->stack_base = (unsigned long)(params->stack_hyp_va - PAGE_SIZE);
+	stacktrace_info->overflow_stack_base = (unsigned long)this_cpu_ptr(overflow_stack);
+	stacktrace_info->fp = fp;
+	stacktrace_info->pc = pc;
+}
+
+#ifdef CONFIG_PROTECTED_NVHE_STACKTRACE
+#include <asm/stacktrace/nvhe.h>
+
+DEFINE_PER_CPU(unsigned long [NVHE_STACKTRACE_SIZE/sizeof(long)], pkvm_stacktrace);
+
+static struct stack_info stackinfo_get_overflow(void)
+{
+	unsigned long low = (unsigned long)this_cpu_ptr(overflow_stack);
+	unsigned long high = low + OVERFLOW_STACK_SIZE;
+
+	return (struct stack_info) {
+		.low = low,
+		.high = high,
+	};
+}
+
+static struct stack_info stackinfo_get_hyp(void)
+{
+	struct kvm_nvhe_init_params *params = this_cpu_ptr(&kvm_init_params);
+	unsigned long high = params->stack_hyp_va;
+	unsigned long low = high - PAGE_SIZE;
+
+	return (struct stack_info) {
+		.low = low,
+		.high = high,
+	};
+}
+
+static int unwind_next(struct unwind_state *state)
+{
+	return unwind_next_frame_record(state);
+}
+
+static void notrace unwind(struct unwind_state *state,
+			   stack_trace_consume_fn consume_entry,
+			   void *cookie)
+{
+	while (1) {
+		int ret;
+
+		if (!consume_entry(cookie, state->pc))
+			break;
+		ret = unwind_next(state);
+		if (ret < 0)
+			break;
+	}
+}
+
+/*
+ * pkvm_save_backtrace_entry - Saves a protected nVHE HYP stacktrace entry
+ *
+ * @arg    : index of the entry in the stacktrace buffer
+ * @where  : the program counter corresponding to the stack frame
+ *
+ * Save the return address of a stack frame to the shared stacktrace buffer.
+ * The host can access this shared buffer from EL1 to dump the backtrace.
+ */
+static bool pkvm_save_backtrace_entry(void *arg, unsigned long where)
+{
+	unsigned long *stacktrace = this_cpu_ptr(pkvm_stacktrace);
+	int *idx = (int *)arg;
+
+	/*
+	 * Need 2 free slots: 1 for current entry and 1 for the
+	 * delimiter.
+	 */
+	if (*idx > ARRAY_SIZE(pkvm_stacktrace) - 2)
+		return false;
+
+	stacktrace[*idx] = where;
+	stacktrace[++*idx] = 0UL;
+
+	return true;
+}
+
+/*
+ * pkvm_save_backtrace - Saves the protected nVHE HYP stacktrace
+ *
+ * @fp : frame pointer at which to start the unwinding.
+ * @pc : program counter at which to start the unwinding.
+ *
+ * Save the unwinded stack addresses to the shared stacktrace buffer.
+ * The host can access this shared buffer from EL1 to dump the backtrace.
+ */
+static void pkvm_save_backtrace(unsigned long fp, unsigned long pc)
+{
+	struct stack_info stacks[] = {
+		stackinfo_get_overflow(),
+		stackinfo_get_hyp(),
+	};
+	struct unwind_state state = {
+		.stacks = stacks,
+		.nr_stacks = ARRAY_SIZE(stacks),
+	};
+	int idx = 0;
+
+	kvm_nvhe_unwind_init(&state, fp, pc);
+
+	unwind(&state, pkvm_save_backtrace_entry, &idx);
+}
+#else /* !CONFIG_PROTECTED_NVHE_STACKTRACE */
+static void pkvm_save_backtrace(unsigned long fp, unsigned long pc)
+{
+}
+#endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */
+
+/*
+ * kvm_nvhe_prepare_backtrace - prepare to dump the nVHE backtrace
+ *
+ * @fp : frame pointer at which to start the unwinding.
+ * @pc : program counter at which to start the unwinding.
+ *
+ * Saves the information needed by the host to dump the nVHE hypervisor
+ * backtrace.
+ */
+void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc)
+{
+	if (is_protected_kvm_enabled())
+		pkvm_save_backtrace(fp, pc);
+	else
+		hyp_prepare_backtrace(fp, pc);
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
new file mode 100644
index 000000000..895fb3200
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -0,0 +1,372 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/switch.h>
+#include <hyp/sysreg-sr.h>
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+#include <linux/types.h>
+#include <linux/jump_label.h>
+#include <uapi/linux/psci.h>
+
+#include <kvm/arm_psci.h>
+
+#include <asm/barrier.h>
+#include <asm/cpufeature.h>
+#include <asm/kprobes.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/fpsimd.h>
+#include <asm/debug-monitors.h>
+#include <asm/processor.h>
+
+#include <nvhe/fixed_config.h>
+#include <nvhe/mem_protect.h>
+
+/* Non-VHE specific context */
+DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data);
+DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
+DEFINE_PER_CPU(unsigned long, kvm_hyp_vector);
+
+extern void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc);
+
+static void __activate_traps(struct kvm_vcpu *vcpu)
+{
+	u64 val;
+
+	___activate_traps(vcpu);
+	__activate_traps_common(vcpu);
+
+	val = vcpu->arch.cptr_el2;
+	val |= CPTR_EL2_TTA | CPTR_EL2_TAM;
+	if (!guest_owns_fp_regs(vcpu)) {
+		val |= CPTR_EL2_TFP | CPTR_EL2_TZ;
+		__activate_traps_fpsimd32(vcpu);
+	}
+	if (cpus_have_final_cap(ARM64_SME))
+		val |= CPTR_EL2_TSM;
+
+	write_sysreg(val, cptr_el2);
+	write_sysreg(__this_cpu_read(kvm_hyp_vector), vbar_el2);
+
+	if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
+		struct kvm_cpu_context *ctxt = &vcpu->arch.ctxt;
+
+		isb();
+		/*
+		 * At this stage, and thanks to the above isb(), S2 is
+		 * configured and enabled. We can now restore the guest's S1
+		 * configuration: SCTLR, and only then TCR.
+		 */
+		write_sysreg_el1(ctxt_sys_reg(ctxt, SCTLR_EL1),	SYS_SCTLR);
+		isb();
+		write_sysreg_el1(ctxt_sys_reg(ctxt, TCR_EL1),	SYS_TCR);
+	}
+}
+
+static void __deactivate_traps(struct kvm_vcpu *vcpu)
+{
+	extern char __kvm_hyp_host_vector[];
+	u64 cptr;
+
+	___deactivate_traps(vcpu);
+
+	if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
+		u64 val;
+
+		/*
+		 * Set the TCR and SCTLR registers in the exact opposite
+		 * sequence as __activate_traps (first prevent walks,
+		 * then force the MMU on). A generous sprinkling of isb()
+		 * ensure that things happen in this exact order.
+		 */
+		val = read_sysreg_el1(SYS_TCR);
+		write_sysreg_el1(val | TCR_EPD1_MASK | TCR_EPD0_MASK, SYS_TCR);
+		isb();
+		val = read_sysreg_el1(SYS_SCTLR);
+		write_sysreg_el1(val | SCTLR_ELx_M, SYS_SCTLR);
+		isb();
+	}
+
+	__deactivate_traps_common(vcpu);
+
+	write_sysreg(this_cpu_ptr(&kvm_init_params)->hcr_el2, hcr_el2);
+
+	cptr = CPTR_EL2_DEFAULT;
+	if (vcpu_has_sve(vcpu) && (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED))
+		cptr |= CPTR_EL2_TZ;
+	if (cpus_have_final_cap(ARM64_SME))
+		cptr &= ~CPTR_EL2_TSM;
+
+	write_sysreg(cptr, cptr_el2);
+	write_sysreg(__kvm_hyp_host_vector, vbar_el2);
+}
+
+/* Save VGICv3 state on non-VHE systems */
+static void __hyp_vgic_save_state(struct kvm_vcpu *vcpu)
+{
+	if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) {
+		__vgic_v3_save_state(&vcpu->arch.vgic_cpu.vgic_v3);
+		__vgic_v3_deactivate_traps(&vcpu->arch.vgic_cpu.vgic_v3);
+	}
+}
+
+/* Restore VGICv3 state on non-VHE systems */
+static void __hyp_vgic_restore_state(struct kvm_vcpu *vcpu)
+{
+	if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) {
+		__vgic_v3_activate_traps(&vcpu->arch.vgic_cpu.vgic_v3);
+		__vgic_v3_restore_state(&vcpu->arch.vgic_cpu.vgic_v3);
+	}
+}
+
+/*
+ * Disable host events, enable guest events
+ */
+#ifdef CONFIG_HW_PERF_EVENTS
+static bool __pmu_switch_to_guest(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu_events *pmu = &vcpu->arch.pmu.events;
+
+	if (pmu->events_host)
+		write_sysreg(pmu->events_host, pmcntenclr_el0);
+
+	if (pmu->events_guest)
+		write_sysreg(pmu->events_guest, pmcntenset_el0);
+
+	return (pmu->events_host || pmu->events_guest);
+}
+
+/*
+ * Disable guest events, enable host events
+ */
+static void __pmu_switch_to_host(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu_events *pmu = &vcpu->arch.pmu.events;
+
+	if (pmu->events_guest)
+		write_sysreg(pmu->events_guest, pmcntenclr_el0);
+
+	if (pmu->events_host)
+		write_sysreg(pmu->events_host, pmcntenset_el0);
+}
+#else
+#define __pmu_switch_to_guest(v)	({ false; })
+#define __pmu_switch_to_host(v)		do {} while (0)
+#endif
+
+/*
+ * Handler for protected VM MSR, MRS or System instruction execution in AArch64.
+ *
+ * Returns true if the hypervisor has handled the exit, and control should go
+ * back to the guest, or false if it hasn't.
+ */
+static bool kvm_handle_pvm_sys64(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	/*
+	 * Make sure we handle the exit for workarounds and ptrauth
+	 * before the pKVM handling, as the latter could decide to
+	 * UNDEF.
+	 */
+	return (kvm_hyp_handle_sysreg(vcpu, exit_code) ||
+		kvm_handle_pvm_sysreg(vcpu, exit_code));
+}
+
+static const exit_handler_fn hyp_exit_handlers[] = {
+	[0 ... ESR_ELx_EC_MAX]		= NULL,
+	[ESR_ELx_EC_CP15_32]		= kvm_hyp_handle_cp15_32,
+	[ESR_ELx_EC_SYS64]		= kvm_hyp_handle_sysreg,
+	[ESR_ELx_EC_SVE]		= kvm_hyp_handle_fpsimd,
+	[ESR_ELx_EC_FP_ASIMD]		= kvm_hyp_handle_fpsimd,
+	[ESR_ELx_EC_IABT_LOW]		= kvm_hyp_handle_iabt_low,
+	[ESR_ELx_EC_DABT_LOW]		= kvm_hyp_handle_dabt_low,
+	[ESR_ELx_EC_WATCHPT_LOW]	= kvm_hyp_handle_watchpt_low,
+	[ESR_ELx_EC_PAC]		= kvm_hyp_handle_ptrauth,
+};
+
+static const exit_handler_fn pvm_exit_handlers[] = {
+	[0 ... ESR_ELx_EC_MAX]		= NULL,
+	[ESR_ELx_EC_SYS64]		= kvm_handle_pvm_sys64,
+	[ESR_ELx_EC_SVE]		= kvm_handle_pvm_restricted,
+	[ESR_ELx_EC_FP_ASIMD]		= kvm_hyp_handle_fpsimd,
+	[ESR_ELx_EC_IABT_LOW]		= kvm_hyp_handle_iabt_low,
+	[ESR_ELx_EC_DABT_LOW]		= kvm_hyp_handle_dabt_low,
+	[ESR_ELx_EC_WATCHPT_LOW]	= kvm_hyp_handle_watchpt_low,
+	[ESR_ELx_EC_PAC]		= kvm_hyp_handle_ptrauth,
+};
+
+static const exit_handler_fn *kvm_get_exit_handler_array(struct kvm_vcpu *vcpu)
+{
+	if (unlikely(kvm_vm_is_protected(kern_hyp_va(vcpu->kvm))))
+		return pvm_exit_handlers;
+
+	return hyp_exit_handlers;
+}
+
+/*
+ * Some guests (e.g., protected VMs) are not be allowed to run in AArch32.
+ * The ARMv8 architecture does not give the hypervisor a mechanism to prevent a
+ * guest from dropping to AArch32 EL0 if implemented by the CPU. If the
+ * hypervisor spots a guest in such a state ensure it is handled, and don't
+ * trust the host to spot or fix it.  The check below is based on the one in
+ * kvm_arch_vcpu_ioctl_run().
+ *
+ * Returns false if the guest ran in AArch32 when it shouldn't have, and
+ * thus should exit to the host, or true if a the guest run loop can continue.
+ */
+static void early_exit_filter(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	struct kvm *kvm = kern_hyp_va(vcpu->kvm);
+
+	if (kvm_vm_is_protected(kvm) && vcpu_mode_is_32bit(vcpu)) {
+		/*
+		 * As we have caught the guest red-handed, decide that it isn't
+		 * fit for purpose anymore by making the vcpu invalid. The VMM
+		 * can try and fix it by re-initializing the vcpu with
+		 * KVM_ARM_VCPU_INIT, however, this is likely not possible for
+		 * protected VMs.
+		 */
+		vcpu->arch.target = -1;
+		*exit_code &= BIT(ARM_EXIT_WITH_SERROR_BIT);
+		*exit_code |= ARM_EXCEPTION_IL;
+	}
+}
+
+/* Switch to the guest for legacy non-VHE systems */
+int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpu_context *host_ctxt;
+	struct kvm_cpu_context *guest_ctxt;
+	struct kvm_s2_mmu *mmu;
+	bool pmu_switch_needed;
+	u64 exit_code;
+
+	/*
+	 * Having IRQs masked via PMR when entering the guest means the GIC
+	 * will not signal the CPU of interrupts of lower priority, and the
+	 * only way to get out will be via guest exceptions.
+	 * Naturally, we want to avoid this.
+	 */
+	if (system_uses_irq_prio_masking()) {
+		gic_write_pmr(GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET);
+		pmr_sync();
+	}
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	host_ctxt->__hyp_running_vcpu = vcpu;
+	guest_ctxt = &vcpu->arch.ctxt;
+
+	pmu_switch_needed = __pmu_switch_to_guest(vcpu);
+
+	__sysreg_save_state_nvhe(host_ctxt);
+	/*
+	 * We must flush and disable the SPE buffer for nVHE, as
+	 * the translation regime(EL1&0) is going to be loaded with
+	 * that of the guest. And we must do this before we change the
+	 * translation regime to EL2 (via MDCR_EL2_E2PB == 0) and
+	 * before we load guest Stage1.
+	 */
+	__debug_save_host_buffers_nvhe(vcpu);
+
+	__kvm_adjust_pc(vcpu);
+
+	/*
+	 * We must restore the 32-bit state before the sysregs, thanks
+	 * to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72).
+	 *
+	 * Also, and in order to be able to deal with erratum #1319537 (A57)
+	 * and #1319367 (A72), we must ensure that all VM-related sysreg are
+	 * restored before we enable S2 translation.
+	 */
+	__sysreg32_restore_state(vcpu);
+	__sysreg_restore_state_nvhe(guest_ctxt);
+
+	mmu = kern_hyp_va(vcpu->arch.hw_mmu);
+	__load_stage2(mmu, kern_hyp_va(mmu->arch));
+	__activate_traps(vcpu);
+
+	__hyp_vgic_restore_state(vcpu);
+	__timer_enable_traps(vcpu);
+
+	__debug_switch_to_guest(vcpu);
+
+	do {
+		/* Jump in the fire! */
+		exit_code = __guest_enter(vcpu);
+
+		/* And we're baaack! */
+	} while (fixup_guest_exit(vcpu, &exit_code));
+
+	__sysreg_save_state_nvhe(guest_ctxt);
+	__sysreg32_save_state(vcpu);
+	__timer_disable_traps(vcpu);
+	__hyp_vgic_save_state(vcpu);
+
+	__deactivate_traps(vcpu);
+	__load_host_stage2();
+
+	__sysreg_restore_state_nvhe(host_ctxt);
+
+	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED)
+		__fpsimd_save_fpexc32(vcpu);
+
+	__debug_switch_to_host(vcpu);
+	/*
+	 * This must come after restoring the host sysregs, since a non-VHE
+	 * system may enable SPE here and make use of the TTBRs.
+	 */
+	__debug_restore_host_buffers_nvhe(vcpu);
+
+	if (pmu_switch_needed)
+		__pmu_switch_to_host(vcpu);
+
+	/* Returning to host will clear PSR.I, remask PMR if needed */
+	if (system_uses_irq_prio_masking())
+		gic_write_pmr(GIC_PRIO_IRQOFF);
+
+	host_ctxt->__hyp_running_vcpu = NULL;
+
+	return exit_code;
+}
+
+asmlinkage void __noreturn hyp_panic(void)
+{
+	u64 spsr = read_sysreg_el2(SYS_SPSR);
+	u64 elr = read_sysreg_el2(SYS_ELR);
+	u64 par = read_sysreg_par();
+	struct kvm_cpu_context *host_ctxt;
+	struct kvm_vcpu *vcpu;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	vcpu = host_ctxt->__hyp_running_vcpu;
+
+	if (vcpu) {
+		__timer_disable_traps(vcpu);
+		__deactivate_traps(vcpu);
+		__load_host_stage2();
+		__sysreg_restore_state_nvhe(host_ctxt);
+	}
+
+	/* Prepare to dump kvm nvhe hyp stacktrace */
+	kvm_nvhe_prepare_backtrace((unsigned long)__builtin_frame_address(0),
+				   _THIS_IP_);
+
+	__hyp_do_panic(host_ctxt, spsr, elr, par);
+	unreachable();
+}
+
+asmlinkage void __noreturn hyp_panic_bad_stack(void)
+{
+	hyp_panic();
+}
+
+asmlinkage void kvm_unexpected_el2_exception(void)
+{
+	__kvm_unexpected_el2_exception();
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/sys_regs.c b/arch/arm64/kvm/hyp/nvhe/sys_regs.c
new file mode 100644
index 000000000..3d5121ee3
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/sys_regs.c
@@ -0,0 +1,515 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021 Google LLC
+ * Author: Fuad Tabba <tabba@google.com>
+ */
+
+#include <linux/irqchip/arm-gic-v3.h>
+
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+
+#include <hyp/adjust_pc.h>
+
+#include <nvhe/fixed_config.h>
+
+#include "../../sys_regs.h"
+
+/*
+ * Copies of the host's CPU features registers holding sanitized values at hyp.
+ */
+u64 id_aa64pfr0_el1_sys_val;
+u64 id_aa64pfr1_el1_sys_val;
+u64 id_aa64isar0_el1_sys_val;
+u64 id_aa64isar1_el1_sys_val;
+u64 id_aa64isar2_el1_sys_val;
+u64 id_aa64mmfr0_el1_sys_val;
+u64 id_aa64mmfr1_el1_sys_val;
+u64 id_aa64mmfr2_el1_sys_val;
+
+/*
+ * Inject an unknown/undefined exception to an AArch64 guest while most of its
+ * sysregs are live.
+ */
+static void inject_undef64(struct kvm_vcpu *vcpu)
+{
+	u64 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);
+
+	*vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR);
+	*vcpu_cpsr(vcpu) = read_sysreg_el2(SYS_SPSR);
+
+	kvm_pend_exception(vcpu, EXCEPT_AA64_EL1_SYNC);
+
+	__kvm_adjust_pc(vcpu);
+
+	write_sysreg_el1(esr, SYS_ESR);
+	write_sysreg_el1(read_sysreg_el2(SYS_ELR), SYS_ELR);
+	write_sysreg_el2(*vcpu_pc(vcpu), SYS_ELR);
+	write_sysreg_el2(*vcpu_cpsr(vcpu), SYS_SPSR);
+}
+
+/*
+ * Returns the restricted features values of the feature register based on the
+ * limitations in restrict_fields.
+ * A feature id field value of 0b0000 does not impose any restrictions.
+ * Note: Use only for unsigned feature field values.
+ */
+static u64 get_restricted_features_unsigned(u64 sys_reg_val,
+					    u64 restrict_fields)
+{
+	u64 value = 0UL;
+	u64 mask = GENMASK_ULL(ARM64_FEATURE_FIELD_BITS - 1, 0);
+
+	/*
+	 * According to the Arm Architecture Reference Manual, feature fields
+	 * use increasing values to indicate increases in functionality.
+	 * Iterate over the restricted feature fields and calculate the minimum
+	 * unsigned value between the one supported by the system, and what the
+	 * value is being restricted to.
+	 */
+	while (sys_reg_val && restrict_fields) {
+		value |= min(sys_reg_val & mask, restrict_fields & mask);
+		sys_reg_val &= ~mask;
+		restrict_fields &= ~mask;
+		mask <<= ARM64_FEATURE_FIELD_BITS;
+	}
+
+	return value;
+}
+
+/*
+ * Functions that return the value of feature id registers for protected VMs
+ * based on allowed features, system features, and KVM support.
+ */
+
+static u64 get_pvm_id_aa64pfr0(const struct kvm_vcpu *vcpu)
+{
+	u64 set_mask = 0;
+	u64 allow_mask = PVM_ID_AA64PFR0_ALLOW;
+
+	set_mask |= get_restricted_features_unsigned(id_aa64pfr0_el1_sys_val,
+		PVM_ID_AA64PFR0_RESTRICT_UNSIGNED);
+
+	return (id_aa64pfr0_el1_sys_val & allow_mask) | set_mask;
+}
+
+static u64 get_pvm_id_aa64pfr1(const struct kvm_vcpu *vcpu)
+{
+	const struct kvm *kvm = (const struct kvm *)kern_hyp_va(vcpu->kvm);
+	u64 allow_mask = PVM_ID_AA64PFR1_ALLOW;
+
+	if (!kvm_has_mte(kvm))
+		allow_mask &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE);
+
+	return id_aa64pfr1_el1_sys_val & allow_mask;
+}
+
+static u64 get_pvm_id_aa64zfr0(const struct kvm_vcpu *vcpu)
+{
+	/*
+	 * No support for Scalable Vectors, therefore, hyp has no sanitized
+	 * copy of the feature id register.
+	 */
+	BUILD_BUG_ON(PVM_ID_AA64ZFR0_ALLOW != 0ULL);
+	return 0;
+}
+
+static u64 get_pvm_id_aa64dfr0(const struct kvm_vcpu *vcpu)
+{
+	/*
+	 * No support for debug, including breakpoints, and watchpoints,
+	 * therefore, pKVM has no sanitized copy of the feature id register.
+	 */
+	BUILD_BUG_ON(PVM_ID_AA64DFR0_ALLOW != 0ULL);
+	return 0;
+}
+
+static u64 get_pvm_id_aa64dfr1(const struct kvm_vcpu *vcpu)
+{
+	/*
+	 * No support for debug, therefore, hyp has no sanitized copy of the
+	 * feature id register.
+	 */
+	BUILD_BUG_ON(PVM_ID_AA64DFR1_ALLOW != 0ULL);
+	return 0;
+}
+
+static u64 get_pvm_id_aa64afr0(const struct kvm_vcpu *vcpu)
+{
+	/*
+	 * No support for implementation defined features, therefore, hyp has no
+	 * sanitized copy of the feature id register.
+	 */
+	BUILD_BUG_ON(PVM_ID_AA64AFR0_ALLOW != 0ULL);
+	return 0;
+}
+
+static u64 get_pvm_id_aa64afr1(const struct kvm_vcpu *vcpu)
+{
+	/*
+	 * No support for implementation defined features, therefore, hyp has no
+	 * sanitized copy of the feature id register.
+	 */
+	BUILD_BUG_ON(PVM_ID_AA64AFR1_ALLOW != 0ULL);
+	return 0;
+}
+
+static u64 get_pvm_id_aa64isar0(const struct kvm_vcpu *vcpu)
+{
+	return id_aa64isar0_el1_sys_val & PVM_ID_AA64ISAR0_ALLOW;
+}
+
+static u64 get_pvm_id_aa64isar1(const struct kvm_vcpu *vcpu)
+{
+	u64 allow_mask = PVM_ID_AA64ISAR1_ALLOW;
+
+	if (!vcpu_has_ptrauth(vcpu))
+		allow_mask &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA) |
+				ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API) |
+				ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPA) |
+				ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPI));
+
+	return id_aa64isar1_el1_sys_val & allow_mask;
+}
+
+static u64 get_pvm_id_aa64isar2(const struct kvm_vcpu *vcpu)
+{
+	u64 allow_mask = PVM_ID_AA64ISAR2_ALLOW;
+
+	if (!vcpu_has_ptrauth(vcpu))
+		allow_mask &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) |
+				ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3));
+
+	return id_aa64isar2_el1_sys_val & allow_mask;
+}
+
+static u64 get_pvm_id_aa64mmfr0(const struct kvm_vcpu *vcpu)
+{
+	u64 set_mask;
+
+	set_mask = get_restricted_features_unsigned(id_aa64mmfr0_el1_sys_val,
+		PVM_ID_AA64MMFR0_RESTRICT_UNSIGNED);
+
+	return (id_aa64mmfr0_el1_sys_val & PVM_ID_AA64MMFR0_ALLOW) | set_mask;
+}
+
+static u64 get_pvm_id_aa64mmfr1(const struct kvm_vcpu *vcpu)
+{
+	return id_aa64mmfr1_el1_sys_val & PVM_ID_AA64MMFR1_ALLOW;
+}
+
+static u64 get_pvm_id_aa64mmfr2(const struct kvm_vcpu *vcpu)
+{
+	return id_aa64mmfr2_el1_sys_val & PVM_ID_AA64MMFR2_ALLOW;
+}
+
+/* Read a sanitized cpufeature ID register by its encoding */
+u64 pvm_read_id_reg(const struct kvm_vcpu *vcpu, u32 id)
+{
+	switch (id) {
+	case SYS_ID_AA64PFR0_EL1:
+		return get_pvm_id_aa64pfr0(vcpu);
+	case SYS_ID_AA64PFR1_EL1:
+		return get_pvm_id_aa64pfr1(vcpu);
+	case SYS_ID_AA64ZFR0_EL1:
+		return get_pvm_id_aa64zfr0(vcpu);
+	case SYS_ID_AA64DFR0_EL1:
+		return get_pvm_id_aa64dfr0(vcpu);
+	case SYS_ID_AA64DFR1_EL1:
+		return get_pvm_id_aa64dfr1(vcpu);
+	case SYS_ID_AA64AFR0_EL1:
+		return get_pvm_id_aa64afr0(vcpu);
+	case SYS_ID_AA64AFR1_EL1:
+		return get_pvm_id_aa64afr1(vcpu);
+	case SYS_ID_AA64ISAR0_EL1:
+		return get_pvm_id_aa64isar0(vcpu);
+	case SYS_ID_AA64ISAR1_EL1:
+		return get_pvm_id_aa64isar1(vcpu);
+	case SYS_ID_AA64ISAR2_EL1:
+		return get_pvm_id_aa64isar2(vcpu);
+	case SYS_ID_AA64MMFR0_EL1:
+		return get_pvm_id_aa64mmfr0(vcpu);
+	case SYS_ID_AA64MMFR1_EL1:
+		return get_pvm_id_aa64mmfr1(vcpu);
+	case SYS_ID_AA64MMFR2_EL1:
+		return get_pvm_id_aa64mmfr2(vcpu);
+	default:
+		/* Unhandled ID register, RAZ */
+		return 0;
+	}
+}
+
+static u64 read_id_reg(const struct kvm_vcpu *vcpu,
+		       struct sys_reg_desc const *r)
+{
+	return pvm_read_id_reg(vcpu, reg_to_encoding(r));
+}
+
+/* Handler to RAZ/WI sysregs */
+static bool pvm_access_raz_wi(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			      const struct sys_reg_desc *r)
+{
+	if (!p->is_write)
+		p->regval = 0;
+
+	return true;
+}
+
+/*
+ * Accessor for AArch32 feature id registers.
+ *
+ * The value of these registers is "unknown" according to the spec if AArch32
+ * isn't supported.
+ */
+static bool pvm_access_id_aarch32(struct kvm_vcpu *vcpu,
+				  struct sys_reg_params *p,
+				  const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		inject_undef64(vcpu);
+		return false;
+	}
+
+	/*
+	 * No support for AArch32 guests, therefore, pKVM has no sanitized copy
+	 * of AArch32 feature id registers.
+	 */
+	BUILD_BUG_ON(FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL1),
+		     PVM_ID_AA64PFR0_RESTRICT_UNSIGNED) > ID_AA64PFR0_EL1_ELx_64BIT_ONLY);
+
+	return pvm_access_raz_wi(vcpu, p, r);
+}
+
+/*
+ * Accessor for AArch64 feature id registers.
+ *
+ * If access is allowed, set the regval to the protected VM's view of the
+ * register and return true.
+ * Otherwise, inject an undefined exception and return false.
+ */
+static bool pvm_access_id_aarch64(struct kvm_vcpu *vcpu,
+				  struct sys_reg_params *p,
+				  const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		inject_undef64(vcpu);
+		return false;
+	}
+
+	p->regval = read_id_reg(vcpu, r);
+	return true;
+}
+
+static bool pvm_gic_read_sre(struct kvm_vcpu *vcpu,
+			     struct sys_reg_params *p,
+			     const struct sys_reg_desc *r)
+{
+	/* pVMs only support GICv3. 'nuf said. */
+	if (!p->is_write)
+		p->regval = ICC_SRE_EL1_DIB | ICC_SRE_EL1_DFB | ICC_SRE_EL1_SRE;
+
+	return true;
+}
+
+/* Mark the specified system register as an AArch32 feature id register. */
+#define AARCH32(REG) { SYS_DESC(REG), .access = pvm_access_id_aarch32 }
+
+/* Mark the specified system register as an AArch64 feature id register. */
+#define AARCH64(REG) { SYS_DESC(REG), .access = pvm_access_id_aarch64 }
+
+/*
+ * sys_reg_desc initialiser for architecturally unallocated cpufeature ID
+ * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2
+ * (1 <= crm < 8, 0 <= Op2 < 8).
+ */
+#define ID_UNALLOCATED(crm, op2) {			\
+	Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2),	\
+	.access = pvm_access_id_aarch64,		\
+}
+
+/* Mark the specified system register as Read-As-Zero/Write-Ignored */
+#define RAZ_WI(REG) { SYS_DESC(REG), .access = pvm_access_raz_wi }
+
+/* Mark the specified system register as not being handled in hyp. */
+#define HOST_HANDLED(REG) { SYS_DESC(REG), .access = NULL }
+
+/*
+ * Architected system registers.
+ * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
+ *
+ * NOTE: Anything not explicitly listed here is *restricted by default*, i.e.,
+ * it will lead to injecting an exception into the guest.
+ */
+static const struct sys_reg_desc pvm_sys_reg_descs[] = {
+	/* Cache maintenance by set/way operations are restricted. */
+
+	/* Debug and Trace Registers are restricted. */
+
+	/* AArch64 mappings of the AArch32 ID registers */
+	/* CRm=1 */
+	AARCH32(SYS_ID_PFR0_EL1),
+	AARCH32(SYS_ID_PFR1_EL1),
+	AARCH32(SYS_ID_DFR0_EL1),
+	AARCH32(SYS_ID_AFR0_EL1),
+	AARCH32(SYS_ID_MMFR0_EL1),
+	AARCH32(SYS_ID_MMFR1_EL1),
+	AARCH32(SYS_ID_MMFR2_EL1),
+	AARCH32(SYS_ID_MMFR3_EL1),
+
+	/* CRm=2 */
+	AARCH32(SYS_ID_ISAR0_EL1),
+	AARCH32(SYS_ID_ISAR1_EL1),
+	AARCH32(SYS_ID_ISAR2_EL1),
+	AARCH32(SYS_ID_ISAR3_EL1),
+	AARCH32(SYS_ID_ISAR4_EL1),
+	AARCH32(SYS_ID_ISAR5_EL1),
+	AARCH32(SYS_ID_MMFR4_EL1),
+	AARCH32(SYS_ID_ISAR6_EL1),
+
+	/* CRm=3 */
+	AARCH32(SYS_MVFR0_EL1),
+	AARCH32(SYS_MVFR1_EL1),
+	AARCH32(SYS_MVFR2_EL1),
+	ID_UNALLOCATED(3,3),
+	AARCH32(SYS_ID_PFR2_EL1),
+	AARCH32(SYS_ID_DFR1_EL1),
+	AARCH32(SYS_ID_MMFR5_EL1),
+	ID_UNALLOCATED(3,7),
+
+	/* AArch64 ID registers */
+	/* CRm=4 */
+	AARCH64(SYS_ID_AA64PFR0_EL1),
+	AARCH64(SYS_ID_AA64PFR1_EL1),
+	ID_UNALLOCATED(4,2),
+	ID_UNALLOCATED(4,3),
+	AARCH64(SYS_ID_AA64ZFR0_EL1),
+	ID_UNALLOCATED(4,5),
+	ID_UNALLOCATED(4,6),
+	ID_UNALLOCATED(4,7),
+	AARCH64(SYS_ID_AA64DFR0_EL1),
+	AARCH64(SYS_ID_AA64DFR1_EL1),
+	ID_UNALLOCATED(5,2),
+	ID_UNALLOCATED(5,3),
+	AARCH64(SYS_ID_AA64AFR0_EL1),
+	AARCH64(SYS_ID_AA64AFR1_EL1),
+	ID_UNALLOCATED(5,6),
+	ID_UNALLOCATED(5,7),
+	AARCH64(SYS_ID_AA64ISAR0_EL1),
+	AARCH64(SYS_ID_AA64ISAR1_EL1),
+	AARCH64(SYS_ID_AA64ISAR2_EL1),
+	ID_UNALLOCATED(6,3),
+	ID_UNALLOCATED(6,4),
+	ID_UNALLOCATED(6,5),
+	ID_UNALLOCATED(6,6),
+	ID_UNALLOCATED(6,7),
+	AARCH64(SYS_ID_AA64MMFR0_EL1),
+	AARCH64(SYS_ID_AA64MMFR1_EL1),
+	AARCH64(SYS_ID_AA64MMFR2_EL1),
+	ID_UNALLOCATED(7,3),
+	ID_UNALLOCATED(7,4),
+	ID_UNALLOCATED(7,5),
+	ID_UNALLOCATED(7,6),
+	ID_UNALLOCATED(7,7),
+
+	/* Scalable Vector Registers are restricted. */
+
+	RAZ_WI(SYS_ERRIDR_EL1),
+	RAZ_WI(SYS_ERRSELR_EL1),
+	RAZ_WI(SYS_ERXFR_EL1),
+	RAZ_WI(SYS_ERXCTLR_EL1),
+	RAZ_WI(SYS_ERXSTATUS_EL1),
+	RAZ_WI(SYS_ERXADDR_EL1),
+	RAZ_WI(SYS_ERXMISC0_EL1),
+	RAZ_WI(SYS_ERXMISC1_EL1),
+
+	/* Performance Monitoring Registers are restricted. */
+
+	/* Limited Ordering Regions Registers are restricted. */
+
+	HOST_HANDLED(SYS_ICC_SGI1R_EL1),
+	HOST_HANDLED(SYS_ICC_ASGI1R_EL1),
+	HOST_HANDLED(SYS_ICC_SGI0R_EL1),
+	{ SYS_DESC(SYS_ICC_SRE_EL1), .access = pvm_gic_read_sre, },
+
+	HOST_HANDLED(SYS_CCSIDR_EL1),
+	HOST_HANDLED(SYS_CLIDR_EL1),
+	HOST_HANDLED(SYS_CSSELR_EL1),
+	HOST_HANDLED(SYS_CTR_EL0),
+
+	/* Performance Monitoring Registers are restricted. */
+
+	/* Activity Monitoring Registers are restricted. */
+
+	HOST_HANDLED(SYS_CNTP_TVAL_EL0),
+	HOST_HANDLED(SYS_CNTP_CTL_EL0),
+	HOST_HANDLED(SYS_CNTP_CVAL_EL0),
+
+	/* Performance Monitoring Registers are restricted. */
+};
+
+/*
+ * Checks that the sysreg table is unique and in-order.
+ *
+ * Returns 0 if the table is consistent, or 1 otherwise.
+ */
+int kvm_check_pvm_sysreg_table(void)
+{
+	unsigned int i;
+
+	for (i = 1; i < ARRAY_SIZE(pvm_sys_reg_descs); i++) {
+		if (cmp_sys_reg(&pvm_sys_reg_descs[i-1], &pvm_sys_reg_descs[i]) >= 0)
+			return 1;
+	}
+
+	return 0;
+}
+
+/*
+ * Handler for protected VM MSR, MRS or System instruction execution.
+ *
+ * Returns true if the hypervisor has handled the exit, and control should go
+ * back to the guest, or false if it hasn't, to be handled by the host.
+ */
+bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	const struct sys_reg_desc *r;
+	struct sys_reg_params params;
+	unsigned long esr = kvm_vcpu_get_esr(vcpu);
+	int Rt = kvm_vcpu_sys_get_rt(vcpu);
+
+	params = esr_sys64_to_params(esr);
+	params.regval = vcpu_get_reg(vcpu, Rt);
+
+	r = find_reg(&params, pvm_sys_reg_descs, ARRAY_SIZE(pvm_sys_reg_descs));
+
+	/* Undefined (RESTRICTED). */
+	if (r == NULL) {
+		inject_undef64(vcpu);
+		return true;
+	}
+
+	/* Handled by the host (HOST_HANDLED) */
+	if (r->access == NULL)
+		return false;
+
+	/* Handled by hyp: skip instruction if instructed to do so. */
+	if (r->access(vcpu, &params, r))
+		__kvm_skip_instr(vcpu);
+
+	if (!params.is_write)
+		vcpu_set_reg(vcpu, Rt, params.regval);
+
+	return true;
+}
+
+/*
+ * Handler for protected VM restricted exceptions.
+ *
+ * Inject an undefined exception into the guest and return true to indicate that
+ * the hypervisor has handled the exit, and control should go back to the guest.
+ */
+bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	inject_undef64(vcpu);
+	return true;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c b/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c
new file mode 100644
index 000000000..29305022b
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/sysreg-sr.h>
+
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kprobes.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+
+/*
+ * Non-VHE: Both host and guest must save everything.
+ */
+
+void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt)
+{
+	__sysreg_save_el1_state(ctxt);
+	__sysreg_save_common_state(ctxt);
+	__sysreg_save_user_state(ctxt);
+	__sysreg_save_el2_return_state(ctxt);
+}
+
+void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt)
+{
+	__sysreg_restore_el1_state(ctxt);
+	__sysreg_restore_common_state(ctxt);
+	__sysreg_restore_user_state(ctxt);
+	__sysreg_restore_el2_return_state(ctxt);
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/timer-sr.c b/arch/arm64/kvm/hyp/nvhe/timer-sr.c
new file mode 100644
index 000000000..9072e7169
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/timer-sr.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <clocksource/arm_arch_timer.h>
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_hyp.h>
+
+void __kvm_timer_set_cntvoff(u64 cntvoff)
+{
+	write_sysreg(cntvoff, cntvoff_el2);
+}
+
+/*
+ * Should only be called on non-VHE systems.
+ * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
+ */
+void __timer_disable_traps(struct kvm_vcpu *vcpu)
+{
+	u64 val;
+
+	/* Allow physical timer/counter access for the host */
+	val = read_sysreg(cnthctl_el2);
+	val |= CNTHCTL_EL1PCTEN | CNTHCTL_EL1PCEN;
+	write_sysreg(val, cnthctl_el2);
+}
+
+/*
+ * Should only be called on non-VHE systems.
+ * VHE systems use EL2 timers and configure EL1 timers in kvm_timer_init_vhe().
+ */
+void __timer_enable_traps(struct kvm_vcpu *vcpu)
+{
+	u64 val;
+
+	/*
+	 * Disallow physical timer access for the guest
+	 * Physical counter access is allowed
+	 */
+	val = read_sysreg(cnthctl_el2);
+	val &= ~CNTHCTL_EL1PCEN;
+	val |= CNTHCTL_EL1PCTEN;
+	write_sysreg(val, cnthctl_el2);
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/tlb.c b/arch/arm64/kvm/hyp/nvhe/tlb.c
new file mode 100644
index 000000000..d296d617f
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/tlb.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/tlbflush.h>
+
+#include <nvhe/mem_protect.h>
+
+struct tlb_inv_context {
+	u64		tcr;
+};
+
+static void __tlb_switch_to_guest(struct kvm_s2_mmu *mmu,
+				  struct tlb_inv_context *cxt)
+{
+	if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
+		u64 val;
+
+		/*
+		 * For CPUs that are affected by ARM 1319367, we need to
+		 * avoid a host Stage-1 walk while we have the guest's
+		 * VMID set in the VTTBR in order to invalidate TLBs.
+		 * We're guaranteed that the S1 MMU is enabled, so we can
+		 * simply set the EPD bits to avoid any further TLB fill.
+		 */
+		val = cxt->tcr = read_sysreg_el1(SYS_TCR);
+		val |= TCR_EPD1_MASK | TCR_EPD0_MASK;
+		write_sysreg_el1(val, SYS_TCR);
+		isb();
+	}
+
+	/*
+	 * __load_stage2() includes an ISB only when the AT
+	 * workaround is applied. Take care of the opposite condition,
+	 * ensuring that we always have an ISB, but not two ISBs back
+	 * to back.
+	 */
+	__load_stage2(mmu, kern_hyp_va(mmu->arch));
+	asm(ALTERNATIVE("isb", "nop", ARM64_WORKAROUND_SPECULATIVE_AT));
+}
+
+static void __tlb_switch_to_host(struct tlb_inv_context *cxt)
+{
+	__load_host_stage2();
+
+	if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
+		/* Ensure write of the host VMID */
+		isb();
+		/* Restore the host's TCR_EL1 */
+		write_sysreg_el1(cxt->tcr, SYS_TCR);
+	}
+}
+
+void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu,
+			      phys_addr_t ipa, int level)
+{
+	struct tlb_inv_context cxt;
+
+	dsb(ishst);
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest(mmu, &cxt);
+
+	/*
+	 * We could do so much better if we had the VA as well.
+	 * Instead, we invalidate Stage-2 for this IPA, and the
+	 * whole of Stage-1. Weep...
+	 */
+	ipa >>= 12;
+	__tlbi_level(ipas2e1is, ipa, level);
+
+	/*
+	 * We have to ensure completion of the invalidation at Stage-2,
+	 * since a table walk on another CPU could refill a TLB with a
+	 * complete (S1 + S2) walk based on the old Stage-2 mapping if
+	 * the Stage-1 invalidation happened first.
+	 */
+	dsb(ish);
+	__tlbi(vmalle1is);
+	dsb(ish);
+	isb();
+
+	/*
+	 * If the host is running at EL1 and we have a VPIPT I-cache,
+	 * then we must perform I-cache maintenance at EL2 in order for
+	 * it to have an effect on the guest. Since the guest cannot hit
+	 * I-cache lines allocated with a different VMID, we don't need
+	 * to worry about junk out of guest reset (we nuke the I-cache on
+	 * VMID rollover), but we do need to be careful when remapping
+	 * executable pages for the same guest. This can happen when KSM
+	 * takes a CoW fault on an executable page, copies the page into
+	 * a page that was previously mapped in the guest and then needs
+	 * to invalidate the guest view of the I-cache for that page
+	 * from EL1. To solve this, we invalidate the entire I-cache when
+	 * unmapping a page from a guest if we have a VPIPT I-cache but
+	 * the host is running at EL1. As above, we could do better if
+	 * we had the VA.
+	 *
+	 * The moral of this story is: if you have a VPIPT I-cache, then
+	 * you should be running with VHE enabled.
+	 */
+	if (icache_is_vpipt())
+		icache_inval_all_pou();
+
+	__tlb_switch_to_host(&cxt);
+}
+
+void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu)
+{
+	struct tlb_inv_context cxt;
+
+	dsb(ishst);
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest(mmu, &cxt);
+
+	__tlbi(vmalls12e1is);
+	dsb(ish);
+	isb();
+
+	__tlb_switch_to_host(&cxt);
+}
+
+void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu)
+{
+	struct tlb_inv_context cxt;
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest(mmu, &cxt);
+
+	__tlbi(vmalle1);
+	asm volatile("ic iallu");
+	dsb(nsh);
+	isb();
+
+	__tlb_switch_to_host(&cxt);
+}
+
+void __kvm_flush_vm_context(void)
+{
+	dsb(ishst);
+	__tlbi(alle1is);
+
+	/*
+	 * VIPT and PIPT caches are not affected by VMID, so no maintenance
+	 * is necessary across a VMID rollover.
+	 *
+	 * VPIPT caches constrain lookup and maintenance to the active VMID,
+	 * so we need to invalidate lines with a stale VMID to avoid an ABA
+	 * race after multiple rollovers.
+	 *
+	 */
+	if (icache_is_vpipt())
+		asm volatile("ic ialluis");
+
+	dsb(ish);
+}
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
new file mode 100644
index 000000000..ae5f6b5ac
--- /dev/null
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -0,0 +1,1245 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Stand-alone page-table allocator for hyp stage-1 and guest stage-2.
+ * No bombay mix was harmed in the writing of this file.
+ *
+ * Copyright (C) 2020 Google LLC
+ * Author: Will Deacon <will@kernel.org>
+ */
+
+#include <linux/bitfield.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/stage2_pgtable.h>
+
+
+#define KVM_PTE_TYPE			BIT(1)
+#define KVM_PTE_TYPE_BLOCK		0
+#define KVM_PTE_TYPE_PAGE		1
+#define KVM_PTE_TYPE_TABLE		1
+
+#define KVM_PTE_LEAF_ATTR_LO		GENMASK(11, 2)
+
+#define KVM_PTE_LEAF_ATTR_LO_S1_ATTRIDX	GENMASK(4, 2)
+#define KVM_PTE_LEAF_ATTR_LO_S1_AP	GENMASK(7, 6)
+#define KVM_PTE_LEAF_ATTR_LO_S1_AP_RO	3
+#define KVM_PTE_LEAF_ATTR_LO_S1_AP_RW	1
+#define KVM_PTE_LEAF_ATTR_LO_S1_SH	GENMASK(9, 8)
+#define KVM_PTE_LEAF_ATTR_LO_S1_SH_IS	3
+#define KVM_PTE_LEAF_ATTR_LO_S1_AF	BIT(10)
+
+#define KVM_PTE_LEAF_ATTR_LO_S2_MEMATTR	GENMASK(5, 2)
+#define KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R	BIT(6)
+#define KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W	BIT(7)
+#define KVM_PTE_LEAF_ATTR_LO_S2_SH	GENMASK(9, 8)
+#define KVM_PTE_LEAF_ATTR_LO_S2_SH_IS	3
+#define KVM_PTE_LEAF_ATTR_LO_S2_AF	BIT(10)
+
+#define KVM_PTE_LEAF_ATTR_HI		GENMASK(63, 51)
+
+#define KVM_PTE_LEAF_ATTR_HI_SW		GENMASK(58, 55)
+
+#define KVM_PTE_LEAF_ATTR_HI_S1_XN	BIT(54)
+
+#define KVM_PTE_LEAF_ATTR_HI_S2_XN	BIT(54)
+
+#define KVM_PTE_LEAF_ATTR_S2_PERMS	(KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R | \
+					 KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | \
+					 KVM_PTE_LEAF_ATTR_HI_S2_XN)
+
+#define KVM_INVALID_PTE_OWNER_MASK	GENMASK(9, 2)
+#define KVM_MAX_OWNER_ID		1
+
+struct kvm_pgtable_walk_data {
+	struct kvm_pgtable		*pgt;
+	struct kvm_pgtable_walker	*walker;
+
+	u64				addr;
+	u64				end;
+};
+
+#define KVM_PHYS_INVALID (-1ULL)
+
+static bool kvm_phys_is_valid(u64 phys)
+{
+	return phys < BIT(id_aa64mmfr0_parange_to_phys_shift(ID_AA64MMFR0_EL1_PARANGE_MAX));
+}
+
+static bool kvm_block_mapping_supported(u64 addr, u64 end, u64 phys, u32 level)
+{
+	u64 granule = kvm_granule_size(level);
+
+	if (!kvm_level_supports_block_mapping(level))
+		return false;
+
+	if (granule > (end - addr))
+		return false;
+
+	if (kvm_phys_is_valid(phys) && !IS_ALIGNED(phys, granule))
+		return false;
+
+	return IS_ALIGNED(addr, granule);
+}
+
+static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, u32 level)
+{
+	u64 shift = kvm_granule_shift(level);
+	u64 mask = BIT(PAGE_SHIFT - 3) - 1;
+
+	return (data->addr >> shift) & mask;
+}
+
+static u32 __kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr)
+{
+	u64 shift = kvm_granule_shift(pgt->start_level - 1); /* May underflow */
+	u64 mask = BIT(pgt->ia_bits) - 1;
+
+	return (addr & mask) >> shift;
+}
+
+static u32 kvm_pgd_page_idx(struct kvm_pgtable_walk_data *data)
+{
+	return __kvm_pgd_page_idx(data->pgt, data->addr);
+}
+
+static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
+{
+	struct kvm_pgtable pgt = {
+		.ia_bits	= ia_bits,
+		.start_level	= start_level,
+	};
+
+	return __kvm_pgd_page_idx(&pgt, -1ULL) + 1;
+}
+
+static bool kvm_pte_table(kvm_pte_t pte, u32 level)
+{
+	if (level == KVM_PGTABLE_MAX_LEVELS - 1)
+		return false;
+
+	if (!kvm_pte_valid(pte))
+		return false;
+
+	return FIELD_GET(KVM_PTE_TYPE, pte) == KVM_PTE_TYPE_TABLE;
+}
+
+static kvm_pte_t kvm_phys_to_pte(u64 pa)
+{
+	kvm_pte_t pte = pa & KVM_PTE_ADDR_MASK;
+
+	if (PAGE_SHIFT == 16)
+		pte |= FIELD_PREP(KVM_PTE_ADDR_51_48, pa >> 48);
+
+	return pte;
+}
+
+static kvm_pte_t *kvm_pte_follow(kvm_pte_t pte, struct kvm_pgtable_mm_ops *mm_ops)
+{
+	return mm_ops->phys_to_virt(kvm_pte_to_phys(pte));
+}
+
+static void kvm_clear_pte(kvm_pte_t *ptep)
+{
+	WRITE_ONCE(*ptep, 0);
+}
+
+static void kvm_set_table_pte(kvm_pte_t *ptep, kvm_pte_t *childp,
+			      struct kvm_pgtable_mm_ops *mm_ops)
+{
+	kvm_pte_t old = *ptep, pte = kvm_phys_to_pte(mm_ops->virt_to_phys(childp));
+
+	pte |= FIELD_PREP(KVM_PTE_TYPE, KVM_PTE_TYPE_TABLE);
+	pte |= KVM_PTE_VALID;
+
+	WARN_ON(kvm_pte_valid(old));
+	smp_store_release(ptep, pte);
+}
+
+static kvm_pte_t kvm_init_valid_leaf_pte(u64 pa, kvm_pte_t attr, u32 level)
+{
+	kvm_pte_t pte = kvm_phys_to_pte(pa);
+	u64 type = (level == KVM_PGTABLE_MAX_LEVELS - 1) ? KVM_PTE_TYPE_PAGE :
+							   KVM_PTE_TYPE_BLOCK;
+
+	pte |= attr & (KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI);
+	pte |= FIELD_PREP(KVM_PTE_TYPE, type);
+	pte |= KVM_PTE_VALID;
+
+	return pte;
+}
+
+static kvm_pte_t kvm_init_invalid_leaf_owner(u8 owner_id)
+{
+	return FIELD_PREP(KVM_INVALID_PTE_OWNER_MASK, owner_id);
+}
+
+static int kvm_pgtable_visitor_cb(struct kvm_pgtable_walk_data *data, u64 addr,
+				  u32 level, kvm_pte_t *ptep,
+				  enum kvm_pgtable_walk_flags flag)
+{
+	struct kvm_pgtable_walker *walker = data->walker;
+	return walker->cb(addr, data->end, level, ptep, flag, walker->arg);
+}
+
+static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
+			      kvm_pte_t *pgtable, u32 level);
+
+static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
+				      kvm_pte_t *ptep, u32 level)
+{
+	int ret = 0;
+	u64 addr = data->addr;
+	kvm_pte_t *childp, pte = *ptep;
+	bool table = kvm_pte_table(pte, level);
+	enum kvm_pgtable_walk_flags flags = data->walker->flags;
+
+	if (table && (flags & KVM_PGTABLE_WALK_TABLE_PRE)) {
+		ret = kvm_pgtable_visitor_cb(data, addr, level, ptep,
+					     KVM_PGTABLE_WALK_TABLE_PRE);
+	}
+
+	if (!table && (flags & KVM_PGTABLE_WALK_LEAF)) {
+		ret = kvm_pgtable_visitor_cb(data, addr, level, ptep,
+					     KVM_PGTABLE_WALK_LEAF);
+		pte = *ptep;
+		table = kvm_pte_table(pte, level);
+	}
+
+	if (ret)
+		goto out;
+
+	if (!table) {
+		data->addr = ALIGN_DOWN(data->addr, kvm_granule_size(level));
+		data->addr += kvm_granule_size(level);
+		goto out;
+	}
+
+	childp = kvm_pte_follow(pte, data->pgt->mm_ops);
+	ret = __kvm_pgtable_walk(data, childp, level + 1);
+	if (ret)
+		goto out;
+
+	if (flags & KVM_PGTABLE_WALK_TABLE_POST) {
+		ret = kvm_pgtable_visitor_cb(data, addr, level, ptep,
+					     KVM_PGTABLE_WALK_TABLE_POST);
+	}
+
+out:
+	return ret;
+}
+
+static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
+			      kvm_pte_t *pgtable, u32 level)
+{
+	u32 idx;
+	int ret = 0;
+
+	if (WARN_ON_ONCE(level >= KVM_PGTABLE_MAX_LEVELS))
+		return -EINVAL;
+
+	for (idx = kvm_pgtable_idx(data, level); idx < PTRS_PER_PTE; ++idx) {
+		kvm_pte_t *ptep = &pgtable[idx];
+
+		if (data->addr >= data->end)
+			break;
+
+		ret = __kvm_pgtable_visit(data, ptep, level);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int _kvm_pgtable_walk(struct kvm_pgtable_walk_data *data)
+{
+	u32 idx;
+	int ret = 0;
+	struct kvm_pgtable *pgt = data->pgt;
+	u64 limit = BIT(pgt->ia_bits);
+
+	if (data->addr > limit || data->end > limit)
+		return -ERANGE;
+
+	if (!pgt->pgd)
+		return -EINVAL;
+
+	for (idx = kvm_pgd_page_idx(data); data->addr < data->end; ++idx) {
+		kvm_pte_t *ptep = &pgt->pgd[idx * PTRS_PER_PTE];
+
+		ret = __kvm_pgtable_walk(data, ptep, pgt->start_level);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
+		     struct kvm_pgtable_walker *walker)
+{
+	struct kvm_pgtable_walk_data walk_data = {
+		.pgt	= pgt,
+		.addr	= ALIGN_DOWN(addr, PAGE_SIZE),
+		.end	= PAGE_ALIGN(walk_data.addr + size),
+		.walker	= walker,
+	};
+
+	return _kvm_pgtable_walk(&walk_data);
+}
+
+struct leaf_walk_data {
+	kvm_pte_t	pte;
+	u32		level;
+};
+
+static int leaf_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+		       enum kvm_pgtable_walk_flags flag, void * const arg)
+{
+	struct leaf_walk_data *data = arg;
+
+	data->pte   = *ptep;
+	data->level = level;
+
+	return 0;
+}
+
+int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
+			 kvm_pte_t *ptep, u32 *level)
+{
+	struct leaf_walk_data data;
+	struct kvm_pgtable_walker walker = {
+		.cb	= leaf_walker,
+		.flags	= KVM_PGTABLE_WALK_LEAF,
+		.arg	= &data,
+	};
+	int ret;
+
+	ret = kvm_pgtable_walk(pgt, ALIGN_DOWN(addr, PAGE_SIZE),
+			       PAGE_SIZE, &walker);
+	if (!ret) {
+		if (ptep)
+			*ptep  = data.pte;
+		if (level)
+			*level = data.level;
+	}
+
+	return ret;
+}
+
+struct hyp_map_data {
+	u64				phys;
+	kvm_pte_t			attr;
+	struct kvm_pgtable_mm_ops	*mm_ops;
+};
+
+static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
+{
+	bool device = prot & KVM_PGTABLE_PROT_DEVICE;
+	u32 mtype = device ? MT_DEVICE_nGnRE : MT_NORMAL;
+	kvm_pte_t attr = FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_ATTRIDX, mtype);
+	u32 sh = KVM_PTE_LEAF_ATTR_LO_S1_SH_IS;
+	u32 ap = (prot & KVM_PGTABLE_PROT_W) ? KVM_PTE_LEAF_ATTR_LO_S1_AP_RW :
+					       KVM_PTE_LEAF_ATTR_LO_S1_AP_RO;
+
+	if (!(prot & KVM_PGTABLE_PROT_R))
+		return -EINVAL;
+
+	if (prot & KVM_PGTABLE_PROT_X) {
+		if (prot & KVM_PGTABLE_PROT_W)
+			return -EINVAL;
+
+		if (device)
+			return -EINVAL;
+	} else {
+		attr |= KVM_PTE_LEAF_ATTR_HI_S1_XN;
+	}
+
+	attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_AP, ap);
+	attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_SH, sh);
+	attr |= KVM_PTE_LEAF_ATTR_LO_S1_AF;
+	attr |= prot & KVM_PTE_LEAF_ATTR_HI_SW;
+	*ptep = attr;
+
+	return 0;
+}
+
+enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte)
+{
+	enum kvm_pgtable_prot prot = pte & KVM_PTE_LEAF_ATTR_HI_SW;
+	u32 ap;
+
+	if (!kvm_pte_valid(pte))
+		return prot;
+
+	if (!(pte & KVM_PTE_LEAF_ATTR_HI_S1_XN))
+		prot |= KVM_PGTABLE_PROT_X;
+
+	ap = FIELD_GET(KVM_PTE_LEAF_ATTR_LO_S1_AP, pte);
+	if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RO)
+		prot |= KVM_PGTABLE_PROT_R;
+	else if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RW)
+		prot |= KVM_PGTABLE_PROT_RW;
+
+	return prot;
+}
+
+static bool hyp_map_walker_try_leaf(u64 addr, u64 end, u32 level,
+				    kvm_pte_t *ptep, struct hyp_map_data *data)
+{
+	kvm_pte_t new, old = *ptep;
+	u64 granule = kvm_granule_size(level), phys = data->phys;
+
+	if (!kvm_block_mapping_supported(addr, end, phys, level))
+		return false;
+
+	data->phys += granule;
+	new = kvm_init_valid_leaf_pte(phys, data->attr, level);
+	if (old == new)
+		return true;
+	if (!kvm_pte_valid(old))
+		data->mm_ops->get_page(ptep);
+	else if (WARN_ON((old ^ new) & ~KVM_PTE_LEAF_ATTR_HI_SW))
+		return false;
+
+	smp_store_release(ptep, new);
+	return true;
+}
+
+static int hyp_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			  enum kvm_pgtable_walk_flags flag, void * const arg)
+{
+	kvm_pte_t *childp;
+	struct hyp_map_data *data = arg;
+	struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+
+	if (hyp_map_walker_try_leaf(addr, end, level, ptep, arg))
+		return 0;
+
+	if (WARN_ON(level == KVM_PGTABLE_MAX_LEVELS - 1))
+		return -EINVAL;
+
+	childp = (kvm_pte_t *)mm_ops->zalloc_page(NULL);
+	if (!childp)
+		return -ENOMEM;
+
+	kvm_set_table_pte(ptep, childp, mm_ops);
+	mm_ops->get_page(ptep);
+	return 0;
+}
+
+int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys,
+			enum kvm_pgtable_prot prot)
+{
+	int ret;
+	struct hyp_map_data map_data = {
+		.phys	= ALIGN_DOWN(phys, PAGE_SIZE),
+		.mm_ops	= pgt->mm_ops,
+	};
+	struct kvm_pgtable_walker walker = {
+		.cb	= hyp_map_walker,
+		.flags	= KVM_PGTABLE_WALK_LEAF,
+		.arg	= &map_data,
+	};
+
+	ret = hyp_set_prot_attr(prot, &map_data.attr);
+	if (ret)
+		return ret;
+
+	ret = kvm_pgtable_walk(pgt, addr, size, &walker);
+	dsb(ishst);
+	isb();
+	return ret;
+}
+
+struct hyp_unmap_data {
+	u64				unmapped;
+	struct kvm_pgtable_mm_ops	*mm_ops;
+};
+
+static int hyp_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			    enum kvm_pgtable_walk_flags flag, void * const arg)
+{
+	kvm_pte_t pte = *ptep, *childp = NULL;
+	u64 granule = kvm_granule_size(level);
+	struct hyp_unmap_data *data = arg;
+	struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+
+	if (!kvm_pte_valid(pte))
+		return -EINVAL;
+
+	if (kvm_pte_table(pte, level)) {
+		childp = kvm_pte_follow(pte, mm_ops);
+
+		if (mm_ops->page_count(childp) != 1)
+			return 0;
+
+		kvm_clear_pte(ptep);
+		dsb(ishst);
+		__tlbi_level(vae2is, __TLBI_VADDR(addr, 0), level);
+	} else {
+		if (end - addr < granule)
+			return -EINVAL;
+
+		kvm_clear_pte(ptep);
+		dsb(ishst);
+		__tlbi_level(vale2is, __TLBI_VADDR(addr, 0), level);
+		data->unmapped += granule;
+	}
+
+	dsb(ish);
+	isb();
+	mm_ops->put_page(ptep);
+
+	if (childp)
+		mm_ops->put_page(childp);
+
+	return 0;
+}
+
+u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+	struct hyp_unmap_data unmap_data = {
+		.mm_ops	= pgt->mm_ops,
+	};
+	struct kvm_pgtable_walker walker = {
+		.cb	= hyp_unmap_walker,
+		.arg	= &unmap_data,
+		.flags	= KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
+	};
+
+	if (!pgt->mm_ops->page_count)
+		return 0;
+
+	kvm_pgtable_walk(pgt, addr, size, &walker);
+	return unmap_data.unmapped;
+}
+
+int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits,
+			 struct kvm_pgtable_mm_ops *mm_ops)
+{
+	u64 levels = ARM64_HW_PGTABLE_LEVELS(va_bits);
+
+	pgt->pgd = (kvm_pte_t *)mm_ops->zalloc_page(NULL);
+	if (!pgt->pgd)
+		return -ENOMEM;
+
+	pgt->ia_bits		= va_bits;
+	pgt->start_level	= KVM_PGTABLE_MAX_LEVELS - levels;
+	pgt->mm_ops		= mm_ops;
+	pgt->mmu		= NULL;
+	pgt->force_pte_cb	= NULL;
+
+	return 0;
+}
+
+static int hyp_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			   enum kvm_pgtable_walk_flags flag, void * const arg)
+{
+	struct kvm_pgtable_mm_ops *mm_ops = arg;
+	kvm_pte_t pte = *ptep;
+
+	if (!kvm_pte_valid(pte))
+		return 0;
+
+	mm_ops->put_page(ptep);
+
+	if (kvm_pte_table(pte, level))
+		mm_ops->put_page(kvm_pte_follow(pte, mm_ops));
+
+	return 0;
+}
+
+void kvm_pgtable_hyp_destroy(struct kvm_pgtable *pgt)
+{
+	struct kvm_pgtable_walker walker = {
+		.cb	= hyp_free_walker,
+		.flags	= KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
+		.arg	= pgt->mm_ops,
+	};
+
+	WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker));
+	pgt->mm_ops->put_page(pgt->pgd);
+	pgt->pgd = NULL;
+}
+
+struct stage2_map_data {
+	u64				phys;
+	kvm_pte_t			attr;
+	u8				owner_id;
+
+	kvm_pte_t			*anchor;
+	kvm_pte_t			*childp;
+
+	struct kvm_s2_mmu		*mmu;
+	void				*memcache;
+
+	struct kvm_pgtable_mm_ops	*mm_ops;
+
+	/* Force mappings to page granularity */
+	bool				force_pte;
+};
+
+u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
+{
+	u64 vtcr = VTCR_EL2_FLAGS;
+	u8 lvls;
+
+	vtcr |= kvm_get_parange(mmfr0) << VTCR_EL2_PS_SHIFT;
+	vtcr |= VTCR_EL2_T0SZ(phys_shift);
+	/*
+	 * Use a minimum 2 level page table to prevent splitting
+	 * host PMD huge pages at stage2.
+	 */
+	lvls = stage2_pgtable_levels(phys_shift);
+	if (lvls < 2)
+		lvls = 2;
+	vtcr |= VTCR_EL2_LVLS_TO_SL0(lvls);
+
+#ifdef CONFIG_ARM64_HW_AFDBM
+	/*
+	 * Enable the Hardware Access Flag management, unconditionally
+	 * on all CPUs. In systems that have asymmetric support for the feature
+	 * this allows KVM to leverage hardware support on the subset of cores
+	 * that implement the feature.
+	 *
+	 * The architecture requires VTCR_EL2.HA to be RES0 (thus ignored by
+	 * hardware) on implementations that do not advertise support for the
+	 * feature. As such, setting HA unconditionally is safe, unless you
+	 * happen to be running on a design that has unadvertised support for
+	 * HAFDBS. Here be dragons.
+	 */
+	if (!cpus_have_final_cap(ARM64_WORKAROUND_AMPERE_AC03_CPU_38))
+		vtcr |= VTCR_EL2_HA;
+#endif /* CONFIG_ARM64_HW_AFDBM */
+
+	/* Set the vmid bits */
+	vtcr |= (get_vmid_bits(mmfr1) == 16) ?
+		VTCR_EL2_VS_16BIT :
+		VTCR_EL2_VS_8BIT;
+
+	return vtcr;
+}
+
+static bool stage2_has_fwb(struct kvm_pgtable *pgt)
+{
+	if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
+		return false;
+
+	return !(pgt->flags & KVM_PGTABLE_S2_NOFWB);
+}
+
+#define KVM_S2_MEMATTR(pgt, attr) PAGE_S2_MEMATTR(attr, stage2_has_fwb(pgt))
+
+static int stage2_set_prot_attr(struct kvm_pgtable *pgt, enum kvm_pgtable_prot prot,
+				kvm_pte_t *ptep)
+{
+	bool device = prot & KVM_PGTABLE_PROT_DEVICE;
+	kvm_pte_t attr = device ? KVM_S2_MEMATTR(pgt, DEVICE_nGnRE) :
+			    KVM_S2_MEMATTR(pgt, NORMAL);
+	u32 sh = KVM_PTE_LEAF_ATTR_LO_S2_SH_IS;
+
+	if (!(prot & KVM_PGTABLE_PROT_X))
+		attr |= KVM_PTE_LEAF_ATTR_HI_S2_XN;
+	else if (device)
+		return -EINVAL;
+
+	if (prot & KVM_PGTABLE_PROT_R)
+		attr |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R;
+
+	if (prot & KVM_PGTABLE_PROT_W)
+		attr |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W;
+
+	attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S2_SH, sh);
+	attr |= KVM_PTE_LEAF_ATTR_LO_S2_AF;
+	attr |= prot & KVM_PTE_LEAF_ATTR_HI_SW;
+	*ptep = attr;
+
+	return 0;
+}
+
+enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte)
+{
+	enum kvm_pgtable_prot prot = pte & KVM_PTE_LEAF_ATTR_HI_SW;
+
+	if (!kvm_pte_valid(pte))
+		return prot;
+
+	if (pte & KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R)
+		prot |= KVM_PGTABLE_PROT_R;
+	if (pte & KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W)
+		prot |= KVM_PGTABLE_PROT_W;
+	if (!(pte & KVM_PTE_LEAF_ATTR_HI_S2_XN))
+		prot |= KVM_PGTABLE_PROT_X;
+
+	return prot;
+}
+
+static bool stage2_pte_needs_update(kvm_pte_t old, kvm_pte_t new)
+{
+	if (!kvm_pte_valid(old) || !kvm_pte_valid(new))
+		return true;
+
+	return ((old ^ new) & (~KVM_PTE_LEAF_ATTR_S2_PERMS));
+}
+
+static bool stage2_pte_is_counted(kvm_pte_t pte)
+{
+	/*
+	 * The refcount tracks valid entries as well as invalid entries if they
+	 * encode ownership of a page to another entity than the page-table
+	 * owner, whose id is 0.
+	 */
+	return !!pte;
+}
+
+static void stage2_put_pte(kvm_pte_t *ptep, struct kvm_s2_mmu *mmu, u64 addr,
+			   u32 level, struct kvm_pgtable_mm_ops *mm_ops)
+{
+	/*
+	 * Clear the existing PTE, and perform break-before-make with
+	 * TLB maintenance if it was valid.
+	 */
+	if (kvm_pte_valid(*ptep)) {
+		kvm_clear_pte(ptep);
+		kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, addr, level);
+	}
+
+	mm_ops->put_page(ptep);
+}
+
+static bool stage2_pte_cacheable(struct kvm_pgtable *pgt, kvm_pte_t pte)
+{
+	u64 memattr = pte & KVM_PTE_LEAF_ATTR_LO_S2_MEMATTR;
+	return memattr == KVM_S2_MEMATTR(pgt, NORMAL);
+}
+
+static bool stage2_pte_executable(kvm_pte_t pte)
+{
+	return !(pte & KVM_PTE_LEAF_ATTR_HI_S2_XN);
+}
+
+static bool stage2_leaf_mapping_allowed(u64 addr, u64 end, u32 level,
+					struct stage2_map_data *data)
+{
+	if (data->force_pte && (level < (KVM_PGTABLE_MAX_LEVELS - 1)))
+		return false;
+
+	return kvm_block_mapping_supported(addr, end, data->phys, level);
+}
+
+static int stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level,
+				      kvm_pte_t *ptep,
+				      struct stage2_map_data *data)
+{
+	kvm_pte_t new, old = *ptep;
+	u64 granule = kvm_granule_size(level), phys = data->phys;
+	struct kvm_pgtable *pgt = data->mmu->pgt;
+	struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+
+	if (!stage2_leaf_mapping_allowed(addr, end, level, data))
+		return -E2BIG;
+
+	if (kvm_phys_is_valid(phys))
+		new = kvm_init_valid_leaf_pte(phys, data->attr, level);
+	else
+		new = kvm_init_invalid_leaf_owner(data->owner_id);
+
+	if (stage2_pte_is_counted(old)) {
+		/*
+		 * Skip updating the PTE if we are trying to recreate the exact
+		 * same mapping or only change the access permissions. Instead,
+		 * the vCPU will exit one more time from guest if still needed
+		 * and then go through the path of relaxing permissions.
+		 */
+		if (!stage2_pte_needs_update(old, new))
+			return -EAGAIN;
+
+		stage2_put_pte(ptep, data->mmu, addr, level, mm_ops);
+	}
+
+	/* Perform CMOs before installation of the guest stage-2 PTE */
+	if (mm_ops->dcache_clean_inval_poc && stage2_pte_cacheable(pgt, new))
+		mm_ops->dcache_clean_inval_poc(kvm_pte_follow(new, mm_ops),
+						granule);
+
+	if (mm_ops->icache_inval_pou && stage2_pte_executable(new))
+		mm_ops->icache_inval_pou(kvm_pte_follow(new, mm_ops), granule);
+
+	smp_store_release(ptep, new);
+	if (stage2_pte_is_counted(new))
+		mm_ops->get_page(ptep);
+	if (kvm_phys_is_valid(phys))
+		data->phys += granule;
+	return 0;
+}
+
+static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
+				     kvm_pte_t *ptep,
+				     struct stage2_map_data *data)
+{
+	if (data->anchor)
+		return 0;
+
+	if (!stage2_leaf_mapping_allowed(addr, end, level, data))
+		return 0;
+
+	data->childp = kvm_pte_follow(*ptep, data->mm_ops);
+	kvm_clear_pte(ptep);
+
+	/*
+	 * Invalidate the whole stage-2, as we may have numerous leaf
+	 * entries below us which would otherwise need invalidating
+	 * individually.
+	 */
+	kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu);
+	data->anchor = ptep;
+	return 0;
+}
+
+static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+				struct stage2_map_data *data)
+{
+	struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+	kvm_pte_t *childp, pte = *ptep;
+	int ret;
+
+	if (data->anchor) {
+		if (stage2_pte_is_counted(pte))
+			mm_ops->put_page(ptep);
+
+		return 0;
+	}
+
+	ret = stage2_map_walker_try_leaf(addr, end, level, ptep, data);
+	if (ret != -E2BIG)
+		return ret;
+
+	if (WARN_ON(level == KVM_PGTABLE_MAX_LEVELS - 1))
+		return -EINVAL;
+
+	if (!data->memcache)
+		return -ENOMEM;
+
+	childp = mm_ops->zalloc_page(data->memcache);
+	if (!childp)
+		return -ENOMEM;
+
+	/*
+	 * If we've run into an existing block mapping then replace it with
+	 * a table. Accesses beyond 'end' that fall within the new table
+	 * will be mapped lazily.
+	 */
+	if (stage2_pte_is_counted(pte))
+		stage2_put_pte(ptep, data->mmu, addr, level, mm_ops);
+
+	kvm_set_table_pte(ptep, childp, mm_ops);
+	mm_ops->get_page(ptep);
+
+	return 0;
+}
+
+static int stage2_map_walk_table_post(u64 addr, u64 end, u32 level,
+				      kvm_pte_t *ptep,
+				      struct stage2_map_data *data)
+{
+	struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+	kvm_pte_t *childp;
+	int ret = 0;
+
+	if (!data->anchor)
+		return 0;
+
+	if (data->anchor == ptep) {
+		childp = data->childp;
+		data->anchor = NULL;
+		data->childp = NULL;
+		ret = stage2_map_walk_leaf(addr, end, level, ptep, data);
+	} else {
+		childp = kvm_pte_follow(*ptep, mm_ops);
+	}
+
+	mm_ops->put_page(childp);
+	mm_ops->put_page(ptep);
+
+	return ret;
+}
+
+/*
+ * This is a little fiddly, as we use all three of the walk flags. The idea
+ * is that the TABLE_PRE callback runs for table entries on the way down,
+ * looking for table entries which we could conceivably replace with a
+ * block entry for this mapping. If it finds one, then it sets the 'anchor'
+ * field in 'struct stage2_map_data' to point at the table entry, before
+ * clearing the entry to zero and descending into the now detached table.
+ *
+ * The behaviour of the LEAF callback then depends on whether or not the
+ * anchor has been set. If not, then we're not using a block mapping higher
+ * up the table and we perform the mapping at the existing leaves instead.
+ * If, on the other hand, the anchor _is_ set, then we drop references to
+ * all valid leaves so that the pages beneath the anchor can be freed.
+ *
+ * Finally, the TABLE_POST callback does nothing if the anchor has not
+ * been set, but otherwise frees the page-table pages while walking back up
+ * the page-table, installing the block entry when it revisits the anchor
+ * pointer and clearing the anchor to NULL.
+ */
+static int stage2_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			     enum kvm_pgtable_walk_flags flag, void * const arg)
+{
+	struct stage2_map_data *data = arg;
+
+	switch (flag) {
+	case KVM_PGTABLE_WALK_TABLE_PRE:
+		return stage2_map_walk_table_pre(addr, end, level, ptep, data);
+	case KVM_PGTABLE_WALK_LEAF:
+		return stage2_map_walk_leaf(addr, end, level, ptep, data);
+	case KVM_PGTABLE_WALK_TABLE_POST:
+		return stage2_map_walk_table_post(addr, end, level, ptep, data);
+	}
+
+	return -EINVAL;
+}
+
+int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
+			   u64 phys, enum kvm_pgtable_prot prot,
+			   void *mc)
+{
+	int ret;
+	struct stage2_map_data map_data = {
+		.phys		= ALIGN_DOWN(phys, PAGE_SIZE),
+		.mmu		= pgt->mmu,
+		.memcache	= mc,
+		.mm_ops		= pgt->mm_ops,
+		.force_pte	= pgt->force_pte_cb && pgt->force_pte_cb(addr, addr + size, prot),
+	};
+	struct kvm_pgtable_walker walker = {
+		.cb		= stage2_map_walker,
+		.flags		= KVM_PGTABLE_WALK_TABLE_PRE |
+				  KVM_PGTABLE_WALK_LEAF |
+				  KVM_PGTABLE_WALK_TABLE_POST,
+		.arg		= &map_data,
+	};
+
+	if (WARN_ON((pgt->flags & KVM_PGTABLE_S2_IDMAP) && (addr != phys)))
+		return -EINVAL;
+
+	ret = stage2_set_prot_attr(pgt, prot, &map_data.attr);
+	if (ret)
+		return ret;
+
+	ret = kvm_pgtable_walk(pgt, addr, size, &walker);
+	dsb(ishst);
+	return ret;
+}
+
+int kvm_pgtable_stage2_set_owner(struct kvm_pgtable *pgt, u64 addr, u64 size,
+				 void *mc, u8 owner_id)
+{
+	int ret;
+	struct stage2_map_data map_data = {
+		.phys		= KVM_PHYS_INVALID,
+		.mmu		= pgt->mmu,
+		.memcache	= mc,
+		.mm_ops		= pgt->mm_ops,
+		.owner_id	= owner_id,
+		.force_pte	= true,
+	};
+	struct kvm_pgtable_walker walker = {
+		.cb		= stage2_map_walker,
+		.flags		= KVM_PGTABLE_WALK_TABLE_PRE |
+				  KVM_PGTABLE_WALK_LEAF |
+				  KVM_PGTABLE_WALK_TABLE_POST,
+		.arg		= &map_data,
+	};
+
+	if (owner_id > KVM_MAX_OWNER_ID)
+		return -EINVAL;
+
+	ret = kvm_pgtable_walk(pgt, addr, size, &walker);
+	return ret;
+}
+
+static int stage2_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			       enum kvm_pgtable_walk_flags flag,
+			       void * const arg)
+{
+	struct kvm_pgtable *pgt = arg;
+	struct kvm_s2_mmu *mmu = pgt->mmu;
+	struct kvm_pgtable_mm_ops *mm_ops = pgt->mm_ops;
+	kvm_pte_t pte = *ptep, *childp = NULL;
+	bool need_flush = false;
+
+	if (!kvm_pte_valid(pte)) {
+		if (stage2_pte_is_counted(pte)) {
+			kvm_clear_pte(ptep);
+			mm_ops->put_page(ptep);
+		}
+		return 0;
+	}
+
+	if (kvm_pte_table(pte, level)) {
+		childp = kvm_pte_follow(pte, mm_ops);
+
+		if (mm_ops->page_count(childp) != 1)
+			return 0;
+	} else if (stage2_pte_cacheable(pgt, pte)) {
+		need_flush = !stage2_has_fwb(pgt);
+	}
+
+	/*
+	 * This is similar to the map() path in that we unmap the entire
+	 * block entry and rely on the remaining portions being faulted
+	 * back lazily.
+	 */
+	stage2_put_pte(ptep, mmu, addr, level, mm_ops);
+
+	if (need_flush && mm_ops->dcache_clean_inval_poc)
+		mm_ops->dcache_clean_inval_poc(kvm_pte_follow(pte, mm_ops),
+					       kvm_granule_size(level));
+
+	if (childp)
+		mm_ops->put_page(childp);
+
+	return 0;
+}
+
+int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+	struct kvm_pgtable_walker walker = {
+		.cb	= stage2_unmap_walker,
+		.arg	= pgt,
+		.flags	= KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
+	};
+
+	return kvm_pgtable_walk(pgt, addr, size, &walker);
+}
+
+struct stage2_attr_data {
+	kvm_pte_t			attr_set;
+	kvm_pte_t			attr_clr;
+	kvm_pte_t			pte;
+	u32				level;
+	struct kvm_pgtable_mm_ops	*mm_ops;
+};
+
+static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			      enum kvm_pgtable_walk_flags flag,
+			      void * const arg)
+{
+	kvm_pte_t pte = *ptep;
+	struct stage2_attr_data *data = arg;
+	struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
+
+	if (!kvm_pte_valid(pte))
+		return 0;
+
+	data->level = level;
+	data->pte = pte;
+	pte &= ~data->attr_clr;
+	pte |= data->attr_set;
+
+	/*
+	 * We may race with the CPU trying to set the access flag here,
+	 * but worst-case the access flag update gets lost and will be
+	 * set on the next access instead.
+	 */
+	if (data->pte != pte) {
+		/*
+		 * Invalidate instruction cache before updating the guest
+		 * stage-2 PTE if we are going to add executable permission.
+		 */
+		if (mm_ops->icache_inval_pou &&
+		    stage2_pte_executable(pte) && !stage2_pte_executable(*ptep))
+			mm_ops->icache_inval_pou(kvm_pte_follow(pte, mm_ops),
+						  kvm_granule_size(level));
+		WRITE_ONCE(*ptep, pte);
+	}
+
+	return 0;
+}
+
+static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
+				    u64 size, kvm_pte_t attr_set,
+				    kvm_pte_t attr_clr, kvm_pte_t *orig_pte,
+				    u32 *level)
+{
+	int ret;
+	kvm_pte_t attr_mask = KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI;
+	struct stage2_attr_data data = {
+		.attr_set	= attr_set & attr_mask,
+		.attr_clr	= attr_clr & attr_mask,
+		.mm_ops		= pgt->mm_ops,
+	};
+	struct kvm_pgtable_walker walker = {
+		.cb		= stage2_attr_walker,
+		.arg		= &data,
+		.flags		= KVM_PGTABLE_WALK_LEAF,
+	};
+
+	ret = kvm_pgtable_walk(pgt, addr, size, &walker);
+	if (ret)
+		return ret;
+
+	if (orig_pte)
+		*orig_pte = data.pte;
+
+	if (level)
+		*level = data.level;
+	return 0;
+}
+
+int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+	return stage2_update_leaf_attrs(pgt, addr, size, 0,
+					KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W,
+					NULL, NULL);
+}
+
+kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr)
+{
+	kvm_pte_t pte = 0;
+	stage2_update_leaf_attrs(pgt, addr, 1, KVM_PTE_LEAF_ATTR_LO_S2_AF, 0,
+				 &pte, NULL);
+	dsb(ishst);
+	return pte;
+}
+
+kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr)
+{
+	kvm_pte_t pte = 0;
+	stage2_update_leaf_attrs(pgt, addr, 1, 0, KVM_PTE_LEAF_ATTR_LO_S2_AF,
+				 &pte, NULL);
+	/*
+	 * "But where's the TLBI?!", you scream.
+	 * "Over in the core code", I sigh.
+	 *
+	 * See the '->clear_flush_young()' callback on the KVM mmu notifier.
+	 */
+	return pte;
+}
+
+bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr)
+{
+	kvm_pte_t pte = 0;
+	stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL);
+	return pte & KVM_PTE_LEAF_ATTR_LO_S2_AF;
+}
+
+int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr,
+				   enum kvm_pgtable_prot prot)
+{
+	int ret;
+	u32 level;
+	kvm_pte_t set = 0, clr = 0;
+
+	if (prot & KVM_PTE_LEAF_ATTR_HI_SW)
+		return -EINVAL;
+
+	if (prot & KVM_PGTABLE_PROT_R)
+		set |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R;
+
+	if (prot & KVM_PGTABLE_PROT_W)
+		set |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W;
+
+	if (prot & KVM_PGTABLE_PROT_X)
+		clr |= KVM_PTE_LEAF_ATTR_HI_S2_XN;
+
+	ret = stage2_update_leaf_attrs(pgt, addr, 1, set, clr, NULL, &level);
+	if (!ret)
+		kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, pgt->mmu, addr, level);
+	return ret;
+}
+
+static int stage2_flush_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			       enum kvm_pgtable_walk_flags flag,
+			       void * const arg)
+{
+	struct kvm_pgtable *pgt = arg;
+	struct kvm_pgtable_mm_ops *mm_ops = pgt->mm_ops;
+	kvm_pte_t pte = *ptep;
+
+	if (!kvm_pte_valid(pte) || !stage2_pte_cacheable(pgt, pte))
+		return 0;
+
+	if (mm_ops->dcache_clean_inval_poc)
+		mm_ops->dcache_clean_inval_poc(kvm_pte_follow(pte, mm_ops),
+					       kvm_granule_size(level));
+	return 0;
+}
+
+int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
+{
+	struct kvm_pgtable_walker walker = {
+		.cb	= stage2_flush_walker,
+		.flags	= KVM_PGTABLE_WALK_LEAF,
+		.arg	= pgt,
+	};
+
+	if (stage2_has_fwb(pgt))
+		return 0;
+
+	return kvm_pgtable_walk(pgt, addr, size, &walker);
+}
+
+
+int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu,
+			      struct kvm_pgtable_mm_ops *mm_ops,
+			      enum kvm_pgtable_stage2_flags flags,
+			      kvm_pgtable_force_pte_cb_t force_pte_cb)
+{
+	size_t pgd_sz;
+	u64 vtcr = mmu->arch->vtcr;
+	u32 ia_bits = VTCR_EL2_IPA(vtcr);
+	u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr);
+	u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
+
+	pgd_sz = kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE;
+	pgt->pgd = mm_ops->zalloc_pages_exact(pgd_sz);
+	if (!pgt->pgd)
+		return -ENOMEM;
+
+	pgt->ia_bits		= ia_bits;
+	pgt->start_level	= start_level;
+	pgt->mm_ops		= mm_ops;
+	pgt->mmu		= mmu;
+	pgt->flags		= flags;
+	pgt->force_pte_cb	= force_pte_cb;
+
+	/* Ensure zeroed PGD pages are visible to the hardware walker */
+	dsb(ishst);
+	return 0;
+}
+
+static int stage2_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
+			      enum kvm_pgtable_walk_flags flag,
+			      void * const arg)
+{
+	struct kvm_pgtable_mm_ops *mm_ops = arg;
+	kvm_pte_t pte = *ptep;
+
+	if (!stage2_pte_is_counted(pte))
+		return 0;
+
+	mm_ops->put_page(ptep);
+
+	if (kvm_pte_table(pte, level))
+		mm_ops->put_page(kvm_pte_follow(pte, mm_ops));
+
+	return 0;
+}
+
+void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt)
+{
+	size_t pgd_sz;
+	struct kvm_pgtable_walker walker = {
+		.cb	= stage2_free_walker,
+		.flags	= KVM_PGTABLE_WALK_LEAF |
+			  KVM_PGTABLE_WALK_TABLE_POST,
+		.arg	= pgt->mm_ops,
+	};
+
+	WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker));
+	pgd_sz = kvm_pgd_pages(pgt->ia_bits, pgt->start_level) * PAGE_SIZE;
+	pgt->mm_ops->free_pages_exact(pgt->pgd, pgd_sz);
+	pgt->pgd = NULL;
+}
diff --git a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
new file mode 100644
index 000000000..87a54375b
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/adjust_pc.h>
+
+#include <linux/compiler.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/kvm_host.h>
+#include <linux/swab.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+static bool __is_be(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_mode_is_32bit(vcpu))
+		return !!(read_sysreg_el2(SYS_SPSR) & PSR_AA32_E_BIT);
+
+	return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE);
+}
+
+/*
+ * __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the
+ *				     guest.
+ *
+ * @vcpu: the offending vcpu
+ *
+ * Returns:
+ *  1: GICV access successfully performed
+ *  0: Not a GICV access
+ * -1: Illegal GICV access successfully performed
+ */
+int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = kern_hyp_va(vcpu->kvm);
+	struct vgic_dist *vgic = &kvm->arch.vgic;
+	phys_addr_t fault_ipa;
+	void __iomem *addr;
+	int rd;
+
+	/* Build the full address */
+	fault_ipa  = kvm_vcpu_get_fault_ipa(vcpu);
+	fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0);
+
+	/* If not for GICV, move on */
+	if (fault_ipa <  vgic->vgic_cpu_base ||
+	    fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE))
+		return 0;
+
+	/* Reject anything but a 32bit access */
+	if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32)) {
+		__kvm_skip_instr(vcpu);
+		return -1;
+	}
+
+	/* Not aligned? Don't bother */
+	if (fault_ipa & 3) {
+		__kvm_skip_instr(vcpu);
+		return -1;
+	}
+
+	rd = kvm_vcpu_dabt_get_rd(vcpu);
+	addr  = kvm_vgic_global_state.vcpu_hyp_va;
+	addr += fault_ipa - vgic->vgic_cpu_base;
+
+	if (kvm_vcpu_dabt_iswrite(vcpu)) {
+		u32 data = vcpu_get_reg(vcpu, rd);
+		if (__is_be(vcpu)) {
+			/* guest pre-swabbed data, undo this for writel() */
+			data = __kvm_swab32(data);
+		}
+		writel_relaxed(data, addr);
+	} else {
+		u32 data = readl_relaxed(addr);
+		if (__is_be(vcpu)) {
+			/* guest expects swabbed data */
+			data = __kvm_swab32(data);
+		}
+		vcpu_set_reg(vcpu, rd, data);
+	}
+
+	__kvm_skip_instr(vcpu);
+
+	return 1;
+}
diff --git a/arch/arm64/kvm/hyp/vgic-v3-sr.c b/arch/arm64/kvm/hyp/vgic-v3-sr.c
new file mode 100644
index 000000000..6cb638b18
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vgic-v3-sr.c
@@ -0,0 +1,1143 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/adjust_pc.h>
+
+#include <linux/compiler.h>
+#include <linux/irqchip/arm-gic-v3.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+
+#define vtr_to_max_lr_idx(v)		((v) & 0xf)
+#define vtr_to_nr_pre_bits(v)		((((u32)(v) >> 26) & 7) + 1)
+#define vtr_to_nr_apr_regs(v)		(1 << (vtr_to_nr_pre_bits(v) - 5))
+
+static u64 __gic_v3_get_lr(unsigned int lr)
+{
+	switch (lr & 0xf) {
+	case 0:
+		return read_gicreg(ICH_LR0_EL2);
+	case 1:
+		return read_gicreg(ICH_LR1_EL2);
+	case 2:
+		return read_gicreg(ICH_LR2_EL2);
+	case 3:
+		return read_gicreg(ICH_LR3_EL2);
+	case 4:
+		return read_gicreg(ICH_LR4_EL2);
+	case 5:
+		return read_gicreg(ICH_LR5_EL2);
+	case 6:
+		return read_gicreg(ICH_LR6_EL2);
+	case 7:
+		return read_gicreg(ICH_LR7_EL2);
+	case 8:
+		return read_gicreg(ICH_LR8_EL2);
+	case 9:
+		return read_gicreg(ICH_LR9_EL2);
+	case 10:
+		return read_gicreg(ICH_LR10_EL2);
+	case 11:
+		return read_gicreg(ICH_LR11_EL2);
+	case 12:
+		return read_gicreg(ICH_LR12_EL2);
+	case 13:
+		return read_gicreg(ICH_LR13_EL2);
+	case 14:
+		return read_gicreg(ICH_LR14_EL2);
+	case 15:
+		return read_gicreg(ICH_LR15_EL2);
+	}
+
+	unreachable();
+}
+
+static void __gic_v3_set_lr(u64 val, int lr)
+{
+	switch (lr & 0xf) {
+	case 0:
+		write_gicreg(val, ICH_LR0_EL2);
+		break;
+	case 1:
+		write_gicreg(val, ICH_LR1_EL2);
+		break;
+	case 2:
+		write_gicreg(val, ICH_LR2_EL2);
+		break;
+	case 3:
+		write_gicreg(val, ICH_LR3_EL2);
+		break;
+	case 4:
+		write_gicreg(val, ICH_LR4_EL2);
+		break;
+	case 5:
+		write_gicreg(val, ICH_LR5_EL2);
+		break;
+	case 6:
+		write_gicreg(val, ICH_LR6_EL2);
+		break;
+	case 7:
+		write_gicreg(val, ICH_LR7_EL2);
+		break;
+	case 8:
+		write_gicreg(val, ICH_LR8_EL2);
+		break;
+	case 9:
+		write_gicreg(val, ICH_LR9_EL2);
+		break;
+	case 10:
+		write_gicreg(val, ICH_LR10_EL2);
+		break;
+	case 11:
+		write_gicreg(val, ICH_LR11_EL2);
+		break;
+	case 12:
+		write_gicreg(val, ICH_LR12_EL2);
+		break;
+	case 13:
+		write_gicreg(val, ICH_LR13_EL2);
+		break;
+	case 14:
+		write_gicreg(val, ICH_LR14_EL2);
+		break;
+	case 15:
+		write_gicreg(val, ICH_LR15_EL2);
+		break;
+	}
+}
+
+static void __vgic_v3_write_ap0rn(u32 val, int n)
+{
+	switch (n) {
+	case 0:
+		write_gicreg(val, ICH_AP0R0_EL2);
+		break;
+	case 1:
+		write_gicreg(val, ICH_AP0R1_EL2);
+		break;
+	case 2:
+		write_gicreg(val, ICH_AP0R2_EL2);
+		break;
+	case 3:
+		write_gicreg(val, ICH_AP0R3_EL2);
+		break;
+	}
+}
+
+static void __vgic_v3_write_ap1rn(u32 val, int n)
+{
+	switch (n) {
+	case 0:
+		write_gicreg(val, ICH_AP1R0_EL2);
+		break;
+	case 1:
+		write_gicreg(val, ICH_AP1R1_EL2);
+		break;
+	case 2:
+		write_gicreg(val, ICH_AP1R2_EL2);
+		break;
+	case 3:
+		write_gicreg(val, ICH_AP1R3_EL2);
+		break;
+	}
+}
+
+static u32 __vgic_v3_read_ap0rn(int n)
+{
+	u32 val;
+
+	switch (n) {
+	case 0:
+		val = read_gicreg(ICH_AP0R0_EL2);
+		break;
+	case 1:
+		val = read_gicreg(ICH_AP0R1_EL2);
+		break;
+	case 2:
+		val = read_gicreg(ICH_AP0R2_EL2);
+		break;
+	case 3:
+		val = read_gicreg(ICH_AP0R3_EL2);
+		break;
+	default:
+		unreachable();
+	}
+
+	return val;
+}
+
+static u32 __vgic_v3_read_ap1rn(int n)
+{
+	u32 val;
+
+	switch (n) {
+	case 0:
+		val = read_gicreg(ICH_AP1R0_EL2);
+		break;
+	case 1:
+		val = read_gicreg(ICH_AP1R1_EL2);
+		break;
+	case 2:
+		val = read_gicreg(ICH_AP1R2_EL2);
+		break;
+	case 3:
+		val = read_gicreg(ICH_AP1R3_EL2);
+		break;
+	default:
+		unreachable();
+	}
+
+	return val;
+}
+
+void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if)
+{
+	u64 used_lrs = cpu_if->used_lrs;
+
+	/*
+	 * Make sure stores to the GIC via the memory mapped interface
+	 * are now visible to the system register interface when reading the
+	 * LRs, and when reading back the VMCR on non-VHE systems.
+	 */
+	if (used_lrs || !has_vhe()) {
+		if (!cpu_if->vgic_sre) {
+			dsb(sy);
+			isb();
+		}
+	}
+
+	if (used_lrs || cpu_if->its_vpe.its_vm) {
+		int i;
+		u32 elrsr;
+
+		elrsr = read_gicreg(ICH_ELRSR_EL2);
+
+		write_gicreg(cpu_if->vgic_hcr & ~ICH_HCR_EN, ICH_HCR_EL2);
+
+		for (i = 0; i < used_lrs; i++) {
+			if (elrsr & (1 << i))
+				cpu_if->vgic_lr[i] &= ~ICH_LR_STATE;
+			else
+				cpu_if->vgic_lr[i] = __gic_v3_get_lr(i);
+
+			__gic_v3_set_lr(0, i);
+		}
+	}
+}
+
+void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if)
+{
+	u64 used_lrs = cpu_if->used_lrs;
+	int i;
+
+	if (used_lrs || cpu_if->its_vpe.its_vm) {
+		write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2);
+
+		for (i = 0; i < used_lrs; i++)
+			__gic_v3_set_lr(cpu_if->vgic_lr[i], i);
+	}
+
+	/*
+	 * Ensure that writes to the LRs, and on non-VHE systems ensure that
+	 * the write to the VMCR in __vgic_v3_activate_traps(), will have
+	 * reached the (re)distributors. This ensure the guest will read the
+	 * correct values from the memory-mapped interface.
+	 */
+	if (used_lrs || !has_vhe()) {
+		if (!cpu_if->vgic_sre) {
+			isb();
+			dsb(sy);
+		}
+	}
+}
+
+void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if)
+{
+	/*
+	 * VFIQEn is RES1 if ICC_SRE_EL1.SRE is 1. This causes a
+	 * Group0 interrupt (as generated in GICv2 mode) to be
+	 * delivered as a FIQ to the guest, with potentially fatal
+	 * consequences. So we must make sure that ICC_SRE_EL1 has
+	 * been actually programmed with the value we want before
+	 * starting to mess with the rest of the GIC, and VMCR_EL2 in
+	 * particular.  This logic must be called before
+	 * __vgic_v3_restore_state().
+	 */
+	if (!cpu_if->vgic_sre) {
+		write_gicreg(0, ICC_SRE_EL1);
+		isb();
+		write_gicreg(cpu_if->vgic_vmcr, ICH_VMCR_EL2);
+
+
+		if (has_vhe()) {
+			/*
+			 * Ensure that the write to the VMCR will have reached
+			 * the (re)distributors. This ensure the guest will
+			 * read the correct values from the memory-mapped
+			 * interface.
+			 */
+			isb();
+			dsb(sy);
+		}
+	}
+
+	/*
+	 * Prevent the guest from touching the GIC system registers if
+	 * SRE isn't enabled for GICv3 emulation.
+	 */
+	write_gicreg(read_gicreg(ICC_SRE_EL2) & ~ICC_SRE_EL2_ENABLE,
+		     ICC_SRE_EL2);
+
+	/*
+	 * If we need to trap system registers, we must write
+	 * ICH_HCR_EL2 anyway, even if no interrupts are being
+	 * injected,
+	 */
+	if (static_branch_unlikely(&vgic_v3_cpuif_trap) ||
+	    cpu_if->its_vpe.its_vm)
+		write_gicreg(cpu_if->vgic_hcr, ICH_HCR_EL2);
+}
+
+void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if)
+{
+	u64 val;
+
+	if (!cpu_if->vgic_sre) {
+		cpu_if->vgic_vmcr = read_gicreg(ICH_VMCR_EL2);
+	}
+
+	val = read_gicreg(ICC_SRE_EL2);
+	write_gicreg(val | ICC_SRE_EL2_ENABLE, ICC_SRE_EL2);
+
+	if (!cpu_if->vgic_sre) {
+		/* Make sure ENABLE is set at EL2 before setting SRE at EL1 */
+		isb();
+		write_gicreg(1, ICC_SRE_EL1);
+	}
+
+	/*
+	 * If we were trapping system registers, we enabled the VGIC even if
+	 * no interrupts were being injected, and we disable it again here.
+	 */
+	if (static_branch_unlikely(&vgic_v3_cpuif_trap) ||
+	    cpu_if->its_vpe.its_vm)
+		write_gicreg(0, ICH_HCR_EL2);
+}
+
+void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if)
+{
+	u64 val;
+	u32 nr_pre_bits;
+
+	val = read_gicreg(ICH_VTR_EL2);
+	nr_pre_bits = vtr_to_nr_pre_bits(val);
+
+	switch (nr_pre_bits) {
+	case 7:
+		cpu_if->vgic_ap0r[3] = __vgic_v3_read_ap0rn(3);
+		cpu_if->vgic_ap0r[2] = __vgic_v3_read_ap0rn(2);
+		fallthrough;
+	case 6:
+		cpu_if->vgic_ap0r[1] = __vgic_v3_read_ap0rn(1);
+		fallthrough;
+	default:
+		cpu_if->vgic_ap0r[0] = __vgic_v3_read_ap0rn(0);
+	}
+
+	switch (nr_pre_bits) {
+	case 7:
+		cpu_if->vgic_ap1r[3] = __vgic_v3_read_ap1rn(3);
+		cpu_if->vgic_ap1r[2] = __vgic_v3_read_ap1rn(2);
+		fallthrough;
+	case 6:
+		cpu_if->vgic_ap1r[1] = __vgic_v3_read_ap1rn(1);
+		fallthrough;
+	default:
+		cpu_if->vgic_ap1r[0] = __vgic_v3_read_ap1rn(0);
+	}
+}
+
+void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if)
+{
+	u64 val;
+	u32 nr_pre_bits;
+
+	val = read_gicreg(ICH_VTR_EL2);
+	nr_pre_bits = vtr_to_nr_pre_bits(val);
+
+	switch (nr_pre_bits) {
+	case 7:
+		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[3], 3);
+		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[2], 2);
+		fallthrough;
+	case 6:
+		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[1], 1);
+		fallthrough;
+	default:
+		__vgic_v3_write_ap0rn(cpu_if->vgic_ap0r[0], 0);
+	}
+
+	switch (nr_pre_bits) {
+	case 7:
+		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[3], 3);
+		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[2], 2);
+		fallthrough;
+	case 6:
+		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[1], 1);
+		fallthrough;
+	default:
+		__vgic_v3_write_ap1rn(cpu_if->vgic_ap1r[0], 0);
+	}
+}
+
+void __vgic_v3_init_lrs(void)
+{
+	int max_lr_idx = vtr_to_max_lr_idx(read_gicreg(ICH_VTR_EL2));
+	int i;
+
+	for (i = 0; i <= max_lr_idx; i++)
+		__gic_v3_set_lr(0, i);
+}
+
+/*
+ * Return the GIC CPU configuration:
+ * - [31:0]  ICH_VTR_EL2
+ * - [62:32] RES0
+ * - [63]    MMIO (GICv2) capable
+ */
+u64 __vgic_v3_get_gic_config(void)
+{
+	u64 val, sre = read_gicreg(ICC_SRE_EL1);
+	unsigned long flags = 0;
+
+	/*
+	 * To check whether we have a MMIO-based (GICv2 compatible)
+	 * CPU interface, we need to disable the system register
+	 * view. To do that safely, we have to prevent any interrupt
+	 * from firing (which would be deadly).
+	 *
+	 * Note that this only makes sense on VHE, as interrupts are
+	 * already masked for nVHE as part of the exception entry to
+	 * EL2.
+	 */
+	if (has_vhe())
+		flags = local_daif_save();
+
+	/*
+	 * Table 11-2 "Permitted ICC_SRE_ELx.SRE settings" indicates
+	 * that to be able to set ICC_SRE_EL1.SRE to 0, all the
+	 * interrupt overrides must be set. You've got to love this.
+	 */
+	sysreg_clear_set(hcr_el2, 0, HCR_AMO | HCR_FMO | HCR_IMO);
+	isb();
+	write_gicreg(0, ICC_SRE_EL1);
+	isb();
+
+	val = read_gicreg(ICC_SRE_EL1);
+
+	write_gicreg(sre, ICC_SRE_EL1);
+	isb();
+	sysreg_clear_set(hcr_el2, HCR_AMO | HCR_FMO | HCR_IMO, 0);
+	isb();
+
+	if (has_vhe())
+		local_daif_restore(flags);
+
+	val  = (val & ICC_SRE_EL1_SRE) ? 0 : (1ULL << 63);
+	val |= read_gicreg(ICH_VTR_EL2);
+
+	return val;
+}
+
+u64 __vgic_v3_read_vmcr(void)
+{
+	return read_gicreg(ICH_VMCR_EL2);
+}
+
+void __vgic_v3_write_vmcr(u32 vmcr)
+{
+	write_gicreg(vmcr, ICH_VMCR_EL2);
+}
+
+static int __vgic_v3_bpr_min(void)
+{
+	/* See Pseudocode for VPriorityGroup */
+	return 8 - vtr_to_nr_pre_bits(read_gicreg(ICH_VTR_EL2));
+}
+
+static int __vgic_v3_get_group(struct kvm_vcpu *vcpu)
+{
+	u64 esr = kvm_vcpu_get_esr(vcpu);
+	u8 crm = (esr & ESR_ELx_SYS64_ISS_CRM_MASK) >> ESR_ELx_SYS64_ISS_CRM_SHIFT;
+
+	return crm != 8;
+}
+
+#define GICv3_IDLE_PRIORITY	0xff
+
+static int __vgic_v3_highest_priority_lr(struct kvm_vcpu *vcpu, u32 vmcr,
+					 u64 *lr_val)
+{
+	unsigned int used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs;
+	u8 priority = GICv3_IDLE_PRIORITY;
+	int i, lr = -1;
+
+	for (i = 0; i < used_lrs; i++) {
+		u64 val = __gic_v3_get_lr(i);
+		u8 lr_prio = (val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT;
+
+		/* Not pending in the state? */
+		if ((val & ICH_LR_STATE) != ICH_LR_PENDING_BIT)
+			continue;
+
+		/* Group-0 interrupt, but Group-0 disabled? */
+		if (!(val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG0_MASK))
+			continue;
+
+		/* Group-1 interrupt, but Group-1 disabled? */
+		if ((val & ICH_LR_GROUP) && !(vmcr & ICH_VMCR_ENG1_MASK))
+			continue;
+
+		/* Not the highest priority? */
+		if (lr_prio >= priority)
+			continue;
+
+		/* This is a candidate */
+		priority = lr_prio;
+		*lr_val = val;
+		lr = i;
+	}
+
+	if (lr == -1)
+		*lr_val = ICC_IAR1_EL1_SPURIOUS;
+
+	return lr;
+}
+
+static int __vgic_v3_find_active_lr(struct kvm_vcpu *vcpu, int intid,
+				    u64 *lr_val)
+{
+	unsigned int used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs;
+	int i;
+
+	for (i = 0; i < used_lrs; i++) {
+		u64 val = __gic_v3_get_lr(i);
+
+		if ((val & ICH_LR_VIRTUAL_ID_MASK) == intid &&
+		    (val & ICH_LR_ACTIVE_BIT)) {
+			*lr_val = val;
+			return i;
+		}
+	}
+
+	*lr_val = ICC_IAR1_EL1_SPURIOUS;
+	return -1;
+}
+
+static int __vgic_v3_get_highest_active_priority(void)
+{
+	u8 nr_apr_regs = vtr_to_nr_apr_regs(read_gicreg(ICH_VTR_EL2));
+	u32 hap = 0;
+	int i;
+
+	for (i = 0; i < nr_apr_regs; i++) {
+		u32 val;
+
+		/*
+		 * The ICH_AP0Rn_EL2 and ICH_AP1Rn_EL2 registers
+		 * contain the active priority levels for this VCPU
+		 * for the maximum number of supported priority
+		 * levels, and we return the full priority level only
+		 * if the BPR is programmed to its minimum, otherwise
+		 * we return a combination of the priority level and
+		 * subpriority, as determined by the setting of the
+		 * BPR, but without the full subpriority.
+		 */
+		val  = __vgic_v3_read_ap0rn(i);
+		val |= __vgic_v3_read_ap1rn(i);
+		if (!val) {
+			hap += 32;
+			continue;
+		}
+
+		return (hap + __ffs(val)) << __vgic_v3_bpr_min();
+	}
+
+	return GICv3_IDLE_PRIORITY;
+}
+
+static unsigned int __vgic_v3_get_bpr0(u32 vmcr)
+{
+	return (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
+}
+
+static unsigned int __vgic_v3_get_bpr1(u32 vmcr)
+{
+	unsigned int bpr;
+
+	if (vmcr & ICH_VMCR_CBPR_MASK) {
+		bpr = __vgic_v3_get_bpr0(vmcr);
+		if (bpr < 7)
+			bpr++;
+	} else {
+		bpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
+	}
+
+	return bpr;
+}
+
+/*
+ * Convert a priority to a preemption level, taking the relevant BPR
+ * into account by zeroing the sub-priority bits.
+ */
+static u8 __vgic_v3_pri_to_pre(u8 pri, u32 vmcr, int grp)
+{
+	unsigned int bpr;
+
+	if (!grp)
+		bpr = __vgic_v3_get_bpr0(vmcr) + 1;
+	else
+		bpr = __vgic_v3_get_bpr1(vmcr);
+
+	return pri & (GENMASK(7, 0) << bpr);
+}
+
+/*
+ * The priority value is independent of any of the BPR values, so we
+ * normalize it using the minimal BPR value. This guarantees that no
+ * matter what the guest does with its BPR, we can always set/get the
+ * same value of a priority.
+ */
+static void __vgic_v3_set_active_priority(u8 pri, u32 vmcr, int grp)
+{
+	u8 pre, ap;
+	u32 val;
+	int apr;
+
+	pre = __vgic_v3_pri_to_pre(pri, vmcr, grp);
+	ap = pre >> __vgic_v3_bpr_min();
+	apr = ap / 32;
+
+	if (!grp) {
+		val = __vgic_v3_read_ap0rn(apr);
+		__vgic_v3_write_ap0rn(val | BIT(ap % 32), apr);
+	} else {
+		val = __vgic_v3_read_ap1rn(apr);
+		__vgic_v3_write_ap1rn(val | BIT(ap % 32), apr);
+	}
+}
+
+static int __vgic_v3_clear_highest_active_priority(void)
+{
+	u8 nr_apr_regs = vtr_to_nr_apr_regs(read_gicreg(ICH_VTR_EL2));
+	u32 hap = 0;
+	int i;
+
+	for (i = 0; i < nr_apr_regs; i++) {
+		u32 ap0, ap1;
+		int c0, c1;
+
+		ap0 = __vgic_v3_read_ap0rn(i);
+		ap1 = __vgic_v3_read_ap1rn(i);
+		if (!ap0 && !ap1) {
+			hap += 32;
+			continue;
+		}
+
+		c0 = ap0 ? __ffs(ap0) : 32;
+		c1 = ap1 ? __ffs(ap1) : 32;
+
+		/* Always clear the LSB, which is the highest priority */
+		if (c0 < c1) {
+			ap0 &= ~BIT(c0);
+			__vgic_v3_write_ap0rn(ap0, i);
+			hap += c0;
+		} else {
+			ap1 &= ~BIT(c1);
+			__vgic_v3_write_ap1rn(ap1, i);
+			hap += c1;
+		}
+
+		/* Rescale to 8 bits of priority */
+		return hap << __vgic_v3_bpr_min();
+	}
+
+	return GICv3_IDLE_PRIORITY;
+}
+
+static void __vgic_v3_read_iar(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u64 lr_val;
+	u8 lr_prio, pmr;
+	int lr, grp;
+
+	grp = __vgic_v3_get_group(vcpu);
+
+	lr = __vgic_v3_highest_priority_lr(vcpu, vmcr, &lr_val);
+	if (lr < 0)
+		goto spurious;
+
+	if (grp != !!(lr_val & ICH_LR_GROUP))
+		goto spurious;
+
+	pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
+	lr_prio = (lr_val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT;
+	if (pmr <= lr_prio)
+		goto spurious;
+
+	if (__vgic_v3_get_highest_active_priority() <= __vgic_v3_pri_to_pre(lr_prio, vmcr, grp))
+		goto spurious;
+
+	lr_val &= ~ICH_LR_STATE;
+	lr_val |= ICH_LR_ACTIVE_BIT;
+	__gic_v3_set_lr(lr_val, lr);
+	__vgic_v3_set_active_priority(lr_prio, vmcr, grp);
+	vcpu_set_reg(vcpu, rt, lr_val & ICH_LR_VIRTUAL_ID_MASK);
+	return;
+
+spurious:
+	vcpu_set_reg(vcpu, rt, ICC_IAR1_EL1_SPURIOUS);
+}
+
+static void __vgic_v3_clear_active_lr(int lr, u64 lr_val)
+{
+	lr_val &= ~ICH_LR_ACTIVE_BIT;
+	if (lr_val & ICH_LR_HW) {
+		u32 pid;
+
+		pid = (lr_val & ICH_LR_PHYS_ID_MASK) >> ICH_LR_PHYS_ID_SHIFT;
+		gic_write_dir(pid);
+	}
+
+	__gic_v3_set_lr(lr_val, lr);
+}
+
+static void __vgic_v3_bump_eoicount(void)
+{
+	u32 hcr;
+
+	hcr = read_gicreg(ICH_HCR_EL2);
+	hcr += 1 << ICH_HCR_EOIcount_SHIFT;
+	write_gicreg(hcr, ICH_HCR_EL2);
+}
+
+static void __vgic_v3_write_dir(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u32 vid = vcpu_get_reg(vcpu, rt);
+	u64 lr_val;
+	int lr;
+
+	/* EOImode == 0, nothing to be done here */
+	if (!(vmcr & ICH_VMCR_EOIM_MASK))
+		return;
+
+	/* No deactivate to be performed on an LPI */
+	if (vid >= VGIC_MIN_LPI)
+		return;
+
+	lr = __vgic_v3_find_active_lr(vcpu, vid, &lr_val);
+	if (lr == -1) {
+		__vgic_v3_bump_eoicount();
+		return;
+	}
+
+	__vgic_v3_clear_active_lr(lr, lr_val);
+}
+
+static void __vgic_v3_write_eoir(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u32 vid = vcpu_get_reg(vcpu, rt);
+	u64 lr_val;
+	u8 lr_prio, act_prio;
+	int lr, grp;
+
+	grp = __vgic_v3_get_group(vcpu);
+
+	/* Drop priority in any case */
+	act_prio = __vgic_v3_clear_highest_active_priority();
+
+	lr = __vgic_v3_find_active_lr(vcpu, vid, &lr_val);
+	if (lr == -1) {
+		/* Do not bump EOIcount for LPIs that aren't in the LRs */
+		if (!(vid >= VGIC_MIN_LPI))
+			__vgic_v3_bump_eoicount();
+		return;
+	}
+
+	/* EOImode == 1 and not an LPI, nothing to be done here */
+	if ((vmcr & ICH_VMCR_EOIM_MASK) && !(vid >= VGIC_MIN_LPI))
+		return;
+
+	lr_prio = (lr_val & ICH_LR_PRIORITY_MASK) >> ICH_LR_PRIORITY_SHIFT;
+
+	/* If priorities or group do not match, the guest has fscked-up. */
+	if (grp != !!(lr_val & ICH_LR_GROUP) ||
+	    __vgic_v3_pri_to_pre(lr_prio, vmcr, grp) != act_prio)
+		return;
+
+	/* Let's now perform the deactivation */
+	__vgic_v3_clear_active_lr(lr, lr_val);
+}
+
+static void __vgic_v3_read_igrpen0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	vcpu_set_reg(vcpu, rt, !!(vmcr & ICH_VMCR_ENG0_MASK));
+}
+
+static void __vgic_v3_read_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	vcpu_set_reg(vcpu, rt, !!(vmcr & ICH_VMCR_ENG1_MASK));
+}
+
+static void __vgic_v3_write_igrpen0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u64 val = vcpu_get_reg(vcpu, rt);
+
+	if (val & 1)
+		vmcr |= ICH_VMCR_ENG0_MASK;
+	else
+		vmcr &= ~ICH_VMCR_ENG0_MASK;
+
+	__vgic_v3_write_vmcr(vmcr);
+}
+
+static void __vgic_v3_write_igrpen1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u64 val = vcpu_get_reg(vcpu, rt);
+
+	if (val & 1)
+		vmcr |= ICH_VMCR_ENG1_MASK;
+	else
+		vmcr &= ~ICH_VMCR_ENG1_MASK;
+
+	__vgic_v3_write_vmcr(vmcr);
+}
+
+static void __vgic_v3_read_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr0(vmcr));
+}
+
+static void __vgic_v3_read_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	vcpu_set_reg(vcpu, rt, __vgic_v3_get_bpr1(vmcr));
+}
+
+static void __vgic_v3_write_bpr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u64 val = vcpu_get_reg(vcpu, rt);
+	u8 bpr_min = __vgic_v3_bpr_min() - 1;
+
+	/* Enforce BPR limiting */
+	if (val < bpr_min)
+		val = bpr_min;
+
+	val <<= ICH_VMCR_BPR0_SHIFT;
+	val &= ICH_VMCR_BPR0_MASK;
+	vmcr &= ~ICH_VMCR_BPR0_MASK;
+	vmcr |= val;
+
+	__vgic_v3_write_vmcr(vmcr);
+}
+
+static void __vgic_v3_write_bpr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u64 val = vcpu_get_reg(vcpu, rt);
+	u8 bpr_min = __vgic_v3_bpr_min();
+
+	if (vmcr & ICH_VMCR_CBPR_MASK)
+		return;
+
+	/* Enforce BPR limiting */
+	if (val < bpr_min)
+		val = bpr_min;
+
+	val <<= ICH_VMCR_BPR1_SHIFT;
+	val &= ICH_VMCR_BPR1_MASK;
+	vmcr &= ~ICH_VMCR_BPR1_MASK;
+	vmcr |= val;
+
+	__vgic_v3_write_vmcr(vmcr);
+}
+
+static void __vgic_v3_read_apxrn(struct kvm_vcpu *vcpu, int rt, int n)
+{
+	u32 val;
+
+	if (!__vgic_v3_get_group(vcpu))
+		val = __vgic_v3_read_ap0rn(n);
+	else
+		val = __vgic_v3_read_ap1rn(n);
+
+	vcpu_set_reg(vcpu, rt, val);
+}
+
+static void __vgic_v3_write_apxrn(struct kvm_vcpu *vcpu, int rt, int n)
+{
+	u32 val = vcpu_get_reg(vcpu, rt);
+
+	if (!__vgic_v3_get_group(vcpu))
+		__vgic_v3_write_ap0rn(val, n);
+	else
+		__vgic_v3_write_ap1rn(val, n);
+}
+
+static void __vgic_v3_read_apxr0(struct kvm_vcpu *vcpu,
+					    u32 vmcr, int rt)
+{
+	__vgic_v3_read_apxrn(vcpu, rt, 0);
+}
+
+static void __vgic_v3_read_apxr1(struct kvm_vcpu *vcpu,
+					    u32 vmcr, int rt)
+{
+	__vgic_v3_read_apxrn(vcpu, rt, 1);
+}
+
+static void __vgic_v3_read_apxr2(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	__vgic_v3_read_apxrn(vcpu, rt, 2);
+}
+
+static void __vgic_v3_read_apxr3(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	__vgic_v3_read_apxrn(vcpu, rt, 3);
+}
+
+static void __vgic_v3_write_apxr0(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	__vgic_v3_write_apxrn(vcpu, rt, 0);
+}
+
+static void __vgic_v3_write_apxr1(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	__vgic_v3_write_apxrn(vcpu, rt, 1);
+}
+
+static void __vgic_v3_write_apxr2(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	__vgic_v3_write_apxrn(vcpu, rt, 2);
+}
+
+static void __vgic_v3_write_apxr3(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	__vgic_v3_write_apxrn(vcpu, rt, 3);
+}
+
+static void __vgic_v3_read_hppir(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u64 lr_val;
+	int lr, lr_grp, grp;
+
+	grp = __vgic_v3_get_group(vcpu);
+
+	lr = __vgic_v3_highest_priority_lr(vcpu, vmcr, &lr_val);
+	if (lr == -1)
+		goto spurious;
+
+	lr_grp = !!(lr_val & ICH_LR_GROUP);
+	if (lr_grp != grp)
+		lr_val = ICC_IAR1_EL1_SPURIOUS;
+
+spurious:
+	vcpu_set_reg(vcpu, rt, lr_val & ICH_LR_VIRTUAL_ID_MASK);
+}
+
+static void __vgic_v3_read_pmr(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	vmcr &= ICH_VMCR_PMR_MASK;
+	vmcr >>= ICH_VMCR_PMR_SHIFT;
+	vcpu_set_reg(vcpu, rt, vmcr);
+}
+
+static void __vgic_v3_write_pmr(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u32 val = vcpu_get_reg(vcpu, rt);
+
+	val <<= ICH_VMCR_PMR_SHIFT;
+	val &= ICH_VMCR_PMR_MASK;
+	vmcr &= ~ICH_VMCR_PMR_MASK;
+	vmcr |= val;
+
+	write_gicreg(vmcr, ICH_VMCR_EL2);
+}
+
+static void __vgic_v3_read_rpr(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u32 val = __vgic_v3_get_highest_active_priority();
+	vcpu_set_reg(vcpu, rt, val);
+}
+
+static void __vgic_v3_read_ctlr(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u32 vtr, val;
+
+	vtr = read_gicreg(ICH_VTR_EL2);
+	/* PRIbits */
+	val = ((vtr >> 29) & 7) << ICC_CTLR_EL1_PRI_BITS_SHIFT;
+	/* IDbits */
+	val |= ((vtr >> 23) & 7) << ICC_CTLR_EL1_ID_BITS_SHIFT;
+	/* SEIS */
+	if (kvm_vgic_global_state.ich_vtr_el2 & ICH_VTR_SEIS_MASK)
+		val |= BIT(ICC_CTLR_EL1_SEIS_SHIFT);
+	/* A3V */
+	val |= ((vtr >> 21) & 1) << ICC_CTLR_EL1_A3V_SHIFT;
+	/* EOImode */
+	val |= ((vmcr & ICH_VMCR_EOIM_MASK) >> ICH_VMCR_EOIM_SHIFT) << ICC_CTLR_EL1_EOImode_SHIFT;
+	/* CBPR */
+	val |= (vmcr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT;
+
+	vcpu_set_reg(vcpu, rt, val);
+}
+
+static void __vgic_v3_write_ctlr(struct kvm_vcpu *vcpu, u32 vmcr, int rt)
+{
+	u32 val = vcpu_get_reg(vcpu, rt);
+
+	if (val & ICC_CTLR_EL1_CBPR_MASK)
+		vmcr |= ICH_VMCR_CBPR_MASK;
+	else
+		vmcr &= ~ICH_VMCR_CBPR_MASK;
+
+	if (val & ICC_CTLR_EL1_EOImode_MASK)
+		vmcr |= ICH_VMCR_EOIM_MASK;
+	else
+		vmcr &= ~ICH_VMCR_EOIM_MASK;
+
+	write_gicreg(vmcr, ICH_VMCR_EL2);
+}
+
+int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
+{
+	int rt;
+	u64 esr;
+	u32 vmcr;
+	void (*fn)(struct kvm_vcpu *, u32, int);
+	bool is_read;
+	u32 sysreg;
+
+	esr = kvm_vcpu_get_esr(vcpu);
+	if (vcpu_mode_is_32bit(vcpu)) {
+		if (!kvm_condition_valid(vcpu)) {
+			__kvm_skip_instr(vcpu);
+			return 1;
+		}
+
+		sysreg = esr_cp15_to_sysreg(esr);
+	} else {
+		sysreg = esr_sys64_to_sysreg(esr);
+	}
+
+	is_read = (esr & ESR_ELx_SYS64_ISS_DIR_MASK) == ESR_ELx_SYS64_ISS_DIR_READ;
+
+	switch (sysreg) {
+	case SYS_ICC_IAR0_EL1:
+	case SYS_ICC_IAR1_EL1:
+		if (unlikely(!is_read))
+			return 0;
+		fn = __vgic_v3_read_iar;
+		break;
+	case SYS_ICC_EOIR0_EL1:
+	case SYS_ICC_EOIR1_EL1:
+		if (unlikely(is_read))
+			return 0;
+		fn = __vgic_v3_write_eoir;
+		break;
+	case SYS_ICC_IGRPEN1_EL1:
+		if (is_read)
+			fn = __vgic_v3_read_igrpen1;
+		else
+			fn = __vgic_v3_write_igrpen1;
+		break;
+	case SYS_ICC_BPR1_EL1:
+		if (is_read)
+			fn = __vgic_v3_read_bpr1;
+		else
+			fn = __vgic_v3_write_bpr1;
+		break;
+	case SYS_ICC_AP0Rn_EL1(0):
+	case SYS_ICC_AP1Rn_EL1(0):
+		if (is_read)
+			fn = __vgic_v3_read_apxr0;
+		else
+			fn = __vgic_v3_write_apxr0;
+		break;
+	case SYS_ICC_AP0Rn_EL1(1):
+	case SYS_ICC_AP1Rn_EL1(1):
+		if (is_read)
+			fn = __vgic_v3_read_apxr1;
+		else
+			fn = __vgic_v3_write_apxr1;
+		break;
+	case SYS_ICC_AP0Rn_EL1(2):
+	case SYS_ICC_AP1Rn_EL1(2):
+		if (is_read)
+			fn = __vgic_v3_read_apxr2;
+		else
+			fn = __vgic_v3_write_apxr2;
+		break;
+	case SYS_ICC_AP0Rn_EL1(3):
+	case SYS_ICC_AP1Rn_EL1(3):
+		if (is_read)
+			fn = __vgic_v3_read_apxr3;
+		else
+			fn = __vgic_v3_write_apxr3;
+		break;
+	case SYS_ICC_HPPIR0_EL1:
+	case SYS_ICC_HPPIR1_EL1:
+		if (unlikely(!is_read))
+			return 0;
+		fn = __vgic_v3_read_hppir;
+		break;
+	case SYS_ICC_IGRPEN0_EL1:
+		if (is_read)
+			fn = __vgic_v3_read_igrpen0;
+		else
+			fn = __vgic_v3_write_igrpen0;
+		break;
+	case SYS_ICC_BPR0_EL1:
+		if (is_read)
+			fn = __vgic_v3_read_bpr0;
+		else
+			fn = __vgic_v3_write_bpr0;
+		break;
+	case SYS_ICC_DIR_EL1:
+		if (unlikely(is_read))
+			return 0;
+		fn = __vgic_v3_write_dir;
+		break;
+	case SYS_ICC_RPR_EL1:
+		if (unlikely(!is_read))
+			return 0;
+		fn = __vgic_v3_read_rpr;
+		break;
+	case SYS_ICC_CTLR_EL1:
+		if (is_read)
+			fn = __vgic_v3_read_ctlr;
+		else
+			fn = __vgic_v3_write_ctlr;
+		break;
+	case SYS_ICC_PMR_EL1:
+		if (is_read)
+			fn = __vgic_v3_read_pmr;
+		else
+			fn = __vgic_v3_write_pmr;
+		break;
+	default:
+		return 0;
+	}
+
+	vmcr = __vgic_v3_read_vmcr();
+	rt = kvm_vcpu_sys_get_rt(vcpu);
+	fn(vcpu, vmcr, rt);
+
+	__kvm_skip_instr(vcpu);
+
+	return 1;
+}
diff --git a/arch/arm64/kvm/hyp/vhe/Makefile b/arch/arm64/kvm/hyp/vhe/Makefile
new file mode 100644
index 000000000..96bec0ecf
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vhe/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part
+#
+
+asflags-y := -D__KVM_VHE_HYPERVISOR__
+ccflags-y := -D__KVM_VHE_HYPERVISOR__
+
+obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o
+obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
+	 ../fpsimd.o ../hyp-entry.o ../exception.o
diff --git a/arch/arm64/kvm/hyp/vhe/debug-sr.c b/arch/arm64/kvm/hyp/vhe/debug-sr.c
new file mode 100644
index 000000000..289689b26
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vhe/debug-sr.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/debug-sr.h>
+
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_hyp.h>
+
+void __debug_switch_to_guest(struct kvm_vcpu *vcpu)
+{
+	__debug_switch_to_guest_common(vcpu);
+}
+
+void __debug_switch_to_host(struct kvm_vcpu *vcpu)
+{
+	__debug_switch_to_host_common(vcpu);
+}
+
+u64 __kvm_get_mdcr_el2(void)
+{
+	return read_sysreg(mdcr_el2);
+}
diff --git a/arch/arm64/kvm/hyp/vhe/switch.c b/arch/arm64/kvm/hyp/vhe/switch.c
new file mode 100644
index 000000000..45ac4a59c
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vhe/switch.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/switch.h>
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+#include <linux/types.h>
+#include <linux/jump_label.h>
+#include <linux/percpu.h>
+#include <uapi/linux/psci.h>
+
+#include <kvm/arm_psci.h>
+
+#include <asm/barrier.h>
+#include <asm/cpufeature.h>
+#include <asm/kprobes.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/fpsimd.h>
+#include <asm/debug-monitors.h>
+#include <asm/processor.h>
+#include <asm/thread_info.h>
+#include <asm/vectors.h>
+
+/* VHE specific context */
+DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data);
+DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
+DEFINE_PER_CPU(unsigned long, kvm_hyp_vector);
+
+static void __activate_traps(struct kvm_vcpu *vcpu)
+{
+	u64 val;
+
+	___activate_traps(vcpu);
+
+	val = read_sysreg(cpacr_el1);
+	val |= CPACR_EL1_TTA;
+	val &= ~(CPACR_EL1_ZEN_EL0EN | CPACR_EL1_ZEN_EL1EN |
+		 CPACR_EL1_SMEN_EL0EN | CPACR_EL1_SMEN_EL1EN);
+
+	/*
+	 * With VHE (HCR.E2H == 1), accesses to CPACR_EL1 are routed to
+	 * CPTR_EL2. In general, CPACR_EL1 has the same layout as CPTR_EL2,
+	 * except for some missing controls, such as TAM.
+	 * In this case, CPTR_EL2.TAM has the same position with or without
+	 * VHE (HCR.E2H == 1) which allows us to use here the CPTR_EL2.TAM
+	 * shift value for trapping the AMU accesses.
+	 */
+
+	val |= CPTR_EL2_TAM;
+
+	if (guest_owns_fp_regs(vcpu)) {
+		if (vcpu_has_sve(vcpu))
+			val |= CPACR_EL1_ZEN_EL0EN | CPACR_EL1_ZEN_EL1EN;
+	} else {
+		val &= ~(CPACR_EL1_FPEN_EL0EN | CPACR_EL1_FPEN_EL1EN);
+		__activate_traps_fpsimd32(vcpu);
+	}
+
+	write_sysreg(val, cpacr_el1);
+
+	write_sysreg(__this_cpu_read(kvm_hyp_vector), vbar_el1);
+}
+NOKPROBE_SYMBOL(__activate_traps);
+
+static void __deactivate_traps(struct kvm_vcpu *vcpu)
+{
+	const char *host_vectors = vectors;
+
+	___deactivate_traps(vcpu);
+
+	write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2);
+
+	/*
+	 * ARM errata 1165522 and 1530923 require the actual execution of the
+	 * above before we can switch to the EL2/EL0 translation regime used by
+	 * the host.
+	 */
+	asm(ALTERNATIVE("nop", "isb", ARM64_WORKAROUND_SPECULATIVE_AT));
+
+	write_sysreg(CPACR_EL1_DEFAULT, cpacr_el1);
+
+	if (!arm64_kernel_unmapped_at_el0())
+		host_vectors = __this_cpu_read(this_cpu_vector);
+	write_sysreg(host_vectors, vbar_el1);
+}
+NOKPROBE_SYMBOL(__deactivate_traps);
+
+void activate_traps_vhe_load(struct kvm_vcpu *vcpu)
+{
+	__activate_traps_common(vcpu);
+}
+
+void deactivate_traps_vhe_put(struct kvm_vcpu *vcpu)
+{
+	__deactivate_traps_common(vcpu);
+}
+
+static const exit_handler_fn hyp_exit_handlers[] = {
+	[0 ... ESR_ELx_EC_MAX]		= NULL,
+	[ESR_ELx_EC_CP15_32]		= kvm_hyp_handle_cp15_32,
+	[ESR_ELx_EC_SYS64]		= kvm_hyp_handle_sysreg,
+	[ESR_ELx_EC_SVE]		= kvm_hyp_handle_fpsimd,
+	[ESR_ELx_EC_FP_ASIMD]		= kvm_hyp_handle_fpsimd,
+	[ESR_ELx_EC_IABT_LOW]		= kvm_hyp_handle_iabt_low,
+	[ESR_ELx_EC_DABT_LOW]		= kvm_hyp_handle_dabt_low,
+	[ESR_ELx_EC_WATCHPT_LOW]	= kvm_hyp_handle_watchpt_low,
+	[ESR_ELx_EC_PAC]		= kvm_hyp_handle_ptrauth,
+};
+
+static const exit_handler_fn *kvm_get_exit_handler_array(struct kvm_vcpu *vcpu)
+{
+	return hyp_exit_handlers;
+}
+
+static void early_exit_filter(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+}
+
+/* Switch to the guest for VHE systems running in EL2 */
+static int __kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpu_context *host_ctxt;
+	struct kvm_cpu_context *guest_ctxt;
+	u64 exit_code;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	host_ctxt->__hyp_running_vcpu = vcpu;
+	guest_ctxt = &vcpu->arch.ctxt;
+
+	sysreg_save_host_state_vhe(host_ctxt);
+
+	/*
+	 * ARM erratum 1165522 requires us to configure both stage 1 and
+	 * stage 2 translation for the guest context before we clear
+	 * HCR_EL2.TGE.
+	 *
+	 * We have already configured the guest's stage 1 translation in
+	 * kvm_vcpu_load_sysregs_vhe above.  We must now call
+	 * __load_stage2 before __activate_traps, because
+	 * __load_stage2 configures stage 2 translation, and
+	 * __activate_traps clear HCR_EL2.TGE (among other things).
+	 */
+	__load_stage2(vcpu->arch.hw_mmu, vcpu->arch.hw_mmu->arch);
+	__activate_traps(vcpu);
+
+	__kvm_adjust_pc(vcpu);
+
+	sysreg_restore_guest_state_vhe(guest_ctxt);
+	__debug_switch_to_guest(vcpu);
+
+	do {
+		/* Jump in the fire! */
+		exit_code = __guest_enter(vcpu);
+
+		/* And we're baaack! */
+	} while (fixup_guest_exit(vcpu, &exit_code));
+
+	sysreg_save_guest_state_vhe(guest_ctxt);
+
+	__deactivate_traps(vcpu);
+
+	sysreg_restore_host_state_vhe(host_ctxt);
+
+	if (vcpu->arch.fp_state == FP_STATE_GUEST_OWNED)
+		__fpsimd_save_fpexc32(vcpu);
+
+	__debug_switch_to_host(vcpu);
+
+	return exit_code;
+}
+NOKPROBE_SYMBOL(__kvm_vcpu_run_vhe);
+
+int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
+{
+	int ret;
+
+	local_daif_mask();
+
+	/*
+	 * Having IRQs masked via PMR when entering the guest means the GIC
+	 * will not signal the CPU of interrupts of lower priority, and the
+	 * only way to get out will be via guest exceptions.
+	 * Naturally, we want to avoid this.
+	 *
+	 * local_daif_mask() already sets GIC_PRIO_PSR_I_SET, we just need a
+	 * dsb to ensure the redistributor is forwards EL2 IRQs to the CPU.
+	 */
+	pmr_sync();
+
+	ret = __kvm_vcpu_run_vhe(vcpu);
+
+	/*
+	 * local_daif_restore() takes care to properly restore PSTATE.DAIF
+	 * and the GIC PMR if the host is using IRQ priorities.
+	 */
+	local_daif_restore(DAIF_PROCCTX_NOIRQ);
+
+	/*
+	 * When we exit from the guest we change a number of CPU configuration
+	 * parameters, such as traps.  Make sure these changes take effect
+	 * before running the host or additional guests.
+	 */
+	isb();
+
+	return ret;
+}
+
+static void __hyp_call_panic(u64 spsr, u64 elr, u64 par)
+{
+	struct kvm_cpu_context *host_ctxt;
+	struct kvm_vcpu *vcpu;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	vcpu = host_ctxt->__hyp_running_vcpu;
+
+	__deactivate_traps(vcpu);
+	sysreg_restore_host_state_vhe(host_ctxt);
+
+	panic("HYP panic:\nPS:%08llx PC:%016llx ESR:%08llx\nFAR:%016llx HPFAR:%016llx PAR:%016llx\nVCPU:%p\n",
+	      spsr, elr,
+	      read_sysreg_el2(SYS_ESR), read_sysreg_el2(SYS_FAR),
+	      read_sysreg(hpfar_el2), par, vcpu);
+}
+NOKPROBE_SYMBOL(__hyp_call_panic);
+
+void __noreturn hyp_panic(void)
+{
+	u64 spsr = read_sysreg_el2(SYS_SPSR);
+	u64 elr = read_sysreg_el2(SYS_ELR);
+	u64 par = read_sysreg_par();
+
+	__hyp_call_panic(spsr, elr, par);
+	unreachable();
+}
+
+asmlinkage void kvm_unexpected_el2_exception(void)
+{
+	__kvm_unexpected_el2_exception();
+}
diff --git a/arch/arm64/kvm/hyp/vhe/sysreg-sr.c b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
new file mode 100644
index 000000000..7b44f6b3b
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <hyp/sysreg-sr.h>
+
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kprobes.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+
+/*
+ * VHE: Host and guest must save mdscr_el1 and sp_el0 (and the PC and
+ * pstate, which are handled as part of the el2 return state) on every
+ * switch (sp_el0 is being dealt with in the assembly code).
+ * tpidr_el0 and tpidrro_el0 only need to be switched when going
+ * to host userspace or a different VCPU.  EL1 registers only need to be
+ * switched when potentially going to run a different VCPU.  The latter two
+ * classes are handled as part of kvm_arch_vcpu_load and kvm_arch_vcpu_put.
+ */
+
+void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt)
+{
+	__sysreg_save_common_state(ctxt);
+}
+NOKPROBE_SYMBOL(sysreg_save_host_state_vhe);
+
+void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt)
+{
+	__sysreg_save_common_state(ctxt);
+	__sysreg_save_el2_return_state(ctxt);
+}
+NOKPROBE_SYMBOL(sysreg_save_guest_state_vhe);
+
+void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt)
+{
+	__sysreg_restore_common_state(ctxt);
+}
+NOKPROBE_SYMBOL(sysreg_restore_host_state_vhe);
+
+void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt)
+{
+	__sysreg_restore_common_state(ctxt);
+	__sysreg_restore_el2_return_state(ctxt);
+}
+NOKPROBE_SYMBOL(sysreg_restore_guest_state_vhe);
+
+/**
+ * kvm_vcpu_load_sysregs_vhe - Load guest system registers to the physical CPU
+ *
+ * @vcpu: The VCPU pointer
+ *
+ * Load system registers that do not affect the host's execution, for
+ * example EL1 system registers on a VHE system where the host kernel
+ * runs at EL2.  This function is called from KVM's vcpu_load() function
+ * and loading system register state early avoids having to load them on
+ * every entry to the VM.
+ */
+void kvm_vcpu_load_sysregs_vhe(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpu_context *guest_ctxt = &vcpu->arch.ctxt;
+	struct kvm_cpu_context *host_ctxt;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	__sysreg_save_user_state(host_ctxt);
+
+	/*
+	 * Load guest EL1 and user state
+	 *
+	 * We must restore the 32-bit state before the sysregs, thanks
+	 * to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72).
+	 */
+	__sysreg32_restore_state(vcpu);
+	__sysreg_restore_user_state(guest_ctxt);
+	__sysreg_restore_el1_state(guest_ctxt);
+
+	vcpu_set_flag(vcpu, SYSREGS_ON_CPU);
+
+	activate_traps_vhe_load(vcpu);
+}
+
+/**
+ * kvm_vcpu_put_sysregs_vhe - Restore host system registers to the physical CPU
+ *
+ * @vcpu: The VCPU pointer
+ *
+ * Save guest system registers that do not affect the host's execution, for
+ * example EL1 system registers on a VHE system where the host kernel
+ * runs at EL2.  This function is called from KVM's vcpu_put() function
+ * and deferring saving system register state until we're no longer running the
+ * VCPU avoids having to save them on every exit from the VM.
+ */
+void kvm_vcpu_put_sysregs_vhe(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpu_context *guest_ctxt = &vcpu->arch.ctxt;
+	struct kvm_cpu_context *host_ctxt;
+
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
+	deactivate_traps_vhe_put(vcpu);
+
+	__sysreg_save_el1_state(guest_ctxt);
+	__sysreg_save_user_state(guest_ctxt);
+	__sysreg32_save_state(vcpu);
+
+	/* Restore host user state */
+	__sysreg_restore_user_state(host_ctxt);
+
+	vcpu_clear_flag(vcpu, SYSREGS_ON_CPU);
+}
diff --git a/arch/arm64/kvm/hyp/vhe/timer-sr.c b/arch/arm64/kvm/hyp/vhe/timer-sr.c
new file mode 100644
index 000000000..4cda674a8
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vhe/timer-sr.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <asm/kvm_hyp.h>
+
+void __kvm_timer_set_cntvoff(u64 cntvoff)
+{
+	write_sysreg(cntvoff, cntvoff_el2);
+}
diff --git a/arch/arm64/kvm/hyp/vhe/tlb.c b/arch/arm64/kvm/hyp/vhe/tlb.c
new file mode 100644
index 000000000..24cef9b87
--- /dev/null
+++ b/arch/arm64/kvm/hyp/vhe/tlb.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/irqflags.h>
+
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/tlbflush.h>
+
+struct tlb_inv_context {
+	unsigned long	flags;
+	u64		tcr;
+	u64		sctlr;
+};
+
+static void __tlb_switch_to_guest(struct kvm_s2_mmu *mmu,
+				  struct tlb_inv_context *cxt)
+{
+	u64 val;
+
+	local_irq_save(cxt->flags);
+
+	if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
+		/*
+		 * For CPUs that are affected by ARM errata 1165522 or 1530923,
+		 * we cannot trust stage-1 to be in a correct state at that
+		 * point. Since we do not want to force a full load of the
+		 * vcpu state, we prevent the EL1 page-table walker to
+		 * allocate new TLBs. This is done by setting the EPD bits
+		 * in the TCR_EL1 register. We also need to prevent it to
+		 * allocate IPA->PA walks, so we enable the S1 MMU...
+		 */
+		val = cxt->tcr = read_sysreg_el1(SYS_TCR);
+		val |= TCR_EPD1_MASK | TCR_EPD0_MASK;
+		write_sysreg_el1(val, SYS_TCR);
+		val = cxt->sctlr = read_sysreg_el1(SYS_SCTLR);
+		val |= SCTLR_ELx_M;
+		write_sysreg_el1(val, SYS_SCTLR);
+	}
+
+	/*
+	 * With VHE enabled, we have HCR_EL2.{E2H,TGE} = {1,1}, and
+	 * most TLB operations target EL2/EL0. In order to affect the
+	 * guest TLBs (EL1/EL0), we need to change one of these two
+	 * bits. Changing E2H is impossible (goodbye TTBR1_EL2), so
+	 * let's flip TGE before executing the TLB operation.
+	 *
+	 * ARM erratum 1165522 requires some special handling (again),
+	 * as we need to make sure both stages of translation are in
+	 * place before clearing TGE. __load_stage2() already
+	 * has an ISB in order to deal with this.
+	 */
+	__load_stage2(mmu, mmu->arch);
+	val = read_sysreg(hcr_el2);
+	val &= ~HCR_TGE;
+	write_sysreg(val, hcr_el2);
+	isb();
+}
+
+static void __tlb_switch_to_host(struct tlb_inv_context *cxt)
+{
+	/*
+	 * We're done with the TLB operation, let's restore the host's
+	 * view of HCR_EL2.
+	 */
+	write_sysreg(0, vttbr_el2);
+	write_sysreg(HCR_HOST_VHE_FLAGS, hcr_el2);
+	isb();
+
+	if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) {
+		/* Restore the registers to what they were */
+		write_sysreg_el1(cxt->tcr, SYS_TCR);
+		write_sysreg_el1(cxt->sctlr, SYS_SCTLR);
+	}
+
+	local_irq_restore(cxt->flags);
+}
+
+void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu,
+			      phys_addr_t ipa, int level)
+{
+	struct tlb_inv_context cxt;
+
+	dsb(ishst);
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest(mmu, &cxt);
+
+	/*
+	 * We could do so much better if we had the VA as well.
+	 * Instead, we invalidate Stage-2 for this IPA, and the
+	 * whole of Stage-1. Weep...
+	 */
+	ipa >>= 12;
+	__tlbi_level(ipas2e1is, ipa, level);
+
+	/*
+	 * We have to ensure completion of the invalidation at Stage-2,
+	 * since a table walk on another CPU could refill a TLB with a
+	 * complete (S1 + S2) walk based on the old Stage-2 mapping if
+	 * the Stage-1 invalidation happened first.
+	 */
+	dsb(ish);
+	__tlbi(vmalle1is);
+	dsb(ish);
+	isb();
+
+	__tlb_switch_to_host(&cxt);
+}
+
+void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu)
+{
+	struct tlb_inv_context cxt;
+
+	dsb(ishst);
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest(mmu, &cxt);
+
+	__tlbi(vmalls12e1is);
+	dsb(ish);
+	isb();
+
+	__tlb_switch_to_host(&cxt);
+}
+
+void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu)
+{
+	struct tlb_inv_context cxt;
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest(mmu, &cxt);
+
+	__tlbi(vmalle1);
+	asm volatile("ic iallu");
+	dsb(nsh);
+	isb();
+
+	__tlb_switch_to_host(&cxt);
+}
+
+void __kvm_flush_vm_context(void)
+{
+	dsb(ishst);
+	__tlbi(alle1is);
+
+	/*
+	 * VIPT and PIPT caches are not affected by VMID, so no maintenance
+	 * is necessary across a VMID rollover.
+	 *
+	 * VPIPT caches constrain lookup and maintenance to the active VMID,
+	 * so we need to invalidate lines with a stale VMID to avoid an ABA
+	 * race after multiple rollovers.
+	 *
+	 */
+	if (icache_is_vpipt())
+		asm volatile("ic ialluis");
+
+	dsb(ish);
+}
diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c
new file mode 100644
index 000000000..1f5beebf6
--- /dev/null
+++ b/arch/arm64/kvm/hypercalls.c
@@ -0,0 +1,483 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Arm Ltd.
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_emulate.h>
+
+#include <kvm/arm_hypercalls.h>
+#include <kvm/arm_psci.h>
+
+#define KVM_ARM_SMCCC_STD_FEATURES				\
+	GENMASK(KVM_REG_ARM_STD_BMAP_BIT_COUNT - 1, 0)
+#define KVM_ARM_SMCCC_STD_HYP_FEATURES				\
+	GENMASK(KVM_REG_ARM_STD_HYP_BMAP_BIT_COUNT - 1, 0)
+#define KVM_ARM_SMCCC_VENDOR_HYP_FEATURES			\
+	GENMASK(KVM_REG_ARM_VENDOR_HYP_BMAP_BIT_COUNT - 1, 0)
+
+static void kvm_ptp_get_time(struct kvm_vcpu *vcpu, u64 *val)
+{
+	struct system_time_snapshot systime_snapshot;
+	u64 cycles = ~0UL;
+	u32 feature;
+
+	/*
+	 * system time and counter value must captured at the same
+	 * time to keep consistency and precision.
+	 */
+	ktime_get_snapshot(&systime_snapshot);
+
+	/*
+	 * This is only valid if the current clocksource is the
+	 * architected counter, as this is the only one the guest
+	 * can see.
+	 */
+	if (systime_snapshot.cs_id != CSID_ARM_ARCH_COUNTER)
+		return;
+
+	/*
+	 * The guest selects one of the two reference counters
+	 * (virtual or physical) with the first argument of the SMCCC
+	 * call. In case the identifier is not supported, error out.
+	 */
+	feature = smccc_get_arg1(vcpu);
+	switch (feature) {
+	case KVM_PTP_VIRT_COUNTER:
+		cycles = systime_snapshot.cycles - vcpu_read_sys_reg(vcpu, CNTVOFF_EL2);
+		break;
+	case KVM_PTP_PHYS_COUNTER:
+		cycles = systime_snapshot.cycles;
+		break;
+	default:
+		return;
+	}
+
+	/*
+	 * This relies on the top bit of val[0] never being set for
+	 * valid values of system time, because that is *really* far
+	 * in the future (about 292 years from 1970, and at that stage
+	 * nobody will give a damn about it).
+	 */
+	val[0] = upper_32_bits(systime_snapshot.real);
+	val[1] = lower_32_bits(systime_snapshot.real);
+	val[2] = upper_32_bits(cycles);
+	val[3] = lower_32_bits(cycles);
+}
+
+static bool kvm_hvc_call_default_allowed(u32 func_id)
+{
+	switch (func_id) {
+	/*
+	 * List of function-ids that are not gated with the bitmapped
+	 * feature firmware registers, and are to be allowed for
+	 * servicing the call by default.
+	 */
+	case ARM_SMCCC_VERSION_FUNC_ID:
+	case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
+		return true;
+	default:
+		/* PSCI 0.2 and up is in the 0:0x1f range */
+		if (ARM_SMCCC_OWNER_NUM(func_id) == ARM_SMCCC_OWNER_STANDARD &&
+		    ARM_SMCCC_FUNC_NUM(func_id) <= 0x1f)
+			return true;
+
+		/*
+		 * KVM's PSCI 0.1 doesn't comply with SMCCC, and has
+		 * its own function-id base and range
+		 */
+		if (func_id >= KVM_PSCI_FN(0) && func_id <= KVM_PSCI_FN(3))
+			return true;
+
+		return false;
+	}
+}
+
+static bool kvm_hvc_call_allowed(struct kvm_vcpu *vcpu, u32 func_id)
+{
+	struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
+
+	switch (func_id) {
+	case ARM_SMCCC_TRNG_VERSION:
+	case ARM_SMCCC_TRNG_FEATURES:
+	case ARM_SMCCC_TRNG_GET_UUID:
+	case ARM_SMCCC_TRNG_RND32:
+	case ARM_SMCCC_TRNG_RND64:
+		return test_bit(KVM_REG_ARM_STD_BIT_TRNG_V1_0,
+				&smccc_feat->std_bmap);
+	case ARM_SMCCC_HV_PV_TIME_FEATURES:
+	case ARM_SMCCC_HV_PV_TIME_ST:
+		return test_bit(KVM_REG_ARM_STD_HYP_BIT_PV_TIME,
+				&smccc_feat->std_hyp_bmap);
+	case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
+	case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:
+		return test_bit(KVM_REG_ARM_VENDOR_HYP_BIT_FUNC_FEAT,
+				&smccc_feat->vendor_hyp_bmap);
+	case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID:
+		return test_bit(KVM_REG_ARM_VENDOR_HYP_BIT_PTP,
+				&smccc_feat->vendor_hyp_bmap);
+	default:
+		return kvm_hvc_call_default_allowed(func_id);
+	}
+}
+
+int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
+{
+	struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
+	u32 func_id = smccc_get_function(vcpu);
+	u64 val[4] = {SMCCC_RET_NOT_SUPPORTED};
+	u32 feature;
+	gpa_t gpa;
+
+	if (!kvm_hvc_call_allowed(vcpu, func_id))
+		goto out;
+
+	switch (func_id) {
+	case ARM_SMCCC_VERSION_FUNC_ID:
+		val[0] = ARM_SMCCC_VERSION_1_1;
+		break;
+	case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
+		feature = smccc_get_arg1(vcpu);
+		switch (feature) {
+		case ARM_SMCCC_ARCH_WORKAROUND_1:
+			switch (arm64_get_spectre_v2_state()) {
+			case SPECTRE_VULNERABLE:
+				break;
+			case SPECTRE_MITIGATED:
+				val[0] = SMCCC_RET_SUCCESS;
+				break;
+			case SPECTRE_UNAFFECTED:
+				val[0] = SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED;
+				break;
+			}
+			break;
+		case ARM_SMCCC_ARCH_WORKAROUND_2:
+			switch (arm64_get_spectre_v4_state()) {
+			case SPECTRE_VULNERABLE:
+				break;
+			case SPECTRE_MITIGATED:
+				/*
+				 * SSBS everywhere: Indicate no firmware
+				 * support, as the SSBS support will be
+				 * indicated to the guest and the default is
+				 * safe.
+				 *
+				 * Otherwise, expose a permanent mitigation
+				 * to the guest, and hide SSBS so that the
+				 * guest stays protected.
+				 */
+				if (cpus_have_final_cap(ARM64_SSBS))
+					break;
+				fallthrough;
+			case SPECTRE_UNAFFECTED:
+				val[0] = SMCCC_RET_NOT_REQUIRED;
+				break;
+			}
+			break;
+		case ARM_SMCCC_ARCH_WORKAROUND_3:
+			switch (arm64_get_spectre_bhb_state()) {
+			case SPECTRE_VULNERABLE:
+				break;
+			case SPECTRE_MITIGATED:
+				val[0] = SMCCC_RET_SUCCESS;
+				break;
+			case SPECTRE_UNAFFECTED:
+				val[0] = SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED;
+				break;
+			}
+			break;
+		case ARM_SMCCC_HV_PV_TIME_FEATURES:
+			if (test_bit(KVM_REG_ARM_STD_HYP_BIT_PV_TIME,
+				     &smccc_feat->std_hyp_bmap))
+				val[0] = SMCCC_RET_SUCCESS;
+			break;
+		}
+		break;
+	case ARM_SMCCC_HV_PV_TIME_FEATURES:
+		val[0] = kvm_hypercall_pv_features(vcpu);
+		break;
+	case ARM_SMCCC_HV_PV_TIME_ST:
+		gpa = kvm_init_stolen_time(vcpu);
+		if (gpa != GPA_INVALID)
+			val[0] = gpa;
+		break;
+	case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:
+		val[0] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0;
+		val[1] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1;
+		val[2] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2;
+		val[3] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3;
+		break;
+	case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
+		val[0] = smccc_feat->vendor_hyp_bmap;
+		break;
+	case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID:
+		kvm_ptp_get_time(vcpu, val);
+		break;
+	case ARM_SMCCC_TRNG_VERSION:
+	case ARM_SMCCC_TRNG_FEATURES:
+	case ARM_SMCCC_TRNG_GET_UUID:
+	case ARM_SMCCC_TRNG_RND32:
+	case ARM_SMCCC_TRNG_RND64:
+		return kvm_trng_call(vcpu);
+	default:
+		return kvm_psci_call(vcpu);
+	}
+
+out:
+	smccc_set_retval(vcpu, val[0], val[1], val[2], val[3]);
+	return 1;
+}
+
+static const u64 kvm_arm_fw_reg_ids[] = {
+	KVM_REG_ARM_PSCI_VERSION,
+	KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1,
+	KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2,
+	KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3,
+	KVM_REG_ARM_STD_BMAP,
+	KVM_REG_ARM_STD_HYP_BMAP,
+	KVM_REG_ARM_VENDOR_HYP_BMAP,
+};
+
+void kvm_arm_init_hypercalls(struct kvm *kvm)
+{
+	struct kvm_smccc_features *smccc_feat = &kvm->arch.smccc_feat;
+
+	smccc_feat->std_bmap = KVM_ARM_SMCCC_STD_FEATURES;
+	smccc_feat->std_hyp_bmap = KVM_ARM_SMCCC_STD_HYP_FEATURES;
+	smccc_feat->vendor_hyp_bmap = KVM_ARM_SMCCC_VENDOR_HYP_FEATURES;
+}
+
+int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu)
+{
+	return ARRAY_SIZE(kvm_arm_fw_reg_ids);
+}
+
+int kvm_arm_copy_fw_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(kvm_arm_fw_reg_ids); i++) {
+		if (put_user(kvm_arm_fw_reg_ids[i], uindices++))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+#define KVM_REG_FEATURE_LEVEL_MASK	GENMASK(3, 0)
+
+/*
+ * Convert the workaround level into an easy-to-compare number, where higher
+ * values mean better protection.
+ */
+static int get_kernel_wa_level(u64 regid)
+{
+	switch (regid) {
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
+		switch (arm64_get_spectre_v2_state()) {
+		case SPECTRE_VULNERABLE:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL;
+		case SPECTRE_MITIGATED:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL;
+		case SPECTRE_UNAFFECTED:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED;
+		}
+		return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL;
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
+		switch (arm64_get_spectre_v4_state()) {
+		case SPECTRE_MITIGATED:
+			/*
+			 * As for the hypercall discovery, we pretend we
+			 * don't have any FW mitigation if SSBS is there at
+			 * all times.
+			 */
+			if (cpus_have_final_cap(ARM64_SSBS))
+				return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
+			fallthrough;
+		case SPECTRE_UNAFFECTED:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED;
+		case SPECTRE_VULNERABLE:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
+		}
+		break;
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
+		switch (arm64_get_spectre_bhb_state()) {
+		case SPECTRE_VULNERABLE:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_AVAIL;
+		case SPECTRE_MITIGATED:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_AVAIL;
+		case SPECTRE_UNAFFECTED:
+			return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_REQUIRED;
+		}
+		return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_AVAIL;
+	}
+
+	return -EINVAL;
+}
+
+int kvm_arm_get_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
+	void __user *uaddr = (void __user *)(long)reg->addr;
+	u64 val;
+
+	switch (reg->id) {
+	case KVM_REG_ARM_PSCI_VERSION:
+		val = kvm_psci_version(vcpu);
+		break;
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
+		val = get_kernel_wa_level(reg->id) & KVM_REG_FEATURE_LEVEL_MASK;
+		break;
+	case KVM_REG_ARM_STD_BMAP:
+		val = READ_ONCE(smccc_feat->std_bmap);
+		break;
+	case KVM_REG_ARM_STD_HYP_BMAP:
+		val = READ_ONCE(smccc_feat->std_hyp_bmap);
+		break;
+	case KVM_REG_ARM_VENDOR_HYP_BMAP:
+		val = READ_ONCE(smccc_feat->vendor_hyp_bmap);
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	if (copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int kvm_arm_set_fw_reg_bmap(struct kvm_vcpu *vcpu, u64 reg_id, u64 val)
+{
+	int ret = 0;
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_smccc_features *smccc_feat = &kvm->arch.smccc_feat;
+	unsigned long *fw_reg_bmap, fw_reg_features;
+
+	switch (reg_id) {
+	case KVM_REG_ARM_STD_BMAP:
+		fw_reg_bmap = &smccc_feat->std_bmap;
+		fw_reg_features = KVM_ARM_SMCCC_STD_FEATURES;
+		break;
+	case KVM_REG_ARM_STD_HYP_BMAP:
+		fw_reg_bmap = &smccc_feat->std_hyp_bmap;
+		fw_reg_features = KVM_ARM_SMCCC_STD_HYP_FEATURES;
+		break;
+	case KVM_REG_ARM_VENDOR_HYP_BMAP:
+		fw_reg_bmap = &smccc_feat->vendor_hyp_bmap;
+		fw_reg_features = KVM_ARM_SMCCC_VENDOR_HYP_FEATURES;
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	/* Check for unsupported bit */
+	if (val & ~fw_reg_features)
+		return -EINVAL;
+
+	mutex_lock(&kvm->arch.config_lock);
+
+	if (test_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags) &&
+	    val != *fw_reg_bmap) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	WRITE_ONCE(*fw_reg_bmap, val);
+out:
+	mutex_unlock(&kvm->arch.config_lock);
+	return ret;
+}
+
+int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	void __user *uaddr = (void __user *)(long)reg->addr;
+	u64 val;
+	int wa_level;
+
+	if (KVM_REG_SIZE(reg->id) != sizeof(val))
+		return -ENOENT;
+	if (copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)))
+		return -EFAULT;
+
+	switch (reg->id) {
+	case KVM_REG_ARM_PSCI_VERSION:
+	{
+		bool wants_02;
+
+		wants_02 = test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features);
+
+		switch (val) {
+		case KVM_ARM_PSCI_0_1:
+			if (wants_02)
+				return -EINVAL;
+			vcpu->kvm->arch.psci_version = val;
+			return 0;
+		case KVM_ARM_PSCI_0_2:
+		case KVM_ARM_PSCI_1_0:
+		case KVM_ARM_PSCI_1_1:
+			if (!wants_02)
+				return -EINVAL;
+			vcpu->kvm->arch.psci_version = val;
+			return 0;
+		}
+		break;
+	}
+
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
+		if (val & ~KVM_REG_FEATURE_LEVEL_MASK)
+			return -EINVAL;
+
+		if (get_kernel_wa_level(reg->id) < val)
+			return -EINVAL;
+
+		return 0;
+
+	case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
+		if (val & ~(KVM_REG_FEATURE_LEVEL_MASK |
+			    KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED))
+			return -EINVAL;
+
+		/* The enabled bit must not be set unless the level is AVAIL. */
+		if ((val & KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED) &&
+		    (val & KVM_REG_FEATURE_LEVEL_MASK) != KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL)
+			return -EINVAL;
+
+		/*
+		 * Map all the possible incoming states to the only two we
+		 * really want to deal with.
+		 */
+		switch (val & KVM_REG_FEATURE_LEVEL_MASK) {
+		case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL:
+		case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN:
+			wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
+			break;
+		case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL:
+		case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED:
+			wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		/*
+		 * We can deal with NOT_AVAIL on NOT_REQUIRED, but not the
+		 * other way around.
+		 */
+		if (get_kernel_wa_level(reg->id) < wa_level)
+			return -EINVAL;
+
+		return 0;
+	case KVM_REG_ARM_STD_BMAP:
+	case KVM_REG_ARM_STD_HYP_BMAP:
+	case KVM_REG_ARM_VENDOR_HYP_BMAP:
+		return kvm_arm_set_fw_reg_bmap(vcpu, reg->id, val);
+	default:
+		return -ENOENT;
+	}
+
+	return -EINVAL;
+}
diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
new file mode 100644
index 000000000..f32f4a2a3
--- /dev/null
+++ b/arch/arm64/kvm/inject_fault.c
@@ -0,0 +1,205 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Fault injection for both 32 and 64bit guests.
+ *
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Based on arch/arm/kvm/emulate.c
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/esr.h>
+
+static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr)
+{
+	unsigned long cpsr = *vcpu_cpsr(vcpu);
+	bool is_aarch32 = vcpu_mode_is_32bit(vcpu);
+	u64 esr = 0;
+
+	kvm_pend_exception(vcpu, EXCEPT_AA64_EL1_SYNC);
+
+	vcpu_write_sys_reg(vcpu, addr, FAR_EL1);
+
+	/*
+	 * Build an {i,d}abort, depending on the level and the
+	 * instruction set. Report an external synchronous abort.
+	 */
+	if (kvm_vcpu_trap_il_is32bit(vcpu))
+		esr |= ESR_ELx_IL;
+
+	/*
+	 * Here, the guest runs in AArch64 mode when in EL1. If we get
+	 * an AArch32 fault, it means we managed to trap an EL0 fault.
+	 */
+	if (is_aarch32 || (cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t)
+		esr |= (ESR_ELx_EC_IABT_LOW << ESR_ELx_EC_SHIFT);
+	else
+		esr |= (ESR_ELx_EC_IABT_CUR << ESR_ELx_EC_SHIFT);
+
+	if (!is_iabt)
+		esr |= ESR_ELx_EC_DABT_LOW << ESR_ELx_EC_SHIFT;
+
+	vcpu_write_sys_reg(vcpu, esr | ESR_ELx_FSC_EXTABT, ESR_EL1);
+}
+
+static void inject_undef64(struct kvm_vcpu *vcpu)
+{
+	u64 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);
+
+	kvm_pend_exception(vcpu, EXCEPT_AA64_EL1_SYNC);
+
+	/*
+	 * Build an unknown exception, depending on the instruction
+	 * set.
+	 */
+	if (kvm_vcpu_trap_il_is32bit(vcpu))
+		esr |= ESR_ELx_IL;
+
+	vcpu_write_sys_reg(vcpu, esr, ESR_EL1);
+}
+
+#define DFSR_FSC_EXTABT_LPAE	0x10
+#define DFSR_FSC_EXTABT_nLPAE	0x08
+#define DFSR_LPAE		BIT(9)
+#define TTBCR_EAE		BIT(31)
+
+static void inject_undef32(struct kvm_vcpu *vcpu)
+{
+	kvm_pend_exception(vcpu, EXCEPT_AA32_UND);
+}
+
+/*
+ * Modelled after TakeDataAbortException() and TakePrefetchAbortException
+ * pseudocode.
+ */
+static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt, u32 addr)
+{
+	u64 far;
+	u32 fsr;
+
+	/* Give the guest an IMPLEMENTATION DEFINED exception */
+	if (vcpu_read_sys_reg(vcpu, TCR_EL1) & TTBCR_EAE) {
+		fsr = DFSR_LPAE | DFSR_FSC_EXTABT_LPAE;
+	} else {
+		/* no need to shuffle FS[4] into DFSR[10] as its 0 */
+		fsr = DFSR_FSC_EXTABT_nLPAE;
+	}
+
+	far = vcpu_read_sys_reg(vcpu, FAR_EL1);
+
+	if (is_pabt) {
+		kvm_pend_exception(vcpu, EXCEPT_AA32_IABT);
+		far &= GENMASK(31, 0);
+		far |= (u64)addr << 32;
+		vcpu_write_sys_reg(vcpu, fsr, IFSR32_EL2);
+	} else { /* !iabt */
+		kvm_pend_exception(vcpu, EXCEPT_AA32_DABT);
+		far &= GENMASK(63, 32);
+		far |= addr;
+		vcpu_write_sys_reg(vcpu, fsr, ESR_EL1);
+	}
+
+	vcpu_write_sys_reg(vcpu, far, FAR_EL1);
+}
+
+/**
+ * kvm_inject_dabt - inject a data abort into the guest
+ * @vcpu: The VCPU to receive the data abort
+ * @addr: The address to report in the DFAR
+ *
+ * It is assumed that this code is called from the VCPU thread and that the
+ * VCPU therefore is not currently executing guest code.
+ */
+void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
+{
+	if (vcpu_el1_is_32bit(vcpu))
+		inject_abt32(vcpu, false, addr);
+	else
+		inject_abt64(vcpu, false, addr);
+}
+
+/**
+ * kvm_inject_pabt - inject a prefetch abort into the guest
+ * @vcpu: The VCPU to receive the prefetch abort
+ * @addr: The address to report in the DFAR
+ *
+ * It is assumed that this code is called from the VCPU thread and that the
+ * VCPU therefore is not currently executing guest code.
+ */
+void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
+{
+	if (vcpu_el1_is_32bit(vcpu))
+		inject_abt32(vcpu, true, addr);
+	else
+		inject_abt64(vcpu, true, addr);
+}
+
+void kvm_inject_size_fault(struct kvm_vcpu *vcpu)
+{
+	unsigned long addr, esr;
+
+	addr  = kvm_vcpu_get_fault_ipa(vcpu);
+	addr |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0);
+
+	if (kvm_vcpu_trap_is_iabt(vcpu))
+		kvm_inject_pabt(vcpu, addr);
+	else
+		kvm_inject_dabt(vcpu, addr);
+
+	/*
+	 * If AArch64 or LPAE, set FSC to 0 to indicate an Address
+	 * Size Fault at level 0, as if exceeding PARange.
+	 *
+	 * Non-LPAE guests will only get the external abort, as there
+	 * is no way to to describe the ASF.
+	 */
+	if (vcpu_el1_is_32bit(vcpu) &&
+	    !(vcpu_read_sys_reg(vcpu, TCR_EL1) & TTBCR_EAE))
+		return;
+
+	esr = vcpu_read_sys_reg(vcpu, ESR_EL1);
+	esr &= ~GENMASK_ULL(5, 0);
+	vcpu_write_sys_reg(vcpu, esr, ESR_EL1);
+}
+
+/**
+ * kvm_inject_undefined - inject an undefined instruction into the guest
+ * @vcpu: The vCPU in which to inject the exception
+ *
+ * It is assumed that this code is called from the VCPU thread and that the
+ * VCPU therefore is not currently executing guest code.
+ */
+void kvm_inject_undefined(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_el1_is_32bit(vcpu))
+		inject_undef32(vcpu);
+	else
+		inject_undef64(vcpu);
+}
+
+void kvm_set_sei_esr(struct kvm_vcpu *vcpu, u64 esr)
+{
+	vcpu_set_vsesr(vcpu, esr & ESR_ELx_ISS_MASK);
+	*vcpu_hcr(vcpu) |= HCR_VSE;
+}
+
+/**
+ * kvm_inject_vabt - inject an async abort / SError into the guest
+ * @vcpu: The VCPU to receive the exception
+ *
+ * It is assumed that this code is called from the VCPU thread and that the
+ * VCPU therefore is not currently executing guest code.
+ *
+ * Systems with the RAS Extensions specify an imp-def ESR (ISV/IDS = 1) with
+ * the remaining ISS all-zeros so that this error is not interpreted as an
+ * uncategorized RAS error. Without the RAS Extensions we can't specify an ESR
+ * value, so the CPU generates an imp-def value.
+ */
+void kvm_inject_vabt(struct kvm_vcpu *vcpu)
+{
+	kvm_set_sei_esr(vcpu, ESR_ELx_ISV);
+}
diff --git a/arch/arm64/kvm/irq.h b/arch/arm64/kvm/irq.h
new file mode 100644
index 000000000..0d257de42
--- /dev/null
+++ b/arch/arm64/kvm/irq.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * irq.h: in kernel interrupt controller related definitions
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * This header is included by irqchip.c. However, on ARM, interrupt
+ * controller declarations are located in include/kvm/arm_vgic.h since
+ * they are mostly shared between arm and arm64.
+ */
+
+#ifndef __IRQ_H
+#define __IRQ_H
+
+#include <kvm/arm_vgic.h>
+
+#endif
diff --git a/arch/arm64/kvm/mmio.c b/arch/arm64/kvm/mmio.c
new file mode 100644
index 000000000..3dd38a151
--- /dev/null
+++ b/arch/arm64/kvm/mmio.c
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <trace/events/kvm.h>
+
+#include "trace.h"
+
+void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data)
+{
+	void *datap = NULL;
+	union {
+		u8	byte;
+		u16	hword;
+		u32	word;
+		u64	dword;
+	} tmp;
+
+	switch (len) {
+	case 1:
+		tmp.byte	= data;
+		datap		= &tmp.byte;
+		break;
+	case 2:
+		tmp.hword	= data;
+		datap		= &tmp.hword;
+		break;
+	case 4:
+		tmp.word	= data;
+		datap		= &tmp.word;
+		break;
+	case 8:
+		tmp.dword	= data;
+		datap		= &tmp.dword;
+		break;
+	}
+
+	memcpy(buf, datap, len);
+}
+
+unsigned long kvm_mmio_read_buf(const void *buf, unsigned int len)
+{
+	unsigned long data = 0;
+	union {
+		u16	hword;
+		u32	word;
+		u64	dword;
+	} tmp;
+
+	switch (len) {
+	case 1:
+		data = *(u8 *)buf;
+		break;
+	case 2:
+		memcpy(&tmp.hword, buf, len);
+		data = tmp.hword;
+		break;
+	case 4:
+		memcpy(&tmp.word, buf, len);
+		data = tmp.word;
+		break;
+	case 8:
+		memcpy(&tmp.dword, buf, len);
+		data = tmp.dword;
+		break;
+	}
+
+	return data;
+}
+
+/**
+ * kvm_handle_mmio_return -- Handle MMIO loads after user space emulation
+ *			     or in-kernel IO emulation
+ *
+ * @vcpu: The VCPU pointer
+ */
+int kvm_handle_mmio_return(struct kvm_vcpu *vcpu)
+{
+	unsigned long data;
+	unsigned int len;
+	int mask;
+
+	/* Detect an already handled MMIO return */
+	if (unlikely(!vcpu->mmio_needed))
+		return 0;
+
+	vcpu->mmio_needed = 0;
+
+	if (!kvm_vcpu_dabt_iswrite(vcpu)) {
+		struct kvm_run *run = vcpu->run;
+
+		len = kvm_vcpu_dabt_get_as(vcpu);
+		data = kvm_mmio_read_buf(run->mmio.data, len);
+
+		if (kvm_vcpu_dabt_issext(vcpu) &&
+		    len < sizeof(unsigned long)) {
+			mask = 1U << ((len * 8) - 1);
+			data = (data ^ mask) - mask;
+		}
+
+		if (!kvm_vcpu_dabt_issf(vcpu))
+			data = data & 0xffffffff;
+
+		trace_kvm_mmio(KVM_TRACE_MMIO_READ, len, run->mmio.phys_addr,
+			       &data);
+		data = vcpu_data_host_to_guest(vcpu, data, len);
+		vcpu_set_reg(vcpu, kvm_vcpu_dabt_get_rd(vcpu), data);
+	}
+
+	/*
+	 * The MMIO instruction is emulated and should not be re-executed
+	 * in the guest.
+	 */
+	kvm_incr_pc(vcpu);
+
+	return 0;
+}
+
+int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
+{
+	struct kvm_run *run = vcpu->run;
+	unsigned long data;
+	unsigned long rt;
+	int ret;
+	bool is_write;
+	int len;
+	u8 data_buf[8];
+
+	/*
+	 * No valid syndrome? Ask userspace for help if it has
+	 * volunteered to do so, and bail out otherwise.
+	 */
+	if (!kvm_vcpu_dabt_isvalid(vcpu)) {
+		if (test_bit(KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER,
+			     &vcpu->kvm->arch.flags)) {
+			run->exit_reason = KVM_EXIT_ARM_NISV;
+			run->arm_nisv.esr_iss = kvm_vcpu_dabt_iss_nisv_sanitized(vcpu);
+			run->arm_nisv.fault_ipa = fault_ipa;
+			return 0;
+		}
+
+		kvm_pr_unimpl("Data abort outside memslots with no valid syndrome info\n");
+		return -ENOSYS;
+	}
+
+	/*
+	 * Prepare MMIO operation. First decode the syndrome data we get
+	 * from the CPU. Then try if some in-kernel emulation feels
+	 * responsible, otherwise let user space do its magic.
+	 */
+	is_write = kvm_vcpu_dabt_iswrite(vcpu);
+	len = kvm_vcpu_dabt_get_as(vcpu);
+	rt = kvm_vcpu_dabt_get_rd(vcpu);
+
+	if (is_write) {
+		data = vcpu_data_guest_to_host(vcpu, vcpu_get_reg(vcpu, rt),
+					       len);
+
+		trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, len, fault_ipa, &data);
+		kvm_mmio_write_buf(data_buf, len, data);
+
+		ret = kvm_io_bus_write(vcpu, KVM_MMIO_BUS, fault_ipa, len,
+				       data_buf);
+	} else {
+		trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, len,
+			       fault_ipa, NULL);
+
+		ret = kvm_io_bus_read(vcpu, KVM_MMIO_BUS, fault_ipa, len,
+				      data_buf);
+	}
+
+	/* Now prepare kvm_run for the potential return to userland. */
+	run->mmio.is_write	= is_write;
+	run->mmio.phys_addr	= fault_ipa;
+	run->mmio.len		= len;
+	vcpu->mmio_needed	= 1;
+
+	if (!ret) {
+		/* We handled the access successfully in the kernel. */
+		if (!is_write)
+			memcpy(run->mmio.data, data_buf, len);
+		vcpu->stat.mmio_exit_kernel++;
+		kvm_handle_mmio_return(vcpu);
+		return 1;
+	}
+
+	if (is_write)
+		memcpy(run->mmio.data, data_buf, len);
+	vcpu->stat.mmio_exit_user++;
+	run->exit_reason	= KVM_EXIT_MMIO;
+	return 0;
+}
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
new file mode 100644
index 000000000..54ccdcc2d
--- /dev/null
+++ b/arch/arm64/kvm/mmu.c
@@ -0,0 +1,1883 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/mman.h>
+#include <linux/kvm_host.h>
+#include <linux/io.h>
+#include <linux/hugetlb.h>
+#include <linux/sched/signal.h>
+#include <trace/events/kvm.h>
+#include <asm/pgalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_pgtable.h>
+#include <asm/kvm_ras.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/virt.h>
+
+#include "trace.h"
+
+static struct kvm_pgtable *hyp_pgtable;
+static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
+
+static unsigned long hyp_idmap_start;
+static unsigned long hyp_idmap_end;
+static phys_addr_t hyp_idmap_vector;
+
+static unsigned long io_map_base;
+
+static phys_addr_t stage2_range_addr_end(phys_addr_t addr, phys_addr_t end)
+{
+	phys_addr_t size = kvm_granule_size(KVM_PGTABLE_MIN_BLOCK_LEVEL);
+	phys_addr_t boundary = ALIGN_DOWN(addr + size, size);
+
+	return (boundary - 1 < end - 1) ? boundary : end;
+}
+
+/*
+ * Release kvm_mmu_lock periodically if the memory region is large. Otherwise,
+ * we may see kernel panics with CONFIG_DETECT_HUNG_TASK,
+ * CONFIG_LOCKUP_DETECTOR, CONFIG_LOCKDEP. Additionally, holding the lock too
+ * long will also starve other vCPUs. We have to also make sure that the page
+ * tables are not freed while we released the lock.
+ */
+static int stage2_apply_range(struct kvm *kvm, phys_addr_t addr,
+			      phys_addr_t end,
+			      int (*fn)(struct kvm_pgtable *, u64, u64),
+			      bool resched)
+{
+	int ret;
+	u64 next;
+
+	do {
+		struct kvm_pgtable *pgt = kvm->arch.mmu.pgt;
+		if (!pgt)
+			return -EINVAL;
+
+		next = stage2_range_addr_end(addr, end);
+		ret = fn(pgt, addr, next - addr);
+		if (ret)
+			break;
+
+		if (resched && next != end)
+			cond_resched_rwlock_write(&kvm->mmu_lock);
+	} while (addr = next, addr != end);
+
+	return ret;
+}
+
+#define stage2_apply_range_resched(kvm, addr, end, fn)			\
+	stage2_apply_range(kvm, addr, end, fn, true)
+
+static bool memslot_is_logging(struct kvm_memory_slot *memslot)
+{
+	return memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY);
+}
+
+/**
+ * kvm_flush_remote_tlbs() - flush all VM TLB entries for v7/8
+ * @kvm:	pointer to kvm structure.
+ *
+ * Interface to HYP function to flush all VM TLB entries
+ */
+void kvm_flush_remote_tlbs(struct kvm *kvm)
+{
+	++kvm->stat.generic.remote_tlb_flush_requests;
+	kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu);
+}
+
+static bool kvm_is_device_pfn(unsigned long pfn)
+{
+	return !pfn_is_map_memory(pfn);
+}
+
+static void *stage2_memcache_zalloc_page(void *arg)
+{
+	struct kvm_mmu_memory_cache *mc = arg;
+	void *virt;
+
+	/* Allocated with __GFP_ZERO, so no need to zero */
+	virt = kvm_mmu_memory_cache_alloc(mc);
+	if (virt)
+		kvm_account_pgtable_pages(virt, 1);
+	return virt;
+}
+
+static void *kvm_host_zalloc_pages_exact(size_t size)
+{
+	return alloc_pages_exact(size, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
+}
+
+static void *kvm_s2_zalloc_pages_exact(size_t size)
+{
+	void *virt = kvm_host_zalloc_pages_exact(size);
+
+	if (virt)
+		kvm_account_pgtable_pages(virt, (size >> PAGE_SHIFT));
+	return virt;
+}
+
+static void kvm_s2_free_pages_exact(void *virt, size_t size)
+{
+	kvm_account_pgtable_pages(virt, -(size >> PAGE_SHIFT));
+	free_pages_exact(virt, size);
+}
+
+static void kvm_host_get_page(void *addr)
+{
+	get_page(virt_to_page(addr));
+}
+
+static void kvm_host_put_page(void *addr)
+{
+	put_page(virt_to_page(addr));
+}
+
+static void kvm_s2_put_page(void *addr)
+{
+	struct page *p = virt_to_page(addr);
+	/* Dropping last refcount, the page will be freed */
+	if (page_count(p) == 1)
+		kvm_account_pgtable_pages(addr, -1);
+	put_page(p);
+}
+
+static int kvm_host_page_count(void *addr)
+{
+	return page_count(virt_to_page(addr));
+}
+
+static phys_addr_t kvm_host_pa(void *addr)
+{
+	return __pa(addr);
+}
+
+static void *kvm_host_va(phys_addr_t phys)
+{
+	return __va(phys);
+}
+
+static void clean_dcache_guest_page(void *va, size_t size)
+{
+	__clean_dcache_guest_page(va, size);
+}
+
+static void invalidate_icache_guest_page(void *va, size_t size)
+{
+	__invalidate_icache_guest_page(va, size);
+}
+
+/*
+ * Unmapping vs dcache management:
+ *
+ * If a guest maps certain memory pages as uncached, all writes will
+ * bypass the data cache and go directly to RAM.  However, the CPUs
+ * can still speculate reads (not writes) and fill cache lines with
+ * data.
+ *
+ * Those cache lines will be *clean* cache lines though, so a
+ * clean+invalidate operation is equivalent to an invalidate
+ * operation, because no cache lines are marked dirty.
+ *
+ * Those clean cache lines could be filled prior to an uncached write
+ * by the guest, and the cache coherent IO subsystem would therefore
+ * end up writing old data to disk.
+ *
+ * This is why right after unmapping a page/section and invalidating
+ * the corresponding TLBs, we flush to make sure the IO subsystem will
+ * never hit in the cache.
+ *
+ * This is all avoided on systems that have ARM64_HAS_STAGE2_FWB, as
+ * we then fully enforce cacheability of RAM, no matter what the guest
+ * does.
+ */
+/**
+ * unmap_stage2_range -- Clear stage2 page table entries to unmap a range
+ * @mmu:   The KVM stage-2 MMU pointer
+ * @start: The intermediate physical base address of the range to unmap
+ * @size:  The size of the area to unmap
+ * @may_block: Whether or not we are permitted to block
+ *
+ * Clear a range of stage-2 mappings, lowering the various ref-counts.  Must
+ * be called while holding mmu_lock (unless for freeing the stage2 pgd before
+ * destroying the VM), otherwise another faulting VCPU may come in and mess
+ * with things behind our backs.
+ */
+static void __unmap_stage2_range(struct kvm_s2_mmu *mmu, phys_addr_t start, u64 size,
+				 bool may_block)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(mmu);
+	phys_addr_t end = start + size;
+
+	lockdep_assert_held_write(&kvm->mmu_lock);
+	WARN_ON(size & ~PAGE_MASK);
+	WARN_ON(stage2_apply_range(kvm, start, end, kvm_pgtable_stage2_unmap,
+				   may_block));
+}
+
+static void unmap_stage2_range(struct kvm_s2_mmu *mmu, phys_addr_t start, u64 size)
+{
+	__unmap_stage2_range(mmu, start, size, true);
+}
+
+static void stage2_flush_memslot(struct kvm *kvm,
+				 struct kvm_memory_slot *memslot)
+{
+	phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT;
+	phys_addr_t end = addr + PAGE_SIZE * memslot->npages;
+
+	stage2_apply_range_resched(kvm, addr, end, kvm_pgtable_stage2_flush);
+}
+
+/**
+ * stage2_flush_vm - Invalidate cache for pages mapped in stage 2
+ * @kvm: The struct kvm pointer
+ *
+ * Go through the stage 2 page tables and invalidate any cache lines
+ * backing memory already mapped to the VM.
+ */
+static void stage2_flush_vm(struct kvm *kvm)
+{
+	struct kvm_memslots *slots;
+	struct kvm_memory_slot *memslot;
+	int idx, bkt;
+
+	idx = srcu_read_lock(&kvm->srcu);
+	write_lock(&kvm->mmu_lock);
+
+	slots = kvm_memslots(kvm);
+	kvm_for_each_memslot(memslot, bkt, slots)
+		stage2_flush_memslot(kvm, memslot);
+
+	write_unlock(&kvm->mmu_lock);
+	srcu_read_unlock(&kvm->srcu, idx);
+}
+
+/**
+ * free_hyp_pgds - free Hyp-mode page tables
+ */
+void free_hyp_pgds(void)
+{
+	mutex_lock(&kvm_hyp_pgd_mutex);
+	if (hyp_pgtable) {
+		kvm_pgtable_hyp_destroy(hyp_pgtable);
+		kfree(hyp_pgtable);
+		hyp_pgtable = NULL;
+	}
+	mutex_unlock(&kvm_hyp_pgd_mutex);
+}
+
+static bool kvm_host_owns_hyp_mappings(void)
+{
+	if (is_kernel_in_hyp_mode())
+		return false;
+
+	if (static_branch_likely(&kvm_protected_mode_initialized))
+		return false;
+
+	/*
+	 * This can happen at boot time when __create_hyp_mappings() is called
+	 * after the hyp protection has been enabled, but the static key has
+	 * not been flipped yet.
+	 */
+	if (!hyp_pgtable && is_protected_kvm_enabled())
+		return false;
+
+	WARN_ON(!hyp_pgtable);
+
+	return true;
+}
+
+int __create_hyp_mappings(unsigned long start, unsigned long size,
+			  unsigned long phys, enum kvm_pgtable_prot prot)
+{
+	int err;
+
+	if (WARN_ON(!kvm_host_owns_hyp_mappings()))
+		return -EINVAL;
+
+	mutex_lock(&kvm_hyp_pgd_mutex);
+	err = kvm_pgtable_hyp_map(hyp_pgtable, start, size, phys, prot);
+	mutex_unlock(&kvm_hyp_pgd_mutex);
+
+	return err;
+}
+
+static phys_addr_t kvm_kaddr_to_phys(void *kaddr)
+{
+	if (!is_vmalloc_addr(kaddr)) {
+		BUG_ON(!virt_addr_valid(kaddr));
+		return __pa(kaddr);
+	} else {
+		return page_to_phys(vmalloc_to_page(kaddr)) +
+		       offset_in_page(kaddr);
+	}
+}
+
+struct hyp_shared_pfn {
+	u64 pfn;
+	int count;
+	struct rb_node node;
+};
+
+static DEFINE_MUTEX(hyp_shared_pfns_lock);
+static struct rb_root hyp_shared_pfns = RB_ROOT;
+
+static struct hyp_shared_pfn *find_shared_pfn(u64 pfn, struct rb_node ***node,
+					      struct rb_node **parent)
+{
+	struct hyp_shared_pfn *this;
+
+	*node = &hyp_shared_pfns.rb_node;
+	*parent = NULL;
+	while (**node) {
+		this = container_of(**node, struct hyp_shared_pfn, node);
+		*parent = **node;
+		if (this->pfn < pfn)
+			*node = &((**node)->rb_left);
+		else if (this->pfn > pfn)
+			*node = &((**node)->rb_right);
+		else
+			return this;
+	}
+
+	return NULL;
+}
+
+static int share_pfn_hyp(u64 pfn)
+{
+	struct rb_node **node, *parent;
+	struct hyp_shared_pfn *this;
+	int ret = 0;
+
+	mutex_lock(&hyp_shared_pfns_lock);
+	this = find_shared_pfn(pfn, &node, &parent);
+	if (this) {
+		this->count++;
+		goto unlock;
+	}
+
+	this = kzalloc(sizeof(*this), GFP_KERNEL);
+	if (!this) {
+		ret = -ENOMEM;
+		goto unlock;
+	}
+
+	this->pfn = pfn;
+	this->count = 1;
+	rb_link_node(&this->node, parent, node);
+	rb_insert_color(&this->node, &hyp_shared_pfns);
+	ret = kvm_call_hyp_nvhe(__pkvm_host_share_hyp, pfn, 1);
+unlock:
+	mutex_unlock(&hyp_shared_pfns_lock);
+
+	return ret;
+}
+
+static int unshare_pfn_hyp(u64 pfn)
+{
+	struct rb_node **node, *parent;
+	struct hyp_shared_pfn *this;
+	int ret = 0;
+
+	mutex_lock(&hyp_shared_pfns_lock);
+	this = find_shared_pfn(pfn, &node, &parent);
+	if (WARN_ON(!this)) {
+		ret = -ENOENT;
+		goto unlock;
+	}
+
+	this->count--;
+	if (this->count)
+		goto unlock;
+
+	rb_erase(&this->node, &hyp_shared_pfns);
+	kfree(this);
+	ret = kvm_call_hyp_nvhe(__pkvm_host_unshare_hyp, pfn, 1);
+unlock:
+	mutex_unlock(&hyp_shared_pfns_lock);
+
+	return ret;
+}
+
+int kvm_share_hyp(void *from, void *to)
+{
+	phys_addr_t start, end, cur;
+	u64 pfn;
+	int ret;
+
+	if (is_kernel_in_hyp_mode())
+		return 0;
+
+	/*
+	 * The share hcall maps things in the 'fixed-offset' region of the hyp
+	 * VA space, so we can only share physically contiguous data-structures
+	 * for now.
+	 */
+	if (is_vmalloc_or_module_addr(from) || is_vmalloc_or_module_addr(to))
+		return -EINVAL;
+
+	if (kvm_host_owns_hyp_mappings())
+		return create_hyp_mappings(from, to, PAGE_HYP);
+
+	start = ALIGN_DOWN(__pa(from), PAGE_SIZE);
+	end = PAGE_ALIGN(__pa(to));
+	for (cur = start; cur < end; cur += PAGE_SIZE) {
+		pfn = __phys_to_pfn(cur);
+		ret = share_pfn_hyp(pfn);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void kvm_unshare_hyp(void *from, void *to)
+{
+	phys_addr_t start, end, cur;
+	u64 pfn;
+
+	if (is_kernel_in_hyp_mode() || kvm_host_owns_hyp_mappings() || !from)
+		return;
+
+	start = ALIGN_DOWN(__pa(from), PAGE_SIZE);
+	end = PAGE_ALIGN(__pa(to));
+	for (cur = start; cur < end; cur += PAGE_SIZE) {
+		pfn = __phys_to_pfn(cur);
+		WARN_ON(unshare_pfn_hyp(pfn));
+	}
+}
+
+/**
+ * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode
+ * @from:	The virtual kernel start address of the range
+ * @to:		The virtual kernel end address of the range (exclusive)
+ * @prot:	The protection to be applied to this range
+ *
+ * The same virtual address as the kernel virtual address is also used
+ * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying
+ * physical pages.
+ */
+int create_hyp_mappings(void *from, void *to, enum kvm_pgtable_prot prot)
+{
+	phys_addr_t phys_addr;
+	unsigned long virt_addr;
+	unsigned long start = kern_hyp_va((unsigned long)from);
+	unsigned long end = kern_hyp_va((unsigned long)to);
+
+	if (is_kernel_in_hyp_mode())
+		return 0;
+
+	if (!kvm_host_owns_hyp_mappings())
+		return -EPERM;
+
+	start = start & PAGE_MASK;
+	end = PAGE_ALIGN(end);
+
+	for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) {
+		int err;
+
+		phys_addr = kvm_kaddr_to_phys(from + virt_addr - start);
+		err = __create_hyp_mappings(virt_addr, PAGE_SIZE, phys_addr,
+					    prot);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+
+/**
+ * hyp_alloc_private_va_range - Allocates a private VA range.
+ * @size:	The size of the VA range to reserve.
+ * @haddr:	The hypervisor virtual start address of the allocation.
+ *
+ * The private virtual address (VA) range is allocated below io_map_base
+ * and aligned based on the order of @size.
+ *
+ * Return: 0 on success or negative error code on failure.
+ */
+int hyp_alloc_private_va_range(size_t size, unsigned long *haddr)
+{
+	unsigned long base;
+	int ret = 0;
+
+	mutex_lock(&kvm_hyp_pgd_mutex);
+
+	/*
+	 * This assumes that we have enough space below the idmap
+	 * page to allocate our VAs. If not, the check below will
+	 * kick. A potential alternative would be to detect that
+	 * overflow and switch to an allocation above the idmap.
+	 *
+	 * The allocated size is always a multiple of PAGE_SIZE.
+	 */
+	base = io_map_base - PAGE_ALIGN(size);
+
+	/* Align the allocation based on the order of its size */
+	base = ALIGN_DOWN(base, PAGE_SIZE << get_order(size));
+
+	/*
+	 * Verify that BIT(VA_BITS - 1) hasn't been flipped by
+	 * allocating the new area, as it would indicate we've
+	 * overflowed the idmap/IO address range.
+	 */
+	if ((base ^ io_map_base) & BIT(VA_BITS - 1))
+		ret = -ENOMEM;
+	else
+		*haddr = io_map_base = base;
+
+	mutex_unlock(&kvm_hyp_pgd_mutex);
+
+	return ret;
+}
+
+static int __create_hyp_private_mapping(phys_addr_t phys_addr, size_t size,
+					unsigned long *haddr,
+					enum kvm_pgtable_prot prot)
+{
+	unsigned long addr;
+	int ret = 0;
+
+	if (!kvm_host_owns_hyp_mappings()) {
+		addr = kvm_call_hyp_nvhe(__pkvm_create_private_mapping,
+					 phys_addr, size, prot);
+		if (IS_ERR_VALUE(addr))
+			return addr;
+		*haddr = addr;
+
+		return 0;
+	}
+
+	size = PAGE_ALIGN(size + offset_in_page(phys_addr));
+	ret = hyp_alloc_private_va_range(size, &addr);
+	if (ret)
+		return ret;
+
+	ret = __create_hyp_mappings(addr, size, phys_addr, prot);
+	if (ret)
+		return ret;
+
+	*haddr = addr + offset_in_page(phys_addr);
+	return ret;
+}
+
+/**
+ * create_hyp_io_mappings - Map IO into both kernel and HYP
+ * @phys_addr:	The physical start address which gets mapped
+ * @size:	Size of the region being mapped
+ * @kaddr:	Kernel VA for this mapping
+ * @haddr:	HYP VA for this mapping
+ */
+int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size,
+			   void __iomem **kaddr,
+			   void __iomem **haddr)
+{
+	unsigned long addr;
+	int ret;
+
+	if (is_protected_kvm_enabled())
+		return -EPERM;
+
+	*kaddr = ioremap(phys_addr, size);
+	if (!*kaddr)
+		return -ENOMEM;
+
+	if (is_kernel_in_hyp_mode()) {
+		*haddr = *kaddr;
+		return 0;
+	}
+
+	ret = __create_hyp_private_mapping(phys_addr, size,
+					   &addr, PAGE_HYP_DEVICE);
+	if (ret) {
+		iounmap(*kaddr);
+		*kaddr = NULL;
+		*haddr = NULL;
+		return ret;
+	}
+
+	*haddr = (void __iomem *)addr;
+	return 0;
+}
+
+/**
+ * create_hyp_exec_mappings - Map an executable range into HYP
+ * @phys_addr:	The physical start address which gets mapped
+ * @size:	Size of the region being mapped
+ * @haddr:	HYP VA for this mapping
+ */
+int create_hyp_exec_mappings(phys_addr_t phys_addr, size_t size,
+			     void **haddr)
+{
+	unsigned long addr;
+	int ret;
+
+	BUG_ON(is_kernel_in_hyp_mode());
+
+	ret = __create_hyp_private_mapping(phys_addr, size,
+					   &addr, PAGE_HYP_EXEC);
+	if (ret) {
+		*haddr = NULL;
+		return ret;
+	}
+
+	*haddr = (void *)addr;
+	return 0;
+}
+
+static struct kvm_pgtable_mm_ops kvm_user_mm_ops = {
+	/* We shouldn't need any other callback to walk the PT */
+	.phys_to_virt		= kvm_host_va,
+};
+
+static int get_user_mapping_size(struct kvm *kvm, u64 addr)
+{
+	struct kvm_pgtable pgt = {
+		.pgd		= (kvm_pte_t *)kvm->mm->pgd,
+		.ia_bits	= VA_BITS,
+		.start_level	= (KVM_PGTABLE_MAX_LEVELS -
+				   CONFIG_PGTABLE_LEVELS),
+		.mm_ops		= &kvm_user_mm_ops,
+	};
+	unsigned long flags;
+	kvm_pte_t pte = 0;	/* Keep GCC quiet... */
+	u32 level = ~0;
+	int ret;
+
+	/*
+	 * Disable IRQs so that we hazard against a concurrent
+	 * teardown of the userspace page tables (which relies on
+	 * IPI-ing threads).
+	 */
+	local_irq_save(flags);
+	ret = kvm_pgtable_get_leaf(&pgt, addr, &pte, &level);
+	local_irq_restore(flags);
+
+	if (ret)
+		return ret;
+
+	/*
+	 * Not seeing an error, but not updating level? Something went
+	 * deeply wrong...
+	 */
+	if (WARN_ON(level >= KVM_PGTABLE_MAX_LEVELS))
+		return -EFAULT;
+
+	/* Oops, the userspace PTs are gone... Replay the fault */
+	if (!kvm_pte_valid(pte))
+		return -EAGAIN;
+
+	return BIT(ARM64_HW_PGTABLE_LEVEL_SHIFT(level));
+}
+
+static struct kvm_pgtable_mm_ops kvm_s2_mm_ops = {
+	.zalloc_page		= stage2_memcache_zalloc_page,
+	.zalloc_pages_exact	= kvm_s2_zalloc_pages_exact,
+	.free_pages_exact	= kvm_s2_free_pages_exact,
+	.get_page		= kvm_host_get_page,
+	.put_page		= kvm_s2_put_page,
+	.page_count		= kvm_host_page_count,
+	.phys_to_virt		= kvm_host_va,
+	.virt_to_phys		= kvm_host_pa,
+	.dcache_clean_inval_poc	= clean_dcache_guest_page,
+	.icache_inval_pou	= invalidate_icache_guest_page,
+};
+
+/**
+ * kvm_init_stage2_mmu - Initialise a S2 MMU structure
+ * @kvm:	The pointer to the KVM structure
+ * @mmu:	The pointer to the s2 MMU structure
+ *
+ * Allocates only the stage-2 HW PGD level table(s).
+ * Note we don't need locking here as this is only called when the VM is
+ * created, which can only be done once.
+ */
+int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu)
+{
+	int cpu, err;
+	struct kvm_pgtable *pgt;
+
+	if (mmu->pgt != NULL) {
+		kvm_err("kvm_arch already initialized?\n");
+		return -EINVAL;
+	}
+
+	pgt = kzalloc(sizeof(*pgt), GFP_KERNEL_ACCOUNT);
+	if (!pgt)
+		return -ENOMEM;
+
+	mmu->arch = &kvm->arch;
+	err = kvm_pgtable_stage2_init(pgt, mmu, &kvm_s2_mm_ops);
+	if (err)
+		goto out_free_pgtable;
+
+	mmu->last_vcpu_ran = alloc_percpu(typeof(*mmu->last_vcpu_ran));
+	if (!mmu->last_vcpu_ran) {
+		err = -ENOMEM;
+		goto out_destroy_pgtable;
+	}
+
+	for_each_possible_cpu(cpu)
+		*per_cpu_ptr(mmu->last_vcpu_ran, cpu) = -1;
+
+	mmu->pgt = pgt;
+	mmu->pgd_phys = __pa(pgt->pgd);
+	return 0;
+
+out_destroy_pgtable:
+	kvm_pgtable_stage2_destroy(pgt);
+out_free_pgtable:
+	kfree(pgt);
+	return err;
+}
+
+static void stage2_unmap_memslot(struct kvm *kvm,
+				 struct kvm_memory_slot *memslot)
+{
+	hva_t hva = memslot->userspace_addr;
+	phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT;
+	phys_addr_t size = PAGE_SIZE * memslot->npages;
+	hva_t reg_end = hva + size;
+
+	/*
+	 * A memory region could potentially cover multiple VMAs, and any holes
+	 * between them, so iterate over all of them to find out if we should
+	 * unmap any of them.
+	 *
+	 *     +--------------------------------------------+
+	 * +---------------+----------------+   +----------------+
+	 * |   : VMA 1     |      VMA 2     |   |    VMA 3  :    |
+	 * +---------------+----------------+   +----------------+
+	 *     |               memory region                |
+	 *     +--------------------------------------------+
+	 */
+	do {
+		struct vm_area_struct *vma;
+		hva_t vm_start, vm_end;
+
+		vma = find_vma_intersection(current->mm, hva, reg_end);
+		if (!vma)
+			break;
+
+		/*
+		 * Take the intersection of this VMA with the memory region
+		 */
+		vm_start = max(hva, vma->vm_start);
+		vm_end = min(reg_end, vma->vm_end);
+
+		if (!(vma->vm_flags & VM_PFNMAP)) {
+			gpa_t gpa = addr + (vm_start - memslot->userspace_addr);
+			unmap_stage2_range(&kvm->arch.mmu, gpa, vm_end - vm_start);
+		}
+		hva = vm_end;
+	} while (hva < reg_end);
+}
+
+/**
+ * stage2_unmap_vm - Unmap Stage-2 RAM mappings
+ * @kvm: The struct kvm pointer
+ *
+ * Go through the memregions and unmap any regular RAM
+ * backing memory already mapped to the VM.
+ */
+void stage2_unmap_vm(struct kvm *kvm)
+{
+	struct kvm_memslots *slots;
+	struct kvm_memory_slot *memslot;
+	int idx, bkt;
+
+	idx = srcu_read_lock(&kvm->srcu);
+	mmap_read_lock(current->mm);
+	write_lock(&kvm->mmu_lock);
+
+	slots = kvm_memslots(kvm);
+	kvm_for_each_memslot(memslot, bkt, slots)
+		stage2_unmap_memslot(kvm, memslot);
+
+	write_unlock(&kvm->mmu_lock);
+	mmap_read_unlock(current->mm);
+	srcu_read_unlock(&kvm->srcu, idx);
+}
+
+void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(mmu);
+	struct kvm_pgtable *pgt = NULL;
+
+	write_lock(&kvm->mmu_lock);
+	pgt = mmu->pgt;
+	if (pgt) {
+		mmu->pgd_phys = 0;
+		mmu->pgt = NULL;
+		free_percpu(mmu->last_vcpu_ran);
+	}
+	write_unlock(&kvm->mmu_lock);
+
+	if (pgt) {
+		kvm_pgtable_stage2_destroy(pgt);
+		kfree(pgt);
+	}
+}
+
+/**
+ * kvm_phys_addr_ioremap - map a device range to guest IPA
+ *
+ * @kvm:	The KVM pointer
+ * @guest_ipa:	The IPA at which to insert the mapping
+ * @pa:		The physical address of the device
+ * @size:	The size of the mapping
+ * @writable:   Whether or not to create a writable mapping
+ */
+int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
+			  phys_addr_t pa, unsigned long size, bool writable)
+{
+	phys_addr_t addr;
+	int ret = 0;
+	struct kvm_mmu_memory_cache cache = { .gfp_zero = __GFP_ZERO };
+	struct kvm_pgtable *pgt = kvm->arch.mmu.pgt;
+	enum kvm_pgtable_prot prot = KVM_PGTABLE_PROT_DEVICE |
+				     KVM_PGTABLE_PROT_R |
+				     (writable ? KVM_PGTABLE_PROT_W : 0);
+
+	if (is_protected_kvm_enabled())
+		return -EPERM;
+
+	size += offset_in_page(guest_ipa);
+	guest_ipa &= PAGE_MASK;
+
+	for (addr = guest_ipa; addr < guest_ipa + size; addr += PAGE_SIZE) {
+		ret = kvm_mmu_topup_memory_cache(&cache,
+						 kvm_mmu_cache_min_pages(kvm));
+		if (ret)
+			break;
+
+		write_lock(&kvm->mmu_lock);
+		ret = kvm_pgtable_stage2_map(pgt, addr, PAGE_SIZE, pa, prot,
+					     &cache);
+		write_unlock(&kvm->mmu_lock);
+		if (ret)
+			break;
+
+		pa += PAGE_SIZE;
+	}
+
+	kvm_mmu_free_memory_cache(&cache);
+	return ret;
+}
+
+/**
+ * stage2_wp_range() - write protect stage2 memory region range
+ * @mmu:        The KVM stage-2 MMU pointer
+ * @addr:	Start address of range
+ * @end:	End address of range
+ */
+static void stage2_wp_range(struct kvm_s2_mmu *mmu, phys_addr_t addr, phys_addr_t end)
+{
+	struct kvm *kvm = kvm_s2_mmu_to_kvm(mmu);
+	stage2_apply_range_resched(kvm, addr, end, kvm_pgtable_stage2_wrprotect);
+}
+
+/**
+ * kvm_mmu_wp_memory_region() - write protect stage 2 entries for memory slot
+ * @kvm:	The KVM pointer
+ * @slot:	The memory slot to write protect
+ *
+ * Called to start logging dirty pages after memory region
+ * KVM_MEM_LOG_DIRTY_PAGES operation is called. After this function returns
+ * all present PUD, PMD and PTEs are write protected in the memory region.
+ * Afterwards read of dirty page log can be called.
+ *
+ * Acquires kvm_mmu_lock. Called with kvm->slots_lock mutex acquired,
+ * serializing operations for VM memory regions.
+ */
+static void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot)
+{
+	struct kvm_memslots *slots = kvm_memslots(kvm);
+	struct kvm_memory_slot *memslot = id_to_memslot(slots, slot);
+	phys_addr_t start, end;
+
+	if (WARN_ON_ONCE(!memslot))
+		return;
+
+	start = memslot->base_gfn << PAGE_SHIFT;
+	end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT;
+
+	write_lock(&kvm->mmu_lock);
+	stage2_wp_range(&kvm->arch.mmu, start, end);
+	write_unlock(&kvm->mmu_lock);
+	kvm_flush_remote_tlbs(kvm);
+}
+
+/**
+ * kvm_mmu_write_protect_pt_masked() - write protect dirty pages
+ * @kvm:	The KVM pointer
+ * @slot:	The memory slot associated with mask
+ * @gfn_offset:	The gfn offset in memory slot
+ * @mask:	The mask of dirty pages at offset 'gfn_offset' in this memory
+ *		slot to be write protected
+ *
+ * Walks bits set in mask write protects the associated pte's. Caller must
+ * acquire kvm_mmu_lock.
+ */
+static void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
+		struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long mask)
+{
+	phys_addr_t base_gfn = slot->base_gfn + gfn_offset;
+	phys_addr_t start = (base_gfn +  __ffs(mask)) << PAGE_SHIFT;
+	phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT;
+
+	stage2_wp_range(&kvm->arch.mmu, start, end);
+}
+
+/*
+ * kvm_arch_mmu_enable_log_dirty_pt_masked - enable dirty logging for selected
+ * dirty pages.
+ *
+ * It calls kvm_mmu_write_protect_pt_masked to write protect selected pages to
+ * enable dirty logging for them.
+ */
+void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
+		struct kvm_memory_slot *slot,
+		gfn_t gfn_offset, unsigned long mask)
+{
+	kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask);
+}
+
+static void kvm_send_hwpoison_signal(unsigned long address, short lsb)
+{
+	send_sig_mceerr(BUS_MCEERR_AR, (void __user *)address, lsb, current);
+}
+
+static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot,
+					       unsigned long hva,
+					       unsigned long map_size)
+{
+	gpa_t gpa_start;
+	hva_t uaddr_start, uaddr_end;
+	size_t size;
+
+	/* The memslot and the VMA are guaranteed to be aligned to PAGE_SIZE */
+	if (map_size == PAGE_SIZE)
+		return true;
+
+	size = memslot->npages * PAGE_SIZE;
+
+	gpa_start = memslot->base_gfn << PAGE_SHIFT;
+
+	uaddr_start = memslot->userspace_addr;
+	uaddr_end = uaddr_start + size;
+
+	/*
+	 * Pages belonging to memslots that don't have the same alignment
+	 * within a PMD/PUD for userspace and IPA cannot be mapped with stage-2
+	 * PMD/PUD entries, because we'll end up mapping the wrong pages.
+	 *
+	 * Consider a layout like the following:
+	 *
+	 *    memslot->userspace_addr:
+	 *    +-----+--------------------+--------------------+---+
+	 *    |abcde|fgh  Stage-1 block  |    Stage-1 block tv|xyz|
+	 *    +-----+--------------------+--------------------+---+
+	 *
+	 *    memslot->base_gfn << PAGE_SHIFT:
+	 *      +---+--------------------+--------------------+-----+
+	 *      |abc|def  Stage-2 block  |    Stage-2 block   |tvxyz|
+	 *      +---+--------------------+--------------------+-----+
+	 *
+	 * If we create those stage-2 blocks, we'll end up with this incorrect
+	 * mapping:
+	 *   d -> f
+	 *   e -> g
+	 *   f -> h
+	 */
+	if ((gpa_start & (map_size - 1)) != (uaddr_start & (map_size - 1)))
+		return false;
+
+	/*
+	 * Next, let's make sure we're not trying to map anything not covered
+	 * by the memslot. This means we have to prohibit block size mappings
+	 * for the beginning and end of a non-block aligned and non-block sized
+	 * memory slot (illustrated by the head and tail parts of the
+	 * userspace view above containing pages 'abcde' and 'xyz',
+	 * respectively).
+	 *
+	 * Note that it doesn't matter if we do the check using the
+	 * userspace_addr or the base_gfn, as both are equally aligned (per
+	 * the check above) and equally sized.
+	 */
+	return (hva & ~(map_size - 1)) >= uaddr_start &&
+	       (hva & ~(map_size - 1)) + map_size <= uaddr_end;
+}
+
+/*
+ * Check if the given hva is backed by a transparent huge page (THP) and
+ * whether it can be mapped using block mapping in stage2. If so, adjust
+ * the stage2 PFN and IPA accordingly. Only PMD_SIZE THPs are currently
+ * supported. This will need to be updated to support other THP sizes.
+ *
+ * Returns the size of the mapping.
+ */
+static long
+transparent_hugepage_adjust(struct kvm *kvm, struct kvm_memory_slot *memslot,
+			    unsigned long hva, kvm_pfn_t *pfnp,
+			    phys_addr_t *ipap)
+{
+	kvm_pfn_t pfn = *pfnp;
+
+	/*
+	 * Make sure the adjustment is done only for THP pages. Also make
+	 * sure that the HVA and IPA are sufficiently aligned and that the
+	 * block map is contained within the memslot.
+	 */
+	if (fault_supports_stage2_huge_mapping(memslot, hva, PMD_SIZE)) {
+		int sz = get_user_mapping_size(kvm, hva);
+
+		if (sz < 0)
+			return sz;
+
+		if (sz < PMD_SIZE)
+			return PAGE_SIZE;
+
+		/*
+		 * The address we faulted on is backed by a transparent huge
+		 * page.  However, because we map the compound huge page and
+		 * not the individual tail page, we need to transfer the
+		 * refcount to the head page.  We have to be careful that the
+		 * THP doesn't start to split while we are adjusting the
+		 * refcounts.
+		 *
+		 * We are sure this doesn't happen, because mmu_invalidate_retry
+		 * was successful and we are holding the mmu_lock, so if this
+		 * THP is trying to split, it will be blocked in the mmu
+		 * notifier before touching any of the pages, specifically
+		 * before being able to call __split_huge_page_refcount().
+		 *
+		 * We can therefore safely transfer the refcount from PG_tail
+		 * to PG_head and switch the pfn from a tail page to the head
+		 * page accordingly.
+		 */
+		*ipap &= PMD_MASK;
+		kvm_release_pfn_clean(pfn);
+		pfn &= ~(PTRS_PER_PMD - 1);
+		get_page(pfn_to_page(pfn));
+		*pfnp = pfn;
+
+		return PMD_SIZE;
+	}
+
+	/* Use page mapping if we cannot use block mapping. */
+	return PAGE_SIZE;
+}
+
+static int get_vma_page_shift(struct vm_area_struct *vma, unsigned long hva)
+{
+	unsigned long pa;
+
+	if (is_vm_hugetlb_page(vma) && !(vma->vm_flags & VM_PFNMAP))
+		return huge_page_shift(hstate_vma(vma));
+
+	if (!(vma->vm_flags & VM_PFNMAP))
+		return PAGE_SHIFT;
+
+	VM_BUG_ON(is_vm_hugetlb_page(vma));
+
+	pa = (vma->vm_pgoff << PAGE_SHIFT) + (hva - vma->vm_start);
+
+#ifndef __PAGETABLE_PMD_FOLDED
+	if ((hva & (PUD_SIZE - 1)) == (pa & (PUD_SIZE - 1)) &&
+	    ALIGN_DOWN(hva, PUD_SIZE) >= vma->vm_start &&
+	    ALIGN(hva, PUD_SIZE) <= vma->vm_end)
+		return PUD_SHIFT;
+#endif
+
+	if ((hva & (PMD_SIZE - 1)) == (pa & (PMD_SIZE - 1)) &&
+	    ALIGN_DOWN(hva, PMD_SIZE) >= vma->vm_start &&
+	    ALIGN(hva, PMD_SIZE) <= vma->vm_end)
+		return PMD_SHIFT;
+
+	return PAGE_SHIFT;
+}
+
+/*
+ * The page will be mapped in stage 2 as Normal Cacheable, so the VM will be
+ * able to see the page's tags and therefore they must be initialised first. If
+ * PG_mte_tagged is set, tags have already been initialised.
+ *
+ * The race in the test/set of the PG_mte_tagged flag is handled by:
+ * - preventing VM_SHARED mappings in a memslot with MTE preventing two VMs
+ *   racing to santise the same page
+ * - mmap_lock protects between a VM faulting a page in and the VMM performing
+ *   an mprotect() to add VM_MTE
+ */
+static int sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn,
+			     unsigned long size)
+{
+	unsigned long i, nr_pages = size >> PAGE_SHIFT;
+	struct page *page;
+
+	if (!kvm_has_mte(kvm))
+		return 0;
+
+	/*
+	 * pfn_to_online_page() is used to reject ZONE_DEVICE pages
+	 * that may not support tags.
+	 */
+	page = pfn_to_online_page(pfn);
+
+	if (!page)
+		return -EFAULT;
+
+	for (i = 0; i < nr_pages; i++, page++) {
+		if (!page_mte_tagged(page)) {
+			mte_clear_page_tags(page_address(page));
+			set_page_mte_tagged(page);
+		}
+	}
+
+	return 0;
+}
+
+static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
+			  struct kvm_memory_slot *memslot, unsigned long hva,
+			  unsigned long fault_status)
+{
+	int ret = 0;
+	bool write_fault, writable, force_pte = false;
+	bool exec_fault;
+	bool device = false;
+	bool shared;
+	unsigned long mmu_seq;
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
+	struct vm_area_struct *vma;
+	short vma_shift;
+	gfn_t gfn;
+	kvm_pfn_t pfn;
+	bool logging_active = memslot_is_logging(memslot);
+	bool use_read_lock = false;
+	unsigned long fault_level = kvm_vcpu_trap_get_fault_level(vcpu);
+	long vma_pagesize, fault_granule;
+	enum kvm_pgtable_prot prot = KVM_PGTABLE_PROT_R;
+	struct kvm_pgtable *pgt;
+
+	fault_granule = 1UL << ARM64_HW_PGTABLE_LEVEL_SHIFT(fault_level);
+	write_fault = kvm_is_write_fault(vcpu);
+	exec_fault = kvm_vcpu_trap_is_exec_fault(vcpu);
+	VM_BUG_ON(write_fault && exec_fault);
+
+	if (fault_status == FSC_PERM && !write_fault && !exec_fault) {
+		kvm_err("Unexpected L2 read permission error\n");
+		return -EFAULT;
+	}
+
+	/*
+	 * Permission faults just need to update the existing leaf entry,
+	 * and so normally don't require allocations from the memcache. The
+	 * only exception to this is when dirty logging is enabled at runtime
+	 * and a write fault needs to collapse a block entry into a table.
+	 */
+	if (fault_status != FSC_PERM ||
+	    (logging_active && write_fault)) {
+		ret = kvm_mmu_topup_memory_cache(memcache,
+						 kvm_mmu_cache_min_pages(kvm));
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * Let's check if we will get back a huge page backed by hugetlbfs, or
+	 * get block mapping for device MMIO region.
+	 */
+	mmap_read_lock(current->mm);
+	vma = vma_lookup(current->mm, hva);
+	if (unlikely(!vma)) {
+		kvm_err("Failed to find VMA for hva 0x%lx\n", hva);
+		mmap_read_unlock(current->mm);
+		return -EFAULT;
+	}
+
+	/*
+	 * logging_active is guaranteed to never be true for VM_PFNMAP
+	 * memslots.
+	 */
+	if (logging_active) {
+		force_pte = true;
+		vma_shift = PAGE_SHIFT;
+		use_read_lock = (fault_status == FSC_PERM && write_fault &&
+				 fault_granule == PAGE_SIZE);
+	} else {
+		vma_shift = get_vma_page_shift(vma, hva);
+	}
+
+	shared = (vma->vm_flags & VM_SHARED);
+
+	switch (vma_shift) {
+#ifndef __PAGETABLE_PMD_FOLDED
+	case PUD_SHIFT:
+		if (fault_supports_stage2_huge_mapping(memslot, hva, PUD_SIZE))
+			break;
+		fallthrough;
+#endif
+	case CONT_PMD_SHIFT:
+		vma_shift = PMD_SHIFT;
+		fallthrough;
+	case PMD_SHIFT:
+		if (fault_supports_stage2_huge_mapping(memslot, hva, PMD_SIZE))
+			break;
+		fallthrough;
+	case CONT_PTE_SHIFT:
+		vma_shift = PAGE_SHIFT;
+		force_pte = true;
+		fallthrough;
+	case PAGE_SHIFT:
+		break;
+	default:
+		WARN_ONCE(1, "Unknown vma_shift %d", vma_shift);
+	}
+
+	vma_pagesize = 1UL << vma_shift;
+	if (vma_pagesize == PMD_SIZE || vma_pagesize == PUD_SIZE)
+		fault_ipa &= ~(vma_pagesize - 1);
+
+	gfn = fault_ipa >> PAGE_SHIFT;
+
+	/*
+	 * Read mmu_invalidate_seq so that KVM can detect if the results of
+	 * vma_lookup() or __gfn_to_pfn_memslot() become stale prior to
+	 * acquiring kvm->mmu_lock.
+	 *
+	 * Rely on mmap_read_unlock() for an implicit smp_rmb(), which pairs
+	 * with the smp_wmb() in kvm_mmu_invalidate_end().
+	 */
+	mmu_seq = vcpu->kvm->mmu_invalidate_seq;
+	mmap_read_unlock(current->mm);
+
+	pfn = __gfn_to_pfn_memslot(memslot, gfn, false, NULL,
+				   write_fault, &writable, NULL);
+	if (pfn == KVM_PFN_ERR_HWPOISON) {
+		kvm_send_hwpoison_signal(hva, vma_shift);
+		return 0;
+	}
+	if (is_error_noslot_pfn(pfn))
+		return -EFAULT;
+
+	if (kvm_is_device_pfn(pfn)) {
+		/*
+		 * If the page was identified as device early by looking at
+		 * the VMA flags, vma_pagesize is already representing the
+		 * largest quantity we can map.  If instead it was mapped
+		 * via gfn_to_pfn_prot(), vma_pagesize is set to PAGE_SIZE
+		 * and must not be upgraded.
+		 *
+		 * In both cases, we don't let transparent_hugepage_adjust()
+		 * change things at the last minute.
+		 */
+		device = true;
+	} else if (logging_active && !write_fault) {
+		/*
+		 * Only actually map the page as writable if this was a write
+		 * fault.
+		 */
+		writable = false;
+	}
+
+	if (exec_fault && device)
+		return -ENOEXEC;
+
+	/*
+	 * To reduce MMU contentions and enhance concurrency during dirty
+	 * logging dirty logging, only acquire read lock for permission
+	 * relaxation.
+	 */
+	if (use_read_lock)
+		read_lock(&kvm->mmu_lock);
+	else
+		write_lock(&kvm->mmu_lock);
+	pgt = vcpu->arch.hw_mmu->pgt;
+	if (mmu_invalidate_retry(kvm, mmu_seq))
+		goto out_unlock;
+
+	/*
+	 * If we are not forced to use page mapping, check if we are
+	 * backed by a THP and thus use block mapping if possible.
+	 */
+	if (vma_pagesize == PAGE_SIZE && !(force_pte || device)) {
+		if (fault_status == FSC_PERM && fault_granule > PAGE_SIZE)
+			vma_pagesize = fault_granule;
+		else
+			vma_pagesize = transparent_hugepage_adjust(kvm, memslot,
+								   hva, &pfn,
+								   &fault_ipa);
+
+		if (vma_pagesize < 0) {
+			ret = vma_pagesize;
+			goto out_unlock;
+		}
+	}
+
+	if (fault_status != FSC_PERM && !device && kvm_has_mte(kvm)) {
+		/* Check the VMM hasn't introduced a new VM_SHARED VMA */
+		if (!shared)
+			ret = sanitise_mte_tags(kvm, pfn, vma_pagesize);
+		else
+			ret = -EFAULT;
+		if (ret)
+			goto out_unlock;
+	}
+
+	if (writable)
+		prot |= KVM_PGTABLE_PROT_W;
+
+	if (exec_fault)
+		prot |= KVM_PGTABLE_PROT_X;
+
+	if (device)
+		prot |= KVM_PGTABLE_PROT_DEVICE;
+	else if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC))
+		prot |= KVM_PGTABLE_PROT_X;
+
+	/*
+	 * Under the premise of getting a FSC_PERM fault, we just need to relax
+	 * permissions only if vma_pagesize equals fault_granule. Otherwise,
+	 * kvm_pgtable_stage2_map() should be called to change block size.
+	 */
+	if (fault_status == FSC_PERM && vma_pagesize == fault_granule) {
+		ret = kvm_pgtable_stage2_relax_perms(pgt, fault_ipa, prot);
+	} else {
+		WARN_ONCE(use_read_lock, "Attempted stage-2 map outside of write lock\n");
+
+		ret = kvm_pgtable_stage2_map(pgt, fault_ipa, vma_pagesize,
+					     __pfn_to_phys(pfn), prot,
+					     memcache);
+	}
+
+	/* Mark the page dirty only if the fault is handled successfully */
+	if (writable && !ret) {
+		kvm_set_pfn_dirty(pfn);
+		mark_page_dirty_in_slot(kvm, memslot, gfn);
+	}
+
+out_unlock:
+	if (use_read_lock)
+		read_unlock(&kvm->mmu_lock);
+	else
+		write_unlock(&kvm->mmu_lock);
+	kvm_set_pfn_accessed(pfn);
+	kvm_release_pfn_clean(pfn);
+	return ret != -EAGAIN ? ret : 0;
+}
+
+/* Resolve the access fault by making the page young again. */
+static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
+{
+	pte_t pte;
+	kvm_pte_t kpte;
+	struct kvm_s2_mmu *mmu;
+
+	trace_kvm_access_fault(fault_ipa);
+
+	write_lock(&vcpu->kvm->mmu_lock);
+	mmu = vcpu->arch.hw_mmu;
+	kpte = kvm_pgtable_stage2_mkyoung(mmu->pgt, fault_ipa);
+	write_unlock(&vcpu->kvm->mmu_lock);
+
+	pte = __pte(kpte);
+	if (pte_valid(pte))
+		kvm_set_pfn_accessed(pte_pfn(pte));
+}
+
+/**
+ * kvm_handle_guest_abort - handles all 2nd stage aborts
+ * @vcpu:	the VCPU pointer
+ *
+ * Any abort that gets to the host is almost guaranteed to be caused by a
+ * missing second stage translation table entry, which can mean that either the
+ * guest simply needs more memory and we must allocate an appropriate page or it
+ * can mean that the guest tried to access I/O memory, which is emulated by user
+ * space. The distinction is based on the IPA causing the fault and whether this
+ * memory region has been registered as standard RAM by user space.
+ */
+int kvm_handle_guest_abort(struct kvm_vcpu *vcpu)
+{
+	unsigned long fault_status;
+	phys_addr_t fault_ipa;
+	struct kvm_memory_slot *memslot;
+	unsigned long hva;
+	bool is_iabt, write_fault, writable;
+	gfn_t gfn;
+	int ret, idx;
+
+	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
+
+	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
+	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
+
+	if (fault_status == FSC_FAULT) {
+		/* Beyond sanitised PARange (which is the IPA limit) */
+		if (fault_ipa >= BIT_ULL(get_kvm_ipa_limit())) {
+			kvm_inject_size_fault(vcpu);
+			return 1;
+		}
+
+		/* Falls between the IPA range and the PARange? */
+		if (fault_ipa >= BIT_ULL(vcpu->arch.hw_mmu->pgt->ia_bits)) {
+			fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0);
+
+			if (is_iabt)
+				kvm_inject_pabt(vcpu, fault_ipa);
+			else
+				kvm_inject_dabt(vcpu, fault_ipa);
+			return 1;
+		}
+	}
+
+	/* Synchronous External Abort? */
+	if (kvm_vcpu_abt_issea(vcpu)) {
+		/*
+		 * For RAS the host kernel may handle this abort.
+		 * There is no need to pass the error into the guest.
+		 */
+		if (kvm_handle_guest_sea(fault_ipa, kvm_vcpu_get_esr(vcpu)))
+			kvm_inject_vabt(vcpu);
+
+		return 1;
+	}
+
+	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_esr(vcpu),
+			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
+
+	/* Check the stage-2 fault is trans. fault or write fault */
+	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
+	    fault_status != FSC_ACCESS) {
+		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
+			kvm_vcpu_trap_get_class(vcpu),
+			(unsigned long)kvm_vcpu_trap_get_fault(vcpu),
+			(unsigned long)kvm_vcpu_get_esr(vcpu));
+		return -EFAULT;
+	}
+
+	idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+	gfn = fault_ipa >> PAGE_SHIFT;
+	memslot = gfn_to_memslot(vcpu->kvm, gfn);
+	hva = gfn_to_hva_memslot_prot(memslot, gfn, &writable);
+	write_fault = kvm_is_write_fault(vcpu);
+	if (kvm_is_error_hva(hva) || (write_fault && !writable)) {
+		/*
+		 * The guest has put either its instructions or its page-tables
+		 * somewhere it shouldn't have. Userspace won't be able to do
+		 * anything about this (there's no syndrome for a start), so
+		 * re-inject the abort back into the guest.
+		 */
+		if (is_iabt) {
+			ret = -ENOEXEC;
+			goto out;
+		}
+
+		if (kvm_vcpu_abt_iss1tw(vcpu)) {
+			kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
+			ret = 1;
+			goto out_unlock;
+		}
+
+		/*
+		 * Check for a cache maintenance operation. Since we
+		 * ended-up here, we know it is outside of any memory
+		 * slot. But we can't find out if that is for a device,
+		 * or if the guest is just being stupid. The only thing
+		 * we know for sure is that this range cannot be cached.
+		 *
+		 * So let's assume that the guest is just being
+		 * cautious, and skip the instruction.
+		 */
+		if (kvm_is_error_hva(hva) && kvm_vcpu_dabt_is_cm(vcpu)) {
+			kvm_incr_pc(vcpu);
+			ret = 1;
+			goto out_unlock;
+		}
+
+		/*
+		 * The IPA is reported as [MAX:12], so we need to
+		 * complement it with the bottom 12 bits from the
+		 * faulting VA. This is always 12 bits, irrespective
+		 * of the page size.
+		 */
+		fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ((1 << 12) - 1);
+		ret = io_mem_abort(vcpu, fault_ipa);
+		goto out_unlock;
+	}
+
+	/* Userspace should not be able to register out-of-bounds IPAs */
+	VM_BUG_ON(fault_ipa >= kvm_phys_size(vcpu->kvm));
+
+	if (fault_status == FSC_ACCESS) {
+		handle_access_fault(vcpu, fault_ipa);
+		ret = 1;
+		goto out_unlock;
+	}
+
+	ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status);
+	if (ret == 0)
+		ret = 1;
+out:
+	if (ret == -ENOEXEC) {
+		kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
+		ret = 1;
+	}
+out_unlock:
+	srcu_read_unlock(&vcpu->kvm->srcu, idx);
+	return ret;
+}
+
+bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+	if (!kvm->arch.mmu.pgt)
+		return false;
+
+	__unmap_stage2_range(&kvm->arch.mmu, range->start << PAGE_SHIFT,
+			     (range->end - range->start) << PAGE_SHIFT,
+			     range->may_block);
+
+	return false;
+}
+
+bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+	kvm_pfn_t pfn = pte_pfn(range->pte);
+	int ret;
+
+	if (!kvm->arch.mmu.pgt)
+		return false;
+
+	WARN_ON(range->end - range->start != 1);
+
+	ret = sanitise_mte_tags(kvm, pfn, PAGE_SIZE);
+	if (ret)
+		return false;
+
+	/*
+	 * We've moved a page around, probably through CoW, so let's treat
+	 * it just like a translation fault and the map handler will clean
+	 * the cache to the PoC.
+	 *
+	 * The MMU notifiers will have unmapped a huge PMD before calling
+	 * ->change_pte() (which in turn calls kvm_set_spte_gfn()) and
+	 * therefore we never need to clear out a huge PMD through this
+	 * calling path and a memcache is not required.
+	 */
+	kvm_pgtable_stage2_map(kvm->arch.mmu.pgt, range->start << PAGE_SHIFT,
+			       PAGE_SIZE, __pfn_to_phys(pfn),
+			       KVM_PGTABLE_PROT_R, NULL);
+
+	return false;
+}
+
+bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+	u64 size = (range->end - range->start) << PAGE_SHIFT;
+	kvm_pte_t kpte;
+	pte_t pte;
+
+	if (!kvm->arch.mmu.pgt)
+		return false;
+
+	WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE);
+
+	kpte = kvm_pgtable_stage2_mkold(kvm->arch.mmu.pgt,
+					range->start << PAGE_SHIFT);
+	pte = __pte(kpte);
+	return pte_valid(pte) && pte_young(pte);
+}
+
+bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+	if (!kvm->arch.mmu.pgt)
+		return false;
+
+	return kvm_pgtable_stage2_is_young(kvm->arch.mmu.pgt,
+					   range->start << PAGE_SHIFT);
+}
+
+phys_addr_t kvm_mmu_get_httbr(void)
+{
+	return __pa(hyp_pgtable->pgd);
+}
+
+phys_addr_t kvm_get_idmap_vector(void)
+{
+	return hyp_idmap_vector;
+}
+
+static int kvm_map_idmap_text(void)
+{
+	unsigned long size = hyp_idmap_end - hyp_idmap_start;
+	int err = __create_hyp_mappings(hyp_idmap_start, size, hyp_idmap_start,
+					PAGE_HYP_EXEC);
+	if (err)
+		kvm_err("Failed to idmap %lx-%lx\n",
+			hyp_idmap_start, hyp_idmap_end);
+
+	return err;
+}
+
+static void *kvm_hyp_zalloc_page(void *arg)
+{
+	return (void *)get_zeroed_page(GFP_KERNEL);
+}
+
+static struct kvm_pgtable_mm_ops kvm_hyp_mm_ops = {
+	.zalloc_page		= kvm_hyp_zalloc_page,
+	.get_page		= kvm_host_get_page,
+	.put_page		= kvm_host_put_page,
+	.phys_to_virt		= kvm_host_va,
+	.virt_to_phys		= kvm_host_pa,
+};
+
+int kvm_mmu_init(u32 *hyp_va_bits)
+{
+	int err;
+
+	hyp_idmap_start = __pa_symbol(__hyp_idmap_text_start);
+	hyp_idmap_start = ALIGN_DOWN(hyp_idmap_start, PAGE_SIZE);
+	hyp_idmap_end = __pa_symbol(__hyp_idmap_text_end);
+	hyp_idmap_end = ALIGN(hyp_idmap_end, PAGE_SIZE);
+	hyp_idmap_vector = __pa_symbol(__kvm_hyp_init);
+
+	/*
+	 * We rely on the linker script to ensure at build time that the HYP
+	 * init code does not cross a page boundary.
+	 */
+	BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK);
+
+	*hyp_va_bits = 64 - ((idmap_t0sz & TCR_T0SZ_MASK) >> TCR_T0SZ_OFFSET);
+	kvm_debug("Using %u-bit virtual addresses at EL2\n", *hyp_va_bits);
+	kvm_debug("IDMAP page: %lx\n", hyp_idmap_start);
+	kvm_debug("HYP VA range: %lx:%lx\n",
+		  kern_hyp_va(PAGE_OFFSET),
+		  kern_hyp_va((unsigned long)high_memory - 1));
+
+	if (hyp_idmap_start >= kern_hyp_va(PAGE_OFFSET) &&
+	    hyp_idmap_start <  kern_hyp_va((unsigned long)high_memory - 1) &&
+	    hyp_idmap_start != (unsigned long)__hyp_idmap_text_start) {
+		/*
+		 * The idmap page is intersecting with the VA space,
+		 * it is not safe to continue further.
+		 */
+		kvm_err("IDMAP intersecting with HYP VA, unable to continue\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	hyp_pgtable = kzalloc(sizeof(*hyp_pgtable), GFP_KERNEL);
+	if (!hyp_pgtable) {
+		kvm_err("Hyp mode page-table not allocated\n");
+		err = -ENOMEM;
+		goto out;
+	}
+
+	err = kvm_pgtable_hyp_init(hyp_pgtable, *hyp_va_bits, &kvm_hyp_mm_ops);
+	if (err)
+		goto out_free_pgtable;
+
+	err = kvm_map_idmap_text();
+	if (err)
+		goto out_destroy_pgtable;
+
+	io_map_base = hyp_idmap_start;
+	return 0;
+
+out_destroy_pgtable:
+	kvm_pgtable_hyp_destroy(hyp_pgtable);
+out_free_pgtable:
+	kfree(hyp_pgtable);
+	hyp_pgtable = NULL;
+out:
+	return err;
+}
+
+void kvm_arch_commit_memory_region(struct kvm *kvm,
+				   struct kvm_memory_slot *old,
+				   const struct kvm_memory_slot *new,
+				   enum kvm_mr_change change)
+{
+	/*
+	 * At this point memslot has been committed and there is an
+	 * allocated dirty_bitmap[], dirty pages will be tracked while the
+	 * memory slot is write protected.
+	 */
+	if (change != KVM_MR_DELETE && new->flags & KVM_MEM_LOG_DIRTY_PAGES) {
+		/*
+		 * If we're with initial-all-set, we don't need to write
+		 * protect any pages because they're all reported as dirty.
+		 * Huge pages and normal pages will be write protect gradually.
+		 */
+		if (!kvm_dirty_log_manual_protect_and_init_set(kvm)) {
+			kvm_mmu_wp_memory_region(kvm, new->id);
+		}
+	}
+}
+
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+				   const struct kvm_memory_slot *old,
+				   struct kvm_memory_slot *new,
+				   enum kvm_mr_change change)
+{
+	hva_t hva, reg_end;
+	int ret = 0;
+
+	if (change != KVM_MR_CREATE && change != KVM_MR_MOVE &&
+			change != KVM_MR_FLAGS_ONLY)
+		return 0;
+
+	/*
+	 * Prevent userspace from creating a memory region outside of the IPA
+	 * space addressable by the KVM guest IPA space.
+	 */
+	if ((new->base_gfn + new->npages) > (kvm_phys_size(kvm) >> PAGE_SHIFT))
+		return -EFAULT;
+
+	hva = new->userspace_addr;
+	reg_end = hva + (new->npages << PAGE_SHIFT);
+
+	mmap_read_lock(current->mm);
+	/*
+	 * A memory region could potentially cover multiple VMAs, and any holes
+	 * between them, so iterate over all of them.
+	 *
+	 *     +--------------------------------------------+
+	 * +---------------+----------------+   +----------------+
+	 * |   : VMA 1     |      VMA 2     |   |    VMA 3  :    |
+	 * +---------------+----------------+   +----------------+
+	 *     |               memory region                |
+	 *     +--------------------------------------------+
+	 */
+	do {
+		struct vm_area_struct *vma;
+
+		vma = find_vma_intersection(current->mm, hva, reg_end);
+		if (!vma)
+			break;
+
+		/*
+		 * VM_SHARED mappings are not allowed with MTE to avoid races
+		 * when updating the PG_mte_tagged page flag, see
+		 * sanitise_mte_tags for more details.
+		 */
+		if (kvm_has_mte(kvm) && vma->vm_flags & VM_SHARED) {
+			ret = -EINVAL;
+			break;
+		}
+
+		if (vma->vm_flags & VM_PFNMAP) {
+			/* IO region dirty page logging not allowed */
+			if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) {
+				ret = -EINVAL;
+				break;
+			}
+		}
+		hva = min(reg_end, vma->vm_end);
+	} while (hva < reg_end);
+
+	mmap_read_unlock(current->mm);
+	return ret;
+}
+
+void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
+{
+}
+
+void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
+{
+}
+
+void kvm_arch_flush_shadow_all(struct kvm *kvm)
+{
+	kvm_free_stage2_pgd(&kvm->arch.mmu);
+}
+
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+				   struct kvm_memory_slot *slot)
+{
+	gpa_t gpa = slot->base_gfn << PAGE_SHIFT;
+	phys_addr_t size = slot->npages << PAGE_SHIFT;
+
+	write_lock(&kvm->mmu_lock);
+	unmap_stage2_range(&kvm->arch.mmu, gpa, size);
+	write_unlock(&kvm->mmu_lock);
+}
+
+/*
+ * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized).
+ *
+ * Main problems:
+ * - S/W ops are local to a CPU (not broadcast)
+ * - We have line migration behind our back (speculation)
+ * - System caches don't support S/W at all (damn!)
+ *
+ * In the face of the above, the best we can do is to try and convert
+ * S/W ops to VA ops. Because the guest is not allowed to infer the
+ * S/W to PA mapping, it can only use S/W to nuke the whole cache,
+ * which is a rather good thing for us.
+ *
+ * Also, it is only used when turning caches on/off ("The expected
+ * usage of the cache maintenance instructions that operate by set/way
+ * is associated with the cache maintenance instructions associated
+ * with the powerdown and powerup of caches, if this is required by
+ * the implementation.").
+ *
+ * We use the following policy:
+ *
+ * - If we trap a S/W operation, we enable VM trapping to detect
+ *   caches being turned on/off, and do a full clean.
+ *
+ * - We flush the caches on both caches being turned on and off.
+ *
+ * - Once the caches are enabled, we stop trapping VM ops.
+ */
+void kvm_set_way_flush(struct kvm_vcpu *vcpu)
+{
+	unsigned long hcr = *vcpu_hcr(vcpu);
+
+	/*
+	 * If this is the first time we do a S/W operation
+	 * (i.e. HCR_TVM not set) flush the whole memory, and set the
+	 * VM trapping.
+	 *
+	 * Otherwise, rely on the VM trapping to wait for the MMU +
+	 * Caches to be turned off. At that point, we'll be able to
+	 * clean the caches again.
+	 */
+	if (!(hcr & HCR_TVM)) {
+		trace_kvm_set_way_flush(*vcpu_pc(vcpu),
+					vcpu_has_cache_enabled(vcpu));
+		stage2_flush_vm(vcpu->kvm);
+		*vcpu_hcr(vcpu) = hcr | HCR_TVM;
+	}
+}
+
+void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled)
+{
+	bool now_enabled = vcpu_has_cache_enabled(vcpu);
+
+	/*
+	 * If switching the MMU+caches on, need to invalidate the caches.
+	 * If switching it off, need to clean the caches.
+	 * Clean + invalidate does the trick always.
+	 */
+	if (now_enabled != was_enabled)
+		stage2_flush_vm(vcpu->kvm);
+
+	/* Caches are now on, stop trapping VM ops (until a S/W op) */
+	if (now_enabled)
+		*vcpu_hcr(vcpu) &= ~HCR_TVM;
+
+	trace_kvm_toggle_cache(*vcpu_pc(vcpu), was_enabled, now_enabled);
+}
diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c
new file mode 100644
index 000000000..ebecb7c04
--- /dev/null
+++ b/arch/arm64/kvm/pkvm.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/memblock.h>
+#include <linux/sort.h>
+
+#include <asm/kvm_pkvm.h>
+
+#include "hyp_constants.h"
+
+static struct memblock_region *hyp_memory = kvm_nvhe_sym(hyp_memory);
+static unsigned int *hyp_memblock_nr_ptr = &kvm_nvhe_sym(hyp_memblock_nr);
+
+phys_addr_t hyp_mem_base;
+phys_addr_t hyp_mem_size;
+
+static int cmp_hyp_memblock(const void *p1, const void *p2)
+{
+	const struct memblock_region *r1 = p1;
+	const struct memblock_region *r2 = p2;
+
+	return r1->base < r2->base ? -1 : (r1->base > r2->base);
+}
+
+static void __init sort_memblock_regions(void)
+{
+	sort(hyp_memory,
+	     *hyp_memblock_nr_ptr,
+	     sizeof(struct memblock_region),
+	     cmp_hyp_memblock,
+	     NULL);
+}
+
+static int __init register_memblock_regions(void)
+{
+	struct memblock_region *reg;
+
+	for_each_mem_region(reg) {
+		if (*hyp_memblock_nr_ptr >= HYP_MEMBLOCK_REGIONS)
+			return -ENOMEM;
+
+		hyp_memory[*hyp_memblock_nr_ptr] = *reg;
+		(*hyp_memblock_nr_ptr)++;
+	}
+	sort_memblock_regions();
+
+	return 0;
+}
+
+void __init kvm_hyp_reserve(void)
+{
+	u64 nr_pages, prev, hyp_mem_pages = 0;
+	int ret;
+
+	if (!is_hyp_mode_available() || is_kernel_in_hyp_mode())
+		return;
+
+	if (kvm_get_mode() != KVM_MODE_PROTECTED)
+		return;
+
+	ret = register_memblock_regions();
+	if (ret) {
+		*hyp_memblock_nr_ptr = 0;
+		kvm_err("Failed to register hyp memblocks: %d\n", ret);
+		return;
+	}
+
+	hyp_mem_pages += hyp_s1_pgtable_pages();
+	hyp_mem_pages += host_s2_pgtable_pages();
+
+	/*
+	 * The hyp_vmemmap needs to be backed by pages, but these pages
+	 * themselves need to be present in the vmemmap, so compute the number
+	 * of pages needed by looking for a fixed point.
+	 */
+	nr_pages = 0;
+	do {
+		prev = nr_pages;
+		nr_pages = hyp_mem_pages + prev;
+		nr_pages = DIV_ROUND_UP(nr_pages * STRUCT_HYP_PAGE_SIZE,
+					PAGE_SIZE);
+		nr_pages += __hyp_pgtable_max_pages(nr_pages);
+	} while (nr_pages != prev);
+	hyp_mem_pages += nr_pages;
+
+	/*
+	 * Try to allocate a PMD-aligned region to reduce TLB pressure once
+	 * this is unmapped from the host stage-2, and fallback to PAGE_SIZE.
+	 */
+	hyp_mem_size = hyp_mem_pages << PAGE_SHIFT;
+	hyp_mem_base = memblock_phys_alloc(ALIGN(hyp_mem_size, PMD_SIZE),
+					   PMD_SIZE);
+	if (!hyp_mem_base)
+		hyp_mem_base = memblock_phys_alloc(hyp_mem_size, PAGE_SIZE);
+	else
+		hyp_mem_size = ALIGN(hyp_mem_size, PMD_SIZE);
+
+	if (!hyp_mem_base) {
+		kvm_err("Failed to reserve hyp memory\n");
+		return;
+	}
+
+	kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20,
+		 hyp_mem_base);
+}
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
new file mode 100644
index 000000000..c7e5f6a28
--- /dev/null
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -0,0 +1,1016 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 Linaro Ltd.
+ * Author: Shannon Zhao <shannon.zhao@linaro.org>
+ */
+
+#include <linux/cpu.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/list.h>
+#include <linux/perf_event.h>
+#include <linux/perf/arm_pmu.h>
+#include <linux/uaccess.h>
+#include <asm/kvm_emulate.h>
+#include <kvm/arm_pmu.h>
+#include <kvm/arm_vgic.h>
+
+#define PERF_ATTR_CFG1_COUNTER_64BIT	BIT(0)
+
+DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available);
+
+static LIST_HEAD(arm_pmus);
+static DEFINE_MUTEX(arm_pmus_lock);
+
+static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx);
+
+static u32 kvm_pmu_event_mask(struct kvm *kvm)
+{
+	unsigned int pmuver;
+
+	pmuver = kvm->arch.arm_pmu->pmuver;
+
+	switch (pmuver) {
+	case ID_AA64DFR0_EL1_PMUVer_IMP:
+		return GENMASK(9, 0);
+	case ID_AA64DFR0_EL1_PMUVer_V3P1:
+	case ID_AA64DFR0_EL1_PMUVer_V3P4:
+	case ID_AA64DFR0_EL1_PMUVer_V3P5:
+	case ID_AA64DFR0_EL1_PMUVer_V3P7:
+		return GENMASK(15, 0);
+	default:		/* Shouldn't be here, just for sanity */
+		WARN_ONCE(1, "Unknown PMU version %d\n", pmuver);
+		return 0;
+	}
+}
+
+/**
+ * kvm_pmu_idx_is_64bit - determine if select_idx is a 64bit counter
+ * @vcpu: The vcpu pointer
+ * @select_idx: The counter index
+ */
+static bool kvm_pmu_idx_is_64bit(struct kvm_vcpu *vcpu, u64 select_idx)
+{
+	return (select_idx == ARMV8_PMU_CYCLE_IDX);
+}
+
+static bool kvm_pmu_idx_has_64bit_overflow(struct kvm_vcpu *vcpu, u64 select_idx)
+{
+	return (select_idx == ARMV8_PMU_CYCLE_IDX &&
+		__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_LC);
+}
+
+static bool kvm_pmu_counter_can_chain(struct kvm_vcpu *vcpu, u64 idx)
+{
+	return (!(idx & 1) && (idx + 1) < ARMV8_PMU_CYCLE_IDX &&
+		!kvm_pmu_idx_has_64bit_overflow(vcpu, idx));
+}
+
+static struct kvm_vcpu *kvm_pmc_to_vcpu(struct kvm_pmc *pmc)
+{
+	struct kvm_pmu *pmu;
+	struct kvm_vcpu_arch *vcpu_arch;
+
+	pmc -= pmc->idx;
+	pmu = container_of(pmc, struct kvm_pmu, pmc[0]);
+	vcpu_arch = container_of(pmu, struct kvm_vcpu_arch, pmu);
+	return container_of(vcpu_arch, struct kvm_vcpu, arch);
+}
+
+/**
+ * kvm_pmu_get_counter_value - get PMU counter value
+ * @vcpu: The vcpu pointer
+ * @select_idx: The counter index
+ */
+u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx)
+{
+	u64 counter, reg, enabled, running;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_pmc *pmc = &pmu->pmc[select_idx];
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return 0;
+
+	reg = (pmc->idx == ARMV8_PMU_CYCLE_IDX)
+		? PMCCNTR_EL0 : PMEVCNTR0_EL0 + pmc->idx;
+	counter = __vcpu_sys_reg(vcpu, reg);
+
+	/*
+	 * The real counter value is equal to the value of counter register plus
+	 * the value perf event counts.
+	 */
+	if (pmc->perf_event)
+		counter += perf_event_read_value(pmc->perf_event, &enabled,
+						 &running);
+
+	if (!kvm_pmu_idx_is_64bit(vcpu, select_idx))
+		counter = lower_32_bits(counter);
+
+	return counter;
+}
+
+/**
+ * kvm_pmu_set_counter_value - set PMU counter value
+ * @vcpu: The vcpu pointer
+ * @select_idx: The counter index
+ * @val: The counter value
+ */
+void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val)
+{
+	u64 reg;
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return;
+
+	reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
+	      ? PMCCNTR_EL0 : PMEVCNTR0_EL0 + select_idx;
+	__vcpu_sys_reg(vcpu, reg) += (s64)val - kvm_pmu_get_counter_value(vcpu, select_idx);
+
+	/* Recreate the perf event to reflect the updated sample_period */
+	kvm_pmu_create_perf_event(vcpu, select_idx);
+}
+
+/**
+ * kvm_pmu_release_perf_event - remove the perf event
+ * @pmc: The PMU counter pointer
+ */
+static void kvm_pmu_release_perf_event(struct kvm_pmc *pmc)
+{
+	if (pmc->perf_event) {
+		perf_event_disable(pmc->perf_event);
+		perf_event_release_kernel(pmc->perf_event);
+		pmc->perf_event = NULL;
+	}
+}
+
+/**
+ * kvm_pmu_stop_counter - stop PMU counter
+ * @pmc: The PMU counter pointer
+ *
+ * If this counter has been configured to monitor some event, release it here.
+ */
+static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc)
+{
+	u64 counter, reg, val;
+
+	if (!pmc->perf_event)
+		return;
+
+	counter = kvm_pmu_get_counter_value(vcpu, pmc->idx);
+
+	if (pmc->idx == ARMV8_PMU_CYCLE_IDX) {
+		reg = PMCCNTR_EL0;
+		val = counter;
+	} else {
+		reg = PMEVCNTR0_EL0 + pmc->idx;
+		val = lower_32_bits(counter);
+	}
+
+	__vcpu_sys_reg(vcpu, reg) = val;
+
+	kvm_pmu_release_perf_event(pmc);
+}
+
+/**
+ * kvm_pmu_vcpu_init - assign pmu counter idx for cpu
+ * @vcpu: The vcpu pointer
+ *
+ */
+void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu)
+{
+	int i;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+
+	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
+		pmu->pmc[i].idx = i;
+}
+
+/**
+ * kvm_pmu_vcpu_reset - reset pmu state for cpu
+ * @vcpu: The vcpu pointer
+ *
+ */
+void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu)
+{
+	unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	int i;
+
+	for_each_set_bit(i, &mask, 32)
+		kvm_pmu_stop_counter(vcpu, &pmu->pmc[i]);
+}
+
+/**
+ * kvm_pmu_vcpu_destroy - free perf event of PMU for cpu
+ * @vcpu: The vcpu pointer
+ *
+ */
+void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	int i;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+
+	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++)
+		kvm_pmu_release_perf_event(&pmu->pmc[i]);
+	irq_work_sync(&vcpu->arch.pmu.overflow_work);
+}
+
+u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
+{
+	u64 val = __vcpu_sys_reg(vcpu, PMCR_EL0) >> ARMV8_PMU_PMCR_N_SHIFT;
+
+	val &= ARMV8_PMU_PMCR_N_MASK;
+	if (val == 0)
+		return BIT(ARMV8_PMU_CYCLE_IDX);
+	else
+		return GENMASK(val - 1, 0) | BIT(ARMV8_PMU_CYCLE_IDX);
+}
+
+/**
+ * kvm_pmu_enable_counter_mask - enable selected PMU counters
+ * @vcpu: The vcpu pointer
+ * @val: the value guest writes to PMCNTENSET register
+ *
+ * Call perf_event_enable to start counting the perf event
+ */
+void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
+{
+	int i;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_pmc *pmc;
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return;
+
+	if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E) || !val)
+		return;
+
+	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) {
+		if (!(val & BIT(i)))
+			continue;
+
+		pmc = &pmu->pmc[i];
+
+		if (!pmc->perf_event) {
+			kvm_pmu_create_perf_event(vcpu, i);
+		} else {
+			perf_event_enable(pmc->perf_event);
+			if (pmc->perf_event->state != PERF_EVENT_STATE_ACTIVE)
+				kvm_debug("fail to enable perf event\n");
+		}
+	}
+}
+
+/**
+ * kvm_pmu_disable_counter_mask - disable selected PMU counters
+ * @vcpu: The vcpu pointer
+ * @val: the value guest writes to PMCNTENCLR register
+ *
+ * Call perf_event_disable to stop counting the perf event
+ */
+void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val)
+{
+	int i;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_pmc *pmc;
+
+	if (!kvm_vcpu_has_pmu(vcpu) || !val)
+		return;
+
+	for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) {
+		if (!(val & BIT(i)))
+			continue;
+
+		pmc = &pmu->pmc[i];
+
+		if (pmc->perf_event)
+			perf_event_disable(pmc->perf_event);
+	}
+}
+
+static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu)
+{
+	u64 reg = 0;
+
+	if ((__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E)) {
+		reg = __vcpu_sys_reg(vcpu, PMOVSSET_EL0);
+		reg &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
+		reg &= __vcpu_sys_reg(vcpu, PMINTENSET_EL1);
+	}
+
+	return reg;
+}
+
+static void kvm_pmu_update_state(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	bool overflow;
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return;
+
+	overflow = !!kvm_pmu_overflow_status(vcpu);
+	if (pmu->irq_level == overflow)
+		return;
+
+	pmu->irq_level = overflow;
+
+	if (likely(irqchip_in_kernel(vcpu->kvm))) {
+		int ret = kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
+					      pmu->irq_num, overflow, pmu);
+		WARN_ON(ret);
+	}
+}
+
+bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_sync_regs *sregs = &vcpu->run->s.regs;
+	bool run_level = sregs->device_irq_level & KVM_ARM_DEV_PMU;
+
+	if (likely(irqchip_in_kernel(vcpu->kvm)))
+		return false;
+
+	return pmu->irq_level != run_level;
+}
+
+/*
+ * Reflect the PMU overflow interrupt output level into the kvm_run structure
+ */
+void kvm_pmu_update_run(struct kvm_vcpu *vcpu)
+{
+	struct kvm_sync_regs *regs = &vcpu->run->s.regs;
+
+	/* Populate the timer bitmap for user space */
+	regs->device_irq_level &= ~KVM_ARM_DEV_PMU;
+	if (vcpu->arch.pmu.irq_level)
+		regs->device_irq_level |= KVM_ARM_DEV_PMU;
+}
+
+/**
+ * kvm_pmu_flush_hwstate - flush pmu state to cpu
+ * @vcpu: The vcpu pointer
+ *
+ * Check if the PMU has overflowed while we were running in the host, and inject
+ * an interrupt if that was the case.
+ */
+void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu)
+{
+	kvm_pmu_update_state(vcpu);
+}
+
+/**
+ * kvm_pmu_sync_hwstate - sync pmu state from cpu
+ * @vcpu: The vcpu pointer
+ *
+ * Check if the PMU has overflowed while we were running in the guest, and
+ * inject an interrupt if that was the case.
+ */
+void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu)
+{
+	kvm_pmu_update_state(vcpu);
+}
+
+/**
+ * When perf interrupt is an NMI, we cannot safely notify the vcpu corresponding
+ * to the event.
+ * This is why we need a callback to do it once outside of the NMI context.
+ */
+static void kvm_pmu_perf_overflow_notify_vcpu(struct irq_work *work)
+{
+	struct kvm_vcpu *vcpu;
+	struct kvm_pmu *pmu;
+
+	pmu = container_of(work, struct kvm_pmu, overflow_work);
+	vcpu = kvm_pmc_to_vcpu(pmu->pmc);
+
+	kvm_vcpu_kick(vcpu);
+}
+
+/*
+ * Perform an increment on any of the counters described in @mask,
+ * generating the overflow if required, and propagate it as a chained
+ * event if possible.
+ */
+static void kvm_pmu_counter_increment(struct kvm_vcpu *vcpu,
+				      unsigned long mask, u32 event)
+{
+	int i;
+
+	if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E))
+		return;
+
+	/* Weed out disabled counters */
+	mask &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
+
+	for_each_set_bit(i, &mask, ARMV8_PMU_CYCLE_IDX) {
+		u64 type, reg;
+
+		/* Filter on event type */
+		type = __vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i);
+		type &= kvm_pmu_event_mask(vcpu->kvm);
+		if (type != event)
+			continue;
+
+		/* Increment this counter */
+		reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) + 1;
+		reg = lower_32_bits(reg);
+		__vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg;
+
+		if (reg) /* No overflow? move on */
+			continue;
+
+		/* Mark overflow */
+		__vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i);
+
+		if (kvm_pmu_counter_can_chain(vcpu, i))
+			kvm_pmu_counter_increment(vcpu, BIT(i + 1),
+						  ARMV8_PMUV3_PERFCTR_CHAIN);
+	}
+}
+
+/* Compute the sample period for a given counter value */
+static u64 compute_period(struct kvm_vcpu *vcpu, u64 select_idx, u64 counter)
+{
+	u64 val;
+
+	if (kvm_pmu_idx_is_64bit(vcpu, select_idx)) {
+		if (!kvm_pmu_idx_has_64bit_overflow(vcpu, select_idx))
+			val = -(counter & GENMASK(31, 0));
+		else
+			val = (-counter) & GENMASK(63, 0);
+	} else {
+		val = (-counter) & GENMASK(31, 0);
+	}
+
+	return val;
+}
+
+/**
+ * When the perf event overflows, set the overflow status and inform the vcpu.
+ */
+static void kvm_pmu_perf_overflow(struct perf_event *perf_event,
+				  struct perf_sample_data *data,
+				  struct pt_regs *regs)
+{
+	struct kvm_pmc *pmc = perf_event->overflow_handler_context;
+	struct arm_pmu *cpu_pmu = to_arm_pmu(perf_event->pmu);
+	struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc);
+	int idx = pmc->idx;
+	u64 period;
+
+	cpu_pmu->pmu.stop(perf_event, PERF_EF_UPDATE);
+
+	/*
+	 * Reset the sample period to the architectural limit,
+	 * i.e. the point where the counter overflows.
+	 */
+	period = compute_period(vcpu, idx, local64_read(&perf_event->count));
+
+	local64_set(&perf_event->hw.period_left, 0);
+	perf_event->attr.sample_period = period;
+	perf_event->hw.sample_period = period;
+
+	__vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(idx);
+
+	if (kvm_pmu_counter_can_chain(vcpu, idx))
+		kvm_pmu_counter_increment(vcpu, BIT(idx + 1),
+					  ARMV8_PMUV3_PERFCTR_CHAIN);
+
+	if (kvm_pmu_overflow_status(vcpu)) {
+		kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
+
+		if (!in_nmi())
+			kvm_vcpu_kick(vcpu);
+		else
+			irq_work_queue(&vcpu->arch.pmu.overflow_work);
+	}
+
+	cpu_pmu->pmu.start(perf_event, PERF_EF_RELOAD);
+}
+
+/**
+ * kvm_pmu_software_increment - do software increment
+ * @vcpu: The vcpu pointer
+ * @val: the value guest writes to PMSWINC register
+ */
+void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val)
+{
+	kvm_pmu_counter_increment(vcpu, val, ARMV8_PMUV3_PERFCTR_SW_INCR);
+}
+
+/**
+ * kvm_pmu_handle_pmcr - handle PMCR register
+ * @vcpu: The vcpu pointer
+ * @val: the value guest writes to PMCR register
+ */
+void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
+{
+	int i;
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return;
+
+	/* The reset bits don't indicate any state, and shouldn't be saved. */
+	__vcpu_sys_reg(vcpu, PMCR_EL0) = val & ~(ARMV8_PMU_PMCR_C | ARMV8_PMU_PMCR_P);
+
+	if (val & ARMV8_PMU_PMCR_E) {
+		kvm_pmu_enable_counter_mask(vcpu,
+		       __vcpu_sys_reg(vcpu, PMCNTENSET_EL0));
+	} else {
+		kvm_pmu_disable_counter_mask(vcpu,
+		       __vcpu_sys_reg(vcpu, PMCNTENSET_EL0));
+	}
+
+	if (val & ARMV8_PMU_PMCR_C)
+		kvm_pmu_set_counter_value(vcpu, ARMV8_PMU_CYCLE_IDX, 0);
+
+	if (val & ARMV8_PMU_PMCR_P) {
+		unsigned long mask = kvm_pmu_valid_counter_mask(vcpu);
+		mask &= ~BIT(ARMV8_PMU_CYCLE_IDX);
+		for_each_set_bit(i, &mask, 32)
+			kvm_pmu_set_counter_value(vcpu, i, 0);
+	}
+	kvm_vcpu_pmu_restore_guest(vcpu);
+}
+
+static bool kvm_pmu_counter_is_enabled(struct kvm_vcpu *vcpu, u64 select_idx)
+{
+	return (__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E) &&
+	       (__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & BIT(select_idx));
+}
+
+/**
+ * kvm_pmu_create_perf_event - create a perf event for a counter
+ * @vcpu: The vcpu pointer
+ * @select_idx: The number of selected counter
+ */
+static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx)
+{
+	struct arm_pmu *arm_pmu = vcpu->kvm->arch.arm_pmu;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_pmc *pmc = &pmu->pmc[select_idx];
+	struct perf_event *event;
+	struct perf_event_attr attr;
+	u64 eventsel, counter, reg, data;
+
+	reg = (pmc->idx == ARMV8_PMU_CYCLE_IDX)
+	      ? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + pmc->idx;
+	data = __vcpu_sys_reg(vcpu, reg);
+
+	kvm_pmu_stop_counter(vcpu, pmc);
+	if (pmc->idx == ARMV8_PMU_CYCLE_IDX)
+		eventsel = ARMV8_PMUV3_PERFCTR_CPU_CYCLES;
+	else
+		eventsel = data & kvm_pmu_event_mask(vcpu->kvm);
+
+	/*
+	 * Neither SW increment nor chained events need to be backed
+	 * by a perf event.
+	 */
+	if (eventsel == ARMV8_PMUV3_PERFCTR_SW_INCR ||
+	    eventsel == ARMV8_PMUV3_PERFCTR_CHAIN)
+		return;
+
+	/*
+	 * If we have a filter in place and that the event isn't allowed, do
+	 * not install a perf event either.
+	 */
+	if (vcpu->kvm->arch.pmu_filter &&
+	    !test_bit(eventsel, vcpu->kvm->arch.pmu_filter))
+		return;
+
+	memset(&attr, 0, sizeof(struct perf_event_attr));
+	attr.type = arm_pmu->pmu.type;
+	attr.size = sizeof(attr);
+	attr.pinned = 1;
+	attr.disabled = !kvm_pmu_counter_is_enabled(vcpu, pmc->idx);
+	attr.exclude_user = data & ARMV8_PMU_EXCLUDE_EL0 ? 1 : 0;
+	attr.exclude_kernel = data & ARMV8_PMU_EXCLUDE_EL1 ? 1 : 0;
+	attr.exclude_hv = 1; /* Don't count EL2 events */
+	attr.exclude_host = 1; /* Don't count host events */
+	attr.config = eventsel;
+
+	counter = kvm_pmu_get_counter_value(vcpu, select_idx);
+
+	/*
+	 * If counting with a 64bit counter, advertise it to the perf
+	 * code, carefully dealing with the initial sample period
+	 * which also depends on the overflow.
+	 */
+	if (kvm_pmu_idx_is_64bit(vcpu, select_idx))
+		attr.config1 |= PERF_ATTR_CFG1_COUNTER_64BIT;
+
+	attr.sample_period = compute_period(vcpu, select_idx, counter);
+
+	event = perf_event_create_kernel_counter(&attr, -1, current,
+						 kvm_pmu_perf_overflow, pmc);
+
+	if (IS_ERR(event)) {
+		pr_err_once("kvm: pmu event creation failed %ld\n",
+			    PTR_ERR(event));
+		return;
+	}
+
+	pmc->perf_event = event;
+}
+
+/**
+ * kvm_pmu_set_counter_event_type - set selected counter to monitor some event
+ * @vcpu: The vcpu pointer
+ * @data: The data guest writes to PMXEVTYPER_EL0
+ * @select_idx: The number of selected counter
+ *
+ * When OS accesses PMXEVTYPER_EL0, that means it wants to set a PMC to count an
+ * event with given hardware event number. Here we call perf_event API to
+ * emulate this action and create a kernel perf event for it.
+ */
+void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
+				    u64 select_idx)
+{
+	u64 reg, mask;
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return;
+
+	mask  =  ARMV8_PMU_EVTYPE_MASK;
+	mask &= ~ARMV8_PMU_EVTYPE_EVENT;
+	mask |= kvm_pmu_event_mask(vcpu->kvm);
+
+	reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
+	      ? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + select_idx;
+
+	__vcpu_sys_reg(vcpu, reg) = data & mask;
+
+	kvm_pmu_create_perf_event(vcpu, select_idx);
+}
+
+void kvm_host_pmu_init(struct arm_pmu *pmu)
+{
+	struct arm_pmu_entry *entry;
+
+	if (pmu->pmuver == 0 || pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF)
+		return;
+
+	mutex_lock(&arm_pmus_lock);
+
+	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		goto out_unlock;
+
+	entry->arm_pmu = pmu;
+	list_add_tail(&entry->entry, &arm_pmus);
+
+	if (list_is_singular(&arm_pmus))
+		static_branch_enable(&kvm_arm_pmu_available);
+
+out_unlock:
+	mutex_unlock(&arm_pmus_lock);
+}
+
+static struct arm_pmu *kvm_pmu_probe_armpmu(void)
+{
+	struct perf_event_attr attr = { };
+	struct perf_event *event;
+	struct arm_pmu *pmu = NULL;
+
+	/*
+	 * Create a dummy event that only counts user cycles. As we'll never
+	 * leave this function with the event being live, it will never
+	 * count anything. But it allows us to probe some of the PMU
+	 * details. Yes, this is terrible.
+	 */
+	attr.type = PERF_TYPE_RAW;
+	attr.size = sizeof(attr);
+	attr.pinned = 1;
+	attr.disabled = 0;
+	attr.exclude_user = 0;
+	attr.exclude_kernel = 1;
+	attr.exclude_hv = 1;
+	attr.exclude_host = 1;
+	attr.config = ARMV8_PMUV3_PERFCTR_CPU_CYCLES;
+	attr.sample_period = GENMASK(63, 0);
+
+	event = perf_event_create_kernel_counter(&attr, -1, current,
+						 kvm_pmu_perf_overflow, &attr);
+
+	if (IS_ERR(event)) {
+		pr_err_once("kvm: pmu event creation failed %ld\n",
+			    PTR_ERR(event));
+		return NULL;
+	}
+
+	if (event->pmu) {
+		pmu = to_arm_pmu(event->pmu);
+		if (pmu->pmuver == 0 ||
+		    pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF)
+			pmu = NULL;
+	}
+
+	perf_event_disable(event);
+	perf_event_release_kernel(event);
+
+	return pmu;
+}
+
+u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
+{
+	unsigned long *bmap = vcpu->kvm->arch.pmu_filter;
+	u64 val, mask = 0;
+	int base, i, nr_events;
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return 0;
+
+	if (!pmceid1) {
+		val = read_sysreg(pmceid0_el0);
+		base = 0;
+	} else {
+		val = read_sysreg(pmceid1_el0);
+		/*
+		 * Don't advertise STALL_SLOT, as PMMIR_EL0 is handled
+		 * as RAZ
+		 */
+		if (vcpu->kvm->arch.arm_pmu->pmuver >= ID_AA64DFR0_EL1_PMUVer_V3P4)
+			val &= ~BIT_ULL(ARMV8_PMUV3_PERFCTR_STALL_SLOT - 32);
+		base = 32;
+	}
+
+	if (!bmap)
+		return val;
+
+	nr_events = kvm_pmu_event_mask(vcpu->kvm) + 1;
+
+	for (i = 0; i < 32; i += 8) {
+		u64 byte;
+
+		byte = bitmap_get_value8(bmap, base + i);
+		mask |= byte << i;
+		if (nr_events >= (0x4000 + base + 32)) {
+			byte = bitmap_get_value8(bmap, 0x4000 + base + i);
+			mask |= byte << (32 + i);
+		}
+	}
+
+	return val & mask;
+}
+
+int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
+{
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return 0;
+
+	if (!vcpu->arch.pmu.created)
+		return -EINVAL;
+
+	/*
+	 * A valid interrupt configuration for the PMU is either to have a
+	 * properly configured interrupt number and using an in-kernel
+	 * irqchip, or to not have an in-kernel GIC and not set an IRQ.
+	 */
+	if (irqchip_in_kernel(vcpu->kvm)) {
+		int irq = vcpu->arch.pmu.irq_num;
+		/*
+		 * If we are using an in-kernel vgic, at this point we know
+		 * the vgic will be initialized, so we can check the PMU irq
+		 * number against the dimensions of the vgic and make sure
+		 * it's valid.
+		 */
+		if (!irq_is_ppi(irq) && !vgic_valid_spi(vcpu->kvm, irq))
+			return -EINVAL;
+	} else if (kvm_arm_pmu_irq_initialized(vcpu)) {
+		   return -EINVAL;
+	}
+
+	/* One-off reload of the PMU on first run */
+	kvm_make_request(KVM_REQ_RELOAD_PMU, vcpu);
+
+	return 0;
+}
+
+static int kvm_arm_pmu_v3_init(struct kvm_vcpu *vcpu)
+{
+	if (irqchip_in_kernel(vcpu->kvm)) {
+		int ret;
+
+		/*
+		 * If using the PMU with an in-kernel virtual GIC
+		 * implementation, we require the GIC to be already
+		 * initialized when initializing the PMU.
+		 */
+		if (!vgic_initialized(vcpu->kvm))
+			return -ENODEV;
+
+		if (!kvm_arm_pmu_irq_initialized(vcpu))
+			return -ENXIO;
+
+		ret = kvm_vgic_set_owner(vcpu, vcpu->arch.pmu.irq_num,
+					 &vcpu->arch.pmu);
+		if (ret)
+			return ret;
+	}
+
+	init_irq_work(&vcpu->arch.pmu.overflow_work,
+		      kvm_pmu_perf_overflow_notify_vcpu);
+
+	vcpu->arch.pmu.created = true;
+	return 0;
+}
+
+/*
+ * For one VM the interrupt type must be same for each vcpu.
+ * As a PPI, the interrupt number is the same for all vcpus,
+ * while as an SPI it must be a separate number per vcpu.
+ */
+static bool pmu_irq_is_valid(struct kvm *kvm, int irq)
+{
+	unsigned long i;
+	struct kvm_vcpu *vcpu;
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (!kvm_arm_pmu_irq_initialized(vcpu))
+			continue;
+
+		if (irq_is_ppi(irq)) {
+			if (vcpu->arch.pmu.irq_num != irq)
+				return false;
+		} else {
+			if (vcpu->arch.pmu.irq_num == irq)
+				return false;
+		}
+	}
+
+	return true;
+}
+
+static int kvm_arm_pmu_v3_set_pmu(struct kvm_vcpu *vcpu, int pmu_id)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct arm_pmu_entry *entry;
+	struct arm_pmu *arm_pmu;
+	int ret = -ENXIO;
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+	mutex_lock(&arm_pmus_lock);
+
+	list_for_each_entry(entry, &arm_pmus, entry) {
+		arm_pmu = entry->arm_pmu;
+		if (arm_pmu->pmu.type == pmu_id) {
+			if (test_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags) ||
+			    (kvm->arch.pmu_filter && kvm->arch.arm_pmu != arm_pmu)) {
+				ret = -EBUSY;
+				break;
+			}
+
+			kvm->arch.arm_pmu = arm_pmu;
+			cpumask_copy(kvm->arch.supported_cpus, &arm_pmu->supported_cpus);
+			ret = 0;
+			break;
+		}
+	}
+
+	mutex_unlock(&arm_pmus_lock);
+	return ret;
+}
+
+int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+	struct kvm *kvm = vcpu->kvm;
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+
+	if (!kvm_vcpu_has_pmu(vcpu))
+		return -ENODEV;
+
+	if (vcpu->arch.pmu.created)
+		return -EBUSY;
+
+	if (!kvm->arch.arm_pmu) {
+		/* No PMU set, get the default one */
+		kvm->arch.arm_pmu = kvm_pmu_probe_armpmu();
+		if (!kvm->arch.arm_pmu)
+			return -ENODEV;
+	}
+
+	switch (attr->attr) {
+	case KVM_ARM_VCPU_PMU_V3_IRQ: {
+		int __user *uaddr = (int __user *)(long)attr->addr;
+		int irq;
+
+		if (!irqchip_in_kernel(kvm))
+			return -EINVAL;
+
+		if (get_user(irq, uaddr))
+			return -EFAULT;
+
+		/* The PMU overflow interrupt can be a PPI or a valid SPI. */
+		if (!(irq_is_ppi(irq) || irq_is_spi(irq)))
+			return -EINVAL;
+
+		if (!pmu_irq_is_valid(kvm, irq))
+			return -EINVAL;
+
+		if (kvm_arm_pmu_irq_initialized(vcpu))
+			return -EBUSY;
+
+		kvm_debug("Set kvm ARM PMU irq: %d\n", irq);
+		vcpu->arch.pmu.irq_num = irq;
+		return 0;
+	}
+	case KVM_ARM_VCPU_PMU_V3_FILTER: {
+		struct kvm_pmu_event_filter __user *uaddr;
+		struct kvm_pmu_event_filter filter;
+		int nr_events;
+
+		nr_events = kvm_pmu_event_mask(kvm) + 1;
+
+		uaddr = (struct kvm_pmu_event_filter __user *)(long)attr->addr;
+
+		if (copy_from_user(&filter, uaddr, sizeof(filter)))
+			return -EFAULT;
+
+		if (((u32)filter.base_event + filter.nevents) > nr_events ||
+		    (filter.action != KVM_PMU_EVENT_ALLOW &&
+		     filter.action != KVM_PMU_EVENT_DENY))
+			return -EINVAL;
+
+		if (test_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags))
+			return -EBUSY;
+
+		if (!kvm->arch.pmu_filter) {
+			kvm->arch.pmu_filter = bitmap_alloc(nr_events, GFP_KERNEL_ACCOUNT);
+			if (!kvm->arch.pmu_filter)
+				return -ENOMEM;
+
+			/*
+			 * The default depends on the first applied filter.
+			 * If it allows events, the default is to deny.
+			 * Conversely, if the first filter denies a set of
+			 * events, the default is to allow.
+			 */
+			if (filter.action == KVM_PMU_EVENT_ALLOW)
+				bitmap_zero(kvm->arch.pmu_filter, nr_events);
+			else
+				bitmap_fill(kvm->arch.pmu_filter, nr_events);
+		}
+
+		if (filter.action == KVM_PMU_EVENT_ALLOW)
+			bitmap_set(kvm->arch.pmu_filter, filter.base_event, filter.nevents);
+		else
+			bitmap_clear(kvm->arch.pmu_filter, filter.base_event, filter.nevents);
+
+		return 0;
+	}
+	case KVM_ARM_VCPU_PMU_V3_SET_PMU: {
+		int __user *uaddr = (int __user *)(long)attr->addr;
+		int pmu_id;
+
+		if (get_user(pmu_id, uaddr))
+			return -EFAULT;
+
+		return kvm_arm_pmu_v3_set_pmu(vcpu, pmu_id);
+	}
+	case KVM_ARM_VCPU_PMU_V3_INIT:
+		return kvm_arm_pmu_v3_init(vcpu);
+	}
+
+	return -ENXIO;
+}
+
+int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+	switch (attr->attr) {
+	case KVM_ARM_VCPU_PMU_V3_IRQ: {
+		int __user *uaddr = (int __user *)(long)attr->addr;
+		int irq;
+
+		if (!irqchip_in_kernel(vcpu->kvm))
+			return -EINVAL;
+
+		if (!kvm_vcpu_has_pmu(vcpu))
+			return -ENODEV;
+
+		if (!kvm_arm_pmu_irq_initialized(vcpu))
+			return -ENXIO;
+
+		irq = vcpu->arch.pmu.irq_num;
+		return put_user(irq, uaddr);
+	}
+	}
+
+	return -ENXIO;
+}
+
+int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+	switch (attr->attr) {
+	case KVM_ARM_VCPU_PMU_V3_IRQ:
+	case KVM_ARM_VCPU_PMU_V3_INIT:
+	case KVM_ARM_VCPU_PMU_V3_FILTER:
+	case KVM_ARM_VCPU_PMU_V3_SET_PMU:
+		if (kvm_vcpu_has_pmu(vcpu))
+			return 0;
+	}
+
+	return -ENXIO;
+}
diff --git a/arch/arm64/kvm/pmu.c b/arch/arm64/kvm/pmu.c
new file mode 100644
index 000000000..7887133d1
--- /dev/null
+++ b/arch/arm64/kvm/pmu.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Arm Limited
+ * Author: Andrew Murray <Andrew.Murray@arm.com>
+ */
+#include <linux/kvm_host.h>
+#include <linux/perf_event.h>
+
+static DEFINE_PER_CPU(struct kvm_pmu_events, kvm_pmu_events);
+
+/*
+ * Given the perf event attributes and system type, determine
+ * if we are going to need to switch counters at guest entry/exit.
+ */
+static bool kvm_pmu_switch_needed(struct perf_event_attr *attr)
+{
+	/**
+	 * With VHE the guest kernel runs at EL1 and the host at EL2,
+	 * where user (EL0) is excluded then we have no reason to switch
+	 * counters.
+	 */
+	if (has_vhe() && attr->exclude_user)
+		return false;
+
+	/* Only switch if attributes are different */
+	return (attr->exclude_host != attr->exclude_guest);
+}
+
+struct kvm_pmu_events *kvm_get_pmu_events(void)
+{
+	return this_cpu_ptr(&kvm_pmu_events);
+}
+
+/*
+ * Add events to track that we may want to switch at guest entry/exit
+ * time.
+ */
+void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr)
+{
+	struct kvm_pmu_events *pmu = kvm_get_pmu_events();
+
+	if (!kvm_arm_support_pmu_v3() || !pmu || !kvm_pmu_switch_needed(attr))
+		return;
+
+	if (!attr->exclude_host)
+		pmu->events_host |= set;
+	if (!attr->exclude_guest)
+		pmu->events_guest |= set;
+}
+
+/*
+ * Stop tracking events
+ */
+void kvm_clr_pmu_events(u32 clr)
+{
+	struct kvm_pmu_events *pmu = kvm_get_pmu_events();
+
+	if (!kvm_arm_support_pmu_v3() || !pmu)
+		return;
+
+	pmu->events_host &= ~clr;
+	pmu->events_guest &= ~clr;
+}
+
+#define PMEVTYPER_READ_CASE(idx)				\
+	case idx:						\
+		return read_sysreg(pmevtyper##idx##_el0)
+
+#define PMEVTYPER_WRITE_CASE(idx)				\
+	case idx:						\
+		write_sysreg(val, pmevtyper##idx##_el0);	\
+		break
+
+#define PMEVTYPER_CASES(readwrite)				\
+	PMEVTYPER_##readwrite##_CASE(0);			\
+	PMEVTYPER_##readwrite##_CASE(1);			\
+	PMEVTYPER_##readwrite##_CASE(2);			\
+	PMEVTYPER_##readwrite##_CASE(3);			\
+	PMEVTYPER_##readwrite##_CASE(4);			\
+	PMEVTYPER_##readwrite##_CASE(5);			\
+	PMEVTYPER_##readwrite##_CASE(6);			\
+	PMEVTYPER_##readwrite##_CASE(7);			\
+	PMEVTYPER_##readwrite##_CASE(8);			\
+	PMEVTYPER_##readwrite##_CASE(9);			\
+	PMEVTYPER_##readwrite##_CASE(10);			\
+	PMEVTYPER_##readwrite##_CASE(11);			\
+	PMEVTYPER_##readwrite##_CASE(12);			\
+	PMEVTYPER_##readwrite##_CASE(13);			\
+	PMEVTYPER_##readwrite##_CASE(14);			\
+	PMEVTYPER_##readwrite##_CASE(15);			\
+	PMEVTYPER_##readwrite##_CASE(16);			\
+	PMEVTYPER_##readwrite##_CASE(17);			\
+	PMEVTYPER_##readwrite##_CASE(18);			\
+	PMEVTYPER_##readwrite##_CASE(19);			\
+	PMEVTYPER_##readwrite##_CASE(20);			\
+	PMEVTYPER_##readwrite##_CASE(21);			\
+	PMEVTYPER_##readwrite##_CASE(22);			\
+	PMEVTYPER_##readwrite##_CASE(23);			\
+	PMEVTYPER_##readwrite##_CASE(24);			\
+	PMEVTYPER_##readwrite##_CASE(25);			\
+	PMEVTYPER_##readwrite##_CASE(26);			\
+	PMEVTYPER_##readwrite##_CASE(27);			\
+	PMEVTYPER_##readwrite##_CASE(28);			\
+	PMEVTYPER_##readwrite##_CASE(29);			\
+	PMEVTYPER_##readwrite##_CASE(30)
+
+/*
+ * Read a value direct from PMEVTYPER<idx> where idx is 0-30
+ * or PMCCFILTR_EL0 where idx is ARMV8_PMU_CYCLE_IDX (31).
+ */
+static u64 kvm_vcpu_pmu_read_evtype_direct(int idx)
+{
+	switch (idx) {
+	PMEVTYPER_CASES(READ);
+	case ARMV8_PMU_CYCLE_IDX:
+		return read_sysreg(pmccfiltr_el0);
+	default:
+		WARN_ON(1);
+	}
+
+	return 0;
+}
+
+/*
+ * Write a value direct to PMEVTYPER<idx> where idx is 0-30
+ * or PMCCFILTR_EL0 where idx is ARMV8_PMU_CYCLE_IDX (31).
+ */
+static void kvm_vcpu_pmu_write_evtype_direct(int idx, u32 val)
+{
+	switch (idx) {
+	PMEVTYPER_CASES(WRITE);
+	case ARMV8_PMU_CYCLE_IDX:
+		write_sysreg(val, pmccfiltr_el0);
+		break;
+	default:
+		WARN_ON(1);
+	}
+}
+
+/*
+ * Modify ARMv8 PMU events to include EL0 counting
+ */
+static void kvm_vcpu_pmu_enable_el0(unsigned long events)
+{
+	u64 typer;
+	u32 counter;
+
+	for_each_set_bit(counter, &events, 32) {
+		typer = kvm_vcpu_pmu_read_evtype_direct(counter);
+		typer &= ~ARMV8_PMU_EXCLUDE_EL0;
+		kvm_vcpu_pmu_write_evtype_direct(counter, typer);
+	}
+}
+
+/*
+ * Modify ARMv8 PMU events to exclude EL0 counting
+ */
+static void kvm_vcpu_pmu_disable_el0(unsigned long events)
+{
+	u64 typer;
+	u32 counter;
+
+	for_each_set_bit(counter, &events, 32) {
+		typer = kvm_vcpu_pmu_read_evtype_direct(counter);
+		typer |= ARMV8_PMU_EXCLUDE_EL0;
+		kvm_vcpu_pmu_write_evtype_direct(counter, typer);
+	}
+}
+
+/*
+ * On VHE ensure that only guest events have EL0 counting enabled.
+ * This is called from both vcpu_{load,put} and the sysreg handling.
+ * Since the latter is preemptible, special care must be taken to
+ * disable preemption.
+ */
+void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu_events *pmu;
+	u32 events_guest, events_host;
+
+	if (!kvm_arm_support_pmu_v3() || !has_vhe())
+		return;
+
+	preempt_disable();
+	pmu = kvm_get_pmu_events();
+	events_guest = pmu->events_guest;
+	events_host = pmu->events_host;
+
+	kvm_vcpu_pmu_enable_el0(events_guest);
+	kvm_vcpu_pmu_disable_el0(events_host);
+	preempt_enable();
+}
+
+/*
+ * On VHE ensure that only host events have EL0 counting enabled
+ */
+void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu_events *pmu;
+	u32 events_guest, events_host;
+
+	if (!kvm_arm_support_pmu_v3() || !has_vhe())
+		return;
+
+	pmu = kvm_get_pmu_events();
+	events_guest = pmu->events_guest;
+	events_host = pmu->events_host;
+
+	kvm_vcpu_pmu_enable_el0(events_host);
+	kvm_vcpu_pmu_disable_el0(events_guest);
+}
diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c
new file mode 100644
index 000000000..5767e6baa
--- /dev/null
+++ b/arch/arm64/kvm/psci.c
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/preempt.h>
+#include <linux/kvm_host.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+
+#include <asm/cputype.h>
+#include <asm/kvm_emulate.h>
+
+#include <kvm/arm_psci.h>
+#include <kvm/arm_hypercalls.h>
+
+/*
+ * This is an implementation of the Power State Coordination Interface
+ * as described in ARM document number ARM DEN 0022A.
+ */
+
+#define AFFINITY_MASK(level)	~((0x1UL << ((level) * MPIDR_LEVEL_BITS)) - 1)
+
+static unsigned long psci_affinity_mask(unsigned long affinity_level)
+{
+	if (affinity_level <= 3)
+		return MPIDR_HWID_BITMASK & AFFINITY_MASK(affinity_level);
+
+	return 0;
+}
+
+static unsigned long kvm_psci_vcpu_suspend(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * NOTE: For simplicity, we make VCPU suspend emulation to be
+	 * same-as WFI (Wait-for-interrupt) emulation.
+	 *
+	 * This means for KVM the wakeup events are interrupts and
+	 * this is consistent with intended use of StateID as described
+	 * in section 5.4.1 of PSCI v0.2 specification (ARM DEN 0022A).
+	 *
+	 * Further, we also treat power-down request to be same as
+	 * stand-by request as-per section 5.4.2 clause 3 of PSCI v0.2
+	 * specification (ARM DEN 0022A). This means all suspend states
+	 * for KVM will preserve the register state.
+	 */
+	kvm_vcpu_wfi(vcpu);
+
+	return PSCI_RET_SUCCESS;
+}
+
+static inline bool kvm_psci_valid_affinity(struct kvm_vcpu *vcpu,
+					   unsigned long affinity)
+{
+	return !(affinity & ~MPIDR_HWID_BITMASK);
+}
+
+static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
+{
+	struct vcpu_reset_state *reset_state;
+	struct kvm *kvm = source_vcpu->kvm;
+	struct kvm_vcpu *vcpu = NULL;
+	int ret = PSCI_RET_SUCCESS;
+	unsigned long cpu_id;
+
+	cpu_id = smccc_get_arg1(source_vcpu);
+	if (!kvm_psci_valid_affinity(source_vcpu, cpu_id))
+		return PSCI_RET_INVALID_PARAMS;
+
+	vcpu = kvm_mpidr_to_vcpu(kvm, cpu_id);
+
+	/*
+	 * Make sure the caller requested a valid CPU and that the CPU is
+	 * turned off.
+	 */
+	if (!vcpu)
+		return PSCI_RET_INVALID_PARAMS;
+
+	spin_lock(&vcpu->arch.mp_state_lock);
+	if (!kvm_arm_vcpu_stopped(vcpu)) {
+		if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1)
+			ret = PSCI_RET_ALREADY_ON;
+		else
+			ret = PSCI_RET_INVALID_PARAMS;
+
+		goto out_unlock;
+	}
+
+	reset_state = &vcpu->arch.reset_state;
+
+	reset_state->pc = smccc_get_arg2(source_vcpu);
+
+	/* Propagate caller endianness */
+	reset_state->be = kvm_vcpu_is_be(source_vcpu);
+
+	/*
+	 * NOTE: We always update r0 (or x0) because for PSCI v0.1
+	 * the general purpose registers are undefined upon CPU_ON.
+	 */
+	reset_state->r0 = smccc_get_arg3(source_vcpu);
+
+	reset_state->reset = true;
+	kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
+
+	/*
+	 * Make sure the reset request is observed if the RUNNABLE mp_state is
+	 * observed.
+	 */
+	smp_wmb();
+
+	vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
+	kvm_vcpu_wake_up(vcpu);
+
+out_unlock:
+	spin_unlock(&vcpu->arch.mp_state_lock);
+	return ret;
+}
+
+static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
+{
+	int matching_cpus = 0;
+	unsigned long i, mpidr;
+	unsigned long target_affinity;
+	unsigned long target_affinity_mask;
+	unsigned long lowest_affinity_level;
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_vcpu *tmp;
+
+	target_affinity = smccc_get_arg1(vcpu);
+	lowest_affinity_level = smccc_get_arg2(vcpu);
+
+	if (!kvm_psci_valid_affinity(vcpu, target_affinity))
+		return PSCI_RET_INVALID_PARAMS;
+
+	/* Determine target affinity mask */
+	target_affinity_mask = psci_affinity_mask(lowest_affinity_level);
+	if (!target_affinity_mask)
+		return PSCI_RET_INVALID_PARAMS;
+
+	/* Ignore other bits of target affinity */
+	target_affinity &= target_affinity_mask;
+
+	/*
+	 * If one or more VCPU matching target affinity are running
+	 * then ON else OFF
+	 */
+	kvm_for_each_vcpu(i, tmp, kvm) {
+		mpidr = kvm_vcpu_get_mpidr_aff(tmp);
+		if ((mpidr & target_affinity_mask) == target_affinity) {
+			matching_cpus++;
+			if (!kvm_arm_vcpu_stopped(tmp))
+				return PSCI_0_2_AFFINITY_LEVEL_ON;
+		}
+	}
+
+	if (!matching_cpus)
+		return PSCI_RET_INVALID_PARAMS;
+
+	return PSCI_0_2_AFFINITY_LEVEL_OFF;
+}
+
+static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type, u64 flags)
+{
+	unsigned long i;
+	struct kvm_vcpu *tmp;
+
+	/*
+	 * The KVM ABI specifies that a system event exit may call KVM_RUN
+	 * again and may perform shutdown/reboot at a later time that when the
+	 * actual request is made.  Since we are implementing PSCI and a
+	 * caller of PSCI reboot and shutdown expects that the system shuts
+	 * down or reboots immediately, let's make sure that VCPUs are not run
+	 * after this call is handled and before the VCPUs have been
+	 * re-initialized.
+	 */
+	kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
+		spin_lock(&tmp->arch.mp_state_lock);
+		WRITE_ONCE(tmp->arch.mp_state.mp_state, KVM_MP_STATE_STOPPED);
+		spin_unlock(&tmp->arch.mp_state_lock);
+	}
+	kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
+
+	memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
+	vcpu->run->system_event.type = type;
+	vcpu->run->system_event.ndata = 1;
+	vcpu->run->system_event.data[0] = flags;
+	vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+}
+
+static void kvm_psci_system_off(struct kvm_vcpu *vcpu)
+{
+	kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_SHUTDOWN, 0);
+}
+
+static void kvm_psci_system_reset(struct kvm_vcpu *vcpu)
+{
+	kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_RESET, 0);
+}
+
+static void kvm_psci_system_reset2(struct kvm_vcpu *vcpu)
+{
+	kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_RESET,
+				 KVM_SYSTEM_EVENT_RESET_FLAG_PSCI_RESET2);
+}
+
+static void kvm_psci_system_suspend(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+
+	memset(&run->system_event, 0, sizeof(vcpu->run->system_event));
+	run->system_event.type = KVM_SYSTEM_EVENT_SUSPEND;
+	run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+}
+
+static void kvm_psci_narrow_to_32bit(struct kvm_vcpu *vcpu)
+{
+	int i;
+
+	/*
+	 * Zero the input registers' upper 32 bits. They will be fully
+	 * zeroed on exit, so we're fine changing them in place.
+	 */
+	for (i = 1; i < 4; i++)
+		vcpu_set_reg(vcpu, i, lower_32_bits(vcpu_get_reg(vcpu, i)));
+}
+
+static unsigned long kvm_psci_check_allowed_function(struct kvm_vcpu *vcpu, u32 fn)
+{
+	/*
+	 * Prevent 32 bit guests from calling 64 bit PSCI functions.
+	 */
+	if ((fn & PSCI_0_2_64BIT) && vcpu_mode_is_32bit(vcpu))
+		return PSCI_RET_NOT_SUPPORTED;
+
+	return 0;
+}
+
+static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
+{
+	u32 psci_fn = smccc_get_function(vcpu);
+	unsigned long val;
+	int ret = 1;
+
+	switch (psci_fn) {
+	case PSCI_0_2_FN_PSCI_VERSION:
+		/*
+		 * Bits[31:16] = Major Version = 0
+		 * Bits[15:0] = Minor Version = 2
+		 */
+		val = KVM_ARM_PSCI_0_2;
+		break;
+	case PSCI_0_2_FN_CPU_SUSPEND:
+	case PSCI_0_2_FN64_CPU_SUSPEND:
+		val = kvm_psci_vcpu_suspend(vcpu);
+		break;
+	case PSCI_0_2_FN_CPU_OFF:
+		kvm_arm_vcpu_power_off(vcpu);
+		val = PSCI_RET_SUCCESS;
+		break;
+	case PSCI_0_2_FN_CPU_ON:
+		kvm_psci_narrow_to_32bit(vcpu);
+		fallthrough;
+	case PSCI_0_2_FN64_CPU_ON:
+		val = kvm_psci_vcpu_on(vcpu);
+		break;
+	case PSCI_0_2_FN_AFFINITY_INFO:
+		kvm_psci_narrow_to_32bit(vcpu);
+		fallthrough;
+	case PSCI_0_2_FN64_AFFINITY_INFO:
+		val = kvm_psci_vcpu_affinity_info(vcpu);
+		break;
+	case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+		/*
+		 * Trusted OS is MP hence does not require migration
+	         * or
+		 * Trusted OS is not present
+		 */
+		val = PSCI_0_2_TOS_MP;
+		break;
+	case PSCI_0_2_FN_SYSTEM_OFF:
+		kvm_psci_system_off(vcpu);
+		/*
+		 * We shouldn't be going back to guest VCPU after
+		 * receiving SYSTEM_OFF request.
+		 *
+		 * If user space accidentally/deliberately resumes
+		 * guest VCPU after SYSTEM_OFF request then guest
+		 * VCPU should see internal failure from PSCI return
+		 * value. To achieve this, we preload r0 (or x0) with
+		 * PSCI return value INTERNAL_FAILURE.
+		 */
+		val = PSCI_RET_INTERNAL_FAILURE;
+		ret = 0;
+		break;
+	case PSCI_0_2_FN_SYSTEM_RESET:
+		kvm_psci_system_reset(vcpu);
+		/*
+		 * Same reason as SYSTEM_OFF for preloading r0 (or x0)
+		 * with PSCI return value INTERNAL_FAILURE.
+		 */
+		val = PSCI_RET_INTERNAL_FAILURE;
+		ret = 0;
+		break;
+	default:
+		val = PSCI_RET_NOT_SUPPORTED;
+		break;
+	}
+
+	smccc_set_retval(vcpu, val, 0, 0, 0);
+	return ret;
+}
+
+static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
+{
+	unsigned long val = PSCI_RET_NOT_SUPPORTED;
+	u32 psci_fn = smccc_get_function(vcpu);
+	struct kvm *kvm = vcpu->kvm;
+	u32 arg;
+	int ret = 1;
+
+	switch(psci_fn) {
+	case PSCI_0_2_FN_PSCI_VERSION:
+		val = minor == 0 ? KVM_ARM_PSCI_1_0 : KVM_ARM_PSCI_1_1;
+		break;
+	case PSCI_1_0_FN_PSCI_FEATURES:
+		arg = smccc_get_arg1(vcpu);
+		val = kvm_psci_check_allowed_function(vcpu, arg);
+		if (val)
+			break;
+
+		val = PSCI_RET_NOT_SUPPORTED;
+
+		switch(arg) {
+		case PSCI_0_2_FN_PSCI_VERSION:
+		case PSCI_0_2_FN_CPU_SUSPEND:
+		case PSCI_0_2_FN64_CPU_SUSPEND:
+		case PSCI_0_2_FN_CPU_OFF:
+		case PSCI_0_2_FN_CPU_ON:
+		case PSCI_0_2_FN64_CPU_ON:
+		case PSCI_0_2_FN_AFFINITY_INFO:
+		case PSCI_0_2_FN64_AFFINITY_INFO:
+		case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+		case PSCI_0_2_FN_SYSTEM_OFF:
+		case PSCI_0_2_FN_SYSTEM_RESET:
+		case PSCI_1_0_FN_PSCI_FEATURES:
+		case ARM_SMCCC_VERSION_FUNC_ID:
+			val = 0;
+			break;
+		case PSCI_1_0_FN_SYSTEM_SUSPEND:
+		case PSCI_1_0_FN64_SYSTEM_SUSPEND:
+			if (test_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags))
+				val = 0;
+			break;
+		case PSCI_1_1_FN_SYSTEM_RESET2:
+		case PSCI_1_1_FN64_SYSTEM_RESET2:
+			if (minor >= 1)
+				val = 0;
+			break;
+		}
+		break;
+	case PSCI_1_0_FN_SYSTEM_SUSPEND:
+		kvm_psci_narrow_to_32bit(vcpu);
+		fallthrough;
+	case PSCI_1_0_FN64_SYSTEM_SUSPEND:
+		/*
+		 * Return directly to userspace without changing the vCPU's
+		 * registers. Userspace depends on reading the SMCCC parameters
+		 * to implement SYSTEM_SUSPEND.
+		 */
+		if (test_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags)) {
+			kvm_psci_system_suspend(vcpu);
+			return 0;
+		}
+		break;
+	case PSCI_1_1_FN_SYSTEM_RESET2:
+		kvm_psci_narrow_to_32bit(vcpu);
+		fallthrough;
+	case PSCI_1_1_FN64_SYSTEM_RESET2:
+		if (minor >= 1) {
+			arg = smccc_get_arg1(vcpu);
+
+			if (arg <= PSCI_1_1_RESET_TYPE_SYSTEM_WARM_RESET ||
+			    arg >= PSCI_1_1_RESET_TYPE_VENDOR_START) {
+				kvm_psci_system_reset2(vcpu);
+				vcpu_set_reg(vcpu, 0, PSCI_RET_INTERNAL_FAILURE);
+				return 0;
+			}
+
+			val = PSCI_RET_INVALID_PARAMS;
+			break;
+		}
+		break;
+	default:
+		return kvm_psci_0_2_call(vcpu);
+	}
+
+	smccc_set_retval(vcpu, val, 0, 0, 0);
+	return ret;
+}
+
+static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
+{
+	u32 psci_fn = smccc_get_function(vcpu);
+	unsigned long val;
+
+	switch (psci_fn) {
+	case KVM_PSCI_FN_CPU_OFF:
+		kvm_arm_vcpu_power_off(vcpu);
+		val = PSCI_RET_SUCCESS;
+		break;
+	case KVM_PSCI_FN_CPU_ON:
+		val = kvm_psci_vcpu_on(vcpu);
+		break;
+	default:
+		val = PSCI_RET_NOT_SUPPORTED;
+		break;
+	}
+
+	smccc_set_retval(vcpu, val, 0, 0, 0);
+	return 1;
+}
+
+/**
+ * kvm_psci_call - handle PSCI call if r0 value is in range
+ * @vcpu: Pointer to the VCPU struct
+ *
+ * Handle PSCI calls from guests through traps from HVC instructions.
+ * The calling convention is similar to SMC calls to the secure world
+ * where the function number is placed in r0.
+ *
+ * This function returns: > 0 (success), 0 (success but exit to user
+ * space), and < 0 (errors)
+ *
+ * Errors:
+ * -EINVAL: Unrecognized PSCI function
+ */
+int kvm_psci_call(struct kvm_vcpu *vcpu)
+{
+	u32 psci_fn = smccc_get_function(vcpu);
+	unsigned long val;
+
+	val = kvm_psci_check_allowed_function(vcpu, psci_fn);
+	if (val) {
+		smccc_set_retval(vcpu, val, 0, 0, 0);
+		return 1;
+	}
+
+	switch (kvm_psci_version(vcpu)) {
+	case KVM_ARM_PSCI_1_1:
+		return kvm_psci_1_x_call(vcpu, 1);
+	case KVM_ARM_PSCI_1_0:
+		return kvm_psci_1_x_call(vcpu, 0);
+	case KVM_ARM_PSCI_0_2:
+		return kvm_psci_0_2_call(vcpu);
+	case KVM_ARM_PSCI_0_1:
+		return kvm_psci_0_1_call(vcpu);
+	default:
+		return -EINVAL;
+	}
+}
diff --git a/arch/arm64/kvm/pvtime.c b/arch/arm64/kvm/pvtime.c
new file mode 100644
index 000000000..78a09f7a6
--- /dev/null
+++ b/arch/arm64/kvm/pvtime.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Arm Ltd.
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+#include <linux/sched/stat.h>
+
+#include <asm/kvm_mmu.h>
+#include <asm/pvclock-abi.h>
+
+#include <kvm/arm_hypercalls.h>
+
+void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	u64 base = vcpu->arch.steal.base;
+	u64 last_steal = vcpu->arch.steal.last_steal;
+	u64 offset = offsetof(struct pvclock_vcpu_stolen_time, stolen_time);
+	u64 steal = 0;
+	int idx;
+
+	if (base == GPA_INVALID)
+		return;
+
+	idx = srcu_read_lock(&kvm->srcu);
+	if (!kvm_get_guest(kvm, base + offset, steal)) {
+		steal = le64_to_cpu(steal);
+		vcpu->arch.steal.last_steal = READ_ONCE(current->sched_info.run_delay);
+		steal += vcpu->arch.steal.last_steal - last_steal;
+		kvm_put_guest(kvm, base + offset, cpu_to_le64(steal));
+	}
+	srcu_read_unlock(&kvm->srcu, idx);
+}
+
+long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
+{
+	u32 feature = smccc_get_arg1(vcpu);
+	long val = SMCCC_RET_NOT_SUPPORTED;
+
+	switch (feature) {
+	case ARM_SMCCC_HV_PV_TIME_FEATURES:
+	case ARM_SMCCC_HV_PV_TIME_ST:
+		if (vcpu->arch.steal.base != GPA_INVALID)
+			val = SMCCC_RET_SUCCESS;
+		break;
+	}
+
+	return val;
+}
+
+gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
+{
+	struct pvclock_vcpu_stolen_time init_values = {};
+	struct kvm *kvm = vcpu->kvm;
+	u64 base = vcpu->arch.steal.base;
+
+	if (base == GPA_INVALID)
+		return base;
+
+	/*
+	 * Start counting stolen time from the time the guest requests
+	 * the feature enabled.
+	 */
+	vcpu->arch.steal.last_steal = current->sched_info.run_delay;
+	kvm_write_guest_lock(kvm, base, &init_values, sizeof(init_values));
+
+	return base;
+}
+
+bool kvm_arm_pvtime_supported(void)
+{
+	return !!sched_info_on();
+}
+
+int kvm_arm_pvtime_set_attr(struct kvm_vcpu *vcpu,
+			    struct kvm_device_attr *attr)
+{
+	u64 __user *user = (u64 __user *)attr->addr;
+	struct kvm *kvm = vcpu->kvm;
+	u64 ipa;
+	int ret = 0;
+	int idx;
+
+	if (!kvm_arm_pvtime_supported() ||
+	    attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
+		return -ENXIO;
+
+	if (get_user(ipa, user))
+		return -EFAULT;
+	if (!IS_ALIGNED(ipa, 64))
+		return -EINVAL;
+	if (vcpu->arch.steal.base != GPA_INVALID)
+		return -EEXIST;
+
+	/* Check the address is in a valid memslot */
+	idx = srcu_read_lock(&kvm->srcu);
+	if (kvm_is_error_hva(gfn_to_hva(kvm, ipa >> PAGE_SHIFT)))
+		ret = -EINVAL;
+	srcu_read_unlock(&kvm->srcu, idx);
+
+	if (!ret)
+		vcpu->arch.steal.base = ipa;
+
+	return ret;
+}
+
+int kvm_arm_pvtime_get_attr(struct kvm_vcpu *vcpu,
+			    struct kvm_device_attr *attr)
+{
+	u64 __user *user = (u64 __user *)attr->addr;
+	u64 ipa;
+
+	if (!kvm_arm_pvtime_supported() ||
+	    attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
+		return -ENXIO;
+
+	ipa = vcpu->arch.steal.base;
+
+	if (put_user(ipa, user))
+		return -EFAULT;
+	return 0;
+}
+
+int kvm_arm_pvtime_has_attr(struct kvm_vcpu *vcpu,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->attr) {
+	case KVM_ARM_VCPU_PVTIME_IPA:
+		if (kvm_arm_pvtime_supported())
+			return 0;
+	}
+	return -ENXIO;
+}
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
new file mode 100644
index 000000000..f9d070473
--- /dev/null
+++ b/arch/arm64/kvm/reset.c
@@ -0,0 +1,427 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/reset.c
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/kvm_host.h>
+#include <linux/kvm.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <kvm/arm_arch_timer.h>
+
+#include <asm/cpufeature.h>
+#include <asm/cputype.h>
+#include <asm/fpsimd.h>
+#include <asm/ptrace.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_mmu.h>
+#include <asm/virt.h>
+
+/* Maximum phys_shift supported for any VM on this host */
+static u32 kvm_ipa_limit;
+
+/*
+ * ARMv8 Reset Values
+ */
+#define VCPU_RESET_PSTATE_EL1	(PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT | \
+				 PSR_F_BIT | PSR_D_BIT)
+
+#define VCPU_RESET_PSTATE_SVC	(PSR_AA32_MODE_SVC | PSR_AA32_A_BIT | \
+				 PSR_AA32_I_BIT | PSR_AA32_F_BIT)
+
+unsigned int kvm_sve_max_vl;
+
+int kvm_arm_init_sve(void)
+{
+	if (system_supports_sve()) {
+		kvm_sve_max_vl = sve_max_virtualisable_vl();
+
+		/*
+		 * The get_sve_reg()/set_sve_reg() ioctl interface will need
+		 * to be extended with multiple register slice support in
+		 * order to support vector lengths greater than
+		 * VL_ARCH_MAX:
+		 */
+		if (WARN_ON(kvm_sve_max_vl > VL_ARCH_MAX))
+			kvm_sve_max_vl = VL_ARCH_MAX;
+
+		/*
+		 * Don't even try to make use of vector lengths that
+		 * aren't available on all CPUs, for now:
+		 */
+		if (kvm_sve_max_vl < sve_max_vl())
+			pr_warn("KVM: SVE vector length for guests limited to %u bytes\n",
+				kvm_sve_max_vl);
+	}
+
+	return 0;
+}
+
+static int kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu)
+{
+	if (!system_supports_sve())
+		return -EINVAL;
+
+	vcpu->arch.sve_max_vl = kvm_sve_max_vl;
+
+	/*
+	 * Userspace can still customize the vector lengths by writing
+	 * KVM_REG_ARM64_SVE_VLS.  Allocation is deferred until
+	 * kvm_arm_vcpu_finalize(), which freezes the configuration.
+	 */
+	vcpu_set_flag(vcpu, GUEST_HAS_SVE);
+
+	return 0;
+}
+
+/*
+ * Finalize vcpu's maximum SVE vector length, allocating
+ * vcpu->arch.sve_state as necessary.
+ */
+static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu)
+{
+	void *buf;
+	unsigned int vl;
+	size_t reg_sz;
+	int ret;
+
+	vl = vcpu->arch.sve_max_vl;
+
+	/*
+	 * Responsibility for these properties is shared between
+	 * kvm_arm_init_sve(), kvm_vcpu_enable_sve() and
+	 * set_sve_vls().  Double-check here just to be sure:
+	 */
+	if (WARN_ON(!sve_vl_valid(vl) || vl > sve_max_virtualisable_vl() ||
+		    vl > VL_ARCH_MAX))
+		return -EIO;
+
+	reg_sz = vcpu_sve_state_size(vcpu);
+	buf = kzalloc(reg_sz, GFP_KERNEL_ACCOUNT);
+	if (!buf)
+		return -ENOMEM;
+
+	ret = kvm_share_hyp(buf, buf + reg_sz);
+	if (ret) {
+		kfree(buf);
+		return ret;
+	}
+	
+	vcpu->arch.sve_state = buf;
+	vcpu_set_flag(vcpu, VCPU_SVE_FINALIZED);
+	return 0;
+}
+
+int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
+{
+	switch (feature) {
+	case KVM_ARM_VCPU_SVE:
+		if (!vcpu_has_sve(vcpu))
+			return -EINVAL;
+
+		if (kvm_arm_vcpu_sve_finalized(vcpu))
+			return -EPERM;
+
+		return kvm_vcpu_finalize_sve(vcpu);
+	}
+
+	return -EINVAL;
+}
+
+bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_has_sve(vcpu) && !kvm_arm_vcpu_sve_finalized(vcpu))
+		return false;
+
+	return true;
+}
+
+void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	void *sve_state = vcpu->arch.sve_state;
+
+	kvm_vcpu_unshare_task_fp(vcpu);
+	kvm_unshare_hyp(vcpu, vcpu + 1);
+	if (sve_state)
+		kvm_unshare_hyp(sve_state, sve_state + vcpu_sve_state_size(vcpu));
+	kfree(sve_state);
+}
+
+static void kvm_vcpu_reset_sve(struct kvm_vcpu *vcpu)
+{
+	if (vcpu_has_sve(vcpu))
+		memset(vcpu->arch.sve_state, 0, vcpu_sve_state_size(vcpu));
+}
+
+static int kvm_vcpu_enable_ptrauth(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * For now make sure that both address/generic pointer authentication
+	 * features are requested by the userspace together and the system
+	 * supports these capabilities.
+	 */
+	if (!test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||
+	    !test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features) ||
+	    !system_has_full_ptr_auth())
+		return -EINVAL;
+
+	vcpu_set_flag(vcpu, GUEST_HAS_PTRAUTH);
+	return 0;
+}
+
+/**
+ * kvm_set_vm_width() - set the register width for the guest
+ * @vcpu: Pointer to the vcpu being configured
+ *
+ * Set both KVM_ARCH_FLAG_EL1_32BIT and KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED
+ * in the VM flags based on the vcpu's requested register width, the HW
+ * capabilities and other options (such as MTE).
+ * When REG_WIDTH_CONFIGURED is already set, the vcpu settings must be
+ * consistent with the value of the FLAG_EL1_32BIT bit in the flags.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+static int kvm_set_vm_width(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	bool is32bit;
+
+	is32bit = vcpu_has_feature(vcpu, KVM_ARM_VCPU_EL1_32BIT);
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+
+	if (test_bit(KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED, &kvm->arch.flags)) {
+		/*
+		 * The guest's register width is already configured.
+		 * Make sure that the vcpu is consistent with it.
+		 */
+		if (is32bit == test_bit(KVM_ARCH_FLAG_EL1_32BIT, &kvm->arch.flags))
+			return 0;
+
+		return -EINVAL;
+	}
+
+	if (!cpus_have_const_cap(ARM64_HAS_32BIT_EL1) && is32bit)
+		return -EINVAL;
+
+	/* MTE is incompatible with AArch32 */
+	if (kvm_has_mte(kvm) && is32bit)
+		return -EINVAL;
+
+	if (is32bit)
+		set_bit(KVM_ARCH_FLAG_EL1_32BIT, &kvm->arch.flags);
+
+	set_bit(KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED, &kvm->arch.flags);
+
+	return 0;
+}
+
+/**
+ * kvm_reset_vcpu - sets core registers and sys_regs to reset value
+ * @vcpu: The VCPU pointer
+ *
+ * This function sets the registers on the virtual CPU struct to their
+ * architecturally defined reset values, except for registers whose reset is
+ * deferred until kvm_arm_vcpu_finalize().
+ *
+ * Note: This function can be called from two paths: The KVM_ARM_VCPU_INIT
+ * ioctl or as part of handling a request issued by another VCPU in the PSCI
+ * handling code.  In the first case, the VCPU will not be loaded, and in the
+ * second case the VCPU will be loaded.  Because this function operates purely
+ * on the memory-backed values of system registers, we want to do a full put if
+ * we were loaded (handling a request) and load the values back at the end of
+ * the function.  Otherwise we leave the state alone.  In both cases, we
+ * disable preemption around the vcpu reset as we would otherwise race with
+ * preempt notifiers which also call put/load.
+ */
+int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_reset_state reset_state;
+	int ret;
+	bool loaded;
+	u32 pstate;
+
+	mutex_lock(&vcpu->kvm->arch.config_lock);
+	ret = kvm_set_vm_width(vcpu);
+	mutex_unlock(&vcpu->kvm->arch.config_lock);
+
+	if (ret)
+		return ret;
+
+	spin_lock(&vcpu->arch.mp_state_lock);
+	reset_state = vcpu->arch.reset_state;
+	vcpu->arch.reset_state.reset = false;
+	spin_unlock(&vcpu->arch.mp_state_lock);
+
+	/* Reset PMU outside of the non-preemptible section */
+	kvm_pmu_vcpu_reset(vcpu);
+
+	preempt_disable();
+	loaded = (vcpu->cpu != -1);
+	if (loaded)
+		kvm_arch_vcpu_put(vcpu);
+
+	if (!kvm_arm_vcpu_sve_finalized(vcpu)) {
+		if (test_bit(KVM_ARM_VCPU_SVE, vcpu->arch.features)) {
+			ret = kvm_vcpu_enable_sve(vcpu);
+			if (ret)
+				goto out;
+		}
+	} else {
+		kvm_vcpu_reset_sve(vcpu);
+	}
+
+	if (test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||
+	    test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features)) {
+		if (kvm_vcpu_enable_ptrauth(vcpu)) {
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+
+	switch (vcpu->arch.target) {
+	default:
+		if (vcpu_el1_is_32bit(vcpu)) {
+			pstate = VCPU_RESET_PSTATE_SVC;
+		} else {
+			pstate = VCPU_RESET_PSTATE_EL1;
+		}
+
+		if (kvm_vcpu_has_pmu(vcpu) && !kvm_arm_support_pmu_v3()) {
+			ret = -EINVAL;
+			goto out;
+		}
+		break;
+	}
+
+	/* Reset core registers */
+	memset(vcpu_gp_regs(vcpu), 0, sizeof(*vcpu_gp_regs(vcpu)));
+	memset(&vcpu->arch.ctxt.fp_regs, 0, sizeof(vcpu->arch.ctxt.fp_regs));
+	vcpu->arch.ctxt.spsr_abt = 0;
+	vcpu->arch.ctxt.spsr_und = 0;
+	vcpu->arch.ctxt.spsr_irq = 0;
+	vcpu->arch.ctxt.spsr_fiq = 0;
+	vcpu_gp_regs(vcpu)->pstate = pstate;
+
+	/* Reset system registers */
+	kvm_reset_sys_regs(vcpu);
+
+	/*
+	 * Additional reset state handling that PSCI may have imposed on us.
+	 * Must be done after all the sys_reg reset.
+	 */
+	if (reset_state.reset) {
+		unsigned long target_pc = reset_state.pc;
+
+		/* Gracefully handle Thumb2 entry point */
+		if (vcpu_mode_is_32bit(vcpu) && (target_pc & 1)) {
+			target_pc &= ~1UL;
+			vcpu_set_thumb(vcpu);
+		}
+
+		/* Propagate caller endianness */
+		if (reset_state.be)
+			kvm_vcpu_set_be(vcpu);
+
+		*vcpu_pc(vcpu) = target_pc;
+		vcpu_set_reg(vcpu, 0, reset_state.r0);
+	}
+
+	/* Reset timer */
+	ret = kvm_timer_vcpu_reset(vcpu);
+out:
+	if (loaded)
+		kvm_arch_vcpu_load(vcpu, smp_processor_id());
+	preempt_enable();
+	return ret;
+}
+
+u32 get_kvm_ipa_limit(void)
+{
+	return kvm_ipa_limit;
+}
+
+int kvm_set_ipa_limit(void)
+{
+	unsigned int parange;
+	u64 mmfr0;
+
+	mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	parange = cpuid_feature_extract_unsigned_field(mmfr0,
+				ID_AA64MMFR0_EL1_PARANGE_SHIFT);
+	/*
+	 * IPA size beyond 48 bits could not be supported
+	 * on either 4K or 16K page size. Hence let's cap
+	 * it to 48 bits, in case it's reported as larger
+	 * on the system.
+	 */
+	if (PAGE_SIZE != SZ_64K)
+		parange = min(parange, (unsigned int)ID_AA64MMFR0_EL1_PARANGE_48);
+
+	/*
+	 * Check with ARMv8.5-GTG that our PAGE_SIZE is supported at
+	 * Stage-2. If not, things will stop very quickly.
+	 */
+	switch (cpuid_feature_extract_unsigned_field(mmfr0, ID_AA64MMFR0_EL1_TGRAN_2_SHIFT)) {
+	case ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_NONE:
+		kvm_err("PAGE_SIZE not supported at Stage-2, giving up\n");
+		return -EINVAL;
+	case ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_DEFAULT:
+		kvm_debug("PAGE_SIZE supported at Stage-2 (default)\n");
+		break;
+	case ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_MIN ... ID_AA64MMFR0_EL1_TGRAN_2_SUPPORTED_MAX:
+		kvm_debug("PAGE_SIZE supported at Stage-2 (advertised)\n");
+		break;
+	default:
+		kvm_err("Unsupported value for TGRAN_2, giving up\n");
+		return -EINVAL;
+	}
+
+	kvm_ipa_limit = id_aa64mmfr0_parange_to_phys_shift(parange);
+	kvm_info("IPA Size Limit: %d bits%s\n", kvm_ipa_limit,
+		 ((kvm_ipa_limit < KVM_PHYS_SHIFT) ?
+		  " (Reduced IPA size, limited VM/VMM compatibility)" : ""));
+
+	return 0;
+}
+
+int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
+{
+	u64 mmfr0, mmfr1;
+	u32 phys_shift;
+
+	if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK)
+		return -EINVAL;
+
+	phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type);
+	if (phys_shift) {
+		if (phys_shift > kvm_ipa_limit ||
+		    phys_shift < ARM64_MIN_PARANGE_BITS)
+			return -EINVAL;
+	} else {
+		phys_shift = KVM_PHYS_SHIFT;
+		if (phys_shift > kvm_ipa_limit) {
+			pr_warn_once("%s using unsupported default IPA limit, upgrade your VMM\n",
+				     current->comm);
+			return -EINVAL;
+		}
+	}
+
+	mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+	mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
+	kvm->arch.vtcr = kvm_get_vtcr(mmfr0, mmfr1, phys_shift);
+
+	return 0;
+}
diff --git a/arch/arm64/kvm/stacktrace.c b/arch/arm64/kvm/stacktrace.c
new file mode 100644
index 000000000..3ace5b758
--- /dev/null
+++ b/arch/arm64/kvm/stacktrace.c
@@ -0,0 +1,245 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * KVM nVHE hypervisor stack tracing support.
+ *
+ * The unwinder implementation depends on the nVHE mode:
+ *
+ *   1) Non-protected nVHE mode - the host can directly access the
+ *      HYP stack pages and unwind the HYP stack in EL1. This saves having
+ *      to allocate shared buffers for the host to read the unwinded
+ *      stacktrace.
+ *
+ *   2) pKVM (protected nVHE) mode - the host cannot directly access
+ *      the HYP memory. The stack is unwinded in EL2 and dumped to a shared
+ *      buffer where the host can read and print the stacktrace.
+ *
+ * Copyright (C) 2022 Google LLC
+ */
+
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+
+#include <asm/stacktrace/nvhe.h>
+
+static struct stack_info stackinfo_get_overflow(void)
+{
+	struct kvm_nvhe_stacktrace_info *stacktrace_info
+				= this_cpu_ptr_nvhe_sym(kvm_stacktrace_info);
+	unsigned long low = (unsigned long)stacktrace_info->overflow_stack_base;
+	unsigned long high = low + OVERFLOW_STACK_SIZE;
+
+	return (struct stack_info) {
+		.low = low,
+		.high = high,
+	};
+}
+
+static struct stack_info stackinfo_get_overflow_kern_va(void)
+{
+	unsigned long low = (unsigned long)this_cpu_ptr_nvhe_sym(overflow_stack);
+	unsigned long high = low + OVERFLOW_STACK_SIZE;
+
+	return (struct stack_info) {
+		.low = low,
+		.high = high,
+	};
+}
+
+static struct stack_info stackinfo_get_hyp(void)
+{
+	struct kvm_nvhe_stacktrace_info *stacktrace_info
+				= this_cpu_ptr_nvhe_sym(kvm_stacktrace_info);
+	unsigned long low = (unsigned long)stacktrace_info->stack_base;
+	unsigned long high = low + PAGE_SIZE;
+
+	return (struct stack_info) {
+		.low = low,
+		.high = high,
+	};
+}
+
+static struct stack_info stackinfo_get_hyp_kern_va(void)
+{
+	unsigned long low = (unsigned long)*this_cpu_ptr(&kvm_arm_hyp_stack_page);
+	unsigned long high = low + PAGE_SIZE;
+
+	return (struct stack_info) {
+		.low = low,
+		.high = high,
+	};
+}
+
+/*
+ * kvm_nvhe_stack_kern_va - Convert KVM nVHE HYP stack addresses to a kernel VAs
+ *
+ * The nVHE hypervisor stack is mapped in the flexible 'private' VA range, to
+ * allow for guard pages below the stack. Consequently, the fixed offset address
+ * translation macros won't work here.
+ *
+ * The kernel VA is calculated as an offset from the kernel VA of the hypervisor
+ * stack base.
+ *
+ * Returns true on success and updates @addr to its corresponding kernel VA;
+ * otherwise returns false.
+ */
+static bool kvm_nvhe_stack_kern_va(unsigned long *addr, unsigned long size)
+{
+	struct stack_info stack_hyp, stack_kern;
+
+	stack_hyp = stackinfo_get_hyp();
+	stack_kern = stackinfo_get_hyp_kern_va();
+	if (stackinfo_on_stack(&stack_hyp, *addr, size))
+		goto found;
+
+	stack_hyp = stackinfo_get_overflow();
+	stack_kern = stackinfo_get_overflow_kern_va();
+	if (stackinfo_on_stack(&stack_hyp, *addr, size))
+		goto found;
+
+	return false;
+
+found:
+	*addr = *addr - stack_hyp.low + stack_kern.low;
+	return true;
+}
+
+/*
+ * Convert a KVN nVHE HYP frame record address to a kernel VA
+ */
+static bool kvm_nvhe_stack_kern_record_va(unsigned long *addr)
+{
+	return kvm_nvhe_stack_kern_va(addr, 16);
+}
+
+static int unwind_next(struct unwind_state *state)
+{
+	/*
+	 * The FP is in the hypervisor VA space. Convert it to the kernel VA
+	 * space so it can be unwound by the regular unwind functions.
+	 */
+	if (!kvm_nvhe_stack_kern_record_va(&state->fp))
+		return -EINVAL;
+
+	return unwind_next_frame_record(state);
+}
+
+static void unwind(struct unwind_state *state,
+		   stack_trace_consume_fn consume_entry, void *cookie)
+{
+	while (1) {
+		int ret;
+
+		if (!consume_entry(cookie, state->pc))
+			break;
+		ret = unwind_next(state);
+		if (ret < 0)
+			break;
+	}
+}
+
+/*
+ * kvm_nvhe_dump_backtrace_entry - Symbolize and print an nVHE backtrace entry
+ *
+ * @arg    : the hypervisor offset, used for address translation
+ * @where  : the program counter corresponding to the stack frame
+ */
+static bool kvm_nvhe_dump_backtrace_entry(void *arg, unsigned long where)
+{
+	unsigned long va_mask = GENMASK_ULL(vabits_actual - 1, 0);
+	unsigned long hyp_offset = (unsigned long)arg;
+
+	/* Mask tags and convert to kern addr */
+	where = (where & va_mask) + hyp_offset;
+	kvm_err(" [<%016lx>] %pB\n", where, (void *)(where + kaslr_offset()));
+
+	return true;
+}
+
+static void kvm_nvhe_dump_backtrace_start(void)
+{
+	kvm_err("nVHE call trace:\n");
+}
+
+static void kvm_nvhe_dump_backtrace_end(void)
+{
+	kvm_err("---[ end nVHE call trace ]---\n");
+}
+
+/*
+ * hyp_dump_backtrace - Dump the non-protected nVHE backtrace.
+ *
+ * @hyp_offset: hypervisor offset, used for address translation.
+ *
+ * The host can directly access HYP stack pages in non-protected
+ * mode, so the unwinding is done directly from EL1. This removes
+ * the need for shared buffers between host and hypervisor for
+ * the stacktrace.
+ */
+static void hyp_dump_backtrace(unsigned long hyp_offset)
+{
+	struct kvm_nvhe_stacktrace_info *stacktrace_info;
+	struct stack_info stacks[] = {
+		stackinfo_get_overflow_kern_va(),
+		stackinfo_get_hyp_kern_va(),
+	};
+	struct unwind_state state = {
+		.stacks = stacks,
+		.nr_stacks = ARRAY_SIZE(stacks),
+	};
+
+	stacktrace_info = this_cpu_ptr_nvhe_sym(kvm_stacktrace_info);
+
+	kvm_nvhe_unwind_init(&state, stacktrace_info->fp, stacktrace_info->pc);
+
+	kvm_nvhe_dump_backtrace_start();
+	unwind(&state, kvm_nvhe_dump_backtrace_entry, (void *)hyp_offset);
+	kvm_nvhe_dump_backtrace_end();
+}
+
+#ifdef CONFIG_PROTECTED_NVHE_STACKTRACE
+DECLARE_KVM_NVHE_PER_CPU(unsigned long [NVHE_STACKTRACE_SIZE/sizeof(long)],
+			 pkvm_stacktrace);
+
+/*
+ * pkvm_dump_backtrace - Dump the protected nVHE HYP backtrace.
+ *
+ * @hyp_offset: hypervisor offset, used for address translation.
+ *
+ * Dumping of the pKVM HYP backtrace is done by reading the
+ * stack addresses from the shared stacktrace buffer, since the
+ * host cannot directly access hypervisor memory in protected
+ * mode.
+ */
+static void pkvm_dump_backtrace(unsigned long hyp_offset)
+{
+	unsigned long *stacktrace
+		= (unsigned long *) this_cpu_ptr_nvhe_sym(pkvm_stacktrace);
+	int i;
+
+	kvm_nvhe_dump_backtrace_start();
+	/* The saved stacktrace is terminated by a null entry */
+	for (i = 0;
+	     i < ARRAY_SIZE(kvm_nvhe_sym(pkvm_stacktrace)) && stacktrace[i];
+	     i++)
+		kvm_nvhe_dump_backtrace_entry((void *)hyp_offset, stacktrace[i]);
+	kvm_nvhe_dump_backtrace_end();
+}
+#else	/* !CONFIG_PROTECTED_NVHE_STACKTRACE */
+static void pkvm_dump_backtrace(unsigned long hyp_offset)
+{
+	kvm_err("Cannot dump pKVM nVHE stacktrace: !CONFIG_PROTECTED_NVHE_STACKTRACE\n");
+}
+#endif /* CONFIG_PROTECTED_NVHE_STACKTRACE */
+
+/*
+ * kvm_nvhe_dump_backtrace - Dump KVM nVHE hypervisor backtrace.
+ *
+ * @hyp_offset: hypervisor offset, used for address translation.
+ */
+void kvm_nvhe_dump_backtrace(unsigned long hyp_offset)
+{
+	if (is_protected_kvm_enabled())
+		pkvm_dump_backtrace(hyp_offset);
+	else
+		hyp_dump_backtrace(hyp_offset);
+}
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
new file mode 100644
index 000000000..457e74f1f
--- /dev/null
+++ b/arch/arm64/kvm/sys_regs.c
@@ -0,0 +1,3005 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/coproc.c:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Authors: Rusty Russell <rusty@rustcorp.com.au>
+ *          Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bsearch.h>
+#include <linux/kvm_host.h>
+#include <linux/mm.h>
+#include <linux/printk.h>
+#include <linux/uaccess.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cputype.h>
+#include <asm/debug-monitors.h>
+#include <asm/esr.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/perf_event.h>
+#include <asm/sysreg.h>
+
+#include <trace/events/kvm.h>
+
+#include "sys_regs.h"
+
+#include "trace.h"
+
+/*
+ * For AArch32, we only take care of what is being trapped. Anything
+ * that has to do with init and userspace access has to go via the
+ * 64bit interface.
+ */
+
+static u64 sys_reg_to_index(const struct sys_reg_desc *reg);
+
+static bool read_from_write_only(struct kvm_vcpu *vcpu,
+				 struct sys_reg_params *params,
+				 const struct sys_reg_desc *r)
+{
+	WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n");
+	print_sys_reg_instr(params);
+	kvm_inject_undefined(vcpu);
+	return false;
+}
+
+static bool write_to_read_only(struct kvm_vcpu *vcpu,
+			       struct sys_reg_params *params,
+			       const struct sys_reg_desc *r)
+{
+	WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n");
+	print_sys_reg_instr(params);
+	kvm_inject_undefined(vcpu);
+	return false;
+}
+
+u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg)
+{
+	u64 val = 0x8badf00d8badf00d;
+
+	if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) &&
+	    __vcpu_read_sys_reg_from_cpu(reg, &val))
+		return val;
+
+	return __vcpu_sys_reg(vcpu, reg);
+}
+
+void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg)
+{
+	if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) &&
+	    __vcpu_write_sys_reg_to_cpu(val, reg))
+		return;
+
+	 __vcpu_sys_reg(vcpu, reg) = val;
+}
+
+/* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */
+static u32 cache_levels;
+
+/* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */
+#define CSSELR_MAX 14
+
+/* Which cache CCSIDR represents depends on CSSELR value. */
+static u32 get_ccsidr(u32 csselr)
+{
+	u32 ccsidr;
+
+	/* Make sure noone else changes CSSELR during this! */
+	local_irq_disable();
+	write_sysreg(csselr, csselr_el1);
+	isb();
+	ccsidr = read_sysreg(ccsidr_el1);
+	local_irq_enable();
+
+	return ccsidr;
+}
+
+/*
+ * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized).
+ */
+static bool access_dcsw(struct kvm_vcpu *vcpu,
+			struct sys_reg_params *p,
+			const struct sys_reg_desc *r)
+{
+	if (!p->is_write)
+		return read_from_write_only(vcpu, p, r);
+
+	/*
+	 * Only track S/W ops if we don't have FWB. It still indicates
+	 * that the guest is a bit broken (S/W operations should only
+	 * be done by firmware, knowing that there is only a single
+	 * CPU left in the system, and certainly not from non-secure
+	 * software).
+	 */
+	if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
+		kvm_set_way_flush(vcpu);
+
+	return true;
+}
+
+static void get_access_mask(const struct sys_reg_desc *r, u64 *mask, u64 *shift)
+{
+	switch (r->aarch32_map) {
+	case AA32_LO:
+		*mask = GENMASK_ULL(31, 0);
+		*shift = 0;
+		break;
+	case AA32_HI:
+		*mask = GENMASK_ULL(63, 32);
+		*shift = 32;
+		break;
+	default:
+		*mask = GENMASK_ULL(63, 0);
+		*shift = 0;
+		break;
+	}
+}
+
+/*
+ * Generic accessor for VM registers. Only called as long as HCR_TVM
+ * is set. If the guest enables the MMU, we stop trapping the VM
+ * sys_regs and leave it in complete control of the caches.
+ */
+static bool access_vm_reg(struct kvm_vcpu *vcpu,
+			  struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	bool was_enabled = vcpu_has_cache_enabled(vcpu);
+	u64 val, mask, shift;
+
+	BUG_ON(!p->is_write);
+
+	get_access_mask(r, &mask, &shift);
+
+	if (~mask) {
+		val = vcpu_read_sys_reg(vcpu, r->reg);
+		val &= ~mask;
+	} else {
+		val = 0;
+	}
+
+	val |= (p->regval & (mask >> shift)) << shift;
+	vcpu_write_sys_reg(vcpu, val, r->reg);
+
+	kvm_toggle_cache(vcpu, was_enabled);
+	return true;
+}
+
+static bool access_actlr(struct kvm_vcpu *vcpu,
+			 struct sys_reg_params *p,
+			 const struct sys_reg_desc *r)
+{
+	u64 mask, shift;
+
+	if (p->is_write)
+		return ignore_write(vcpu, p);
+
+	get_access_mask(r, &mask, &shift);
+	p->regval = (vcpu_read_sys_reg(vcpu, r->reg) & mask) >> shift;
+
+	return true;
+}
+
+/*
+ * Trap handler for the GICv3 SGI generation system register.
+ * Forward the request to the VGIC emulation.
+ * The cp15_64 code makes sure this automatically works
+ * for both AArch64 and AArch32 accesses.
+ */
+static bool access_gic_sgi(struct kvm_vcpu *vcpu,
+			   struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	bool g1;
+
+	if (!p->is_write)
+		return read_from_write_only(vcpu, p, r);
+
+	/*
+	 * In a system where GICD_CTLR.DS=1, a ICC_SGI0R_EL1 access generates
+	 * Group0 SGIs only, while ICC_SGI1R_EL1 can generate either group,
+	 * depending on the SGI configuration. ICC_ASGI1R_EL1 is effectively
+	 * equivalent to ICC_SGI0R_EL1, as there is no "alternative" secure
+	 * group.
+	 */
+	if (p->Op0 == 0) {		/* AArch32 */
+		switch (p->Op1) {
+		default:		/* Keep GCC quiet */
+		case 0:			/* ICC_SGI1R */
+			g1 = true;
+			break;
+		case 1:			/* ICC_ASGI1R */
+		case 2:			/* ICC_SGI0R */
+			g1 = false;
+			break;
+		}
+	} else {			/* AArch64 */
+		switch (p->Op2) {
+		default:		/* Keep GCC quiet */
+		case 5:			/* ICC_SGI1R_EL1 */
+			g1 = true;
+			break;
+		case 6:			/* ICC_ASGI1R_EL1 */
+		case 7:			/* ICC_SGI0R_EL1 */
+			g1 = false;
+			break;
+		}
+	}
+
+	vgic_v3_dispatch_sgi(vcpu, p->regval, g1);
+
+	return true;
+}
+
+static bool access_gic_sre(struct kvm_vcpu *vcpu,
+			   struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	if (p->is_write)
+		return ignore_write(vcpu, p);
+
+	p->regval = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre;
+	return true;
+}
+
+static bool trap_raz_wi(struct kvm_vcpu *vcpu,
+			struct sys_reg_params *p,
+			const struct sys_reg_desc *r)
+{
+	if (p->is_write)
+		return ignore_write(vcpu, p);
+	else
+		return read_zero(vcpu, p);
+}
+
+/*
+ * ARMv8.1 mandates at least a trivial LORegion implementation, where all the
+ * RW registers are RES0 (which we can implement as RAZ/WI). On an ARMv8.0
+ * system, these registers should UNDEF. LORID_EL1 being a RO register, we
+ * treat it separately.
+ */
+static bool trap_loregion(struct kvm_vcpu *vcpu,
+			  struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	u64 val = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
+	u32 sr = reg_to_encoding(r);
+
+	if (!(val & (0xfUL << ID_AA64MMFR1_EL1_LO_SHIFT))) {
+		kvm_inject_undefined(vcpu);
+		return false;
+	}
+
+	if (p->is_write && sr == SYS_LORID_EL1)
+		return write_to_read_only(vcpu, p, r);
+
+	return trap_raz_wi(vcpu, p, r);
+}
+
+static bool trap_oslar_el1(struct kvm_vcpu *vcpu,
+			   struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	u64 oslsr;
+
+	if (!p->is_write)
+		return read_from_write_only(vcpu, p, r);
+
+	/* Forward the OSLK bit to OSLSR */
+	oslsr = __vcpu_sys_reg(vcpu, OSLSR_EL1) & ~SYS_OSLSR_OSLK;
+	if (p->regval & SYS_OSLAR_OSLK)
+		oslsr |= SYS_OSLSR_OSLK;
+
+	__vcpu_sys_reg(vcpu, OSLSR_EL1) = oslsr;
+	return true;
+}
+
+static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
+			   struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	if (p->is_write)
+		return write_to_read_only(vcpu, p, r);
+
+	p->regval = __vcpu_sys_reg(vcpu, r->reg);
+	return true;
+}
+
+static int set_oslsr_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+			 u64 val)
+{
+	/*
+	 * The only modifiable bit is the OSLK bit. Refuse the write if
+	 * userspace attempts to change any other bit in the register.
+	 */
+	if ((val ^ rd->val) & ~SYS_OSLSR_OSLK)
+		return -EINVAL;
+
+	__vcpu_sys_reg(vcpu, rd->reg) = val;
+	return 0;
+}
+
+static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu,
+				   struct sys_reg_params *p,
+				   const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		return ignore_write(vcpu, p);
+	} else {
+		p->regval = read_sysreg(dbgauthstatus_el1);
+		return true;
+	}
+}
+
+/*
+ * We want to avoid world-switching all the DBG registers all the
+ * time:
+ *
+ * - If we've touched any debug register, it is likely that we're
+ *   going to touch more of them. It then makes sense to disable the
+ *   traps and start doing the save/restore dance
+ * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is
+ *   then mandatory to save/restore the registers, as the guest
+ *   depends on them.
+ *
+ * For this, we use a DIRTY bit, indicating the guest has modified the
+ * debug registers, used as follow:
+ *
+ * On guest entry:
+ * - If the dirty bit is set (because we're coming back from trapping),
+ *   disable the traps, save host registers, restore guest registers.
+ * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set),
+ *   set the dirty bit, disable the traps, save host registers,
+ *   restore guest registers.
+ * - Otherwise, enable the traps
+ *
+ * On guest exit:
+ * - If the dirty bit is set, save guest registers, restore host
+ *   registers and clear the dirty bit. This ensure that the host can
+ *   now use the debug registers.
+ */
+static bool trap_debug_regs(struct kvm_vcpu *vcpu,
+			    struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		vcpu_write_sys_reg(vcpu, p->regval, r->reg);
+		vcpu_set_flag(vcpu, DEBUG_DIRTY);
+	} else {
+		p->regval = vcpu_read_sys_reg(vcpu, r->reg);
+	}
+
+	trace_trap_reg(__func__, r->reg, p->is_write, p->regval);
+
+	return true;
+}
+
+/*
+ * reg_to_dbg/dbg_to_reg
+ *
+ * A 32 bit write to a debug register leave top bits alone
+ * A 32 bit read from a debug register only returns the bottom bits
+ *
+ * All writes will set the DEBUG_DIRTY flag to ensure the hyp code
+ * switches between host and guest values in future.
+ */
+static void reg_to_dbg(struct kvm_vcpu *vcpu,
+		       struct sys_reg_params *p,
+		       const struct sys_reg_desc *rd,
+		       u64 *dbg_reg)
+{
+	u64 mask, shift, val;
+
+	get_access_mask(rd, &mask, &shift);
+
+	val = *dbg_reg;
+	val &= ~mask;
+	val |= (p->regval & (mask >> shift)) << shift;
+	*dbg_reg = val;
+
+	vcpu_set_flag(vcpu, DEBUG_DIRTY);
+}
+
+static void dbg_to_reg(struct kvm_vcpu *vcpu,
+		       struct sys_reg_params *p,
+		       const struct sys_reg_desc *rd,
+		       u64 *dbg_reg)
+{
+	u64 mask, shift;
+
+	get_access_mask(rd, &mask, &shift);
+	p->regval = (*dbg_reg & mask) >> shift;
+}
+
+static bool trap_bvr(struct kvm_vcpu *vcpu,
+		     struct sys_reg_params *p,
+		     const struct sys_reg_desc *rd)
+{
+	u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm];
+
+	if (p->is_write)
+		reg_to_dbg(vcpu, p, rd, dbg_reg);
+	else
+		dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+	trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg);
+
+	return true;
+}
+
+static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 val)
+{
+	vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = val;
+	return 0;
+}
+
+static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 *val)
+{
+	*val = vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm];
+	return 0;
+}
+
+static void reset_bvr(struct kvm_vcpu *vcpu,
+		      const struct sys_reg_desc *rd)
+{
+	vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = rd->val;
+}
+
+static bool trap_bcr(struct kvm_vcpu *vcpu,
+		     struct sys_reg_params *p,
+		     const struct sys_reg_desc *rd)
+{
+	u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm];
+
+	if (p->is_write)
+		reg_to_dbg(vcpu, p, rd, dbg_reg);
+	else
+		dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+	trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg);
+
+	return true;
+}
+
+static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 val)
+{
+	vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = val;
+	return 0;
+}
+
+static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 *val)
+{
+	*val = vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm];
+	return 0;
+}
+
+static void reset_bcr(struct kvm_vcpu *vcpu,
+		      const struct sys_reg_desc *rd)
+{
+	vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = rd->val;
+}
+
+static bool trap_wvr(struct kvm_vcpu *vcpu,
+		     struct sys_reg_params *p,
+		     const struct sys_reg_desc *rd)
+{
+	u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm];
+
+	if (p->is_write)
+		reg_to_dbg(vcpu, p, rd, dbg_reg);
+	else
+		dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+	trace_trap_reg(__func__, rd->CRm, p->is_write,
+		vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]);
+
+	return true;
+}
+
+static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 val)
+{
+	vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = val;
+	return 0;
+}
+
+static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 *val)
+{
+	*val = vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm];
+	return 0;
+}
+
+static void reset_wvr(struct kvm_vcpu *vcpu,
+		      const struct sys_reg_desc *rd)
+{
+	vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = rd->val;
+}
+
+static bool trap_wcr(struct kvm_vcpu *vcpu,
+		     struct sys_reg_params *p,
+		     const struct sys_reg_desc *rd)
+{
+	u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm];
+
+	if (p->is_write)
+		reg_to_dbg(vcpu, p, rd, dbg_reg);
+	else
+		dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+	trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg);
+
+	return true;
+}
+
+static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 val)
+{
+	vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = val;
+	return 0;
+}
+
+static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		   u64 *val)
+{
+	*val = vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm];
+	return 0;
+}
+
+static void reset_wcr(struct kvm_vcpu *vcpu,
+		      const struct sys_reg_desc *rd)
+{
+	vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = rd->val;
+}
+
+static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	u64 amair = read_sysreg(amair_el1);
+	vcpu_write_sys_reg(vcpu, amair, AMAIR_EL1);
+}
+
+static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	u64 actlr = read_sysreg(actlr_el1);
+	vcpu_write_sys_reg(vcpu, actlr, ACTLR_EL1);
+}
+
+static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	u64 mpidr;
+
+	/*
+	 * Map the vcpu_id into the first three affinity level fields of
+	 * the MPIDR. We limit the number of VCPUs in level 0 due to a
+	 * limitation to 16 CPUs in that level in the ICC_SGIxR registers
+	 * of the GICv3 to be able to address each CPU directly when
+	 * sending IPIs.
+	 */
+	mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0);
+	mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1);
+	mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2);
+	vcpu_write_sys_reg(vcpu, (1ULL << 31) | mpidr, MPIDR_EL1);
+}
+
+static unsigned int pmu_visibility(const struct kvm_vcpu *vcpu,
+				   const struct sys_reg_desc *r)
+{
+	if (kvm_vcpu_has_pmu(vcpu))
+		return 0;
+
+	return REG_HIDDEN;
+}
+
+static void reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	u64 n, mask = BIT(ARMV8_PMU_CYCLE_IDX);
+
+	/* No PMU available, any PMU reg may UNDEF... */
+	if (!kvm_arm_support_pmu_v3())
+		return;
+
+	n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT;
+	n &= ARMV8_PMU_PMCR_N_MASK;
+	if (n)
+		mask |= GENMASK(n - 1, 0);
+
+	reset_unknown(vcpu, r);
+	__vcpu_sys_reg(vcpu, r->reg) &= mask;
+}
+
+static void reset_pmevcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	reset_unknown(vcpu, r);
+	__vcpu_sys_reg(vcpu, r->reg) &= GENMASK(31, 0);
+}
+
+static void reset_pmevtyper(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	reset_unknown(vcpu, r);
+	__vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_EVTYPE_MASK;
+}
+
+static void reset_pmselr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	reset_unknown(vcpu, r);
+	__vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_COUNTER_MASK;
+}
+
+static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	u64 pmcr, val;
+
+	/* No PMU available, PMCR_EL0 may UNDEF... */
+	if (!kvm_arm_support_pmu_v3())
+		return;
+
+	pmcr = read_sysreg(pmcr_el0);
+	/*
+	 * Writable bits of PMCR_EL0 (ARMV8_PMU_PMCR_MASK) are reset to UNKNOWN
+	 * except PMCR.E resetting to zero.
+	 */
+	val = ((pmcr & ~ARMV8_PMU_PMCR_MASK)
+	       | (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E);
+	if (!kvm_supports_32bit_el0())
+		val |= ARMV8_PMU_PMCR_LC;
+	__vcpu_sys_reg(vcpu, r->reg) = val;
+}
+
+static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags)
+{
+	u64 reg = __vcpu_sys_reg(vcpu, PMUSERENR_EL0);
+	bool enabled = (reg & flags) || vcpu_mode_priv(vcpu);
+
+	if (!enabled)
+		kvm_inject_undefined(vcpu);
+
+	return !enabled;
+}
+
+static bool pmu_access_el0_disabled(struct kvm_vcpu *vcpu)
+{
+	return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_EN);
+}
+
+static bool pmu_write_swinc_el0_disabled(struct kvm_vcpu *vcpu)
+{
+	return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_SW | ARMV8_PMU_USERENR_EN);
+}
+
+static bool pmu_access_cycle_counter_el0_disabled(struct kvm_vcpu *vcpu)
+{
+	return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_CR | ARMV8_PMU_USERENR_EN);
+}
+
+static bool pmu_access_event_counter_el0_disabled(struct kvm_vcpu *vcpu)
+{
+	return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_EN);
+}
+
+static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			const struct sys_reg_desc *r)
+{
+	u64 val;
+
+	if (pmu_access_el0_disabled(vcpu))
+		return false;
+
+	if (p->is_write) {
+		/*
+		 * Only update writeable bits of PMCR (continuing into
+		 * kvm_pmu_handle_pmcr() as well)
+		 */
+		val = __vcpu_sys_reg(vcpu, PMCR_EL0);
+		val &= ~ARMV8_PMU_PMCR_MASK;
+		val |= p->regval & ARMV8_PMU_PMCR_MASK;
+		if (!kvm_supports_32bit_el0())
+			val |= ARMV8_PMU_PMCR_LC;
+		kvm_pmu_handle_pmcr(vcpu, val);
+	} else {
+		/* PMCR.P & PMCR.C are RAZ */
+		val = __vcpu_sys_reg(vcpu, PMCR_EL0)
+		      & ~(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C);
+		p->regval = val;
+	}
+
+	return true;
+}
+
+static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	if (pmu_access_event_counter_el0_disabled(vcpu))
+		return false;
+
+	if (p->is_write)
+		__vcpu_sys_reg(vcpu, PMSELR_EL0) = p->regval;
+	else
+		/* return PMSELR.SEL field */
+		p->regval = __vcpu_sys_reg(vcpu, PMSELR_EL0)
+			    & ARMV8_PMU_COUNTER_MASK;
+
+	return true;
+}
+
+static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	u64 pmceid, mask, shift;
+
+	BUG_ON(p->is_write);
+
+	if (pmu_access_el0_disabled(vcpu))
+		return false;
+
+	get_access_mask(r, &mask, &shift);
+
+	pmceid = kvm_pmu_get_pmceid(vcpu, (p->Op2 & 1));
+	pmceid &= mask;
+	pmceid >>= shift;
+
+	p->regval = pmceid;
+
+	return true;
+}
+
+static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx)
+{
+	u64 pmcr, val;
+
+	pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0);
+	val = (pmcr >> ARMV8_PMU_PMCR_N_SHIFT) & ARMV8_PMU_PMCR_N_MASK;
+	if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) {
+		kvm_inject_undefined(vcpu);
+		return false;
+	}
+
+	return true;
+}
+
+static int get_pmu_evcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			  u64 *val)
+{
+	u64 idx;
+
+	if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 0)
+		/* PMCCNTR_EL0 */
+		idx = ARMV8_PMU_CYCLE_IDX;
+	else
+		/* PMEVCNTRn_EL0 */
+		idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
+
+	*val = kvm_pmu_get_counter_value(vcpu, idx);
+	return 0;
+}
+
+static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
+			      struct sys_reg_params *p,
+			      const struct sys_reg_desc *r)
+{
+	u64 idx = ~0UL;
+
+	if (r->CRn == 9 && r->CRm == 13) {
+		if (r->Op2 == 2) {
+			/* PMXEVCNTR_EL0 */
+			if (pmu_access_event_counter_el0_disabled(vcpu))
+				return false;
+
+			idx = __vcpu_sys_reg(vcpu, PMSELR_EL0)
+			      & ARMV8_PMU_COUNTER_MASK;
+		} else if (r->Op2 == 0) {
+			/* PMCCNTR_EL0 */
+			if (pmu_access_cycle_counter_el0_disabled(vcpu))
+				return false;
+
+			idx = ARMV8_PMU_CYCLE_IDX;
+		}
+	} else if (r->CRn == 0 && r->CRm == 9) {
+		/* PMCCNTR */
+		if (pmu_access_event_counter_el0_disabled(vcpu))
+			return false;
+
+		idx = ARMV8_PMU_CYCLE_IDX;
+	} else if (r->CRn == 14 && (r->CRm & 12) == 8) {
+		/* PMEVCNTRn_EL0 */
+		if (pmu_access_event_counter_el0_disabled(vcpu))
+			return false;
+
+		idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
+	}
+
+	/* Catch any decoding mistake */
+	WARN_ON(idx == ~0UL);
+
+	if (!pmu_counter_idx_valid(vcpu, idx))
+		return false;
+
+	if (p->is_write) {
+		if (pmu_access_el0_disabled(vcpu))
+			return false;
+
+		kvm_pmu_set_counter_value(vcpu, idx, p->regval);
+	} else {
+		p->regval = kvm_pmu_get_counter_value(vcpu, idx);
+	}
+
+	return true;
+}
+
+static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			       const struct sys_reg_desc *r)
+{
+	u64 idx, reg;
+
+	if (pmu_access_el0_disabled(vcpu))
+		return false;
+
+	if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 1) {
+		/* PMXEVTYPER_EL0 */
+		idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_PMU_COUNTER_MASK;
+		reg = PMEVTYPER0_EL0 + idx;
+	} else if (r->CRn == 14 && (r->CRm & 12) == 12) {
+		idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
+		if (idx == ARMV8_PMU_CYCLE_IDX)
+			reg = PMCCFILTR_EL0;
+		else
+			/* PMEVTYPERn_EL0 */
+			reg = PMEVTYPER0_EL0 + idx;
+	} else {
+		BUG();
+	}
+
+	if (!pmu_counter_idx_valid(vcpu, idx))
+		return false;
+
+	if (p->is_write) {
+		kvm_pmu_set_counter_event_type(vcpu, p->regval, idx);
+		__vcpu_sys_reg(vcpu, reg) = p->regval & ARMV8_PMU_EVTYPE_MASK;
+		kvm_vcpu_pmu_restore_guest(vcpu);
+	} else {
+		p->regval = __vcpu_sys_reg(vcpu, reg) & ARMV8_PMU_EVTYPE_MASK;
+	}
+
+	return true;
+}
+
+static bool access_pmcnten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	u64 val, mask;
+
+	if (pmu_access_el0_disabled(vcpu))
+		return false;
+
+	mask = kvm_pmu_valid_counter_mask(vcpu);
+	if (p->is_write) {
+		val = p->regval & mask;
+		if (r->Op2 & 0x1) {
+			/* accessing PMCNTENSET_EL0 */
+			__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) |= val;
+			kvm_pmu_enable_counter_mask(vcpu, val);
+			kvm_vcpu_pmu_restore_guest(vcpu);
+		} else {
+			/* accessing PMCNTENCLR_EL0 */
+			__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) &= ~val;
+			kvm_pmu_disable_counter_mask(vcpu, val);
+		}
+	} else {
+		p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
+	}
+
+	return true;
+}
+
+static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	u64 mask = kvm_pmu_valid_counter_mask(vcpu);
+
+	if (check_pmu_access_disabled(vcpu, 0))
+		return false;
+
+	if (p->is_write) {
+		u64 val = p->regval & mask;
+
+		if (r->Op2 & 0x1)
+			/* accessing PMINTENSET_EL1 */
+			__vcpu_sys_reg(vcpu, PMINTENSET_EL1) |= val;
+		else
+			/* accessing PMINTENCLR_EL1 */
+			__vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= ~val;
+	} else {
+		p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1);
+	}
+
+	return true;
+}
+
+static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			 const struct sys_reg_desc *r)
+{
+	u64 mask = kvm_pmu_valid_counter_mask(vcpu);
+
+	if (pmu_access_el0_disabled(vcpu))
+		return false;
+
+	if (p->is_write) {
+		if (r->CRm & 0x2)
+			/* accessing PMOVSSET_EL0 */
+			__vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= (p->regval & mask);
+		else
+			/* accessing PMOVSCLR_EL0 */
+			__vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask);
+	} else {
+		p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0);
+	}
+
+	return true;
+}
+
+static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	u64 mask;
+
+	if (!p->is_write)
+		return read_from_write_only(vcpu, p, r);
+
+	if (pmu_write_swinc_el0_disabled(vcpu))
+		return false;
+
+	mask = kvm_pmu_valid_counter_mask(vcpu);
+	kvm_pmu_software_increment(vcpu, p->regval & mask);
+	return true;
+}
+
+static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			     const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		if (!vcpu_mode_priv(vcpu)) {
+			kvm_inject_undefined(vcpu);
+			return false;
+		}
+
+		__vcpu_sys_reg(vcpu, PMUSERENR_EL0) =
+			       p->regval & ARMV8_PMU_USERENR_MASK;
+	} else {
+		p->regval = __vcpu_sys_reg(vcpu, PMUSERENR_EL0)
+			    & ARMV8_PMU_USERENR_MASK;
+	}
+
+	return true;
+}
+
+/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
+#define DBG_BCR_BVR_WCR_WVR_EL1(n)					\
+	{ SYS_DESC(SYS_DBGBVRn_EL1(n)),					\
+	  trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr },		\
+	{ SYS_DESC(SYS_DBGBCRn_EL1(n)),					\
+	  trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr },		\
+	{ SYS_DESC(SYS_DBGWVRn_EL1(n)),					\
+	  trap_wvr, reset_wvr, 0, 0,  get_wvr, set_wvr },		\
+	{ SYS_DESC(SYS_DBGWCRn_EL1(n)),					\
+	  trap_wcr, reset_wcr, 0, 0,  get_wcr, set_wcr }
+
+#define PMU_SYS_REG(r)						\
+	SYS_DESC(r), .reset = reset_pmu_reg, .visibility = pmu_visibility
+
+/* Macro to expand the PMEVCNTRn_EL0 register */
+#define PMU_PMEVCNTR_EL0(n)						\
+	{ PMU_SYS_REG(SYS_PMEVCNTRn_EL0(n)),				\
+	  .reset = reset_pmevcntr, .get_user = get_pmu_evcntr,		\
+	  .access = access_pmu_evcntr, .reg = (PMEVCNTR0_EL0 + n), }
+
+/* Macro to expand the PMEVTYPERn_EL0 register */
+#define PMU_PMEVTYPER_EL0(n)						\
+	{ PMU_SYS_REG(SYS_PMEVTYPERn_EL0(n)),				\
+	  .reset = reset_pmevtyper,					\
+	  .access = access_pmu_evtyper, .reg = (PMEVTYPER0_EL0 + n), }
+
+static bool undef_access(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			 const struct sys_reg_desc *r)
+{
+	kvm_inject_undefined(vcpu);
+
+	return false;
+}
+
+/* Macro to expand the AMU counter and type registers*/
+#define AMU_AMEVCNTR0_EL0(n) { SYS_DESC(SYS_AMEVCNTR0_EL0(n)), undef_access }
+#define AMU_AMEVTYPER0_EL0(n) { SYS_DESC(SYS_AMEVTYPER0_EL0(n)), undef_access }
+#define AMU_AMEVCNTR1_EL0(n) { SYS_DESC(SYS_AMEVCNTR1_EL0(n)), undef_access }
+#define AMU_AMEVTYPER1_EL0(n) { SYS_DESC(SYS_AMEVTYPER1_EL0(n)), undef_access }
+
+static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu,
+			const struct sys_reg_desc *rd)
+{
+	return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN;
+}
+
+/*
+ * If we land here on a PtrAuth access, that is because we didn't
+ * fixup the access on exit by allowing the PtrAuth sysregs. The only
+ * way this happens is when the guest does not have PtrAuth support
+ * enabled.
+ */
+#define __PTRAUTH_KEY(k)						\
+	{ SYS_DESC(SYS_## k), undef_access, reset_unknown, k,		\
+	.visibility = ptrauth_visibility}
+
+#define PTRAUTH_KEY(k)							\
+	__PTRAUTH_KEY(k ## KEYLO_EL1),					\
+	__PTRAUTH_KEY(k ## KEYHI_EL1)
+
+static bool access_arch_timer(struct kvm_vcpu *vcpu,
+			      struct sys_reg_params *p,
+			      const struct sys_reg_desc *r)
+{
+	enum kvm_arch_timers tmr;
+	enum kvm_arch_timer_regs treg;
+	u64 reg = reg_to_encoding(r);
+
+	switch (reg) {
+	case SYS_CNTP_TVAL_EL0:
+	case SYS_AARCH32_CNTP_TVAL:
+		tmr = TIMER_PTIMER;
+		treg = TIMER_REG_TVAL;
+		break;
+	case SYS_CNTP_CTL_EL0:
+	case SYS_AARCH32_CNTP_CTL:
+		tmr = TIMER_PTIMER;
+		treg = TIMER_REG_CTL;
+		break;
+	case SYS_CNTP_CVAL_EL0:
+	case SYS_AARCH32_CNTP_CVAL:
+		tmr = TIMER_PTIMER;
+		treg = TIMER_REG_CVAL;
+		break;
+	default:
+		BUG();
+	}
+
+	if (p->is_write)
+		kvm_arm_timer_write_sysreg(vcpu, tmr, treg, p->regval);
+	else
+		p->regval = kvm_arm_timer_read_sysreg(vcpu, tmr, treg);
+
+	return true;
+}
+
+/* Read a sanitised cpufeature ID register by sys_reg_desc */
+static u64 read_id_reg(const struct kvm_vcpu *vcpu, struct sys_reg_desc const *r)
+{
+	u32 id = reg_to_encoding(r);
+	u64 val;
+
+	if (sysreg_visible_as_raz(vcpu, r))
+		return 0;
+
+	val = read_sanitised_ftr_reg(id);
+
+	switch (id) {
+	case SYS_ID_AA64PFR0_EL1:
+		if (!vcpu_has_sve(vcpu))
+			val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_SVE);
+		val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_AMU);
+		val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2);
+		val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2), (u64)vcpu->kvm->arch.pfr0_csv2);
+		val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3);
+		val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3), (u64)vcpu->kvm->arch.pfr0_csv3);
+		if (kvm_vgic_global_state.type == VGIC_V3) {
+			val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_GIC);
+			val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_GIC), 1);
+		}
+		break;
+	case SYS_ID_AA64PFR1_EL1:
+		if (!kvm_has_mte(vcpu->kvm))
+			val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE);
+
+		val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SME);
+		break;
+	case SYS_ID_AA64ISAR1_EL1:
+		if (!vcpu_has_ptrauth(vcpu))
+			val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA) |
+				 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API) |
+				 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPA) |
+				 ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPI));
+		break;
+	case SYS_ID_AA64ISAR2_EL1:
+		if (!vcpu_has_ptrauth(vcpu))
+			val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) |
+				 ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3));
+		if (!cpus_have_final_cap(ARM64_HAS_WFXT))
+			val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT);
+		break;
+	case SYS_ID_AA64DFR0_EL1:
+		/* Limit debug to ARMv8.0 */
+		val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DebugVer);
+		val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DebugVer), 6);
+		/* Limit guests to PMUv3 for ARMv8.4 */
+		val = cpuid_feature_cap_perfmon_field(val,
+						      ID_AA64DFR0_EL1_PMUVer_SHIFT,
+						      kvm_vcpu_has_pmu(vcpu) ? ID_AA64DFR0_EL1_PMUVer_V3P4 : 0);
+		/* Hide SPE from guests */
+		val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMSVer);
+		break;
+	case SYS_ID_DFR0_EL1:
+		/* Limit guests to PMUv3 for ARMv8.4 */
+		val = cpuid_feature_cap_perfmon_field(val,
+						      ID_DFR0_PERFMON_SHIFT,
+						      kvm_vcpu_has_pmu(vcpu) ? ID_DFR0_PERFMON_8_4 : 0);
+		break;
+	}
+
+	return val;
+}
+
+static unsigned int id_visibility(const struct kvm_vcpu *vcpu,
+				  const struct sys_reg_desc *r)
+{
+	u32 id = reg_to_encoding(r);
+
+	switch (id) {
+	case SYS_ID_AA64ZFR0_EL1:
+		if (!vcpu_has_sve(vcpu))
+			return REG_RAZ;
+		break;
+	}
+
+	return 0;
+}
+
+static unsigned int aa32_id_visibility(const struct kvm_vcpu *vcpu,
+				       const struct sys_reg_desc *r)
+{
+	/*
+	 * AArch32 ID registers are UNKNOWN if AArch32 isn't implemented at any
+	 * EL. Promote to RAZ/WI in order to guarantee consistency between
+	 * systems.
+	 */
+	if (!kvm_supports_32bit_el0())
+		return REG_RAZ | REG_USER_WI;
+
+	return id_visibility(vcpu, r);
+}
+
+static unsigned int raz_visibility(const struct kvm_vcpu *vcpu,
+				   const struct sys_reg_desc *r)
+{
+	return REG_RAZ;
+}
+
+/* cpufeature ID register access trap handlers */
+
+static bool access_id_reg(struct kvm_vcpu *vcpu,
+			  struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	if (p->is_write)
+		return write_to_read_only(vcpu, p, r);
+
+	p->regval = read_id_reg(vcpu, r);
+	return true;
+}
+
+/* Visibility overrides for SVE-specific control registers */
+static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
+				   const struct sys_reg_desc *rd)
+{
+	if (vcpu_has_sve(vcpu))
+		return 0;
+
+	return REG_HIDDEN;
+}
+
+static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
+			       const struct sys_reg_desc *rd,
+			       u64 val)
+{
+	u8 csv2, csv3;
+
+	/*
+	 * Allow AA64PFR0_EL1.CSV2 to be set from userspace as long as
+	 * it doesn't promise more than what is actually provided (the
+	 * guest could otherwise be covered in ectoplasmic residue).
+	 */
+	csv2 = cpuid_feature_extract_unsigned_field(val, ID_AA64PFR0_EL1_CSV2_SHIFT);
+	if (csv2 > 1 ||
+	    (csv2 && arm64_get_spectre_v2_state() != SPECTRE_UNAFFECTED))
+		return -EINVAL;
+
+	/* Same thing for CSV3 */
+	csv3 = cpuid_feature_extract_unsigned_field(val, ID_AA64PFR0_EL1_CSV3_SHIFT);
+	if (csv3 > 1 ||
+	    (csv3 && arm64_get_meltdown_state() != SPECTRE_UNAFFECTED))
+		return -EINVAL;
+
+	/* We can only differ with CSV[23], and anything else is an error */
+	val ^= read_id_reg(vcpu, rd);
+	val &= ~(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2) |
+		 ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3));
+	if (val)
+		return -EINVAL;
+
+	vcpu->kvm->arch.pfr0_csv2 = csv2;
+	vcpu->kvm->arch.pfr0_csv3 = csv3;
+
+	return 0;
+}
+
+/*
+ * cpufeature ID register user accessors
+ *
+ * For now, these registers are immutable for userspace, so no values
+ * are stored, and for set_id_reg() we don't allow the effective value
+ * to be changed.
+ */
+static int get_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		      u64 *val)
+{
+	*val = read_id_reg(vcpu, rd);
+	return 0;
+}
+
+static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		      u64 val)
+{
+	/* This is what we mean by invariant: you can't change it. */
+	if (val != read_id_reg(vcpu, rd))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int get_raz_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		       u64 *val)
+{
+	*val = 0;
+	return 0;
+}
+
+static int set_wi_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+		      u64 val)
+{
+	return 0;
+}
+
+static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+		       const struct sys_reg_desc *r)
+{
+	if (p->is_write)
+		return write_to_read_only(vcpu, p, r);
+
+	p->regval = read_sanitised_ftr_reg(SYS_CTR_EL0);
+	return true;
+}
+
+static bool access_clidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			 const struct sys_reg_desc *r)
+{
+	if (p->is_write)
+		return write_to_read_only(vcpu, p, r);
+
+	p->regval = read_sysreg(clidr_el1);
+	return true;
+}
+
+static bool access_csselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	int reg = r->reg;
+
+	if (p->is_write)
+		vcpu_write_sys_reg(vcpu, p->regval, reg);
+	else
+		p->regval = vcpu_read_sys_reg(vcpu, reg);
+	return true;
+}
+
+static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	u32 csselr;
+
+	if (p->is_write)
+		return write_to_read_only(vcpu, p, r);
+
+	csselr = vcpu_read_sys_reg(vcpu, CSSELR_EL1);
+	p->regval = get_ccsidr(csselr);
+
+	/*
+	 * Guests should not be doing cache operations by set/way at all, and
+	 * for this reason, we trap them and attempt to infer the intent, so
+	 * that we can flush the entire guest's address space at the appropriate
+	 * time.
+	 * To prevent this trapping from causing performance problems, let's
+	 * expose the geometry of all data and unified caches (which are
+	 * guaranteed to be PIPT and thus non-aliasing) as 1 set and 1 way.
+	 * [If guests should attempt to infer aliasing properties from the
+	 * geometry (which is not permitted by the architecture), they would
+	 * only do so for virtually indexed caches.]
+	 */
+	if (!(csselr & 1)) // data or unified cache
+		p->regval &= ~GENMASK(27, 3);
+	return true;
+}
+
+static unsigned int mte_visibility(const struct kvm_vcpu *vcpu,
+				   const struct sys_reg_desc *rd)
+{
+	if (kvm_has_mte(vcpu->kvm))
+		return 0;
+
+	return REG_HIDDEN;
+}
+
+#define MTE_REG(name) {				\
+	SYS_DESC(SYS_##name),			\
+	.access = undef_access,			\
+	.reset = reset_unknown,			\
+	.reg = name,				\
+	.visibility = mte_visibility,		\
+}
+
+/* sys_reg_desc initialiser for known cpufeature ID registers */
+#define ID_SANITISED(name) {			\
+	SYS_DESC(SYS_##name),			\
+	.access	= access_id_reg,		\
+	.get_user = get_id_reg,			\
+	.set_user = set_id_reg,			\
+	.visibility = id_visibility,		\
+}
+
+/* sys_reg_desc initialiser for known cpufeature ID registers */
+#define AA32_ID_SANITISED(name) {		\
+	SYS_DESC(SYS_##name),			\
+	.access	= access_id_reg,		\
+	.get_user = get_id_reg,			\
+	.set_user = set_id_reg,			\
+	.visibility = aa32_id_visibility,	\
+}
+
+/*
+ * sys_reg_desc initialiser for architecturally unallocated cpufeature ID
+ * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2
+ * (1 <= crm < 8, 0 <= Op2 < 8).
+ */
+#define ID_UNALLOCATED(crm, op2) {			\
+	Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2),	\
+	.access = access_id_reg,			\
+	.get_user = get_id_reg,				\
+	.set_user = set_id_reg,				\
+	.visibility = raz_visibility			\
+}
+
+/*
+ * sys_reg_desc initialiser for known ID registers that we hide from guests.
+ * For now, these are exposed just like unallocated ID regs: they appear
+ * RAZ for the guest.
+ */
+#define ID_HIDDEN(name) {			\
+	SYS_DESC(SYS_##name),			\
+	.access = access_id_reg,		\
+	.get_user = get_id_reg,			\
+	.set_user = set_id_reg,			\
+	.visibility = raz_visibility,		\
+}
+
+/*
+ * Architected system registers.
+ * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
+ *
+ * Debug handling: We do trap most, if not all debug related system
+ * registers. The implementation is good enough to ensure that a guest
+ * can use these with minimal performance degradation. The drawback is
+ * that we don't implement any of the external debug architecture.
+ * This should be revisited if we ever encounter a more demanding
+ * guest...
+ */
+static const struct sys_reg_desc sys_reg_descs[] = {
+	{ SYS_DESC(SYS_DC_ISW), access_dcsw },
+	{ SYS_DESC(SYS_DC_CSW), access_dcsw },
+	{ SYS_DESC(SYS_DC_CISW), access_dcsw },
+
+	DBG_BCR_BVR_WCR_WVR_EL1(0),
+	DBG_BCR_BVR_WCR_WVR_EL1(1),
+	{ SYS_DESC(SYS_MDCCINT_EL1), trap_debug_regs, reset_val, MDCCINT_EL1, 0 },
+	{ SYS_DESC(SYS_MDSCR_EL1), trap_debug_regs, reset_val, MDSCR_EL1, 0 },
+	DBG_BCR_BVR_WCR_WVR_EL1(2),
+	DBG_BCR_BVR_WCR_WVR_EL1(3),
+	DBG_BCR_BVR_WCR_WVR_EL1(4),
+	DBG_BCR_BVR_WCR_WVR_EL1(5),
+	DBG_BCR_BVR_WCR_WVR_EL1(6),
+	DBG_BCR_BVR_WCR_WVR_EL1(7),
+	DBG_BCR_BVR_WCR_WVR_EL1(8),
+	DBG_BCR_BVR_WCR_WVR_EL1(9),
+	DBG_BCR_BVR_WCR_WVR_EL1(10),
+	DBG_BCR_BVR_WCR_WVR_EL1(11),
+	DBG_BCR_BVR_WCR_WVR_EL1(12),
+	DBG_BCR_BVR_WCR_WVR_EL1(13),
+	DBG_BCR_BVR_WCR_WVR_EL1(14),
+	DBG_BCR_BVR_WCR_WVR_EL1(15),
+
+	{ SYS_DESC(SYS_MDRAR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_OSLAR_EL1), trap_oslar_el1 },
+	{ SYS_DESC(SYS_OSLSR_EL1), trap_oslsr_el1, reset_val, OSLSR_EL1,
+		SYS_OSLSR_OSLM_IMPLEMENTED, .set_user = set_oslsr_el1, },
+	{ SYS_DESC(SYS_OSDLR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_DBGPRCR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_DBGCLAIMSET_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_DBGCLAIMCLR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_DBGAUTHSTATUS_EL1), trap_dbgauthstatus_el1 },
+
+	{ SYS_DESC(SYS_MDCCSR_EL0), trap_raz_wi },
+	{ SYS_DESC(SYS_DBGDTR_EL0), trap_raz_wi },
+	// DBGDTR[TR]X_EL0 share the same encoding
+	{ SYS_DESC(SYS_DBGDTRTX_EL0), trap_raz_wi },
+
+	{ SYS_DESC(SYS_DBGVCR32_EL2), NULL, reset_val, DBGVCR32_EL2, 0 },
+
+	{ SYS_DESC(SYS_MPIDR_EL1), NULL, reset_mpidr, MPIDR_EL1 },
+
+	/*
+	 * ID regs: all ID_SANITISED() entries here must have corresponding
+	 * entries in arm64_ftr_regs[].
+	 */
+
+	/* AArch64 mappings of the AArch32 ID registers */
+	/* CRm=1 */
+	AA32_ID_SANITISED(ID_PFR0_EL1),
+	AA32_ID_SANITISED(ID_PFR1_EL1),
+	AA32_ID_SANITISED(ID_DFR0_EL1),
+	ID_HIDDEN(ID_AFR0_EL1),
+	AA32_ID_SANITISED(ID_MMFR0_EL1),
+	AA32_ID_SANITISED(ID_MMFR1_EL1),
+	AA32_ID_SANITISED(ID_MMFR2_EL1),
+	AA32_ID_SANITISED(ID_MMFR3_EL1),
+
+	/* CRm=2 */
+	AA32_ID_SANITISED(ID_ISAR0_EL1),
+	AA32_ID_SANITISED(ID_ISAR1_EL1),
+	AA32_ID_SANITISED(ID_ISAR2_EL1),
+	AA32_ID_SANITISED(ID_ISAR3_EL1),
+	AA32_ID_SANITISED(ID_ISAR4_EL1),
+	AA32_ID_SANITISED(ID_ISAR5_EL1),
+	AA32_ID_SANITISED(ID_MMFR4_EL1),
+	AA32_ID_SANITISED(ID_ISAR6_EL1),
+
+	/* CRm=3 */
+	AA32_ID_SANITISED(MVFR0_EL1),
+	AA32_ID_SANITISED(MVFR1_EL1),
+	AA32_ID_SANITISED(MVFR2_EL1),
+	ID_UNALLOCATED(3,3),
+	AA32_ID_SANITISED(ID_PFR2_EL1),
+	ID_HIDDEN(ID_DFR1_EL1),
+	AA32_ID_SANITISED(ID_MMFR5_EL1),
+	ID_UNALLOCATED(3,7),
+
+	/* AArch64 ID registers */
+	/* CRm=4 */
+	{ SYS_DESC(SYS_ID_AA64PFR0_EL1), .access = access_id_reg,
+	  .get_user = get_id_reg, .set_user = set_id_aa64pfr0_el1, },
+	ID_SANITISED(ID_AA64PFR1_EL1),
+	ID_UNALLOCATED(4,2),
+	ID_UNALLOCATED(4,3),
+	ID_SANITISED(ID_AA64ZFR0_EL1),
+	ID_HIDDEN(ID_AA64SMFR0_EL1),
+	ID_UNALLOCATED(4,6),
+	ID_UNALLOCATED(4,7),
+
+	/* CRm=5 */
+	ID_SANITISED(ID_AA64DFR0_EL1),
+	ID_SANITISED(ID_AA64DFR1_EL1),
+	ID_UNALLOCATED(5,2),
+	ID_UNALLOCATED(5,3),
+	ID_HIDDEN(ID_AA64AFR0_EL1),
+	ID_HIDDEN(ID_AA64AFR1_EL1),
+	ID_UNALLOCATED(5,6),
+	ID_UNALLOCATED(5,7),
+
+	/* CRm=6 */
+	ID_SANITISED(ID_AA64ISAR0_EL1),
+	ID_SANITISED(ID_AA64ISAR1_EL1),
+	ID_SANITISED(ID_AA64ISAR2_EL1),
+	ID_UNALLOCATED(6,3),
+	ID_UNALLOCATED(6,4),
+	ID_UNALLOCATED(6,5),
+	ID_UNALLOCATED(6,6),
+	ID_UNALLOCATED(6,7),
+
+	/* CRm=7 */
+	ID_SANITISED(ID_AA64MMFR0_EL1),
+	ID_SANITISED(ID_AA64MMFR1_EL1),
+	ID_SANITISED(ID_AA64MMFR2_EL1),
+	ID_UNALLOCATED(7,3),
+	ID_UNALLOCATED(7,4),
+	ID_UNALLOCATED(7,5),
+	ID_UNALLOCATED(7,6),
+	ID_UNALLOCATED(7,7),
+
+	{ SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 },
+	{ SYS_DESC(SYS_ACTLR_EL1), access_actlr, reset_actlr, ACTLR_EL1 },
+	{ SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 },
+
+	MTE_REG(RGSR_EL1),
+	MTE_REG(GCR_EL1),
+
+	{ SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility },
+	{ SYS_DESC(SYS_TRFCR_EL1), undef_access },
+	{ SYS_DESC(SYS_SMPRI_EL1), undef_access },
+	{ SYS_DESC(SYS_SMCR_EL1), undef_access },
+	{ SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 },
+	{ SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 },
+	{ SYS_DESC(SYS_TCR_EL1), access_vm_reg, reset_val, TCR_EL1, 0 },
+
+	PTRAUTH_KEY(APIA),
+	PTRAUTH_KEY(APIB),
+	PTRAUTH_KEY(APDA),
+	PTRAUTH_KEY(APDB),
+	PTRAUTH_KEY(APGA),
+
+	{ SYS_DESC(SYS_AFSR0_EL1), access_vm_reg, reset_unknown, AFSR0_EL1 },
+	{ SYS_DESC(SYS_AFSR1_EL1), access_vm_reg, reset_unknown, AFSR1_EL1 },
+	{ SYS_DESC(SYS_ESR_EL1), access_vm_reg, reset_unknown, ESR_EL1 },
+
+	{ SYS_DESC(SYS_ERRIDR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERRSELR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXFR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXCTLR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXSTATUS_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXADDR_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi },
+	{ SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi },
+
+	MTE_REG(TFSR_EL1),
+	MTE_REG(TFSRE0_EL1),
+
+	{ SYS_DESC(SYS_FAR_EL1), access_vm_reg, reset_unknown, FAR_EL1 },
+	{ SYS_DESC(SYS_PAR_EL1), NULL, reset_unknown, PAR_EL1 },
+
+	{ SYS_DESC(SYS_PMSCR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMSNEVFR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMSICR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMSIRR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMSFCR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMSEVFR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMSLATFR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMSIDR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMBLIMITR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMBPTR_EL1), undef_access },
+	{ SYS_DESC(SYS_PMBSR_EL1), undef_access },
+	/* PMBIDR_EL1 is not trapped */
+
+	{ PMU_SYS_REG(SYS_PMINTENSET_EL1),
+	  .access = access_pminten, .reg = PMINTENSET_EL1 },
+	{ PMU_SYS_REG(SYS_PMINTENCLR_EL1),
+	  .access = access_pminten, .reg = PMINTENSET_EL1 },
+	{ SYS_DESC(SYS_PMMIR_EL1), trap_raz_wi },
+
+	{ SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 },
+	{ SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 },
+
+	{ SYS_DESC(SYS_LORSA_EL1), trap_loregion },
+	{ SYS_DESC(SYS_LOREA_EL1), trap_loregion },
+	{ SYS_DESC(SYS_LORN_EL1), trap_loregion },
+	{ SYS_DESC(SYS_LORC_EL1), trap_loregion },
+	{ SYS_DESC(SYS_LORID_EL1), trap_loregion },
+
+	{ SYS_DESC(SYS_VBAR_EL1), NULL, reset_val, VBAR_EL1, 0 },
+	{ SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 },
+
+	{ SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only },
+	{ SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only },
+	{ SYS_DESC(SYS_ICC_HPPIR0_EL1), write_to_read_only },
+	{ SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only },
+	{ SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only },
+	{ SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi },
+	{ SYS_DESC(SYS_ICC_ASGI1R_EL1), access_gic_sgi },
+	{ SYS_DESC(SYS_ICC_SGI0R_EL1), access_gic_sgi },
+	{ SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only },
+	{ SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only },
+	{ SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only },
+	{ SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre },
+
+	{ SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 },
+	{ SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 },
+
+	{ SYS_DESC(SYS_SCXTNUM_EL1), undef_access },
+
+	{ SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0},
+
+	{ SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr },
+	{ SYS_DESC(SYS_CLIDR_EL1), access_clidr },
+	{ SYS_DESC(SYS_SMIDR_EL1), undef_access },
+	{ SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 },
+	{ SYS_DESC(SYS_CTR_EL0), access_ctr },
+	{ SYS_DESC(SYS_SVCR), undef_access },
+
+	{ PMU_SYS_REG(SYS_PMCR_EL0), .access = access_pmcr,
+	  .reset = reset_pmcr, .reg = PMCR_EL0 },
+	{ PMU_SYS_REG(SYS_PMCNTENSET_EL0),
+	  .access = access_pmcnten, .reg = PMCNTENSET_EL0 },
+	{ PMU_SYS_REG(SYS_PMCNTENCLR_EL0),
+	  .access = access_pmcnten, .reg = PMCNTENSET_EL0 },
+	{ PMU_SYS_REG(SYS_PMOVSCLR_EL0),
+	  .access = access_pmovs, .reg = PMOVSSET_EL0 },
+	/*
+	 * PM_SWINC_EL0 is exposed to userspace as RAZ/WI, as it was
+	 * previously (and pointlessly) advertised in the past...
+	 */
+	{ PMU_SYS_REG(SYS_PMSWINC_EL0),
+	  .get_user = get_raz_reg, .set_user = set_wi_reg,
+	  .access = access_pmswinc, .reset = NULL },
+	{ PMU_SYS_REG(SYS_PMSELR_EL0),
+	  .access = access_pmselr, .reset = reset_pmselr, .reg = PMSELR_EL0 },
+	{ PMU_SYS_REG(SYS_PMCEID0_EL0),
+	  .access = access_pmceid, .reset = NULL },
+	{ PMU_SYS_REG(SYS_PMCEID1_EL0),
+	  .access = access_pmceid, .reset = NULL },
+	{ PMU_SYS_REG(SYS_PMCCNTR_EL0),
+	  .access = access_pmu_evcntr, .reset = reset_unknown,
+	  .reg = PMCCNTR_EL0, .get_user = get_pmu_evcntr},
+	{ PMU_SYS_REG(SYS_PMXEVTYPER_EL0),
+	  .access = access_pmu_evtyper, .reset = NULL },
+	{ PMU_SYS_REG(SYS_PMXEVCNTR_EL0),
+	  .access = access_pmu_evcntr, .reset = NULL },
+	/*
+	 * PMUSERENR_EL0 resets as unknown in 64bit mode while it resets as zero
+	 * in 32bit mode. Here we choose to reset it as zero for consistency.
+	 */
+	{ PMU_SYS_REG(SYS_PMUSERENR_EL0), .access = access_pmuserenr,
+	  .reset = reset_val, .reg = PMUSERENR_EL0, .val = 0 },
+	{ PMU_SYS_REG(SYS_PMOVSSET_EL0),
+	  .access = access_pmovs, .reg = PMOVSSET_EL0 },
+
+	{ SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
+	{ SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
+	{ SYS_DESC(SYS_TPIDR2_EL0), undef_access },
+
+	{ SYS_DESC(SYS_SCXTNUM_EL0), undef_access },
+
+	{ SYS_DESC(SYS_AMCR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCFGR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCGCR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMUSERENR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENCLR0_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENSET0_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENCLR1_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENSET1_EL0), undef_access },
+	AMU_AMEVCNTR0_EL0(0),
+	AMU_AMEVCNTR0_EL0(1),
+	AMU_AMEVCNTR0_EL0(2),
+	AMU_AMEVCNTR0_EL0(3),
+	AMU_AMEVCNTR0_EL0(4),
+	AMU_AMEVCNTR0_EL0(5),
+	AMU_AMEVCNTR0_EL0(6),
+	AMU_AMEVCNTR0_EL0(7),
+	AMU_AMEVCNTR0_EL0(8),
+	AMU_AMEVCNTR0_EL0(9),
+	AMU_AMEVCNTR0_EL0(10),
+	AMU_AMEVCNTR0_EL0(11),
+	AMU_AMEVCNTR0_EL0(12),
+	AMU_AMEVCNTR0_EL0(13),
+	AMU_AMEVCNTR0_EL0(14),
+	AMU_AMEVCNTR0_EL0(15),
+	AMU_AMEVTYPER0_EL0(0),
+	AMU_AMEVTYPER0_EL0(1),
+	AMU_AMEVTYPER0_EL0(2),
+	AMU_AMEVTYPER0_EL0(3),
+	AMU_AMEVTYPER0_EL0(4),
+	AMU_AMEVTYPER0_EL0(5),
+	AMU_AMEVTYPER0_EL0(6),
+	AMU_AMEVTYPER0_EL0(7),
+	AMU_AMEVTYPER0_EL0(8),
+	AMU_AMEVTYPER0_EL0(9),
+	AMU_AMEVTYPER0_EL0(10),
+	AMU_AMEVTYPER0_EL0(11),
+	AMU_AMEVTYPER0_EL0(12),
+	AMU_AMEVTYPER0_EL0(13),
+	AMU_AMEVTYPER0_EL0(14),
+	AMU_AMEVTYPER0_EL0(15),
+	AMU_AMEVCNTR1_EL0(0),
+	AMU_AMEVCNTR1_EL0(1),
+	AMU_AMEVCNTR1_EL0(2),
+	AMU_AMEVCNTR1_EL0(3),
+	AMU_AMEVCNTR1_EL0(4),
+	AMU_AMEVCNTR1_EL0(5),
+	AMU_AMEVCNTR1_EL0(6),
+	AMU_AMEVCNTR1_EL0(7),
+	AMU_AMEVCNTR1_EL0(8),
+	AMU_AMEVCNTR1_EL0(9),
+	AMU_AMEVCNTR1_EL0(10),
+	AMU_AMEVCNTR1_EL0(11),
+	AMU_AMEVCNTR1_EL0(12),
+	AMU_AMEVCNTR1_EL0(13),
+	AMU_AMEVCNTR1_EL0(14),
+	AMU_AMEVCNTR1_EL0(15),
+	AMU_AMEVTYPER1_EL0(0),
+	AMU_AMEVTYPER1_EL0(1),
+	AMU_AMEVTYPER1_EL0(2),
+	AMU_AMEVTYPER1_EL0(3),
+	AMU_AMEVTYPER1_EL0(4),
+	AMU_AMEVTYPER1_EL0(5),
+	AMU_AMEVTYPER1_EL0(6),
+	AMU_AMEVTYPER1_EL0(7),
+	AMU_AMEVTYPER1_EL0(8),
+	AMU_AMEVTYPER1_EL0(9),
+	AMU_AMEVTYPER1_EL0(10),
+	AMU_AMEVTYPER1_EL0(11),
+	AMU_AMEVTYPER1_EL0(12),
+	AMU_AMEVTYPER1_EL0(13),
+	AMU_AMEVTYPER1_EL0(14),
+	AMU_AMEVTYPER1_EL0(15),
+
+	{ SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer },
+	{ SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer },
+	{ SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer },
+
+	/* PMEVCNTRn_EL0 */
+	PMU_PMEVCNTR_EL0(0),
+	PMU_PMEVCNTR_EL0(1),
+	PMU_PMEVCNTR_EL0(2),
+	PMU_PMEVCNTR_EL0(3),
+	PMU_PMEVCNTR_EL0(4),
+	PMU_PMEVCNTR_EL0(5),
+	PMU_PMEVCNTR_EL0(6),
+	PMU_PMEVCNTR_EL0(7),
+	PMU_PMEVCNTR_EL0(8),
+	PMU_PMEVCNTR_EL0(9),
+	PMU_PMEVCNTR_EL0(10),
+	PMU_PMEVCNTR_EL0(11),
+	PMU_PMEVCNTR_EL0(12),
+	PMU_PMEVCNTR_EL0(13),
+	PMU_PMEVCNTR_EL0(14),
+	PMU_PMEVCNTR_EL0(15),
+	PMU_PMEVCNTR_EL0(16),
+	PMU_PMEVCNTR_EL0(17),
+	PMU_PMEVCNTR_EL0(18),
+	PMU_PMEVCNTR_EL0(19),
+	PMU_PMEVCNTR_EL0(20),
+	PMU_PMEVCNTR_EL0(21),
+	PMU_PMEVCNTR_EL0(22),
+	PMU_PMEVCNTR_EL0(23),
+	PMU_PMEVCNTR_EL0(24),
+	PMU_PMEVCNTR_EL0(25),
+	PMU_PMEVCNTR_EL0(26),
+	PMU_PMEVCNTR_EL0(27),
+	PMU_PMEVCNTR_EL0(28),
+	PMU_PMEVCNTR_EL0(29),
+	PMU_PMEVCNTR_EL0(30),
+	/* PMEVTYPERn_EL0 */
+	PMU_PMEVTYPER_EL0(0),
+	PMU_PMEVTYPER_EL0(1),
+	PMU_PMEVTYPER_EL0(2),
+	PMU_PMEVTYPER_EL0(3),
+	PMU_PMEVTYPER_EL0(4),
+	PMU_PMEVTYPER_EL0(5),
+	PMU_PMEVTYPER_EL0(6),
+	PMU_PMEVTYPER_EL0(7),
+	PMU_PMEVTYPER_EL0(8),
+	PMU_PMEVTYPER_EL0(9),
+	PMU_PMEVTYPER_EL0(10),
+	PMU_PMEVTYPER_EL0(11),
+	PMU_PMEVTYPER_EL0(12),
+	PMU_PMEVTYPER_EL0(13),
+	PMU_PMEVTYPER_EL0(14),
+	PMU_PMEVTYPER_EL0(15),
+	PMU_PMEVTYPER_EL0(16),
+	PMU_PMEVTYPER_EL0(17),
+	PMU_PMEVTYPER_EL0(18),
+	PMU_PMEVTYPER_EL0(19),
+	PMU_PMEVTYPER_EL0(20),
+	PMU_PMEVTYPER_EL0(21),
+	PMU_PMEVTYPER_EL0(22),
+	PMU_PMEVTYPER_EL0(23),
+	PMU_PMEVTYPER_EL0(24),
+	PMU_PMEVTYPER_EL0(25),
+	PMU_PMEVTYPER_EL0(26),
+	PMU_PMEVTYPER_EL0(27),
+	PMU_PMEVTYPER_EL0(28),
+	PMU_PMEVTYPER_EL0(29),
+	PMU_PMEVTYPER_EL0(30),
+	/*
+	 * PMCCFILTR_EL0 resets as unknown in 64bit mode while it resets as zero
+	 * in 32bit mode. Here we choose to reset it as zero for consistency.
+	 */
+	{ PMU_SYS_REG(SYS_PMCCFILTR_EL0), .access = access_pmu_evtyper,
+	  .reset = reset_val, .reg = PMCCFILTR_EL0, .val = 0 },
+
+	{ SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 },
+	{ SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 },
+	{ SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 },
+};
+
+static bool trap_dbgdidr(struct kvm_vcpu *vcpu,
+			struct sys_reg_params *p,
+			const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		return ignore_write(vcpu, p);
+	} else {
+		u64 dfr = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1);
+		u64 pfr = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
+		u32 el3 = !!cpuid_feature_extract_unsigned_field(pfr, ID_AA64PFR0_EL1_EL3_SHIFT);
+
+		p->regval = ((((dfr >> ID_AA64DFR0_EL1_WRPs_SHIFT) & 0xf) << 28) |
+			     (((dfr >> ID_AA64DFR0_EL1_BRPs_SHIFT) & 0xf) << 24) |
+			     (((dfr >> ID_AA64DFR0_EL1_CTX_CMPs_SHIFT) & 0xf) << 20)
+			     | (6 << 16) | (1 << 15) | (el3 << 14) | (el3 << 12));
+		return true;
+	}
+}
+
+/*
+ * AArch32 debug register mappings
+ *
+ * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0]
+ * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32]
+ *
+ * None of the other registers share their location, so treat them as
+ * if they were 64bit.
+ */
+#define DBG_BCR_BVR_WCR_WVR(n)						      \
+	/* DBGBVRn */							      \
+	{ AA32(LO), Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n }, \
+	/* DBGBCRn */							      \
+	{ Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n },	      \
+	/* DBGWVRn */							      \
+	{ Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n },	      \
+	/* DBGWCRn */							      \
+	{ Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n }
+
+#define DBGBXVR(n)							      \
+	{ AA32(HI), Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_bvr, NULL, n }
+
+/*
+ * Trapped cp14 registers. We generally ignore most of the external
+ * debug, on the principle that they don't really make sense to a
+ * guest. Revisit this one day, would this principle change.
+ */
+static const struct sys_reg_desc cp14_regs[] = {
+	/* DBGDIDR */
+	{ Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgdidr },
+	/* DBGDTRRXext */
+	{ Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi },
+
+	DBG_BCR_BVR_WCR_WVR(0),
+	/* DBGDSCRint */
+	{ Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi },
+	DBG_BCR_BVR_WCR_WVR(1),
+	/* DBGDCCINT */
+	{ Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug_regs, NULL, MDCCINT_EL1 },
+	/* DBGDSCRext */
+	{ Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug_regs, NULL, MDSCR_EL1 },
+	DBG_BCR_BVR_WCR_WVR(2),
+	/* DBGDTR[RT]Xint */
+	{ Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi },
+	/* DBGDTR[RT]Xext */
+	{ Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi },
+	DBG_BCR_BVR_WCR_WVR(3),
+	DBG_BCR_BVR_WCR_WVR(4),
+	DBG_BCR_BVR_WCR_WVR(5),
+	/* DBGWFAR */
+	{ Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi },
+	/* DBGOSECCR */
+	{ Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi },
+	DBG_BCR_BVR_WCR_WVR(6),
+	/* DBGVCR */
+	{ Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug_regs, NULL, DBGVCR32_EL2 },
+	DBG_BCR_BVR_WCR_WVR(7),
+	DBG_BCR_BVR_WCR_WVR(8),
+	DBG_BCR_BVR_WCR_WVR(9),
+	DBG_BCR_BVR_WCR_WVR(10),
+	DBG_BCR_BVR_WCR_WVR(11),
+	DBG_BCR_BVR_WCR_WVR(12),
+	DBG_BCR_BVR_WCR_WVR(13),
+	DBG_BCR_BVR_WCR_WVR(14),
+	DBG_BCR_BVR_WCR_WVR(15),
+
+	/* DBGDRAR (32bit) */
+	{ Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi },
+
+	DBGBXVR(0),
+	/* DBGOSLAR */
+	{ Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_oslar_el1 },
+	DBGBXVR(1),
+	/* DBGOSLSR */
+	{ Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1, NULL, OSLSR_EL1 },
+	DBGBXVR(2),
+	DBGBXVR(3),
+	/* DBGOSDLR */
+	{ Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi },
+	DBGBXVR(4),
+	/* DBGPRCR */
+	{ Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi },
+	DBGBXVR(5),
+	DBGBXVR(6),
+	DBGBXVR(7),
+	DBGBXVR(8),
+	DBGBXVR(9),
+	DBGBXVR(10),
+	DBGBXVR(11),
+	DBGBXVR(12),
+	DBGBXVR(13),
+	DBGBXVR(14),
+	DBGBXVR(15),
+
+	/* DBGDSAR (32bit) */
+	{ Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi },
+
+	/* DBGDEVID2 */
+	{ Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi },
+	/* DBGDEVID1 */
+	{ Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi },
+	/* DBGDEVID */
+	{ Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi },
+	/* DBGCLAIMSET */
+	{ Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi },
+	/* DBGCLAIMCLR */
+	{ Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi },
+	/* DBGAUTHSTATUS */
+	{ Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 },
+};
+
+/* Trapped cp14 64bit registers */
+static const struct sys_reg_desc cp14_64_regs[] = {
+	/* DBGDRAR (64bit) */
+	{ Op1( 0), CRm( 1), .access = trap_raz_wi },
+
+	/* DBGDSAR (64bit) */
+	{ Op1( 0), CRm( 2), .access = trap_raz_wi },
+};
+
+#define CP15_PMU_SYS_REG(_map, _Op1, _CRn, _CRm, _Op2)			\
+	AA32(_map),							\
+	Op1(_Op1), CRn(_CRn), CRm(_CRm), Op2(_Op2),			\
+	.visibility = pmu_visibility
+
+/* Macro to expand the PMEVCNTRn register */
+#define PMU_PMEVCNTR(n)							\
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 0b1110,				\
+	  (0b1000 | (((n) >> 3) & 0x3)), ((n) & 0x7)),			\
+	  .access = access_pmu_evcntr }
+
+/* Macro to expand the PMEVTYPERn register */
+#define PMU_PMEVTYPER(n)						\
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 0b1110,				\
+	  (0b1100 | (((n) >> 3) & 0x3)), ((n) & 0x7)),			\
+	  .access = access_pmu_evtyper }
+/*
+ * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding,
+ * depending on the way they are accessed (as a 32bit or a 64bit
+ * register).
+ */
+static const struct sys_reg_desc cp15_regs[] = {
+	{ Op1( 0), CRn( 0), CRm( 0), Op2( 1), access_ctr },
+	{ Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, SCTLR_EL1 },
+	/* ACTLR */
+	{ AA32(LO), Op1( 0), CRn( 1), CRm( 0), Op2( 1), access_actlr, NULL, ACTLR_EL1 },
+	/* ACTLR2 */
+	{ AA32(HI), Op1( 0), CRn( 1), CRm( 0), Op2( 3), access_actlr, NULL, ACTLR_EL1 },
+	{ Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 },
+	{ Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, TTBR1_EL1 },
+	/* TTBCR */
+	{ AA32(LO), Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, TCR_EL1 },
+	/* TTBCR2 */
+	{ AA32(HI), Op1( 0), CRn( 2), CRm( 0), Op2( 3), access_vm_reg, NULL, TCR_EL1 },
+	{ Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, DACR32_EL2 },
+	/* DFSR */
+	{ Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, ESR_EL1 },
+	{ Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, IFSR32_EL2 },
+	/* ADFSR */
+	{ Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, AFSR0_EL1 },
+	/* AIFSR */
+	{ Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, AFSR1_EL1 },
+	/* DFAR */
+	{ AA32(LO), Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, FAR_EL1 },
+	/* IFAR */
+	{ AA32(HI), Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, FAR_EL1 },
+
+	/*
+	 * DC{C,I,CI}SW operations:
+	 */
+	{ Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw },
+	{ Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw },
+	{ Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw },
+
+	/* PMU */
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 0), .access = access_pmcr },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 1), .access = access_pmcnten },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 2), .access = access_pmcnten },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 3), .access = access_pmovs },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 4), .access = access_pmswinc },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 5), .access = access_pmselr },
+	{ CP15_PMU_SYS_REG(LO,     0, 9, 12, 6), .access = access_pmceid },
+	{ CP15_PMU_SYS_REG(LO,     0, 9, 12, 7), .access = access_pmceid },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 0), .access = access_pmu_evcntr },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 1), .access = access_pmu_evtyper },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 2), .access = access_pmu_evcntr },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 0), .access = access_pmuserenr },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 1), .access = access_pminten },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 2), .access = access_pminten },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 3), .access = access_pmovs },
+	{ CP15_PMU_SYS_REG(HI,     0, 9, 14, 4), .access = access_pmceid },
+	{ CP15_PMU_SYS_REG(HI,     0, 9, 14, 5), .access = access_pmceid },
+	/* PMMIR */
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 6), .access = trap_raz_wi },
+
+	/* PRRR/MAIR0 */
+	{ AA32(LO), Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, MAIR_EL1 },
+	/* NMRR/MAIR1 */
+	{ AA32(HI), Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, MAIR_EL1 },
+	/* AMAIR0 */
+	{ AA32(LO), Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, AMAIR_EL1 },
+	/* AMAIR1 */
+	{ AA32(HI), Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, AMAIR_EL1 },
+
+	/* ICC_SRE */
+	{ Op1( 0), CRn(12), CRm(12), Op2( 5), access_gic_sre },
+
+	{ Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, CONTEXTIDR_EL1 },
+
+	/* Arch Tmers */
+	{ SYS_DESC(SYS_AARCH32_CNTP_TVAL), access_arch_timer },
+	{ SYS_DESC(SYS_AARCH32_CNTP_CTL), access_arch_timer },
+
+	/* PMEVCNTRn */
+	PMU_PMEVCNTR(0),
+	PMU_PMEVCNTR(1),
+	PMU_PMEVCNTR(2),
+	PMU_PMEVCNTR(3),
+	PMU_PMEVCNTR(4),
+	PMU_PMEVCNTR(5),
+	PMU_PMEVCNTR(6),
+	PMU_PMEVCNTR(7),
+	PMU_PMEVCNTR(8),
+	PMU_PMEVCNTR(9),
+	PMU_PMEVCNTR(10),
+	PMU_PMEVCNTR(11),
+	PMU_PMEVCNTR(12),
+	PMU_PMEVCNTR(13),
+	PMU_PMEVCNTR(14),
+	PMU_PMEVCNTR(15),
+	PMU_PMEVCNTR(16),
+	PMU_PMEVCNTR(17),
+	PMU_PMEVCNTR(18),
+	PMU_PMEVCNTR(19),
+	PMU_PMEVCNTR(20),
+	PMU_PMEVCNTR(21),
+	PMU_PMEVCNTR(22),
+	PMU_PMEVCNTR(23),
+	PMU_PMEVCNTR(24),
+	PMU_PMEVCNTR(25),
+	PMU_PMEVCNTR(26),
+	PMU_PMEVCNTR(27),
+	PMU_PMEVCNTR(28),
+	PMU_PMEVCNTR(29),
+	PMU_PMEVCNTR(30),
+	/* PMEVTYPERn */
+	PMU_PMEVTYPER(0),
+	PMU_PMEVTYPER(1),
+	PMU_PMEVTYPER(2),
+	PMU_PMEVTYPER(3),
+	PMU_PMEVTYPER(4),
+	PMU_PMEVTYPER(5),
+	PMU_PMEVTYPER(6),
+	PMU_PMEVTYPER(7),
+	PMU_PMEVTYPER(8),
+	PMU_PMEVTYPER(9),
+	PMU_PMEVTYPER(10),
+	PMU_PMEVTYPER(11),
+	PMU_PMEVTYPER(12),
+	PMU_PMEVTYPER(13),
+	PMU_PMEVTYPER(14),
+	PMU_PMEVTYPER(15),
+	PMU_PMEVTYPER(16),
+	PMU_PMEVTYPER(17),
+	PMU_PMEVTYPER(18),
+	PMU_PMEVTYPER(19),
+	PMU_PMEVTYPER(20),
+	PMU_PMEVTYPER(21),
+	PMU_PMEVTYPER(22),
+	PMU_PMEVTYPER(23),
+	PMU_PMEVTYPER(24),
+	PMU_PMEVTYPER(25),
+	PMU_PMEVTYPER(26),
+	PMU_PMEVTYPER(27),
+	PMU_PMEVTYPER(28),
+	PMU_PMEVTYPER(29),
+	PMU_PMEVTYPER(30),
+	/* PMCCFILTR */
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 14, 15, 7), .access = access_pmu_evtyper },
+
+	{ Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr },
+	{ Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr },
+	{ Op1(2), CRn( 0), CRm( 0), Op2(0), access_csselr, NULL, CSSELR_EL1 },
+};
+
+static const struct sys_reg_desc cp15_64_regs[] = {
+	{ Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 },
+	{ CP15_PMU_SYS_REG(DIRECT, 0, 0, 9, 0), .access = access_pmu_evcntr },
+	{ Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */
+	{ Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR1_EL1 },
+	{ Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */
+	{ Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */
+	{ SYS_DESC(SYS_AARCH32_CNTP_CVAL),    access_arch_timer },
+};
+
+static bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n,
+			       bool is_32)
+{
+	unsigned int i;
+
+	for (i = 0; i < n; i++) {
+		if (!is_32 && table[i].reg && !table[i].reset) {
+			kvm_err("sys_reg table %pS entry %d lacks reset\n", &table[i], i);
+			return false;
+		}
+
+		if (i && cmp_sys_reg(&table[i-1], &table[i]) >= 0) {
+			kvm_err("sys_reg table %pS entry %d out of order\n", &table[i - 1], i - 1);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu)
+{
+	kvm_inject_undefined(vcpu);
+	return 1;
+}
+
+static void perform_access(struct kvm_vcpu *vcpu,
+			   struct sys_reg_params *params,
+			   const struct sys_reg_desc *r)
+{
+	trace_kvm_sys_access(*vcpu_pc(vcpu), params, r);
+
+	/* Check for regs disabled by runtime config */
+	if (sysreg_hidden(vcpu, r)) {
+		kvm_inject_undefined(vcpu);
+		return;
+	}
+
+	/*
+	 * Not having an accessor means that we have configured a trap
+	 * that we don't know how to handle. This certainly qualifies
+	 * as a gross bug that should be fixed right away.
+	 */
+	BUG_ON(!r->access);
+
+	/* Skip instruction if instructed so */
+	if (likely(r->access(vcpu, params, r)))
+		kvm_incr_pc(vcpu);
+}
+
+/*
+ * emulate_cp --  tries to match a sys_reg access in a handling table, and
+ *                call the corresponding trap handler.
+ *
+ * @params: pointer to the descriptor of the access
+ * @table: array of trap descriptors
+ * @num: size of the trap descriptor array
+ *
+ * Return true if the access has been handled, false if not.
+ */
+static bool emulate_cp(struct kvm_vcpu *vcpu,
+		       struct sys_reg_params *params,
+		       const struct sys_reg_desc *table,
+		       size_t num)
+{
+	const struct sys_reg_desc *r;
+
+	if (!table)
+		return false;	/* Not handled */
+
+	r = find_reg(params, table, num);
+
+	if (r) {
+		perform_access(vcpu, params, r);
+		return true;
+	}
+
+	/* Not handled */
+	return false;
+}
+
+static void unhandled_cp_access(struct kvm_vcpu *vcpu,
+				struct sys_reg_params *params)
+{
+	u8 esr_ec = kvm_vcpu_trap_get_class(vcpu);
+	int cp = -1;
+
+	switch (esr_ec) {
+	case ESR_ELx_EC_CP15_32:
+	case ESR_ELx_EC_CP15_64:
+		cp = 15;
+		break;
+	case ESR_ELx_EC_CP14_MR:
+	case ESR_ELx_EC_CP14_64:
+		cp = 14;
+		break;
+	default:
+		WARN_ON(1);
+	}
+
+	print_sys_reg_msg(params,
+			  "Unsupported guest CP%d access at: %08lx [%08lx]\n",
+			  cp, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
+	kvm_inject_undefined(vcpu);
+}
+
+/**
+ * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
+			    const struct sys_reg_desc *global,
+			    size_t nr_global)
+{
+	struct sys_reg_params params;
+	u64 esr = kvm_vcpu_get_esr(vcpu);
+	int Rt = kvm_vcpu_sys_get_rt(vcpu);
+	int Rt2 = (esr >> 10) & 0x1f;
+
+	params.CRm = (esr >> 1) & 0xf;
+	params.is_write = ((esr & 1) == 0);
+
+	params.Op0 = 0;
+	params.Op1 = (esr >> 16) & 0xf;
+	params.Op2 = 0;
+	params.CRn = 0;
+
+	/*
+	 * Make a 64-bit value out of Rt and Rt2. As we use the same trap
+	 * backends between AArch32 and AArch64, we get away with it.
+	 */
+	if (params.is_write) {
+		params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff;
+		params.regval |= vcpu_get_reg(vcpu, Rt2) << 32;
+	}
+
+	/*
+	 * If the table contains a handler, handle the
+	 * potential register operation in the case of a read and return
+	 * with success.
+	 */
+	if (emulate_cp(vcpu, &params, global, nr_global)) {
+		/* Split up the value between registers for the read side */
+		if (!params.is_write) {
+			vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
+			vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval));
+		}
+
+		return 1;
+	}
+
+	unhandled_cp_access(vcpu, &params);
+	return 1;
+}
+
+static bool emulate_sys_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *params);
+
+/*
+ * The CP10 ID registers are architecturally mapped to AArch64 feature
+ * registers. Abuse that fact so we can rely on the AArch64 handler for accesses
+ * from AArch32.
+ */
+static bool kvm_esr_cp10_id_to_sys64(u64 esr, struct sys_reg_params *params)
+{
+	u8 reg_id = (esr >> 10) & 0xf;
+	bool valid;
+
+	params->is_write = ((esr & 1) == 0);
+	params->Op0 = 3;
+	params->Op1 = 0;
+	params->CRn = 0;
+	params->CRm = 3;
+
+	/* CP10 ID registers are read-only */
+	valid = !params->is_write;
+
+	switch (reg_id) {
+	/* MVFR0 */
+	case 0b0111:
+		params->Op2 = 0;
+		break;
+	/* MVFR1 */
+	case 0b0110:
+		params->Op2 = 1;
+		break;
+	/* MVFR2 */
+	case 0b0101:
+		params->Op2 = 2;
+		break;
+	default:
+		valid = false;
+	}
+
+	if (valid)
+		return true;
+
+	kvm_pr_unimpl("Unhandled cp10 register %s: %u\n",
+		      params->is_write ? "write" : "read", reg_id);
+	return false;
+}
+
+/**
+ * kvm_handle_cp10_id() - Handles a VMRS trap on guest access to a 'Media and
+ *			  VFP Register' from AArch32.
+ * @vcpu: The vCPU pointer
+ *
+ * MVFR{0-2} are architecturally mapped to the AArch64 MVFR{0-2}_EL1 registers.
+ * Work out the correct AArch64 system register encoding and reroute to the
+ * AArch64 system register emulation.
+ */
+int kvm_handle_cp10_id(struct kvm_vcpu *vcpu)
+{
+	int Rt = kvm_vcpu_sys_get_rt(vcpu);
+	u64 esr = kvm_vcpu_get_esr(vcpu);
+	struct sys_reg_params params;
+
+	/* UNDEF on any unhandled register access */
+	if (!kvm_esr_cp10_id_to_sys64(esr, &params)) {
+		kvm_inject_undefined(vcpu);
+		return 1;
+	}
+
+	if (emulate_sys_reg(vcpu, &params))
+		vcpu_set_reg(vcpu, Rt, params.regval);
+
+	return 1;
+}
+
+/**
+ * kvm_emulate_cp15_id_reg() - Handles an MRC trap on a guest CP15 access where
+ *			       CRn=0, which corresponds to the AArch32 feature
+ *			       registers.
+ * @vcpu: the vCPU pointer
+ * @params: the system register access parameters.
+ *
+ * Our cp15 system register tables do not enumerate the AArch32 feature
+ * registers. Conveniently, our AArch64 table does, and the AArch32 system
+ * register encoding can be trivially remapped into the AArch64 for the feature
+ * registers: Append op0=3, leaving op1, CRn, CRm, and op2 the same.
+ *
+ * According to DDI0487G.b G7.3.1, paragraph "Behavior of VMSAv8-32 32-bit
+ * System registers with (coproc=0b1111, CRn==c0)", read accesses from this
+ * range are either UNKNOWN or RES0. Rerouting remains architectural as we
+ * treat undefined registers in this range as RAZ.
+ */
+static int kvm_emulate_cp15_id_reg(struct kvm_vcpu *vcpu,
+				   struct sys_reg_params *params)
+{
+	int Rt = kvm_vcpu_sys_get_rt(vcpu);
+
+	/* Treat impossible writes to RO registers as UNDEFINED */
+	if (params->is_write) {
+		unhandled_cp_access(vcpu, params);
+		return 1;
+	}
+
+	params->Op0 = 3;
+
+	/*
+	 * All registers where CRm > 3 are known to be UNKNOWN/RAZ from AArch32.
+	 * Avoid conflicting with future expansion of AArch64 feature registers
+	 * and simply treat them as RAZ here.
+	 */
+	if (params->CRm > 3)
+		params->regval = 0;
+	else if (!emulate_sys_reg(vcpu, params))
+		return 1;
+
+	vcpu_set_reg(vcpu, Rt, params->regval);
+	return 1;
+}
+
+/**
+ * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access
+ * @vcpu: The VCPU pointer
+ * @run:  The kvm_run struct
+ */
+static int kvm_handle_cp_32(struct kvm_vcpu *vcpu,
+			    struct sys_reg_params *params,
+			    const struct sys_reg_desc *global,
+			    size_t nr_global)
+{
+	int Rt  = kvm_vcpu_sys_get_rt(vcpu);
+
+	params->regval = vcpu_get_reg(vcpu, Rt);
+
+	if (emulate_cp(vcpu, params, global, nr_global)) {
+		if (!params->is_write)
+			vcpu_set_reg(vcpu, Rt, params->regval);
+		return 1;
+	}
+
+	unhandled_cp_access(vcpu, params);
+	return 1;
+}
+
+int kvm_handle_cp15_64(struct kvm_vcpu *vcpu)
+{
+	return kvm_handle_cp_64(vcpu, cp15_64_regs, ARRAY_SIZE(cp15_64_regs));
+}
+
+int kvm_handle_cp15_32(struct kvm_vcpu *vcpu)
+{
+	struct sys_reg_params params;
+
+	params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu));
+
+	/*
+	 * Certain AArch32 ID registers are handled by rerouting to the AArch64
+	 * system register table. Registers in the ID range where CRm=0 are
+	 * excluded from this scheme as they do not trivially map into AArch64
+	 * system register encodings.
+	 */
+	if (params.Op1 == 0 && params.CRn == 0 && params.CRm)
+		return kvm_emulate_cp15_id_reg(vcpu, &params);
+
+	return kvm_handle_cp_32(vcpu, &params, cp15_regs, ARRAY_SIZE(cp15_regs));
+}
+
+int kvm_handle_cp14_64(struct kvm_vcpu *vcpu)
+{
+	return kvm_handle_cp_64(vcpu, cp14_64_regs, ARRAY_SIZE(cp14_64_regs));
+}
+
+int kvm_handle_cp14_32(struct kvm_vcpu *vcpu)
+{
+	struct sys_reg_params params;
+
+	params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu));
+
+	return kvm_handle_cp_32(vcpu, &params, cp14_regs, ARRAY_SIZE(cp14_regs));
+}
+
+static bool is_imp_def_sys_reg(struct sys_reg_params *params)
+{
+	// See ARM DDI 0487E.a, section D12.3.2
+	return params->Op0 == 3 && (params->CRn & 0b1011) == 0b1011;
+}
+
+/**
+ * emulate_sys_reg - Emulate a guest access to an AArch64 system register
+ * @vcpu: The VCPU pointer
+ * @params: Decoded system register parameters
+ *
+ * Return: true if the system register access was successful, false otherwise.
+ */
+static bool emulate_sys_reg(struct kvm_vcpu *vcpu,
+			   struct sys_reg_params *params)
+{
+	const struct sys_reg_desc *r;
+
+	r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
+
+	if (likely(r)) {
+		perform_access(vcpu, params, r);
+		return true;
+	}
+
+	if (is_imp_def_sys_reg(params)) {
+		kvm_inject_undefined(vcpu);
+	} else {
+		print_sys_reg_msg(params,
+				  "Unsupported guest sys_reg access at: %lx [%08lx]\n",
+				  *vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
+		kvm_inject_undefined(vcpu);
+	}
+	return false;
+}
+
+/**
+ * kvm_reset_sys_regs - sets system registers to reset value
+ * @vcpu: The VCPU pointer
+ *
+ * This function finds the right table above and sets the registers on the
+ * virtual CPU struct to their architecturally defined reset values.
+ */
+void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
+{
+	unsigned long i;
+
+	for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++)
+		if (sys_reg_descs[i].reset)
+			sys_reg_descs[i].reset(vcpu, &sys_reg_descs[i]);
+}
+
+/**
+ * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access
+ * @vcpu: The VCPU pointer
+ */
+int kvm_handle_sys_reg(struct kvm_vcpu *vcpu)
+{
+	struct sys_reg_params params;
+	unsigned long esr = kvm_vcpu_get_esr(vcpu);
+	int Rt = kvm_vcpu_sys_get_rt(vcpu);
+
+	trace_kvm_handle_sys_reg(esr);
+
+	params = esr_sys64_to_params(esr);
+	params.regval = vcpu_get_reg(vcpu, Rt);
+
+	if (!emulate_sys_reg(vcpu, &params))
+		return 1;
+
+	if (!params.is_write)
+		vcpu_set_reg(vcpu, Rt, params.regval);
+	return 1;
+}
+
+/******************************************************************************
+ * Userspace API
+ *****************************************************************************/
+
+static bool index_to_params(u64 id, struct sys_reg_params *params)
+{
+	switch (id & KVM_REG_SIZE_MASK) {
+	case KVM_REG_SIZE_U64:
+		/* Any unused index bits means it's not valid. */
+		if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK
+			      | KVM_REG_ARM_COPROC_MASK
+			      | KVM_REG_ARM64_SYSREG_OP0_MASK
+			      | KVM_REG_ARM64_SYSREG_OP1_MASK
+			      | KVM_REG_ARM64_SYSREG_CRN_MASK
+			      | KVM_REG_ARM64_SYSREG_CRM_MASK
+			      | KVM_REG_ARM64_SYSREG_OP2_MASK))
+			return false;
+		params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK)
+			       >> KVM_REG_ARM64_SYSREG_OP0_SHIFT);
+		params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK)
+			       >> KVM_REG_ARM64_SYSREG_OP1_SHIFT);
+		params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK)
+			       >> KVM_REG_ARM64_SYSREG_CRN_SHIFT);
+		params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK)
+			       >> KVM_REG_ARM64_SYSREG_CRM_SHIFT);
+		params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK)
+			       >> KVM_REG_ARM64_SYSREG_OP2_SHIFT);
+		return true;
+	default:
+		return false;
+	}
+}
+
+const struct sys_reg_desc *get_reg_by_id(u64 id,
+					 const struct sys_reg_desc table[],
+					 unsigned int num)
+{
+	struct sys_reg_params params;
+
+	if (!index_to_params(id, &params))
+		return NULL;
+
+	return find_reg(&params, table, num);
+}
+
+/* Decode an index value, and find the sys_reg_desc entry. */
+static const struct sys_reg_desc *
+id_to_sys_reg_desc(struct kvm_vcpu *vcpu, u64 id,
+		   const struct sys_reg_desc table[], unsigned int num)
+
+{
+	const struct sys_reg_desc *r;
+
+	/* We only do sys_reg for now. */
+	if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG)
+		return NULL;
+
+	r = get_reg_by_id(id, table, num);
+
+	/* Not saved in the sys_reg array and not otherwise accessible? */
+	if (r && (!(r->reg || r->get_user) || sysreg_hidden(vcpu, r)))
+		r = NULL;
+
+	return r;
+}
+
+/*
+ * These are the invariant sys_reg registers: we let the guest see the
+ * host versions of these, so they're part of the guest state.
+ *
+ * A future CPU may provide a mechanism to present different values to
+ * the guest, or a future kvm may trap them.
+ */
+
+#define FUNCTION_INVARIANT(reg)						\
+	static void get_##reg(struct kvm_vcpu *v,			\
+			      const struct sys_reg_desc *r)		\
+	{								\
+		((struct sys_reg_desc *)r)->val = read_sysreg(reg);	\
+	}
+
+FUNCTION_INVARIANT(midr_el1)
+FUNCTION_INVARIANT(revidr_el1)
+FUNCTION_INVARIANT(clidr_el1)
+FUNCTION_INVARIANT(aidr_el1)
+
+static void get_ctr_el0(struct kvm_vcpu *v, const struct sys_reg_desc *r)
+{
+	((struct sys_reg_desc *)r)->val = read_sanitised_ftr_reg(SYS_CTR_EL0);
+}
+
+/* ->val is filled in by kvm_sys_reg_table_init() */
+static struct sys_reg_desc invariant_sys_regs[] = {
+	{ SYS_DESC(SYS_MIDR_EL1), NULL, get_midr_el1 },
+	{ SYS_DESC(SYS_REVIDR_EL1), NULL, get_revidr_el1 },
+	{ SYS_DESC(SYS_CLIDR_EL1), NULL, get_clidr_el1 },
+	{ SYS_DESC(SYS_AIDR_EL1), NULL, get_aidr_el1 },
+	{ SYS_DESC(SYS_CTR_EL0), NULL, get_ctr_el0 },
+};
+
+static int get_invariant_sys_reg(u64 id, u64 __user *uaddr)
+{
+	const struct sys_reg_desc *r;
+
+	r = get_reg_by_id(id, invariant_sys_regs,
+			  ARRAY_SIZE(invariant_sys_regs));
+	if (!r)
+		return -ENOENT;
+
+	return put_user(r->val, uaddr);
+}
+
+static int set_invariant_sys_reg(u64 id, u64 __user *uaddr)
+{
+	const struct sys_reg_desc *r;
+	u64 val;
+
+	r = get_reg_by_id(id, invariant_sys_regs,
+			  ARRAY_SIZE(invariant_sys_regs));
+	if (!r)
+		return -ENOENT;
+
+	if (get_user(val, uaddr))
+		return -EFAULT;
+
+	/* This is what we mean by invariant: you can't change it. */
+	if (r->val != val)
+		return -EINVAL;
+
+	return 0;
+}
+
+static bool is_valid_cache(u32 val)
+{
+	u32 level, ctype;
+
+	if (val >= CSSELR_MAX)
+		return false;
+
+	/* Bottom bit is Instruction or Data bit.  Next 3 bits are level. */
+	level = (val >> 1);
+	ctype = (cache_levels >> (level * 3)) & 7;
+
+	switch (ctype) {
+	case 0: /* No cache */
+		return false;
+	case 1: /* Instruction cache only */
+		return (val & 1);
+	case 2: /* Data cache only */
+	case 4: /* Unified cache */
+		return !(val & 1);
+	case 3: /* Separate instruction and data caches */
+		return true;
+	default: /* Reserved: we can't know instruction or data. */
+		return false;
+	}
+}
+
+static int demux_c15_get(u64 id, void __user *uaddr)
+{
+	u32 val;
+	u32 __user *uval = uaddr;
+
+	/* Fail if we have unknown bits set. */
+	if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
+		   | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
+		return -ENOENT;
+
+	switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
+	case KVM_REG_ARM_DEMUX_ID_CCSIDR:
+		if (KVM_REG_SIZE(id) != 4)
+			return -ENOENT;
+		val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
+			>> KVM_REG_ARM_DEMUX_VAL_SHIFT;
+		if (!is_valid_cache(val))
+			return -ENOENT;
+
+		return put_user(get_ccsidr(val), uval);
+	default:
+		return -ENOENT;
+	}
+}
+
+static int demux_c15_set(u64 id, void __user *uaddr)
+{
+	u32 val, newval;
+	u32 __user *uval = uaddr;
+
+	/* Fail if we have unknown bits set. */
+	if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
+		   | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
+		return -ENOENT;
+
+	switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
+	case KVM_REG_ARM_DEMUX_ID_CCSIDR:
+		if (KVM_REG_SIZE(id) != 4)
+			return -ENOENT;
+		val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
+			>> KVM_REG_ARM_DEMUX_VAL_SHIFT;
+		if (!is_valid_cache(val))
+			return -ENOENT;
+
+		if (get_user(newval, uval))
+			return -EFAULT;
+
+		/* This is also invariant: you can't change it. */
+		if (newval != get_ccsidr(val))
+			return -EINVAL;
+		return 0;
+	default:
+		return -ENOENT;
+	}
+}
+
+int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
+			 const struct sys_reg_desc table[], unsigned int num)
+{
+	u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr;
+	const struct sys_reg_desc *r;
+	u64 val;
+	int ret;
+
+	r = id_to_sys_reg_desc(vcpu, reg->id, table, num);
+	if (!r)
+		return -ENOENT;
+
+	if (r->get_user) {
+		ret = (r->get_user)(vcpu, r, &val);
+	} else {
+		val = __vcpu_sys_reg(vcpu, r->reg);
+		ret = 0;
+	}
+
+	if (!ret)
+		ret = put_user(val, uaddr);
+
+	return ret;
+}
+
+int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	void __user *uaddr = (void __user *)(unsigned long)reg->addr;
+	int err;
+
+	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
+		return demux_c15_get(reg->id, uaddr);
+
+	err = get_invariant_sys_reg(reg->id, uaddr);
+	if (err != -ENOENT)
+		return err;
+
+	return kvm_sys_reg_get_user(vcpu, reg,
+				    sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
+}
+
+int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
+			 const struct sys_reg_desc table[], unsigned int num)
+{
+	u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr;
+	const struct sys_reg_desc *r;
+	u64 val;
+	int ret;
+
+	if (get_user(val, uaddr))
+		return -EFAULT;
+
+	r = id_to_sys_reg_desc(vcpu, reg->id, table, num);
+	if (!r)
+		return -ENOENT;
+
+	if (sysreg_user_write_ignore(vcpu, r))
+		return 0;
+
+	if (r->set_user) {
+		ret = (r->set_user)(vcpu, r, val);
+	} else {
+		__vcpu_sys_reg(vcpu, r->reg) = val;
+		ret = 0;
+	}
+
+	return ret;
+}
+
+int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+	void __user *uaddr = (void __user *)(unsigned long)reg->addr;
+	int err;
+
+	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
+		return demux_c15_set(reg->id, uaddr);
+
+	err = set_invariant_sys_reg(reg->id, uaddr);
+	if (err != -ENOENT)
+		return err;
+
+	return kvm_sys_reg_set_user(vcpu, reg,
+				    sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
+}
+
+static unsigned int num_demux_regs(void)
+{
+	unsigned int i, count = 0;
+
+	for (i = 0; i < CSSELR_MAX; i++)
+		if (is_valid_cache(i))
+			count++;
+
+	return count;
+}
+
+static int write_demux_regids(u64 __user *uindices)
+{
+	u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX;
+	unsigned int i;
+
+	val |= KVM_REG_ARM_DEMUX_ID_CCSIDR;
+	for (i = 0; i < CSSELR_MAX; i++) {
+		if (!is_valid_cache(i))
+			continue;
+		if (put_user(val | i, uindices))
+			return -EFAULT;
+		uindices++;
+	}
+	return 0;
+}
+
+static u64 sys_reg_to_index(const struct sys_reg_desc *reg)
+{
+	return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 |
+		KVM_REG_ARM64_SYSREG |
+		(reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) |
+		(reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) |
+		(reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) |
+		(reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) |
+		(reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT));
+}
+
+static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind)
+{
+	if (!*uind)
+		return true;
+
+	if (put_user(sys_reg_to_index(reg), *uind))
+		return false;
+
+	(*uind)++;
+	return true;
+}
+
+static int walk_one_sys_reg(const struct kvm_vcpu *vcpu,
+			    const struct sys_reg_desc *rd,
+			    u64 __user **uind,
+			    unsigned int *total)
+{
+	/*
+	 * Ignore registers we trap but don't save,
+	 * and for which no custom user accessor is provided.
+	 */
+	if (!(rd->reg || rd->get_user))
+		return 0;
+
+	if (sysreg_hidden(vcpu, rd))
+		return 0;
+
+	if (!copy_reg_to_user(rd, uind))
+		return -EFAULT;
+
+	(*total)++;
+	return 0;
+}
+
+/* Assumed ordered tables, see kvm_sys_reg_table_init. */
+static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind)
+{
+	const struct sys_reg_desc *i2, *end2;
+	unsigned int total = 0;
+	int err;
+
+	i2 = sys_reg_descs;
+	end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs);
+
+	while (i2 != end2) {
+		err = walk_one_sys_reg(vcpu, i2++, &uind, &total);
+		if (err)
+			return err;
+	}
+	return total;
+}
+
+unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu)
+{
+	return ARRAY_SIZE(invariant_sys_regs)
+		+ num_demux_regs()
+		+ walk_sys_regs(vcpu, (u64 __user *)NULL);
+}
+
+int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
+{
+	unsigned int i;
+	int err;
+
+	/* Then give them all the invariant registers' indices. */
+	for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) {
+		if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices))
+			return -EFAULT;
+		uindices++;
+	}
+
+	err = walk_sys_regs(vcpu, uindices);
+	if (err < 0)
+		return err;
+	uindices += err;
+
+	return write_demux_regids(uindices);
+}
+
+int kvm_sys_reg_table_init(void)
+{
+	bool valid = true;
+	unsigned int i;
+	struct sys_reg_desc clidr;
+
+	/* Make sure tables are unique and in order. */
+	valid &= check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs), false);
+	valid &= check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs), true);
+	valid &= check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs), true);
+	valid &= check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true);
+	valid &= check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true);
+	valid &= check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false);
+
+	if (!valid)
+		return -EINVAL;
+
+	/* We abuse the reset function to overwrite the table itself. */
+	for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++)
+		invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]);
+
+	/*
+	 * CLIDR format is awkward, so clean it up.  See ARM B4.1.20:
+	 *
+	 *   If software reads the Cache Type fields from Ctype1
+	 *   upwards, once it has seen a value of 0b000, no caches
+	 *   exist at further-out levels of the hierarchy. So, for
+	 *   example, if Ctype3 is the first Cache Type field with a
+	 *   value of 0b000, the values of Ctype4 to Ctype7 must be
+	 *   ignored.
+	 */
+	get_clidr_el1(NULL, &clidr); /* Ugly... */
+	cache_levels = clidr.val;
+	for (i = 0; i < 7; i++)
+		if (((cache_levels >> (i*3)) & 7) == 0)
+			break;
+	/* Clear all higher bits. */
+	cache_levels &= (1 << (i*3))-1;
+
+	return 0;
+}
diff --git a/arch/arm64/kvm/sys_regs.h b/arch/arm64/kvm/sys_regs.h
new file mode 100644
index 000000000..e4ebb3a37
--- /dev/null
+++ b/arch/arm64/kvm/sys_regs.h
@@ -0,0 +1,227 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/coproc.h
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Authors: Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
+#define __ARM64_KVM_SYS_REGS_LOCAL_H__
+
+#include <linux/bsearch.h>
+
+#define reg_to_encoding(x)						\
+	sys_reg((u32)(x)->Op0, (u32)(x)->Op1,				\
+		(u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2)
+
+struct sys_reg_params {
+	u8	Op0;
+	u8	Op1;
+	u8	CRn;
+	u8	CRm;
+	u8	Op2;
+	u64	regval;
+	bool	is_write;
+};
+
+#define esr_sys64_to_params(esr)                                               \
+	((struct sys_reg_params){ .Op0 = ((esr) >> 20) & 3,                    \
+				  .Op1 = ((esr) >> 14) & 0x7,                  \
+				  .CRn = ((esr) >> 10) & 0xf,                  \
+				  .CRm = ((esr) >> 1) & 0xf,                   \
+				  .Op2 = ((esr) >> 17) & 0x7,                  \
+				  .is_write = !((esr) & 1) })
+
+#define esr_cp1x_32_to_params(esr)						\
+	((struct sys_reg_params){ .Op1 = ((esr) >> 14) & 0x7,			\
+				  .CRn = ((esr) >> 10) & 0xf,			\
+				  .CRm = ((esr) >> 1) & 0xf,			\
+				  .Op2 = ((esr) >> 17) & 0x7,			\
+				  .is_write = !((esr) & 1) })
+
+struct sys_reg_desc {
+	/* Sysreg string for debug */
+	const char *name;
+
+	enum {
+		AA32_DIRECT,
+		AA32_LO,
+		AA32_HI,
+	} aarch32_map;
+
+	/* MRS/MSR instruction which accesses it. */
+	u8	Op0;
+	u8	Op1;
+	u8	CRn;
+	u8	CRm;
+	u8	Op2;
+
+	/* Trapped access from guest, if non-NULL. */
+	bool (*access)(struct kvm_vcpu *,
+		       struct sys_reg_params *,
+		       const struct sys_reg_desc *);
+
+	/* Initialization for vcpu. */
+	void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);
+
+	/* Index into sys_reg[], or 0 if we don't need to save it. */
+	int reg;
+
+	/* Value (usually reset value) */
+	u64 val;
+
+	/* Custom get/set_user functions, fallback to generic if NULL */
+	int (*get_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+			u64 *val);
+	int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+			u64 val);
+
+	/* Return mask of REG_* runtime visibility overrides */
+	unsigned int (*visibility)(const struct kvm_vcpu *vcpu,
+				   const struct sys_reg_desc *rd);
+};
+
+#define REG_HIDDEN		(1 << 0) /* hidden from userspace and guest */
+#define REG_RAZ			(1 << 1) /* RAZ from userspace and guest */
+#define REG_USER_WI		(1 << 2) /* WI from userspace only */
+
+static __printf(2, 3)
+inline void print_sys_reg_msg(const struct sys_reg_params *p,
+				       char *fmt, ...)
+{
+	va_list va;
+
+	va_start(va, fmt);
+	/* Look, we even formatted it for you to paste into the table! */
+	kvm_pr_unimpl("%pV { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
+		      &(struct va_format){ fmt, &va },
+		      p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
+	va_end(va);
+}
+
+static inline void print_sys_reg_instr(const struct sys_reg_params *p)
+{
+	/* GCC warns on an empty format string */
+	print_sys_reg_msg(p, "%s", "");
+}
+
+static inline bool ignore_write(struct kvm_vcpu *vcpu,
+				const struct sys_reg_params *p)
+{
+	return true;
+}
+
+static inline bool read_zero(struct kvm_vcpu *vcpu,
+			     struct sys_reg_params *p)
+{
+	p->regval = 0;
+	return true;
+}
+
+/* Reset functions */
+static inline void reset_unknown(struct kvm_vcpu *vcpu,
+				 const struct sys_reg_desc *r)
+{
+	BUG_ON(!r->reg);
+	BUG_ON(r->reg >= NR_SYS_REGS);
+	__vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
+}
+
+static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+	BUG_ON(!r->reg);
+	BUG_ON(r->reg >= NR_SYS_REGS);
+	__vcpu_sys_reg(vcpu, r->reg) = r->val;
+}
+
+static inline unsigned int sysreg_visibility(const struct kvm_vcpu *vcpu,
+					     const struct sys_reg_desc *r)
+{
+	if (likely(!r->visibility))
+		return 0;
+
+	return r->visibility(vcpu, r);
+}
+
+static inline bool sysreg_hidden(const struct kvm_vcpu *vcpu,
+				 const struct sys_reg_desc *r)
+{
+	return sysreg_visibility(vcpu, r) & REG_HIDDEN;
+}
+
+static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu,
+					 const struct sys_reg_desc *r)
+{
+	return sysreg_visibility(vcpu, r) & REG_RAZ;
+}
+
+static inline bool sysreg_user_write_ignore(const struct kvm_vcpu *vcpu,
+					    const struct sys_reg_desc *r)
+{
+	return sysreg_visibility(vcpu, r) & REG_USER_WI;
+}
+
+static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
+			      const struct sys_reg_desc *i2)
+{
+	BUG_ON(i1 == i2);
+	if (!i1)
+		return 1;
+	else if (!i2)
+		return -1;
+	if (i1->Op0 != i2->Op0)
+		return i1->Op0 - i2->Op0;
+	if (i1->Op1 != i2->Op1)
+		return i1->Op1 - i2->Op1;
+	if (i1->CRn != i2->CRn)
+		return i1->CRn - i2->CRn;
+	if (i1->CRm != i2->CRm)
+		return i1->CRm - i2->CRm;
+	return i1->Op2 - i2->Op2;
+}
+
+static inline int match_sys_reg(const void *key, const void *elt)
+{
+	const unsigned long pval = (unsigned long)key;
+	const struct sys_reg_desc *r = elt;
+
+	return pval - reg_to_encoding(r);
+}
+
+static inline const struct sys_reg_desc *
+find_reg(const struct sys_reg_params *params, const struct sys_reg_desc table[],
+	 unsigned int num)
+{
+	unsigned long pval = reg_to_encoding(params);
+
+	return __inline_bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg);
+}
+
+const struct sys_reg_desc *get_reg_by_id(u64 id,
+					 const struct sys_reg_desc table[],
+					 unsigned int num);
+
+int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
+int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
+int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
+			 const struct sys_reg_desc table[], unsigned int num);
+int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
+			 const struct sys_reg_desc table[], unsigned int num);
+
+#define AA32(_x)	.aarch32_map = AA32_##_x
+#define Op0(_x) 	.Op0 = _x
+#define Op1(_x) 	.Op1 = _x
+#define CRn(_x)		.CRn = _x
+#define CRm(_x) 	.CRm = _x
+#define Op2(_x) 	.Op2 = _x
+
+#define SYS_DESC(reg)					\
+	.name = #reg,					\
+	Op0(sys_reg_Op0(reg)), Op1(sys_reg_Op1(reg)),	\
+	CRn(sys_reg_CRn(reg)), CRm(sys_reg_CRm(reg)),	\
+	Op2(sys_reg_Op2(reg))
+
+#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */
diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h
new file mode 100644
index 000000000..86f9ea47b
--- /dev/null
+++ b/arch/arm64/kvm/trace.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _TRACE_ARM64_KVM_H
+#define _TRACE_ARM64_KVM_H
+
+#include "trace_arm.h"
+#include "trace_handle_exit.h"
+
+#endif	/* _TRACE_ARM64_KVM_H */
diff --git a/arch/arm64/kvm/trace_arm.h b/arch/arm64/kvm/trace_arm.h
new file mode 100644
index 000000000..33e4e7dd2
--- /dev/null
+++ b/arch/arm64/kvm/trace_arm.h
@@ -0,0 +1,312 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#if !defined(_TRACE_ARM_ARM64_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_ARM_ARM64_KVM_H
+
+#include <kvm/arm_arch_timer.h>
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+
+/*
+ * Tracepoints for entry/exit to guest
+ */
+TRACE_EVENT(kvm_entry,
+	TP_PROTO(unsigned long vcpu_pc),
+	TP_ARGS(vcpu_pc),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,	vcpu_pc		)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_pc		= vcpu_pc;
+	),
+
+	TP_printk("PC: 0x%016lx", __entry->vcpu_pc)
+);
+
+TRACE_EVENT(kvm_exit,
+	TP_PROTO(int ret, unsigned int esr_ec, unsigned long vcpu_pc),
+	TP_ARGS(ret, esr_ec, vcpu_pc),
+
+	TP_STRUCT__entry(
+		__field(	int,		ret		)
+		__field(	unsigned int,	esr_ec		)
+		__field(	unsigned long,	vcpu_pc		)
+	),
+
+	TP_fast_assign(
+		__entry->ret			= ARM_EXCEPTION_CODE(ret);
+		__entry->esr_ec = ARM_EXCEPTION_IS_TRAP(ret) ? esr_ec : 0;
+		__entry->vcpu_pc		= vcpu_pc;
+	),
+
+	TP_printk("%s: HSR_EC: 0x%04x (%s), PC: 0x%016lx",
+		  __print_symbolic(__entry->ret, kvm_arm_exception_type),
+		  __entry->esr_ec,
+		  __print_symbolic(__entry->esr_ec, kvm_arm_exception_class),
+		  __entry->vcpu_pc)
+);
+
+TRACE_EVENT(kvm_guest_fault,
+	TP_PROTO(unsigned long vcpu_pc, unsigned long hsr,
+		 unsigned long hxfar,
+		 unsigned long long ipa),
+	TP_ARGS(vcpu_pc, hsr, hxfar, ipa),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,	vcpu_pc		)
+		__field(	unsigned long,	hsr		)
+		__field(	unsigned long,	hxfar		)
+		__field(   unsigned long long,	ipa		)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_pc		= vcpu_pc;
+		__entry->hsr			= hsr;
+		__entry->hxfar			= hxfar;
+		__entry->ipa			= ipa;
+	),
+
+	TP_printk("ipa %#llx, hsr %#08lx, hxfar %#08lx, pc %#016lx",
+		  __entry->ipa, __entry->hsr,
+		  __entry->hxfar, __entry->vcpu_pc)
+);
+
+TRACE_EVENT(kvm_access_fault,
+	TP_PROTO(unsigned long ipa),
+	TP_ARGS(ipa),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,	ipa		)
+	),
+
+	TP_fast_assign(
+		__entry->ipa		= ipa;
+	),
+
+	TP_printk("IPA: %lx", __entry->ipa)
+);
+
+TRACE_EVENT(kvm_irq_line,
+	TP_PROTO(unsigned int type, int vcpu_idx, int irq_num, int level),
+	TP_ARGS(type, vcpu_idx, irq_num, level),
+
+	TP_STRUCT__entry(
+		__field(	unsigned int,	type		)
+		__field(	int,		vcpu_idx	)
+		__field(	int,		irq_num		)
+		__field(	int,		level		)
+	),
+
+	TP_fast_assign(
+		__entry->type		= type;
+		__entry->vcpu_idx	= vcpu_idx;
+		__entry->irq_num	= irq_num;
+		__entry->level		= level;
+	),
+
+	TP_printk("Inject %s interrupt (%d), vcpu->idx: %d, num: %d, level: %d",
+		  (__entry->type == KVM_ARM_IRQ_TYPE_CPU) ? "CPU" :
+		  (__entry->type == KVM_ARM_IRQ_TYPE_PPI) ? "VGIC PPI" :
+		  (__entry->type == KVM_ARM_IRQ_TYPE_SPI) ? "VGIC SPI" : "UNKNOWN",
+		  __entry->type, __entry->vcpu_idx, __entry->irq_num, __entry->level)
+);
+
+TRACE_EVENT(kvm_mmio_emulate,
+	TP_PROTO(unsigned long vcpu_pc, unsigned long instr,
+		 unsigned long cpsr),
+	TP_ARGS(vcpu_pc, instr, cpsr),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,	vcpu_pc		)
+		__field(	unsigned long,	instr		)
+		__field(	unsigned long,	cpsr		)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_pc		= vcpu_pc;
+		__entry->instr			= instr;
+		__entry->cpsr			= cpsr;
+	),
+
+	TP_printk("Emulate MMIO at: 0x%016lx (instr: %08lx, cpsr: %08lx)",
+		  __entry->vcpu_pc, __entry->instr, __entry->cpsr)
+);
+
+TRACE_EVENT(kvm_set_way_flush,
+	    TP_PROTO(unsigned long vcpu_pc, bool cache),
+	    TP_ARGS(vcpu_pc, cache),
+
+	    TP_STRUCT__entry(
+		    __field(	unsigned long,	vcpu_pc		)
+		    __field(	bool,		cache		)
+	    ),
+
+	    TP_fast_assign(
+		    __entry->vcpu_pc		= vcpu_pc;
+		    __entry->cache		= cache;
+	    ),
+
+	    TP_printk("S/W flush at 0x%016lx (cache %s)",
+		      __entry->vcpu_pc, __entry->cache ? "on" : "off")
+);
+
+TRACE_EVENT(kvm_toggle_cache,
+	    TP_PROTO(unsigned long vcpu_pc, bool was, bool now),
+	    TP_ARGS(vcpu_pc, was, now),
+
+	    TP_STRUCT__entry(
+		    __field(	unsigned long,	vcpu_pc		)
+		    __field(	bool,		was		)
+		    __field(	bool,		now		)
+	    ),
+
+	    TP_fast_assign(
+		    __entry->vcpu_pc		= vcpu_pc;
+		    __entry->was		= was;
+		    __entry->now		= now;
+	    ),
+
+	    TP_printk("VM op at 0x%016lx (cache was %s, now %s)",
+		      __entry->vcpu_pc, __entry->was ? "on" : "off",
+		      __entry->now ? "on" : "off")
+);
+
+/*
+ * Tracepoints for arch_timer
+ */
+TRACE_EVENT(kvm_timer_update_irq,
+	TP_PROTO(unsigned long vcpu_id, __u32 irq, int level),
+	TP_ARGS(vcpu_id, irq, level),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,	vcpu_id	)
+		__field(	__u32,		irq	)
+		__field(	int,		level	)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_id	= vcpu_id;
+		__entry->irq		= irq;
+		__entry->level		= level;
+	),
+
+	TP_printk("VCPU: %ld, IRQ %d, level %d",
+		  __entry->vcpu_id, __entry->irq, __entry->level)
+);
+
+TRACE_EVENT(kvm_get_timer_map,
+	TP_PROTO(unsigned long vcpu_id, struct timer_map *map),
+	TP_ARGS(vcpu_id, map),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,		vcpu_id	)
+		__field(	int,			direct_vtimer	)
+		__field(	int,			direct_ptimer	)
+		__field(	int,			emul_ptimer	)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_id		= vcpu_id;
+		__entry->direct_vtimer		= arch_timer_ctx_index(map->direct_vtimer);
+		__entry->direct_ptimer =
+			(map->direct_ptimer) ? arch_timer_ctx_index(map->direct_ptimer) : -1;
+		__entry->emul_ptimer =
+			(map->emul_ptimer) ? arch_timer_ctx_index(map->emul_ptimer) : -1;
+	),
+
+	TP_printk("VCPU: %ld, dv: %d, dp: %d, ep: %d",
+		  __entry->vcpu_id,
+		  __entry->direct_vtimer,
+		  __entry->direct_ptimer,
+		  __entry->emul_ptimer)
+);
+
+TRACE_EVENT(kvm_timer_save_state,
+	TP_PROTO(struct arch_timer_context *ctx),
+	TP_ARGS(ctx),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,		ctl		)
+		__field(	unsigned long long,	cval		)
+		__field(	int,			timer_idx	)
+	),
+
+	TP_fast_assign(
+		__entry->ctl			= timer_get_ctl(ctx);
+		__entry->cval			= timer_get_cval(ctx);
+		__entry->timer_idx		= arch_timer_ctx_index(ctx);
+	),
+
+	TP_printk("   CTL: %#08lx CVAL: %#16llx arch_timer_ctx_index: %d",
+		  __entry->ctl,
+		  __entry->cval,
+		  __entry->timer_idx)
+);
+
+TRACE_EVENT(kvm_timer_restore_state,
+	TP_PROTO(struct arch_timer_context *ctx),
+	TP_ARGS(ctx),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,		ctl		)
+		__field(	unsigned long long,	cval		)
+		__field(	int,			timer_idx	)
+	),
+
+	TP_fast_assign(
+		__entry->ctl			= timer_get_ctl(ctx);
+		__entry->cval			= timer_get_cval(ctx);
+		__entry->timer_idx		= arch_timer_ctx_index(ctx);
+	),
+
+	TP_printk("CTL: %#08lx CVAL: %#16llx arch_timer_ctx_index: %d",
+		  __entry->ctl,
+		  __entry->cval,
+		  __entry->timer_idx)
+);
+
+TRACE_EVENT(kvm_timer_hrtimer_expire,
+	TP_PROTO(struct arch_timer_context *ctx),
+	TP_ARGS(ctx),
+
+	TP_STRUCT__entry(
+		__field(	int,			timer_idx	)
+	),
+
+	TP_fast_assign(
+		__entry->timer_idx		= arch_timer_ctx_index(ctx);
+	),
+
+	TP_printk("arch_timer_ctx_index: %d", __entry->timer_idx)
+);
+
+TRACE_EVENT(kvm_timer_emulate,
+	TP_PROTO(struct arch_timer_context *ctx, bool should_fire),
+	TP_ARGS(ctx, should_fire),
+
+	TP_STRUCT__entry(
+		__field(	int,			timer_idx	)
+		__field(	bool,			should_fire	)
+	),
+
+	TP_fast_assign(
+		__entry->timer_idx		= arch_timer_ctx_index(ctx);
+		__entry->should_fire		= should_fire;
+	),
+
+	TP_printk("arch_timer_ctx_index: %d (should_fire: %d)",
+		  __entry->timer_idx, __entry->should_fire)
+);
+
+#endif /* _TRACE_ARM_ARM64_KVM_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace_arm
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/arch/arm64/kvm/trace_handle_exit.h b/arch/arm64/kvm/trace_handle_exit.h
new file mode 100644
index 000000000..064a58c19
--- /dev/null
+++ b/arch/arm64/kvm/trace_handle_exit.h
@@ -0,0 +1,219 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#if !defined(_TRACE_HANDLE_EXIT_ARM64_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HANDLE_EXIT_ARM64_KVM_H
+
+#include <linux/tracepoint.h>
+#include "sys_regs.h"
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+
+TRACE_EVENT(kvm_wfx_arm64,
+	TP_PROTO(unsigned long vcpu_pc, bool is_wfe),
+	TP_ARGS(vcpu_pc, is_wfe),
+
+	TP_STRUCT__entry(
+		__field(unsigned long,	vcpu_pc)
+		__field(bool,		is_wfe)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_pc = vcpu_pc;
+		__entry->is_wfe  = is_wfe;
+	),
+
+	TP_printk("guest executed wf%c at: 0x%016lx",
+		  __entry->is_wfe ? 'e' : 'i', __entry->vcpu_pc)
+);
+
+TRACE_EVENT(kvm_hvc_arm64,
+	TP_PROTO(unsigned long vcpu_pc, unsigned long r0, unsigned long imm),
+	TP_ARGS(vcpu_pc, r0, imm),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, vcpu_pc)
+		__field(unsigned long, r0)
+		__field(unsigned long, imm)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_pc = vcpu_pc;
+		__entry->r0 = r0;
+		__entry->imm = imm;
+	),
+
+	TP_printk("HVC at 0x%016lx (r0: 0x%016lx, imm: 0x%lx)",
+		  __entry->vcpu_pc, __entry->r0, __entry->imm)
+);
+
+TRACE_EVENT(kvm_arm_setup_debug,
+	TP_PROTO(struct kvm_vcpu *vcpu, __u32 guest_debug),
+	TP_ARGS(vcpu, guest_debug),
+
+	TP_STRUCT__entry(
+		__field(struct kvm_vcpu *, vcpu)
+		__field(__u32, guest_debug)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu = vcpu;
+		__entry->guest_debug = guest_debug;
+	),
+
+	TP_printk("vcpu: %p, flags: 0x%08x", __entry->vcpu, __entry->guest_debug)
+);
+
+TRACE_EVENT(kvm_arm_clear_debug,
+	TP_PROTO(__u32 guest_debug),
+	TP_ARGS(guest_debug),
+
+	TP_STRUCT__entry(
+		__field(__u32, guest_debug)
+	),
+
+	TP_fast_assign(
+		__entry->guest_debug = guest_debug;
+	),
+
+	TP_printk("flags: 0x%08x", __entry->guest_debug)
+);
+
+/*
+ * The dreg32 name is a leftover from a distant past. This will really
+ * output a 64bit value...
+ */
+TRACE_EVENT(kvm_arm_set_dreg32,
+	TP_PROTO(const char *name, __u64 value),
+	TP_ARGS(name, value),
+
+	TP_STRUCT__entry(
+		__field(const char *, name)
+		__field(__u64, value)
+	),
+
+	TP_fast_assign(
+		__entry->name = name;
+		__entry->value = value;
+	),
+
+	TP_printk("%s: 0x%llx", __entry->name, __entry->value)
+);
+
+TRACE_DEFINE_SIZEOF(__u64);
+
+TRACE_EVENT(kvm_arm_set_regset,
+	TP_PROTO(const char *type, int len, __u64 *control, __u64 *value),
+	TP_ARGS(type, len, control, value),
+	TP_STRUCT__entry(
+		__field(const char *, name)
+		__field(int, len)
+		__array(u64, ctrls, 16)
+		__array(u64, values, 16)
+	),
+	TP_fast_assign(
+		__entry->name = type;
+		__entry->len = len;
+		memcpy(__entry->ctrls, control, len << 3);
+		memcpy(__entry->values, value, len << 3);
+	),
+	TP_printk("%d %s CTRL:%s VALUE:%s", __entry->len, __entry->name,
+		__print_array(__entry->ctrls, __entry->len, sizeof(__u64)),
+		__print_array(__entry->values, __entry->len, sizeof(__u64)))
+);
+
+TRACE_EVENT(trap_reg,
+	TP_PROTO(const char *fn, int reg, bool is_write, u64 write_value),
+	TP_ARGS(fn, reg, is_write, write_value),
+
+	TP_STRUCT__entry(
+		__field(const char *, fn)
+		__field(int, reg)
+		__field(bool, is_write)
+		__field(u64, write_value)
+	),
+
+	TP_fast_assign(
+		__entry->fn = fn;
+		__entry->reg = reg;
+		__entry->is_write = is_write;
+		__entry->write_value = write_value;
+	),
+
+	TP_printk("%s %s reg %d (0x%016llx)", __entry->fn,  __entry->is_write?"write to":"read from", __entry->reg, __entry->write_value)
+);
+
+TRACE_EVENT(kvm_handle_sys_reg,
+	TP_PROTO(unsigned long hsr),
+	TP_ARGS(hsr),
+
+	TP_STRUCT__entry(
+		__field(unsigned long,	hsr)
+	),
+
+	TP_fast_assign(
+		__entry->hsr = hsr;
+	),
+
+	TP_printk("HSR 0x%08lx", __entry->hsr)
+);
+
+TRACE_EVENT(kvm_sys_access,
+	TP_PROTO(unsigned long vcpu_pc, struct sys_reg_params *params, const struct sys_reg_desc *reg),
+	TP_ARGS(vcpu_pc, params, reg),
+
+	TP_STRUCT__entry(
+		__field(unsigned long,			vcpu_pc)
+		__field(bool,				is_write)
+		__field(const char *,			name)
+		__field(u8,				Op0)
+		__field(u8,				Op1)
+		__field(u8,				CRn)
+		__field(u8,				CRm)
+		__field(u8,				Op2)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_pc = vcpu_pc;
+		__entry->is_write = params->is_write;
+		__entry->name = reg->name;
+		__entry->Op0 = reg->Op0;
+		__entry->Op0 = reg->Op0;
+		__entry->Op1 = reg->Op1;
+		__entry->CRn = reg->CRn;
+		__entry->CRm = reg->CRm;
+		__entry->Op2 = reg->Op2;
+	),
+
+	TP_printk("PC: %lx %s (%d,%d,%d,%d,%d) %s",
+		  __entry->vcpu_pc, __entry->name ?: "UNKN",
+		  __entry->Op0, __entry->Op1, __entry->CRn,
+		  __entry->CRm, __entry->Op2,
+		  __entry->is_write ? "write" : "read")
+);
+
+TRACE_EVENT(kvm_set_guest_debug,
+	TP_PROTO(struct kvm_vcpu *vcpu, __u32 guest_debug),
+	TP_ARGS(vcpu, guest_debug),
+
+	TP_STRUCT__entry(
+		__field(struct kvm_vcpu *, vcpu)
+		__field(__u32, guest_debug)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu = vcpu;
+		__entry->guest_debug = guest_debug;
+	),
+
+	TP_printk("vcpu: %p, flags: 0x%08x", __entry->vcpu, __entry->guest_debug)
+);
+
+#endif /* _TRACE_HANDLE_EXIT_ARM64_KVM_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace_handle_exit
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/arch/arm64/kvm/trng.c b/arch/arm64/kvm/trng.c
new file mode 100644
index 000000000..99bdd7103
--- /dev/null
+++ b/arch/arm64/kvm/trng.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020 Arm Ltd.
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_emulate.h>
+
+#include <kvm/arm_hypercalls.h>
+
+#define ARM_SMCCC_TRNG_VERSION_1_0	0x10000UL
+
+/* Those values are deliberately separate from the generic SMCCC definitions. */
+#define TRNG_SUCCESS			0UL
+#define TRNG_NOT_SUPPORTED		((unsigned long)-1)
+#define TRNG_INVALID_PARAMETER		((unsigned long)-2)
+#define TRNG_NO_ENTROPY			((unsigned long)-3)
+
+#define TRNG_MAX_BITS64			192
+
+static const uuid_t arm_smc_trng_uuid __aligned(4) = UUID_INIT(
+	0x0d21e000, 0x4384, 0x11eb, 0x80, 0x70, 0x52, 0x44, 0x55, 0x4e, 0x5a, 0x4c);
+
+static int kvm_trng_do_rnd(struct kvm_vcpu *vcpu, int size)
+{
+	DECLARE_BITMAP(bits, TRNG_MAX_BITS64);
+	u32 num_bits = smccc_get_arg1(vcpu);
+	int i;
+
+	if (num_bits > 3 * size) {
+		smccc_set_retval(vcpu, TRNG_INVALID_PARAMETER, 0, 0, 0);
+		return 1;
+	}
+
+	/* get as many bits as we need to fulfil the request */
+	for (i = 0; i < DIV_ROUND_UP(num_bits, BITS_PER_LONG); i++)
+		bits[i] = get_random_long();
+
+	bitmap_clear(bits, num_bits, TRNG_MAX_BITS64 - num_bits);
+
+	if (size == 32)
+		smccc_set_retval(vcpu, TRNG_SUCCESS, lower_32_bits(bits[1]),
+				 upper_32_bits(bits[0]), lower_32_bits(bits[0]));
+	else
+		smccc_set_retval(vcpu, TRNG_SUCCESS, bits[2], bits[1], bits[0]);
+
+	memzero_explicit(bits, sizeof(bits));
+	return 1;
+}
+
+int kvm_trng_call(struct kvm_vcpu *vcpu)
+{
+	const __le32 *u = (__le32 *)arm_smc_trng_uuid.b;
+	u32 func_id = smccc_get_function(vcpu);
+	unsigned long val = TRNG_NOT_SUPPORTED;
+	int size = 64;
+
+	switch (func_id) {
+	case ARM_SMCCC_TRNG_VERSION:
+		val = ARM_SMCCC_TRNG_VERSION_1_0;
+		break;
+	case ARM_SMCCC_TRNG_FEATURES:
+		switch (smccc_get_arg1(vcpu)) {
+		case ARM_SMCCC_TRNG_VERSION:
+		case ARM_SMCCC_TRNG_FEATURES:
+		case ARM_SMCCC_TRNG_GET_UUID:
+		case ARM_SMCCC_TRNG_RND32:
+		case ARM_SMCCC_TRNG_RND64:
+			val = TRNG_SUCCESS;
+		}
+		break;
+	case ARM_SMCCC_TRNG_GET_UUID:
+		smccc_set_retval(vcpu, le32_to_cpu(u[0]), le32_to_cpu(u[1]),
+				 le32_to_cpu(u[2]), le32_to_cpu(u[3]));
+		return 1;
+	case ARM_SMCCC_TRNG_RND32:
+		size = 32;
+		fallthrough;
+	case ARM_SMCCC_TRNG_RND64:
+		return kvm_trng_do_rnd(vcpu, size);
+	}
+
+	smccc_set_retval(vcpu, val, 0, 0, 0);
+	return 1;
+}
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
new file mode 100644
index 000000000..91b22a014
--- /dev/null
+++ b/arch/arm64/kvm/va_layout.c
@@ -0,0 +1,298 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/random.h>
+#include <linux/memblock.h>
+#include <asm/alternative.h>
+#include <asm/debug-monitors.h>
+#include <asm/insn.h>
+#include <asm/kvm_mmu.h>
+#include <asm/memory.h>
+
+/*
+ * The LSB of the HYP VA tag
+ */
+static u8 tag_lsb;
+/*
+ * The HYP VA tag value with the region bit
+ */
+static u64 tag_val;
+static u64 va_mask;
+
+/*
+ * Compute HYP VA by using the same computation as kern_hyp_va().
+ */
+static u64 __early_kern_hyp_va(u64 addr)
+{
+	addr &= va_mask;
+	addr |= tag_val << tag_lsb;
+	return addr;
+}
+
+/*
+ * Store a hyp VA <-> PA offset into a EL2-owned variable.
+ */
+static void init_hyp_physvirt_offset(void)
+{
+	u64 kern_va, hyp_va;
+
+	/* Compute the offset from the hyp VA and PA of a random symbol. */
+	kern_va = (u64)lm_alias(__hyp_text_start);
+	hyp_va = __early_kern_hyp_va(kern_va);
+	hyp_physvirt_offset = (s64)__pa(kern_va) - (s64)hyp_va;
+}
+
+/*
+ * We want to generate a hyp VA with the following format (with V ==
+ * vabits_actual):
+ *
+ *  63 ... V |     V-1    | V-2 .. tag_lsb | tag_lsb - 1 .. 0
+ *  ---------------------------------------------------------
+ * | 0000000 | hyp_va_msb |   random tag   |  kern linear VA |
+ *           |--------- tag_val -----------|----- va_mask ---|
+ *
+ * which does not conflict with the idmap regions.
+ */
+__init void kvm_compute_layout(void)
+{
+	phys_addr_t idmap_addr = __pa_symbol(__hyp_idmap_text_start);
+	u64 hyp_va_msb;
+
+	/* Where is my RAM region? */
+	hyp_va_msb  = idmap_addr & BIT(vabits_actual - 1);
+	hyp_va_msb ^= BIT(vabits_actual - 1);
+
+	tag_lsb = fls64((u64)phys_to_virt(memblock_start_of_DRAM()) ^
+			(u64)(high_memory - 1));
+
+	va_mask = GENMASK_ULL(tag_lsb - 1, 0);
+	tag_val = hyp_va_msb;
+
+	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && tag_lsb != (vabits_actual - 1)) {
+		/* We have some free bits to insert a random tag. */
+		tag_val |= get_random_long() & GENMASK_ULL(vabits_actual - 2, tag_lsb);
+	}
+	tag_val >>= tag_lsb;
+
+	init_hyp_physvirt_offset();
+}
+
+/*
+ * The .hyp.reloc ELF section contains a list of kimg positions that
+ * contains kimg VAs but will be accessed only in hyp execution context.
+ * Convert them to hyp VAs. See gen-hyprel.c for more details.
+ */
+__init void kvm_apply_hyp_relocations(void)
+{
+	int32_t *rel;
+	int32_t *begin = (int32_t *)__hyp_reloc_begin;
+	int32_t *end = (int32_t *)__hyp_reloc_end;
+
+	for (rel = begin; rel < end; ++rel) {
+		uintptr_t *ptr, kimg_va;
+
+		/*
+		 * Each entry contains a 32-bit relative offset from itself
+		 * to a kimg VA position.
+		 */
+		ptr = (uintptr_t *)lm_alias((char *)rel + *rel);
+
+		/* Read the kimg VA value at the relocation address. */
+		kimg_va = *ptr;
+
+		/* Convert to hyp VA and store back to the relocation address. */
+		*ptr = __early_kern_hyp_va((uintptr_t)lm_alias(kimg_va));
+	}
+}
+
+static u32 compute_instruction(int n, u32 rd, u32 rn)
+{
+	u32 insn = AARCH64_BREAK_FAULT;
+
+	switch (n) {
+	case 0:
+		insn = aarch64_insn_gen_logical_immediate(AARCH64_INSN_LOGIC_AND,
+							  AARCH64_INSN_VARIANT_64BIT,
+							  rn, rd, va_mask);
+		break;
+
+	case 1:
+		/* ROR is a variant of EXTR with Rm = Rn */
+		insn = aarch64_insn_gen_extr(AARCH64_INSN_VARIANT_64BIT,
+					     rn, rn, rd,
+					     tag_lsb);
+		break;
+
+	case 2:
+		insn = aarch64_insn_gen_add_sub_imm(rd, rn,
+						    tag_val & GENMASK(11, 0),
+						    AARCH64_INSN_VARIANT_64BIT,
+						    AARCH64_INSN_ADSB_ADD);
+		break;
+
+	case 3:
+		insn = aarch64_insn_gen_add_sub_imm(rd, rn,
+						    tag_val & GENMASK(23, 12),
+						    AARCH64_INSN_VARIANT_64BIT,
+						    AARCH64_INSN_ADSB_ADD);
+		break;
+
+	case 4:
+		/* ROR is a variant of EXTR with Rm = Rn */
+		insn = aarch64_insn_gen_extr(AARCH64_INSN_VARIANT_64BIT,
+					     rn, rn, rd, 64 - tag_lsb);
+		break;
+	}
+
+	return insn;
+}
+
+void __init kvm_update_va_mask(struct alt_instr *alt,
+			       __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	int i;
+
+	BUG_ON(nr_inst != 5);
+
+	for (i = 0; i < nr_inst; i++) {
+		u32 rd, rn, insn, oinsn;
+
+		/*
+		 * VHE doesn't need any address translation, let's NOP
+		 * everything.
+		 *
+		 * Alternatively, if the tag is zero (because the layout
+		 * dictates it and we don't have any spare bits in the
+		 * address), NOP everything after masking the kernel VA.
+		 */
+		if (cpus_have_cap(ARM64_HAS_VIRT_HOST_EXTN) || (!tag_val && i > 0)) {
+			updptr[i] = cpu_to_le32(aarch64_insn_gen_nop());
+			continue;
+		}
+
+		oinsn = le32_to_cpu(origptr[i]);
+		rd = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RD, oinsn);
+		rn = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RN, oinsn);
+
+		insn = compute_instruction(i, rd, rn);
+		BUG_ON(insn == AARCH64_BREAK_FAULT);
+
+		updptr[i] = cpu_to_le32(insn);
+	}
+}
+
+void kvm_patch_vector_branch(struct alt_instr *alt,
+			     __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	u64 addr;
+	u32 insn;
+
+	BUG_ON(nr_inst != 4);
+
+	if (!cpus_have_cap(ARM64_SPECTRE_V3A) ||
+	    WARN_ON_ONCE(cpus_have_cap(ARM64_HAS_VIRT_HOST_EXTN)))
+		return;
+
+	/*
+	 * Compute HYP VA by using the same computation as kern_hyp_va()
+	 */
+	addr = __early_kern_hyp_va((u64)kvm_ksym_ref(__kvm_hyp_vector));
+
+	/* Use PC[10:7] to branch to the same vector in KVM */
+	addr |= ((u64)origptr & GENMASK_ULL(10, 7));
+
+	/*
+	 * Branch over the preamble in order to avoid the initial store on
+	 * the stack (which we already perform in the hardening vectors).
+	 */
+	addr += KVM_VECTOR_PREAMBLE;
+
+	/* movz x0, #(addr & 0xffff) */
+	insn = aarch64_insn_gen_movewide(AARCH64_INSN_REG_0,
+					 (u16)addr,
+					 0,
+					 AARCH64_INSN_VARIANT_64BIT,
+					 AARCH64_INSN_MOVEWIDE_ZERO);
+	*updptr++ = cpu_to_le32(insn);
+
+	/* movk x0, #((addr >> 16) & 0xffff), lsl #16 */
+	insn = aarch64_insn_gen_movewide(AARCH64_INSN_REG_0,
+					 (u16)(addr >> 16),
+					 16,
+					 AARCH64_INSN_VARIANT_64BIT,
+					 AARCH64_INSN_MOVEWIDE_KEEP);
+	*updptr++ = cpu_to_le32(insn);
+
+	/* movk x0, #((addr >> 32) & 0xffff), lsl #32 */
+	insn = aarch64_insn_gen_movewide(AARCH64_INSN_REG_0,
+					 (u16)(addr >> 32),
+					 32,
+					 AARCH64_INSN_VARIANT_64BIT,
+					 AARCH64_INSN_MOVEWIDE_KEEP);
+	*updptr++ = cpu_to_le32(insn);
+
+	/* br x0 */
+	insn = aarch64_insn_gen_branch_reg(AARCH64_INSN_REG_0,
+					   AARCH64_INSN_BRANCH_NOLINK);
+	*updptr++ = cpu_to_le32(insn);
+}
+
+static void generate_mov_q(u64 val, __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	u32 insn, oinsn, rd;
+
+	BUG_ON(nr_inst != 4);
+
+	/* Compute target register */
+	oinsn = le32_to_cpu(*origptr);
+	rd = aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RD, oinsn);
+
+	/* movz rd, #(val & 0xffff) */
+	insn = aarch64_insn_gen_movewide(rd,
+					 (u16)val,
+					 0,
+					 AARCH64_INSN_VARIANT_64BIT,
+					 AARCH64_INSN_MOVEWIDE_ZERO);
+	*updptr++ = cpu_to_le32(insn);
+
+	/* movk rd, #((val >> 16) & 0xffff), lsl #16 */
+	insn = aarch64_insn_gen_movewide(rd,
+					 (u16)(val >> 16),
+					 16,
+					 AARCH64_INSN_VARIANT_64BIT,
+					 AARCH64_INSN_MOVEWIDE_KEEP);
+	*updptr++ = cpu_to_le32(insn);
+
+	/* movk rd, #((val >> 32) & 0xffff), lsl #32 */
+	insn = aarch64_insn_gen_movewide(rd,
+					 (u16)(val >> 32),
+					 32,
+					 AARCH64_INSN_VARIANT_64BIT,
+					 AARCH64_INSN_MOVEWIDE_KEEP);
+	*updptr++ = cpu_to_le32(insn);
+
+	/* movk rd, #((val >> 48) & 0xffff), lsl #48 */
+	insn = aarch64_insn_gen_movewide(rd,
+					 (u16)(val >> 48),
+					 48,
+					 AARCH64_INSN_VARIANT_64BIT,
+					 AARCH64_INSN_MOVEWIDE_KEEP);
+	*updptr++ = cpu_to_le32(insn);
+}
+
+void kvm_get_kimage_voffset(struct alt_instr *alt,
+			    __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	generate_mov_q(kimage_voffset, origptr, updptr, nr_inst);
+}
+
+void kvm_compute_final_ctr_el0(struct alt_instr *alt,
+			       __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	generate_mov_q(read_sanitised_ftr_reg(SYS_CTR_EL0),
+		       origptr, updptr, nr_inst);
+}
diff --git a/arch/arm64/kvm/vgic-sys-reg-v3.c b/arch/arm64/kvm/vgic-sys-reg-v3.c
new file mode 100644
index 000000000..9e7c486b4
--- /dev/null
+++ b/arch/arm64/kvm/vgic-sys-reg-v3.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VGIC system registers handling functions for AArch64 mode
+ */
+
+#include <linux/irqchip/arm-gic-v3.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include "vgic/vgic.h"
+#include "sys_regs.h"
+
+static int set_gic_ctlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 val)
+{
+	u32 host_pri_bits, host_id_bits, host_seis, host_a3v, seis, a3v;
+	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+
+	/*
+	 * Disallow restoring VM state if not supported by this
+	 * hardware.
+	 */
+	host_pri_bits = FIELD_GET(ICC_CTLR_EL1_PRI_BITS_MASK, val) + 1;
+	if (host_pri_bits > vgic_v3_cpu->num_pri_bits)
+		return -EINVAL;
+
+	vgic_v3_cpu->num_pri_bits = host_pri_bits;
+
+	host_id_bits = FIELD_GET(ICC_CTLR_EL1_ID_BITS_MASK, val);
+	if (host_id_bits > vgic_v3_cpu->num_id_bits)
+		return -EINVAL;
+
+	vgic_v3_cpu->num_id_bits = host_id_bits;
+
+	host_seis = FIELD_GET(ICH_VTR_SEIS_MASK, kvm_vgic_global_state.ich_vtr_el2);
+	seis = FIELD_GET(ICC_CTLR_EL1_SEIS_MASK, val);
+	if (host_seis != seis)
+		return -EINVAL;
+
+	host_a3v = FIELD_GET(ICH_VTR_A3V_MASK, kvm_vgic_global_state.ich_vtr_el2);
+	a3v = FIELD_GET(ICC_CTLR_EL1_A3V_MASK, val);
+	if (host_a3v != a3v)
+		return -EINVAL;
+
+	/*
+	 * Here set VMCR.CTLR in ICC_CTLR_EL1 layout.
+	 * The vgic_set_vmcr() will convert to ICH_VMCR layout.
+	 */
+	vmcr.cbpr = FIELD_GET(ICC_CTLR_EL1_CBPR_MASK, val);
+	vmcr.eoim = FIELD_GET(ICC_CTLR_EL1_EOImode_MASK, val);
+	vgic_set_vmcr(vcpu, &vmcr);
+
+	return 0;
+}
+
+static int get_gic_ctlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 *valp)
+{
+	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_vmcr vmcr;
+	u64 val;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	val = 0;
+	val |= FIELD_PREP(ICC_CTLR_EL1_PRI_BITS_MASK, vgic_v3_cpu->num_pri_bits - 1);
+	val |= FIELD_PREP(ICC_CTLR_EL1_ID_BITS_MASK, vgic_v3_cpu->num_id_bits);
+	val |= FIELD_PREP(ICC_CTLR_EL1_SEIS_MASK,
+			  FIELD_GET(ICH_VTR_SEIS_MASK,
+				    kvm_vgic_global_state.ich_vtr_el2));
+	val |= FIELD_PREP(ICC_CTLR_EL1_A3V_MASK,
+			  FIELD_GET(ICH_VTR_A3V_MASK, kvm_vgic_global_state.ich_vtr_el2));
+	/*
+	 * The VMCR.CTLR value is in ICC_CTLR_EL1 layout.
+	 * Extract it directly using ICC_CTLR_EL1 reg definitions.
+	 */
+	val |= FIELD_PREP(ICC_CTLR_EL1_CBPR_MASK, vmcr.cbpr);
+	val |= FIELD_PREP(ICC_CTLR_EL1_EOImode_MASK, vmcr.eoim);
+
+	*valp = val;
+
+	return 0;
+}
+
+static int set_gic_pmr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+		       u64 val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	vmcr.pmr = FIELD_GET(ICC_PMR_EL1_MASK, val);
+	vgic_set_vmcr(vcpu, &vmcr);
+
+	return 0;
+}
+
+static int get_gic_pmr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+		       u64 *val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	*val = FIELD_PREP(ICC_PMR_EL1_MASK, vmcr.pmr);
+
+	return 0;
+}
+
+static int set_gic_bpr0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	vmcr.bpr = FIELD_GET(ICC_BPR0_EL1_MASK, val);
+	vgic_set_vmcr(vcpu, &vmcr);
+
+	return 0;
+}
+
+static int get_gic_bpr0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 *val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	*val = FIELD_PREP(ICC_BPR0_EL1_MASK, vmcr.bpr);
+
+	return 0;
+}
+
+static int set_gic_bpr1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (!vmcr.cbpr) {
+		vmcr.abpr = FIELD_GET(ICC_BPR1_EL1_MASK, val);
+		vgic_set_vmcr(vcpu, &vmcr);
+	}
+
+	return 0;
+}
+
+static int get_gic_bpr1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 *val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (!vmcr.cbpr)
+		*val = FIELD_PREP(ICC_BPR1_EL1_MASK, vmcr.abpr);
+	else
+		*val = min((vmcr.bpr + 1), 7U);
+
+
+	return 0;
+}
+
+static int set_gic_grpen0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			  u64 val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	vmcr.grpen0 = FIELD_GET(ICC_IGRPEN0_EL1_MASK, val);
+	vgic_set_vmcr(vcpu, &vmcr);
+
+	return 0;
+}
+
+static int get_gic_grpen0(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			  u64 *val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	*val = FIELD_PREP(ICC_IGRPEN0_EL1_MASK, vmcr.grpen0);
+
+	return 0;
+}
+
+static int set_gic_grpen1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			  u64 val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	vmcr.grpen1 = FIELD_GET(ICC_IGRPEN1_EL1_MASK, val);
+	vgic_set_vmcr(vcpu, &vmcr);
+
+	return 0;
+}
+
+static int get_gic_grpen1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			  u64 *val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	*val = FIELD_GET(ICC_IGRPEN1_EL1_MASK, vmcr.grpen1);
+
+	return 0;
+}
+
+static void set_apr_reg(struct kvm_vcpu *vcpu, u64 val, u8 apr, u8 idx)
+{
+	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	if (apr)
+		vgicv3->vgic_ap1r[idx] = val;
+	else
+		vgicv3->vgic_ap0r[idx] = val;
+}
+
+static u64 get_apr_reg(struct kvm_vcpu *vcpu, u8 apr, u8 idx)
+{
+	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	if (apr)
+		return vgicv3->vgic_ap1r[idx];
+	else
+		return vgicv3->vgic_ap0r[idx];
+}
+
+static int set_gic_ap0r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 val)
+
+{
+	u8 idx = r->Op2 & 3;
+
+	if (idx > vgic_v3_max_apr_idx(vcpu))
+		return -EINVAL;
+
+	set_apr_reg(vcpu, val, 0, idx);
+	return 0;
+}
+
+static int get_gic_ap0r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 *val)
+{
+	u8 idx = r->Op2 & 3;
+
+	if (idx > vgic_v3_max_apr_idx(vcpu))
+		return -EINVAL;
+
+	*val = get_apr_reg(vcpu, 0, idx);
+
+	return 0;
+}
+
+static int set_gic_ap1r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 val)
+
+{
+	u8 idx = r->Op2 & 3;
+
+	if (idx > vgic_v3_max_apr_idx(vcpu))
+		return -EINVAL;
+
+	set_apr_reg(vcpu, val, 1, idx);
+	return 0;
+}
+
+static int get_gic_ap1r(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+			u64 *val)
+{
+	u8 idx = r->Op2 & 3;
+
+	if (idx > vgic_v3_max_apr_idx(vcpu))
+		return -EINVAL;
+
+	*val = get_apr_reg(vcpu, 1, idx);
+
+	return 0;
+}
+
+static int set_gic_sre(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+		       u64 val)
+{
+	/* Validate SRE bit */
+	if (!(val & ICC_SRE_EL1_SRE))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int get_gic_sre(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+		       u64 *val)
+{
+	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	*val = vgicv3->vgic_sre;
+
+	return 0;
+}
+
+static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
+	{ SYS_DESC(SYS_ICC_PMR_EL1),
+	  .set_user = set_gic_pmr, .get_user = get_gic_pmr, },
+	{ SYS_DESC(SYS_ICC_BPR0_EL1),
+	  .set_user = set_gic_bpr0, .get_user = get_gic_bpr0, },
+	{ SYS_DESC(SYS_ICC_AP0R0_EL1),
+	  .set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
+	{ SYS_DESC(SYS_ICC_AP0R1_EL1),
+	  .set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
+	{ SYS_DESC(SYS_ICC_AP0R2_EL1),
+	  .set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
+	{ SYS_DESC(SYS_ICC_AP0R3_EL1),
+	  .set_user = set_gic_ap0r, .get_user = get_gic_ap0r, },
+	{ SYS_DESC(SYS_ICC_AP1R0_EL1),
+	  .set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
+	{ SYS_DESC(SYS_ICC_AP1R1_EL1),
+	  .set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
+	{ SYS_DESC(SYS_ICC_AP1R2_EL1),
+	  .set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
+	{ SYS_DESC(SYS_ICC_AP1R3_EL1),
+	  .set_user = set_gic_ap1r, .get_user = get_gic_ap1r, },
+	{ SYS_DESC(SYS_ICC_BPR1_EL1),
+	  .set_user = set_gic_bpr1, .get_user = get_gic_bpr1, },
+	{ SYS_DESC(SYS_ICC_CTLR_EL1),
+	  .set_user = set_gic_ctlr, .get_user = get_gic_ctlr, },
+	{ SYS_DESC(SYS_ICC_SRE_EL1),
+	  .set_user = set_gic_sre, .get_user = get_gic_sre, },
+	{ SYS_DESC(SYS_ICC_IGRPEN0_EL1),
+	  .set_user = set_gic_grpen0, .get_user = get_gic_grpen0, },
+	{ SYS_DESC(SYS_ICC_IGRPEN1_EL1),
+	  .set_user = set_gic_grpen1, .get_user = get_gic_grpen1, },
+};
+
+static u64 attr_to_id(u64 attr)
+{
+	return ARM64_SYS_REG(FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_OP0_MASK, attr),
+			     FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_OP1_MASK, attr),
+			     FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_CRN_MASK, attr),
+			     FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_CRM_MASK, attr),
+			     FIELD_GET(KVM_REG_ARM_VGIC_SYSREG_OP2_MASK, attr));
+}
+
+int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
+{
+	if (get_reg_by_id(attr_to_id(attr->attr), gic_v3_icc_reg_descs,
+			  ARRAY_SIZE(gic_v3_icc_reg_descs)))
+		return 0;
+
+	return -ENXIO;
+}
+
+int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu,
+				struct kvm_device_attr *attr,
+				bool is_write)
+{
+	struct kvm_one_reg reg = {
+		.id	= attr_to_id(attr->attr),
+		.addr	= attr->addr,
+	};
+
+	if (is_write)
+		return kvm_sys_reg_set_user(vcpu, &reg, gic_v3_icc_reg_descs,
+					    ARRAY_SIZE(gic_v3_icc_reg_descs));
+	else
+		return kvm_sys_reg_get_user(vcpu, &reg, gic_v3_icc_reg_descs,
+					    ARRAY_SIZE(gic_v3_icc_reg_descs));
+}
diff --git a/arch/arm64/kvm/vgic/trace.h b/arch/arm64/kvm/vgic/trace.h
new file mode 100644
index 000000000..83c64401a
--- /dev/null
+++ b/arch/arm64/kvm/vgic/trace.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#if !defined(_TRACE_VGIC_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_VGIC_H
+
+#include <linux/tracepoint.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+
+TRACE_EVENT(vgic_update_irq_pending,
+	TP_PROTO(unsigned long vcpu_id, __u32 irq, bool level),
+	TP_ARGS(vcpu_id, irq, level),
+
+	TP_STRUCT__entry(
+		__field(	unsigned long,	vcpu_id	)
+		__field(	__u32,		irq	)
+		__field(	bool,		level	)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_id	= vcpu_id;
+		__entry->irq		= irq;
+		__entry->level		= level;
+	),
+
+	TP_printk("VCPU: %ld, IRQ %d, level: %d",
+		  __entry->vcpu_id, __entry->irq, __entry->level)
+);
+
+#endif /* _TRACE_VGIC_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../arch/arm64/kvm/vgic
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/arch/arm64/kvm/vgic/vgic-debug.c b/arch/arm64/kvm/vgic/vgic-debug.c
new file mode 100644
index 000000000..07aa04371
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-debug.c
@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2016 Linaro
+ * Author: Christoffer Dall <christoffer.dall@linaro.org>
+ */
+
+#include <linux/cpu.h>
+#include <linux/debugfs.h>
+#include <linux/interrupt.h>
+#include <linux/kvm_host.h>
+#include <linux/seq_file.h>
+#include <kvm/arm_vgic.h>
+#include <asm/kvm_mmu.h>
+#include "vgic.h"
+
+/*
+ * Structure to control looping through the entire vgic state.  We start at
+ * zero for each field and move upwards.  So, if dist_id is 0 we print the
+ * distributor info.  When dist_id is 1, we have already printed it and move
+ * on.
+ *
+ * When vcpu_id < nr_cpus we print the vcpu info until vcpu_id == nr_cpus and
+ * so on.
+ */
+struct vgic_state_iter {
+	int nr_cpus;
+	int nr_spis;
+	int nr_lpis;
+	int dist_id;
+	int vcpu_id;
+	int intid;
+	int lpi_idx;
+	u32 *lpi_array;
+};
+
+static void iter_next(struct vgic_state_iter *iter)
+{
+	if (iter->dist_id == 0) {
+		iter->dist_id++;
+		return;
+	}
+
+	iter->intid++;
+	if (iter->intid == VGIC_NR_PRIVATE_IRQS &&
+	    ++iter->vcpu_id < iter->nr_cpus)
+		iter->intid = 0;
+
+	if (iter->intid >= (iter->nr_spis + VGIC_NR_PRIVATE_IRQS)) {
+		if (iter->lpi_idx < iter->nr_lpis)
+			iter->intid = iter->lpi_array[iter->lpi_idx];
+		iter->lpi_idx++;
+	}
+}
+
+static void iter_init(struct kvm *kvm, struct vgic_state_iter *iter,
+		      loff_t pos)
+{
+	int nr_cpus = atomic_read(&kvm->online_vcpus);
+
+	memset(iter, 0, sizeof(*iter));
+
+	iter->nr_cpus = nr_cpus;
+	iter->nr_spis = kvm->arch.vgic.nr_spis;
+	if (kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
+		iter->nr_lpis = vgic_copy_lpi_list(kvm, NULL, &iter->lpi_array);
+		if (iter->nr_lpis < 0)
+			iter->nr_lpis = 0;
+	}
+
+	/* Fast forward to the right position if needed */
+	while (pos--)
+		iter_next(iter);
+}
+
+static bool end_of_vgic(struct vgic_state_iter *iter)
+{
+	return iter->dist_id > 0 &&
+		iter->vcpu_id == iter->nr_cpus &&
+		iter->intid >= (iter->nr_spis + VGIC_NR_PRIVATE_IRQS) &&
+		iter->lpi_idx > iter->nr_lpis;
+}
+
+static void *vgic_debug_start(struct seq_file *s, loff_t *pos)
+{
+	struct kvm *kvm = s->private;
+	struct vgic_state_iter *iter;
+
+	mutex_lock(&kvm->arch.config_lock);
+	iter = kvm->arch.vgic.iter;
+	if (iter) {
+		iter = ERR_PTR(-EBUSY);
+		goto out;
+	}
+
+	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+	if (!iter) {
+		iter = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+
+	iter_init(kvm, iter, *pos);
+	kvm->arch.vgic.iter = iter;
+
+	if (end_of_vgic(iter))
+		iter = NULL;
+out:
+	mutex_unlock(&kvm->arch.config_lock);
+	return iter;
+}
+
+static void *vgic_debug_next(struct seq_file *s, void *v, loff_t *pos)
+{
+	struct kvm *kvm = s->private;
+	struct vgic_state_iter *iter = kvm->arch.vgic.iter;
+
+	++*pos;
+	iter_next(iter);
+	if (end_of_vgic(iter))
+		iter = NULL;
+	return iter;
+}
+
+static void vgic_debug_stop(struct seq_file *s, void *v)
+{
+	struct kvm *kvm = s->private;
+	struct vgic_state_iter *iter;
+
+	/*
+	 * If the seq file wasn't properly opened, there's nothing to clearn
+	 * up.
+	 */
+	if (IS_ERR(v))
+		return;
+
+	mutex_lock(&kvm->arch.config_lock);
+	iter = kvm->arch.vgic.iter;
+	kfree(iter->lpi_array);
+	kfree(iter);
+	kvm->arch.vgic.iter = NULL;
+	mutex_unlock(&kvm->arch.config_lock);
+}
+
+static void print_dist_state(struct seq_file *s, struct vgic_dist *dist)
+{
+	bool v3 = dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3;
+
+	seq_printf(s, "Distributor\n");
+	seq_printf(s, "===========\n");
+	seq_printf(s, "vgic_model:\t%s\n", v3 ? "GICv3" : "GICv2");
+	seq_printf(s, "nr_spis:\t%d\n", dist->nr_spis);
+	if (v3)
+		seq_printf(s, "nr_lpis:\t%d\n", dist->lpi_list_count);
+	seq_printf(s, "enabled:\t%d\n", dist->enabled);
+	seq_printf(s, "\n");
+
+	seq_printf(s, "P=pending_latch, L=line_level, A=active\n");
+	seq_printf(s, "E=enabled, H=hw, C=config (level=1, edge=0)\n");
+	seq_printf(s, "G=group\n");
+}
+
+static void print_header(struct seq_file *s, struct vgic_irq *irq,
+			 struct kvm_vcpu *vcpu)
+{
+	int id = 0;
+	char *hdr = "SPI ";
+
+	if (vcpu) {
+		hdr = "VCPU";
+		id = vcpu->vcpu_id;
+	}
+
+	seq_printf(s, "\n");
+	seq_printf(s, "%s%2d TYP   ID TGT_ID PLAEHCG     HWID   TARGET SRC PRI VCPU_ID\n", hdr, id);
+	seq_printf(s, "----------------------------------------------------------------\n");
+}
+
+static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
+			    struct kvm_vcpu *vcpu)
+{
+	char *type;
+	bool pending;
+
+	if (irq->intid < VGIC_NR_SGIS)
+		type = "SGI";
+	else if (irq->intid < VGIC_NR_PRIVATE_IRQS)
+		type = "PPI";
+	else if (irq->intid < VGIC_MAX_SPI)
+		type = "SPI";
+	else
+		type = "LPI";
+
+	if (irq->intid ==0 || irq->intid == VGIC_NR_PRIVATE_IRQS)
+		print_header(s, irq, vcpu);
+
+	pending = irq->pending_latch;
+	if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+		int err;
+
+		err = irq_get_irqchip_state(irq->host_irq,
+					    IRQCHIP_STATE_PENDING,
+					    &pending);
+		WARN_ON_ONCE(err);
+	}
+
+	seq_printf(s, "       %s %4d "
+		      "    %2d "
+		      "%d%d%d%d%d%d%d "
+		      "%8d "
+		      "%8x "
+		      " %2x "
+		      "%3d "
+		      "     %2d "
+		      "\n",
+			type, irq->intid,
+			(irq->target_vcpu) ? irq->target_vcpu->vcpu_id : -1,
+			pending,
+			irq->line_level,
+			irq->active,
+			irq->enabled,
+			irq->hw,
+			irq->config == VGIC_CONFIG_LEVEL,
+			irq->group,
+			irq->hwintid,
+			irq->mpidr,
+			irq->source,
+			irq->priority,
+			(irq->vcpu) ? irq->vcpu->vcpu_id : -1);
+}
+
+static int vgic_debug_show(struct seq_file *s, void *v)
+{
+	struct kvm *kvm = s->private;
+	struct vgic_state_iter *iter = v;
+	struct vgic_irq *irq;
+	struct kvm_vcpu *vcpu = NULL;
+	unsigned long flags;
+
+	if (iter->dist_id == 0) {
+		print_dist_state(s, &kvm->arch.vgic);
+		return 0;
+	}
+
+	if (!kvm->arch.vgic.initialized)
+		return 0;
+
+	if (iter->vcpu_id < iter->nr_cpus)
+		vcpu = kvm_get_vcpu(kvm, iter->vcpu_id);
+
+	irq = vgic_get_irq(kvm, vcpu, iter->intid);
+	if (!irq) {
+		seq_printf(s, "       LPI %4d freed\n", iter->intid);
+		return 0;
+	}
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	print_irq_state(s, irq, vcpu);
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+	vgic_put_irq(kvm, irq);
+	return 0;
+}
+
+static const struct seq_operations vgic_debug_sops = {
+	.start = vgic_debug_start,
+	.next  = vgic_debug_next,
+	.stop  = vgic_debug_stop,
+	.show  = vgic_debug_show
+};
+
+DEFINE_SEQ_ATTRIBUTE(vgic_debug);
+
+void vgic_debug_init(struct kvm *kvm)
+{
+	debugfs_create_file("vgic-state", 0444, kvm->debugfs_dentry, kvm,
+			    &vgic_debug_fops);
+}
+
+void vgic_debug_destroy(struct kvm *kvm)
+{
+}
diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
new file mode 100644
index 000000000..0919e3b8f
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-init.c
@@ -0,0 +1,641 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015, 2016 ARM Ltd.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/interrupt.h>
+#include <linux/cpu.h>
+#include <linux/kvm_host.h>
+#include <kvm/arm_vgic.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_mmu.h>
+#include "vgic.h"
+
+/*
+ * Initialization rules: there are multiple stages to the vgic
+ * initialization, both for the distributor and the CPU interfaces.  The basic
+ * idea is that even though the VGIC is not functional or not requested from
+ * user space, the critical path of the run loop can still call VGIC functions
+ * that just won't do anything, without them having to check additional
+ * initialization flags to ensure they don't look at uninitialized data
+ * structures.
+ *
+ * Distributor:
+ *
+ * - kvm_vgic_early_init(): initialization of static data that doesn't
+ *   depend on any sizing information or emulation type. No allocation
+ *   is allowed there.
+ *
+ * - vgic_init(): allocation and initialization of the generic data
+ *   structures that depend on sizing information (number of CPUs,
+ *   number of interrupts). Also initializes the vcpu specific data
+ *   structures. Can be executed lazily for GICv2.
+ *
+ * CPU Interface:
+ *
+ * - kvm_vgic_vcpu_init(): initialization of static data that
+ *   doesn't depend on any sizing information or emulation type. No
+ *   allocation is allowed there.
+ */
+
+/* EARLY INIT */
+
+/**
+ * kvm_vgic_early_init() - Initialize static VGIC VCPU data structures
+ * @kvm: The VM whose VGIC districutor should be initialized
+ *
+ * Only do initialization of static structures that don't require any
+ * allocation or sizing information from userspace.  vgic_init() called
+ * kvm_vgic_dist_init() which takes care of the rest.
+ */
+void kvm_vgic_early_init(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+
+	INIT_LIST_HEAD(&dist->lpi_list_head);
+	INIT_LIST_HEAD(&dist->lpi_translation_cache);
+	raw_spin_lock_init(&dist->lpi_list_lock);
+}
+
+/* CREATION */
+
+/**
+ * kvm_vgic_create: triggered by the instantiation of the VGIC device by
+ * user space, either through the legacy KVM_CREATE_IRQCHIP ioctl (v2 only)
+ * or through the generic KVM_CREATE_DEVICE API ioctl.
+ * irqchip_in_kernel() tells you if this function succeeded or not.
+ * @kvm: kvm struct pointer
+ * @type: KVM_DEV_TYPE_ARM_VGIC_V[23]
+ */
+int kvm_vgic_create(struct kvm *kvm, u32 type)
+{
+	struct kvm_vcpu *vcpu;
+	unsigned long i;
+	int ret;
+
+	/*
+	 * This function is also called by the KVM_CREATE_IRQCHIP handler,
+	 * which had no chance yet to check the availability of the GICv2
+	 * emulation. So check this here again. KVM_CREATE_DEVICE does
+	 * the proper checks already.
+	 */
+	if (type == KVM_DEV_TYPE_ARM_VGIC_V2 &&
+		!kvm_vgic_global_state.can_emulate_gicv2)
+		return -ENODEV;
+
+	/* Must be held to avoid race with vCPU creation */
+	lockdep_assert_held(&kvm->lock);
+
+	ret = -EBUSY;
+	if (!lock_all_vcpus(kvm))
+		return ret;
+
+	mutex_lock(&kvm->arch.config_lock);
+
+	if (irqchip_in_kernel(kvm)) {
+		ret = -EEXIST;
+		goto out_unlock;
+	}
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (vcpu_has_run_once(vcpu))
+			goto out_unlock;
+	}
+	ret = 0;
+
+	if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
+		kvm->max_vcpus = VGIC_V2_MAX_CPUS;
+	else
+		kvm->max_vcpus = VGIC_V3_MAX_CPUS;
+
+	if (atomic_read(&kvm->online_vcpus) > kvm->max_vcpus) {
+		ret = -E2BIG;
+		goto out_unlock;
+	}
+
+	kvm->arch.vgic.in_kernel = true;
+	kvm->arch.vgic.vgic_model = type;
+
+	kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
+
+	if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
+		kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
+	else
+		INIT_LIST_HEAD(&kvm->arch.vgic.rd_regions);
+
+out_unlock:
+	mutex_unlock(&kvm->arch.config_lock);
+	unlock_all_vcpus(kvm);
+	return ret;
+}
+
+/* INIT/DESTROY */
+
+/**
+ * kvm_vgic_dist_init: initialize the dist data structures
+ * @kvm: kvm struct pointer
+ * @nr_spis: number of spis, frozen by caller
+ */
+static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu0 = kvm_get_vcpu(kvm, 0);
+	int i;
+
+	dist->spis = kcalloc(nr_spis, sizeof(struct vgic_irq), GFP_KERNEL_ACCOUNT);
+	if (!dist->spis)
+		return  -ENOMEM;
+
+	/*
+	 * In the following code we do not take the irq struct lock since
+	 * no other action on irq structs can happen while the VGIC is
+	 * not initialized yet:
+	 * If someone wants to inject an interrupt or does a MMIO access, we
+	 * require prior initialization in case of a virtual GICv3 or trigger
+	 * initialization when using a virtual GICv2.
+	 */
+	for (i = 0; i < nr_spis; i++) {
+		struct vgic_irq *irq = &dist->spis[i];
+
+		irq->intid = i + VGIC_NR_PRIVATE_IRQS;
+		INIT_LIST_HEAD(&irq->ap_list);
+		raw_spin_lock_init(&irq->irq_lock);
+		irq->vcpu = NULL;
+		irq->target_vcpu = vcpu0;
+		kref_init(&irq->refcount);
+		switch (dist->vgic_model) {
+		case KVM_DEV_TYPE_ARM_VGIC_V2:
+			irq->targets = 0;
+			irq->group = 0;
+			break;
+		case KVM_DEV_TYPE_ARM_VGIC_V3:
+			irq->mpidr = 0;
+			irq->group = 1;
+			break;
+		default:
+			kfree(dist->spis);
+			dist->spis = NULL;
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+/**
+ * kvm_vgic_vcpu_init() - Initialize static VGIC VCPU data
+ * structures and register VCPU-specific KVM iodevs
+ *
+ * @vcpu: pointer to the VCPU being created and initialized
+ *
+ * Only do initialization, but do not actually enable the
+ * VGIC CPU interface
+ */
+int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int ret = 0;
+	int i;
+
+	vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF;
+
+	INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
+	raw_spin_lock_init(&vgic_cpu->ap_list_lock);
+	atomic_set(&vgic_cpu->vgic_v3.its_vpe.vlpi_count, 0);
+
+	/*
+	 * Enable and configure all SGIs to be edge-triggered and
+	 * configure all PPIs as level-triggered.
+	 */
+	for (i = 0; i < VGIC_NR_PRIVATE_IRQS; i++) {
+		struct vgic_irq *irq = &vgic_cpu->private_irqs[i];
+
+		INIT_LIST_HEAD(&irq->ap_list);
+		raw_spin_lock_init(&irq->irq_lock);
+		irq->intid = i;
+		irq->vcpu = NULL;
+		irq->target_vcpu = vcpu;
+		kref_init(&irq->refcount);
+		if (vgic_irq_is_sgi(i)) {
+			/* SGIs */
+			irq->enabled = 1;
+			irq->config = VGIC_CONFIG_EDGE;
+		} else {
+			/* PPIs */
+			irq->config = VGIC_CONFIG_LEVEL;
+		}
+	}
+
+	if (!irqchip_in_kernel(vcpu->kvm))
+		return 0;
+
+	/*
+	 * If we are creating a VCPU with a GICv3 we must also register the
+	 * KVM io device for the redistributor that belongs to this VCPU.
+	 */
+	if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
+		mutex_lock(&vcpu->kvm->slots_lock);
+		ret = vgic_register_redist_iodev(vcpu);
+		mutex_unlock(&vcpu->kvm->slots_lock);
+	}
+	return ret;
+}
+
+static void kvm_vgic_vcpu_enable(struct kvm_vcpu *vcpu)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_enable(vcpu);
+	else
+		vgic_v3_enable(vcpu);
+}
+
+/*
+ * vgic_init: allocates and initializes dist and vcpu data structures
+ * depending on two dimensioning parameters:
+ * - the number of spis
+ * - the number of vcpus
+ * The function is generally called when nr_spis has been explicitly set
+ * by the guest through the KVM DEVICE API. If not nr_spis is set to 256.
+ * vgic_initialized() returns true when this function has succeeded.
+ */
+int vgic_init(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu;
+	int ret = 0, i;
+	unsigned long idx;
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+
+	if (vgic_initialized(kvm))
+		return 0;
+
+	/* Are we also in the middle of creating a VCPU? */
+	if (kvm->created_vcpus != atomic_read(&kvm->online_vcpus))
+		return -EBUSY;
+
+	/* freeze the number of spis */
+	if (!dist->nr_spis)
+		dist->nr_spis = VGIC_NR_IRQS_LEGACY - VGIC_NR_PRIVATE_IRQS;
+
+	ret = kvm_vgic_dist_init(kvm, dist->nr_spis);
+	if (ret)
+		goto out;
+
+	/* Initialize groups on CPUs created before the VGIC type was known */
+	kvm_for_each_vcpu(idx, vcpu, kvm) {
+		struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+		for (i = 0; i < VGIC_NR_PRIVATE_IRQS; i++) {
+			struct vgic_irq *irq = &vgic_cpu->private_irqs[i];
+			switch (dist->vgic_model) {
+			case KVM_DEV_TYPE_ARM_VGIC_V3:
+				irq->group = 1;
+				irq->mpidr = kvm_vcpu_get_mpidr_aff(vcpu);
+				break;
+			case KVM_DEV_TYPE_ARM_VGIC_V2:
+				irq->group = 0;
+				irq->targets = 1U << idx;
+				break;
+			default:
+				ret = -EINVAL;
+				goto out;
+			}
+		}
+	}
+
+	if (vgic_has_its(kvm))
+		vgic_lpi_translation_cache_init(kvm);
+
+	/*
+	 * If we have GICv4.1 enabled, unconditionnaly request enable the
+	 * v4 support so that we get HW-accelerated vSGIs. Otherwise, only
+	 * enable it if we present a virtual ITS to the guest.
+	 */
+	if (vgic_supports_direct_msis(kvm)) {
+		ret = vgic_v4_init(kvm);
+		if (ret)
+			goto out;
+	}
+
+	kvm_for_each_vcpu(idx, vcpu, kvm)
+		kvm_vgic_vcpu_enable(vcpu);
+
+	ret = kvm_vgic_setup_default_irq_routing(kvm);
+	if (ret)
+		goto out;
+
+	vgic_debug_init(kvm);
+
+	/*
+	 * If userspace didn't set the GIC implementation revision,
+	 * default to the latest and greatest. You know want it.
+	 */
+	if (!dist->implementation_rev)
+		dist->implementation_rev = KVM_VGIC_IMP_REV_LATEST;
+	dist->initialized = true;
+
+out:
+	return ret;
+}
+
+static void kvm_vgic_dist_destroy(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_redist_region *rdreg, *next;
+
+	dist->ready = false;
+	dist->initialized = false;
+
+	kfree(dist->spis);
+	dist->spis = NULL;
+	dist->nr_spis = 0;
+	dist->vgic_dist_base = VGIC_ADDR_UNDEF;
+
+	if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
+		list_for_each_entry_safe(rdreg, next, &dist->rd_regions, list)
+			vgic_v3_free_redist_region(rdreg);
+		INIT_LIST_HEAD(&dist->rd_regions);
+	} else {
+		dist->vgic_cpu_base = VGIC_ADDR_UNDEF;
+	}
+
+	if (vgic_has_its(kvm))
+		vgic_lpi_translation_cache_destroy(kvm);
+
+	if (vgic_supports_direct_msis(kvm))
+		vgic_v4_teardown(kvm);
+}
+
+static void __kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+	/*
+	 * Retire all pending LPIs on this vcpu anyway as we're
+	 * going to destroy it.
+	 */
+	vgic_flush_pending_lpis(vcpu);
+
+	INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
+	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
+		vgic_unregister_redist_iodev(vcpu);
+		vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF;
+	}
+}
+
+void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+
+	mutex_lock(&kvm->slots_lock);
+	__kvm_vgic_vcpu_destroy(vcpu);
+	mutex_unlock(&kvm->slots_lock);
+}
+
+void kvm_vgic_destroy(struct kvm *kvm)
+{
+	struct kvm_vcpu *vcpu;
+	unsigned long i;
+
+	mutex_lock(&kvm->slots_lock);
+
+	vgic_debug_destroy(kvm);
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		__kvm_vgic_vcpu_destroy(vcpu);
+
+	mutex_lock(&kvm->arch.config_lock);
+
+	kvm_vgic_dist_destroy(kvm);
+
+	mutex_unlock(&kvm->arch.config_lock);
+	mutex_unlock(&kvm->slots_lock);
+}
+
+/**
+ * vgic_lazy_init: Lazy init is only allowed if the GIC exposed to the guest
+ * is a GICv2. A GICv3 must be explicitly initialized by the guest using the
+ * KVM_DEV_ARM_VGIC_GRP_CTRL KVM_DEVICE group.
+ * @kvm: kvm struct pointer
+ */
+int vgic_lazy_init(struct kvm *kvm)
+{
+	int ret = 0;
+
+	if (unlikely(!vgic_initialized(kvm))) {
+		/*
+		 * We only provide the automatic initialization of the VGIC
+		 * for the legacy case of a GICv2. Any other type must
+		 * be explicitly initialized once setup with the respective
+		 * KVM device call.
+		 */
+		if (kvm->arch.vgic.vgic_model != KVM_DEV_TYPE_ARM_VGIC_V2)
+			return -EBUSY;
+
+		mutex_lock(&kvm->arch.config_lock);
+		ret = vgic_init(kvm);
+		mutex_unlock(&kvm->arch.config_lock);
+	}
+
+	return ret;
+}
+
+/* RESOURCE MAPPING */
+
+/**
+ * Map the MMIO regions depending on the VGIC model exposed to the guest
+ * called on the first VCPU run.
+ * Also map the virtual CPU interface into the VM.
+ * v2 calls vgic_init() if not already done.
+ * v3 and derivatives return an error if the VGIC is not initialized.
+ * vgic_ready() returns true if this function has succeeded.
+ * @kvm: kvm struct pointer
+ */
+int kvm_vgic_map_resources(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	enum vgic_type type;
+	gpa_t dist_base;
+	int ret = 0;
+
+	if (likely(vgic_ready(kvm)))
+		return 0;
+
+	mutex_lock(&kvm->slots_lock);
+	mutex_lock(&kvm->arch.config_lock);
+	if (vgic_ready(kvm))
+		goto out;
+
+	if (!irqchip_in_kernel(kvm))
+		goto out;
+
+	if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2) {
+		ret = vgic_v2_map_resources(kvm);
+		type = VGIC_V2;
+	} else {
+		ret = vgic_v3_map_resources(kvm);
+		type = VGIC_V3;
+	}
+
+	if (ret)
+		goto out;
+
+	dist->ready = true;
+	dist_base = dist->vgic_dist_base;
+	mutex_unlock(&kvm->arch.config_lock);
+
+	ret = vgic_register_dist_iodev(kvm, dist_base, type);
+	if (ret)
+		kvm_err("Unable to register VGIC dist MMIO regions\n");
+
+	goto out_slots;
+out:
+	mutex_unlock(&kvm->arch.config_lock);
+out_slots:
+	mutex_unlock(&kvm->slots_lock);
+
+	if (ret)
+		kvm_vgic_destroy(kvm);
+
+	return ret;
+}
+
+/* GENERIC PROBE */
+
+static int vgic_init_cpu_starting(unsigned int cpu)
+{
+	enable_percpu_irq(kvm_vgic_global_state.maint_irq, 0);
+	return 0;
+}
+
+
+static int vgic_init_cpu_dying(unsigned int cpu)
+{
+	disable_percpu_irq(kvm_vgic_global_state.maint_irq);
+	return 0;
+}
+
+static irqreturn_t vgic_maintenance_handler(int irq, void *data)
+{
+	/*
+	 * We cannot rely on the vgic maintenance interrupt to be
+	 * delivered synchronously. This means we can only use it to
+	 * exit the VM, and we perform the handling of EOIed
+	 * interrupts on the exit path (see vgic_fold_lr_state).
+	 */
+	return IRQ_HANDLED;
+}
+
+static struct gic_kvm_info *gic_kvm_info;
+
+void __init vgic_set_kvm_info(const struct gic_kvm_info *info)
+{
+	BUG_ON(gic_kvm_info != NULL);
+	gic_kvm_info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (gic_kvm_info)
+		*gic_kvm_info = *info;
+}
+
+/**
+ * kvm_vgic_init_cpu_hardware - initialize the GIC VE hardware
+ *
+ * For a specific CPU, initialize the GIC VE hardware.
+ */
+void kvm_vgic_init_cpu_hardware(void)
+{
+	BUG_ON(preemptible());
+
+	/*
+	 * We want to make sure the list registers start out clear so that we
+	 * only have the program the used registers.
+	 */
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_init_lrs();
+	else
+		kvm_call_hyp(__vgic_v3_init_lrs);
+}
+
+/**
+ * kvm_vgic_hyp_init: populates the kvm_vgic_global_state variable
+ * according to the host GIC model. Accordingly calls either
+ * vgic_v2/v3_probe which registers the KVM_DEVICE that can be
+ * instantiated by a guest later on .
+ */
+int kvm_vgic_hyp_init(void)
+{
+	bool has_mask;
+	int ret;
+
+	if (!gic_kvm_info)
+		return -ENODEV;
+
+	has_mask = !gic_kvm_info->no_maint_irq_mask;
+
+	if (has_mask && !gic_kvm_info->maint_irq) {
+		kvm_err("No vgic maintenance irq\n");
+		return -ENXIO;
+	}
+
+	/*
+	 * If we get one of these oddball non-GICs, taint the kernel,
+	 * as we have no idea of how they *really* behave.
+	 */
+	if (gic_kvm_info->no_hw_deactivation) {
+		kvm_info("Non-architectural vgic, tainting kernel\n");
+		add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
+		kvm_vgic_global_state.no_hw_deactivation = true;
+	}
+
+	switch (gic_kvm_info->type) {
+	case GIC_V2:
+		ret = vgic_v2_probe(gic_kvm_info);
+		break;
+	case GIC_V3:
+		ret = vgic_v3_probe(gic_kvm_info);
+		if (!ret) {
+			static_branch_enable(&kvm_vgic_global_state.gicv3_cpuif);
+			kvm_info("GIC system register CPU interface enabled\n");
+		}
+		break;
+	default:
+		ret = -ENODEV;
+	}
+
+	kvm_vgic_global_state.maint_irq = gic_kvm_info->maint_irq;
+
+	kfree(gic_kvm_info);
+	gic_kvm_info = NULL;
+
+	if (ret)
+		return ret;
+
+	if (!has_mask)
+		return 0;
+
+	ret = request_percpu_irq(kvm_vgic_global_state.maint_irq,
+				 vgic_maintenance_handler,
+				 "vgic", kvm_get_running_vcpus());
+	if (ret) {
+		kvm_err("Cannot register interrupt %d\n",
+			kvm_vgic_global_state.maint_irq);
+		return ret;
+	}
+
+	ret = cpuhp_setup_state(CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,
+				"kvm/arm/vgic:starting",
+				vgic_init_cpu_starting, vgic_init_cpu_dying);
+	if (ret) {
+		kvm_err("Cannot register vgic CPU notifier\n");
+		goto out_free_irq;
+	}
+
+	kvm_info("vgic interrupt IRQ%d\n", kvm_vgic_global_state.maint_irq);
+	return 0;
+
+out_free_irq:
+	free_percpu_irq(kvm_vgic_global_state.maint_irq,
+			kvm_get_running_vcpus());
+	return ret;
+}
diff --git a/arch/arm64/kvm/vgic/vgic-irqfd.c b/arch/arm64/kvm/vgic/vgic-irqfd.c
new file mode 100644
index 000000000..475059bac
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-irqfd.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015, 2016 ARM Ltd.
+ */
+
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <trace/events/kvm.h>
+#include <kvm/arm_vgic.h>
+#include "vgic.h"
+
+/**
+ * vgic_irqfd_set_irq: inject the IRQ corresponding to the
+ * irqchip routing entry
+ *
+ * This is the entry point for irqfd IRQ injection
+ */
+static int vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry *e,
+			struct kvm *kvm, int irq_source_id,
+			int level, bool line_status)
+{
+	unsigned int spi_id = e->irqchip.pin + VGIC_NR_PRIVATE_IRQS;
+
+	if (!vgic_valid_spi(kvm, spi_id))
+		return -EINVAL;
+	return kvm_vgic_inject_irq(kvm, 0, spi_id, level, NULL);
+}
+
+/**
+ * kvm_set_routing_entry: populate a kvm routing entry
+ * from a user routing entry
+ *
+ * @kvm: the VM this entry is applied to
+ * @e: kvm kernel routing entry handle
+ * @ue: user api routing entry handle
+ * return 0 on success, -EINVAL on errors.
+ */
+int kvm_set_routing_entry(struct kvm *kvm,
+			  struct kvm_kernel_irq_routing_entry *e,
+			  const struct kvm_irq_routing_entry *ue)
+{
+	int r = -EINVAL;
+
+	switch (ue->type) {
+	case KVM_IRQ_ROUTING_IRQCHIP:
+		e->set = vgic_irqfd_set_irq;
+		e->irqchip.irqchip = ue->u.irqchip.irqchip;
+		e->irqchip.pin = ue->u.irqchip.pin;
+		if ((e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS) ||
+		    (e->irqchip.irqchip >= KVM_NR_IRQCHIPS))
+			goto out;
+		break;
+	case KVM_IRQ_ROUTING_MSI:
+		e->set = kvm_set_msi;
+		e->msi.address_lo = ue->u.msi.address_lo;
+		e->msi.address_hi = ue->u.msi.address_hi;
+		e->msi.data = ue->u.msi.data;
+		e->msi.flags = ue->flags;
+		e->msi.devid = ue->u.msi.devid;
+		break;
+	default:
+		goto out;
+	}
+	r = 0;
+out:
+	return r;
+}
+
+static void kvm_populate_msi(struct kvm_kernel_irq_routing_entry *e,
+			     struct kvm_msi *msi)
+{
+	msi->address_lo = e->msi.address_lo;
+	msi->address_hi = e->msi.address_hi;
+	msi->data = e->msi.data;
+	msi->flags = e->msi.flags;
+	msi->devid = e->msi.devid;
+}
+/**
+ * kvm_set_msi: inject the MSI corresponding to the
+ * MSI routing entry
+ *
+ * This is the entry point for irqfd MSI injection
+ * and userspace MSI injection.
+ */
+int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
+		struct kvm *kvm, int irq_source_id,
+		int level, bool line_status)
+{
+	struct kvm_msi msi;
+
+	if (!vgic_has_its(kvm))
+		return -ENODEV;
+
+	if (!level)
+		return -1;
+
+	kvm_populate_msi(e, &msi);
+	return vgic_its_inject_msi(kvm, &msi);
+}
+
+/**
+ * kvm_arch_set_irq_inatomic: fast-path for irqfd injection
+ */
+int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
+			      struct kvm *kvm, int irq_source_id, int level,
+			      bool line_status)
+{
+	if (!level)
+		return -EWOULDBLOCK;
+
+	switch (e->type) {
+	case KVM_IRQ_ROUTING_MSI: {
+		struct kvm_msi msi;
+
+		if (!vgic_has_its(kvm))
+			break;
+
+		kvm_populate_msi(e, &msi);
+		return vgic_its_inject_cached_translation(kvm, &msi);
+	}
+
+	case KVM_IRQ_ROUTING_IRQCHIP:
+		/*
+		 * Injecting SPIs is always possible in atomic context
+		 * as long as the damn vgic is initialized.
+		 */
+		if (unlikely(!vgic_initialized(kvm)))
+			break;
+		return vgic_irqfd_set_irq(e, kvm, irq_source_id, 1, line_status);
+	}
+
+	return -EWOULDBLOCK;
+}
+
+int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
+{
+	struct kvm_irq_routing_entry *entries;
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	u32 nr = dist->nr_spis;
+	int i, ret;
+
+	entries = kcalloc(nr, sizeof(*entries), GFP_KERNEL_ACCOUNT);
+	if (!entries)
+		return -ENOMEM;
+
+	for (i = 0; i < nr; i++) {
+		entries[i].gsi = i;
+		entries[i].type = KVM_IRQ_ROUTING_IRQCHIP;
+		entries[i].u.irqchip.irqchip = 0;
+		entries[i].u.irqchip.pin = i;
+	}
+	ret = kvm_set_irq_routing(kvm, entries, nr, 0);
+	kfree(entries);
+	return ret;
+}
diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
new file mode 100644
index 000000000..3c344e4cd
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -0,0 +1,2891 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * GICv3 ITS emulation
+ *
+ * Copyright (C) 2015,2016 ARM Ltd.
+ * Author: Andre Przywara <andre.przywara@arm.com>
+ */
+
+#include <linux/cpu.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/uaccess.h>
+#include <linux/list_sort.h>
+
+#include <linux/irqchip/arm-gic-v3.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+
+#include "vgic.h"
+#include "vgic-mmio.h"
+
+static int vgic_its_save_tables_v0(struct vgic_its *its);
+static int vgic_its_restore_tables_v0(struct vgic_its *its);
+static int vgic_its_commit_v0(struct vgic_its *its);
+static int update_lpi_config(struct kvm *kvm, struct vgic_irq *irq,
+			     struct kvm_vcpu *filter_vcpu, bool needs_inv);
+
+/*
+ * Creates a new (reference to a) struct vgic_irq for a given LPI.
+ * If this LPI is already mapped on another ITS, we increase its refcount
+ * and return a pointer to the existing structure.
+ * If this is a "new" LPI, we allocate and initialize a new struct vgic_irq.
+ * This function returns a pointer to the _unlocked_ structure.
+ */
+static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid,
+				     struct kvm_vcpu *vcpu)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_irq *irq = vgic_get_irq(kvm, NULL, intid), *oldirq;
+	unsigned long flags;
+	int ret;
+
+	/* In this case there is no put, since we keep the reference. */
+	if (irq)
+		return irq;
+
+	irq = kzalloc(sizeof(struct vgic_irq), GFP_KERNEL_ACCOUNT);
+	if (!irq)
+		return ERR_PTR(-ENOMEM);
+
+	INIT_LIST_HEAD(&irq->lpi_list);
+	INIT_LIST_HEAD(&irq->ap_list);
+	raw_spin_lock_init(&irq->irq_lock);
+
+	irq->config = VGIC_CONFIG_EDGE;
+	kref_init(&irq->refcount);
+	irq->intid = intid;
+	irq->target_vcpu = vcpu;
+	irq->group = 1;
+
+	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+
+	/*
+	 * There could be a race with another vgic_add_lpi(), so we need to
+	 * check that we don't add a second list entry with the same LPI.
+	 */
+	list_for_each_entry(oldirq, &dist->lpi_list_head, lpi_list) {
+		if (oldirq->intid != intid)
+			continue;
+
+		/* Someone was faster with adding this LPI, lets use that. */
+		kfree(irq);
+		irq = oldirq;
+
+		/*
+		 * This increases the refcount, the caller is expected to
+		 * call vgic_put_irq() on the returned pointer once it's
+		 * finished with the IRQ.
+		 */
+		vgic_get_irq_kref(irq);
+
+		goto out_unlock;
+	}
+
+	list_add_tail(&irq->lpi_list, &dist->lpi_list_head);
+	dist->lpi_list_count++;
+
+out_unlock:
+	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+
+	/*
+	 * We "cache" the configuration table entries in our struct vgic_irq's.
+	 * However we only have those structs for mapped IRQs, so we read in
+	 * the respective config data from memory here upon mapping the LPI.
+	 *
+	 * Should any of these fail, behave as if we couldn't create the LPI
+	 * by dropping the refcount and returning the error.
+	 */
+	ret = update_lpi_config(kvm, irq, NULL, false);
+	if (ret) {
+		vgic_put_irq(kvm, irq);
+		return ERR_PTR(ret);
+	}
+
+	ret = vgic_v3_lpi_sync_pending_status(kvm, irq);
+	if (ret) {
+		vgic_put_irq(kvm, irq);
+		return ERR_PTR(ret);
+	}
+
+	return irq;
+}
+
+struct its_device {
+	struct list_head dev_list;
+
+	/* the head for the list of ITTEs */
+	struct list_head itt_head;
+	u32 num_eventid_bits;
+	gpa_t itt_addr;
+	u32 device_id;
+};
+
+#define COLLECTION_NOT_MAPPED ((u32)~0)
+
+struct its_collection {
+	struct list_head coll_list;
+
+	u32 collection_id;
+	u32 target_addr;
+};
+
+#define its_is_collection_mapped(coll) ((coll) && \
+				((coll)->target_addr != COLLECTION_NOT_MAPPED))
+
+struct its_ite {
+	struct list_head ite_list;
+
+	struct vgic_irq *irq;
+	struct its_collection *collection;
+	u32 event_id;
+};
+
+struct vgic_translation_cache_entry {
+	struct list_head	entry;
+	phys_addr_t		db;
+	u32			devid;
+	u32			eventid;
+	struct vgic_irq		*irq;
+};
+
+/**
+ * struct vgic_its_abi - ITS abi ops and settings
+ * @cte_esz: collection table entry size
+ * @dte_esz: device table entry size
+ * @ite_esz: interrupt translation table entry size
+ * @save tables: save the ITS tables into guest RAM
+ * @restore_tables: restore the ITS internal structs from tables
+ *  stored in guest RAM
+ * @commit: initialize the registers which expose the ABI settings,
+ *  especially the entry sizes
+ */
+struct vgic_its_abi {
+	int cte_esz;
+	int dte_esz;
+	int ite_esz;
+	int (*save_tables)(struct vgic_its *its);
+	int (*restore_tables)(struct vgic_its *its);
+	int (*commit)(struct vgic_its *its);
+};
+
+#define ABI_0_ESZ	8
+#define ESZ_MAX		ABI_0_ESZ
+
+static const struct vgic_its_abi its_table_abi_versions[] = {
+	[0] = {
+	 .cte_esz = ABI_0_ESZ,
+	 .dte_esz = ABI_0_ESZ,
+	 .ite_esz = ABI_0_ESZ,
+	 .save_tables = vgic_its_save_tables_v0,
+	 .restore_tables = vgic_its_restore_tables_v0,
+	 .commit = vgic_its_commit_v0,
+	},
+};
+
+#define NR_ITS_ABIS	ARRAY_SIZE(its_table_abi_versions)
+
+inline const struct vgic_its_abi *vgic_its_get_abi(struct vgic_its *its)
+{
+	return &its_table_abi_versions[its->abi_rev];
+}
+
+static int vgic_its_set_abi(struct vgic_its *its, u32 rev)
+{
+	const struct vgic_its_abi *abi;
+
+	its->abi_rev = rev;
+	abi = vgic_its_get_abi(its);
+	return abi->commit(its);
+}
+
+/*
+ * Find and returns a device in the device table for an ITS.
+ * Must be called with the its_lock mutex held.
+ */
+static struct its_device *find_its_device(struct vgic_its *its, u32 device_id)
+{
+	struct its_device *device;
+
+	list_for_each_entry(device, &its->device_list, dev_list)
+		if (device_id == device->device_id)
+			return device;
+
+	return NULL;
+}
+
+/*
+ * Find and returns an interrupt translation table entry (ITTE) for a given
+ * Device ID/Event ID pair on an ITS.
+ * Must be called with the its_lock mutex held.
+ */
+static struct its_ite *find_ite(struct vgic_its *its, u32 device_id,
+				  u32 event_id)
+{
+	struct its_device *device;
+	struct its_ite *ite;
+
+	device = find_its_device(its, device_id);
+	if (device == NULL)
+		return NULL;
+
+	list_for_each_entry(ite, &device->itt_head, ite_list)
+		if (ite->event_id == event_id)
+			return ite;
+
+	return NULL;
+}
+
+/* To be used as an iterator this macro misses the enclosing parentheses */
+#define for_each_lpi_its(dev, ite, its) \
+	list_for_each_entry(dev, &(its)->device_list, dev_list) \
+		list_for_each_entry(ite, &(dev)->itt_head, ite_list)
+
+#define GIC_LPI_OFFSET 8192
+
+#define VITS_TYPER_IDBITS 16
+#define VITS_TYPER_DEVBITS 16
+#define VITS_DTE_MAX_DEVID_OFFSET	(BIT(14) - 1)
+#define VITS_ITE_MAX_EVENTID_OFFSET	(BIT(16) - 1)
+
+/*
+ * Finds and returns a collection in the ITS collection table.
+ * Must be called with the its_lock mutex held.
+ */
+static struct its_collection *find_collection(struct vgic_its *its, int coll_id)
+{
+	struct its_collection *collection;
+
+	list_for_each_entry(collection, &its->collection_list, coll_list) {
+		if (coll_id == collection->collection_id)
+			return collection;
+	}
+
+	return NULL;
+}
+
+#define LPI_PROP_ENABLE_BIT(p)	((p) & LPI_PROP_ENABLED)
+#define LPI_PROP_PRIORITY(p)	((p) & 0xfc)
+
+/*
+ * Reads the configuration data for a given LPI from guest memory and
+ * updates the fields in struct vgic_irq.
+ * If filter_vcpu is not NULL, applies only if the IRQ is targeting this
+ * VCPU. Unconditionally applies if filter_vcpu is NULL.
+ */
+static int update_lpi_config(struct kvm *kvm, struct vgic_irq *irq,
+			     struct kvm_vcpu *filter_vcpu, bool needs_inv)
+{
+	u64 propbase = GICR_PROPBASER_ADDRESS(kvm->arch.vgic.propbaser);
+	u8 prop;
+	int ret;
+	unsigned long flags;
+
+	ret = kvm_read_guest_lock(kvm, propbase + irq->intid - GIC_LPI_OFFSET,
+				  &prop, 1);
+
+	if (ret)
+		return ret;
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+	if (!filter_vcpu || filter_vcpu == irq->target_vcpu) {
+		irq->priority = LPI_PROP_PRIORITY(prop);
+		irq->enabled = LPI_PROP_ENABLE_BIT(prop);
+
+		if (!irq->hw) {
+			vgic_queue_irq_unlock(kvm, irq, flags);
+			return 0;
+		}
+	}
+
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+	if (irq->hw)
+		return its_prop_update_vlpi(irq->host_irq, prop, needs_inv);
+
+	return 0;
+}
+
+/*
+ * Create a snapshot of the current LPIs targeting @vcpu, so that we can
+ * enumerate those LPIs without holding any lock.
+ * Returns their number and puts the kmalloc'ed array into intid_ptr.
+ */
+int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_irq *irq;
+	unsigned long flags;
+	u32 *intids;
+	int irq_count, i = 0;
+
+	/*
+	 * There is an obvious race between allocating the array and LPIs
+	 * being mapped/unmapped. If we ended up here as a result of a
+	 * command, we're safe (locks are held, preventing another
+	 * command). If coming from another path (such as enabling LPIs),
+	 * we must be careful not to overrun the array.
+	 */
+	irq_count = READ_ONCE(dist->lpi_list_count);
+	intids = kmalloc_array(irq_count, sizeof(intids[0]), GFP_KERNEL_ACCOUNT);
+	if (!intids)
+		return -ENOMEM;
+
+	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+	list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
+		if (i == irq_count)
+			break;
+		/* We don't need to "get" the IRQ, as we hold the list lock. */
+		if (vcpu && irq->target_vcpu != vcpu)
+			continue;
+		intids[i++] = irq->intid;
+	}
+	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+
+	*intid_ptr = intids;
+	return i;
+}
+
+static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu)
+{
+	int ret = 0;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	irq->target_vcpu = vcpu;
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+	if (irq->hw) {
+		struct its_vlpi_map map;
+
+		ret = its_get_vlpi(irq->host_irq, &map);
+		if (ret)
+			return ret;
+
+		if (map.vpe)
+			atomic_dec(&map.vpe->vlpi_count);
+		map.vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+		atomic_inc(&map.vpe->vlpi_count);
+
+		ret = its_map_vlpi(irq->host_irq, &map);
+	}
+
+	return ret;
+}
+
+/*
+ * Promotes the ITS view of affinity of an ITTE (which redistributor this LPI
+ * is targeting) to the VGIC's view, which deals with target VCPUs.
+ * Needs to be called whenever either the collection for a LPIs has
+ * changed or the collection itself got retargeted.
+ */
+static void update_affinity_ite(struct kvm *kvm, struct its_ite *ite)
+{
+	struct kvm_vcpu *vcpu;
+
+	if (!its_is_collection_mapped(ite->collection))
+		return;
+
+	vcpu = kvm_get_vcpu(kvm, ite->collection->target_addr);
+	update_affinity(ite->irq, vcpu);
+}
+
+/*
+ * Updates the target VCPU for every LPI targeting this collection.
+ * Must be called with the its_lock mutex held.
+ */
+static void update_affinity_collection(struct kvm *kvm, struct vgic_its *its,
+				       struct its_collection *coll)
+{
+	struct its_device *device;
+	struct its_ite *ite;
+
+	for_each_lpi_its(device, ite, its) {
+		if (ite->collection != coll)
+			continue;
+
+		update_affinity_ite(kvm, ite);
+	}
+}
+
+static u32 max_lpis_propbaser(u64 propbaser)
+{
+	int nr_idbits = (propbaser & 0x1f) + 1;
+
+	return 1U << min(nr_idbits, INTERRUPT_ID_BITS_ITS);
+}
+
+/*
+ * Sync the pending table pending bit of LPIs targeting @vcpu
+ * with our own data structures. This relies on the LPI being
+ * mapped before.
+ */
+static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
+{
+	gpa_t pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);
+	struct vgic_irq *irq;
+	int last_byte_offset = -1;
+	int ret = 0;
+	u32 *intids;
+	int nr_irqs, i;
+	unsigned long flags;
+	u8 pendmask;
+
+	nr_irqs = vgic_copy_lpi_list(vcpu->kvm, vcpu, &intids);
+	if (nr_irqs < 0)
+		return nr_irqs;
+
+	for (i = 0; i < nr_irqs; i++) {
+		int byte_offset, bit_nr;
+
+		byte_offset = intids[i] / BITS_PER_BYTE;
+		bit_nr = intids[i] % BITS_PER_BYTE;
+
+		/*
+		 * For contiguously allocated LPIs chances are we just read
+		 * this very same byte in the last iteration. Reuse that.
+		 */
+		if (byte_offset != last_byte_offset) {
+			ret = kvm_read_guest_lock(vcpu->kvm,
+						  pendbase + byte_offset,
+						  &pendmask, 1);
+			if (ret) {
+				kfree(intids);
+				return ret;
+			}
+			last_byte_offset = byte_offset;
+		}
+
+		irq = vgic_get_irq(vcpu->kvm, NULL, intids[i]);
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		irq->pending_latch = pendmask & (1U << bit_nr);
+		vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	kfree(intids);
+
+	return ret;
+}
+
+static unsigned long vgic_mmio_read_its_typer(struct kvm *kvm,
+					      struct vgic_its *its,
+					      gpa_t addr, unsigned int len)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	u64 reg = GITS_TYPER_PLPIS;
+
+	/*
+	 * We use linear CPU numbers for redistributor addressing,
+	 * so GITS_TYPER.PTA is 0.
+	 * Also we force all PROPBASER registers to be the same, so
+	 * CommonLPIAff is 0 as well.
+	 * To avoid memory waste in the guest, we keep the number of IDBits and
+	 * DevBits low - as least for the time being.
+	 */
+	reg |= GIC_ENCODE_SZ(VITS_TYPER_DEVBITS, 5) << GITS_TYPER_DEVBITS_SHIFT;
+	reg |= GIC_ENCODE_SZ(VITS_TYPER_IDBITS, 5) << GITS_TYPER_IDBITS_SHIFT;
+	reg |= GIC_ENCODE_SZ(abi->ite_esz, 4) << GITS_TYPER_ITT_ENTRY_SIZE_SHIFT;
+
+	return extract_bytes(reg, addr & 7, len);
+}
+
+static unsigned long vgic_mmio_read_its_iidr(struct kvm *kvm,
+					     struct vgic_its *its,
+					     gpa_t addr, unsigned int len)
+{
+	u32 val;
+
+	val = (its->abi_rev << GITS_IIDR_REV_SHIFT) & GITS_IIDR_REV_MASK;
+	val |= (PRODUCT_ID_KVM << GITS_IIDR_PRODUCTID_SHIFT) | IMPLEMENTER_ARM;
+	return val;
+}
+
+static int vgic_mmio_uaccess_write_its_iidr(struct kvm *kvm,
+					    struct vgic_its *its,
+					    gpa_t addr, unsigned int len,
+					    unsigned long val)
+{
+	u32 rev = GITS_IIDR_REV(val);
+
+	if (rev >= NR_ITS_ABIS)
+		return -EINVAL;
+	return vgic_its_set_abi(its, rev);
+}
+
+static unsigned long vgic_mmio_read_its_idregs(struct kvm *kvm,
+					       struct vgic_its *its,
+					       gpa_t addr, unsigned int len)
+{
+	switch (addr & 0xffff) {
+	case GITS_PIDR0:
+		return 0x92;	/* part number, bits[7:0] */
+	case GITS_PIDR1:
+		return 0xb4;	/* part number, bits[11:8] */
+	case GITS_PIDR2:
+		return GIC_PIDR2_ARCH_GICv3 | 0x0b;
+	case GITS_PIDR4:
+		return 0x40;	/* This is a 64K software visible page */
+	/* The following are the ID registers for (any) GIC. */
+	case GITS_CIDR0:
+		return 0x0d;
+	case GITS_CIDR1:
+		return 0xf0;
+	case GITS_CIDR2:
+		return 0x05;
+	case GITS_CIDR3:
+		return 0xb1;
+	}
+
+	return 0;
+}
+
+static struct vgic_irq *__vgic_its_check_cache(struct vgic_dist *dist,
+					       phys_addr_t db,
+					       u32 devid, u32 eventid)
+{
+	struct vgic_translation_cache_entry *cte;
+
+	list_for_each_entry(cte, &dist->lpi_translation_cache, entry) {
+		/*
+		 * If we hit a NULL entry, there is nothing after this
+		 * point.
+		 */
+		if (!cte->irq)
+			break;
+
+		if (cte->db != db || cte->devid != devid ||
+		    cte->eventid != eventid)
+			continue;
+
+		/*
+		 * Move this entry to the head, as it is the most
+		 * recently used.
+		 */
+		if (!list_is_first(&cte->entry, &dist->lpi_translation_cache))
+			list_move(&cte->entry, &dist->lpi_translation_cache);
+
+		return cte->irq;
+	}
+
+	return NULL;
+}
+
+static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db,
+					     u32 devid, u32 eventid)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_irq *irq;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+
+	irq = __vgic_its_check_cache(dist, db, devid, eventid);
+	if (irq)
+		vgic_get_irq_kref(irq);
+
+	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+
+	return irq;
+}
+
+static void vgic_its_cache_translation(struct kvm *kvm, struct vgic_its *its,
+				       u32 devid, u32 eventid,
+				       struct vgic_irq *irq)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_translation_cache_entry *cte;
+	unsigned long flags;
+	phys_addr_t db;
+
+	/* Do not cache a directly injected interrupt */
+	if (irq->hw)
+		return;
+
+	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+
+	if (unlikely(list_empty(&dist->lpi_translation_cache)))
+		goto out;
+
+	/*
+	 * We could have raced with another CPU caching the same
+	 * translation behind our back, so let's check it is not in
+	 * already
+	 */
+	db = its->vgic_its_base + GITS_TRANSLATER;
+	if (__vgic_its_check_cache(dist, db, devid, eventid))
+		goto out;
+
+	/* Always reuse the last entry (LRU policy) */
+	cte = list_last_entry(&dist->lpi_translation_cache,
+			      typeof(*cte), entry);
+
+	/*
+	 * Caching the translation implies having an extra reference
+	 * to the interrupt, so drop the potential reference on what
+	 * was in the cache, and increment it on the new interrupt.
+	 */
+	if (cte->irq)
+		__vgic_put_lpi_locked(kvm, cte->irq);
+
+	vgic_get_irq_kref(irq);
+
+	cte->db		= db;
+	cte->devid	= devid;
+	cte->eventid	= eventid;
+	cte->irq	= irq;
+
+	/* Move the new translation to the head of the list */
+	list_move(&cte->entry, &dist->lpi_translation_cache);
+
+out:
+	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+}
+
+void vgic_its_invalidate_cache(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_translation_cache_entry *cte;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+
+	list_for_each_entry(cte, &dist->lpi_translation_cache, entry) {
+		/*
+		 * If we hit a NULL entry, there is nothing after this
+		 * point.
+		 */
+		if (!cte->irq)
+			break;
+
+		__vgic_put_lpi_locked(kvm, cte->irq);
+		cte->irq = NULL;
+	}
+
+	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+}
+
+int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
+			 u32 devid, u32 eventid, struct vgic_irq **irq)
+{
+	struct kvm_vcpu *vcpu;
+	struct its_ite *ite;
+
+	if (!its->enabled)
+		return -EBUSY;
+
+	ite = find_ite(its, devid, eventid);
+	if (!ite || !its_is_collection_mapped(ite->collection))
+		return E_ITS_INT_UNMAPPED_INTERRUPT;
+
+	vcpu = kvm_get_vcpu(kvm, ite->collection->target_addr);
+	if (!vcpu)
+		return E_ITS_INT_UNMAPPED_INTERRUPT;
+
+	if (!vgic_lpis_enabled(vcpu))
+		return -EBUSY;
+
+	vgic_its_cache_translation(kvm, its, devid, eventid, ite->irq);
+
+	*irq = ite->irq;
+	return 0;
+}
+
+struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi)
+{
+	u64 address;
+	struct kvm_io_device *kvm_io_dev;
+	struct vgic_io_device *iodev;
+
+	if (!vgic_has_its(kvm))
+		return ERR_PTR(-ENODEV);
+
+	if (!(msi->flags & KVM_MSI_VALID_DEVID))
+		return ERR_PTR(-EINVAL);
+
+	address = (u64)msi->address_hi << 32 | msi->address_lo;
+
+	kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
+	if (!kvm_io_dev)
+		return ERR_PTR(-EINVAL);
+
+	if (kvm_io_dev->ops != &kvm_io_gic_ops)
+		return ERR_PTR(-EINVAL);
+
+	iodev = container_of(kvm_io_dev, struct vgic_io_device, dev);
+	if (iodev->iodev_type != IODEV_ITS)
+		return ERR_PTR(-EINVAL);
+
+	return iodev->its;
+}
+
+/*
+ * Find the target VCPU and the LPI number for a given devid/eventid pair
+ * and make this IRQ pending, possibly injecting it.
+ * Must be called with the its_lock mutex held.
+ * Returns 0 on success, a positive error value for any ITS mapping
+ * related errors and negative error values for generic errors.
+ */
+static int vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
+				u32 devid, u32 eventid)
+{
+	struct vgic_irq *irq = NULL;
+	unsigned long flags;
+	int err;
+
+	err = vgic_its_resolve_lpi(kvm, its, devid, eventid, &irq);
+	if (err)
+		return err;
+
+	if (irq->hw)
+		return irq_set_irqchip_state(irq->host_irq,
+					     IRQCHIP_STATE_PENDING, true);
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	irq->pending_latch = true;
+	vgic_queue_irq_unlock(kvm, irq, flags);
+
+	return 0;
+}
+
+int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi)
+{
+	struct vgic_irq *irq;
+	unsigned long flags;
+	phys_addr_t db;
+
+	db = (u64)msi->address_hi << 32 | msi->address_lo;
+	irq = vgic_its_check_cache(kvm, db, msi->devid, msi->data);
+	if (!irq)
+		return -EWOULDBLOCK;
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	irq->pending_latch = true;
+	vgic_queue_irq_unlock(kvm, irq, flags);
+	vgic_put_irq(kvm, irq);
+
+	return 0;
+}
+
+/*
+ * Queries the KVM IO bus framework to get the ITS pointer from the given
+ * doorbell address.
+ * We then call vgic_its_trigger_msi() with the decoded data.
+ * According to the KVM_SIGNAL_MSI API description returns 1 on success.
+ */
+int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
+{
+	struct vgic_its *its;
+	int ret;
+
+	if (!vgic_its_inject_cached_translation(kvm, msi))
+		return 1;
+
+	its = vgic_msi_to_its(kvm, msi);
+	if (IS_ERR(its))
+		return PTR_ERR(its);
+
+	mutex_lock(&its->its_lock);
+	ret = vgic_its_trigger_msi(kvm, its, msi->devid, msi->data);
+	mutex_unlock(&its->its_lock);
+
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * KVM_SIGNAL_MSI demands a return value > 0 for success and 0
+	 * if the guest has blocked the MSI. So we map any LPI mapping
+	 * related error to that.
+	 */
+	if (ret)
+		return 0;
+	else
+		return 1;
+}
+
+/* Requires the its_lock to be held. */
+static void its_free_ite(struct kvm *kvm, struct its_ite *ite)
+{
+	list_del(&ite->ite_list);
+
+	/* This put matches the get in vgic_add_lpi. */
+	if (ite->irq) {
+		if (ite->irq->hw)
+			WARN_ON(its_unmap_vlpi(ite->irq->host_irq));
+
+		vgic_put_irq(kvm, ite->irq);
+	}
+
+	kfree(ite);
+}
+
+static u64 its_cmd_mask_field(u64 *its_cmd, int word, int shift, int size)
+{
+	return (le64_to_cpu(its_cmd[word]) >> shift) & (BIT_ULL(size) - 1);
+}
+
+#define its_cmd_get_command(cmd)	its_cmd_mask_field(cmd, 0,  0,  8)
+#define its_cmd_get_deviceid(cmd)	its_cmd_mask_field(cmd, 0, 32, 32)
+#define its_cmd_get_size(cmd)		(its_cmd_mask_field(cmd, 1,  0,  5) + 1)
+#define its_cmd_get_id(cmd)		its_cmd_mask_field(cmd, 1,  0, 32)
+#define its_cmd_get_physical_id(cmd)	its_cmd_mask_field(cmd, 1, 32, 32)
+#define its_cmd_get_collection(cmd)	its_cmd_mask_field(cmd, 2,  0, 16)
+#define its_cmd_get_ittaddr(cmd)	(its_cmd_mask_field(cmd, 2,  8, 44) << 8)
+#define its_cmd_get_target_addr(cmd)	its_cmd_mask_field(cmd, 2, 16, 32)
+#define its_cmd_get_validbit(cmd)	its_cmd_mask_field(cmd, 2, 63,  1)
+
+/*
+ * The DISCARD command frees an Interrupt Translation Table Entry (ITTE).
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_discard(struct kvm *kvm, struct vgic_its *its,
+				       u64 *its_cmd)
+{
+	u32 device_id = its_cmd_get_deviceid(its_cmd);
+	u32 event_id = its_cmd_get_id(its_cmd);
+	struct its_ite *ite;
+
+	ite = find_ite(its, device_id, event_id);
+	if (ite && its_is_collection_mapped(ite->collection)) {
+		/*
+		 * Though the spec talks about removing the pending state, we
+		 * don't bother here since we clear the ITTE anyway and the
+		 * pending state is a property of the ITTE struct.
+		 */
+		vgic_its_invalidate_cache(kvm);
+
+		its_free_ite(kvm, ite);
+		return 0;
+	}
+
+	return E_ITS_DISCARD_UNMAPPED_INTERRUPT;
+}
+
+/*
+ * The MOVI command moves an ITTE to a different collection.
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_movi(struct kvm *kvm, struct vgic_its *its,
+				    u64 *its_cmd)
+{
+	u32 device_id = its_cmd_get_deviceid(its_cmd);
+	u32 event_id = its_cmd_get_id(its_cmd);
+	u32 coll_id = its_cmd_get_collection(its_cmd);
+	struct kvm_vcpu *vcpu;
+	struct its_ite *ite;
+	struct its_collection *collection;
+
+	ite = find_ite(its, device_id, event_id);
+	if (!ite)
+		return E_ITS_MOVI_UNMAPPED_INTERRUPT;
+
+	if (!its_is_collection_mapped(ite->collection))
+		return E_ITS_MOVI_UNMAPPED_COLLECTION;
+
+	collection = find_collection(its, coll_id);
+	if (!its_is_collection_mapped(collection))
+		return E_ITS_MOVI_UNMAPPED_COLLECTION;
+
+	ite->collection = collection;
+	vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+
+	vgic_its_invalidate_cache(kvm);
+
+	return update_affinity(ite->irq, vcpu);
+}
+
+static bool __is_visible_gfn_locked(struct vgic_its *its, gpa_t gpa)
+{
+	gfn_t gfn = gpa >> PAGE_SHIFT;
+	int idx;
+	bool ret;
+
+	idx = srcu_read_lock(&its->dev->kvm->srcu);
+	ret = kvm_is_visible_gfn(its->dev->kvm, gfn);
+	srcu_read_unlock(&its->dev->kvm->srcu, idx);
+	return ret;
+}
+
+/*
+ * Check whether an ID can be stored into the corresponding guest table.
+ * For a direct table this is pretty easy, but gets a bit nasty for
+ * indirect tables. We check whether the resulting guest physical address
+ * is actually valid (covered by a memslot and guest accessible).
+ * For this we have to read the respective first level entry.
+ */
+static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id,
+			      gpa_t *eaddr)
+{
+	int l1_tbl_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
+	u64 indirect_ptr, type = GITS_BASER_TYPE(baser);
+	phys_addr_t base = GITS_BASER_ADDR_48_to_52(baser);
+	int esz = GITS_BASER_ENTRY_SIZE(baser);
+	int index;
+
+	switch (type) {
+	case GITS_BASER_TYPE_DEVICE:
+		if (id >= BIT_ULL(VITS_TYPER_DEVBITS))
+			return false;
+		break;
+	case GITS_BASER_TYPE_COLLECTION:
+		/* as GITS_TYPER.CIL == 0, ITS supports 16-bit collection ID */
+		if (id >= BIT_ULL(16))
+			return false;
+		break;
+	default:
+		return false;
+	}
+
+	if (!(baser & GITS_BASER_INDIRECT)) {
+		phys_addr_t addr;
+
+		if (id >= (l1_tbl_size / esz))
+			return false;
+
+		addr = base + id * esz;
+
+		if (eaddr)
+			*eaddr = addr;
+
+		return __is_visible_gfn_locked(its, addr);
+	}
+
+	/* calculate and check the index into the 1st level */
+	index = id / (SZ_64K / esz);
+	if (index >= (l1_tbl_size / sizeof(u64)))
+		return false;
+
+	/* Each 1st level entry is represented by a 64-bit value. */
+	if (kvm_read_guest_lock(its->dev->kvm,
+			   base + index * sizeof(indirect_ptr),
+			   &indirect_ptr, sizeof(indirect_ptr)))
+		return false;
+
+	indirect_ptr = le64_to_cpu(indirect_ptr);
+
+	/* check the valid bit of the first level entry */
+	if (!(indirect_ptr & BIT_ULL(63)))
+		return false;
+
+	/* Mask the guest physical address and calculate the frame number. */
+	indirect_ptr &= GENMASK_ULL(51, 16);
+
+	/* Find the address of the actual entry */
+	index = id % (SZ_64K / esz);
+	indirect_ptr += index * esz;
+
+	if (eaddr)
+		*eaddr = indirect_ptr;
+
+	return __is_visible_gfn_locked(its, indirect_ptr);
+}
+
+/*
+ * Check whether an event ID can be stored in the corresponding Interrupt
+ * Translation Table, which starts at device->itt_addr.
+ */
+static bool vgic_its_check_event_id(struct vgic_its *its, struct its_device *device,
+		u32 event_id)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	int ite_esz = abi->ite_esz;
+	gpa_t gpa;
+
+	/* max table size is: BIT_ULL(device->num_eventid_bits) * ite_esz */
+	if (event_id >= BIT_ULL(device->num_eventid_bits))
+		return false;
+
+	gpa = device->itt_addr + event_id * ite_esz;
+	return __is_visible_gfn_locked(its, gpa);
+}
+
+/*
+ * Add a new collection into the ITS collection table.
+ * Returns 0 on success, and a negative error value for generic errors.
+ */
+static int vgic_its_alloc_collection(struct vgic_its *its,
+				     struct its_collection **colp,
+				     u32 coll_id)
+{
+	struct its_collection *collection;
+
+	collection = kzalloc(sizeof(*collection), GFP_KERNEL_ACCOUNT);
+	if (!collection)
+		return -ENOMEM;
+
+	collection->collection_id = coll_id;
+	collection->target_addr = COLLECTION_NOT_MAPPED;
+
+	list_add_tail(&collection->coll_list, &its->collection_list);
+	*colp = collection;
+
+	return 0;
+}
+
+static void vgic_its_free_collection(struct vgic_its *its, u32 coll_id)
+{
+	struct its_collection *collection;
+	struct its_device *device;
+	struct its_ite *ite;
+
+	/*
+	 * Clearing the mapping for that collection ID removes the
+	 * entry from the list. If there wasn't any before, we can
+	 * go home early.
+	 */
+	collection = find_collection(its, coll_id);
+	if (!collection)
+		return;
+
+	for_each_lpi_its(device, ite, its)
+		if (ite->collection &&
+		    ite->collection->collection_id == coll_id)
+			ite->collection = NULL;
+
+	list_del(&collection->coll_list);
+	kfree(collection);
+}
+
+/* Must be called with its_lock mutex held */
+static struct its_ite *vgic_its_alloc_ite(struct its_device *device,
+					  struct its_collection *collection,
+					  u32 event_id)
+{
+	struct its_ite *ite;
+
+	ite = kzalloc(sizeof(*ite), GFP_KERNEL_ACCOUNT);
+	if (!ite)
+		return ERR_PTR(-ENOMEM);
+
+	ite->event_id	= event_id;
+	ite->collection = collection;
+
+	list_add_tail(&ite->ite_list, &device->itt_head);
+	return ite;
+}
+
+/*
+ * The MAPTI and MAPI commands map LPIs to ITTEs.
+ * Must be called with its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
+				    u64 *its_cmd)
+{
+	u32 device_id = its_cmd_get_deviceid(its_cmd);
+	u32 event_id = its_cmd_get_id(its_cmd);
+	u32 coll_id = its_cmd_get_collection(its_cmd);
+	struct its_ite *ite;
+	struct kvm_vcpu *vcpu = NULL;
+	struct its_device *device;
+	struct its_collection *collection, *new_coll = NULL;
+	struct vgic_irq *irq;
+	int lpi_nr;
+
+	device = find_its_device(its, device_id);
+	if (!device)
+		return E_ITS_MAPTI_UNMAPPED_DEVICE;
+
+	if (!vgic_its_check_event_id(its, device, event_id))
+		return E_ITS_MAPTI_ID_OOR;
+
+	if (its_cmd_get_command(its_cmd) == GITS_CMD_MAPTI)
+		lpi_nr = its_cmd_get_physical_id(its_cmd);
+	else
+		lpi_nr = event_id;
+	if (lpi_nr < GIC_LPI_OFFSET ||
+	    lpi_nr >= max_lpis_propbaser(kvm->arch.vgic.propbaser))
+		return E_ITS_MAPTI_PHYSICALID_OOR;
+
+	/* If there is an existing mapping, behavior is UNPREDICTABLE. */
+	if (find_ite(its, device_id, event_id))
+		return 0;
+
+	collection = find_collection(its, coll_id);
+	if (!collection) {
+		int ret;
+
+		if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL))
+			return E_ITS_MAPC_COLLECTION_OOR;
+
+		ret = vgic_its_alloc_collection(its, &collection, coll_id);
+		if (ret)
+			return ret;
+		new_coll = collection;
+	}
+
+	ite = vgic_its_alloc_ite(device, collection, event_id);
+	if (IS_ERR(ite)) {
+		if (new_coll)
+			vgic_its_free_collection(its, coll_id);
+		return PTR_ERR(ite);
+	}
+
+	if (its_is_collection_mapped(collection))
+		vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+
+	irq = vgic_add_lpi(kvm, lpi_nr, vcpu);
+	if (IS_ERR(irq)) {
+		if (new_coll)
+			vgic_its_free_collection(its, coll_id);
+		its_free_ite(kvm, ite);
+		return PTR_ERR(irq);
+	}
+	ite->irq = irq;
+
+	return 0;
+}
+
+/* Requires the its_lock to be held. */
+static void vgic_its_free_device(struct kvm *kvm, struct its_device *device)
+{
+	struct its_ite *ite, *temp;
+
+	/*
+	 * The spec says that unmapping a device with still valid
+	 * ITTEs associated is UNPREDICTABLE. We remove all ITTEs,
+	 * since we cannot leave the memory unreferenced.
+	 */
+	list_for_each_entry_safe(ite, temp, &device->itt_head, ite_list)
+		its_free_ite(kvm, ite);
+
+	vgic_its_invalidate_cache(kvm);
+
+	list_del(&device->dev_list);
+	kfree(device);
+}
+
+/* its lock must be held */
+static void vgic_its_free_device_list(struct kvm *kvm, struct vgic_its *its)
+{
+	struct its_device *cur, *temp;
+
+	list_for_each_entry_safe(cur, temp, &its->device_list, dev_list)
+		vgic_its_free_device(kvm, cur);
+}
+
+/* its lock must be held */
+static void vgic_its_free_collection_list(struct kvm *kvm, struct vgic_its *its)
+{
+	struct its_collection *cur, *temp;
+
+	list_for_each_entry_safe(cur, temp, &its->collection_list, coll_list)
+		vgic_its_free_collection(its, cur->collection_id);
+}
+
+/* Must be called with its_lock mutex held */
+static struct its_device *vgic_its_alloc_device(struct vgic_its *its,
+						u32 device_id, gpa_t itt_addr,
+						u8 num_eventid_bits)
+{
+	struct its_device *device;
+
+	device = kzalloc(sizeof(*device), GFP_KERNEL_ACCOUNT);
+	if (!device)
+		return ERR_PTR(-ENOMEM);
+
+	device->device_id = device_id;
+	device->itt_addr = itt_addr;
+	device->num_eventid_bits = num_eventid_bits;
+	INIT_LIST_HEAD(&device->itt_head);
+
+	list_add_tail(&device->dev_list, &its->device_list);
+	return device;
+}
+
+/*
+ * MAPD maps or unmaps a device ID to Interrupt Translation Tables (ITTs).
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its,
+				    u64 *its_cmd)
+{
+	u32 device_id = its_cmd_get_deviceid(its_cmd);
+	bool valid = its_cmd_get_validbit(its_cmd);
+	u8 num_eventid_bits = its_cmd_get_size(its_cmd);
+	gpa_t itt_addr = its_cmd_get_ittaddr(its_cmd);
+	struct its_device *device;
+
+	if (!vgic_its_check_id(its, its->baser_device_table, device_id, NULL))
+		return E_ITS_MAPD_DEVICE_OOR;
+
+	if (valid && num_eventid_bits > VITS_TYPER_IDBITS)
+		return E_ITS_MAPD_ITTSIZE_OOR;
+
+	device = find_its_device(its, device_id);
+
+	/*
+	 * The spec says that calling MAPD on an already mapped device
+	 * invalidates all cached data for this device. We implement this
+	 * by removing the mapping and re-establishing it.
+	 */
+	if (device)
+		vgic_its_free_device(kvm, device);
+
+	/*
+	 * The spec does not say whether unmapping a not-mapped device
+	 * is an error, so we are done in any case.
+	 */
+	if (!valid)
+		return 0;
+
+	device = vgic_its_alloc_device(its, device_id, itt_addr,
+				       num_eventid_bits);
+
+	return PTR_ERR_OR_ZERO(device);
+}
+
+/*
+ * The MAPC command maps collection IDs to redistributors.
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_mapc(struct kvm *kvm, struct vgic_its *its,
+				    u64 *its_cmd)
+{
+	u16 coll_id;
+	u32 target_addr;
+	struct its_collection *collection;
+	bool valid;
+
+	valid = its_cmd_get_validbit(its_cmd);
+	coll_id = its_cmd_get_collection(its_cmd);
+	target_addr = its_cmd_get_target_addr(its_cmd);
+
+	if (target_addr >= atomic_read(&kvm->online_vcpus))
+		return E_ITS_MAPC_PROCNUM_OOR;
+
+	if (!valid) {
+		vgic_its_free_collection(its, coll_id);
+		vgic_its_invalidate_cache(kvm);
+	} else {
+		collection = find_collection(its, coll_id);
+
+		if (!collection) {
+			int ret;
+
+			if (!vgic_its_check_id(its, its->baser_coll_table,
+						coll_id, NULL))
+				return E_ITS_MAPC_COLLECTION_OOR;
+
+			ret = vgic_its_alloc_collection(its, &collection,
+							coll_id);
+			if (ret)
+				return ret;
+			collection->target_addr = target_addr;
+		} else {
+			collection->target_addr = target_addr;
+			update_affinity_collection(kvm, its, collection);
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * The CLEAR command removes the pending state for a particular LPI.
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_clear(struct kvm *kvm, struct vgic_its *its,
+				     u64 *its_cmd)
+{
+	u32 device_id = its_cmd_get_deviceid(its_cmd);
+	u32 event_id = its_cmd_get_id(its_cmd);
+	struct its_ite *ite;
+
+
+	ite = find_ite(its, device_id, event_id);
+	if (!ite)
+		return E_ITS_CLEAR_UNMAPPED_INTERRUPT;
+
+	ite->irq->pending_latch = false;
+
+	if (ite->irq->hw)
+		return irq_set_irqchip_state(ite->irq->host_irq,
+					     IRQCHIP_STATE_PENDING, false);
+
+	return 0;
+}
+
+int vgic_its_inv_lpi(struct kvm *kvm, struct vgic_irq *irq)
+{
+	return update_lpi_config(kvm, irq, NULL, true);
+}
+
+/*
+ * The INV command syncs the configuration bits from the memory table.
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_inv(struct kvm *kvm, struct vgic_its *its,
+				   u64 *its_cmd)
+{
+	u32 device_id = its_cmd_get_deviceid(its_cmd);
+	u32 event_id = its_cmd_get_id(its_cmd);
+	struct its_ite *ite;
+
+
+	ite = find_ite(its, device_id, event_id);
+	if (!ite)
+		return E_ITS_INV_UNMAPPED_INTERRUPT;
+
+	return vgic_its_inv_lpi(kvm, ite->irq);
+}
+
+/**
+ * vgic_its_invall - invalidate all LPIs targetting a given vcpu
+ * @vcpu: the vcpu for which the RD is targetted by an invalidation
+ *
+ * Contrary to the INVALL command, this targets a RD instead of a
+ * collection, and we don't need to hold the its_lock, since no ITS is
+ * involved here.
+ */
+int vgic_its_invall(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	int irq_count, i = 0;
+	u32 *intids;
+
+	irq_count = vgic_copy_lpi_list(kvm, vcpu, &intids);
+	if (irq_count < 0)
+		return irq_count;
+
+	for (i = 0; i < irq_count; i++) {
+		struct vgic_irq *irq = vgic_get_irq(kvm, NULL, intids[i]);
+		if (!irq)
+			continue;
+		update_lpi_config(kvm, irq, vcpu, false);
+		vgic_put_irq(kvm, irq);
+	}
+
+	kfree(intids);
+
+	if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.its_vm)
+		its_invall_vpe(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe);
+
+	return 0;
+}
+
+/*
+ * The INVALL command requests flushing of all IRQ data in this collection.
+ * Find the VCPU mapped to that collection, then iterate over the VM's list
+ * of mapped LPIs and update the configuration for each IRQ which targets
+ * the specified vcpu. The configuration will be read from the in-memory
+ * configuration table.
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_invall(struct kvm *kvm, struct vgic_its *its,
+				      u64 *its_cmd)
+{
+	u32 coll_id = its_cmd_get_collection(its_cmd);
+	struct its_collection *collection;
+	struct kvm_vcpu *vcpu;
+
+	collection = find_collection(its, coll_id);
+	if (!its_is_collection_mapped(collection))
+		return E_ITS_INVALL_UNMAPPED_COLLECTION;
+
+	vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+	vgic_its_invall(vcpu);
+
+	return 0;
+}
+
+/*
+ * The MOVALL command moves the pending state of all IRQs targeting one
+ * redistributor to another. We don't hold the pending state in the VCPUs,
+ * but in the IRQs instead, so there is really not much to do for us here.
+ * However the spec says that no IRQ must target the old redistributor
+ * afterwards, so we make sure that no LPI is using the associated target_vcpu.
+ * This command affects all LPIs in the system that target that redistributor.
+ */
+static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its,
+				      u64 *its_cmd)
+{
+	u32 target1_addr = its_cmd_get_target_addr(its_cmd);
+	u32 target2_addr = its_cmd_mask_field(its_cmd, 3, 16, 32);
+	struct kvm_vcpu *vcpu1, *vcpu2;
+	struct vgic_irq *irq;
+	u32 *intids;
+	int irq_count, i;
+
+	if (target1_addr >= atomic_read(&kvm->online_vcpus) ||
+	    target2_addr >= atomic_read(&kvm->online_vcpus))
+		return E_ITS_MOVALL_PROCNUM_OOR;
+
+	if (target1_addr == target2_addr)
+		return 0;
+
+	vcpu1 = kvm_get_vcpu(kvm, target1_addr);
+	vcpu2 = kvm_get_vcpu(kvm, target2_addr);
+
+	irq_count = vgic_copy_lpi_list(kvm, vcpu1, &intids);
+	if (irq_count < 0)
+		return irq_count;
+
+	for (i = 0; i < irq_count; i++) {
+		irq = vgic_get_irq(kvm, NULL, intids[i]);
+
+		update_affinity(irq, vcpu2);
+
+		vgic_put_irq(kvm, irq);
+	}
+
+	vgic_its_invalidate_cache(kvm);
+
+	kfree(intids);
+	return 0;
+}
+
+/*
+ * The INT command injects the LPI associated with that DevID/EvID pair.
+ * Must be called with the its_lock mutex held.
+ */
+static int vgic_its_cmd_handle_int(struct kvm *kvm, struct vgic_its *its,
+				   u64 *its_cmd)
+{
+	u32 msi_data = its_cmd_get_id(its_cmd);
+	u64 msi_devid = its_cmd_get_deviceid(its_cmd);
+
+	return vgic_its_trigger_msi(kvm, its, msi_devid, msi_data);
+}
+
+/*
+ * This function is called with the its_cmd lock held, but the ITS data
+ * structure lock dropped.
+ */
+static int vgic_its_handle_command(struct kvm *kvm, struct vgic_its *its,
+				   u64 *its_cmd)
+{
+	int ret = -ENODEV;
+
+	mutex_lock(&its->its_lock);
+	switch (its_cmd_get_command(its_cmd)) {
+	case GITS_CMD_MAPD:
+		ret = vgic_its_cmd_handle_mapd(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_MAPC:
+		ret = vgic_its_cmd_handle_mapc(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_MAPI:
+		ret = vgic_its_cmd_handle_mapi(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_MAPTI:
+		ret = vgic_its_cmd_handle_mapi(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_MOVI:
+		ret = vgic_its_cmd_handle_movi(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_DISCARD:
+		ret = vgic_its_cmd_handle_discard(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_CLEAR:
+		ret = vgic_its_cmd_handle_clear(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_MOVALL:
+		ret = vgic_its_cmd_handle_movall(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_INT:
+		ret = vgic_its_cmd_handle_int(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_INV:
+		ret = vgic_its_cmd_handle_inv(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_INVALL:
+		ret = vgic_its_cmd_handle_invall(kvm, its, its_cmd);
+		break;
+	case GITS_CMD_SYNC:
+		/* we ignore this command: we are in sync all of the time */
+		ret = 0;
+		break;
+	}
+	mutex_unlock(&its->its_lock);
+
+	return ret;
+}
+
+static u64 vgic_sanitise_its_baser(u64 reg)
+{
+	reg = vgic_sanitise_field(reg, GITS_BASER_SHAREABILITY_MASK,
+				  GITS_BASER_SHAREABILITY_SHIFT,
+				  vgic_sanitise_shareability);
+	reg = vgic_sanitise_field(reg, GITS_BASER_INNER_CACHEABILITY_MASK,
+				  GITS_BASER_INNER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_inner_cacheability);
+	reg = vgic_sanitise_field(reg, GITS_BASER_OUTER_CACHEABILITY_MASK,
+				  GITS_BASER_OUTER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_outer_cacheability);
+
+	/* We support only one (ITS) page size: 64K */
+	reg = (reg & ~GITS_BASER_PAGE_SIZE_MASK) | GITS_BASER_PAGE_SIZE_64K;
+
+	return reg;
+}
+
+static u64 vgic_sanitise_its_cbaser(u64 reg)
+{
+	reg = vgic_sanitise_field(reg, GITS_CBASER_SHAREABILITY_MASK,
+				  GITS_CBASER_SHAREABILITY_SHIFT,
+				  vgic_sanitise_shareability);
+	reg = vgic_sanitise_field(reg, GITS_CBASER_INNER_CACHEABILITY_MASK,
+				  GITS_CBASER_INNER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_inner_cacheability);
+	reg = vgic_sanitise_field(reg, GITS_CBASER_OUTER_CACHEABILITY_MASK,
+				  GITS_CBASER_OUTER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_outer_cacheability);
+
+	/* Sanitise the physical address to be 64k aligned. */
+	reg &= ~GENMASK_ULL(15, 12);
+
+	return reg;
+}
+
+static unsigned long vgic_mmio_read_its_cbaser(struct kvm *kvm,
+					       struct vgic_its *its,
+					       gpa_t addr, unsigned int len)
+{
+	return extract_bytes(its->cbaser, addr & 7, len);
+}
+
+static void vgic_mmio_write_its_cbaser(struct kvm *kvm, struct vgic_its *its,
+				       gpa_t addr, unsigned int len,
+				       unsigned long val)
+{
+	/* When GITS_CTLR.Enable is 1, this register is RO. */
+	if (its->enabled)
+		return;
+
+	mutex_lock(&its->cmd_lock);
+	its->cbaser = update_64bit_reg(its->cbaser, addr & 7, len, val);
+	its->cbaser = vgic_sanitise_its_cbaser(its->cbaser);
+	its->creadr = 0;
+	/*
+	 * CWRITER is architecturally UNKNOWN on reset, but we need to reset
+	 * it to CREADR to make sure we start with an empty command buffer.
+	 */
+	its->cwriter = its->creadr;
+	mutex_unlock(&its->cmd_lock);
+}
+
+#define ITS_CMD_BUFFER_SIZE(baser)	((((baser) & 0xff) + 1) << 12)
+#define ITS_CMD_SIZE			32
+#define ITS_CMD_OFFSET(reg)		((reg) & GENMASK(19, 5))
+
+/* Must be called with the cmd_lock held. */
+static void vgic_its_process_commands(struct kvm *kvm, struct vgic_its *its)
+{
+	gpa_t cbaser;
+	u64 cmd_buf[4];
+
+	/* Commands are only processed when the ITS is enabled. */
+	if (!its->enabled)
+		return;
+
+	cbaser = GITS_CBASER_ADDRESS(its->cbaser);
+
+	while (its->cwriter != its->creadr) {
+		int ret = kvm_read_guest_lock(kvm, cbaser + its->creadr,
+					      cmd_buf, ITS_CMD_SIZE);
+		/*
+		 * If kvm_read_guest() fails, this could be due to the guest
+		 * programming a bogus value in CBASER or something else going
+		 * wrong from which we cannot easily recover.
+		 * According to section 6.3.2 in the GICv3 spec we can just
+		 * ignore that command then.
+		 */
+		if (!ret)
+			vgic_its_handle_command(kvm, its, cmd_buf);
+
+		its->creadr += ITS_CMD_SIZE;
+		if (its->creadr == ITS_CMD_BUFFER_SIZE(its->cbaser))
+			its->creadr = 0;
+	}
+}
+
+/*
+ * By writing to CWRITER the guest announces new commands to be processed.
+ * To avoid any races in the first place, we take the its_cmd lock, which
+ * protects our ring buffer variables, so that there is only one user
+ * per ITS handling commands at a given time.
+ */
+static void vgic_mmio_write_its_cwriter(struct kvm *kvm, struct vgic_its *its,
+					gpa_t addr, unsigned int len,
+					unsigned long val)
+{
+	u64 reg;
+
+	if (!its)
+		return;
+
+	mutex_lock(&its->cmd_lock);
+
+	reg = update_64bit_reg(its->cwriter, addr & 7, len, val);
+	reg = ITS_CMD_OFFSET(reg);
+	if (reg >= ITS_CMD_BUFFER_SIZE(its->cbaser)) {
+		mutex_unlock(&its->cmd_lock);
+		return;
+	}
+	its->cwriter = reg;
+
+	vgic_its_process_commands(kvm, its);
+
+	mutex_unlock(&its->cmd_lock);
+}
+
+static unsigned long vgic_mmio_read_its_cwriter(struct kvm *kvm,
+						struct vgic_its *its,
+						gpa_t addr, unsigned int len)
+{
+	return extract_bytes(its->cwriter, addr & 0x7, len);
+}
+
+static unsigned long vgic_mmio_read_its_creadr(struct kvm *kvm,
+					       struct vgic_its *its,
+					       gpa_t addr, unsigned int len)
+{
+	return extract_bytes(its->creadr, addr & 0x7, len);
+}
+
+static int vgic_mmio_uaccess_write_its_creadr(struct kvm *kvm,
+					      struct vgic_its *its,
+					      gpa_t addr, unsigned int len,
+					      unsigned long val)
+{
+	u32 cmd_offset;
+	int ret = 0;
+
+	mutex_lock(&its->cmd_lock);
+
+	if (its->enabled) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	cmd_offset = ITS_CMD_OFFSET(val);
+	if (cmd_offset >= ITS_CMD_BUFFER_SIZE(its->cbaser)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	its->creadr = cmd_offset;
+out:
+	mutex_unlock(&its->cmd_lock);
+	return ret;
+}
+
+#define BASER_INDEX(addr) (((addr) / sizeof(u64)) & 0x7)
+static unsigned long vgic_mmio_read_its_baser(struct kvm *kvm,
+					      struct vgic_its *its,
+					      gpa_t addr, unsigned int len)
+{
+	u64 reg;
+
+	switch (BASER_INDEX(addr)) {
+	case 0:
+		reg = its->baser_device_table;
+		break;
+	case 1:
+		reg = its->baser_coll_table;
+		break;
+	default:
+		reg = 0;
+		break;
+	}
+
+	return extract_bytes(reg, addr & 7, len);
+}
+
+#define GITS_BASER_RO_MASK	(GENMASK_ULL(52, 48) | GENMASK_ULL(58, 56))
+static void vgic_mmio_write_its_baser(struct kvm *kvm,
+				      struct vgic_its *its,
+				      gpa_t addr, unsigned int len,
+				      unsigned long val)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	u64 entry_size, table_type;
+	u64 reg, *regptr, clearbits = 0;
+
+	/* When GITS_CTLR.Enable is 1, we ignore write accesses. */
+	if (its->enabled)
+		return;
+
+	switch (BASER_INDEX(addr)) {
+	case 0:
+		regptr = &its->baser_device_table;
+		entry_size = abi->dte_esz;
+		table_type = GITS_BASER_TYPE_DEVICE;
+		break;
+	case 1:
+		regptr = &its->baser_coll_table;
+		entry_size = abi->cte_esz;
+		table_type = GITS_BASER_TYPE_COLLECTION;
+		clearbits = GITS_BASER_INDIRECT;
+		break;
+	default:
+		return;
+	}
+
+	reg = update_64bit_reg(*regptr, addr & 7, len, val);
+	reg &= ~GITS_BASER_RO_MASK;
+	reg &= ~clearbits;
+
+	reg |= (entry_size - 1) << GITS_BASER_ENTRY_SIZE_SHIFT;
+	reg |= table_type << GITS_BASER_TYPE_SHIFT;
+	reg = vgic_sanitise_its_baser(reg);
+
+	*regptr = reg;
+
+	if (!(reg & GITS_BASER_VALID)) {
+		/* Take the its_lock to prevent a race with a save/restore */
+		mutex_lock(&its->its_lock);
+		switch (table_type) {
+		case GITS_BASER_TYPE_DEVICE:
+			vgic_its_free_device_list(kvm, its);
+			break;
+		case GITS_BASER_TYPE_COLLECTION:
+			vgic_its_free_collection_list(kvm, its);
+			break;
+		}
+		mutex_unlock(&its->its_lock);
+	}
+}
+
+static unsigned long vgic_mmio_read_its_ctlr(struct kvm *vcpu,
+					     struct vgic_its *its,
+					     gpa_t addr, unsigned int len)
+{
+	u32 reg = 0;
+
+	mutex_lock(&its->cmd_lock);
+	if (its->creadr == its->cwriter)
+		reg |= GITS_CTLR_QUIESCENT;
+	if (its->enabled)
+		reg |= GITS_CTLR_ENABLE;
+	mutex_unlock(&its->cmd_lock);
+
+	return reg;
+}
+
+static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	mutex_lock(&its->cmd_lock);
+
+	/*
+	 * It is UNPREDICTABLE to enable the ITS if any of the CBASER or
+	 * device/collection BASER are invalid
+	 */
+	if (!its->enabled && (val & GITS_CTLR_ENABLE) &&
+		(!(its->baser_device_table & GITS_BASER_VALID) ||
+		 !(its->baser_coll_table & GITS_BASER_VALID) ||
+		 !(its->cbaser & GITS_CBASER_VALID)))
+		goto out;
+
+	its->enabled = !!(val & GITS_CTLR_ENABLE);
+	if (!its->enabled)
+		vgic_its_invalidate_cache(kvm);
+
+	/*
+	 * Try to process any pending commands. This function bails out early
+	 * if the ITS is disabled or no commands have been queued.
+	 */
+	vgic_its_process_commands(kvm, its);
+
+out:
+	mutex_unlock(&its->cmd_lock);
+}
+
+#define REGISTER_ITS_DESC(off, rd, wr, length, acc)		\
+{								\
+	.reg_offset = off,					\
+	.len = length,						\
+	.access_flags = acc,					\
+	.its_read = rd,						\
+	.its_write = wr,					\
+}
+
+#define REGISTER_ITS_DESC_UACCESS(off, rd, wr, uwr, length, acc)\
+{								\
+	.reg_offset = off,					\
+	.len = length,						\
+	.access_flags = acc,					\
+	.its_read = rd,						\
+	.its_write = wr,					\
+	.uaccess_its_write = uwr,				\
+}
+
+static void its_mmio_write_wi(struct kvm *kvm, struct vgic_its *its,
+			      gpa_t addr, unsigned int len, unsigned long val)
+{
+	/* Ignore */
+}
+
+static struct vgic_register_region its_registers[] = {
+	REGISTER_ITS_DESC(GITS_CTLR,
+		vgic_mmio_read_its_ctlr, vgic_mmio_write_its_ctlr, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_ITS_DESC_UACCESS(GITS_IIDR,
+		vgic_mmio_read_its_iidr, its_mmio_write_wi,
+		vgic_mmio_uaccess_write_its_iidr, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_ITS_DESC(GITS_TYPER,
+		vgic_mmio_read_its_typer, its_mmio_write_wi, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_ITS_DESC(GITS_CBASER,
+		vgic_mmio_read_its_cbaser, vgic_mmio_write_its_cbaser, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_ITS_DESC(GITS_CWRITER,
+		vgic_mmio_read_its_cwriter, vgic_mmio_write_its_cwriter, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_ITS_DESC_UACCESS(GITS_CREADR,
+		vgic_mmio_read_its_creadr, its_mmio_write_wi,
+		vgic_mmio_uaccess_write_its_creadr, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_ITS_DESC(GITS_BASER,
+		vgic_mmio_read_its_baser, vgic_mmio_write_its_baser, 0x40,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_ITS_DESC(GITS_IDREGS_BASE,
+		vgic_mmio_read_its_idregs, its_mmio_write_wi, 0x30,
+		VGIC_ACCESS_32bit),
+};
+
+/* This is called on setting the LPI enable bit in the redistributor. */
+void vgic_enable_lpis(struct kvm_vcpu *vcpu)
+{
+	if (!(vcpu->arch.vgic_cpu.pendbaser & GICR_PENDBASER_PTZ))
+		its_sync_lpi_pending_table(vcpu);
+}
+
+static int vgic_register_its_iodev(struct kvm *kvm, struct vgic_its *its,
+				   u64 addr)
+{
+	struct vgic_io_device *iodev = &its->iodev;
+	int ret;
+
+	mutex_lock(&kvm->slots_lock);
+	if (!IS_VGIC_ADDR_UNDEF(its->vgic_its_base)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	its->vgic_its_base = addr;
+	iodev->regions = its_registers;
+	iodev->nr_regions = ARRAY_SIZE(its_registers);
+	kvm_iodevice_init(&iodev->dev, &kvm_io_gic_ops);
+
+	iodev->base_addr = its->vgic_its_base;
+	iodev->iodev_type = IODEV_ITS;
+	iodev->its = its;
+	ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, iodev->base_addr,
+				      KVM_VGIC_V3_ITS_SIZE, &iodev->dev);
+out:
+	mutex_unlock(&kvm->slots_lock);
+
+	return ret;
+}
+
+/* Default is 16 cached LPIs per vcpu */
+#define LPI_DEFAULT_PCPU_CACHE_SIZE	16
+
+void vgic_lpi_translation_cache_init(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	unsigned int sz;
+	int i;
+
+	if (!list_empty(&dist->lpi_translation_cache))
+		return;
+
+	sz = atomic_read(&kvm->online_vcpus) * LPI_DEFAULT_PCPU_CACHE_SIZE;
+
+	for (i = 0; i < sz; i++) {
+		struct vgic_translation_cache_entry *cte;
+
+		/* An allocation failure is not fatal */
+		cte = kzalloc(sizeof(*cte), GFP_KERNEL_ACCOUNT);
+		if (WARN_ON(!cte))
+			break;
+
+		INIT_LIST_HEAD(&cte->entry);
+		list_add(&cte->entry, &dist->lpi_translation_cache);
+	}
+}
+
+void vgic_lpi_translation_cache_destroy(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_translation_cache_entry *cte, *tmp;
+
+	vgic_its_invalidate_cache(kvm);
+
+	list_for_each_entry_safe(cte, tmp,
+				 &dist->lpi_translation_cache, entry) {
+		list_del(&cte->entry);
+		kfree(cte);
+	}
+}
+
+#define INITIAL_BASER_VALUE						  \
+	(GIC_BASER_CACHEABILITY(GITS_BASER, INNER, RaWb)		| \
+	 GIC_BASER_CACHEABILITY(GITS_BASER, OUTER, SameAsInner)		| \
+	 GIC_BASER_SHAREABILITY(GITS_BASER, InnerShareable)		| \
+	 GITS_BASER_PAGE_SIZE_64K)
+
+#define INITIAL_PROPBASER_VALUE						  \
+	(GIC_BASER_CACHEABILITY(GICR_PROPBASER, INNER, RaWb)		| \
+	 GIC_BASER_CACHEABILITY(GICR_PROPBASER, OUTER, SameAsInner)	| \
+	 GIC_BASER_SHAREABILITY(GICR_PROPBASER, InnerShareable))
+
+static int vgic_its_create(struct kvm_device *dev, u32 type)
+{
+	int ret;
+	struct vgic_its *its;
+
+	if (type != KVM_DEV_TYPE_ARM_VGIC_ITS)
+		return -ENODEV;
+
+	its = kzalloc(sizeof(struct vgic_its), GFP_KERNEL_ACCOUNT);
+	if (!its)
+		return -ENOMEM;
+
+	mutex_lock(&dev->kvm->arch.config_lock);
+
+	if (vgic_initialized(dev->kvm)) {
+		ret = vgic_v4_init(dev->kvm);
+		if (ret < 0) {
+			mutex_unlock(&dev->kvm->arch.config_lock);
+			kfree(its);
+			return ret;
+		}
+
+		vgic_lpi_translation_cache_init(dev->kvm);
+	}
+
+	mutex_init(&its->its_lock);
+	mutex_init(&its->cmd_lock);
+
+	/* Yep, even more trickery for lock ordering... */
+#ifdef CONFIG_LOCKDEP
+	mutex_lock(&its->cmd_lock);
+	mutex_lock(&its->its_lock);
+	mutex_unlock(&its->its_lock);
+	mutex_unlock(&its->cmd_lock);
+#endif
+
+	its->vgic_its_base = VGIC_ADDR_UNDEF;
+
+	INIT_LIST_HEAD(&its->device_list);
+	INIT_LIST_HEAD(&its->collection_list);
+
+	dev->kvm->arch.vgic.msis_require_devid = true;
+	dev->kvm->arch.vgic.has_its = true;
+	its->enabled = false;
+	its->dev = dev;
+
+	its->baser_device_table = INITIAL_BASER_VALUE			|
+		((u64)GITS_BASER_TYPE_DEVICE << GITS_BASER_TYPE_SHIFT);
+	its->baser_coll_table = INITIAL_BASER_VALUE |
+		((u64)GITS_BASER_TYPE_COLLECTION << GITS_BASER_TYPE_SHIFT);
+	dev->kvm->arch.vgic.propbaser = INITIAL_PROPBASER_VALUE;
+
+	dev->private = its;
+
+	ret = vgic_its_set_abi(its, NR_ITS_ABIS - 1);
+
+	mutex_unlock(&dev->kvm->arch.config_lock);
+
+	return ret;
+}
+
+static void vgic_its_destroy(struct kvm_device *kvm_dev)
+{
+	struct kvm *kvm = kvm_dev->kvm;
+	struct vgic_its *its = kvm_dev->private;
+
+	mutex_lock(&its->its_lock);
+
+	vgic_its_free_device_list(kvm, its);
+	vgic_its_free_collection_list(kvm, its);
+
+	mutex_unlock(&its->its_lock);
+	kfree(its);
+	kfree(kvm_dev);/* alloc by kvm_ioctl_create_device, free by .destroy */
+}
+
+static int vgic_its_has_attr_regs(struct kvm_device *dev,
+				  struct kvm_device_attr *attr)
+{
+	const struct vgic_register_region *region;
+	gpa_t offset = attr->attr;
+	int align;
+
+	align = (offset < GITS_TYPER) || (offset >= GITS_PIDR4) ? 0x3 : 0x7;
+
+	if (offset & align)
+		return -EINVAL;
+
+	region = vgic_find_mmio_region(its_registers,
+				       ARRAY_SIZE(its_registers),
+				       offset);
+	if (!region)
+		return -ENXIO;
+
+	return 0;
+}
+
+static int vgic_its_attr_regs_access(struct kvm_device *dev,
+				     struct kvm_device_attr *attr,
+				     u64 *reg, bool is_write)
+{
+	const struct vgic_register_region *region;
+	struct vgic_its *its;
+	gpa_t addr, offset;
+	unsigned int len;
+	int align, ret = 0;
+
+	its = dev->private;
+	offset = attr->attr;
+
+	/*
+	 * Although the spec supports upper/lower 32-bit accesses to
+	 * 64-bit ITS registers, the userspace ABI requires 64-bit
+	 * accesses to all 64-bit wide registers. We therefore only
+	 * support 32-bit accesses to GITS_CTLR, GITS_IIDR and GITS ID
+	 * registers
+	 */
+	if ((offset < GITS_TYPER) || (offset >= GITS_PIDR4))
+		align = 0x3;
+	else
+		align = 0x7;
+
+	if (offset & align)
+		return -EINVAL;
+
+	mutex_lock(&dev->kvm->lock);
+
+	if (!lock_all_vcpus(dev->kvm)) {
+		mutex_unlock(&dev->kvm->lock);
+		return -EBUSY;
+	}
+
+	mutex_lock(&dev->kvm->arch.config_lock);
+
+	if (IS_VGIC_ADDR_UNDEF(its->vgic_its_base)) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+	region = vgic_find_mmio_region(its_registers,
+				       ARRAY_SIZE(its_registers),
+				       offset);
+	if (!region) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+	addr = its->vgic_its_base + offset;
+
+	len = region->access_flags & VGIC_ACCESS_64bit ? 8 : 4;
+
+	if (is_write) {
+		if (region->uaccess_its_write)
+			ret = region->uaccess_its_write(dev->kvm, its, addr,
+							len, *reg);
+		else
+			region->its_write(dev->kvm, its, addr, len, *reg);
+	} else {
+		*reg = region->its_read(dev->kvm, its, addr, len);
+	}
+out:
+	mutex_unlock(&dev->kvm->arch.config_lock);
+	unlock_all_vcpus(dev->kvm);
+	mutex_unlock(&dev->kvm->lock);
+	return ret;
+}
+
+static u32 compute_next_devid_offset(struct list_head *h,
+				     struct its_device *dev)
+{
+	struct its_device *next;
+	u32 next_offset;
+
+	if (list_is_last(&dev->dev_list, h))
+		return 0;
+	next = list_next_entry(dev, dev_list);
+	next_offset = next->device_id - dev->device_id;
+
+	return min_t(u32, next_offset, VITS_DTE_MAX_DEVID_OFFSET);
+}
+
+static u32 compute_next_eventid_offset(struct list_head *h, struct its_ite *ite)
+{
+	struct its_ite *next;
+	u32 next_offset;
+
+	if (list_is_last(&ite->ite_list, h))
+		return 0;
+	next = list_next_entry(ite, ite_list);
+	next_offset = next->event_id - ite->event_id;
+
+	return min_t(u32, next_offset, VITS_ITE_MAX_EVENTID_OFFSET);
+}
+
+/**
+ * entry_fn_t - Callback called on a table entry restore path
+ * @its: its handle
+ * @id: id of the entry
+ * @entry: pointer to the entry
+ * @opaque: pointer to an opaque data
+ *
+ * Return: < 0 on error, 0 if last element was identified, id offset to next
+ * element otherwise
+ */
+typedef int (*entry_fn_t)(struct vgic_its *its, u32 id, void *entry,
+			  void *opaque);
+
+/**
+ * scan_its_table - Scan a contiguous table in guest RAM and applies a function
+ * to each entry
+ *
+ * @its: its handle
+ * @base: base gpa of the table
+ * @size: size of the table in bytes
+ * @esz: entry size in bytes
+ * @start_id: the ID of the first entry in the table
+ * (non zero for 2d level tables)
+ * @fn: function to apply on each entry
+ *
+ * Return: < 0 on error, 0 if last element was identified, 1 otherwise
+ * (the last element may not be found on second level tables)
+ */
+static int scan_its_table(struct vgic_its *its, gpa_t base, int size, u32 esz,
+			  int start_id, entry_fn_t fn, void *opaque)
+{
+	struct kvm *kvm = its->dev->kvm;
+	unsigned long len = size;
+	int id = start_id;
+	gpa_t gpa = base;
+	char entry[ESZ_MAX];
+	int ret;
+
+	memset(entry, 0, esz);
+
+	while (true) {
+		int next_offset;
+		size_t byte_offset;
+
+		ret = kvm_read_guest_lock(kvm, gpa, entry, esz);
+		if (ret)
+			return ret;
+
+		next_offset = fn(its, id, entry, opaque);
+		if (next_offset <= 0)
+			return next_offset;
+
+		byte_offset = next_offset * esz;
+		if (byte_offset >= len)
+			break;
+
+		id += next_offset;
+		gpa += byte_offset;
+		len -= byte_offset;
+	}
+	return 1;
+}
+
+/**
+ * vgic_its_save_ite - Save an interrupt translation entry at @gpa
+ */
+static int vgic_its_save_ite(struct vgic_its *its, struct its_device *dev,
+			      struct its_ite *ite, gpa_t gpa, int ite_esz)
+{
+	struct kvm *kvm = its->dev->kvm;
+	u32 next_offset;
+	u64 val;
+
+	next_offset = compute_next_eventid_offset(&dev->itt_head, ite);
+	val = ((u64)next_offset << KVM_ITS_ITE_NEXT_SHIFT) |
+	       ((u64)ite->irq->intid << KVM_ITS_ITE_PINTID_SHIFT) |
+		ite->collection->collection_id;
+	val = cpu_to_le64(val);
+	return kvm_write_guest_lock(kvm, gpa, &val, ite_esz);
+}
+
+/**
+ * vgic_its_restore_ite - restore an interrupt translation entry
+ * @event_id: id used for indexing
+ * @ptr: pointer to the ITE entry
+ * @opaque: pointer to the its_device
+ */
+static int vgic_its_restore_ite(struct vgic_its *its, u32 event_id,
+				void *ptr, void *opaque)
+{
+	struct its_device *dev = opaque;
+	struct its_collection *collection;
+	struct kvm *kvm = its->dev->kvm;
+	struct kvm_vcpu *vcpu = NULL;
+	u64 val;
+	u64 *p = (u64 *)ptr;
+	struct vgic_irq *irq;
+	u32 coll_id, lpi_id;
+	struct its_ite *ite;
+	u32 offset;
+
+	val = *p;
+
+	val = le64_to_cpu(val);
+
+	coll_id = val & KVM_ITS_ITE_ICID_MASK;
+	lpi_id = (val & KVM_ITS_ITE_PINTID_MASK) >> KVM_ITS_ITE_PINTID_SHIFT;
+
+	if (!lpi_id)
+		return 1; /* invalid entry, no choice but to scan next entry */
+
+	if (lpi_id < VGIC_MIN_LPI)
+		return -EINVAL;
+
+	offset = val >> KVM_ITS_ITE_NEXT_SHIFT;
+	if (event_id + offset >= BIT_ULL(dev->num_eventid_bits))
+		return -EINVAL;
+
+	collection = find_collection(its, coll_id);
+	if (!collection)
+		return -EINVAL;
+
+	if (!vgic_its_check_event_id(its, dev, event_id))
+		return -EINVAL;
+
+	ite = vgic_its_alloc_ite(dev, collection, event_id);
+	if (IS_ERR(ite))
+		return PTR_ERR(ite);
+
+	if (its_is_collection_mapped(collection))
+		vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+
+	irq = vgic_add_lpi(kvm, lpi_id, vcpu);
+	if (IS_ERR(irq)) {
+		its_free_ite(kvm, ite);
+		return PTR_ERR(irq);
+	}
+	ite->irq = irq;
+
+	return offset;
+}
+
+static int vgic_its_ite_cmp(void *priv, const struct list_head *a,
+			    const struct list_head *b)
+{
+	struct its_ite *itea = container_of(a, struct its_ite, ite_list);
+	struct its_ite *iteb = container_of(b, struct its_ite, ite_list);
+
+	if (itea->event_id < iteb->event_id)
+		return -1;
+	else
+		return 1;
+}
+
+static int vgic_its_save_itt(struct vgic_its *its, struct its_device *device)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	gpa_t base = device->itt_addr;
+	struct its_ite *ite;
+	int ret;
+	int ite_esz = abi->ite_esz;
+
+	list_sort(NULL, &device->itt_head, vgic_its_ite_cmp);
+
+	list_for_each_entry(ite, &device->itt_head, ite_list) {
+		gpa_t gpa = base + ite->event_id * ite_esz;
+
+		/*
+		 * If an LPI carries the HW bit, this means that this
+		 * interrupt is controlled by GICv4, and we do not
+		 * have direct access to that state without GICv4.1.
+		 * Let's simply fail the save operation...
+		 */
+		if (ite->irq->hw && !kvm_vgic_global_state.has_gicv4_1)
+			return -EACCES;
+
+		ret = vgic_its_save_ite(its, device, ite, gpa, ite_esz);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+/**
+ * vgic_its_restore_itt - restore the ITT of a device
+ *
+ * @its: its handle
+ * @dev: device handle
+ *
+ * Return 0 on success, < 0 on error
+ */
+static int vgic_its_restore_itt(struct vgic_its *its, struct its_device *dev)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	gpa_t base = dev->itt_addr;
+	int ret;
+	int ite_esz = abi->ite_esz;
+	size_t max_size = BIT_ULL(dev->num_eventid_bits) * ite_esz;
+
+	ret = scan_its_table(its, base, max_size, ite_esz, 0,
+			     vgic_its_restore_ite, dev);
+
+	/* scan_its_table returns +1 if all ITEs are invalid */
+	if (ret > 0)
+		ret = 0;
+
+	return ret;
+}
+
+/**
+ * vgic_its_save_dte - Save a device table entry at a given GPA
+ *
+ * @its: ITS handle
+ * @dev: ITS device
+ * @ptr: GPA
+ */
+static int vgic_its_save_dte(struct vgic_its *its, struct its_device *dev,
+			     gpa_t ptr, int dte_esz)
+{
+	struct kvm *kvm = its->dev->kvm;
+	u64 val, itt_addr_field;
+	u32 next_offset;
+
+	itt_addr_field = dev->itt_addr >> 8;
+	next_offset = compute_next_devid_offset(&its->device_list, dev);
+	val = (1ULL << KVM_ITS_DTE_VALID_SHIFT |
+	       ((u64)next_offset << KVM_ITS_DTE_NEXT_SHIFT) |
+	       (itt_addr_field << KVM_ITS_DTE_ITTADDR_SHIFT) |
+		(dev->num_eventid_bits - 1));
+	val = cpu_to_le64(val);
+	return kvm_write_guest_lock(kvm, ptr, &val, dte_esz);
+}
+
+/**
+ * vgic_its_restore_dte - restore a device table entry
+ *
+ * @its: its handle
+ * @id: device id the DTE corresponds to
+ * @ptr: kernel VA where the 8 byte DTE is located
+ * @opaque: unused
+ *
+ * Return: < 0 on error, 0 if the dte is the last one, id offset to the
+ * next dte otherwise
+ */
+static int vgic_its_restore_dte(struct vgic_its *its, u32 id,
+				void *ptr, void *opaque)
+{
+	struct its_device *dev;
+	u64 baser = its->baser_device_table;
+	gpa_t itt_addr;
+	u8 num_eventid_bits;
+	u64 entry = *(u64 *)ptr;
+	bool valid;
+	u32 offset;
+	int ret;
+
+	entry = le64_to_cpu(entry);
+
+	valid = entry >> KVM_ITS_DTE_VALID_SHIFT;
+	num_eventid_bits = (entry & KVM_ITS_DTE_SIZE_MASK) + 1;
+	itt_addr = ((entry & KVM_ITS_DTE_ITTADDR_MASK)
+			>> KVM_ITS_DTE_ITTADDR_SHIFT) << 8;
+
+	if (!valid)
+		return 1;
+
+	/* dte entry is valid */
+	offset = (entry & KVM_ITS_DTE_NEXT_MASK) >> KVM_ITS_DTE_NEXT_SHIFT;
+
+	if (!vgic_its_check_id(its, baser, id, NULL))
+		return -EINVAL;
+
+	dev = vgic_its_alloc_device(its, id, itt_addr, num_eventid_bits);
+	if (IS_ERR(dev))
+		return PTR_ERR(dev);
+
+	ret = vgic_its_restore_itt(its, dev);
+	if (ret) {
+		vgic_its_free_device(its->dev->kvm, dev);
+		return ret;
+	}
+
+	return offset;
+}
+
+static int vgic_its_device_cmp(void *priv, const struct list_head *a,
+			       const struct list_head *b)
+{
+	struct its_device *deva = container_of(a, struct its_device, dev_list);
+	struct its_device *devb = container_of(b, struct its_device, dev_list);
+
+	if (deva->device_id < devb->device_id)
+		return -1;
+	else
+		return 1;
+}
+
+/**
+ * vgic_its_save_device_tables - Save the device table and all ITT
+ * into guest RAM
+ *
+ * L1/L2 handling is hidden by vgic_its_check_id() helper which directly
+ * returns the GPA of the device entry
+ */
+static int vgic_its_save_device_tables(struct vgic_its *its)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	u64 baser = its->baser_device_table;
+	struct its_device *dev;
+	int dte_esz = abi->dte_esz;
+
+	if (!(baser & GITS_BASER_VALID))
+		return 0;
+
+	list_sort(NULL, &its->device_list, vgic_its_device_cmp);
+
+	list_for_each_entry(dev, &its->device_list, dev_list) {
+		int ret;
+		gpa_t eaddr;
+
+		if (!vgic_its_check_id(its, baser,
+				       dev->device_id, &eaddr))
+			return -EINVAL;
+
+		ret = vgic_its_save_itt(its, dev);
+		if (ret)
+			return ret;
+
+		ret = vgic_its_save_dte(its, dev, eaddr, dte_esz);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+/**
+ * handle_l1_dte - callback used for L1 device table entries (2 stage case)
+ *
+ * @its: its handle
+ * @id: index of the entry in the L1 table
+ * @addr: kernel VA
+ * @opaque: unused
+ *
+ * L1 table entries are scanned by steps of 1 entry
+ * Return < 0 if error, 0 if last dte was found when scanning the L2
+ * table, +1 otherwise (meaning next L1 entry must be scanned)
+ */
+static int handle_l1_dte(struct vgic_its *its, u32 id, void *addr,
+			 void *opaque)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	int l2_start_id = id * (SZ_64K / abi->dte_esz);
+	u64 entry = *(u64 *)addr;
+	int dte_esz = abi->dte_esz;
+	gpa_t gpa;
+	int ret;
+
+	entry = le64_to_cpu(entry);
+
+	if (!(entry & KVM_ITS_L1E_VALID_MASK))
+		return 1;
+
+	gpa = entry & KVM_ITS_L1E_ADDR_MASK;
+
+	ret = scan_its_table(its, gpa, SZ_64K, dte_esz,
+			     l2_start_id, vgic_its_restore_dte, NULL);
+
+	return ret;
+}
+
+/**
+ * vgic_its_restore_device_tables - Restore the device table and all ITT
+ * from guest RAM to internal data structs
+ */
+static int vgic_its_restore_device_tables(struct vgic_its *its)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	u64 baser = its->baser_device_table;
+	int l1_esz, ret;
+	int l1_tbl_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
+	gpa_t l1_gpa;
+
+	if (!(baser & GITS_BASER_VALID))
+		return 0;
+
+	l1_gpa = GITS_BASER_ADDR_48_to_52(baser);
+
+	if (baser & GITS_BASER_INDIRECT) {
+		l1_esz = GITS_LVL1_ENTRY_SIZE;
+		ret = scan_its_table(its, l1_gpa, l1_tbl_size, l1_esz, 0,
+				     handle_l1_dte, NULL);
+	} else {
+		l1_esz = abi->dte_esz;
+		ret = scan_its_table(its, l1_gpa, l1_tbl_size, l1_esz, 0,
+				     vgic_its_restore_dte, NULL);
+	}
+
+	/* scan_its_table returns +1 if all entries are invalid */
+	if (ret > 0)
+		ret = 0;
+
+	if (ret < 0)
+		vgic_its_free_device_list(its->dev->kvm, its);
+
+	return ret;
+}
+
+static int vgic_its_save_cte(struct vgic_its *its,
+			     struct its_collection *collection,
+			     gpa_t gpa, int esz)
+{
+	u64 val;
+
+	val = (1ULL << KVM_ITS_CTE_VALID_SHIFT |
+	       ((u64)collection->target_addr << KVM_ITS_CTE_RDBASE_SHIFT) |
+	       collection->collection_id);
+	val = cpu_to_le64(val);
+	return kvm_write_guest_lock(its->dev->kvm, gpa, &val, esz);
+}
+
+/*
+ * Restore a collection entry into the ITS collection table.
+ * Return +1 on success, 0 if the entry was invalid (which should be
+ * interpreted as end-of-table), and a negative error value for generic errors.
+ */
+static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
+{
+	struct its_collection *collection;
+	struct kvm *kvm = its->dev->kvm;
+	u32 target_addr, coll_id;
+	u64 val;
+	int ret;
+
+	BUG_ON(esz > sizeof(val));
+	ret = kvm_read_guest_lock(kvm, gpa, &val, esz);
+	if (ret)
+		return ret;
+	val = le64_to_cpu(val);
+	if (!(val & KVM_ITS_CTE_VALID_MASK))
+		return 0;
+
+	target_addr = (u32)(val >> KVM_ITS_CTE_RDBASE_SHIFT);
+	coll_id = val & KVM_ITS_CTE_ICID_MASK;
+
+	if (target_addr != COLLECTION_NOT_MAPPED &&
+	    target_addr >= atomic_read(&kvm->online_vcpus))
+		return -EINVAL;
+
+	collection = find_collection(its, coll_id);
+	if (collection)
+		return -EEXIST;
+
+	if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL))
+		return -EINVAL;
+
+	ret = vgic_its_alloc_collection(its, &collection, coll_id);
+	if (ret)
+		return ret;
+	collection->target_addr = target_addr;
+	return 1;
+}
+
+/**
+ * vgic_its_save_collection_table - Save the collection table into
+ * guest RAM
+ */
+static int vgic_its_save_collection_table(struct vgic_its *its)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	u64 baser = its->baser_coll_table;
+	gpa_t gpa = GITS_BASER_ADDR_48_to_52(baser);
+	struct its_collection *collection;
+	u64 val;
+	size_t max_size, filled = 0;
+	int ret, cte_esz = abi->cte_esz;
+
+	if (!(baser & GITS_BASER_VALID))
+		return 0;
+
+	max_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
+
+	list_for_each_entry(collection, &its->collection_list, coll_list) {
+		ret = vgic_its_save_cte(its, collection, gpa, cte_esz);
+		if (ret)
+			return ret;
+		gpa += cte_esz;
+		filled += cte_esz;
+	}
+
+	if (filled == max_size)
+		return 0;
+
+	/*
+	 * table is not fully filled, add a last dummy element
+	 * with valid bit unset
+	 */
+	val = 0;
+	BUG_ON(cte_esz > sizeof(val));
+	ret = kvm_write_guest_lock(its->dev->kvm, gpa, &val, cte_esz);
+	return ret;
+}
+
+/**
+ * vgic_its_restore_collection_table - reads the collection table
+ * in guest memory and restores the ITS internal state. Requires the
+ * BASER registers to be restored before.
+ */
+static int vgic_its_restore_collection_table(struct vgic_its *its)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	u64 baser = its->baser_coll_table;
+	int cte_esz = abi->cte_esz;
+	size_t max_size, read = 0;
+	gpa_t gpa;
+	int ret;
+
+	if (!(baser & GITS_BASER_VALID))
+		return 0;
+
+	gpa = GITS_BASER_ADDR_48_to_52(baser);
+
+	max_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
+
+	while (read < max_size) {
+		ret = vgic_its_restore_cte(its, gpa, cte_esz);
+		if (ret <= 0)
+			break;
+		gpa += cte_esz;
+		read += cte_esz;
+	}
+
+	if (ret > 0)
+		return 0;
+
+	if (ret < 0)
+		vgic_its_free_collection_list(its->dev->kvm, its);
+
+	return ret;
+}
+
+/**
+ * vgic_its_save_tables_v0 - Save the ITS tables into guest ARM
+ * according to v0 ABI
+ */
+static int vgic_its_save_tables_v0(struct vgic_its *its)
+{
+	int ret;
+
+	ret = vgic_its_save_device_tables(its);
+	if (ret)
+		return ret;
+
+	return vgic_its_save_collection_table(its);
+}
+
+/**
+ * vgic_its_restore_tables_v0 - Restore the ITS tables from guest RAM
+ * to internal data structs according to V0 ABI
+ *
+ */
+static int vgic_its_restore_tables_v0(struct vgic_its *its)
+{
+	int ret;
+
+	ret = vgic_its_restore_collection_table(its);
+	if (ret)
+		return ret;
+
+	ret = vgic_its_restore_device_tables(its);
+	if (ret)
+		vgic_its_free_collection_list(its->dev->kvm, its);
+	return ret;
+}
+
+static int vgic_its_commit_v0(struct vgic_its *its)
+{
+	const struct vgic_its_abi *abi;
+
+	abi = vgic_its_get_abi(its);
+	its->baser_coll_table &= ~GITS_BASER_ENTRY_SIZE_MASK;
+	its->baser_device_table &= ~GITS_BASER_ENTRY_SIZE_MASK;
+
+	its->baser_coll_table |= (GIC_ENCODE_SZ(abi->cte_esz, 5)
+					<< GITS_BASER_ENTRY_SIZE_SHIFT);
+
+	its->baser_device_table |= (GIC_ENCODE_SZ(abi->dte_esz, 5)
+					<< GITS_BASER_ENTRY_SIZE_SHIFT);
+	return 0;
+}
+
+static void vgic_its_reset(struct kvm *kvm, struct vgic_its *its)
+{
+	/* We need to keep the ABI specific field values */
+	its->baser_coll_table &= ~GITS_BASER_VALID;
+	its->baser_device_table &= ~GITS_BASER_VALID;
+	its->cbaser = 0;
+	its->creadr = 0;
+	its->cwriter = 0;
+	its->enabled = 0;
+	vgic_its_free_device_list(kvm, its);
+	vgic_its_free_collection_list(kvm, its);
+}
+
+static int vgic_its_has_attr(struct kvm_device *dev,
+			     struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+		switch (attr->attr) {
+		case KVM_VGIC_ITS_ADDR_TYPE:
+			return 0;
+		}
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_CTRL:
+		switch (attr->attr) {
+		case KVM_DEV_ARM_VGIC_CTRL_INIT:
+			return 0;
+		case KVM_DEV_ARM_ITS_CTRL_RESET:
+			return 0;
+		case KVM_DEV_ARM_ITS_SAVE_TABLES:
+			return 0;
+		case KVM_DEV_ARM_ITS_RESTORE_TABLES:
+			return 0;
+		}
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_ITS_REGS:
+		return vgic_its_has_attr_regs(dev, attr);
+	}
+	return -ENXIO;
+}
+
+static int vgic_its_ctrl(struct kvm *kvm, struct vgic_its *its, u64 attr)
+{
+	const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+	int ret = 0;
+
+	if (attr == KVM_DEV_ARM_VGIC_CTRL_INIT) /* Nothing to do */
+		return 0;
+
+	mutex_lock(&kvm->lock);
+
+	if (!lock_all_vcpus(kvm)) {
+		mutex_unlock(&kvm->lock);
+		return -EBUSY;
+	}
+
+	mutex_lock(&kvm->arch.config_lock);
+	mutex_lock(&its->its_lock);
+
+	switch (attr) {
+	case KVM_DEV_ARM_ITS_CTRL_RESET:
+		vgic_its_reset(kvm, its);
+		break;
+	case KVM_DEV_ARM_ITS_SAVE_TABLES:
+		ret = abi->save_tables(its);
+		break;
+	case KVM_DEV_ARM_ITS_RESTORE_TABLES:
+		ret = abi->restore_tables(its);
+		break;
+	}
+
+	mutex_unlock(&its->its_lock);
+	mutex_unlock(&kvm->arch.config_lock);
+	unlock_all_vcpus(kvm);
+	mutex_unlock(&kvm->lock);
+	return ret;
+}
+
+static int vgic_its_set_attr(struct kvm_device *dev,
+			     struct kvm_device_attr *attr)
+{
+	struct vgic_its *its = dev->private;
+	int ret;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		unsigned long type = (unsigned long)attr->attr;
+		u64 addr;
+
+		if (type != KVM_VGIC_ITS_ADDR_TYPE)
+			return -ENODEV;
+
+		if (copy_from_user(&addr, uaddr, sizeof(addr)))
+			return -EFAULT;
+
+		ret = vgic_check_iorange(dev->kvm, its->vgic_its_base,
+					 addr, SZ_64K, KVM_VGIC_V3_ITS_SIZE);
+		if (ret)
+			return ret;
+
+		return vgic_register_its_iodev(dev->kvm, its, addr);
+	}
+	case KVM_DEV_ARM_VGIC_GRP_CTRL:
+		return vgic_its_ctrl(dev->kvm, its, attr->attr);
+	case KVM_DEV_ARM_VGIC_GRP_ITS_REGS: {
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		u64 reg;
+
+		if (get_user(reg, uaddr))
+			return -EFAULT;
+
+		return vgic_its_attr_regs_access(dev, attr, &reg, true);
+	}
+	}
+	return -ENXIO;
+}
+
+static int vgic_its_get_attr(struct kvm_device *dev,
+			     struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+		struct vgic_its *its = dev->private;
+		u64 addr = its->vgic_its_base;
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		unsigned long type = (unsigned long)attr->attr;
+
+		if (type != KVM_VGIC_ITS_ADDR_TYPE)
+			return -ENODEV;
+
+		if (copy_to_user(uaddr, &addr, sizeof(addr)))
+			return -EFAULT;
+		break;
+	}
+	case KVM_DEV_ARM_VGIC_GRP_ITS_REGS: {
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		u64 reg;
+		int ret;
+
+		ret = vgic_its_attr_regs_access(dev, attr, &reg, false);
+		if (ret)
+			return ret;
+		return put_user(reg, uaddr);
+	}
+	default:
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static struct kvm_device_ops kvm_arm_vgic_its_ops = {
+	.name = "kvm-arm-vgic-its",
+	.create = vgic_its_create,
+	.destroy = vgic_its_destroy,
+	.set_attr = vgic_its_set_attr,
+	.get_attr = vgic_its_get_attr,
+	.has_attr = vgic_its_has_attr,
+};
+
+int kvm_vgic_register_its_device(void)
+{
+	return kvm_register_device_ops(&kvm_arm_vgic_its_ops,
+				       KVM_DEV_TYPE_ARM_VGIC_ITS);
+}
diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c
new file mode 100644
index 000000000..bf4b3d963
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c
@@ -0,0 +1,710 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VGIC: KVM DEVICE API
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+#include <linux/kvm_host.h>
+#include <kvm/arm_vgic.h>
+#include <linux/uaccess.h>
+#include <asm/kvm_mmu.h>
+#include <asm/cputype.h>
+#include "vgic.h"
+
+/* common helpers */
+
+int vgic_check_iorange(struct kvm *kvm, phys_addr_t ioaddr,
+		       phys_addr_t addr, phys_addr_t alignment,
+		       phys_addr_t size)
+{
+	if (!IS_VGIC_ADDR_UNDEF(ioaddr))
+		return -EEXIST;
+
+	if (!IS_ALIGNED(addr, alignment) || !IS_ALIGNED(size, alignment))
+		return -EINVAL;
+
+	if (addr + size < addr)
+		return -EINVAL;
+
+	if (addr & ~kvm_phys_mask(kvm) || addr + size > kvm_phys_size(kvm))
+		return -E2BIG;
+
+	return 0;
+}
+
+static int vgic_check_type(struct kvm *kvm, int type_needed)
+{
+	if (kvm->arch.vgic.vgic_model != type_needed)
+		return -ENODEV;
+	else
+		return 0;
+}
+
+int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev_addr)
+{
+	struct vgic_dist *vgic = &kvm->arch.vgic;
+	int r;
+
+	mutex_lock(&kvm->arch.config_lock);
+	switch (FIELD_GET(KVM_ARM_DEVICE_TYPE_MASK, dev_addr->id)) {
+	case KVM_VGIC_V2_ADDR_TYPE_DIST:
+		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+		if (!r)
+			r = vgic_check_iorange(kvm, vgic->vgic_dist_base, dev_addr->addr,
+					       SZ_4K, KVM_VGIC_V2_DIST_SIZE);
+		if (!r)
+			vgic->vgic_dist_base = dev_addr->addr;
+		break;
+	case KVM_VGIC_V2_ADDR_TYPE_CPU:
+		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+		if (!r)
+			r = vgic_check_iorange(kvm, vgic->vgic_cpu_base, dev_addr->addr,
+					       SZ_4K, KVM_VGIC_V2_CPU_SIZE);
+		if (!r)
+			vgic->vgic_cpu_base = dev_addr->addr;
+		break;
+	default:
+		r = -ENODEV;
+	}
+
+	mutex_unlock(&kvm->arch.config_lock);
+
+	return r;
+}
+
+/**
+ * kvm_vgic_addr - set or get vgic VM base addresses
+ * @kvm:   pointer to the vm struct
+ * @attr:  pointer to the attribute being retrieved/updated
+ * @write: if true set the address in the VM address space, if false read the
+ *          address
+ *
+ * Set or get the vgic base addresses for the distributor and the virtual CPU
+ * interface in the VM physical address space.  These addresses are properties
+ * of the emulated core/SoC and therefore user space initially knows this
+ * information.
+ * Check them for sanity (alignment, double assignment). We can't check for
+ * overlapping regions in case of a virtual GICv3 here, since we don't know
+ * the number of VCPUs yet, so we defer this check to map_resources().
+ */
+static int kvm_vgic_addr(struct kvm *kvm, struct kvm_device_attr *attr, bool write)
+{
+	u64 __user *uaddr = (u64 __user *)attr->addr;
+	struct vgic_dist *vgic = &kvm->arch.vgic;
+	phys_addr_t *addr_ptr, alignment, size;
+	u64 undef_value = VGIC_ADDR_UNDEF;
+	u64 addr;
+	int r;
+
+	/* Reading a redistributor region addr implies getting the index */
+	if (write || attr->attr == KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION)
+		if (get_user(addr, uaddr))
+			return -EFAULT;
+
+	/*
+	 * Since we can't hold config_lock while registering the redistributor
+	 * iodevs, take the slots_lock immediately.
+	 */
+	mutex_lock(&kvm->slots_lock);
+	switch (attr->attr) {
+	case KVM_VGIC_V2_ADDR_TYPE_DIST:
+		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+		addr_ptr = &vgic->vgic_dist_base;
+		alignment = SZ_4K;
+		size = KVM_VGIC_V2_DIST_SIZE;
+		break;
+	case KVM_VGIC_V2_ADDR_TYPE_CPU:
+		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
+		addr_ptr = &vgic->vgic_cpu_base;
+		alignment = SZ_4K;
+		size = KVM_VGIC_V2_CPU_SIZE;
+		break;
+	case KVM_VGIC_V3_ADDR_TYPE_DIST:
+		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V3);
+		addr_ptr = &vgic->vgic_dist_base;
+		alignment = SZ_64K;
+		size = KVM_VGIC_V3_DIST_SIZE;
+		break;
+	case KVM_VGIC_V3_ADDR_TYPE_REDIST: {
+		struct vgic_redist_region *rdreg;
+
+		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V3);
+		if (r)
+			break;
+		if (write) {
+			r = vgic_v3_set_redist_base(kvm, 0, addr, 0);
+			goto out;
+		}
+		rdreg = list_first_entry_or_null(&vgic->rd_regions,
+						 struct vgic_redist_region, list);
+		if (!rdreg)
+			addr_ptr = &undef_value;
+		else
+			addr_ptr = &rdreg->base;
+		break;
+	}
+	case KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION:
+	{
+		struct vgic_redist_region *rdreg;
+		u8 index;
+
+		r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V3);
+		if (r)
+			break;
+
+		index = addr & KVM_VGIC_V3_RDIST_INDEX_MASK;
+
+		if (write) {
+			gpa_t base = addr & KVM_VGIC_V3_RDIST_BASE_MASK;
+			u32 count = FIELD_GET(KVM_VGIC_V3_RDIST_COUNT_MASK, addr);
+			u8 flags = FIELD_GET(KVM_VGIC_V3_RDIST_FLAGS_MASK, addr);
+
+			if (!count || flags)
+				r = -EINVAL;
+			else
+				r = vgic_v3_set_redist_base(kvm, index,
+							    base, count);
+			goto out;
+		}
+
+		rdreg = vgic_v3_rdist_region_from_index(kvm, index);
+		if (!rdreg) {
+			r = -ENOENT;
+			goto out;
+		}
+
+		addr = index;
+		addr |= rdreg->base;
+		addr |= (u64)rdreg->count << KVM_VGIC_V3_RDIST_COUNT_SHIFT;
+		goto out;
+	}
+	default:
+		r = -ENODEV;
+	}
+
+	if (r)
+		goto out;
+
+	mutex_lock(&kvm->arch.config_lock);
+	if (write) {
+		r = vgic_check_iorange(kvm, *addr_ptr, addr, alignment, size);
+		if (!r)
+			*addr_ptr = addr;
+	} else {
+		addr = *addr_ptr;
+	}
+	mutex_unlock(&kvm->arch.config_lock);
+
+out:
+	mutex_unlock(&kvm->slots_lock);
+
+	if (!r && !write)
+		r =  put_user(addr, uaddr);
+
+	return r;
+}
+
+static int vgic_set_common_attr(struct kvm_device *dev,
+				struct kvm_device_attr *attr)
+{
+	int r;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+		r = kvm_vgic_addr(dev->kvm, attr, true);
+		return (r == -ENODEV) ? -ENXIO : r;
+	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
+		u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+		u32 val;
+		int ret = 0;
+
+		if (get_user(val, uaddr))
+			return -EFAULT;
+
+		/*
+		 * We require:
+		 * - at least 32 SPIs on top of the 16 SGIs and 16 PPIs
+		 * - at most 1024 interrupts
+		 * - a multiple of 32 interrupts
+		 */
+		if (val < (VGIC_NR_PRIVATE_IRQS + 32) ||
+		    val > VGIC_MAX_RESERVED ||
+		    (val & 31))
+			return -EINVAL;
+
+		mutex_lock(&dev->kvm->arch.config_lock);
+
+		if (vgic_ready(dev->kvm) || dev->kvm->arch.vgic.nr_spis)
+			ret = -EBUSY;
+		else
+			dev->kvm->arch.vgic.nr_spis =
+				val - VGIC_NR_PRIVATE_IRQS;
+
+		mutex_unlock(&dev->kvm->arch.config_lock);
+
+		return ret;
+	}
+	case KVM_DEV_ARM_VGIC_GRP_CTRL: {
+		switch (attr->attr) {
+		case KVM_DEV_ARM_VGIC_CTRL_INIT:
+			mutex_lock(&dev->kvm->arch.config_lock);
+			r = vgic_init(dev->kvm);
+			mutex_unlock(&dev->kvm->arch.config_lock);
+			return r;
+		case KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES:
+			/*
+			 * OK, this one isn't common at all, but we
+			 * want to handle all control group attributes
+			 * in a single place.
+			 */
+			if (vgic_check_type(dev->kvm, KVM_DEV_TYPE_ARM_VGIC_V3))
+				return -ENXIO;
+			mutex_lock(&dev->kvm->lock);
+
+			if (!lock_all_vcpus(dev->kvm)) {
+				mutex_unlock(&dev->kvm->lock);
+				return -EBUSY;
+			}
+
+			mutex_lock(&dev->kvm->arch.config_lock);
+			r = vgic_v3_save_pending_tables(dev->kvm);
+			mutex_unlock(&dev->kvm->arch.config_lock);
+			unlock_all_vcpus(dev->kvm);
+			mutex_unlock(&dev->kvm->lock);
+			return r;
+		}
+		break;
+	}
+	}
+
+	return -ENXIO;
+}
+
+static int vgic_get_common_attr(struct kvm_device *dev,
+				struct kvm_device_attr *attr)
+{
+	int r = -ENXIO;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+		r = kvm_vgic_addr(dev->kvm, attr, false);
+		return (r == -ENODEV) ? -ENXIO : r;
+	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
+		u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+
+		r = put_user(dev->kvm->arch.vgic.nr_spis +
+			     VGIC_NR_PRIVATE_IRQS, uaddr);
+		break;
+	}
+	}
+
+	return r;
+}
+
+static int vgic_create(struct kvm_device *dev, u32 type)
+{
+	return kvm_vgic_create(dev->kvm, type);
+}
+
+static void vgic_destroy(struct kvm_device *dev)
+{
+	kfree(dev);
+}
+
+int kvm_register_vgic_device(unsigned long type)
+{
+	int ret = -ENODEV;
+
+	switch (type) {
+	case KVM_DEV_TYPE_ARM_VGIC_V2:
+		ret = kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
+					      KVM_DEV_TYPE_ARM_VGIC_V2);
+		break;
+	case KVM_DEV_TYPE_ARM_VGIC_V3:
+		ret = kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
+					      KVM_DEV_TYPE_ARM_VGIC_V3);
+
+		if (ret)
+			break;
+		ret = kvm_vgic_register_its_device();
+		break;
+	}
+
+	return ret;
+}
+
+int vgic_v2_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr,
+		       struct vgic_reg_attr *reg_attr)
+{
+	int cpuid;
+
+	cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
+		 KVM_DEV_ARM_VGIC_CPUID_SHIFT;
+
+	if (cpuid >= atomic_read(&dev->kvm->online_vcpus))
+		return -EINVAL;
+
+	reg_attr->vcpu = kvm_get_vcpu(dev->kvm, cpuid);
+	reg_attr->addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+
+	return 0;
+}
+
+/* unlocks vcpus from @vcpu_lock_idx and smaller */
+static void unlock_vcpus(struct kvm *kvm, int vcpu_lock_idx)
+{
+	struct kvm_vcpu *tmp_vcpu;
+
+	for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
+		tmp_vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
+		mutex_unlock(&tmp_vcpu->mutex);
+	}
+}
+
+void unlock_all_vcpus(struct kvm *kvm)
+{
+	unlock_vcpus(kvm, atomic_read(&kvm->online_vcpus) - 1);
+}
+
+/* Returns true if all vcpus were locked, false otherwise */
+bool lock_all_vcpus(struct kvm *kvm)
+{
+	struct kvm_vcpu *tmp_vcpu;
+	unsigned long c;
+
+	/*
+	 * Any time a vcpu is run, vcpu_load is called which tries to grab the
+	 * vcpu->mutex.  By grabbing the vcpu->mutex of all VCPUs we ensure
+	 * that no other VCPUs are run and fiddle with the vgic state while we
+	 * access it.
+	 */
+	kvm_for_each_vcpu(c, tmp_vcpu, kvm) {
+		if (!mutex_trylock(&tmp_vcpu->mutex)) {
+			unlock_vcpus(kvm, c - 1);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+/**
+ * vgic_v2_attr_regs_access - allows user space to access VGIC v2 state
+ *
+ * @dev:      kvm device handle
+ * @attr:     kvm device attribute
+ * @is_write: true if userspace is writing a register
+ */
+static int vgic_v2_attr_regs_access(struct kvm_device *dev,
+				    struct kvm_device_attr *attr,
+				    bool is_write)
+{
+	u32 __user *uaddr = (u32 __user *)(unsigned long)attr->addr;
+	struct vgic_reg_attr reg_attr;
+	gpa_t addr;
+	struct kvm_vcpu *vcpu;
+	int ret;
+	u32 val;
+
+	ret = vgic_v2_parse_attr(dev, attr, &reg_attr);
+	if (ret)
+		return ret;
+
+	vcpu = reg_attr.vcpu;
+	addr = reg_attr.addr;
+
+	if (is_write)
+		if (get_user(val, uaddr))
+			return -EFAULT;
+
+	mutex_lock(&dev->kvm->lock);
+
+	if (!lock_all_vcpus(dev->kvm)) {
+		mutex_unlock(&dev->kvm->lock);
+		return -EBUSY;
+	}
+
+	mutex_lock(&dev->kvm->arch.config_lock);
+
+	ret = vgic_init(dev->kvm);
+	if (ret)
+		goto out;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+		ret = vgic_v2_cpuif_uaccess(vcpu, is_write, addr, &val);
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+		ret = vgic_v2_dist_uaccess(vcpu, is_write, addr, &val);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+out:
+	mutex_unlock(&dev->kvm->arch.config_lock);
+	unlock_all_vcpus(dev->kvm);
+	mutex_unlock(&dev->kvm->lock);
+
+	if (!ret && !is_write)
+		ret = put_user(val, uaddr);
+
+	return ret;
+}
+
+static int vgic_v2_set_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+		return vgic_v2_attr_regs_access(dev, attr, true);
+	default:
+		return vgic_set_common_attr(dev, attr);
+	}
+}
+
+static int vgic_v2_get_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+		return vgic_v2_attr_regs_access(dev, attr, false);
+	default:
+		return vgic_get_common_attr(dev, attr);
+	}
+}
+
+static int vgic_v2_has_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+		switch (attr->attr) {
+		case KVM_VGIC_V2_ADDR_TYPE_DIST:
+		case KVM_VGIC_V2_ADDR_TYPE_CPU:
+			return 0;
+		}
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+		return vgic_v2_has_attr_regs(dev, attr);
+	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
+		return 0;
+	case KVM_DEV_ARM_VGIC_GRP_CTRL:
+		switch (attr->attr) {
+		case KVM_DEV_ARM_VGIC_CTRL_INIT:
+			return 0;
+		}
+	}
+	return -ENXIO;
+}
+
+struct kvm_device_ops kvm_arm_vgic_v2_ops = {
+	.name = "kvm-arm-vgic-v2",
+	.create = vgic_create,
+	.destroy = vgic_destroy,
+	.set_attr = vgic_v2_set_attr,
+	.get_attr = vgic_v2_get_attr,
+	.has_attr = vgic_v2_has_attr,
+};
+
+int vgic_v3_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr,
+		       struct vgic_reg_attr *reg_attr)
+{
+	unsigned long vgic_mpidr, mpidr_reg;
+
+	/*
+	 * For KVM_DEV_ARM_VGIC_GRP_DIST_REGS group,
+	 * attr might not hold MPIDR. Hence assume vcpu0.
+	 */
+	if (attr->group != KVM_DEV_ARM_VGIC_GRP_DIST_REGS) {
+		vgic_mpidr = (attr->attr & KVM_DEV_ARM_VGIC_V3_MPIDR_MASK) >>
+			      KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT;
+
+		mpidr_reg = VGIC_TO_MPIDR(vgic_mpidr);
+		reg_attr->vcpu = kvm_mpidr_to_vcpu(dev->kvm, mpidr_reg);
+	} else {
+		reg_attr->vcpu = kvm_get_vcpu(dev->kvm, 0);
+	}
+
+	if (!reg_attr->vcpu)
+		return -EINVAL;
+
+	reg_attr->addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+
+	return 0;
+}
+
+/*
+ * vgic_v3_attr_regs_access - allows user space to access VGIC v3 state
+ *
+ * @dev:      kvm device handle
+ * @attr:     kvm device attribute
+ * @is_write: true if userspace is writing a register
+ */
+static int vgic_v3_attr_regs_access(struct kvm_device *dev,
+				    struct kvm_device_attr *attr,
+				    bool is_write)
+{
+	struct vgic_reg_attr reg_attr;
+	gpa_t addr;
+	struct kvm_vcpu *vcpu;
+	bool uaccess;
+	u32 val;
+	int ret;
+
+	ret = vgic_v3_parse_attr(dev, attr, &reg_attr);
+	if (ret)
+		return ret;
+
+	vcpu = reg_attr.vcpu;
+	addr = reg_attr.addr;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+		/* Sysregs uaccess is performed by the sysreg handling code */
+		uaccess = false;
+		break;
+	default:
+		uaccess = true;
+	}
+
+	if (uaccess && is_write) {
+		u32 __user *uaddr = (u32 __user *)(unsigned long)attr->addr;
+		if (get_user(val, uaddr))
+			return -EFAULT;
+	}
+
+	mutex_lock(&dev->kvm->lock);
+
+	if (!lock_all_vcpus(dev->kvm)) {
+		mutex_unlock(&dev->kvm->lock);
+		return -EBUSY;
+	}
+
+	mutex_lock(&dev->kvm->arch.config_lock);
+
+	if (unlikely(!vgic_initialized(dev->kvm))) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+		ret = vgic_v3_dist_uaccess(vcpu, is_write, addr, &val);
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:
+		ret = vgic_v3_redist_uaccess(vcpu, is_write, addr, &val);
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+		ret = vgic_v3_cpu_sysregs_uaccess(vcpu, attr, is_write);
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO: {
+		unsigned int info, intid;
+
+		info = (attr->attr & KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK) >>
+			KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT;
+		if (info == VGIC_LEVEL_INFO_LINE_LEVEL) {
+			intid = attr->attr &
+				KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK;
+			ret = vgic_v3_line_level_info_uaccess(vcpu, is_write,
+							      intid, &val);
+		} else {
+			ret = -EINVAL;
+		}
+		break;
+	}
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+out:
+	mutex_unlock(&dev->kvm->arch.config_lock);
+	unlock_all_vcpus(dev->kvm);
+	mutex_unlock(&dev->kvm->lock);
+
+	if (!ret && uaccess && !is_write) {
+		u32 __user *uaddr = (u32 __user *)(unsigned long)attr->addr;
+		ret = put_user(val, uaddr);
+	}
+
+	return ret;
+}
+
+static int vgic_v3_set_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+	case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO:
+		return vgic_v3_attr_regs_access(dev, attr, true);
+	default:
+		return vgic_set_common_attr(dev, attr);
+	}
+}
+
+static int vgic_v3_get_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+	case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO:
+		return vgic_v3_attr_regs_access(dev, attr, false);
+	default:
+		return vgic_get_common_attr(dev, attr);
+	}
+}
+
+static int vgic_v3_has_attr(struct kvm_device *dev,
+			    struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+		switch (attr->attr) {
+		case KVM_VGIC_V3_ADDR_TYPE_DIST:
+		case KVM_VGIC_V3_ADDR_TYPE_REDIST:
+		case KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION:
+			return 0;
+		}
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+		return vgic_v3_has_attr_regs(dev, attr);
+	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
+		return 0;
+	case KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO: {
+		if (((attr->attr & KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK) >>
+		      KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT) ==
+		      VGIC_LEVEL_INFO_LINE_LEVEL)
+			return 0;
+		break;
+	}
+	case KVM_DEV_ARM_VGIC_GRP_CTRL:
+		switch (attr->attr) {
+		case KVM_DEV_ARM_VGIC_CTRL_INIT:
+			return 0;
+		case KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES:
+			return 0;
+		}
+	}
+	return -ENXIO;
+}
+
+struct kvm_device_ops kvm_arm_vgic_v3_ops = {
+	.name = "kvm-arm-vgic-v3",
+	.create = vgic_create,
+	.destroy = vgic_destroy,
+	.set_attr = vgic_v3_set_attr,
+	.get_attr = vgic_v3_get_attr,
+	.has_attr = vgic_v3_has_attr,
+};
diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v2.c b/arch/arm64/kvm/vgic/vgic-mmio-v2.c
new file mode 100644
index 000000000..e070cda86
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-mmio-v2.c
@@ -0,0 +1,561 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VGICv2 MMIO handling functions
+ */
+
+#include <linux/irqchip/arm-gic.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/nospec.h>
+
+#include <kvm/iodev.h>
+#include <kvm/arm_vgic.h>
+
+#include "vgic.h"
+#include "vgic-mmio.h"
+
+/*
+ * The Revision field in the IIDR have the following meanings:
+ *
+ * Revision 1: Report GICv2 interrupts as group 0 instead of group 1
+ * Revision 2: Interrupt groups are guest-configurable and signaled using
+ * 	       their configured groups.
+ */
+
+static unsigned long vgic_mmio_read_v2_misc(struct kvm_vcpu *vcpu,
+					    gpa_t addr, unsigned int len)
+{
+	struct vgic_dist *vgic = &vcpu->kvm->arch.vgic;
+	u32 value;
+
+	switch (addr & 0x0c) {
+	case GIC_DIST_CTRL:
+		value = vgic->enabled ? GICD_ENABLE : 0;
+		break;
+	case GIC_DIST_CTR:
+		value = vgic->nr_spis + VGIC_NR_PRIVATE_IRQS;
+		value = (value >> 5) - 1;
+		value |= (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
+		break;
+	case GIC_DIST_IIDR:
+		value = (PRODUCT_ID_KVM << GICD_IIDR_PRODUCT_ID_SHIFT) |
+			(vgic->implementation_rev << GICD_IIDR_REVISION_SHIFT) |
+			(IMPLEMENTER_ARM << GICD_IIDR_IMPLEMENTER_SHIFT);
+		break;
+	default:
+		return 0;
+	}
+
+	return value;
+}
+
+static void vgic_mmio_write_v2_misc(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len,
+				    unsigned long val)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	bool was_enabled = dist->enabled;
+
+	switch (addr & 0x0c) {
+	case GIC_DIST_CTRL:
+		dist->enabled = val & GICD_ENABLE;
+		if (!was_enabled && dist->enabled)
+			vgic_kick_vcpus(vcpu->kvm);
+		break;
+	case GIC_DIST_CTR:
+	case GIC_DIST_IIDR:
+		/* Nothing to do */
+		return;
+	}
+}
+
+static int vgic_mmio_uaccess_write_v2_misc(struct kvm_vcpu *vcpu,
+					   gpa_t addr, unsigned int len,
+					   unsigned long val)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	u32 reg;
+
+	switch (addr & 0x0c) {
+	case GIC_DIST_IIDR:
+		reg = vgic_mmio_read_v2_misc(vcpu, addr, len);
+		if ((reg ^ val) & ~GICD_IIDR_REVISION_MASK)
+			return -EINVAL;
+
+		/*
+		 * If we observe a write to GICD_IIDR we know that userspace
+		 * has been updated and has had a chance to cope with older
+		 * kernels (VGICv2 IIDR.Revision == 0) incorrectly reporting
+		 * interrupts as group 1, and therefore we now allow groups to
+		 * be user writable.  Doing this by default would break
+		 * migration from old kernels to new kernels with legacy
+		 * userspace.
+		 */
+		reg = FIELD_GET(GICD_IIDR_REVISION_MASK, reg);
+		switch (reg) {
+		case KVM_VGIC_IMP_REV_2:
+		case KVM_VGIC_IMP_REV_3:
+			vcpu->kvm->arch.vgic.v2_groups_user_writable = true;
+			dist->implementation_rev = reg;
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	vgic_mmio_write_v2_misc(vcpu, addr, len, val);
+	return 0;
+}
+
+static int vgic_mmio_uaccess_write_v2_group(struct kvm_vcpu *vcpu,
+					    gpa_t addr, unsigned int len,
+					    unsigned long val)
+{
+	if (vcpu->kvm->arch.vgic.v2_groups_user_writable)
+		vgic_mmio_write_group(vcpu, addr, len, val);
+
+	return 0;
+}
+
+static void vgic_mmio_write_sgir(struct kvm_vcpu *source_vcpu,
+				 gpa_t addr, unsigned int len,
+				 unsigned long val)
+{
+	int nr_vcpus = atomic_read(&source_vcpu->kvm->online_vcpus);
+	int intid = val & 0xf;
+	int targets = (val >> 16) & 0xff;
+	int mode = (val >> 24) & 0x03;
+	struct kvm_vcpu *vcpu;
+	unsigned long flags, c;
+
+	switch (mode) {
+	case 0x0:		/* as specified by targets */
+		break;
+	case 0x1:
+		targets = (1U << nr_vcpus) - 1;			/* all, ... */
+		targets &= ~(1U << source_vcpu->vcpu_id);	/* but self */
+		break;
+	case 0x2:		/* this very vCPU only */
+		targets = (1U << source_vcpu->vcpu_id);
+		break;
+	case 0x3:		/* reserved */
+		return;
+	}
+
+	kvm_for_each_vcpu(c, vcpu, source_vcpu->kvm) {
+		struct vgic_irq *irq;
+
+		if (!(targets & (1U << c)))
+			continue;
+
+		irq = vgic_get_irq(source_vcpu->kvm, vcpu, intid);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		irq->pending_latch = true;
+		irq->source |= 1U << source_vcpu->vcpu_id;
+
+		vgic_queue_irq_unlock(source_vcpu->kvm, irq, flags);
+		vgic_put_irq(source_vcpu->kvm, irq);
+	}
+}
+
+static unsigned long vgic_mmio_read_target(struct kvm_vcpu *vcpu,
+					   gpa_t addr, unsigned int len)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
+	int i;
+	u64 val = 0;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		val |= (u64)irq->targets << (i * 8);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return val;
+}
+
+static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
+				   gpa_t addr, unsigned int len,
+				   unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
+	u8 cpu_mask = GENMASK(atomic_read(&vcpu->kvm->online_vcpus) - 1, 0);
+	int i;
+	unsigned long flags;
+
+	/* GICD_ITARGETSR[0-7] are read-only */
+	if (intid < VGIC_NR_PRIVATE_IRQS)
+		return;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid + i);
+		int target;
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		irq->targets = (val >> (i * 8)) & cpu_mask;
+		target = irq->targets ? __ffs(irq->targets) : 0;
+		irq->target_vcpu = kvm_get_vcpu(vcpu->kvm, target);
+
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+static unsigned long vgic_mmio_read_sgipend(struct kvm_vcpu *vcpu,
+					    gpa_t addr, unsigned int len)
+{
+	u32 intid = addr & 0x0f;
+	int i;
+	u64 val = 0;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		val |= (u64)irq->source << (i * 8);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+	return val;
+}
+
+static void vgic_mmio_write_sgipendc(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	u32 intid = addr & 0x0f;
+	int i;
+	unsigned long flags;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		irq->source &= ~((val >> (i * 8)) & 0xff);
+		if (!irq->source)
+			irq->pending_latch = false;
+
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+static void vgic_mmio_write_sgipends(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	u32 intid = addr & 0x0f;
+	int i;
+	unsigned long flags;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		irq->source |= (val >> (i * 8)) & 0xff;
+
+		if (irq->source) {
+			irq->pending_latch = true;
+			vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+		} else {
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		}
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+#define GICC_ARCH_VERSION_V2	0x2
+
+/* These are for userland accesses only, there is no guest-facing emulation. */
+static unsigned long vgic_mmio_read_vcpuif(struct kvm_vcpu *vcpu,
+					   gpa_t addr, unsigned int len)
+{
+	struct vgic_vmcr vmcr;
+	u32 val;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+
+	switch (addr & 0xff) {
+	case GIC_CPU_CTRL:
+		val = vmcr.grpen0 << GIC_CPU_CTRL_EnableGrp0_SHIFT;
+		val |= vmcr.grpen1 << GIC_CPU_CTRL_EnableGrp1_SHIFT;
+		val |= vmcr.ackctl << GIC_CPU_CTRL_AckCtl_SHIFT;
+		val |= vmcr.fiqen << GIC_CPU_CTRL_FIQEn_SHIFT;
+		val |= vmcr.cbpr << GIC_CPU_CTRL_CBPR_SHIFT;
+		val |= vmcr.eoim << GIC_CPU_CTRL_EOImodeNS_SHIFT;
+
+		break;
+	case GIC_CPU_PRIMASK:
+		/*
+		 * Our KVM_DEV_TYPE_ARM_VGIC_V2 device ABI exports the
+		 * PMR field as GICH_VMCR.VMPriMask rather than
+		 * GICC_PMR.Priority, so we expose the upper five bits of
+		 * priority mask to userspace using the lower bits in the
+		 * unsigned long.
+		 */
+		val = (vmcr.pmr & GICV_PMR_PRIORITY_MASK) >>
+			GICV_PMR_PRIORITY_SHIFT;
+		break;
+	case GIC_CPU_BINPOINT:
+		val = vmcr.bpr;
+		break;
+	case GIC_CPU_ALIAS_BINPOINT:
+		val = vmcr.abpr;
+		break;
+	case GIC_CPU_IDENT:
+		val = ((PRODUCT_ID_KVM << 20) |
+		       (GICC_ARCH_VERSION_V2 << 16) |
+		       IMPLEMENTER_ARM);
+		break;
+	default:
+		return 0;
+	}
+
+	return val;
+}
+
+static void vgic_mmio_write_vcpuif(struct kvm_vcpu *vcpu,
+				   gpa_t addr, unsigned int len,
+				   unsigned long val)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+
+	switch (addr & 0xff) {
+	case GIC_CPU_CTRL:
+		vmcr.grpen0 = !!(val & GIC_CPU_CTRL_EnableGrp0);
+		vmcr.grpen1 = !!(val & GIC_CPU_CTRL_EnableGrp1);
+		vmcr.ackctl = !!(val & GIC_CPU_CTRL_AckCtl);
+		vmcr.fiqen = !!(val & GIC_CPU_CTRL_FIQEn);
+		vmcr.cbpr = !!(val & GIC_CPU_CTRL_CBPR);
+		vmcr.eoim = !!(val & GIC_CPU_CTRL_EOImodeNS);
+
+		break;
+	case GIC_CPU_PRIMASK:
+		/*
+		 * Our KVM_DEV_TYPE_ARM_VGIC_V2 device ABI exports the
+		 * PMR field as GICH_VMCR.VMPriMask rather than
+		 * GICC_PMR.Priority, so we expose the upper five bits of
+		 * priority mask to userspace using the lower bits in the
+		 * unsigned long.
+		 */
+		vmcr.pmr = (val << GICV_PMR_PRIORITY_SHIFT) &
+			GICV_PMR_PRIORITY_MASK;
+		break;
+	case GIC_CPU_BINPOINT:
+		vmcr.bpr = val;
+		break;
+	case GIC_CPU_ALIAS_BINPOINT:
+		vmcr.abpr = val;
+		break;
+	}
+
+	vgic_set_vmcr(vcpu, &vmcr);
+}
+
+static unsigned long vgic_mmio_read_apr(struct kvm_vcpu *vcpu,
+					gpa_t addr, unsigned int len)
+{
+	int n; /* which APRn is this */
+
+	n = (addr >> 2) & 0x3;
+
+	if (kvm_vgic_global_state.type == VGIC_V2) {
+		/* GICv2 hardware systems support max. 32 groups */
+		if (n != 0)
+			return 0;
+		return vcpu->arch.vgic_cpu.vgic_v2.vgic_apr;
+	} else {
+		struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
+		if (n > vgic_v3_max_apr_idx(vcpu))
+			return 0;
+
+		n = array_index_nospec(n, 4);
+
+		/* GICv3 only uses ICH_AP1Rn for memory mapped (GICv2) guests */
+		return vgicv3->vgic_ap1r[n];
+	}
+}
+
+static void vgic_mmio_write_apr(struct kvm_vcpu *vcpu,
+				gpa_t addr, unsigned int len,
+				unsigned long val)
+{
+	int n; /* which APRn is this */
+
+	n = (addr >> 2) & 0x3;
+
+	if (kvm_vgic_global_state.type == VGIC_V2) {
+		/* GICv2 hardware systems support max. 32 groups */
+		if (n != 0)
+			return;
+		vcpu->arch.vgic_cpu.vgic_v2.vgic_apr = val;
+	} else {
+		struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
+		if (n > vgic_v3_max_apr_idx(vcpu))
+			return;
+
+		n = array_index_nospec(n, 4);
+
+		/* GICv3 only uses ICH_AP1Rn for memory mapped (GICv2) guests */
+		vgicv3->vgic_ap1r[n] = val;
+	}
+}
+
+static const struct vgic_register_region vgic_v2_dist_registers[] = {
+	REGISTER_DESC_WITH_LENGTH_UACCESS(GIC_DIST_CTRL,
+		vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc,
+		NULL, vgic_mmio_uaccess_write_v2_misc,
+		12, VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
+		vgic_mmio_read_group, vgic_mmio_write_group,
+		NULL, vgic_mmio_uaccess_write_v2_group, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
+		vgic_mmio_read_enable, vgic_mmio_write_senable,
+		NULL, vgic_uaccess_write_senable, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_CLEAR,
+		vgic_mmio_read_enable, vgic_mmio_write_cenable,
+		NULL, vgic_uaccess_write_cenable, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_SET,
+		vgic_mmio_read_pending, vgic_mmio_write_spending,
+		vgic_uaccess_read_pending, vgic_uaccess_write_spending, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PENDING_CLEAR,
+		vgic_mmio_read_pending, vgic_mmio_write_cpending,
+		vgic_uaccess_read_pending, vgic_uaccess_write_cpending, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_SET,
+		vgic_mmio_read_active, vgic_mmio_write_sactive,
+		vgic_uaccess_read_active, vgic_mmio_uaccess_write_sactive, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_CLEAR,
+		vgic_mmio_read_active, vgic_mmio_write_cactive,
+		vgic_uaccess_read_active, vgic_mmio_uaccess_write_cactive, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI,
+		vgic_mmio_read_priority, vgic_mmio_write_priority, NULL, NULL,
+		8, VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET,
+		vgic_mmio_read_target, vgic_mmio_write_target, NULL, NULL, 8,
+		VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
+		vgic_mmio_read_config, vgic_mmio_write_config, NULL, NULL, 2,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SOFTINT,
+		vgic_mmio_read_raz, vgic_mmio_write_sgir, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
+		vgic_mmio_read_sgipend, vgic_mmio_write_sgipendc, 16,
+		VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_SET,
+		vgic_mmio_read_sgipend, vgic_mmio_write_sgipends, 16,
+		VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
+};
+
+static const struct vgic_register_region vgic_v2_cpu_registers[] = {
+	REGISTER_DESC_WITH_LENGTH(GIC_CPU_CTRL,
+		vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_CPU_PRIMASK,
+		vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_CPU_BINPOINT,
+		vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_CPU_ALIAS_BINPOINT,
+		vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_CPU_ACTIVEPRIO,
+		vgic_mmio_read_apr, vgic_mmio_write_apr, 16,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GIC_CPU_IDENT,
+		vgic_mmio_read_vcpuif, vgic_mmio_write_vcpuif, 4,
+		VGIC_ACCESS_32bit),
+};
+
+unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev)
+{
+	dev->regions = vgic_v2_dist_registers;
+	dev->nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
+
+	kvm_iodevice_init(&dev->dev, &kvm_io_gic_ops);
+
+	return SZ_4K;
+}
+
+int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+	const struct vgic_register_region *region;
+	struct vgic_io_device iodev;
+	struct vgic_reg_attr reg_attr;
+	struct kvm_vcpu *vcpu;
+	gpa_t addr;
+	int ret;
+
+	ret = vgic_v2_parse_attr(dev, attr, &reg_attr);
+	if (ret)
+		return ret;
+
+	vcpu = reg_attr.vcpu;
+	addr = reg_attr.addr;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+		iodev.regions = vgic_v2_dist_registers;
+		iodev.nr_regions = ARRAY_SIZE(vgic_v2_dist_registers);
+		iodev.base_addr = 0;
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+		iodev.regions = vgic_v2_cpu_registers;
+		iodev.nr_regions = ARRAY_SIZE(vgic_v2_cpu_registers);
+		iodev.base_addr = 0;
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	/* We only support aligned 32-bit accesses. */
+	if (addr & 3)
+		return -ENXIO;
+
+	region = vgic_get_mmio_region(vcpu, &iodev, addr, sizeof(u32));
+	if (!region)
+		return -ENXIO;
+
+	return 0;
+}
+
+int vgic_v2_cpuif_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			  int offset, u32 *val)
+{
+	struct vgic_io_device dev = {
+		.regions = vgic_v2_cpu_registers,
+		.nr_regions = ARRAY_SIZE(vgic_v2_cpu_registers),
+		.iodev_type = IODEV_CPUIF,
+	};
+
+	return vgic_uaccess(vcpu, &dev, is_write, offset, val);
+}
+
+int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			 int offset, u32 *val)
+{
+	struct vgic_io_device dev = {
+		.regions = vgic_v2_dist_registers,
+		.nr_regions = ARRAY_SIZE(vgic_v2_dist_registers),
+		.iodev_type = IODEV_DIST,
+	};
+
+	return vgic_uaccess(vcpu, &dev, is_write, offset, val);
+}
diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
new file mode 100644
index 000000000..ae5a3a717
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
@@ -0,0 +1,1186 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VGICv3 MMIO handling functions
+ */
+
+#include <linux/bitfield.h>
+#include <linux/irqchip/arm-gic-v3.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+#include <kvm/iodev.h>
+#include <kvm/arm_vgic.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+
+#include "vgic.h"
+#include "vgic-mmio.h"
+
+/* extract @num bytes at @offset bytes offset in data */
+unsigned long extract_bytes(u64 data, unsigned int offset,
+			    unsigned int num)
+{
+	return (data >> (offset * 8)) & GENMASK_ULL(num * 8 - 1, 0);
+}
+
+/* allows updates of any half of a 64-bit register (or the whole thing) */
+u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
+		     unsigned long val)
+{
+	int lower = (offset & 4) * 8;
+	int upper = lower + 8 * len - 1;
+
+	reg &= ~GENMASK_ULL(upper, lower);
+	val &= GENMASK_ULL(len * 8 - 1, 0);
+
+	return reg | ((u64)val << lower);
+}
+
+bool vgic_has_its(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+
+	if (dist->vgic_model != KVM_DEV_TYPE_ARM_VGIC_V3)
+		return false;
+
+	return dist->has_its;
+}
+
+bool vgic_supports_direct_msis(struct kvm *kvm)
+{
+	return (kvm_vgic_global_state.has_gicv4_1 ||
+		(kvm_vgic_global_state.has_gicv4 && vgic_has_its(kvm)));
+}
+
+/*
+ * The Revision field in the IIDR have the following meanings:
+ *
+ * Revision 2: Interrupt groups are guest-configurable and signaled using
+ * 	       their configured groups.
+ */
+
+static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
+					    gpa_t addr, unsigned int len)
+{
+	struct vgic_dist *vgic = &vcpu->kvm->arch.vgic;
+	u32 value = 0;
+
+	switch (addr & 0x0c) {
+	case GICD_CTLR:
+		if (vgic->enabled)
+			value |= GICD_CTLR_ENABLE_SS_G1;
+		value |= GICD_CTLR_ARE_NS | GICD_CTLR_DS;
+		if (vgic->nassgireq)
+			value |= GICD_CTLR_nASSGIreq;
+		break;
+	case GICD_TYPER:
+		value = vgic->nr_spis + VGIC_NR_PRIVATE_IRQS;
+		value = (value >> 5) - 1;
+		if (vgic_has_its(vcpu->kvm)) {
+			value |= (INTERRUPT_ID_BITS_ITS - 1) << 19;
+			value |= GICD_TYPER_LPIS;
+		} else {
+			value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19;
+		}
+		break;
+	case GICD_TYPER2:
+		if (kvm_vgic_global_state.has_gicv4_1 && gic_cpuif_has_vsgi())
+			value = GICD_TYPER2_nASSGIcap;
+		break;
+	case GICD_IIDR:
+		value = (PRODUCT_ID_KVM << GICD_IIDR_PRODUCT_ID_SHIFT) |
+			(vgic->implementation_rev << GICD_IIDR_REVISION_SHIFT) |
+			(IMPLEMENTER_ARM << GICD_IIDR_IMPLEMENTER_SHIFT);
+		break;
+	default:
+		return 0;
+	}
+
+	return value;
+}
+
+static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len,
+				    unsigned long val)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	switch (addr & 0x0c) {
+	case GICD_CTLR: {
+		bool was_enabled, is_hwsgi;
+
+		mutex_lock(&vcpu->kvm->arch.config_lock);
+
+		was_enabled = dist->enabled;
+		is_hwsgi = dist->nassgireq;
+
+		dist->enabled = val & GICD_CTLR_ENABLE_SS_G1;
+
+		/* Not a GICv4.1? No HW SGIs */
+		if (!kvm_vgic_global_state.has_gicv4_1 || !gic_cpuif_has_vsgi())
+			val &= ~GICD_CTLR_nASSGIreq;
+
+		/* Dist stays enabled? nASSGIreq is RO */
+		if (was_enabled && dist->enabled) {
+			val &= ~GICD_CTLR_nASSGIreq;
+			val |= FIELD_PREP(GICD_CTLR_nASSGIreq, is_hwsgi);
+		}
+
+		/* Switching HW SGIs? */
+		dist->nassgireq = val & GICD_CTLR_nASSGIreq;
+		if (is_hwsgi != dist->nassgireq)
+			vgic_v4_configure_vsgis(vcpu->kvm);
+
+		if (kvm_vgic_global_state.has_gicv4_1 &&
+		    was_enabled != dist->enabled)
+			kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_RELOAD_GICv4);
+		else if (!was_enabled && dist->enabled)
+			vgic_kick_vcpus(vcpu->kvm);
+
+		mutex_unlock(&vcpu->kvm->arch.config_lock);
+		break;
+	}
+	case GICD_TYPER:
+	case GICD_TYPER2:
+	case GICD_IIDR:
+		/* This is at best for documentation purposes... */
+		return;
+	}
+}
+
+static int vgic_mmio_uaccess_write_v3_misc(struct kvm_vcpu *vcpu,
+					   gpa_t addr, unsigned int len,
+					   unsigned long val)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	u32 reg;
+
+	switch (addr & 0x0c) {
+	case GICD_TYPER2:
+		if (val != vgic_mmio_read_v3_misc(vcpu, addr, len))
+			return -EINVAL;
+		return 0;
+	case GICD_IIDR:
+		reg = vgic_mmio_read_v3_misc(vcpu, addr, len);
+		if ((reg ^ val) & ~GICD_IIDR_REVISION_MASK)
+			return -EINVAL;
+
+		reg = FIELD_GET(GICD_IIDR_REVISION_MASK, reg);
+		switch (reg) {
+		case KVM_VGIC_IMP_REV_2:
+		case KVM_VGIC_IMP_REV_3:
+			dist->implementation_rev = reg;
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	case GICD_CTLR:
+		/* Not a GICv4.1? No HW SGIs */
+		if (!kvm_vgic_global_state.has_gicv4_1)
+			val &= ~GICD_CTLR_nASSGIreq;
+
+		dist->enabled = val & GICD_CTLR_ENABLE_SS_G1;
+		dist->nassgireq = val & GICD_CTLR_nASSGIreq;
+		return 0;
+	}
+
+	vgic_mmio_write_v3_misc(vcpu, addr, len, val);
+	return 0;
+}
+
+static unsigned long vgic_mmio_read_irouter(struct kvm_vcpu *vcpu,
+					    gpa_t addr, unsigned int len)
+{
+	int intid = VGIC_ADDR_TO_INTID(addr, 64);
+	struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, NULL, intid);
+	unsigned long ret = 0;
+
+	if (!irq)
+		return 0;
+
+	/* The upper word is RAZ for us. */
+	if (!(addr & 4))
+		ret = extract_bytes(READ_ONCE(irq->mpidr), addr & 7, len);
+
+	vgic_put_irq(vcpu->kvm, irq);
+	return ret;
+}
+
+static void vgic_mmio_write_irouter(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len,
+				    unsigned long val)
+{
+	int intid = VGIC_ADDR_TO_INTID(addr, 64);
+	struct vgic_irq *irq;
+	unsigned long flags;
+
+	/* The upper word is WI for us since we don't implement Aff3. */
+	if (addr & 4)
+		return;
+
+	irq = vgic_get_irq(vcpu->kvm, NULL, intid);
+
+	if (!irq)
+		return;
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+	/* We only care about and preserve Aff0, Aff1 and Aff2. */
+	irq->mpidr = val & GENMASK(23, 0);
+	irq->target_vcpu = kvm_mpidr_to_vcpu(vcpu->kvm, irq->mpidr);
+
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+	vgic_put_irq(vcpu->kvm, irq);
+}
+
+bool vgic_lpis_enabled(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+	return atomic_read(&vgic_cpu->ctlr) == GICR_CTLR_ENABLE_LPIS;
+}
+
+static unsigned long vgic_mmio_read_v3r_ctlr(struct kvm_vcpu *vcpu,
+					     gpa_t addr, unsigned int len)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	unsigned long val;
+
+	val = atomic_read(&vgic_cpu->ctlr);
+	if (vgic_get_implementation_rev(vcpu) >= KVM_VGIC_IMP_REV_3)
+		val |= GICR_CTLR_IR | GICR_CTLR_CES;
+
+	return val;
+}
+
+static void vgic_mmio_write_v3r_ctlr(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	u32 ctlr;
+
+	if (!vgic_has_its(vcpu->kvm))
+		return;
+
+	if (!(val & GICR_CTLR_ENABLE_LPIS)) {
+		/*
+		 * Don't disable if RWP is set, as there already an
+		 * ongoing disable. Funky guest...
+		 */
+		ctlr = atomic_cmpxchg_acquire(&vgic_cpu->ctlr,
+					      GICR_CTLR_ENABLE_LPIS,
+					      GICR_CTLR_RWP);
+		if (ctlr != GICR_CTLR_ENABLE_LPIS)
+			return;
+
+		vgic_flush_pending_lpis(vcpu);
+		vgic_its_invalidate_cache(vcpu->kvm);
+		atomic_set_release(&vgic_cpu->ctlr, 0);
+	} else {
+		ctlr = atomic_cmpxchg_acquire(&vgic_cpu->ctlr, 0,
+					      GICR_CTLR_ENABLE_LPIS);
+		if (ctlr != 0)
+			return;
+
+		vgic_enable_lpis(vcpu);
+	}
+}
+
+static bool vgic_mmio_vcpu_rdist_is_last(struct kvm_vcpu *vcpu)
+{
+	struct vgic_dist *vgic = &vcpu->kvm->arch.vgic;
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_redist_region *iter, *rdreg = vgic_cpu->rdreg;
+
+	if (!rdreg)
+		return false;
+
+	if (vgic_cpu->rdreg_index < rdreg->free_index - 1) {
+		return false;
+	} else if (rdreg->count && vgic_cpu->rdreg_index == (rdreg->count - 1)) {
+		struct list_head *rd_regions = &vgic->rd_regions;
+		gpa_t end = rdreg->base + rdreg->count * KVM_VGIC_V3_REDIST_SIZE;
+
+		/*
+		 * the rdist is the last one of the redist region,
+		 * check whether there is no other contiguous rdist region
+		 */
+		list_for_each_entry(iter, rd_regions, list) {
+			if (iter->base == end && iter->free_index > 0)
+				return false;
+		}
+	}
+	return true;
+}
+
+static unsigned long vgic_mmio_read_v3r_typer(struct kvm_vcpu *vcpu,
+					      gpa_t addr, unsigned int len)
+{
+	unsigned long mpidr = kvm_vcpu_get_mpidr_aff(vcpu);
+	int target_vcpu_id = vcpu->vcpu_id;
+	u64 value;
+
+	value = (u64)(mpidr & GENMASK(23, 0)) << 32;
+	value |= ((target_vcpu_id & 0xffff) << 8);
+
+	if (vgic_has_its(vcpu->kvm))
+		value |= GICR_TYPER_PLPIS;
+
+	if (vgic_mmio_vcpu_rdist_is_last(vcpu))
+		value |= GICR_TYPER_LAST;
+
+	return extract_bytes(value, addr & 7, len);
+}
+
+static unsigned long vgic_mmio_read_v3r_iidr(struct kvm_vcpu *vcpu,
+					     gpa_t addr, unsigned int len)
+{
+	return (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
+}
+
+static unsigned long vgic_mmio_read_v3_idregs(struct kvm_vcpu *vcpu,
+					      gpa_t addr, unsigned int len)
+{
+	switch (addr & 0xffff) {
+	case GICD_PIDR2:
+		/* report a GICv3 compliant implementation */
+		return 0x3b;
+	}
+
+	return 0;
+}
+
+static int vgic_v3_uaccess_write_pending(struct kvm_vcpu *vcpu,
+					 gpa_t addr, unsigned int len,
+					 unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for (i = 0; i < len * 8; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		/*
+		 * pending_latch is set irrespective of irq type
+		 * (level or edge) to avoid dependency that VM should
+		 * restore irq config before pending info.
+		 */
+		irq->pending_latch = test_bit(i, &val);
+
+		if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+			irq_set_irqchip_state(irq->host_irq,
+					      IRQCHIP_STATE_PENDING,
+					      irq->pending_latch);
+			irq->pending_latch = false;
+		}
+
+		if (irq->pending_latch)
+			vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+		else
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return 0;
+}
+
+/* We want to avoid outer shareable. */
+u64 vgic_sanitise_shareability(u64 field)
+{
+	switch (field) {
+	case GIC_BASER_OuterShareable:
+		return GIC_BASER_InnerShareable;
+	default:
+		return field;
+	}
+}
+
+/* Avoid any inner non-cacheable mapping. */
+u64 vgic_sanitise_inner_cacheability(u64 field)
+{
+	switch (field) {
+	case GIC_BASER_CACHE_nCnB:
+	case GIC_BASER_CACHE_nC:
+		return GIC_BASER_CACHE_RaWb;
+	default:
+		return field;
+	}
+}
+
+/* Non-cacheable or same-as-inner are OK. */
+u64 vgic_sanitise_outer_cacheability(u64 field)
+{
+	switch (field) {
+	case GIC_BASER_CACHE_SameAsInner:
+	case GIC_BASER_CACHE_nC:
+		return field;
+	default:
+		return GIC_BASER_CACHE_SameAsInner;
+	}
+}
+
+u64 vgic_sanitise_field(u64 reg, u64 field_mask, int field_shift,
+			u64 (*sanitise_fn)(u64))
+{
+	u64 field = (reg & field_mask) >> field_shift;
+
+	field = sanitise_fn(field) << field_shift;
+	return (reg & ~field_mask) | field;
+}
+
+#define PROPBASER_RES0_MASK						\
+	(GENMASK_ULL(63, 59) | GENMASK_ULL(55, 52) | GENMASK_ULL(6, 5))
+#define PENDBASER_RES0_MASK						\
+	(BIT_ULL(63) | GENMASK_ULL(61, 59) | GENMASK_ULL(55, 52) |	\
+	 GENMASK_ULL(15, 12) | GENMASK_ULL(6, 0))
+
+static u64 vgic_sanitise_pendbaser(u64 reg)
+{
+	reg = vgic_sanitise_field(reg, GICR_PENDBASER_SHAREABILITY_MASK,
+				  GICR_PENDBASER_SHAREABILITY_SHIFT,
+				  vgic_sanitise_shareability);
+	reg = vgic_sanitise_field(reg, GICR_PENDBASER_INNER_CACHEABILITY_MASK,
+				  GICR_PENDBASER_INNER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_inner_cacheability);
+	reg = vgic_sanitise_field(reg, GICR_PENDBASER_OUTER_CACHEABILITY_MASK,
+				  GICR_PENDBASER_OUTER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_outer_cacheability);
+
+	reg &= ~PENDBASER_RES0_MASK;
+
+	return reg;
+}
+
+static u64 vgic_sanitise_propbaser(u64 reg)
+{
+	reg = vgic_sanitise_field(reg, GICR_PROPBASER_SHAREABILITY_MASK,
+				  GICR_PROPBASER_SHAREABILITY_SHIFT,
+				  vgic_sanitise_shareability);
+	reg = vgic_sanitise_field(reg, GICR_PROPBASER_INNER_CACHEABILITY_MASK,
+				  GICR_PROPBASER_INNER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_inner_cacheability);
+	reg = vgic_sanitise_field(reg, GICR_PROPBASER_OUTER_CACHEABILITY_MASK,
+				  GICR_PROPBASER_OUTER_CACHEABILITY_SHIFT,
+				  vgic_sanitise_outer_cacheability);
+
+	reg &= ~PROPBASER_RES0_MASK;
+	return reg;
+}
+
+static unsigned long vgic_mmio_read_propbase(struct kvm_vcpu *vcpu,
+					     gpa_t addr, unsigned int len)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	return extract_bytes(dist->propbaser, addr & 7, len);
+}
+
+static void vgic_mmio_write_propbase(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	u64 old_propbaser, propbaser;
+
+	/* Storing a value with LPIs already enabled is undefined */
+	if (vgic_lpis_enabled(vcpu))
+		return;
+
+	do {
+		old_propbaser = READ_ONCE(dist->propbaser);
+		propbaser = old_propbaser;
+		propbaser = update_64bit_reg(propbaser, addr & 4, len, val);
+		propbaser = vgic_sanitise_propbaser(propbaser);
+	} while (cmpxchg64(&dist->propbaser, old_propbaser,
+			   propbaser) != old_propbaser);
+}
+
+static unsigned long vgic_mmio_read_pendbase(struct kvm_vcpu *vcpu,
+					     gpa_t addr, unsigned int len)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	u64 value = vgic_cpu->pendbaser;
+
+	value &= ~GICR_PENDBASER_PTZ;
+
+	return extract_bytes(value, addr & 7, len);
+}
+
+static void vgic_mmio_write_pendbase(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	u64 old_pendbaser, pendbaser;
+
+	/* Storing a value with LPIs already enabled is undefined */
+	if (vgic_lpis_enabled(vcpu))
+		return;
+
+	do {
+		old_pendbaser = READ_ONCE(vgic_cpu->pendbaser);
+		pendbaser = old_pendbaser;
+		pendbaser = update_64bit_reg(pendbaser, addr & 4, len, val);
+		pendbaser = vgic_sanitise_pendbaser(pendbaser);
+	} while (cmpxchg64(&vgic_cpu->pendbaser, old_pendbaser,
+			   pendbaser) != old_pendbaser);
+}
+
+static unsigned long vgic_mmio_read_sync(struct kvm_vcpu *vcpu,
+					 gpa_t addr, unsigned int len)
+{
+	return !!atomic_read(&vcpu->arch.vgic_cpu.syncr_busy);
+}
+
+static void vgic_set_rdist_busy(struct kvm_vcpu *vcpu, bool busy)
+{
+	if (busy) {
+		atomic_inc(&vcpu->arch.vgic_cpu.syncr_busy);
+		smp_mb__after_atomic();
+	} else {
+		smp_mb__before_atomic();
+		atomic_dec(&vcpu->arch.vgic_cpu.syncr_busy);
+	}
+}
+
+static void vgic_mmio_write_invlpi(struct kvm_vcpu *vcpu,
+				   gpa_t addr, unsigned int len,
+				   unsigned long val)
+{
+	struct vgic_irq *irq;
+
+	/*
+	 * If the guest wrote only to the upper 32bit part of the
+	 * register, drop the write on the floor, as it is only for
+	 * vPEs (which we don't support for obvious reasons).
+	 *
+	 * Also discard the access if LPIs are not enabled.
+	 */
+	if ((addr & 4) || !vgic_lpis_enabled(vcpu))
+		return;
+
+	vgic_set_rdist_busy(vcpu, true);
+
+	irq = vgic_get_irq(vcpu->kvm, NULL, lower_32_bits(val));
+	if (irq) {
+		vgic_its_inv_lpi(vcpu->kvm, irq);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	vgic_set_rdist_busy(vcpu, false);
+}
+
+static void vgic_mmio_write_invall(struct kvm_vcpu *vcpu,
+				   gpa_t addr, unsigned int len,
+				   unsigned long val)
+{
+	/* See vgic_mmio_write_invlpi() for the early return rationale */
+	if ((addr & 4) || !vgic_lpis_enabled(vcpu))
+		return;
+
+	vgic_set_rdist_busy(vcpu, true);
+	vgic_its_invall(vcpu);
+	vgic_set_rdist_busy(vcpu, false);
+}
+
+/*
+ * The GICv3 per-IRQ registers are split to control PPIs and SGIs in the
+ * redistributors, while SPIs are covered by registers in the distributor
+ * block. Trying to set private IRQs in this block gets ignored.
+ * We take some special care here to fix the calculation of the register
+ * offset.
+ */
+#define REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(off, rd, wr, ur, uw, bpi, acc) \
+	{								\
+		.reg_offset = off,					\
+		.bits_per_irq = bpi,					\
+		.len = (bpi * VGIC_NR_PRIVATE_IRQS) / 8,		\
+		.access_flags = acc,					\
+		.read = vgic_mmio_read_raz,				\
+		.write = vgic_mmio_write_wi,				\
+	}, {								\
+		.reg_offset = off + (bpi * VGIC_NR_PRIVATE_IRQS) / 8,	\
+		.bits_per_irq = bpi,					\
+		.len = (bpi * (1024 - VGIC_NR_PRIVATE_IRQS)) / 8,	\
+		.access_flags = acc,					\
+		.read = rd,						\
+		.write = wr,						\
+		.uaccess_read = ur,					\
+		.uaccess_write = uw,					\
+	}
+
+static const struct vgic_register_region vgic_v3_dist_registers[] = {
+	REGISTER_DESC_WITH_LENGTH_UACCESS(GICD_CTLR,
+		vgic_mmio_read_v3_misc, vgic_mmio_write_v3_misc,
+		NULL, vgic_mmio_uaccess_write_v3_misc,
+		16, VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICD_STATUSR,
+		vgic_mmio_read_rao, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_IGROUPR,
+		vgic_mmio_read_group, vgic_mmio_write_group, NULL, NULL, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ISENABLER,
+		vgic_mmio_read_enable, vgic_mmio_write_senable,
+		NULL, vgic_uaccess_write_senable, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ICENABLER,
+		vgic_mmio_read_enable, vgic_mmio_write_cenable,
+	       NULL, vgic_uaccess_write_cenable, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ISPENDR,
+		vgic_mmio_read_pending, vgic_mmio_write_spending,
+		vgic_uaccess_read_pending, vgic_v3_uaccess_write_pending, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ICPENDR,
+		vgic_mmio_read_pending, vgic_mmio_write_cpending,
+		vgic_mmio_read_raz, vgic_mmio_uaccess_write_wi, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ISACTIVER,
+		vgic_mmio_read_active, vgic_mmio_write_sactive,
+		vgic_uaccess_read_active, vgic_mmio_uaccess_write_sactive, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ICACTIVER,
+		vgic_mmio_read_active, vgic_mmio_write_cactive,
+		vgic_uaccess_read_active, vgic_mmio_uaccess_write_cactive,
+		1, VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_IPRIORITYR,
+		vgic_mmio_read_priority, vgic_mmio_write_priority, NULL, NULL,
+		8, VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ITARGETSR,
+		vgic_mmio_read_raz, vgic_mmio_write_wi, NULL, NULL, 8,
+		VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ICFGR,
+		vgic_mmio_read_config, vgic_mmio_write_config, NULL, NULL, 2,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_IGRPMODR,
+		vgic_mmio_read_raz, vgic_mmio_write_wi, NULL, NULL, 1,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_IROUTER,
+		vgic_mmio_read_irouter, vgic_mmio_write_irouter, NULL, NULL, 64,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICD_IDREGS,
+		vgic_mmio_read_v3_idregs, vgic_mmio_write_wi, 48,
+		VGIC_ACCESS_32bit),
+};
+
+static const struct vgic_register_region vgic_v3_rd_registers[] = {
+	/* RD_base registers */
+	REGISTER_DESC_WITH_LENGTH(GICR_CTLR,
+		vgic_mmio_read_v3r_ctlr, vgic_mmio_write_v3r_ctlr, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_STATUSR,
+		vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_IIDR,
+		vgic_mmio_read_v3r_iidr, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH_UACCESS(GICR_TYPER,
+		vgic_mmio_read_v3r_typer, vgic_mmio_write_wi,
+		NULL, vgic_mmio_uaccess_write_wi, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_WAKER,
+		vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_PROPBASER,
+		vgic_mmio_read_propbase, vgic_mmio_write_propbase, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_PENDBASER,
+		vgic_mmio_read_pendbase, vgic_mmio_write_pendbase, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_INVLPIR,
+		vgic_mmio_read_raz, vgic_mmio_write_invlpi, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_INVALLR,
+		vgic_mmio_read_raz, vgic_mmio_write_invall, 8,
+		VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_SYNCR,
+		vgic_mmio_read_sync, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(GICR_IDREGS,
+		vgic_mmio_read_v3_idregs, vgic_mmio_write_wi, 48,
+		VGIC_ACCESS_32bit),
+	/* SGI_base registers */
+	REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_IGROUPR0,
+		vgic_mmio_read_group, vgic_mmio_write_group, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ISENABLER0,
+		vgic_mmio_read_enable, vgic_mmio_write_senable,
+		NULL, vgic_uaccess_write_senable, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ICENABLER0,
+		vgic_mmio_read_enable, vgic_mmio_write_cenable,
+		NULL, vgic_uaccess_write_cenable, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ISPENDR0,
+		vgic_mmio_read_pending, vgic_mmio_write_spending,
+		vgic_uaccess_read_pending, vgic_v3_uaccess_write_pending, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ICPENDR0,
+		vgic_mmio_read_pending, vgic_mmio_write_cpending,
+		vgic_mmio_read_raz, vgic_mmio_uaccess_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ISACTIVER0,
+		vgic_mmio_read_active, vgic_mmio_write_sactive,
+		vgic_uaccess_read_active, vgic_mmio_uaccess_write_sactive, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ICACTIVER0,
+		vgic_mmio_read_active, vgic_mmio_write_cactive,
+		vgic_uaccess_read_active, vgic_mmio_uaccess_write_cactive, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_IPRIORITYR0,
+		vgic_mmio_read_priority, vgic_mmio_write_priority, 32,
+		VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
+	REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_ICFGR0,
+		vgic_mmio_read_config, vgic_mmio_write_config, 8,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_IGRPMODR0,
+		vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+	REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_NSACR,
+		vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
+		VGIC_ACCESS_32bit),
+};
+
+unsigned int vgic_v3_init_dist_iodev(struct vgic_io_device *dev)
+{
+	dev->regions = vgic_v3_dist_registers;
+	dev->nr_regions = ARRAY_SIZE(vgic_v3_dist_registers);
+
+	kvm_iodevice_init(&dev->dev, &kvm_io_gic_ops);
+
+	return SZ_64K;
+}
+
+/**
+ * vgic_register_redist_iodev - register a single redist iodev
+ * @vcpu:    The VCPU to which the redistributor belongs
+ *
+ * Register a KVM iodev for this VCPU's redistributor using the address
+ * provided.
+ *
+ * Return 0 on success, -ERRNO otherwise.
+ */
+int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct vgic_dist *vgic = &kvm->arch.vgic;
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_io_device *rd_dev = &vcpu->arch.vgic_cpu.rd_iodev;
+	struct vgic_redist_region *rdreg;
+	gpa_t rd_base;
+	int ret = 0;
+
+	lockdep_assert_held(&kvm->slots_lock);
+	mutex_lock(&kvm->arch.config_lock);
+
+	if (!IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr))
+		goto out_unlock;
+
+	/*
+	 * We may be creating VCPUs before having set the base address for the
+	 * redistributor region, in which case we will come back to this
+	 * function for all VCPUs when the base address is set.  Just return
+	 * without doing any work for now.
+	 */
+	rdreg = vgic_v3_rdist_free_slot(&vgic->rd_regions);
+	if (!rdreg)
+		goto out_unlock;
+
+	if (!vgic_v3_check_base(kvm)) {
+		ret = -EINVAL;
+		goto out_unlock;
+	}
+
+	vgic_cpu->rdreg = rdreg;
+	vgic_cpu->rdreg_index = rdreg->free_index;
+
+	rd_base = rdreg->base + rdreg->free_index * KVM_VGIC_V3_REDIST_SIZE;
+
+	kvm_iodevice_init(&rd_dev->dev, &kvm_io_gic_ops);
+	rd_dev->base_addr = rd_base;
+	rd_dev->iodev_type = IODEV_REDIST;
+	rd_dev->regions = vgic_v3_rd_registers;
+	rd_dev->nr_regions = ARRAY_SIZE(vgic_v3_rd_registers);
+	rd_dev->redist_vcpu = vcpu;
+
+	mutex_unlock(&kvm->arch.config_lock);
+
+	ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, rd_base,
+				      2 * SZ_64K, &rd_dev->dev);
+	if (ret)
+		return ret;
+
+	/* Protected by slots_lock */
+	rdreg->free_index++;
+	return 0;
+
+out_unlock:
+	mutex_unlock(&kvm->arch.config_lock);
+	return ret;
+}
+
+void vgic_unregister_redist_iodev(struct kvm_vcpu *vcpu)
+{
+	struct vgic_io_device *rd_dev = &vcpu->arch.vgic_cpu.rd_iodev;
+
+	kvm_io_bus_unregister_dev(vcpu->kvm, KVM_MMIO_BUS, &rd_dev->dev);
+}
+
+static int vgic_register_all_redist_iodevs(struct kvm *kvm)
+{
+	struct kvm_vcpu *vcpu;
+	unsigned long c;
+	int ret = 0;
+
+	kvm_for_each_vcpu(c, vcpu, kvm) {
+		ret = vgic_register_redist_iodev(vcpu);
+		if (ret)
+			break;
+	}
+
+	if (ret) {
+		/* The current c failed, so iterate over the previous ones. */
+		int i;
+
+		for (i = 0; i < c; i++) {
+			vcpu = kvm_get_vcpu(kvm, i);
+			vgic_unregister_redist_iodev(vcpu);
+		}
+	}
+
+	return ret;
+}
+
+/**
+ * vgic_v3_alloc_redist_region - Allocate a new redistributor region
+ *
+ * Performs various checks before inserting the rdist region in the list.
+ * Those tests depend on whether the size of the rdist region is known
+ * (ie. count != 0). The list is sorted by rdist region index.
+ *
+ * @kvm: kvm handle
+ * @index: redist region index
+ * @base: base of the new rdist region
+ * @count: number of redistributors the region is made of (0 in the old style
+ * single region, whose size is induced from the number of vcpus)
+ *
+ * Return 0 on success, < 0 otherwise
+ */
+static int vgic_v3_alloc_redist_region(struct kvm *kvm, uint32_t index,
+				       gpa_t base, uint32_t count)
+{
+	struct vgic_dist *d = &kvm->arch.vgic;
+	struct vgic_redist_region *rdreg;
+	struct list_head *rd_regions = &d->rd_regions;
+	int nr_vcpus = atomic_read(&kvm->online_vcpus);
+	size_t size = count ? count * KVM_VGIC_V3_REDIST_SIZE
+			    : nr_vcpus * KVM_VGIC_V3_REDIST_SIZE;
+	int ret;
+
+	/* cross the end of memory ? */
+	if (base + size < base)
+		return -EINVAL;
+
+	if (list_empty(rd_regions)) {
+		if (index != 0)
+			return -EINVAL;
+	} else {
+		rdreg = list_last_entry(rd_regions,
+					struct vgic_redist_region, list);
+
+		/* Don't mix single region and discrete redist regions */
+		if (!count && rdreg->count)
+			return -EINVAL;
+
+		if (!count)
+			return -EEXIST;
+
+		if (index != rdreg->index + 1)
+			return -EINVAL;
+	}
+
+	/*
+	 * For legacy single-region redistributor regions (!count),
+	 * check that the redistributor region does not overlap with the
+	 * distributor's address space.
+	 */
+	if (!count && !IS_VGIC_ADDR_UNDEF(d->vgic_dist_base) &&
+		vgic_dist_overlap(kvm, base, size))
+		return -EINVAL;
+
+	/* collision with any other rdist region? */
+	if (vgic_v3_rdist_overlap(kvm, base, size))
+		return -EINVAL;
+
+	rdreg = kzalloc(sizeof(*rdreg), GFP_KERNEL_ACCOUNT);
+	if (!rdreg)
+		return -ENOMEM;
+
+	rdreg->base = VGIC_ADDR_UNDEF;
+
+	ret = vgic_check_iorange(kvm, rdreg->base, base, SZ_64K, size);
+	if (ret)
+		goto free;
+
+	rdreg->base = base;
+	rdreg->count = count;
+	rdreg->free_index = 0;
+	rdreg->index = index;
+
+	list_add_tail(&rdreg->list, rd_regions);
+	return 0;
+free:
+	kfree(rdreg);
+	return ret;
+}
+
+void vgic_v3_free_redist_region(struct vgic_redist_region *rdreg)
+{
+	list_del(&rdreg->list);
+	kfree(rdreg);
+}
+
+int vgic_v3_set_redist_base(struct kvm *kvm, u32 index, u64 addr, u32 count)
+{
+	int ret;
+
+	mutex_lock(&kvm->arch.config_lock);
+	ret = vgic_v3_alloc_redist_region(kvm, index, addr, count);
+	mutex_unlock(&kvm->arch.config_lock);
+	if (ret)
+		return ret;
+
+	/*
+	 * Register iodevs for each existing VCPU.  Adding more VCPUs
+	 * afterwards will register the iodevs when needed.
+	 */
+	ret = vgic_register_all_redist_iodevs(kvm);
+	if (ret) {
+		struct vgic_redist_region *rdreg;
+
+		mutex_lock(&kvm->arch.config_lock);
+		rdreg = vgic_v3_rdist_region_from_index(kvm, index);
+		vgic_v3_free_redist_region(rdreg);
+		mutex_unlock(&kvm->arch.config_lock);
+		return ret;
+	}
+
+	return 0;
+}
+
+int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+	const struct vgic_register_region *region;
+	struct vgic_io_device iodev;
+	struct vgic_reg_attr reg_attr;
+	struct kvm_vcpu *vcpu;
+	gpa_t addr;
+	int ret;
+
+	ret = vgic_v3_parse_attr(dev, attr, &reg_attr);
+	if (ret)
+		return ret;
+
+	vcpu = reg_attr.vcpu;
+	addr = reg_attr.addr;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+		iodev.regions = vgic_v3_dist_registers;
+		iodev.nr_regions = ARRAY_SIZE(vgic_v3_dist_registers);
+		iodev.base_addr = 0;
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:{
+		iodev.regions = vgic_v3_rd_registers;
+		iodev.nr_regions = ARRAY_SIZE(vgic_v3_rd_registers);
+		iodev.base_addr = 0;
+		break;
+	}
+	case KVM_DEV_ARM_VGIC_GRP_CPU_SYSREGS:
+		return vgic_v3_has_cpu_sysregs_attr(vcpu, attr);
+	default:
+		return -ENXIO;
+	}
+
+	/* We only support aligned 32-bit accesses. */
+	if (addr & 3)
+		return -ENXIO;
+
+	region = vgic_get_mmio_region(vcpu, &iodev, addr, sizeof(u32));
+	if (!region)
+		return -ENXIO;
+
+	return 0;
+}
+/*
+ * Compare a given affinity (level 1-3 and a level 0 mask, from the SGI
+ * generation register ICC_SGI1R_EL1) with a given VCPU.
+ * If the VCPU's MPIDR matches, return the level0 affinity, otherwise
+ * return -1.
+ */
+static int match_mpidr(u64 sgi_aff, u16 sgi_cpu_mask, struct kvm_vcpu *vcpu)
+{
+	unsigned long affinity;
+	int level0;
+
+	/*
+	 * Split the current VCPU's MPIDR into affinity level 0 and the
+	 * rest as this is what we have to compare against.
+	 */
+	affinity = kvm_vcpu_get_mpidr_aff(vcpu);
+	level0 = MPIDR_AFFINITY_LEVEL(affinity, 0);
+	affinity &= ~MPIDR_LEVEL_MASK;
+
+	/* bail out if the upper three levels don't match */
+	if (sgi_aff != affinity)
+		return -1;
+
+	/* Is this VCPU's bit set in the mask ? */
+	if (!(sgi_cpu_mask & BIT(level0)))
+		return -1;
+
+	return level0;
+}
+
+/*
+ * The ICC_SGI* registers encode the affinity differently from the MPIDR,
+ * so provide a wrapper to use the existing defines to isolate a certain
+ * affinity level.
+ */
+#define SGI_AFFINITY_LEVEL(reg, level) \
+	((((reg) & ICC_SGI1R_AFFINITY_## level ##_MASK) \
+	>> ICC_SGI1R_AFFINITY_## level ##_SHIFT) << MPIDR_LEVEL_SHIFT(level))
+
+/**
+ * vgic_v3_dispatch_sgi - handle SGI requests from VCPUs
+ * @vcpu: The VCPU requesting a SGI
+ * @reg: The value written into ICC_{ASGI1,SGI0,SGI1}R by that VCPU
+ * @allow_group1: Does the sysreg access allow generation of G1 SGIs
+ *
+ * With GICv3 (and ARE=1) CPUs trigger SGIs by writing to a system register.
+ * This will trap in sys_regs.c and call this function.
+ * This ICC_SGI1R_EL1 register contains the upper three affinity levels of the
+ * target processors as well as a bitmask of 16 Aff0 CPUs.
+ * If the interrupt routing mode bit is not set, we iterate over all VCPUs to
+ * check for matching ones. If this bit is set, we signal all, but not the
+ * calling VCPU.
+ */
+void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg, bool allow_group1)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_vcpu *c_vcpu;
+	u16 target_cpus;
+	u64 mpidr;
+	int sgi;
+	int vcpu_id = vcpu->vcpu_id;
+	bool broadcast;
+	unsigned long c, flags;
+
+	sgi = (reg & ICC_SGI1R_SGI_ID_MASK) >> ICC_SGI1R_SGI_ID_SHIFT;
+	broadcast = reg & BIT_ULL(ICC_SGI1R_IRQ_ROUTING_MODE_BIT);
+	target_cpus = (reg & ICC_SGI1R_TARGET_LIST_MASK) >> ICC_SGI1R_TARGET_LIST_SHIFT;
+	mpidr = SGI_AFFINITY_LEVEL(reg, 3);
+	mpidr |= SGI_AFFINITY_LEVEL(reg, 2);
+	mpidr |= SGI_AFFINITY_LEVEL(reg, 1);
+
+	/*
+	 * We iterate over all VCPUs to find the MPIDRs matching the request.
+	 * If we have handled one CPU, we clear its bit to detect early
+	 * if we are already finished. This avoids iterating through all
+	 * VCPUs when most of the times we just signal a single VCPU.
+	 */
+	kvm_for_each_vcpu(c, c_vcpu, kvm) {
+		struct vgic_irq *irq;
+
+		/* Exit early if we have dealt with all requested CPUs */
+		if (!broadcast && target_cpus == 0)
+			break;
+
+		/* Don't signal the calling VCPU */
+		if (broadcast && c == vcpu_id)
+			continue;
+
+		if (!broadcast) {
+			int level0;
+
+			level0 = match_mpidr(mpidr, target_cpus, c_vcpu);
+			if (level0 == -1)
+				continue;
+
+			/* remove this matching VCPU from the mask */
+			target_cpus &= ~BIT(level0);
+		}
+
+		irq = vgic_get_irq(vcpu->kvm, c_vcpu, sgi);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		/*
+		 * An access targeting Group0 SGIs can only generate
+		 * those, while an access targeting Group1 SGIs can
+		 * generate interrupts of either group.
+		 */
+		if (!irq->group || allow_group1) {
+			if (!irq->hw) {
+				irq->pending_latch = true;
+				vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+			} else {
+				/* HW SGI? Ask the GIC to inject it */
+				int err;
+				err = irq_set_irqchip_state(irq->host_irq,
+							    IRQCHIP_STATE_PENDING,
+							    true);
+				WARN_RATELIMIT(err, "IRQ %d", irq->host_irq);
+				raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+			}
+		} else {
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		}
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+int vgic_v3_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			 int offset, u32 *val)
+{
+	struct vgic_io_device dev = {
+		.regions = vgic_v3_dist_registers,
+		.nr_regions = ARRAY_SIZE(vgic_v3_dist_registers),
+	};
+
+	return vgic_uaccess(vcpu, &dev, is_write, offset, val);
+}
+
+int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			   int offset, u32 *val)
+{
+	struct vgic_io_device rd_dev = {
+		.regions = vgic_v3_rd_registers,
+		.nr_regions = ARRAY_SIZE(vgic_v3_rd_registers),
+	};
+
+	return vgic_uaccess(vcpu, &rd_dev, is_write, offset, val);
+}
+
+int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+				    u32 intid, u32 *val)
+{
+	if (intid % 32)
+		return -EINVAL;
+
+	if (is_write)
+		vgic_write_irq_line_level_info(vcpu, intid, *val);
+	else
+		*val = vgic_read_irq_line_level_info(vcpu, intid);
+
+	return 0;
+}
diff --git a/arch/arm64/kvm/vgic/vgic-mmio.c b/arch/arm64/kvm/vgic/vgic-mmio.c
new file mode 100644
index 000000000..eb5c58d78
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-mmio.c
@@ -0,0 +1,1115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VGIC MMIO handling functions
+ */
+
+#include <linux/bitops.h>
+#include <linux/bsearch.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <kvm/iodev.h>
+#include <kvm/arm_arch_timer.h>
+#include <kvm/arm_vgic.h>
+
+#include "vgic.h"
+#include "vgic-mmio.h"
+
+unsigned long vgic_mmio_read_raz(struct kvm_vcpu *vcpu,
+				 gpa_t addr, unsigned int len)
+{
+	return 0;
+}
+
+unsigned long vgic_mmio_read_rao(struct kvm_vcpu *vcpu,
+				 gpa_t addr, unsigned int len)
+{
+	return -1UL;
+}
+
+void vgic_mmio_write_wi(struct kvm_vcpu *vcpu, gpa_t addr,
+			unsigned int len, unsigned long val)
+{
+	/* Ignore */
+}
+
+int vgic_mmio_uaccess_write_wi(struct kvm_vcpu *vcpu, gpa_t addr,
+			       unsigned int len, unsigned long val)
+{
+	/* Ignore */
+	return 0;
+}
+
+unsigned long vgic_mmio_read_group(struct kvm_vcpu *vcpu,
+				   gpa_t addr, unsigned int len)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	u32 value = 0;
+	int i;
+
+	/* Loop over all IRQs affected by this read */
+	for (i = 0; i < len * 8; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		if (irq->group)
+			value |= BIT(i);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return value;
+}
+
+static void vgic_update_vsgi(struct vgic_irq *irq)
+{
+	WARN_ON(its_prop_update_vsgi(irq->host_irq, irq->priority, irq->group));
+}
+
+void vgic_mmio_write_group(struct kvm_vcpu *vcpu, gpa_t addr,
+			   unsigned int len, unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for (i = 0; i < len * 8; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		irq->group = !!(val & BIT(i));
+		if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+			vgic_update_vsgi(irq);
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		} else {
+			vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+		}
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+/*
+ * Read accesses to both GICD_ICENABLER and GICD_ISENABLER return the value
+ * of the enabled bit, so there is only one function for both here.
+ */
+unsigned long vgic_mmio_read_enable(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	u32 value = 0;
+	int i;
+
+	/* Loop over all IRQs affected by this read */
+	for (i = 0; i < len * 8; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		if (irq->enabled)
+			value |= (1U << i);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return value;
+}
+
+void vgic_mmio_write_senable(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+			if (!irq->enabled) {
+				struct irq_data *data;
+
+				irq->enabled = true;
+				data = &irq_to_desc(irq->host_irq)->irq_data;
+				while (irqd_irq_disabled(data))
+					enable_irq(irq->host_irq);
+			}
+
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+			vgic_put_irq(vcpu->kvm, irq);
+
+			continue;
+		} else if (vgic_irq_is_mapped_level(irq)) {
+			bool was_high = irq->line_level;
+
+			/*
+			 * We need to update the state of the interrupt because
+			 * the guest might have changed the state of the device
+			 * while the interrupt was disabled at the VGIC level.
+			 */
+			irq->line_level = vgic_get_phys_line_level(irq);
+			/*
+			 * Deactivate the physical interrupt so the GIC will let
+			 * us know when it is asserted again.
+			 */
+			if (!irq->active && was_high && !irq->line_level)
+				vgic_irq_set_phys_active(irq, false);
+		}
+		irq->enabled = true;
+		vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+void vgic_mmio_write_cenable(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		if (irq->hw && vgic_irq_is_sgi(irq->intid) && irq->enabled)
+			disable_irq_nosync(irq->host_irq);
+
+		irq->enabled = false;
+
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+int vgic_uaccess_write_senable(struct kvm_vcpu *vcpu,
+			       gpa_t addr, unsigned int len,
+			       unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		irq->enabled = true;
+		vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return 0;
+}
+
+int vgic_uaccess_write_cenable(struct kvm_vcpu *vcpu,
+			       gpa_t addr, unsigned int len,
+			       unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		irq->enabled = false;
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return 0;
+}
+
+static unsigned long __read_pending(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len,
+				    bool is_user)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	u32 value = 0;
+	int i;
+
+	/* Loop over all IRQs affected by this read */
+	for (i = 0; i < len * 8; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+		unsigned long flags;
+		bool val;
+
+		/*
+		 * When used from userspace with a GICv3 model:
+		 *
+		 * Pending state of interrupt is latched in pending_latch
+		 * variable.  Userspace will save and restore pending state
+		 * and line_level separately.
+		 * Refer to Documentation/virt/kvm/devices/arm-vgic-v3.rst
+		 * for handling of ISPENDR and ICPENDR.
+		 */
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+			int err;
+
+			val = false;
+			err = irq_get_irqchip_state(irq->host_irq,
+						    IRQCHIP_STATE_PENDING,
+						    &val);
+			WARN_RATELIMIT(err, "IRQ %d", irq->host_irq);
+		} else if (!is_user && vgic_irq_is_mapped_level(irq)) {
+			val = vgic_get_phys_line_level(irq);
+		} else {
+			switch (vcpu->kvm->arch.vgic.vgic_model) {
+			case KVM_DEV_TYPE_ARM_VGIC_V3:
+				if (is_user) {
+					val = irq->pending_latch;
+					break;
+				}
+				fallthrough;
+			default:
+				val = irq_is_pending(irq);
+				break;
+			}
+		}
+
+		value |= ((u32)val << i);
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return value;
+}
+
+unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len)
+{
+	return __read_pending(vcpu, addr, len, false);
+}
+
+unsigned long vgic_uaccess_read_pending(struct kvm_vcpu *vcpu,
+					gpa_t addr, unsigned int len)
+{
+	return __read_pending(vcpu, addr, len, true);
+}
+
+static bool is_vgic_v2_sgi(struct kvm_vcpu *vcpu, struct vgic_irq *irq)
+{
+	return (vgic_irq_is_sgi(irq->intid) &&
+		vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2);
+}
+
+void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
+			      gpa_t addr, unsigned int len,
+			      unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		/* GICD_ISPENDR0 SGI bits are WI */
+		if (is_vgic_v2_sgi(vcpu, irq)) {
+			vgic_put_irq(vcpu->kvm, irq);
+			continue;
+		}
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+			/* HW SGI? Ask the GIC to inject it */
+			int err;
+			err = irq_set_irqchip_state(irq->host_irq,
+						    IRQCHIP_STATE_PENDING,
+						    true);
+			WARN_RATELIMIT(err, "IRQ %d", irq->host_irq);
+
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+			vgic_put_irq(vcpu->kvm, irq);
+
+			continue;
+		}
+
+		irq->pending_latch = true;
+		if (irq->hw)
+			vgic_irq_set_phys_active(irq, true);
+
+		vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+int vgic_uaccess_write_spending(struct kvm_vcpu *vcpu,
+				gpa_t addr, unsigned int len,
+				unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		irq->pending_latch = true;
+
+		/*
+		 * GICv2 SGIs are terribly broken. We can't restore
+		 * the source of the interrupt, so just pick the vcpu
+		 * itself as the source...
+		 */
+		if (is_vgic_v2_sgi(vcpu, irq))
+			irq->source |= BIT(vcpu->vcpu_id);
+
+		vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return 0;
+}
+
+/* Must be called with irq->irq_lock held */
+static void vgic_hw_irq_cpending(struct kvm_vcpu *vcpu, struct vgic_irq *irq)
+{
+	irq->pending_latch = false;
+
+	/*
+	 * We don't want the guest to effectively mask the physical
+	 * interrupt by doing a write to SPENDR followed by a write to
+	 * CPENDR for HW interrupts, so we clear the active state on
+	 * the physical side if the virtual interrupt is not active.
+	 * This may lead to taking an additional interrupt on the
+	 * host, but that should not be a problem as the worst that
+	 * can happen is an additional vgic injection.  We also clear
+	 * the pending state to maintain proper semantics for edge HW
+	 * interrupts.
+	 */
+	vgic_irq_set_phys_pending(irq, false);
+	if (!irq->active)
+		vgic_irq_set_phys_active(irq, false);
+}
+
+void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
+			      gpa_t addr, unsigned int len,
+			      unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		/* GICD_ICPENDR0 SGI bits are WI */
+		if (is_vgic_v2_sgi(vcpu, irq)) {
+			vgic_put_irq(vcpu->kvm, irq);
+			continue;
+		}
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+			/* HW SGI? Ask the GIC to clear its pending bit */
+			int err;
+			err = irq_set_irqchip_state(irq->host_irq,
+						    IRQCHIP_STATE_PENDING,
+						    false);
+			WARN_RATELIMIT(err, "IRQ %d", irq->host_irq);
+
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+			vgic_put_irq(vcpu->kvm, irq);
+
+			continue;
+		}
+
+		if (irq->hw)
+			vgic_hw_irq_cpending(vcpu, irq);
+		else
+			irq->pending_latch = false;
+
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+int vgic_uaccess_write_cpending(struct kvm_vcpu *vcpu,
+				gpa_t addr, unsigned int len,
+				unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+	unsigned long flags;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		/*
+		 * More fun with GICv2 SGIs! If we're clearing one of them
+		 * from userspace, which source vcpu to clear? Let's not
+		 * even think of it, and blow the whole set.
+		 */
+		if (is_vgic_v2_sgi(vcpu, irq))
+			irq->source = 0;
+
+		irq->pending_latch = false;
+
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return 0;
+}
+
+/*
+ * If we are fiddling with an IRQ's active state, we have to make sure the IRQ
+ * is not queued on some running VCPU's LRs, because then the change to the
+ * active state can be overwritten when the VCPU's state is synced coming back
+ * from the guest.
+ *
+ * For shared interrupts as well as GICv3 private interrupts, we have to
+ * stop all the VCPUs because interrupts can be migrated while we don't hold
+ * the IRQ locks and we don't want to be chasing moving targets.
+ *
+ * For GICv2 private interrupts we don't have to do anything because
+ * userspace accesses to the VGIC state already require all VCPUs to be
+ * stopped, and only the VCPU itself can modify its private interrupts
+ * active state, which guarantees that the VCPU is not running.
+ */
+static void vgic_access_active_prepare(struct kvm_vcpu *vcpu, u32 intid)
+{
+	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3 ||
+	    intid >= VGIC_NR_PRIVATE_IRQS)
+		kvm_arm_halt_guest(vcpu->kvm);
+}
+
+/* See vgic_access_active_prepare */
+static void vgic_access_active_finish(struct kvm_vcpu *vcpu, u32 intid)
+{
+	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3 ||
+	    intid >= VGIC_NR_PRIVATE_IRQS)
+		kvm_arm_resume_guest(vcpu->kvm);
+}
+
+static unsigned long __vgic_mmio_read_active(struct kvm_vcpu *vcpu,
+					     gpa_t addr, unsigned int len)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	u32 value = 0;
+	int i;
+
+	/* Loop over all IRQs affected by this read */
+	for (i = 0; i < len * 8; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		/*
+		 * Even for HW interrupts, don't evaluate the HW state as
+		 * all the guest is interested in is the virtual state.
+		 */
+		if (irq->active)
+			value |= (1U << i);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return value;
+}
+
+unsigned long vgic_mmio_read_active(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	u32 val;
+
+	mutex_lock(&vcpu->kvm->arch.config_lock);
+	vgic_access_active_prepare(vcpu, intid);
+
+	val = __vgic_mmio_read_active(vcpu, addr, len);
+
+	vgic_access_active_finish(vcpu, intid);
+	mutex_unlock(&vcpu->kvm->arch.config_lock);
+
+	return val;
+}
+
+unsigned long vgic_uaccess_read_active(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len)
+{
+	return __vgic_mmio_read_active(vcpu, addr, len);
+}
+
+/* Must be called with irq->irq_lock held */
+static void vgic_hw_irq_change_active(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
+				      bool active, bool is_uaccess)
+{
+	if (is_uaccess)
+		return;
+
+	irq->active = active;
+	vgic_irq_set_phys_active(irq, active);
+}
+
+static void vgic_mmio_change_active(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
+				    bool active)
+{
+	unsigned long flags;
+	struct kvm_vcpu *requester_vcpu = kvm_get_running_vcpu();
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+	if (irq->hw && !vgic_irq_is_sgi(irq->intid)) {
+		vgic_hw_irq_change_active(vcpu, irq, active, !requester_vcpu);
+	} else if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
+		/*
+		 * GICv4.1 VSGI feature doesn't track an active state,
+		 * so let's not kid ourselves, there is nothing we can
+		 * do here.
+		 */
+		irq->active = false;
+	} else {
+		u32 model = vcpu->kvm->arch.vgic.vgic_model;
+		u8 active_source;
+
+		irq->active = active;
+
+		/*
+		 * The GICv2 architecture indicates that the source CPUID for
+		 * an SGI should be provided during an EOI which implies that
+		 * the active state is stored somewhere, but at the same time
+		 * this state is not architecturally exposed anywhere and we
+		 * have no way of knowing the right source.
+		 *
+		 * This may lead to a VCPU not being able to receive
+		 * additional instances of a particular SGI after migration
+		 * for a GICv2 VM on some GIC implementations.  Oh well.
+		 */
+		active_source = (requester_vcpu) ? requester_vcpu->vcpu_id : 0;
+
+		if (model == KVM_DEV_TYPE_ARM_VGIC_V2 &&
+		    active && vgic_irq_is_sgi(irq->intid))
+			irq->active_source = active_source;
+	}
+
+	if (irq->active)
+		vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+	else
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+}
+
+static void __vgic_mmio_write_cactive(struct kvm_vcpu *vcpu,
+				      gpa_t addr, unsigned int len,
+				      unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+		vgic_mmio_change_active(vcpu, irq, false);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+void vgic_mmio_write_cactive(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+
+	mutex_lock(&vcpu->kvm->arch.config_lock);
+	vgic_access_active_prepare(vcpu, intid);
+
+	__vgic_mmio_write_cactive(vcpu, addr, len, val);
+
+	vgic_access_active_finish(vcpu, intid);
+	mutex_unlock(&vcpu->kvm->arch.config_lock);
+}
+
+int vgic_mmio_uaccess_write_cactive(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	__vgic_mmio_write_cactive(vcpu, addr, len, val);
+	return 0;
+}
+
+static void __vgic_mmio_write_sactive(struct kvm_vcpu *vcpu,
+				      gpa_t addr, unsigned int len,
+				      unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+	int i;
+
+	for_each_set_bit(i, &val, len * 8) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+		vgic_mmio_change_active(vcpu, irq, true);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
+
+	mutex_lock(&vcpu->kvm->arch.config_lock);
+	vgic_access_active_prepare(vcpu, intid);
+
+	__vgic_mmio_write_sactive(vcpu, addr, len, val);
+
+	vgic_access_active_finish(vcpu, intid);
+	mutex_unlock(&vcpu->kvm->arch.config_lock);
+}
+
+int vgic_mmio_uaccess_write_sactive(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len,
+				     unsigned long val)
+{
+	__vgic_mmio_write_sactive(vcpu, addr, len, val);
+	return 0;
+}
+
+unsigned long vgic_mmio_read_priority(struct kvm_vcpu *vcpu,
+				      gpa_t addr, unsigned int len)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
+	int i;
+	u64 val = 0;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		val |= (u64)irq->priority << (i * 8);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return val;
+}
+
+/*
+ * We currently don't handle changing the priority of an interrupt that
+ * is already pending on a VCPU. If there is a need for this, we would
+ * need to make this VCPU exit and re-evaluate the priorities, potentially
+ * leading to this interrupt getting presented now to the guest (if it has
+ * been masked by the priority mask before).
+ */
+void vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
+			      gpa_t addr, unsigned int len,
+			      unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
+	int i;
+	unsigned long flags;
+
+	for (i = 0; i < len; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		/* Narrow the priority range to what we actually support */
+		irq->priority = (val >> (i * 8)) & GENMASK(7, 8 - VGIC_PRI_BITS);
+		if (irq->hw && vgic_irq_is_sgi(irq->intid))
+			vgic_update_vsgi(irq);
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+unsigned long vgic_mmio_read_config(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 2);
+	u32 value = 0;
+	int i;
+
+	for (i = 0; i < len * 4; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		if (irq->config == VGIC_CONFIG_EDGE)
+			value |= (2U << (i * 2));
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return value;
+}
+
+void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
+			    gpa_t addr, unsigned int len,
+			    unsigned long val)
+{
+	u32 intid = VGIC_ADDR_TO_INTID(addr, 2);
+	int i;
+	unsigned long flags;
+
+	for (i = 0; i < len * 4; i++) {
+		struct vgic_irq *irq;
+
+		/*
+		 * The configuration cannot be changed for SGIs in general,
+		 * for PPIs this is IMPLEMENTATION DEFINED. The arch timer
+		 * code relies on PPIs being level triggered, so we also
+		 * make them read-only here.
+		 */
+		if (intid + i < VGIC_NR_PRIVATE_IRQS)
+			continue;
+
+		irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		if (test_bit(i * 2 + 1, &val))
+			irq->config = VGIC_CONFIG_EDGE;
+		else
+			irq->config = VGIC_CONFIG_LEVEL;
+
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+u32 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid)
+{
+	int i;
+	u32 val = 0;
+	int nr_irqs = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
+
+	for (i = 0; i < 32; i++) {
+		struct vgic_irq *irq;
+
+		if ((intid + i) < VGIC_NR_SGIS || (intid + i) >= nr_irqs)
+			continue;
+
+		irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+		if (irq->config == VGIC_CONFIG_LEVEL && irq->line_level)
+			val |= (1U << i);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	return val;
+}
+
+void vgic_write_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid,
+				    const u32 val)
+{
+	int i;
+	int nr_irqs = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
+	unsigned long flags;
+
+	for (i = 0; i < 32; i++) {
+		struct vgic_irq *irq;
+		bool new_level;
+
+		if ((intid + i) < VGIC_NR_SGIS || (intid + i) >= nr_irqs)
+			continue;
+
+		irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+		/*
+		 * Line level is set irrespective of irq type
+		 * (level or edge) to avoid dependency that VM should
+		 * restore irq config before line level.
+		 */
+		new_level = !!(val & (1U << i));
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		irq->line_level = new_level;
+		if (new_level)
+			vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+		else
+			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+static int match_region(const void *key, const void *elt)
+{
+	const unsigned int offset = (unsigned long)key;
+	const struct vgic_register_region *region = elt;
+
+	if (offset < region->reg_offset)
+		return -1;
+
+	if (offset >= region->reg_offset + region->len)
+		return 1;
+
+	return 0;
+}
+
+const struct vgic_register_region *
+vgic_find_mmio_region(const struct vgic_register_region *regions,
+		      int nr_regions, unsigned int offset)
+{
+	return bsearch((void *)(uintptr_t)offset, regions, nr_regions,
+		       sizeof(regions[0]), match_region);
+}
+
+void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_set_vmcr(vcpu, vmcr);
+	else
+		vgic_v3_set_vmcr(vcpu, vmcr);
+}
+
+void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_get_vmcr(vcpu, vmcr);
+	else
+		vgic_v3_get_vmcr(vcpu, vmcr);
+}
+
+/*
+ * kvm_mmio_read_buf() returns a value in a format where it can be converted
+ * to a byte array and be directly observed as the guest wanted it to appear
+ * in memory if it had done the store itself, which is LE for the GIC, as the
+ * guest knows the GIC is always LE.
+ *
+ * We convert this value to the CPUs native format to deal with it as a data
+ * value.
+ */
+unsigned long vgic_data_mmio_bus_to_host(const void *val, unsigned int len)
+{
+	unsigned long data = kvm_mmio_read_buf(val, len);
+
+	switch (len) {
+	case 1:
+		return data;
+	case 2:
+		return le16_to_cpu(data);
+	case 4:
+		return le32_to_cpu(data);
+	default:
+		return le64_to_cpu(data);
+	}
+}
+
+/*
+ * kvm_mmio_write_buf() expects a value in a format such that if converted to
+ * a byte array it is observed as the guest would see it if it could perform
+ * the load directly.  Since the GIC is LE, and the guest knows this, the
+ * guest expects a value in little endian format.
+ *
+ * We convert the data value from the CPUs native format to LE so that the
+ * value is returned in the proper format.
+ */
+void vgic_data_host_to_mmio_bus(void *buf, unsigned int len,
+				unsigned long data)
+{
+	switch (len) {
+	case 1:
+		break;
+	case 2:
+		data = cpu_to_le16(data);
+		break;
+	case 4:
+		data = cpu_to_le32(data);
+		break;
+	default:
+		data = cpu_to_le64(data);
+	}
+
+	kvm_mmio_write_buf(buf, len, data);
+}
+
+static
+struct vgic_io_device *kvm_to_vgic_iodev(const struct kvm_io_device *dev)
+{
+	return container_of(dev, struct vgic_io_device, dev);
+}
+
+static bool check_region(const struct kvm *kvm,
+			 const struct vgic_register_region *region,
+			 gpa_t addr, int len)
+{
+	int flags, nr_irqs = kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
+
+	switch (len) {
+	case sizeof(u8):
+		flags = VGIC_ACCESS_8bit;
+		break;
+	case sizeof(u32):
+		flags = VGIC_ACCESS_32bit;
+		break;
+	case sizeof(u64):
+		flags = VGIC_ACCESS_64bit;
+		break;
+	default:
+		return false;
+	}
+
+	if ((region->access_flags & flags) && IS_ALIGNED(addr, len)) {
+		if (!region->bits_per_irq)
+			return true;
+
+		/* Do we access a non-allocated IRQ? */
+		return VGIC_ADDR_TO_INTID(addr, region->bits_per_irq) < nr_irqs;
+	}
+
+	return false;
+}
+
+const struct vgic_register_region *
+vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
+		     gpa_t addr, int len)
+{
+	const struct vgic_register_region *region;
+
+	region = vgic_find_mmio_region(iodev->regions, iodev->nr_regions,
+				       addr - iodev->base_addr);
+	if (!region || !check_region(vcpu->kvm, region, addr, len))
+		return NULL;
+
+	return region;
+}
+
+static int vgic_uaccess_read(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
+			     gpa_t addr, u32 *val)
+{
+	const struct vgic_register_region *region;
+	struct kvm_vcpu *r_vcpu;
+
+	region = vgic_get_mmio_region(vcpu, iodev, addr, sizeof(u32));
+	if (!region) {
+		*val = 0;
+		return 0;
+	}
+
+	r_vcpu = iodev->redist_vcpu ? iodev->redist_vcpu : vcpu;
+	if (region->uaccess_read)
+		*val = region->uaccess_read(r_vcpu, addr, sizeof(u32));
+	else
+		*val = region->read(r_vcpu, addr, sizeof(u32));
+
+	return 0;
+}
+
+static int vgic_uaccess_write(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
+			      gpa_t addr, const u32 *val)
+{
+	const struct vgic_register_region *region;
+	struct kvm_vcpu *r_vcpu;
+
+	region = vgic_get_mmio_region(vcpu, iodev, addr, sizeof(u32));
+	if (!region)
+		return 0;
+
+	r_vcpu = iodev->redist_vcpu ? iodev->redist_vcpu : vcpu;
+	if (region->uaccess_write)
+		return region->uaccess_write(r_vcpu, addr, sizeof(u32), *val);
+
+	region->write(r_vcpu, addr, sizeof(u32), *val);
+	return 0;
+}
+
+/*
+ * Userland access to VGIC registers.
+ */
+int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev,
+		 bool is_write, int offset, u32 *val)
+{
+	if (is_write)
+		return vgic_uaccess_write(vcpu, dev, offset, val);
+	else
+		return vgic_uaccess_read(vcpu, dev, offset, val);
+}
+
+static int dispatch_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
+			      gpa_t addr, int len, void *val)
+{
+	struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
+	const struct vgic_register_region *region;
+	unsigned long data = 0;
+
+	region = vgic_get_mmio_region(vcpu, iodev, addr, len);
+	if (!region) {
+		memset(val, 0, len);
+		return 0;
+	}
+
+	switch (iodev->iodev_type) {
+	case IODEV_CPUIF:
+		data = region->read(vcpu, addr, len);
+		break;
+	case IODEV_DIST:
+		data = region->read(vcpu, addr, len);
+		break;
+	case IODEV_REDIST:
+		data = region->read(iodev->redist_vcpu, addr, len);
+		break;
+	case IODEV_ITS:
+		data = region->its_read(vcpu->kvm, iodev->its, addr, len);
+		break;
+	}
+
+	vgic_data_host_to_mmio_bus(val, len, data);
+	return 0;
+}
+
+static int dispatch_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
+			       gpa_t addr, int len, const void *val)
+{
+	struct vgic_io_device *iodev = kvm_to_vgic_iodev(dev);
+	const struct vgic_register_region *region;
+	unsigned long data = vgic_data_mmio_bus_to_host(val, len);
+
+	region = vgic_get_mmio_region(vcpu, iodev, addr, len);
+	if (!region)
+		return 0;
+
+	switch (iodev->iodev_type) {
+	case IODEV_CPUIF:
+		region->write(vcpu, addr, len, data);
+		break;
+	case IODEV_DIST:
+		region->write(vcpu, addr, len, data);
+		break;
+	case IODEV_REDIST:
+		region->write(iodev->redist_vcpu, addr, len, data);
+		break;
+	case IODEV_ITS:
+		region->its_write(vcpu->kvm, iodev->its, addr, len, data);
+		break;
+	}
+
+	return 0;
+}
+
+const struct kvm_io_device_ops kvm_io_gic_ops = {
+	.read = dispatch_mmio_read,
+	.write = dispatch_mmio_write,
+};
+
+int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
+			     enum vgic_type type)
+{
+	struct vgic_io_device *io_device = &kvm->arch.vgic.dist_iodev;
+	unsigned int len;
+
+	switch (type) {
+	case VGIC_V2:
+		len = vgic_v2_init_dist_iodev(io_device);
+		break;
+	case VGIC_V3:
+		len = vgic_v3_init_dist_iodev(io_device);
+		break;
+	default:
+		BUG_ON(1);
+	}
+
+	io_device->base_addr = dist_base_address;
+	io_device->iodev_type = IODEV_DIST;
+	io_device->redist_vcpu = NULL;
+
+	return kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, dist_base_address,
+				       len, &io_device->dev);
+}
diff --git a/arch/arm64/kvm/vgic/vgic-mmio.h b/arch/arm64/kvm/vgic/vgic-mmio.h
new file mode 100644
index 000000000..5b490a4df
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-mmio.h
@@ -0,0 +1,230 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015, 2016 ARM Ltd.
+ */
+#ifndef __KVM_ARM_VGIC_MMIO_H__
+#define __KVM_ARM_VGIC_MMIO_H__
+
+struct vgic_register_region {
+	unsigned int reg_offset;
+	unsigned int len;
+	unsigned int bits_per_irq;
+	unsigned int access_flags;
+	union {
+		unsigned long (*read)(struct kvm_vcpu *vcpu, gpa_t addr,
+				      unsigned int len);
+		unsigned long (*its_read)(struct kvm *kvm, struct vgic_its *its,
+					  gpa_t addr, unsigned int len);
+	};
+	union {
+		void (*write)(struct kvm_vcpu *vcpu, gpa_t addr,
+			      unsigned int len, unsigned long val);
+		void (*its_write)(struct kvm *kvm, struct vgic_its *its,
+				  gpa_t addr, unsigned int len,
+				  unsigned long val);
+	};
+	unsigned long (*uaccess_read)(struct kvm_vcpu *vcpu, gpa_t addr,
+				      unsigned int len);
+	union {
+		int (*uaccess_write)(struct kvm_vcpu *vcpu, gpa_t addr,
+				     unsigned int len, unsigned long val);
+		int (*uaccess_its_write)(struct kvm *kvm, struct vgic_its *its,
+					 gpa_t addr, unsigned int len,
+					 unsigned long val);
+	};
+};
+
+extern const struct kvm_io_device_ops kvm_io_gic_ops;
+
+#define VGIC_ACCESS_8bit	1
+#define VGIC_ACCESS_32bit	2
+#define VGIC_ACCESS_64bit	4
+
+/*
+ * Generate a mask that covers the number of bytes required to address
+ * up to 1024 interrupts, each represented by <bits> bits. This assumes
+ * that <bits> is a power of two.
+ */
+#define VGIC_ADDR_IRQ_MASK(bits) (((bits) * 1024 / 8) - 1)
+
+/*
+ * (addr & mask) gives us the _byte_ offset for the INT ID.
+ * We multiply this by 8 the get the _bit_ offset, then divide this by
+ * the number of bits to learn the actual INT ID.
+ * But instead of a division (which requires a "long long div" implementation),
+ * we shift by the binary logarithm of <bits>.
+ * This assumes that <bits> is a power of two.
+ */
+#define VGIC_ADDR_TO_INTID(addr, bits)  (((addr) & VGIC_ADDR_IRQ_MASK(bits)) * \
+					8 >> ilog2(bits))
+
+/*
+ * Some VGIC registers store per-IRQ information, with a different number
+ * of bits per IRQ. For those registers this macro is used.
+ * The _WITH_LENGTH version instantiates registers with a fixed length
+ * and is mutually exclusive with the _PER_IRQ version.
+ */
+#define REGISTER_DESC_WITH_BITS_PER_IRQ(off, rd, wr, ur, uw, bpi, acc)	\
+	{								\
+		.reg_offset = off,					\
+		.bits_per_irq = bpi,					\
+		.len = bpi * 1024 / 8,					\
+		.access_flags = acc,					\
+		.read = rd,						\
+		.write = wr,						\
+		.uaccess_read = ur,					\
+		.uaccess_write = uw,					\
+	}
+
+#define REGISTER_DESC_WITH_LENGTH(off, rd, wr, length, acc)		\
+	{								\
+		.reg_offset = off,					\
+		.bits_per_irq = 0,					\
+		.len = length,						\
+		.access_flags = acc,					\
+		.read = rd,						\
+		.write = wr,						\
+	}
+
+#define REGISTER_DESC_WITH_LENGTH_UACCESS(off, rd, wr, urd, uwr, length, acc) \
+	{								\
+		.reg_offset = off,					\
+		.bits_per_irq = 0,					\
+		.len = length,						\
+		.access_flags = acc,					\
+		.read = rd,						\
+		.write = wr,						\
+		.uaccess_read = urd,					\
+		.uaccess_write = uwr,					\
+	}
+
+unsigned long vgic_data_mmio_bus_to_host(const void *val, unsigned int len);
+
+void vgic_data_host_to_mmio_bus(void *buf, unsigned int len,
+				unsigned long data);
+
+unsigned long extract_bytes(u64 data, unsigned int offset,
+			    unsigned int num);
+
+u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
+		     unsigned long val);
+
+unsigned long vgic_mmio_read_raz(struct kvm_vcpu *vcpu,
+				 gpa_t addr, unsigned int len);
+
+unsigned long vgic_mmio_read_rao(struct kvm_vcpu *vcpu,
+				 gpa_t addr, unsigned int len);
+
+void vgic_mmio_write_wi(struct kvm_vcpu *vcpu, gpa_t addr,
+			unsigned int len, unsigned long val);
+
+int vgic_mmio_uaccess_write_wi(struct kvm_vcpu *vcpu, gpa_t addr,
+			       unsigned int len, unsigned long val);
+
+unsigned long vgic_mmio_read_group(struct kvm_vcpu *vcpu, gpa_t addr,
+				   unsigned int len);
+
+void vgic_mmio_write_group(struct kvm_vcpu *vcpu, gpa_t addr,
+			   unsigned int len, unsigned long val);
+
+unsigned long vgic_mmio_read_enable(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len);
+
+void vgic_mmio_write_senable(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val);
+
+void vgic_mmio_write_cenable(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val);
+
+int vgic_uaccess_write_senable(struct kvm_vcpu *vcpu,
+			       gpa_t addr, unsigned int len,
+			       unsigned long val);
+
+int vgic_uaccess_write_cenable(struct kvm_vcpu *vcpu,
+			       gpa_t addr, unsigned int len,
+			       unsigned long val);
+
+unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu,
+				     gpa_t addr, unsigned int len);
+
+unsigned long vgic_uaccess_read_pending(struct kvm_vcpu *vcpu,
+					gpa_t addr, unsigned int len);
+
+void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
+			      gpa_t addr, unsigned int len,
+			      unsigned long val);
+
+void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
+			      gpa_t addr, unsigned int len,
+			      unsigned long val);
+
+int vgic_uaccess_write_spending(struct kvm_vcpu *vcpu,
+				gpa_t addr, unsigned int len,
+				unsigned long val);
+
+int vgic_uaccess_write_cpending(struct kvm_vcpu *vcpu,
+				gpa_t addr, unsigned int len,
+				unsigned long val);
+
+unsigned long vgic_mmio_read_active(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len);
+
+unsigned long vgic_uaccess_read_active(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len);
+
+void vgic_mmio_write_cactive(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val);
+
+void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu,
+			     gpa_t addr, unsigned int len,
+			     unsigned long val);
+
+int vgic_mmio_uaccess_write_cactive(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len,
+				    unsigned long val);
+
+int vgic_mmio_uaccess_write_sactive(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len,
+				    unsigned long val);
+
+unsigned long vgic_mmio_read_priority(struct kvm_vcpu *vcpu,
+				      gpa_t addr, unsigned int len);
+
+void vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
+			      gpa_t addr, unsigned int len,
+			      unsigned long val);
+
+unsigned long vgic_mmio_read_config(struct kvm_vcpu *vcpu,
+				    gpa_t addr, unsigned int len);
+
+void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
+			    gpa_t addr, unsigned int len,
+			    unsigned long val);
+
+int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev,
+		 bool is_write, int offset, u32 *val);
+
+u32 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid);
+
+void vgic_write_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid,
+				    const u32 val);
+
+unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev);
+
+unsigned int vgic_v3_init_dist_iodev(struct vgic_io_device *dev);
+
+u64 vgic_sanitise_outer_cacheability(u64 reg);
+u64 vgic_sanitise_inner_cacheability(u64 reg);
+u64 vgic_sanitise_shareability(u64 reg);
+u64 vgic_sanitise_field(u64 reg, u64 field_mask, int field_shift,
+			u64 (*sanitise_fn)(u64));
+
+/* Find the proper register handler entry given a certain address offset */
+const struct vgic_register_region *
+vgic_find_mmio_region(const struct vgic_register_region *regions,
+		      int nr_regions, unsigned int offset);
+
+#endif
diff --git a/arch/arm64/kvm/vgic/vgic-v2.c b/arch/arm64/kvm/vgic/vgic-v2.c
new file mode 100644
index 000000000..7e9cdb78f
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-v2.c
@@ -0,0 +1,480 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015, 2016 ARM Ltd.
+ */
+
+#include <linux/irqchip/arm-gic.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <kvm/arm_vgic.h>
+#include <asm/kvm_mmu.h>
+
+#include "vgic.h"
+
+static inline void vgic_v2_write_lr(int lr, u32 val)
+{
+	void __iomem *base = kvm_vgic_global_state.vctrl_base;
+
+	writel_relaxed(val, base + GICH_LR0 + (lr * 4));
+}
+
+void vgic_v2_init_lrs(void)
+{
+	int i;
+
+	for (i = 0; i < kvm_vgic_global_state.nr_lr; i++)
+		vgic_v2_write_lr(i, 0);
+}
+
+void vgic_v2_set_underflow(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;
+
+	cpuif->vgic_hcr |= GICH_HCR_UIE;
+}
+
+static bool lr_signals_eoi_mi(u32 lr_val)
+{
+	return !(lr_val & GICH_LR_STATE) && (lr_val & GICH_LR_EOI) &&
+	       !(lr_val & GICH_LR_HW);
+}
+
+/*
+ * transfer the content of the LRs back into the corresponding ap_list:
+ * - active bit is transferred as is
+ * - pending bit is
+ *   - transferred as is in case of edge sensitive IRQs
+ *   - set to the line-level (resample time) for level sensitive IRQs
+ */
+void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_v2_cpu_if *cpuif = &vgic_cpu->vgic_v2;
+	int lr;
+
+	DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
+
+	cpuif->vgic_hcr &= ~GICH_HCR_UIE;
+
+	for (lr = 0; lr < vgic_cpu->vgic_v2.used_lrs; lr++) {
+		u32 val = cpuif->vgic_lr[lr];
+		u32 cpuid, intid = val & GICH_LR_VIRTUALID;
+		struct vgic_irq *irq;
+		bool deactivated;
+
+		/* Extract the source vCPU id from the LR */
+		cpuid = val & GICH_LR_PHYSID_CPUID;
+		cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
+		cpuid &= 7;
+
+		/* Notify fds when the guest EOI'ed a level-triggered SPI */
+		if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid))
+			kvm_notify_acked_irq(vcpu->kvm, 0,
+					     intid - VGIC_NR_PRIVATE_IRQS);
+
+		irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
+
+		raw_spin_lock(&irq->irq_lock);
+
+		/* Always preserve the active bit, note deactivation */
+		deactivated = irq->active && !(val & GICH_LR_ACTIVE_BIT);
+		irq->active = !!(val & GICH_LR_ACTIVE_BIT);
+
+		if (irq->active && vgic_irq_is_sgi(intid))
+			irq->active_source = cpuid;
+
+		/* Edge is the only case where we preserve the pending bit */
+		if (irq->config == VGIC_CONFIG_EDGE &&
+		    (val & GICH_LR_PENDING_BIT)) {
+			irq->pending_latch = true;
+
+			if (vgic_irq_is_sgi(intid))
+				irq->source |= (1 << cpuid);
+		}
+
+		/*
+		 * Clear soft pending state when level irqs have been acked.
+		 */
+		if (irq->config == VGIC_CONFIG_LEVEL && !(val & GICH_LR_STATE))
+			irq->pending_latch = false;
+
+		/* Handle resampling for mapped interrupts if required */
+		vgic_irq_handle_resampling(irq, deactivated, val & GICH_LR_PENDING_BIT);
+
+		raw_spin_unlock(&irq->irq_lock);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	cpuif->used_lrs = 0;
+}
+
+/*
+ * Populates the particular LR with the state of a given IRQ:
+ * - for an edge sensitive IRQ the pending state is cleared in struct vgic_irq
+ * - for a level sensitive IRQ the pending state value is unchanged;
+ *   it is dictated directly by the input level
+ *
+ * If @irq describes an SGI with multiple sources, we choose the
+ * lowest-numbered source VCPU and clear that bit in the source bitmap.
+ *
+ * The irq_lock must be held by the caller.
+ */
+void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
+{
+	u32 val = irq->intid;
+	bool allow_pending = true;
+
+	if (irq->active) {
+		val |= GICH_LR_ACTIVE_BIT;
+		if (vgic_irq_is_sgi(irq->intid))
+			val |= irq->active_source << GICH_LR_PHYSID_CPUID_SHIFT;
+		if (vgic_irq_is_multi_sgi(irq)) {
+			allow_pending = false;
+			val |= GICH_LR_EOI;
+		}
+	}
+
+	if (irq->group)
+		val |= GICH_LR_GROUP1;
+
+	if (irq->hw && !vgic_irq_needs_resampling(irq)) {
+		val |= GICH_LR_HW;
+		val |= irq->hwintid << GICH_LR_PHYSID_CPUID_SHIFT;
+		/*
+		 * Never set pending+active on a HW interrupt, as the
+		 * pending state is kept at the physical distributor
+		 * level.
+		 */
+		if (irq->active)
+			allow_pending = false;
+	} else {
+		if (irq->config == VGIC_CONFIG_LEVEL) {
+			val |= GICH_LR_EOI;
+
+			/*
+			 * Software resampling doesn't work very well
+			 * if we allow P+A, so let's not do that.
+			 */
+			if (irq->active)
+				allow_pending = false;
+		}
+	}
+
+	if (allow_pending && irq_is_pending(irq)) {
+		val |= GICH_LR_PENDING_BIT;
+
+		if (irq->config == VGIC_CONFIG_EDGE)
+			irq->pending_latch = false;
+
+		if (vgic_irq_is_sgi(irq->intid)) {
+			u32 src = ffs(irq->source);
+
+			if (WARN_RATELIMIT(!src, "No SGI source for INTID %d\n",
+					   irq->intid))
+				return;
+
+			val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
+			irq->source &= ~(1 << (src - 1));
+			if (irq->source) {
+				irq->pending_latch = true;
+				val |= GICH_LR_EOI;
+			}
+		}
+	}
+
+	/*
+	 * Level-triggered mapped IRQs are special because we only observe
+	 * rising edges as input to the VGIC.  We therefore lower the line
+	 * level here, so that we can take new virtual IRQs.  See
+	 * vgic_v2_fold_lr_state for more info.
+	 */
+	if (vgic_irq_is_mapped_level(irq) && (val & GICH_LR_PENDING_BIT))
+		irq->line_level = false;
+
+	/* The GICv2 LR only holds five bits of priority. */
+	val |= (irq->priority >> 3) << GICH_LR_PRIORITY_SHIFT;
+
+	vcpu->arch.vgic_cpu.vgic_v2.vgic_lr[lr] = val;
+}
+
+void vgic_v2_clear_lr(struct kvm_vcpu *vcpu, int lr)
+{
+	vcpu->arch.vgic_cpu.vgic_v2.vgic_lr[lr] = 0;
+}
+
+void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
+{
+	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+	u32 vmcr;
+
+	vmcr = (vmcrp->grpen0 << GICH_VMCR_ENABLE_GRP0_SHIFT) &
+		GICH_VMCR_ENABLE_GRP0_MASK;
+	vmcr |= (vmcrp->grpen1 << GICH_VMCR_ENABLE_GRP1_SHIFT) &
+		GICH_VMCR_ENABLE_GRP1_MASK;
+	vmcr |= (vmcrp->ackctl << GICH_VMCR_ACK_CTL_SHIFT) &
+		GICH_VMCR_ACK_CTL_MASK;
+	vmcr |= (vmcrp->fiqen << GICH_VMCR_FIQ_EN_SHIFT) &
+		GICH_VMCR_FIQ_EN_MASK;
+	vmcr |= (vmcrp->cbpr << GICH_VMCR_CBPR_SHIFT) &
+		GICH_VMCR_CBPR_MASK;
+	vmcr |= (vmcrp->eoim << GICH_VMCR_EOI_MODE_SHIFT) &
+		GICH_VMCR_EOI_MODE_MASK;
+	vmcr |= (vmcrp->abpr << GICH_VMCR_ALIAS_BINPOINT_SHIFT) &
+		GICH_VMCR_ALIAS_BINPOINT_MASK;
+	vmcr |= (vmcrp->bpr << GICH_VMCR_BINPOINT_SHIFT) &
+		GICH_VMCR_BINPOINT_MASK;
+	vmcr |= ((vmcrp->pmr >> GICV_PMR_PRIORITY_SHIFT) <<
+		 GICH_VMCR_PRIMASK_SHIFT) & GICH_VMCR_PRIMASK_MASK;
+
+	cpu_if->vgic_vmcr = vmcr;
+}
+
+void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
+{
+	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+	u32 vmcr;
+
+	vmcr = cpu_if->vgic_vmcr;
+
+	vmcrp->grpen0 = (vmcr & GICH_VMCR_ENABLE_GRP0_MASK) >>
+		GICH_VMCR_ENABLE_GRP0_SHIFT;
+	vmcrp->grpen1 = (vmcr & GICH_VMCR_ENABLE_GRP1_MASK) >>
+		GICH_VMCR_ENABLE_GRP1_SHIFT;
+	vmcrp->ackctl = (vmcr & GICH_VMCR_ACK_CTL_MASK) >>
+		GICH_VMCR_ACK_CTL_SHIFT;
+	vmcrp->fiqen = (vmcr & GICH_VMCR_FIQ_EN_MASK) >>
+		GICH_VMCR_FIQ_EN_SHIFT;
+	vmcrp->cbpr = (vmcr & GICH_VMCR_CBPR_MASK) >>
+		GICH_VMCR_CBPR_SHIFT;
+	vmcrp->eoim = (vmcr & GICH_VMCR_EOI_MODE_MASK) >>
+		GICH_VMCR_EOI_MODE_SHIFT;
+
+	vmcrp->abpr = (vmcr & GICH_VMCR_ALIAS_BINPOINT_MASK) >>
+			GICH_VMCR_ALIAS_BINPOINT_SHIFT;
+	vmcrp->bpr  = (vmcr & GICH_VMCR_BINPOINT_MASK) >>
+			GICH_VMCR_BINPOINT_SHIFT;
+	vmcrp->pmr  = ((vmcr & GICH_VMCR_PRIMASK_MASK) >>
+			GICH_VMCR_PRIMASK_SHIFT) << GICV_PMR_PRIORITY_SHIFT;
+}
+
+void vgic_v2_enable(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * By forcing VMCR to zero, the GIC will restore the binary
+	 * points to their reset values. Anything else resets to zero
+	 * anyway.
+	 */
+	vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = 0;
+
+	/* Get the show on the road... */
+	vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr = GICH_HCR_EN;
+}
+
+/* check for overlapping regions and for regions crossing the end of memory */
+static bool vgic_v2_check_base(gpa_t dist_base, gpa_t cpu_base)
+{
+	if (dist_base + KVM_VGIC_V2_DIST_SIZE < dist_base)
+		return false;
+	if (cpu_base + KVM_VGIC_V2_CPU_SIZE < cpu_base)
+		return false;
+
+	if (dist_base + KVM_VGIC_V2_DIST_SIZE <= cpu_base)
+		return true;
+	if (cpu_base + KVM_VGIC_V2_CPU_SIZE <= dist_base)
+		return true;
+
+	return false;
+}
+
+int vgic_v2_map_resources(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	int ret = 0;
+
+	if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base) ||
+	    IS_VGIC_ADDR_UNDEF(dist->vgic_cpu_base)) {
+		kvm_debug("Need to set vgic cpu and dist addresses first\n");
+		return -ENXIO;
+	}
+
+	if (!vgic_v2_check_base(dist->vgic_dist_base, dist->vgic_cpu_base)) {
+		kvm_debug("VGIC CPU and dist frames overlap\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Initialize the vgic if this hasn't already been done on demand by
+	 * accessing the vgic state from userspace.
+	 */
+	ret = vgic_init(kvm);
+	if (ret) {
+		kvm_err("Unable to initialize VGIC dynamic data structures\n");
+		return ret;
+	}
+
+	if (!static_branch_unlikely(&vgic_v2_cpuif_trap)) {
+		ret = kvm_phys_addr_ioremap(kvm, dist->vgic_cpu_base,
+					    kvm_vgic_global_state.vcpu_base,
+					    KVM_VGIC_V2_CPU_SIZE, true);
+		if (ret) {
+			kvm_err("Unable to remap VGIC CPU to VCPU\n");
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+DEFINE_STATIC_KEY_FALSE(vgic_v2_cpuif_trap);
+
+/**
+ * vgic_v2_probe - probe for a VGICv2 compatible interrupt controller
+ * @info:	pointer to the GIC description
+ *
+ * Returns 0 if the VGICv2 has been probed successfully, returns an error code
+ * otherwise
+ */
+int vgic_v2_probe(const struct gic_kvm_info *info)
+{
+	int ret;
+	u32 vtr;
+
+	if (is_protected_kvm_enabled()) {
+		kvm_err("GICv2 not supported in protected mode\n");
+		return -ENXIO;
+	}
+
+	if (!info->vctrl.start) {
+		kvm_err("GICH not present in the firmware table\n");
+		return -ENXIO;
+	}
+
+	if (!PAGE_ALIGNED(info->vcpu.start) ||
+	    !PAGE_ALIGNED(resource_size(&info->vcpu))) {
+		kvm_info("GICV region size/alignment is unsafe, using trapping (reduced performance)\n");
+
+		ret = create_hyp_io_mappings(info->vcpu.start,
+					     resource_size(&info->vcpu),
+					     &kvm_vgic_global_state.vcpu_base_va,
+					     &kvm_vgic_global_state.vcpu_hyp_va);
+		if (ret) {
+			kvm_err("Cannot map GICV into hyp\n");
+			goto out;
+		}
+
+		static_branch_enable(&vgic_v2_cpuif_trap);
+	}
+
+	ret = create_hyp_io_mappings(info->vctrl.start,
+				     resource_size(&info->vctrl),
+				     &kvm_vgic_global_state.vctrl_base,
+				     &kvm_vgic_global_state.vctrl_hyp);
+	if (ret) {
+		kvm_err("Cannot map VCTRL into hyp\n");
+		goto out;
+	}
+
+	vtr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR);
+	kvm_vgic_global_state.nr_lr = (vtr & 0x3f) + 1;
+
+	ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
+	if (ret) {
+		kvm_err("Cannot register GICv2 KVM device\n");
+		goto out;
+	}
+
+	kvm_vgic_global_state.can_emulate_gicv2 = true;
+	kvm_vgic_global_state.vcpu_base = info->vcpu.start;
+	kvm_vgic_global_state.type = VGIC_V2;
+	kvm_vgic_global_state.max_gic_vcpus = VGIC_V2_MAX_CPUS;
+
+	kvm_debug("vgic-v2@%llx\n", info->vctrl.start);
+
+	return 0;
+out:
+	if (kvm_vgic_global_state.vctrl_base)
+		iounmap(kvm_vgic_global_state.vctrl_base);
+	if (kvm_vgic_global_state.vcpu_base_va)
+		iounmap(kvm_vgic_global_state.vcpu_base_va);
+
+	return ret;
+}
+
+static void save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)
+{
+	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+	u64 used_lrs = cpu_if->used_lrs;
+	u64 elrsr;
+	int i;
+
+	elrsr = readl_relaxed(base + GICH_ELRSR0);
+	if (unlikely(used_lrs > 32))
+		elrsr |= ((u64)readl_relaxed(base + GICH_ELRSR1)) << 32;
+
+	for (i = 0; i < used_lrs; i++) {
+		if (elrsr & (1UL << i))
+			cpu_if->vgic_lr[i] &= ~GICH_LR_STATE;
+		else
+			cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
+
+		writel_relaxed(0, base + GICH_LR0 + (i * 4));
+	}
+}
+
+void vgic_v2_save_state(struct kvm_vcpu *vcpu)
+{
+	void __iomem *base = kvm_vgic_global_state.vctrl_base;
+	u64 used_lrs = vcpu->arch.vgic_cpu.vgic_v2.used_lrs;
+
+	if (!base)
+		return;
+
+	if (used_lrs) {
+		save_lrs(vcpu, base);
+		writel_relaxed(0, base + GICH_HCR);
+	}
+}
+
+void vgic_v2_restore_state(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+	void __iomem *base = kvm_vgic_global_state.vctrl_base;
+	u64 used_lrs = cpu_if->used_lrs;
+	int i;
+
+	if (!base)
+		return;
+
+	if (used_lrs) {
+		writel_relaxed(cpu_if->vgic_hcr, base + GICH_HCR);
+		for (i = 0; i < used_lrs; i++) {
+			writel_relaxed(cpu_if->vgic_lr[i],
+				       base + GICH_LR0 + (i * 4));
+		}
+	}
+}
+
+void vgic_v2_load(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+
+	writel_relaxed(cpu_if->vgic_vmcr,
+		       kvm_vgic_global_state.vctrl_base + GICH_VMCR);
+	writel_relaxed(cpu_if->vgic_apr,
+		       kvm_vgic_global_state.vctrl_base + GICH_APR);
+}
+
+void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+
+	cpu_if->vgic_vmcr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VMCR);
+}
+
+void vgic_v2_put(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
+
+	vgic_v2_vmcr_sync(vcpu);
+	cpu_if->vgic_apr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_APR);
+}
diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c
new file mode 100644
index 000000000..1f8eea53e
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-v3.c
@@ -0,0 +1,753 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/irqchip/arm-gic-v3.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <kvm/arm_vgic.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/kvm_asm.h>
+
+#include "vgic.h"
+
+static bool group0_trap;
+static bool group1_trap;
+static bool common_trap;
+static bool dir_trap;
+static bool gicv4_enable;
+
+void vgic_v3_set_underflow(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	cpuif->vgic_hcr |= ICH_HCR_UIE;
+}
+
+static bool lr_signals_eoi_mi(u64 lr_val)
+{
+	return !(lr_val & ICH_LR_STATE) && (lr_val & ICH_LR_EOI) &&
+	       !(lr_val & ICH_LR_HW);
+}
+
+void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_v3_cpu_if *cpuif = &vgic_cpu->vgic_v3;
+	u32 model = vcpu->kvm->arch.vgic.vgic_model;
+	int lr;
+
+	DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
+
+	cpuif->vgic_hcr &= ~ICH_HCR_UIE;
+
+	for (lr = 0; lr < cpuif->used_lrs; lr++) {
+		u64 val = cpuif->vgic_lr[lr];
+		u32 intid, cpuid;
+		struct vgic_irq *irq;
+		bool is_v2_sgi = false;
+		bool deactivated;
+
+		cpuid = val & GICH_LR_PHYSID_CPUID;
+		cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
+
+		if (model == KVM_DEV_TYPE_ARM_VGIC_V3) {
+			intid = val & ICH_LR_VIRTUAL_ID_MASK;
+		} else {
+			intid = val & GICH_LR_VIRTUALID;
+			is_v2_sgi = vgic_irq_is_sgi(intid);
+		}
+
+		/* Notify fds when the guest EOI'ed a level-triggered IRQ */
+		if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid))
+			kvm_notify_acked_irq(vcpu->kvm, 0,
+					     intid - VGIC_NR_PRIVATE_IRQS);
+
+		irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
+		if (!irq)	/* An LPI could have been unmapped. */
+			continue;
+
+		raw_spin_lock(&irq->irq_lock);
+
+		/* Always preserve the active bit, note deactivation */
+		deactivated = irq->active && !(val & ICH_LR_ACTIVE_BIT);
+		irq->active = !!(val & ICH_LR_ACTIVE_BIT);
+
+		if (irq->active && is_v2_sgi)
+			irq->active_source = cpuid;
+
+		/* Edge is the only case where we preserve the pending bit */
+		if (irq->config == VGIC_CONFIG_EDGE &&
+		    (val & ICH_LR_PENDING_BIT)) {
+			irq->pending_latch = true;
+
+			if (is_v2_sgi)
+				irq->source |= (1 << cpuid);
+		}
+
+		/*
+		 * Clear soft pending state when level irqs have been acked.
+		 */
+		if (irq->config == VGIC_CONFIG_LEVEL && !(val & ICH_LR_STATE))
+			irq->pending_latch = false;
+
+		/* Handle resampling for mapped interrupts if required */
+		vgic_irq_handle_resampling(irq, deactivated, val & ICH_LR_PENDING_BIT);
+
+		raw_spin_unlock(&irq->irq_lock);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+
+	cpuif->used_lrs = 0;
+}
+
+/* Requires the irq to be locked already */
+void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
+{
+	u32 model = vcpu->kvm->arch.vgic.vgic_model;
+	u64 val = irq->intid;
+	bool allow_pending = true, is_v2_sgi;
+
+	is_v2_sgi = (vgic_irq_is_sgi(irq->intid) &&
+		     model == KVM_DEV_TYPE_ARM_VGIC_V2);
+
+	if (irq->active) {
+		val |= ICH_LR_ACTIVE_BIT;
+		if (is_v2_sgi)
+			val |= irq->active_source << GICH_LR_PHYSID_CPUID_SHIFT;
+		if (vgic_irq_is_multi_sgi(irq)) {
+			allow_pending = false;
+			val |= ICH_LR_EOI;
+		}
+	}
+
+	if (irq->hw && !vgic_irq_needs_resampling(irq)) {
+		val |= ICH_LR_HW;
+		val |= ((u64)irq->hwintid) << ICH_LR_PHYS_ID_SHIFT;
+		/*
+		 * Never set pending+active on a HW interrupt, as the
+		 * pending state is kept at the physical distributor
+		 * level.
+		 */
+		if (irq->active)
+			allow_pending = false;
+	} else {
+		if (irq->config == VGIC_CONFIG_LEVEL) {
+			val |= ICH_LR_EOI;
+
+			/*
+			 * Software resampling doesn't work very well
+			 * if we allow P+A, so let's not do that.
+			 */
+			if (irq->active)
+				allow_pending = false;
+		}
+	}
+
+	if (allow_pending && irq_is_pending(irq)) {
+		val |= ICH_LR_PENDING_BIT;
+
+		if (irq->config == VGIC_CONFIG_EDGE)
+			irq->pending_latch = false;
+
+		if (vgic_irq_is_sgi(irq->intid) &&
+		    model == KVM_DEV_TYPE_ARM_VGIC_V2) {
+			u32 src = ffs(irq->source);
+
+			if (WARN_RATELIMIT(!src, "No SGI source for INTID %d\n",
+					   irq->intid))
+				return;
+
+			val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
+			irq->source &= ~(1 << (src - 1));
+			if (irq->source) {
+				irq->pending_latch = true;
+				val |= ICH_LR_EOI;
+			}
+		}
+	}
+
+	/*
+	 * Level-triggered mapped IRQs are special because we only observe
+	 * rising edges as input to the VGIC.  We therefore lower the line
+	 * level here, so that we can take new virtual IRQs.  See
+	 * vgic_v3_fold_lr_state for more info.
+	 */
+	if (vgic_irq_is_mapped_level(irq) && (val & ICH_LR_PENDING_BIT))
+		irq->line_level = false;
+
+	if (irq->group)
+		val |= ICH_LR_GROUP;
+
+	val |= (u64)irq->priority << ICH_LR_PRIORITY_SHIFT;
+
+	vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = val;
+}
+
+void vgic_v3_clear_lr(struct kvm_vcpu *vcpu, int lr)
+{
+	vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = 0;
+}
+
+void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
+{
+	struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
+	u32 model = vcpu->kvm->arch.vgic.vgic_model;
+	u32 vmcr;
+
+	if (model == KVM_DEV_TYPE_ARM_VGIC_V2) {
+		vmcr = (vmcrp->ackctl << ICH_VMCR_ACK_CTL_SHIFT) &
+			ICH_VMCR_ACK_CTL_MASK;
+		vmcr |= (vmcrp->fiqen << ICH_VMCR_FIQ_EN_SHIFT) &
+			ICH_VMCR_FIQ_EN_MASK;
+	} else {
+		/*
+		 * When emulating GICv3 on GICv3 with SRE=1 on the
+		 * VFIQEn bit is RES1 and the VAckCtl bit is RES0.
+		 */
+		vmcr = ICH_VMCR_FIQ_EN_MASK;
+	}
+
+	vmcr |= (vmcrp->cbpr << ICH_VMCR_CBPR_SHIFT) & ICH_VMCR_CBPR_MASK;
+	vmcr |= (vmcrp->eoim << ICH_VMCR_EOIM_SHIFT) & ICH_VMCR_EOIM_MASK;
+	vmcr |= (vmcrp->abpr << ICH_VMCR_BPR1_SHIFT) & ICH_VMCR_BPR1_MASK;
+	vmcr |= (vmcrp->bpr << ICH_VMCR_BPR0_SHIFT) & ICH_VMCR_BPR0_MASK;
+	vmcr |= (vmcrp->pmr << ICH_VMCR_PMR_SHIFT) & ICH_VMCR_PMR_MASK;
+	vmcr |= (vmcrp->grpen0 << ICH_VMCR_ENG0_SHIFT) & ICH_VMCR_ENG0_MASK;
+	vmcr |= (vmcrp->grpen1 << ICH_VMCR_ENG1_SHIFT) & ICH_VMCR_ENG1_MASK;
+
+	cpu_if->vgic_vmcr = vmcr;
+}
+
+void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
+{
+	struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
+	u32 model = vcpu->kvm->arch.vgic.vgic_model;
+	u32 vmcr;
+
+	vmcr = cpu_if->vgic_vmcr;
+
+	if (model == KVM_DEV_TYPE_ARM_VGIC_V2) {
+		vmcrp->ackctl = (vmcr & ICH_VMCR_ACK_CTL_MASK) >>
+			ICH_VMCR_ACK_CTL_SHIFT;
+		vmcrp->fiqen = (vmcr & ICH_VMCR_FIQ_EN_MASK) >>
+			ICH_VMCR_FIQ_EN_SHIFT;
+	} else {
+		/*
+		 * When emulating GICv3 on GICv3 with SRE=1 on the
+		 * VFIQEn bit is RES1 and the VAckCtl bit is RES0.
+		 */
+		vmcrp->fiqen = 1;
+		vmcrp->ackctl = 0;
+	}
+
+	vmcrp->cbpr = (vmcr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT;
+	vmcrp->eoim = (vmcr & ICH_VMCR_EOIM_MASK) >> ICH_VMCR_EOIM_SHIFT;
+	vmcrp->abpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
+	vmcrp->bpr  = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
+	vmcrp->pmr  = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
+	vmcrp->grpen0 = (vmcr & ICH_VMCR_ENG0_MASK) >> ICH_VMCR_ENG0_SHIFT;
+	vmcrp->grpen1 = (vmcr & ICH_VMCR_ENG1_MASK) >> ICH_VMCR_ENG1_SHIFT;
+}
+
+#define INITIAL_PENDBASER_VALUE						  \
+	(GIC_BASER_CACHEABILITY(GICR_PENDBASER, INNER, RaWb)		| \
+	GIC_BASER_CACHEABILITY(GICR_PENDBASER, OUTER, SameAsInner)	| \
+	GIC_BASER_SHAREABILITY(GICR_PENDBASER, InnerShareable))
+
+void vgic_v3_enable(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	/*
+	 * By forcing VMCR to zero, the GIC will restore the binary
+	 * points to their reset values. Anything else resets to zero
+	 * anyway.
+	 */
+	vgic_v3->vgic_vmcr = 0;
+
+	/*
+	 * If we are emulating a GICv3, we do it in an non-GICv2-compatible
+	 * way, so we force SRE to 1 to demonstrate this to the guest.
+	 * Also, we don't support any form of IRQ/FIQ bypass.
+	 * This goes with the spec allowing the value to be RAO/WI.
+	 */
+	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
+		vgic_v3->vgic_sre = (ICC_SRE_EL1_DIB |
+				     ICC_SRE_EL1_DFB |
+				     ICC_SRE_EL1_SRE);
+		vcpu->arch.vgic_cpu.pendbaser = INITIAL_PENDBASER_VALUE;
+	} else {
+		vgic_v3->vgic_sre = 0;
+	}
+
+	vcpu->arch.vgic_cpu.num_id_bits = (kvm_vgic_global_state.ich_vtr_el2 &
+					   ICH_VTR_ID_BITS_MASK) >>
+					   ICH_VTR_ID_BITS_SHIFT;
+	vcpu->arch.vgic_cpu.num_pri_bits = ((kvm_vgic_global_state.ich_vtr_el2 &
+					    ICH_VTR_PRI_BITS_MASK) >>
+					    ICH_VTR_PRI_BITS_SHIFT) + 1;
+
+	/* Get the show on the road... */
+	vgic_v3->vgic_hcr = ICH_HCR_EN;
+	if (group0_trap)
+		vgic_v3->vgic_hcr |= ICH_HCR_TALL0;
+	if (group1_trap)
+		vgic_v3->vgic_hcr |= ICH_HCR_TALL1;
+	if (common_trap)
+		vgic_v3->vgic_hcr |= ICH_HCR_TC;
+	if (dir_trap)
+		vgic_v3->vgic_hcr |= ICH_HCR_TDIR;
+}
+
+int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
+{
+	struct kvm_vcpu *vcpu;
+	int byte_offset, bit_nr;
+	gpa_t pendbase, ptr;
+	bool status;
+	u8 val;
+	int ret;
+	unsigned long flags;
+
+retry:
+	vcpu = irq->target_vcpu;
+	if (!vcpu)
+		return 0;
+
+	pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);
+
+	byte_offset = irq->intid / BITS_PER_BYTE;
+	bit_nr = irq->intid % BITS_PER_BYTE;
+	ptr = pendbase + byte_offset;
+
+	ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
+	if (ret)
+		return ret;
+
+	status = val & (1 << bit_nr);
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	if (irq->target_vcpu != vcpu) {
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		goto retry;
+	}
+	irq->pending_latch = status;
+	vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
+
+	if (status) {
+		/* clear consumed data */
+		val &= ~(1 << bit_nr);
+		ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+/*
+ * The deactivation of the doorbell interrupt will trigger the
+ * unmapping of the associated vPE.
+ */
+static void unmap_all_vpes(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	int i;
+
+	for (i = 0; i < dist->its_vm.nr_vpes; i++)
+		free_irq(dist->its_vm.vpes[i]->irq, kvm_get_vcpu(kvm, i));
+}
+
+static void map_all_vpes(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	int i;
+
+	for (i = 0; i < dist->its_vm.nr_vpes; i++)
+		WARN_ON(vgic_v4_request_vpe_irq(kvm_get_vcpu(kvm, i),
+						dist->its_vm.vpes[i]->irq));
+}
+
+/**
+ * vgic_v3_save_pending_tables - Save the pending tables into guest RAM
+ * kvm lock and all vcpu lock must be held
+ */
+int vgic_v3_save_pending_tables(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_irq *irq;
+	gpa_t last_ptr = ~(gpa_t)0;
+	bool vlpi_avail = false;
+	int ret = 0;
+	u8 val;
+
+	if (unlikely(!vgic_initialized(kvm)))
+		return -ENXIO;
+
+	/*
+	 * A preparation for getting any VLPI states.
+	 * The above vgic initialized check also ensures that the allocation
+	 * and enabling of the doorbells have already been done.
+	 */
+	if (kvm_vgic_global_state.has_gicv4_1) {
+		unmap_all_vpes(kvm);
+		vlpi_avail = true;
+	}
+
+	list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
+		int byte_offset, bit_nr;
+		struct kvm_vcpu *vcpu;
+		gpa_t pendbase, ptr;
+		bool is_pending;
+		bool stored;
+
+		vcpu = irq->target_vcpu;
+		if (!vcpu)
+			continue;
+
+		pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser);
+
+		byte_offset = irq->intid / BITS_PER_BYTE;
+		bit_nr = irq->intid % BITS_PER_BYTE;
+		ptr = pendbase + byte_offset;
+
+		if (ptr != last_ptr) {
+			ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
+			if (ret)
+				goto out;
+			last_ptr = ptr;
+		}
+
+		stored = val & (1U << bit_nr);
+
+		is_pending = irq->pending_latch;
+
+		if (irq->hw && vlpi_avail)
+			vgic_v4_get_vlpi_state(irq, &is_pending);
+
+		if (stored == is_pending)
+			continue;
+
+		if (is_pending)
+			val |= 1 << bit_nr;
+		else
+			val &= ~(1 << bit_nr);
+
+		ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
+		if (ret)
+			goto out;
+	}
+
+out:
+	if (vlpi_avail)
+		map_all_vpes(kvm);
+
+	return ret;
+}
+
+/**
+ * vgic_v3_rdist_overlap - check if a region overlaps with any
+ * existing redistributor region
+ *
+ * @kvm: kvm handle
+ * @base: base of the region
+ * @size: size of region
+ *
+ * Return: true if there is an overlap
+ */
+bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size)
+{
+	struct vgic_dist *d = &kvm->arch.vgic;
+	struct vgic_redist_region *rdreg;
+
+	list_for_each_entry(rdreg, &d->rd_regions, list) {
+		if ((base + size > rdreg->base) &&
+			(base < rdreg->base + vgic_v3_rd_region_size(kvm, rdreg)))
+			return true;
+	}
+	return false;
+}
+
+/*
+ * Check for overlapping regions and for regions crossing the end of memory
+ * for base addresses which have already been set.
+ */
+bool vgic_v3_check_base(struct kvm *kvm)
+{
+	struct vgic_dist *d = &kvm->arch.vgic;
+	struct vgic_redist_region *rdreg;
+
+	if (!IS_VGIC_ADDR_UNDEF(d->vgic_dist_base) &&
+	    d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE < d->vgic_dist_base)
+		return false;
+
+	list_for_each_entry(rdreg, &d->rd_regions, list) {
+		size_t sz = vgic_v3_rd_region_size(kvm, rdreg);
+
+		if (vgic_check_iorange(kvm, VGIC_ADDR_UNDEF,
+				       rdreg->base, SZ_64K, sz))
+			return false;
+	}
+
+	if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base))
+		return true;
+
+	return !vgic_v3_rdist_overlap(kvm, d->vgic_dist_base,
+				      KVM_VGIC_V3_DIST_SIZE);
+}
+
+/**
+ * vgic_v3_rdist_free_slot - Look up registered rdist regions and identify one
+ * which has free space to put a new rdist region.
+ *
+ * @rd_regions: redistributor region list head
+ *
+ * A redistributor regions maps n redistributors, n = region size / (2 x 64kB).
+ * Stride between redistributors is 0 and regions are filled in the index order.
+ *
+ * Return: the redist region handle, if any, that has space to map a new rdist
+ * region.
+ */
+struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rd_regions)
+{
+	struct vgic_redist_region *rdreg;
+
+	list_for_each_entry(rdreg, rd_regions, list) {
+		if (!vgic_v3_redist_region_full(rdreg))
+			return rdreg;
+	}
+	return NULL;
+}
+
+struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
+							   u32 index)
+{
+	struct list_head *rd_regions = &kvm->arch.vgic.rd_regions;
+	struct vgic_redist_region *rdreg;
+
+	list_for_each_entry(rdreg, rd_regions, list) {
+		if (rdreg->index == index)
+			return rdreg;
+	}
+	return NULL;
+}
+
+
+int vgic_v3_map_resources(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu;
+	unsigned long c;
+
+	kvm_for_each_vcpu(c, vcpu, kvm) {
+		struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+		if (IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr)) {
+			kvm_debug("vcpu %ld redistributor base not set\n", c);
+			return -ENXIO;
+		}
+	}
+
+	if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base)) {
+		kvm_debug("Need to set vgic distributor addresses first\n");
+		return -ENXIO;
+	}
+
+	if (!vgic_v3_check_base(kvm)) {
+		kvm_debug("VGIC redist and dist frames overlap\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * For a VGICv3 we require the userland to explicitly initialize
+	 * the VGIC before we need to use it.
+	 */
+	if (!vgic_initialized(kvm)) {
+		return -EBUSY;
+	}
+
+	if (kvm_vgic_global_state.has_gicv4_1)
+		vgic_v4_configure_vsgis(kvm);
+
+	return 0;
+}
+
+DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap);
+
+static int __init early_group0_trap_cfg(char *buf)
+{
+	return strtobool(buf, &group0_trap);
+}
+early_param("kvm-arm.vgic_v3_group0_trap", early_group0_trap_cfg);
+
+static int __init early_group1_trap_cfg(char *buf)
+{
+	return strtobool(buf, &group1_trap);
+}
+early_param("kvm-arm.vgic_v3_group1_trap", early_group1_trap_cfg);
+
+static int __init early_common_trap_cfg(char *buf)
+{
+	return strtobool(buf, &common_trap);
+}
+early_param("kvm-arm.vgic_v3_common_trap", early_common_trap_cfg);
+
+static int __init early_gicv4_enable(char *buf)
+{
+	return strtobool(buf, &gicv4_enable);
+}
+early_param("kvm-arm.vgic_v4_enable", early_gicv4_enable);
+
+static const struct midr_range broken_seis[] = {
+	MIDR_ALL_VERSIONS(MIDR_APPLE_M1_ICESTORM),
+	MIDR_ALL_VERSIONS(MIDR_APPLE_M1_FIRESTORM),
+	MIDR_ALL_VERSIONS(MIDR_APPLE_M1_ICESTORM_PRO),
+	MIDR_ALL_VERSIONS(MIDR_APPLE_M1_FIRESTORM_PRO),
+	MIDR_ALL_VERSIONS(MIDR_APPLE_M1_ICESTORM_MAX),
+	MIDR_ALL_VERSIONS(MIDR_APPLE_M1_FIRESTORM_MAX),
+	{},
+};
+
+static bool vgic_v3_broken_seis(void)
+{
+	return ((kvm_vgic_global_state.ich_vtr_el2 & ICH_VTR_SEIS_MASK) &&
+		is_midr_in_range_list(read_cpuid_id(), broken_seis));
+}
+
+/**
+ * vgic_v3_probe - probe for a VGICv3 compatible interrupt controller
+ * @info:	pointer to the GIC description
+ *
+ * Returns 0 if the VGICv3 has been probed successfully, returns an error code
+ * otherwise
+ */
+int vgic_v3_probe(const struct gic_kvm_info *info)
+{
+	u64 ich_vtr_el2 = kvm_call_hyp_ret(__vgic_v3_get_gic_config);
+	bool has_v2;
+	int ret;
+
+	has_v2 = ich_vtr_el2 >> 63;
+	ich_vtr_el2 = (u32)ich_vtr_el2;
+
+	/*
+	 * The ListRegs field is 5 bits, but there is an architectural
+	 * maximum of 16 list registers. Just ignore bit 4...
+	 */
+	kvm_vgic_global_state.nr_lr = (ich_vtr_el2 & 0xf) + 1;
+	kvm_vgic_global_state.can_emulate_gicv2 = false;
+	kvm_vgic_global_state.ich_vtr_el2 = ich_vtr_el2;
+
+	/* GICv4 support? */
+	if (info->has_v4) {
+		kvm_vgic_global_state.has_gicv4 = gicv4_enable;
+		kvm_vgic_global_state.has_gicv4_1 = info->has_v4_1 && gicv4_enable;
+		kvm_info("GICv4%s support %sabled\n",
+			 kvm_vgic_global_state.has_gicv4_1 ? ".1" : "",
+			 gicv4_enable ? "en" : "dis");
+	}
+
+	kvm_vgic_global_state.vcpu_base = 0;
+
+	if (!info->vcpu.start) {
+		kvm_info("GICv3: no GICV resource entry\n");
+	} else if (!has_v2) {
+		pr_warn(FW_BUG "CPU interface incapable of MMIO access\n");
+	} else if (!PAGE_ALIGNED(info->vcpu.start)) {
+		pr_warn("GICV physical address 0x%llx not page aligned\n",
+			(unsigned long long)info->vcpu.start);
+	} else if (kvm_get_mode() != KVM_MODE_PROTECTED) {
+		kvm_vgic_global_state.vcpu_base = info->vcpu.start;
+		kvm_vgic_global_state.can_emulate_gicv2 = true;
+		ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
+		if (ret) {
+			kvm_err("Cannot register GICv2 KVM device.\n");
+			return ret;
+		}
+		kvm_info("vgic-v2@%llx\n", info->vcpu.start);
+	}
+	ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V3);
+	if (ret) {
+		kvm_err("Cannot register GICv3 KVM device.\n");
+		kvm_unregister_device_ops(KVM_DEV_TYPE_ARM_VGIC_V2);
+		return ret;
+	}
+
+	if (kvm_vgic_global_state.vcpu_base == 0)
+		kvm_info("disabling GICv2 emulation\n");
+
+	if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_30115)) {
+		group0_trap = true;
+		group1_trap = true;
+	}
+
+	if (vgic_v3_broken_seis()) {
+		kvm_info("GICv3 with broken locally generated SEI\n");
+
+		kvm_vgic_global_state.ich_vtr_el2 &= ~ICH_VTR_SEIS_MASK;
+		group0_trap = true;
+		group1_trap = true;
+		if (ich_vtr_el2 & ICH_VTR_TDS_MASK)
+			dir_trap = true;
+		else
+			common_trap = true;
+	}
+
+	if (group0_trap || group1_trap || common_trap | dir_trap) {
+		kvm_info("GICv3 sysreg trapping enabled ([%s%s%s%s], reduced performance)\n",
+			 group0_trap ? "G0" : "",
+			 group1_trap ? "G1" : "",
+			 common_trap ? "C"  : "",
+			 dir_trap    ? "D"  : "");
+		static_branch_enable(&vgic_v3_cpuif_trap);
+	}
+
+	kvm_vgic_global_state.vctrl_base = NULL;
+	kvm_vgic_global_state.type = VGIC_V3;
+	kvm_vgic_global_state.max_gic_vcpus = VGIC_V3_MAX_CPUS;
+
+	return 0;
+}
+
+void vgic_v3_load(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	/*
+	 * If dealing with a GICv2 emulation on GICv3, VMCR_EL2.VFIQen
+	 * is dependent on ICC_SRE_EL1.SRE, and we have to perform the
+	 * VMCR_EL2 save/restore in the world switch.
+	 */
+	if (likely(cpu_if->vgic_sre))
+		kvm_call_hyp(__vgic_v3_write_vmcr, cpu_if->vgic_vmcr);
+
+	kvm_call_hyp(__vgic_v3_restore_aprs, cpu_if);
+
+	if (has_vhe())
+		__vgic_v3_activate_traps(cpu_if);
+
+	WARN_ON(vgic_v4_load(vcpu));
+}
+
+void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	if (likely(cpu_if->vgic_sre))
+		cpu_if->vgic_vmcr = kvm_call_hyp_ret(__vgic_v3_read_vmcr);
+}
+
+void vgic_v3_put(struct kvm_vcpu *vcpu)
+{
+	struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	WARN_ON(vgic_v4_put(vcpu));
+
+	vgic_v3_vmcr_sync(vcpu);
+
+	kvm_call_hyp(__vgic_v3_save_aprs, cpu_if);
+
+	if (has_vhe())
+		__vgic_v3_deactivate_traps(cpu_if);
+}
diff --git a/arch/arm64/kvm/vgic/vgic-v4.c b/arch/arm64/kvm/vgic/vgic-v4.c
new file mode 100644
index 000000000..339a55194
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic-v4.c
@@ -0,0 +1,521 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kvm_host.h>
+#include <linux/irqchip/arm-gic-v3.h>
+
+#include "vgic.h"
+
+/*
+ * How KVM uses GICv4 (insert rude comments here):
+ *
+ * The vgic-v4 layer acts as a bridge between several entities:
+ * - The GICv4 ITS representation offered by the ITS driver
+ * - VFIO, which is in charge of the PCI endpoint
+ * - The virtual ITS, which is the only thing the guest sees
+ *
+ * The configuration of VLPIs is triggered by a callback from VFIO,
+ * instructing KVM that a PCI device has been configured to deliver
+ * MSIs to a vITS.
+ *
+ * kvm_vgic_v4_set_forwarding() is thus called with the routing entry,
+ * and this is used to find the corresponding vITS data structures
+ * (ITS instance, device, event and irq) using a process that is
+ * extremely similar to the injection of an MSI.
+ *
+ * At this stage, we can link the guest's view of an LPI (uniquely
+ * identified by the routing entry) and the host irq, using the GICv4
+ * driver mapping operation. Should the mapping succeed, we've then
+ * successfully upgraded the guest's LPI to a VLPI. We can then start
+ * with updating GICv4's view of the property table and generating an
+ * INValidation in order to kickstart the delivery of this VLPI to the
+ * guest directly, without software intervention. Well, almost.
+ *
+ * When the PCI endpoint is deconfigured, this operation is reversed
+ * with VFIO calling kvm_vgic_v4_unset_forwarding().
+ *
+ * Once the VLPI has been mapped, it needs to follow any change the
+ * guest performs on its LPI through the vITS. For that, a number of
+ * command handlers have hooks to communicate these changes to the HW:
+ * - Any invalidation triggers a call to its_prop_update_vlpi()
+ * - The INT command results in a irq_set_irqchip_state(), which
+ *   generates an INT on the corresponding VLPI.
+ * - The CLEAR command results in a irq_set_irqchip_state(), which
+ *   generates an CLEAR on the corresponding VLPI.
+ * - DISCARD translates into an unmap, similar to a call to
+ *   kvm_vgic_v4_unset_forwarding().
+ * - MOVI is translated by an update of the existing mapping, changing
+ *   the target vcpu, resulting in a VMOVI being generated.
+ * - MOVALL is translated by a string of mapping updates (similar to
+ *   the handling of MOVI). MOVALL is horrible.
+ *
+ * Note that a DISCARD/MAPTI sequence emitted from the guest without
+ * reprogramming the PCI endpoint after MAPTI does not result in a
+ * VLPI being mapped, as there is no callback from VFIO (the guest
+ * will get the interrupt via the normal SW injection). Fixing this is
+ * not trivial, and requires some horrible messing with the VFIO
+ * internals. Not fun. Don't do that.
+ *
+ * Then there is the scheduling. Each time a vcpu is about to run on a
+ * physical CPU, KVM must tell the corresponding redistributor about
+ * it. And if we've migrated our vcpu from one CPU to another, we must
+ * tell the ITS (so that the messages reach the right redistributor).
+ * This is done in two steps: first issue a irq_set_affinity() on the
+ * irq corresponding to the vcpu, then call its_make_vpe_resident().
+ * You must be in a non-preemptible context. On exit, a call to
+ * its_make_vpe_non_resident() tells the redistributor that we're done
+ * with the vcpu.
+ *
+ * Finally, the doorbell handling: Each vcpu is allocated an interrupt
+ * which will fire each time a VLPI is made pending whilst the vcpu is
+ * not running. Each time the vcpu gets blocked, the doorbell
+ * interrupt gets enabled. When the vcpu is unblocked (for whatever
+ * reason), the doorbell interrupt is disabled.
+ */
+
+#define DB_IRQ_FLAGS	(IRQ_NOAUTOEN | IRQ_DISABLE_UNLAZY | IRQ_NO_BALANCING)
+
+static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info)
+{
+	struct kvm_vcpu *vcpu = info;
+
+	/* We got the message, no need to fire again */
+	if (!kvm_vgic_global_state.has_gicv4_1 &&
+	    !irqd_irq_disabled(&irq_to_desc(irq)->irq_data))
+		disable_irq_nosync(irq);
+
+	/*
+	 * The v4.1 doorbell can fire concurrently with the vPE being
+	 * made non-resident. Ensure we only update pending_last
+	 * *after* the non-residency sequence has completed.
+	 */
+	raw_spin_lock(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vpe_lock);
+	vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last = true;
+	raw_spin_unlock(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vpe_lock);
+
+	kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
+	kvm_vcpu_kick(vcpu);
+
+	return IRQ_HANDLED;
+}
+
+static void vgic_v4_sync_sgi_config(struct its_vpe *vpe, struct vgic_irq *irq)
+{
+	vpe->sgi_config[irq->intid].enabled	= irq->enabled;
+	vpe->sgi_config[irq->intid].group 	= irq->group;
+	vpe->sgi_config[irq->intid].priority	= irq->priority;
+}
+
+static void vgic_v4_enable_vsgis(struct kvm_vcpu *vcpu)
+{
+	struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+	int i;
+
+	/*
+	 * With GICv4.1, every virtual SGI can be directly injected. So
+	 * let's pretend that they are HW interrupts, tied to a host
+	 * IRQ. The SGI code will do its magic.
+	 */
+	for (i = 0; i < VGIC_NR_SGIS; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, i);
+		struct irq_desc *desc;
+		unsigned long flags;
+		int ret;
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		if (irq->hw)
+			goto unlock;
+
+		irq->hw = true;
+		irq->host_irq = irq_find_mapping(vpe->sgi_domain, i);
+
+		/* Transfer the full irq state to the vPE */
+		vgic_v4_sync_sgi_config(vpe, irq);
+		desc = irq_to_desc(irq->host_irq);
+		ret = irq_domain_activate_irq(irq_desc_get_irq_data(desc),
+					      false);
+		if (!WARN_ON(ret)) {
+			/* Transfer pending state */
+			ret = irq_set_irqchip_state(irq->host_irq,
+						    IRQCHIP_STATE_PENDING,
+						    irq->pending_latch);
+			WARN_ON(ret);
+			irq->pending_latch = false;
+		}
+	unlock:
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+static void vgic_v4_disable_vsgis(struct kvm_vcpu *vcpu)
+{
+	int i;
+
+	for (i = 0; i < VGIC_NR_SGIS; i++) {
+		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, i);
+		struct irq_desc *desc;
+		unsigned long flags;
+		int ret;
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+		if (!irq->hw)
+			goto unlock;
+
+		irq->hw = false;
+		ret = irq_get_irqchip_state(irq->host_irq,
+					    IRQCHIP_STATE_PENDING,
+					    &irq->pending_latch);
+		WARN_ON(ret);
+
+		desc = irq_to_desc(irq->host_irq);
+		irq_domain_deactivate_irq(irq_desc_get_irq_data(desc));
+	unlock:
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(vcpu->kvm, irq);
+	}
+}
+
+void vgic_v4_configure_vsgis(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu;
+	unsigned long i;
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+
+	kvm_arm_halt_guest(kvm);
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (dist->nassgireq)
+			vgic_v4_enable_vsgis(vcpu);
+		else
+			vgic_v4_disable_vsgis(vcpu);
+	}
+
+	kvm_arm_resume_guest(kvm);
+}
+
+/*
+ * Must be called with GICv4.1 and the vPE unmapped, which
+ * indicates the invalidation of any VPT caches associated
+ * with the vPE, thus we can get the VLPI state by peeking
+ * at the VPT.
+ */
+void vgic_v4_get_vlpi_state(struct vgic_irq *irq, bool *val)
+{
+	struct its_vpe *vpe = &irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+	int mask = BIT(irq->intid % BITS_PER_BYTE);
+	void *va;
+	u8 *ptr;
+
+	va = page_address(vpe->vpt_page);
+	ptr = va + irq->intid / BITS_PER_BYTE;
+
+	*val = !!(*ptr & mask);
+}
+
+int vgic_v4_request_vpe_irq(struct kvm_vcpu *vcpu, int irq)
+{
+	return request_irq(irq, vgic_v4_doorbell_handler, 0, "vcpu", vcpu);
+}
+
+/**
+ * vgic_v4_init - Initialize the GICv4 data structures
+ * @kvm:	Pointer to the VM being initialized
+ *
+ * We may be called each time a vITS is created, or when the
+ * vgic is initialized. In both cases, the number of vcpus
+ * should now be fixed.
+ */
+int vgic_v4_init(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu;
+	int nr_vcpus, ret;
+	unsigned long i;
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+
+	if (!kvm_vgic_global_state.has_gicv4)
+		return 0; /* Nothing to see here... move along. */
+
+	if (dist->its_vm.vpes)
+		return 0;
+
+	nr_vcpus = atomic_read(&kvm->online_vcpus);
+
+	dist->its_vm.vpes = kcalloc(nr_vcpus, sizeof(*dist->its_vm.vpes),
+				    GFP_KERNEL_ACCOUNT);
+	if (!dist->its_vm.vpes)
+		return -ENOMEM;
+
+	dist->its_vm.nr_vpes = nr_vcpus;
+
+	kvm_for_each_vcpu(i, vcpu, kvm)
+		dist->its_vm.vpes[i] = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+
+	ret = its_alloc_vcpu_irqs(&dist->its_vm);
+	if (ret < 0) {
+		kvm_err("VPE IRQ allocation failure\n");
+		kfree(dist->its_vm.vpes);
+		dist->its_vm.nr_vpes = 0;
+		dist->its_vm.vpes = NULL;
+		return ret;
+	}
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		int irq = dist->its_vm.vpes[i]->irq;
+		unsigned long irq_flags = DB_IRQ_FLAGS;
+
+		/*
+		 * Don't automatically enable the doorbell, as we're
+		 * flipping it back and forth when the vcpu gets
+		 * blocked. Also disable the lazy disabling, as the
+		 * doorbell could kick us out of the guest too
+		 * early...
+		 *
+		 * On GICv4.1, the doorbell is managed in HW and must
+		 * be left enabled.
+		 */
+		if (kvm_vgic_global_state.has_gicv4_1)
+			irq_flags &= ~IRQ_NOAUTOEN;
+		irq_set_status_flags(irq, irq_flags);
+
+		ret = vgic_v4_request_vpe_irq(vcpu, irq);
+		if (ret) {
+			kvm_err("failed to allocate vcpu IRQ%d\n", irq);
+			/*
+			 * Trick: adjust the number of vpes so we know
+			 * how many to nuke on teardown...
+			 */
+			dist->its_vm.nr_vpes = i;
+			break;
+		}
+	}
+
+	if (ret)
+		vgic_v4_teardown(kvm);
+
+	return ret;
+}
+
+/**
+ * vgic_v4_teardown - Free the GICv4 data structures
+ * @kvm:	Pointer to the VM being destroyed
+ */
+void vgic_v4_teardown(struct kvm *kvm)
+{
+	struct its_vm *its_vm = &kvm->arch.vgic.its_vm;
+	int i;
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+
+	if (!its_vm->vpes)
+		return;
+
+	for (i = 0; i < its_vm->nr_vpes; i++) {
+		struct kvm_vcpu *vcpu = kvm_get_vcpu(kvm, i);
+		int irq = its_vm->vpes[i]->irq;
+
+		irq_clear_status_flags(irq, DB_IRQ_FLAGS);
+		free_irq(irq, vcpu);
+	}
+
+	its_free_vcpu_irqs(its_vm);
+	kfree(its_vm->vpes);
+	its_vm->nr_vpes = 0;
+	its_vm->vpes = NULL;
+}
+
+int vgic_v4_put(struct kvm_vcpu *vcpu)
+{
+	struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+
+	if (!vgic_supports_direct_msis(vcpu->kvm) || !vpe->resident)
+		return 0;
+
+	return its_make_vpe_non_resident(vpe, !!vcpu_get_flag(vcpu, IN_WFI));
+}
+
+int vgic_v4_load(struct kvm_vcpu *vcpu)
+{
+	struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+	int err;
+
+	if (!vgic_supports_direct_msis(vcpu->kvm) || vpe->resident)
+		return 0;
+
+	if (vcpu_get_flag(vcpu, IN_WFI))
+		return 0;
+
+	/*
+	 * Before making the VPE resident, make sure the redistributor
+	 * corresponding to our current CPU expects us here. See the
+	 * doc in drivers/irqchip/irq-gic-v4.c to understand how this
+	 * turns into a VMOVP command at the ITS level.
+	 */
+	err = irq_set_affinity(vpe->irq, cpumask_of(smp_processor_id()));
+	if (err)
+		return err;
+
+	err = its_make_vpe_resident(vpe, false, vcpu->kvm->arch.vgic.enabled);
+	if (err)
+		return err;
+
+	/*
+	 * Now that the VPE is resident, let's get rid of a potential
+	 * doorbell interrupt that would still be pending. This is a
+	 * GICv4.0 only "feature"...
+	 */
+	if (!kvm_vgic_global_state.has_gicv4_1)
+		err = irq_set_irqchip_state(vpe->irq, IRQCHIP_STATE_PENDING, false);
+
+	return err;
+}
+
+void vgic_v4_commit(struct kvm_vcpu *vcpu)
+{
+	struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+
+	/*
+	 * No need to wait for the vPE to be ready across a shallow guest
+	 * exit, as only a vcpu_put will invalidate it.
+	 */
+	if (!vpe->ready)
+		its_commit_vpe(vpe);
+}
+
+static struct vgic_its *vgic_get_its(struct kvm *kvm,
+				     struct kvm_kernel_irq_routing_entry *irq_entry)
+{
+	struct kvm_msi msi  = (struct kvm_msi) {
+		.address_lo	= irq_entry->msi.address_lo,
+		.address_hi	= irq_entry->msi.address_hi,
+		.data		= irq_entry->msi.data,
+		.flags		= irq_entry->msi.flags,
+		.devid		= irq_entry->msi.devid,
+	};
+
+	return vgic_msi_to_its(kvm, &msi);
+}
+
+int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
+			       struct kvm_kernel_irq_routing_entry *irq_entry)
+{
+	struct vgic_its *its;
+	struct vgic_irq *irq;
+	struct its_vlpi_map map;
+	unsigned long flags;
+	int ret;
+
+	if (!vgic_supports_direct_msis(kvm))
+		return 0;
+
+	/*
+	 * Get the ITS, and escape early on error (not a valid
+	 * doorbell for any of our vITSs).
+	 */
+	its = vgic_get_its(kvm, irq_entry);
+	if (IS_ERR(its))
+		return 0;
+
+	mutex_lock(&its->its_lock);
+
+	/* Perform the actual DevID/EventID -> LPI translation. */
+	ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid,
+				   irq_entry->msi.data, &irq);
+	if (ret)
+		goto out;
+
+	/*
+	 * Emit the mapping request. If it fails, the ITS probably
+	 * isn't v4 compatible, so let's silently bail out. Holding
+	 * the ITS lock should ensure that nothing can modify the
+	 * target vcpu.
+	 */
+	map = (struct its_vlpi_map) {
+		.vm		= &kvm->arch.vgic.its_vm,
+		.vpe		= &irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe,
+		.vintid		= irq->intid,
+		.properties	= ((irq->priority & 0xfc) |
+				   (irq->enabled ? LPI_PROP_ENABLED : 0) |
+				   LPI_PROP_GROUP1),
+		.db_enabled	= true,
+	};
+
+	ret = its_map_vlpi(virq, &map);
+	if (ret)
+		goto out;
+
+	irq->hw		= true;
+	irq->host_irq	= virq;
+	atomic_inc(&map.vpe->vlpi_count);
+
+	/* Transfer pending state */
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	if (irq->pending_latch) {
+		ret = irq_set_irqchip_state(irq->host_irq,
+					    IRQCHIP_STATE_PENDING,
+					    irq->pending_latch);
+		WARN_RATELIMIT(ret, "IRQ %d", irq->host_irq);
+
+		/*
+		 * Clear pending_latch and communicate this state
+		 * change via vgic_queue_irq_unlock.
+		 */
+		irq->pending_latch = false;
+		vgic_queue_irq_unlock(kvm, irq, flags);
+	} else {
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+	}
+
+out:
+	mutex_unlock(&its->its_lock);
+	return ret;
+}
+
+int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int virq,
+				 struct kvm_kernel_irq_routing_entry *irq_entry)
+{
+	struct vgic_its *its;
+	struct vgic_irq *irq;
+	int ret;
+
+	if (!vgic_supports_direct_msis(kvm))
+		return 0;
+
+	/*
+	 * Get the ITS, and escape early on error (not a valid
+	 * doorbell for any of our vITSs).
+	 */
+	its = vgic_get_its(kvm, irq_entry);
+	if (IS_ERR(its))
+		return 0;
+
+	mutex_lock(&its->its_lock);
+
+	ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid,
+				   irq_entry->msi.data, &irq);
+	if (ret)
+		goto out;
+
+	WARN_ON(!(irq->hw && irq->host_irq == virq));
+	if (irq->hw) {
+		atomic_dec(&irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count);
+		irq->hw = false;
+		ret = its_unmap_vlpi(virq);
+	}
+
+out:
+	mutex_unlock(&its->its_lock);
+	return ret;
+}
diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c
new file mode 100644
index 000000000..0a005da83
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic.c
@@ -0,0 +1,1063 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015, 2016 ARM Ltd.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/list_sort.h>
+#include <linux/nospec.h>
+
+#include <asm/kvm_hyp.h>
+
+#include "vgic.h"
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+struct vgic_global kvm_vgic_global_state __ro_after_init = {
+	.gicv3_cpuif = STATIC_KEY_FALSE_INIT,
+};
+
+/*
+ * Locking order is always:
+ * kvm->lock (mutex)
+ *   vcpu->mutex (mutex)
+ *     kvm->arch.config_lock (mutex)
+ *       its->cmd_lock (mutex)
+ *         its->its_lock (mutex)
+ *           vgic_cpu->ap_list_lock		must be taken with IRQs disabled
+ *             kvm->lpi_list_lock		must be taken with IRQs disabled
+ *               vgic_irq->irq_lock		must be taken with IRQs disabled
+ *
+ * As the ap_list_lock might be taken from the timer interrupt handler,
+ * we have to disable IRQs before taking this lock and everything lower
+ * than it.
+ *
+ * If you need to take multiple locks, always take the upper lock first,
+ * then the lower ones, e.g. first take the its_lock, then the irq_lock.
+ * If you are already holding a lock and need to take a higher one, you
+ * have to drop the lower ranking lock first and re-acquire it after having
+ * taken the upper one.
+ *
+ * When taking more than one ap_list_lock at the same time, always take the
+ * lowest numbered VCPU's ap_list_lock first, so:
+ *   vcpuX->vcpu_id < vcpuY->vcpu_id:
+ *     raw_spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
+ *     raw_spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
+ *
+ * Since the VGIC must support injecting virtual interrupts from ISRs, we have
+ * to use the raw_spin_lock_irqsave/raw_spin_unlock_irqrestore versions of outer
+ * spinlocks for any lock that may be taken while injecting an interrupt.
+ */
+
+/*
+ * Iterate over the VM's list of mapped LPIs to find the one with a
+ * matching interrupt ID and return a reference to the IRQ structure.
+ */
+static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct vgic_irq *irq = NULL;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+
+	list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
+		if (irq->intid != intid)
+			continue;
+
+		/*
+		 * This increases the refcount, the caller is expected to
+		 * call vgic_put_irq() later once it's finished with the IRQ.
+		 */
+		vgic_get_irq_kref(irq);
+		goto out_unlock;
+	}
+	irq = NULL;
+
+out_unlock:
+	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+
+	return irq;
+}
+
+/*
+ * This looks up the virtual interrupt ID to get the corresponding
+ * struct vgic_irq. It also increases the refcount, so any caller is expected
+ * to call vgic_put_irq() once it's finished with this IRQ.
+ */
+struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
+			      u32 intid)
+{
+	/* SGIs and PPIs */
+	if (intid <= VGIC_MAX_PRIVATE) {
+		intid = array_index_nospec(intid, VGIC_MAX_PRIVATE + 1);
+		return &vcpu->arch.vgic_cpu.private_irqs[intid];
+	}
+
+	/* SPIs */
+	if (intid < (kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {
+		intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);
+		return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
+	}
+
+	/* LPIs */
+	if (intid >= VGIC_MIN_LPI)
+		return vgic_get_lpi(kvm, intid);
+
+	return NULL;
+}
+
+/*
+ * We can't do anything in here, because we lack the kvm pointer to
+ * lock and remove the item from the lpi_list. So we keep this function
+ * empty and use the return value of kref_put() to trigger the freeing.
+ */
+static void vgic_irq_release(struct kref *ref)
+{
+}
+
+/*
+ * Drop the refcount on the LPI. Must be called with lpi_list_lock held.
+ */
+void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+
+	if (!kref_put(&irq->refcount, vgic_irq_release))
+		return;
+
+	list_del(&irq->lpi_list);
+	dist->lpi_list_count--;
+
+	kfree(irq);
+}
+
+void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	unsigned long flags;
+
+	if (irq->intid < VGIC_MIN_LPI)
+		return;
+
+	raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
+	__vgic_put_lpi_locked(kvm, irq);
+	raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
+}
+
+void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_irq *irq, *tmp;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
+
+	list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
+		if (irq->intid >= VGIC_MIN_LPI) {
+			raw_spin_lock(&irq->irq_lock);
+			list_del(&irq->ap_list);
+			irq->vcpu = NULL;
+			raw_spin_unlock(&irq->irq_lock);
+			vgic_put_irq(vcpu->kvm, irq);
+		}
+	}
+
+	raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
+}
+
+void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending)
+{
+	WARN_ON(irq_set_irqchip_state(irq->host_irq,
+				      IRQCHIP_STATE_PENDING,
+				      pending));
+}
+
+bool vgic_get_phys_line_level(struct vgic_irq *irq)
+{
+	bool line_level;
+
+	BUG_ON(!irq->hw);
+
+	if (irq->ops && irq->ops->get_input_level)
+		return irq->ops->get_input_level(irq->intid);
+
+	WARN_ON(irq_get_irqchip_state(irq->host_irq,
+				      IRQCHIP_STATE_PENDING,
+				      &line_level));
+	return line_level;
+}
+
+/* Set/Clear the physical active state */
+void vgic_irq_set_phys_active(struct vgic_irq *irq, bool active)
+{
+
+	BUG_ON(!irq->hw);
+	WARN_ON(irq_set_irqchip_state(irq->host_irq,
+				      IRQCHIP_STATE_ACTIVE,
+				      active));
+}
+
+/**
+ * kvm_vgic_target_oracle - compute the target vcpu for an irq
+ *
+ * @irq:	The irq to route. Must be already locked.
+ *
+ * Based on the current state of the interrupt (enabled, pending,
+ * active, vcpu and target_vcpu), compute the next vcpu this should be
+ * given to. Return NULL if this shouldn't be injected at all.
+ *
+ * Requires the IRQ lock to be held.
+ */
+static struct kvm_vcpu *vgic_target_oracle(struct vgic_irq *irq)
+{
+	lockdep_assert_held(&irq->irq_lock);
+
+	/* If the interrupt is active, it must stay on the current vcpu */
+	if (irq->active)
+		return irq->vcpu ? : irq->target_vcpu;
+
+	/*
+	 * If the IRQ is not active but enabled and pending, we should direct
+	 * it to its configured target VCPU.
+	 * If the distributor is disabled, pending interrupts shouldn't be
+	 * forwarded.
+	 */
+	if (irq->enabled && irq_is_pending(irq)) {
+		if (unlikely(irq->target_vcpu &&
+			     !irq->target_vcpu->kvm->arch.vgic.enabled))
+			return NULL;
+
+		return irq->target_vcpu;
+	}
+
+	/* If neither active nor pending and enabled, then this IRQ should not
+	 * be queued to any VCPU.
+	 */
+	return NULL;
+}
+
+/*
+ * The order of items in the ap_lists defines how we'll pack things in LRs as
+ * well, the first items in the list being the first things populated in the
+ * LRs.
+ *
+ * A hard rule is that active interrupts can never be pushed out of the LRs
+ * (and therefore take priority) since we cannot reliably trap on deactivation
+ * of IRQs and therefore they have to be present in the LRs.
+ *
+ * Otherwise things should be sorted by the priority field and the GIC
+ * hardware support will take care of preemption of priority groups etc.
+ *
+ * Return negative if "a" sorts before "b", 0 to preserve order, and positive
+ * to sort "b" before "a".
+ */
+static int vgic_irq_cmp(void *priv, const struct list_head *a,
+			const struct list_head *b)
+{
+	struct vgic_irq *irqa = container_of(a, struct vgic_irq, ap_list);
+	struct vgic_irq *irqb = container_of(b, struct vgic_irq, ap_list);
+	bool penda, pendb;
+	int ret;
+
+	/*
+	 * list_sort may call this function with the same element when
+	 * the list is fairly long.
+	 */
+	if (unlikely(irqa == irqb))
+		return 0;
+
+	raw_spin_lock(&irqa->irq_lock);
+	raw_spin_lock_nested(&irqb->irq_lock, SINGLE_DEPTH_NESTING);
+
+	if (irqa->active || irqb->active) {
+		ret = (int)irqb->active - (int)irqa->active;
+		goto out;
+	}
+
+	penda = irqa->enabled && irq_is_pending(irqa);
+	pendb = irqb->enabled && irq_is_pending(irqb);
+
+	if (!penda || !pendb) {
+		ret = (int)pendb - (int)penda;
+		goto out;
+	}
+
+	/* Both pending and enabled, sort by priority */
+	ret = irqa->priority - irqb->priority;
+out:
+	raw_spin_unlock(&irqb->irq_lock);
+	raw_spin_unlock(&irqa->irq_lock);
+	return ret;
+}
+
+/* Must be called with the ap_list_lock held */
+static void vgic_sort_ap_list(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+	lockdep_assert_held(&vgic_cpu->ap_list_lock);
+
+	list_sort(NULL, &vgic_cpu->ap_list_head, vgic_irq_cmp);
+}
+
+/*
+ * Only valid injection if changing level for level-triggered IRQs or for a
+ * rising edge, and in-kernel connected IRQ lines can only be controlled by
+ * their owner.
+ */
+static bool vgic_validate_injection(struct vgic_irq *irq, bool level, void *owner)
+{
+	if (irq->owner != owner)
+		return false;
+
+	switch (irq->config) {
+	case VGIC_CONFIG_LEVEL:
+		return irq->line_level != level;
+	case VGIC_CONFIG_EDGE:
+		return level;
+	}
+
+	return false;
+}
+
+/*
+ * Check whether an IRQ needs to (and can) be queued to a VCPU's ap list.
+ * Do the queuing if necessary, taking the right locks in the right order.
+ * Returns true when the IRQ was queued, false otherwise.
+ *
+ * Needs to be entered with the IRQ lock already held, but will return
+ * with all locks dropped.
+ */
+bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
+			   unsigned long flags)
+{
+	struct kvm_vcpu *vcpu;
+
+	lockdep_assert_held(&irq->irq_lock);
+
+retry:
+	vcpu = vgic_target_oracle(irq);
+	if (irq->vcpu || !vcpu) {
+		/*
+		 * If this IRQ is already on a VCPU's ap_list, then it
+		 * cannot be moved or modified and there is no more work for
+		 * us to do.
+		 *
+		 * Otherwise, if the irq is not pending and enabled, it does
+		 * not need to be inserted into an ap_list and there is also
+		 * no more work for us to do.
+		 */
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+		/*
+		 * We have to kick the VCPU here, because we could be
+		 * queueing an edge-triggered interrupt for which we
+		 * get no EOI maintenance interrupt. In that case,
+		 * while the IRQ is already on the VCPU's AP list, the
+		 * VCPU could have EOI'ed the original interrupt and
+		 * won't see this one until it exits for some other
+		 * reason.
+		 */
+		if (vcpu) {
+			kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
+			kvm_vcpu_kick(vcpu);
+		}
+		return false;
+	}
+
+	/*
+	 * We must unlock the irq lock to take the ap_list_lock where
+	 * we are going to insert this new pending interrupt.
+	 */
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+	/* someone can do stuff here, which we re-check below */
+
+	raw_spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+	raw_spin_lock(&irq->irq_lock);
+
+	/*
+	 * Did something change behind our backs?
+	 *
+	 * There are two cases:
+	 * 1) The irq lost its pending state or was disabled behind our
+	 *    backs and/or it was queued to another VCPU's ap_list.
+	 * 2) Someone changed the affinity on this irq behind our
+	 *    backs and we are now holding the wrong ap_list_lock.
+	 *
+	 * In both cases, drop the locks and retry.
+	 */
+
+	if (unlikely(irq->vcpu || vcpu != vgic_target_oracle(irq))) {
+		raw_spin_unlock(&irq->irq_lock);
+		raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock,
+					   flags);
+
+		raw_spin_lock_irqsave(&irq->irq_lock, flags);
+		goto retry;
+	}
+
+	/*
+	 * Grab a reference to the irq to reflect the fact that it is
+	 * now in the ap_list.
+	 */
+	vgic_get_irq_kref(irq);
+	list_add_tail(&irq->ap_list, &vcpu->arch.vgic_cpu.ap_list_head);
+	irq->vcpu = vcpu;
+
+	raw_spin_unlock(&irq->irq_lock);
+	raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+
+	kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
+	kvm_vcpu_kick(vcpu);
+
+	return true;
+}
+
+/**
+ * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
+ * @kvm:     The VM structure pointer
+ * @cpuid:   The CPU for PPIs
+ * @intid:   The INTID to inject a new state to.
+ * @level:   Edge-triggered:  true:  to trigger the interrupt
+ *			      false: to ignore the call
+ *	     Level-sensitive  true:  raise the input signal
+ *			      false: lower the input signal
+ * @owner:   The opaque pointer to the owner of the IRQ being raised to verify
+ *           that the caller is allowed to inject this IRQ.  Userspace
+ *           injections will have owner == NULL.
+ *
+ * The VGIC is not concerned with devices being active-LOW or active-HIGH for
+ * level-sensitive interrupts.  You can think of the level parameter as 1
+ * being HIGH and 0 being LOW and all devices being active-HIGH.
+ */
+int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
+			bool level, void *owner)
+{
+	struct kvm_vcpu *vcpu;
+	struct vgic_irq *irq;
+	unsigned long flags;
+	int ret;
+
+	trace_vgic_update_irq_pending(cpuid, intid, level);
+
+	ret = vgic_lazy_init(kvm);
+	if (ret)
+		return ret;
+
+	vcpu = kvm_get_vcpu(kvm, cpuid);
+	if (!vcpu && intid < VGIC_NR_PRIVATE_IRQS)
+		return -EINVAL;
+
+	irq = vgic_get_irq(kvm, vcpu, intid);
+	if (!irq)
+		return -EINVAL;
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+
+	if (!vgic_validate_injection(irq, level, owner)) {
+		/* Nothing to see here, move along... */
+		raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+		vgic_put_irq(kvm, irq);
+		return 0;
+	}
+
+	if (irq->config == VGIC_CONFIG_LEVEL)
+		irq->line_level = level;
+	else
+		irq->pending_latch = true;
+
+	vgic_queue_irq_unlock(kvm, irq, flags);
+	vgic_put_irq(kvm, irq);
+
+	return 0;
+}
+
+/* @irq->irq_lock must be held */
+static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
+			    unsigned int host_irq,
+			    struct irq_ops *ops)
+{
+	struct irq_desc *desc;
+	struct irq_data *data;
+
+	/*
+	 * Find the physical IRQ number corresponding to @host_irq
+	 */
+	desc = irq_to_desc(host_irq);
+	if (!desc) {
+		kvm_err("%s: no interrupt descriptor\n", __func__);
+		return -EINVAL;
+	}
+	data = irq_desc_get_irq_data(desc);
+	while (data->parent_data)
+		data = data->parent_data;
+
+	irq->hw = true;
+	irq->host_irq = host_irq;
+	irq->hwintid = data->hwirq;
+	irq->ops = ops;
+	return 0;
+}
+
+/* @irq->irq_lock must be held */
+static inline void kvm_vgic_unmap_irq(struct vgic_irq *irq)
+{
+	irq->hw = false;
+	irq->hwintid = 0;
+	irq->ops = NULL;
+}
+
+int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
+			  u32 vintid, struct irq_ops *ops)
+{
+	struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
+	unsigned long flags;
+	int ret;
+
+	BUG_ON(!irq);
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	ret = kvm_vgic_map_irq(vcpu, irq, host_irq, ops);
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+	vgic_put_irq(vcpu->kvm, irq);
+
+	return ret;
+}
+
+/**
+ * kvm_vgic_reset_mapped_irq - Reset a mapped IRQ
+ * @vcpu: The VCPU pointer
+ * @vintid: The INTID of the interrupt
+ *
+ * Reset the active and pending states of a mapped interrupt.  Kernel
+ * subsystems injecting mapped interrupts should reset their interrupt lines
+ * when we are doing a reset of the VM.
+ */
+void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid)
+{
+	struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
+	unsigned long flags;
+
+	if (!irq->hw)
+		goto out;
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	irq->active = false;
+	irq->pending_latch = false;
+	irq->line_level = false;
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+out:
+	vgic_put_irq(vcpu->kvm, irq);
+}
+
+int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid)
+{
+	struct vgic_irq *irq;
+	unsigned long flags;
+
+	if (!vgic_initialized(vcpu->kvm))
+		return -EAGAIN;
+
+	irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
+	BUG_ON(!irq);
+
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	kvm_vgic_unmap_irq(irq);
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+	vgic_put_irq(vcpu->kvm, irq);
+
+	return 0;
+}
+
+/**
+ * kvm_vgic_set_owner - Set the owner of an interrupt for a VM
+ *
+ * @vcpu:   Pointer to the VCPU (used for PPIs)
+ * @intid:  The virtual INTID identifying the interrupt (PPI or SPI)
+ * @owner:  Opaque pointer to the owner
+ *
+ * Returns 0 if intid is not already used by another in-kernel device and the
+ * owner is set, otherwise returns an error code.
+ */
+int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner)
+{
+	struct vgic_irq *irq;
+	unsigned long flags;
+	int ret = 0;
+
+	if (!vgic_initialized(vcpu->kvm))
+		return -EAGAIN;
+
+	/* SGIs and LPIs cannot be wired up to any device */
+	if (!irq_is_ppi(intid) && !vgic_valid_spi(vcpu->kvm, intid))
+		return -EINVAL;
+
+	irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	if (irq->owner && irq->owner != owner)
+		ret = -EEXIST;
+	else
+		irq->owner = owner;
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+
+	return ret;
+}
+
+/**
+ * vgic_prune_ap_list - Remove non-relevant interrupts from the list
+ *
+ * @vcpu: The VCPU pointer
+ *
+ * Go over the list of "interesting" interrupts, and prune those that we
+ * won't have to consider in the near future.
+ */
+static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_irq *irq, *tmp;
+
+	DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
+
+retry:
+	raw_spin_lock(&vgic_cpu->ap_list_lock);
+
+	list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
+		struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB;
+		bool target_vcpu_needs_kick = false;
+
+		raw_spin_lock(&irq->irq_lock);
+
+		BUG_ON(vcpu != irq->vcpu);
+
+		target_vcpu = vgic_target_oracle(irq);
+
+		if (!target_vcpu) {
+			/*
+			 * We don't need to process this interrupt any
+			 * further, move it off the list.
+			 */
+			list_del(&irq->ap_list);
+			irq->vcpu = NULL;
+			raw_spin_unlock(&irq->irq_lock);
+
+			/*
+			 * This vgic_put_irq call matches the
+			 * vgic_get_irq_kref in vgic_queue_irq_unlock,
+			 * where we added the LPI to the ap_list. As
+			 * we remove the irq from the list, we drop
+			 * also drop the refcount.
+			 */
+			vgic_put_irq(vcpu->kvm, irq);
+			continue;
+		}
+
+		if (target_vcpu == vcpu) {
+			/* We're on the right CPU */
+			raw_spin_unlock(&irq->irq_lock);
+			continue;
+		}
+
+		/* This interrupt looks like it has to be migrated. */
+
+		raw_spin_unlock(&irq->irq_lock);
+		raw_spin_unlock(&vgic_cpu->ap_list_lock);
+
+		/*
+		 * Ensure locking order by always locking the smallest
+		 * ID first.
+		 */
+		if (vcpu->vcpu_id < target_vcpu->vcpu_id) {
+			vcpuA = vcpu;
+			vcpuB = target_vcpu;
+		} else {
+			vcpuA = target_vcpu;
+			vcpuB = vcpu;
+		}
+
+		raw_spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
+		raw_spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
+				      SINGLE_DEPTH_NESTING);
+		raw_spin_lock(&irq->irq_lock);
+
+		/*
+		 * If the affinity has been preserved, move the
+		 * interrupt around. Otherwise, it means things have
+		 * changed while the interrupt was unlocked, and we
+		 * need to replay this.
+		 *
+		 * In all cases, we cannot trust the list not to have
+		 * changed, so we restart from the beginning.
+		 */
+		if (target_vcpu == vgic_target_oracle(irq)) {
+			struct vgic_cpu *new_cpu = &target_vcpu->arch.vgic_cpu;
+
+			list_del(&irq->ap_list);
+			irq->vcpu = target_vcpu;
+			list_add_tail(&irq->ap_list, &new_cpu->ap_list_head);
+			target_vcpu_needs_kick = true;
+		}
+
+		raw_spin_unlock(&irq->irq_lock);
+		raw_spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
+		raw_spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
+
+		if (target_vcpu_needs_kick) {
+			kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu);
+			kvm_vcpu_kick(target_vcpu);
+		}
+
+		goto retry;
+	}
+
+	raw_spin_unlock(&vgic_cpu->ap_list_lock);
+}
+
+static inline void vgic_fold_lr_state(struct kvm_vcpu *vcpu)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_fold_lr_state(vcpu);
+	else
+		vgic_v3_fold_lr_state(vcpu);
+}
+
+/* Requires the irq_lock to be held. */
+static inline void vgic_populate_lr(struct kvm_vcpu *vcpu,
+				    struct vgic_irq *irq, int lr)
+{
+	lockdep_assert_held(&irq->irq_lock);
+
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_populate_lr(vcpu, irq, lr);
+	else
+		vgic_v3_populate_lr(vcpu, irq, lr);
+}
+
+static inline void vgic_clear_lr(struct kvm_vcpu *vcpu, int lr)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_clear_lr(vcpu, lr);
+	else
+		vgic_v3_clear_lr(vcpu, lr);
+}
+
+static inline void vgic_set_underflow(struct kvm_vcpu *vcpu)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_set_underflow(vcpu);
+	else
+		vgic_v3_set_underflow(vcpu);
+}
+
+/* Requires the ap_list_lock to be held. */
+static int compute_ap_list_depth(struct kvm_vcpu *vcpu,
+				 bool *multi_sgi)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_irq *irq;
+	int count = 0;
+
+	*multi_sgi = false;
+
+	lockdep_assert_held(&vgic_cpu->ap_list_lock);
+
+	list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
+		int w;
+
+		raw_spin_lock(&irq->irq_lock);
+		/* GICv2 SGIs can count for more than one... */
+		w = vgic_irq_get_lr_count(irq);
+		raw_spin_unlock(&irq->irq_lock);
+
+		count += w;
+		*multi_sgi |= (w > 1);
+	}
+	return count;
+}
+
+/* Requires the VCPU's ap_list_lock to be held. */
+static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_irq *irq;
+	int count;
+	bool multi_sgi;
+	u8 prio = 0xff;
+	int i = 0;
+
+	lockdep_assert_held(&vgic_cpu->ap_list_lock);
+
+	count = compute_ap_list_depth(vcpu, &multi_sgi);
+	if (count > kvm_vgic_global_state.nr_lr || multi_sgi)
+		vgic_sort_ap_list(vcpu);
+
+	count = 0;
+
+	list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
+		raw_spin_lock(&irq->irq_lock);
+
+		/*
+		 * If we have multi-SGIs in the pipeline, we need to
+		 * guarantee that they are all seen before any IRQ of
+		 * lower priority. In that case, we need to filter out
+		 * these interrupts by exiting early. This is easy as
+		 * the AP list has been sorted already.
+		 */
+		if (multi_sgi && irq->priority > prio) {
+			_raw_spin_unlock(&irq->irq_lock);
+			break;
+		}
+
+		if (likely(vgic_target_oracle(irq) == vcpu)) {
+			vgic_populate_lr(vcpu, irq, count++);
+
+			if (irq->source)
+				prio = irq->priority;
+		}
+
+		raw_spin_unlock(&irq->irq_lock);
+
+		if (count == kvm_vgic_global_state.nr_lr) {
+			if (!list_is_last(&irq->ap_list,
+					  &vgic_cpu->ap_list_head))
+				vgic_set_underflow(vcpu);
+			break;
+		}
+	}
+
+	/* Nuke remaining LRs */
+	for (i = count ; i < kvm_vgic_global_state.nr_lr; i++)
+		vgic_clear_lr(vcpu, i);
+
+	if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
+		vcpu->arch.vgic_cpu.vgic_v2.used_lrs = count;
+	else
+		vcpu->arch.vgic_cpu.vgic_v3.used_lrs = count;
+}
+
+static inline bool can_access_vgic_from_kernel(void)
+{
+	/*
+	 * GICv2 can always be accessed from the kernel because it is
+	 * memory-mapped, and VHE systems can access GICv3 EL2 system
+	 * registers.
+	 */
+	return !static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif) || has_vhe();
+}
+
+static inline void vgic_save_state(struct kvm_vcpu *vcpu)
+{
+	if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
+		vgic_v2_save_state(vcpu);
+	else
+		__vgic_v3_save_state(&vcpu->arch.vgic_cpu.vgic_v3);
+}
+
+/* Sync back the hardware VGIC state into our emulation after a guest's run. */
+void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
+{
+	int used_lrs;
+
+	/* An empty ap_list_head implies used_lrs == 0 */
+	if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head))
+		return;
+
+	if (can_access_vgic_from_kernel())
+		vgic_save_state(vcpu);
+
+	if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
+		used_lrs = vcpu->arch.vgic_cpu.vgic_v2.used_lrs;
+	else
+		used_lrs = vcpu->arch.vgic_cpu.vgic_v3.used_lrs;
+
+	if (used_lrs)
+		vgic_fold_lr_state(vcpu);
+	vgic_prune_ap_list(vcpu);
+}
+
+static inline void vgic_restore_state(struct kvm_vcpu *vcpu)
+{
+	if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
+		vgic_v2_restore_state(vcpu);
+	else
+		__vgic_v3_restore_state(&vcpu->arch.vgic_cpu.vgic_v3);
+}
+
+/* Flush our emulation state into the GIC hardware before entering the guest. */
+void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * If there are no virtual interrupts active or pending for this
+	 * VCPU, then there is no work to do and we can bail out without
+	 * taking any lock.  There is a potential race with someone injecting
+	 * interrupts to the VCPU, but it is a benign race as the VCPU will
+	 * either observe the new interrupt before or after doing this check,
+	 * and introducing additional synchronization mechanism doesn't change
+	 * this.
+	 *
+	 * Note that we still need to go through the whole thing if anything
+	 * can be directly injected (GICv4).
+	 */
+	if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head) &&
+	    !vgic_supports_direct_msis(vcpu->kvm))
+		return;
+
+	DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
+
+	if (!list_empty(&vcpu->arch.vgic_cpu.ap_list_head)) {
+		raw_spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
+		vgic_flush_lr_state(vcpu);
+		raw_spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
+	}
+
+	if (can_access_vgic_from_kernel())
+		vgic_restore_state(vcpu);
+
+	if (vgic_supports_direct_msis(vcpu->kvm))
+		vgic_v4_commit(vcpu);
+}
+
+void kvm_vgic_load(struct kvm_vcpu *vcpu)
+{
+	if (unlikely(!vgic_initialized(vcpu->kvm)))
+		return;
+
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_load(vcpu);
+	else
+		vgic_v3_load(vcpu);
+}
+
+void kvm_vgic_put(struct kvm_vcpu *vcpu)
+{
+	if (unlikely(!vgic_initialized(vcpu->kvm)))
+		return;
+
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_put(vcpu);
+	else
+		vgic_v3_put(vcpu);
+}
+
+void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu)
+{
+	if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
+		return;
+
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_vmcr_sync(vcpu);
+	else
+		vgic_v3_vmcr_sync(vcpu);
+}
+
+int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_irq *irq;
+	bool pending = false;
+	unsigned long flags;
+	struct vgic_vmcr vmcr;
+
+	if (!vcpu->kvm->arch.vgic.enabled)
+		return false;
+
+	if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last)
+		return true;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+
+	raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
+
+	list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
+		raw_spin_lock(&irq->irq_lock);
+		pending = irq_is_pending(irq) && irq->enabled &&
+			  !irq->active &&
+			  irq->priority < vmcr.pmr;
+		raw_spin_unlock(&irq->irq_lock);
+
+		if (pending)
+			break;
+	}
+
+	raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
+
+	return pending;
+}
+
+void vgic_kick_vcpus(struct kvm *kvm)
+{
+	struct kvm_vcpu *vcpu;
+	unsigned long c;
+
+	/*
+	 * We've injected an interrupt, time to find out who deserves
+	 * a good kick...
+	 */
+	kvm_for_each_vcpu(c, vcpu, kvm) {
+		if (kvm_vgic_vcpu_pending_irq(vcpu)) {
+			kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
+			kvm_vcpu_kick(vcpu);
+		}
+	}
+}
+
+bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid)
+{
+	struct vgic_irq *irq;
+	bool map_is_active;
+	unsigned long flags;
+
+	if (!vgic_initialized(vcpu->kvm))
+		return false;
+
+	irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
+	raw_spin_lock_irqsave(&irq->irq_lock, flags);
+	map_is_active = irq->hw && irq->active;
+	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
+	vgic_put_irq(vcpu->kvm, irq);
+
+	return map_is_active;
+}
+
+/*
+ * Level-triggered mapped IRQs are special because we only observe rising
+ * edges as input to the VGIC.
+ *
+ * If the guest never acked the interrupt we have to sample the physical
+ * line and set the line level, because the device state could have changed
+ * or we simply need to process the still pending interrupt later.
+ *
+ * We could also have entered the guest with the interrupt active+pending.
+ * On the next exit, we need to re-evaluate the pending state, as it could
+ * otherwise result in a spurious interrupt by injecting a now potentially
+ * stale pending state.
+ *
+ * If this causes us to lower the level, we have to also clear the physical
+ * active state, since we will otherwise never be told when the interrupt
+ * becomes asserted again.
+ *
+ * Another case is when the interrupt requires a helping hand on
+ * deactivation (no HW deactivation, for example).
+ */
+void vgic_irq_handle_resampling(struct vgic_irq *irq,
+				bool lr_deactivated, bool lr_pending)
+{
+	if (vgic_irq_is_mapped_level(irq)) {
+		bool resample = false;
+
+		if (unlikely(vgic_irq_needs_resampling(irq))) {
+			resample = !(irq->active || irq->pending_latch);
+		} else if (lr_pending || (lr_deactivated && irq->line_level)) {
+			irq->line_level = vgic_get_phys_line_level(irq);
+			resample = !irq->line_level;
+		}
+
+		if (resample)
+			vgic_irq_set_phys_active(irq, false);
+	}
+}
diff --git a/arch/arm64/kvm/vgic/vgic.h b/arch/arm64/kvm/vgic/vgic.h
new file mode 100644
index 000000000..9f80a580c
--- /dev/null
+++ b/arch/arm64/kvm/vgic/vgic.h
@@ -0,0 +1,337 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015, 2016 ARM Ltd.
+ */
+#ifndef __KVM_ARM_VGIC_NEW_H__
+#define __KVM_ARM_VGIC_NEW_H__
+
+#include <linux/irqchip/arm-gic-common.h>
+
+#define PRODUCT_ID_KVM		0x4b	/* ASCII code K */
+#define IMPLEMENTER_ARM		0x43b
+
+#define VGIC_ADDR_UNDEF		(-1)
+#define IS_VGIC_ADDR_UNDEF(_x)  ((_x) == VGIC_ADDR_UNDEF)
+
+#define INTERRUPT_ID_BITS_SPIS	10
+#define INTERRUPT_ID_BITS_ITS	16
+#define VGIC_PRI_BITS		5
+
+#define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS)
+
+#define VGIC_AFFINITY_0_SHIFT 0
+#define VGIC_AFFINITY_0_MASK (0xffUL << VGIC_AFFINITY_0_SHIFT)
+#define VGIC_AFFINITY_1_SHIFT 8
+#define VGIC_AFFINITY_1_MASK (0xffUL << VGIC_AFFINITY_1_SHIFT)
+#define VGIC_AFFINITY_2_SHIFT 16
+#define VGIC_AFFINITY_2_MASK (0xffUL << VGIC_AFFINITY_2_SHIFT)
+#define VGIC_AFFINITY_3_SHIFT 24
+#define VGIC_AFFINITY_3_MASK (0xffUL << VGIC_AFFINITY_3_SHIFT)
+
+#define VGIC_AFFINITY_LEVEL(reg, level) \
+	((((reg) & VGIC_AFFINITY_## level ##_MASK) \
+	>> VGIC_AFFINITY_## level ##_SHIFT) << MPIDR_LEVEL_SHIFT(level))
+
+/*
+ * The Userspace encodes the affinity differently from the MPIDR,
+ * Below macro converts vgic userspace format to MPIDR reg format.
+ */
+#define VGIC_TO_MPIDR(val) (VGIC_AFFINITY_LEVEL(val, 0) | \
+			    VGIC_AFFINITY_LEVEL(val, 1) | \
+			    VGIC_AFFINITY_LEVEL(val, 2) | \
+			    VGIC_AFFINITY_LEVEL(val, 3))
+
+/*
+ * As per Documentation/virt/kvm/devices/arm-vgic-v3.rst,
+ * below macros are defined for CPUREG encoding.
+ */
+#define KVM_REG_ARM_VGIC_SYSREG_OP0_MASK   0x000000000000c000
+#define KVM_REG_ARM_VGIC_SYSREG_OP0_SHIFT  14
+#define KVM_REG_ARM_VGIC_SYSREG_OP1_MASK   0x0000000000003800
+#define KVM_REG_ARM_VGIC_SYSREG_OP1_SHIFT  11
+#define KVM_REG_ARM_VGIC_SYSREG_CRN_MASK   0x0000000000000780
+#define KVM_REG_ARM_VGIC_SYSREG_CRN_SHIFT  7
+#define KVM_REG_ARM_VGIC_SYSREG_CRM_MASK   0x0000000000000078
+#define KVM_REG_ARM_VGIC_SYSREG_CRM_SHIFT  3
+#define KVM_REG_ARM_VGIC_SYSREG_OP2_MASK   0x0000000000000007
+#define KVM_REG_ARM_VGIC_SYSREG_OP2_SHIFT  0
+
+#define KVM_DEV_ARM_VGIC_SYSREG_MASK (KVM_REG_ARM_VGIC_SYSREG_OP0_MASK | \
+				      KVM_REG_ARM_VGIC_SYSREG_OP1_MASK | \
+				      KVM_REG_ARM_VGIC_SYSREG_CRN_MASK | \
+				      KVM_REG_ARM_VGIC_SYSREG_CRM_MASK | \
+				      KVM_REG_ARM_VGIC_SYSREG_OP2_MASK)
+
+/*
+ * As per Documentation/virt/kvm/devices/arm-vgic-its.rst,
+ * below macros are defined for ITS table entry encoding.
+ */
+#define KVM_ITS_CTE_VALID_SHIFT		63
+#define KVM_ITS_CTE_VALID_MASK		BIT_ULL(63)
+#define KVM_ITS_CTE_RDBASE_SHIFT	16
+#define KVM_ITS_CTE_ICID_MASK		GENMASK_ULL(15, 0)
+#define KVM_ITS_ITE_NEXT_SHIFT		48
+#define KVM_ITS_ITE_PINTID_SHIFT	16
+#define KVM_ITS_ITE_PINTID_MASK		GENMASK_ULL(47, 16)
+#define KVM_ITS_ITE_ICID_MASK		GENMASK_ULL(15, 0)
+#define KVM_ITS_DTE_VALID_SHIFT		63
+#define KVM_ITS_DTE_VALID_MASK		BIT_ULL(63)
+#define KVM_ITS_DTE_NEXT_SHIFT		49
+#define KVM_ITS_DTE_NEXT_MASK		GENMASK_ULL(62, 49)
+#define KVM_ITS_DTE_ITTADDR_SHIFT	5
+#define KVM_ITS_DTE_ITTADDR_MASK	GENMASK_ULL(48, 5)
+#define KVM_ITS_DTE_SIZE_MASK		GENMASK_ULL(4, 0)
+#define KVM_ITS_L1E_VALID_MASK		BIT_ULL(63)
+/* we only support 64 kB translation table page size */
+#define KVM_ITS_L1E_ADDR_MASK		GENMASK_ULL(51, 16)
+
+#define KVM_VGIC_V3_RDIST_INDEX_MASK	GENMASK_ULL(11, 0)
+#define KVM_VGIC_V3_RDIST_FLAGS_MASK	GENMASK_ULL(15, 12)
+#define KVM_VGIC_V3_RDIST_FLAGS_SHIFT	12
+#define KVM_VGIC_V3_RDIST_BASE_MASK	GENMASK_ULL(51, 16)
+#define KVM_VGIC_V3_RDIST_COUNT_MASK	GENMASK_ULL(63, 52)
+#define KVM_VGIC_V3_RDIST_COUNT_SHIFT	52
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+#define DEBUG_SPINLOCK_BUG_ON(p) BUG_ON(p)
+#else
+#define DEBUG_SPINLOCK_BUG_ON(p)
+#endif
+
+static inline u32 vgic_get_implementation_rev(struct kvm_vcpu *vcpu)
+{
+	return vcpu->kvm->arch.vgic.implementation_rev;
+}
+
+/* Requires the irq_lock to be held by the caller. */
+static inline bool irq_is_pending(struct vgic_irq *irq)
+{
+	if (irq->config == VGIC_CONFIG_EDGE)
+		return irq->pending_latch;
+	else
+		return irq->pending_latch || irq->line_level;
+}
+
+static inline bool vgic_irq_is_mapped_level(struct vgic_irq *irq)
+{
+	return irq->config == VGIC_CONFIG_LEVEL && irq->hw;
+}
+
+static inline int vgic_irq_get_lr_count(struct vgic_irq *irq)
+{
+	/* Account for the active state as an interrupt */
+	if (vgic_irq_is_sgi(irq->intid) && irq->source)
+		return hweight8(irq->source) + irq->active;
+
+	return irq_is_pending(irq) || irq->active;
+}
+
+static inline bool vgic_irq_is_multi_sgi(struct vgic_irq *irq)
+{
+	return vgic_irq_get_lr_count(irq) > 1;
+}
+
+/*
+ * This struct provides an intermediate representation of the fields contained
+ * in the GICH_VMCR and ICH_VMCR registers, such that code exporting the GIC
+ * state to userspace can generate either GICv2 or GICv3 CPU interface
+ * registers regardless of the hardware backed GIC used.
+ */
+struct vgic_vmcr {
+	u32	grpen0;
+	u32	grpen1;
+
+	u32	ackctl;
+	u32	fiqen;
+	u32	cbpr;
+	u32	eoim;
+
+	u32	abpr;
+	u32	bpr;
+	u32	pmr;  /* Priority mask field in the GICC_PMR and
+		       * ICC_PMR_EL1 priority field format */
+};
+
+struct vgic_reg_attr {
+	struct kvm_vcpu *vcpu;
+	gpa_t addr;
+};
+
+int vgic_v3_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr,
+		       struct vgic_reg_attr *reg_attr);
+int vgic_v2_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr,
+		       struct vgic_reg_attr *reg_attr);
+const struct vgic_register_region *
+vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
+		     gpa_t addr, int len);
+struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
+			      u32 intid);
+void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq);
+void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq);
+bool vgic_get_phys_line_level(struct vgic_irq *irq);
+void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending);
+void vgic_irq_set_phys_active(struct vgic_irq *irq, bool active);
+bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
+			   unsigned long flags);
+void vgic_kick_vcpus(struct kvm *kvm);
+void vgic_irq_handle_resampling(struct vgic_irq *irq,
+				bool lr_deactivated, bool lr_pending);
+
+int vgic_check_iorange(struct kvm *kvm, phys_addr_t ioaddr,
+		       phys_addr_t addr, phys_addr_t alignment,
+		       phys_addr_t size);
+
+void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);
+void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
+void vgic_v2_clear_lr(struct kvm_vcpu *vcpu, int lr);
+void vgic_v2_set_underflow(struct kvm_vcpu *vcpu);
+void vgic_v2_set_npie(struct kvm_vcpu *vcpu);
+int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr);
+int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			 int offset, u32 *val);
+int vgic_v2_cpuif_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			  int offset, u32 *val);
+void vgic_v2_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+void vgic_v2_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+void vgic_v2_enable(struct kvm_vcpu *vcpu);
+int vgic_v2_probe(const struct gic_kvm_info *info);
+int vgic_v2_map_resources(struct kvm *kvm);
+int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
+			     enum vgic_type);
+
+void vgic_v2_init_lrs(void);
+void vgic_v2_load(struct kvm_vcpu *vcpu);
+void vgic_v2_put(struct kvm_vcpu *vcpu);
+void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu);
+
+void vgic_v2_save_state(struct kvm_vcpu *vcpu);
+void vgic_v2_restore_state(struct kvm_vcpu *vcpu);
+
+static inline void vgic_get_irq_kref(struct vgic_irq *irq)
+{
+	if (irq->intid < VGIC_MIN_LPI)
+		return;
+
+	kref_get(&irq->refcount);
+}
+
+void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu);
+void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
+void vgic_v3_clear_lr(struct kvm_vcpu *vcpu, int lr);
+void vgic_v3_set_underflow(struct kvm_vcpu *vcpu);
+void vgic_v3_set_npie(struct kvm_vcpu *vcpu);
+void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+void vgic_v3_enable(struct kvm_vcpu *vcpu);
+int vgic_v3_probe(const struct gic_kvm_info *info);
+int vgic_v3_map_resources(struct kvm *kvm);
+int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq);
+int vgic_v3_save_pending_tables(struct kvm *kvm);
+int vgic_v3_set_redist_base(struct kvm *kvm, u32 index, u64 addr, u32 count);
+int vgic_register_redist_iodev(struct kvm_vcpu *vcpu);
+void vgic_unregister_redist_iodev(struct kvm_vcpu *vcpu);
+bool vgic_v3_check_base(struct kvm *kvm);
+
+void vgic_v3_load(struct kvm_vcpu *vcpu);
+void vgic_v3_put(struct kvm_vcpu *vcpu);
+void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu);
+
+bool vgic_has_its(struct kvm *kvm);
+int kvm_vgic_register_its_device(void);
+void vgic_enable_lpis(struct kvm_vcpu *vcpu);
+void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu);
+int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi);
+int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr);
+int vgic_v3_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			 int offset, u32 *val);
+int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			 int offset, u32 *val);
+int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu,
+				struct kvm_device_attr *attr, bool is_write);
+int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
+int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+				    u32 intid, u32 *val);
+int kvm_register_vgic_device(unsigned long type);
+void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+int vgic_lazy_init(struct kvm *kvm);
+int vgic_init(struct kvm *kvm);
+
+void vgic_debug_init(struct kvm *kvm);
+void vgic_debug_destroy(struct kvm *kvm);
+
+bool lock_all_vcpus(struct kvm *kvm);
+void unlock_all_vcpus(struct kvm *kvm);
+
+static inline int vgic_v3_max_apr_idx(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *cpu_if = &vcpu->arch.vgic_cpu;
+
+	/*
+	 * num_pri_bits are initialized with HW supported values.
+	 * We can rely safely on num_pri_bits even if VM has not
+	 * restored ICC_CTLR_EL1 before restoring APnR registers.
+	 */
+	switch (cpu_if->num_pri_bits) {
+	case 7: return 3;
+	case 6: return 1;
+	default: return 0;
+	}
+}
+
+static inline bool
+vgic_v3_redist_region_full(struct vgic_redist_region *region)
+{
+	if (!region->count)
+		return false;
+
+	return (region->free_index >= region->count);
+}
+
+struct vgic_redist_region *vgic_v3_rdist_free_slot(struct list_head *rdregs);
+
+static inline size_t
+vgic_v3_rd_region_size(struct kvm *kvm, struct vgic_redist_region *rdreg)
+{
+	if (!rdreg->count)
+		return atomic_read(&kvm->online_vcpus) * KVM_VGIC_V3_REDIST_SIZE;
+	else
+		return rdreg->count * KVM_VGIC_V3_REDIST_SIZE;
+}
+
+struct vgic_redist_region *vgic_v3_rdist_region_from_index(struct kvm *kvm,
+							   u32 index);
+void vgic_v3_free_redist_region(struct vgic_redist_region *rdreg);
+
+bool vgic_v3_rdist_overlap(struct kvm *kvm, gpa_t base, size_t size);
+
+static inline bool vgic_dist_overlap(struct kvm *kvm, gpa_t base, size_t size)
+{
+	struct vgic_dist *d = &kvm->arch.vgic;
+
+	return (base + size > d->vgic_dist_base) &&
+		(base < d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE);
+}
+
+bool vgic_lpis_enabled(struct kvm_vcpu *vcpu);
+int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr);
+int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
+			 u32 devid, u32 eventid, struct vgic_irq **irq);
+struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
+int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi);
+void vgic_lpi_translation_cache_init(struct kvm *kvm);
+void vgic_lpi_translation_cache_destroy(struct kvm *kvm);
+void vgic_its_invalidate_cache(struct kvm *kvm);
+
+/* GICv4.1 MMIO interface */
+int vgic_its_inv_lpi(struct kvm *kvm, struct vgic_irq *irq);
+int vgic_its_invall(struct kvm_vcpu *vcpu);
+
+bool vgic_supports_direct_msis(struct kvm *kvm);
+int vgic_v4_init(struct kvm *kvm);
+void vgic_v4_teardown(struct kvm *kvm);
+void vgic_v4_configure_vsgis(struct kvm *kvm);
+void vgic_v4_get_vlpi_state(struct vgic_irq *irq, bool *val);
+int vgic_v4_request_vpe_irq(struct kvm_vcpu *vcpu, int irq);
+
+#endif
diff --git a/arch/arm64/kvm/vmid.c b/arch/arm64/kvm/vmid.c
new file mode 100644
index 000000000..d78ae63d7
--- /dev/null
+++ b/arch/arm64/kvm/vmid.c
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VMID allocator.
+ *
+ * Based on Arm64 ASID allocator algorithm.
+ * Please refer arch/arm64/mm/context.c for detailed
+ * comments on algorithm.
+ *
+ * Copyright (C) 2002-2003 Deep Blue Solutions Ltd, all rights reserved.
+ * Copyright (C) 2012 ARM Ltd.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmu.h>
+
+unsigned int kvm_arm_vmid_bits;
+static DEFINE_RAW_SPINLOCK(cpu_vmid_lock);
+
+static atomic64_t vmid_generation;
+static unsigned long *vmid_map;
+
+static DEFINE_PER_CPU(atomic64_t, active_vmids);
+static DEFINE_PER_CPU(u64, reserved_vmids);
+
+#define VMID_MASK		(~GENMASK(kvm_arm_vmid_bits - 1, 0))
+#define VMID_FIRST_VERSION	(1UL << kvm_arm_vmid_bits)
+
+#define NUM_USER_VMIDS		VMID_FIRST_VERSION
+#define vmid2idx(vmid)		((vmid) & ~VMID_MASK)
+#define idx2vmid(idx)		vmid2idx(idx)
+
+/*
+ * As vmid #0 is always reserved, we will never allocate one
+ * as below and can be treated as invalid. This is used to
+ * set the active_vmids on vCPU schedule out.
+ */
+#define VMID_ACTIVE_INVALID		VMID_FIRST_VERSION
+
+#define vmid_gen_match(vmid) \
+	(!(((vmid) ^ atomic64_read(&vmid_generation)) >> kvm_arm_vmid_bits))
+
+static void flush_context(void)
+{
+	int cpu;
+	u64 vmid;
+
+	bitmap_clear(vmid_map, 0, NUM_USER_VMIDS);
+
+	for_each_possible_cpu(cpu) {
+		vmid = atomic64_xchg_relaxed(&per_cpu(active_vmids, cpu), 0);
+
+		/* Preserve reserved VMID */
+		if (vmid == 0)
+			vmid = per_cpu(reserved_vmids, cpu);
+		__set_bit(vmid2idx(vmid), vmid_map);
+		per_cpu(reserved_vmids, cpu) = vmid;
+	}
+
+	/*
+	 * Unlike ASID allocator, we expect less frequent rollover in
+	 * case of VMIDs. Hence, instead of marking the CPU as
+	 * flush_pending and issuing a local context invalidation on
+	 * the next context-switch, we broadcast TLB flush + I-cache
+	 * invalidation over the inner shareable domain on rollover.
+	 */
+	kvm_call_hyp(__kvm_flush_vm_context);
+}
+
+static bool check_update_reserved_vmid(u64 vmid, u64 newvmid)
+{
+	int cpu;
+	bool hit = false;
+
+	/*
+	 * Iterate over the set of reserved VMIDs looking for a match
+	 * and update to use newvmid (i.e. the same VMID in the current
+	 * generation).
+	 */
+	for_each_possible_cpu(cpu) {
+		if (per_cpu(reserved_vmids, cpu) == vmid) {
+			hit = true;
+			per_cpu(reserved_vmids, cpu) = newvmid;
+		}
+	}
+
+	return hit;
+}
+
+static u64 new_vmid(struct kvm_vmid *kvm_vmid)
+{
+	static u32 cur_idx = 1;
+	u64 vmid = atomic64_read(&kvm_vmid->id);
+	u64 generation = atomic64_read(&vmid_generation);
+
+	if (vmid != 0) {
+		u64 newvmid = generation | (vmid & ~VMID_MASK);
+
+		if (check_update_reserved_vmid(vmid, newvmid)) {
+			atomic64_set(&kvm_vmid->id, newvmid);
+			return newvmid;
+		}
+
+		if (!__test_and_set_bit(vmid2idx(vmid), vmid_map)) {
+			atomic64_set(&kvm_vmid->id, newvmid);
+			return newvmid;
+		}
+	}
+
+	vmid = find_next_zero_bit(vmid_map, NUM_USER_VMIDS, cur_idx);
+	if (vmid != NUM_USER_VMIDS)
+		goto set_vmid;
+
+	/* We're out of VMIDs, so increment the global generation count */
+	generation = atomic64_add_return_relaxed(VMID_FIRST_VERSION,
+						 &vmid_generation);
+	flush_context();
+
+	/* We have more VMIDs than CPUs, so this will always succeed */
+	vmid = find_next_zero_bit(vmid_map, NUM_USER_VMIDS, 1);
+
+set_vmid:
+	__set_bit(vmid, vmid_map);
+	cur_idx = vmid;
+	vmid = idx2vmid(vmid) | generation;
+	atomic64_set(&kvm_vmid->id, vmid);
+	return vmid;
+}
+
+/* Called from vCPU sched out with preemption disabled */
+void kvm_arm_vmid_clear_active(void)
+{
+	atomic64_set(this_cpu_ptr(&active_vmids), VMID_ACTIVE_INVALID);
+}
+
+void kvm_arm_vmid_update(struct kvm_vmid *kvm_vmid)
+{
+	unsigned long flags;
+	u64 vmid, old_active_vmid;
+
+	vmid = atomic64_read(&kvm_vmid->id);
+
+	/*
+	 * Please refer comments in check_and_switch_context() in
+	 * arch/arm64/mm/context.c.
+	 *
+	 * Unlike ASID allocator, we set the active_vmids to
+	 * VMID_ACTIVE_INVALID on vCPU schedule out to avoid
+	 * reserving the VMID space needlessly on rollover.
+	 * Hence explicitly check here for a "!= 0" to
+	 * handle the sync with a concurrent rollover.
+	 */
+	old_active_vmid = atomic64_read(this_cpu_ptr(&active_vmids));
+	if (old_active_vmid != 0 && vmid_gen_match(vmid) &&
+	    0 != atomic64_cmpxchg_relaxed(this_cpu_ptr(&active_vmids),
+					  old_active_vmid, vmid))
+		return;
+
+	raw_spin_lock_irqsave(&cpu_vmid_lock, flags);
+
+	/* Check that our VMID belongs to the current generation. */
+	vmid = atomic64_read(&kvm_vmid->id);
+	if (!vmid_gen_match(vmid))
+		vmid = new_vmid(kvm_vmid);
+
+	atomic64_set(this_cpu_ptr(&active_vmids), vmid);
+	raw_spin_unlock_irqrestore(&cpu_vmid_lock, flags);
+}
+
+/*
+ * Initialize the VMID allocator
+ */
+int kvm_arm_vmid_alloc_init(void)
+{
+	kvm_arm_vmid_bits = kvm_get_vmid_bits();
+
+	/*
+	 * Expect allocation after rollover to fail if we don't have
+	 * at least one more VMID than CPUs. VMID #0 is always reserved.
+	 */
+	WARN_ON(NUM_USER_VMIDS - 1 <= num_possible_cpus());
+	atomic64_set(&vmid_generation, VMID_FIRST_VERSION);
+	vmid_map = kcalloc(BITS_TO_LONGS(NUM_USER_VMIDS),
+			   sizeof(*vmid_map), GFP_KERNEL);
+	if (!vmid_map)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void kvm_arm_vmid_alloc_free(void)
+{
+	kfree(vmid_map);
+}