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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm64/kvm/vgic
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm64/kvm/vgic')
-rw-r--r--arch/arm64/kvm/vgic/trace.h38
-rw-r--r--arch/arm64/kvm/vgic/vgic-debug.c280
-rw-r--r--arch/arm64/kvm/vgic/vgic-init.c641
-rw-r--r--arch/arm64/kvm/vgic/vgic-irqfd.c155
-rw-r--r--arch/arm64/kvm/vgic/vgic-its.c2891
-rw-r--r--arch/arm64/kvm/vgic/vgic-kvm-device.c710
-rw-r--r--arch/arm64/kvm/vgic/vgic-mmio-v2.c561
-rw-r--r--arch/arm64/kvm/vgic/vgic-mmio-v3.c1186
-rw-r--r--arch/arm64/kvm/vgic/vgic-mmio.c1115
-rw-r--r--arch/arm64/kvm/vgic/vgic-mmio.h230
-rw-r--r--arch/arm64/kvm/vgic/vgic-v2.c480
-rw-r--r--arch/arm64/kvm/vgic/vgic-v3.c753
-rw-r--r--arch/arm64/kvm/vgic/vgic-v4.c521
-rw-r--r--arch/arm64/kvm/vgic/vgic.c1063
-rw-r--r--arch/arm64/kvm/vgic/vgic.h337
15 files changed, 10961 insertions, 0 deletions
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