summaryrefslogtreecommitdiffstats
path: root/arch/arm64/kvm/sys_regs.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/kvm/sys_regs.c')
-rw-r--r--arch/arm64/kvm/sys_regs.c3005
1 files changed, 3005 insertions, 0 deletions
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
new file mode 100644
index 000000000..457e74f1f
--- /dev/null
+++ b/arch/arm64/kvm/sys_regs.c
@@ -0,0 +1,3005 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/coproc.c:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Authors: Rusty Russell <rusty@rustcorp.com.au>
+ * Christoffer Dall <c.dall@virtualopensystems.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bsearch.h>
+#include <linux/kvm_host.h>
+#include <linux/mm.h>
+#include <linux/printk.h>
+#include <linux/uaccess.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cputype.h>
+#include <asm/debug-monitors.h>
+#include <asm/esr.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_hyp.h>
+#include <asm/kvm_mmu.h>
+#include <asm/perf_event.h>
+#include <asm/sysreg.h>
+
+#include <trace/events/kvm.h>
+
+#include "sys_regs.h"
+
+#include "trace.h"
+
+/*
+ * For AArch32, we only take care of what is being trapped. Anything
+ * that has to do with init and userspace access has to go via the
+ * 64bit interface.
+ */
+
+static u64 sys_reg_to_index(const struct sys_reg_desc *reg);
+
+static bool read_from_write_only(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params,
+ const struct sys_reg_desc *r)
+{
+ WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n");
+ print_sys_reg_instr(params);
+ kvm_inject_undefined(vcpu);
+ return false;
+}
+
+static bool write_to_read_only(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params,
+ const struct sys_reg_desc *r)
+{
+ WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n");
+ print_sys_reg_instr(params);
+ kvm_inject_undefined(vcpu);
+ return false;
+}
+
+u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg)
+{
+ u64 val = 0x8badf00d8badf00d;
+
+ if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) &&
+ __vcpu_read_sys_reg_from_cpu(reg, &val))
+ return val;
+
+ return __vcpu_sys_reg(vcpu, reg);
+}
+
+void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg)
+{
+ if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) &&
+ __vcpu_write_sys_reg_to_cpu(val, reg))
+ return;
+
+ __vcpu_sys_reg(vcpu, reg) = val;
+}
+
+/* 3 bits per cache level, as per CLIDR, but non-existent caches always 0 */
+static u32 cache_levels;
+
+/* CSSELR values; used to index KVM_REG_ARM_DEMUX_ID_CCSIDR */
+#define CSSELR_MAX 14
+
+/* Which cache CCSIDR represents depends on CSSELR value. */
+static u32 get_ccsidr(u32 csselr)
+{
+ u32 ccsidr;
+
+ /* Make sure noone else changes CSSELR during this! */
+ local_irq_disable();
+ write_sysreg(csselr, csselr_el1);
+ isb();
+ ccsidr = read_sysreg(ccsidr_el1);
+ local_irq_enable();
+
+ return ccsidr;
+}
+
+/*
+ * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized).
+ */
+static bool access_dcsw(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (!p->is_write)
+ return read_from_write_only(vcpu, p, r);
+
+ /*
+ * Only track S/W ops if we don't have FWB. It still indicates
+ * that the guest is a bit broken (S/W operations should only
+ * be done by firmware, knowing that there is only a single
+ * CPU left in the system, and certainly not from non-secure
+ * software).
+ */
+ if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
+ kvm_set_way_flush(vcpu);
+
+ return true;
+}
+
+static void get_access_mask(const struct sys_reg_desc *r, u64 *mask, u64 *shift)
+{
+ switch (r->aarch32_map) {
+ case AA32_LO:
+ *mask = GENMASK_ULL(31, 0);
+ *shift = 0;
+ break;
+ case AA32_HI:
+ *mask = GENMASK_ULL(63, 32);
+ *shift = 32;
+ break;
+ default:
+ *mask = GENMASK_ULL(63, 0);
+ *shift = 0;
+ break;
+ }
+}
+
+/*
+ * Generic accessor for VM registers. Only called as long as HCR_TVM
+ * is set. If the guest enables the MMU, we stop trapping the VM
+ * sys_regs and leave it in complete control of the caches.
+ */
+static bool access_vm_reg(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ bool was_enabled = vcpu_has_cache_enabled(vcpu);
+ u64 val, mask, shift;
+
+ BUG_ON(!p->is_write);
+
+ get_access_mask(r, &mask, &shift);
+
+ if (~mask) {
+ val = vcpu_read_sys_reg(vcpu, r->reg);
+ val &= ~mask;
+ } else {
+ val = 0;
+ }
+
+ val |= (p->regval & (mask >> shift)) << shift;
+ vcpu_write_sys_reg(vcpu, val, r->reg);
+
+ kvm_toggle_cache(vcpu, was_enabled);
+ return true;
+}
+
+static bool access_actlr(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 mask, shift;
+
+ if (p->is_write)
+ return ignore_write(vcpu, p);
+
+ get_access_mask(r, &mask, &shift);
+ p->regval = (vcpu_read_sys_reg(vcpu, r->reg) & mask) >> shift;
+
+ return true;
+}
+
+/*
+ * Trap handler for the GICv3 SGI generation system register.
+ * Forward the request to the VGIC emulation.
+ * The cp15_64 code makes sure this automatically works
+ * for both AArch64 and AArch32 accesses.
+ */
+static bool access_gic_sgi(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ bool g1;
+
+ if (!p->is_write)
+ return read_from_write_only(vcpu, p, r);
+
+ /*
+ * In a system where GICD_CTLR.DS=1, a ICC_SGI0R_EL1 access generates
+ * Group0 SGIs only, while ICC_SGI1R_EL1 can generate either group,
+ * depending on the SGI configuration. ICC_ASGI1R_EL1 is effectively
+ * equivalent to ICC_SGI0R_EL1, as there is no "alternative" secure
+ * group.
+ */
+ if (p->Op0 == 0) { /* AArch32 */
+ switch (p->Op1) {
+ default: /* Keep GCC quiet */
+ case 0: /* ICC_SGI1R */
+ g1 = true;
+ break;
+ case 1: /* ICC_ASGI1R */
+ case 2: /* ICC_SGI0R */
+ g1 = false;
+ break;
+ }
+ } else { /* AArch64 */
+ switch (p->Op2) {
+ default: /* Keep GCC quiet */
+ case 5: /* ICC_SGI1R_EL1 */
+ g1 = true;
+ break;
+ case 6: /* ICC_ASGI1R_EL1 */
+ case 7: /* ICC_SGI0R_EL1 */
+ g1 = false;
+ break;
+ }
+ }
+
+ vgic_v3_dispatch_sgi(vcpu, p->regval, g1);
+
+ return true;
+}
+
+static bool access_gic_sre(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write)
+ return ignore_write(vcpu, p);
+
+ p->regval = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre;
+ return true;
+}
+
+static bool trap_raz_wi(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write)
+ return ignore_write(vcpu, p);
+ else
+ return read_zero(vcpu, p);
+}
+
+/*
+ * ARMv8.1 mandates at least a trivial LORegion implementation, where all the
+ * RW registers are RES0 (which we can implement as RAZ/WI). On an ARMv8.0
+ * system, these registers should UNDEF. LORID_EL1 being a RO register, we
+ * treat it separately.
+ */
+static bool trap_loregion(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 val = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
+ u32 sr = reg_to_encoding(r);
+
+ if (!(val & (0xfUL << ID_AA64MMFR1_EL1_LO_SHIFT))) {
+ kvm_inject_undefined(vcpu);
+ return false;
+ }
+
+ if (p->is_write && sr == SYS_LORID_EL1)
+ return write_to_read_only(vcpu, p, r);
+
+ return trap_raz_wi(vcpu, p, r);
+}
+
+static bool trap_oslar_el1(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 oslsr;
+
+ if (!p->is_write)
+ return read_from_write_only(vcpu, p, r);
+
+ /* Forward the OSLK bit to OSLSR */
+ oslsr = __vcpu_sys_reg(vcpu, OSLSR_EL1) & ~SYS_OSLSR_OSLK;
+ if (p->regval & SYS_OSLAR_OSLK)
+ oslsr |= SYS_OSLSR_OSLK;
+
+ __vcpu_sys_reg(vcpu, OSLSR_EL1) = oslsr;
+ return true;
+}
+
+static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write)
+ return write_to_read_only(vcpu, p, r);
+
+ p->regval = __vcpu_sys_reg(vcpu, r->reg);
+ return true;
+}
+
+static int set_oslsr_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 val)
+{
+ /*
+ * The only modifiable bit is the OSLK bit. Refuse the write if
+ * userspace attempts to change any other bit in the register.
+ */
+ if ((val ^ rd->val) & ~SYS_OSLSR_OSLK)
+ return -EINVAL;
+
+ __vcpu_sys_reg(vcpu, rd->reg) = val;
+ return 0;
+}
+
+static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write) {
+ return ignore_write(vcpu, p);
+ } else {
+ p->regval = read_sysreg(dbgauthstatus_el1);
+ return true;
+ }
+}
+
+/*
+ * We want to avoid world-switching all the DBG registers all the
+ * time:
+ *
+ * - If we've touched any debug register, it is likely that we're
+ * going to touch more of them. It then makes sense to disable the
+ * traps and start doing the save/restore dance
+ * - If debug is active (DBG_MDSCR_KDE or DBG_MDSCR_MDE set), it is
+ * then mandatory to save/restore the registers, as the guest
+ * depends on them.
+ *
+ * For this, we use a DIRTY bit, indicating the guest has modified the
+ * debug registers, used as follow:
+ *
+ * On guest entry:
+ * - If the dirty bit is set (because we're coming back from trapping),
+ * disable the traps, save host registers, restore guest registers.
+ * - If debug is actively in use (DBG_MDSCR_KDE or DBG_MDSCR_MDE set),
+ * set the dirty bit, disable the traps, save host registers,
+ * restore guest registers.
+ * - Otherwise, enable the traps
+ *
+ * On guest exit:
+ * - If the dirty bit is set, save guest registers, restore host
+ * registers and clear the dirty bit. This ensure that the host can
+ * now use the debug registers.
+ */
+static bool trap_debug_regs(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write) {
+ vcpu_write_sys_reg(vcpu, p->regval, r->reg);
+ vcpu_set_flag(vcpu, DEBUG_DIRTY);
+ } else {
+ p->regval = vcpu_read_sys_reg(vcpu, r->reg);
+ }
+
+ trace_trap_reg(__func__, r->reg, p->is_write, p->regval);
+
+ return true;
+}
+
+/*
+ * reg_to_dbg/dbg_to_reg
+ *
+ * A 32 bit write to a debug register leave top bits alone
+ * A 32 bit read from a debug register only returns the bottom bits
+ *
+ * All writes will set the DEBUG_DIRTY flag to ensure the hyp code
+ * switches between host and guest values in future.
+ */
+static void reg_to_dbg(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *rd,
+ u64 *dbg_reg)
+{
+ u64 mask, shift, val;
+
+ get_access_mask(rd, &mask, &shift);
+
+ val = *dbg_reg;
+ val &= ~mask;
+ val |= (p->regval & (mask >> shift)) << shift;
+ *dbg_reg = val;
+
+ vcpu_set_flag(vcpu, DEBUG_DIRTY);
+}
+
+static void dbg_to_reg(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *rd,
+ u64 *dbg_reg)
+{
+ u64 mask, shift;
+
+ get_access_mask(rd, &mask, &shift);
+ p->regval = (*dbg_reg & mask) >> shift;
+}
+
+static bool trap_bvr(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *rd)
+{
+ u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm];
+
+ if (p->is_write)
+ reg_to_dbg(vcpu, p, rd, dbg_reg);
+ else
+ dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+ trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg);
+
+ return true;
+}
+
+static int set_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 val)
+{
+ vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = val;
+ return 0;
+}
+
+static int get_bvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 *val)
+{
+ *val = vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm];
+ return 0;
+}
+
+static void reset_bvr(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ vcpu->arch.vcpu_debug_state.dbg_bvr[rd->CRm] = rd->val;
+}
+
+static bool trap_bcr(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *rd)
+{
+ u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm];
+
+ if (p->is_write)
+ reg_to_dbg(vcpu, p, rd, dbg_reg);
+ else
+ dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+ trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg);
+
+ return true;
+}
+
+static int set_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 val)
+{
+ vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = val;
+ return 0;
+}
+
+static int get_bcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 *val)
+{
+ *val = vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm];
+ return 0;
+}
+
+static void reset_bcr(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ vcpu->arch.vcpu_debug_state.dbg_bcr[rd->CRm] = rd->val;
+}
+
+static bool trap_wvr(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *rd)
+{
+ u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm];
+
+ if (p->is_write)
+ reg_to_dbg(vcpu, p, rd, dbg_reg);
+ else
+ dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+ trace_trap_reg(__func__, rd->CRm, p->is_write,
+ vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm]);
+
+ return true;
+}
+
+static int set_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 val)
+{
+ vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = val;
+ return 0;
+}
+
+static int get_wvr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 *val)
+{
+ *val = vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm];
+ return 0;
+}
+
+static void reset_wvr(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ vcpu->arch.vcpu_debug_state.dbg_wvr[rd->CRm] = rd->val;
+}
+
+static bool trap_wcr(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *rd)
+{
+ u64 *dbg_reg = &vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm];
+
+ if (p->is_write)
+ reg_to_dbg(vcpu, p, rd, dbg_reg);
+ else
+ dbg_to_reg(vcpu, p, rd, dbg_reg);
+
+ trace_trap_reg(__func__, rd->CRm, p->is_write, *dbg_reg);
+
+ return true;
+}
+
+static int set_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 val)
+{
+ vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = val;
+ return 0;
+}
+
+static int get_wcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 *val)
+{
+ *val = vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm];
+ return 0;
+}
+
+static void reset_wcr(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ vcpu->arch.vcpu_debug_state.dbg_wcr[rd->CRm] = rd->val;
+}
+
+static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ u64 amair = read_sysreg(amair_el1);
+ vcpu_write_sys_reg(vcpu, amair, AMAIR_EL1);
+}
+
+static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ u64 actlr = read_sysreg(actlr_el1);
+ vcpu_write_sys_reg(vcpu, actlr, ACTLR_EL1);
+}
+
+static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ u64 mpidr;
+
+ /*
+ * Map the vcpu_id into the first three affinity level fields of
+ * the MPIDR. We limit the number of VCPUs in level 0 due to a
+ * limitation to 16 CPUs in that level in the ICC_SGIxR registers
+ * of the GICv3 to be able to address each CPU directly when
+ * sending IPIs.
+ */
+ mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0);
+ mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1);
+ mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2);
+ vcpu_write_sys_reg(vcpu, (1ULL << 31) | mpidr, MPIDR_EL1);
+}
+
+static unsigned int pmu_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *r)
+{
+ if (kvm_vcpu_has_pmu(vcpu))
+ return 0;
+
+ return REG_HIDDEN;
+}
+
+static void reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ u64 n, mask = BIT(ARMV8_PMU_CYCLE_IDX);
+
+ /* No PMU available, any PMU reg may UNDEF... */
+ if (!kvm_arm_support_pmu_v3())
+ return;
+
+ n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT;
+ n &= ARMV8_PMU_PMCR_N_MASK;
+ if (n)
+ mask |= GENMASK(n - 1, 0);
+
+ reset_unknown(vcpu, r);
+ __vcpu_sys_reg(vcpu, r->reg) &= mask;
+}
+
+static void reset_pmevcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ reset_unknown(vcpu, r);
+ __vcpu_sys_reg(vcpu, r->reg) &= GENMASK(31, 0);
+}
+
+static void reset_pmevtyper(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ reset_unknown(vcpu, r);
+ __vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_EVTYPE_MASK;
+}
+
+static void reset_pmselr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ reset_unknown(vcpu, r);
+ __vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_COUNTER_MASK;
+}
+
+static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ u64 pmcr, val;
+
+ /* No PMU available, PMCR_EL0 may UNDEF... */
+ if (!kvm_arm_support_pmu_v3())
+ return;
+
+ pmcr = read_sysreg(pmcr_el0);
+ /*
+ * Writable bits of PMCR_EL0 (ARMV8_PMU_PMCR_MASK) are reset to UNKNOWN
+ * except PMCR.E resetting to zero.
+ */
+ val = ((pmcr & ~ARMV8_PMU_PMCR_MASK)
+ | (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E);
+ if (!kvm_supports_32bit_el0())
+ val |= ARMV8_PMU_PMCR_LC;
+ __vcpu_sys_reg(vcpu, r->reg) = val;
+}
+
+static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags)
+{
+ u64 reg = __vcpu_sys_reg(vcpu, PMUSERENR_EL0);
+ bool enabled = (reg & flags) || vcpu_mode_priv(vcpu);
+
+ if (!enabled)
+ kvm_inject_undefined(vcpu);
+
+ return !enabled;
+}
+
+static bool pmu_access_el0_disabled(struct kvm_vcpu *vcpu)
+{
+ return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_EN);
+}
+
+static bool pmu_write_swinc_el0_disabled(struct kvm_vcpu *vcpu)
+{
+ return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_SW | ARMV8_PMU_USERENR_EN);
+}
+
+static bool pmu_access_cycle_counter_el0_disabled(struct kvm_vcpu *vcpu)
+{
+ return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_CR | ARMV8_PMU_USERENR_EN);
+}
+
+static bool pmu_access_event_counter_el0_disabled(struct kvm_vcpu *vcpu)
+{
+ return check_pmu_access_disabled(vcpu, ARMV8_PMU_USERENR_ER | ARMV8_PMU_USERENR_EN);
+}
+
+static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 val;
+
+ if (pmu_access_el0_disabled(vcpu))
+ return false;
+
+ if (p->is_write) {
+ /*
+ * Only update writeable bits of PMCR (continuing into
+ * kvm_pmu_handle_pmcr() as well)
+ */
+ val = __vcpu_sys_reg(vcpu, PMCR_EL0);
+ val &= ~ARMV8_PMU_PMCR_MASK;
+ val |= p->regval & ARMV8_PMU_PMCR_MASK;
+ if (!kvm_supports_32bit_el0())
+ val |= ARMV8_PMU_PMCR_LC;
+ kvm_pmu_handle_pmcr(vcpu, val);
+ } else {
+ /* PMCR.P & PMCR.C are RAZ */
+ val = __vcpu_sys_reg(vcpu, PMCR_EL0)
+ & ~(ARMV8_PMU_PMCR_P | ARMV8_PMU_PMCR_C);
+ p->regval = val;
+ }
+
+ return true;
+}
+
+static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (pmu_access_event_counter_el0_disabled(vcpu))
+ return false;
+
+ if (p->is_write)
+ __vcpu_sys_reg(vcpu, PMSELR_EL0) = p->regval;
+ else
+ /* return PMSELR.SEL field */
+ p->regval = __vcpu_sys_reg(vcpu, PMSELR_EL0)
+ & ARMV8_PMU_COUNTER_MASK;
+
+ return true;
+}
+
+static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 pmceid, mask, shift;
+
+ BUG_ON(p->is_write);
+
+ if (pmu_access_el0_disabled(vcpu))
+ return false;
+
+ get_access_mask(r, &mask, &shift);
+
+ pmceid = kvm_pmu_get_pmceid(vcpu, (p->Op2 & 1));
+ pmceid &= mask;
+ pmceid >>= shift;
+
+ p->regval = pmceid;
+
+ return true;
+}
+
+static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx)
+{
+ u64 pmcr, val;
+
+ pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0);
+ val = (pmcr >> ARMV8_PMU_PMCR_N_SHIFT) & ARMV8_PMU_PMCR_N_MASK;
+ if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) {
+ kvm_inject_undefined(vcpu);
+ return false;
+ }
+
+ return true;
+}
+
+static int get_pmu_evcntr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+ u64 *val)
+{
+ u64 idx;
+
+ if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 0)
+ /* PMCCNTR_EL0 */
+ idx = ARMV8_PMU_CYCLE_IDX;
+ else
+ /* PMEVCNTRn_EL0 */
+ idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
+
+ *val = kvm_pmu_get_counter_value(vcpu, idx);
+ return 0;
+}
+
+static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 idx = ~0UL;
+
+ if (r->CRn == 9 && r->CRm == 13) {
+ if (r->Op2 == 2) {
+ /* PMXEVCNTR_EL0 */
+ if (pmu_access_event_counter_el0_disabled(vcpu))
+ return false;
+
+ idx = __vcpu_sys_reg(vcpu, PMSELR_EL0)
+ & ARMV8_PMU_COUNTER_MASK;
+ } else if (r->Op2 == 0) {
+ /* PMCCNTR_EL0 */
+ if (pmu_access_cycle_counter_el0_disabled(vcpu))
+ return false;
+
+ idx = ARMV8_PMU_CYCLE_IDX;
+ }
+ } else if (r->CRn == 0 && r->CRm == 9) {
+ /* PMCCNTR */
+ if (pmu_access_event_counter_el0_disabled(vcpu))
+ return false;
+
+ idx = ARMV8_PMU_CYCLE_IDX;
+ } else if (r->CRn == 14 && (r->CRm & 12) == 8) {
+ /* PMEVCNTRn_EL0 */
+ if (pmu_access_event_counter_el0_disabled(vcpu))
+ return false;
+
+ idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
+ }
+
+ /* Catch any decoding mistake */
+ WARN_ON(idx == ~0UL);
+
+ if (!pmu_counter_idx_valid(vcpu, idx))
+ return false;
+
+ if (p->is_write) {
+ if (pmu_access_el0_disabled(vcpu))
+ return false;
+
+ kvm_pmu_set_counter_value(vcpu, idx, p->regval);
+ } else {
+ p->regval = kvm_pmu_get_counter_value(vcpu, idx);
+ }
+
+ return true;
+}
+
+static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 idx, reg;
+
+ if (pmu_access_el0_disabled(vcpu))
+ return false;
+
+ if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 1) {
+ /* PMXEVTYPER_EL0 */
+ idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_PMU_COUNTER_MASK;
+ reg = PMEVTYPER0_EL0 + idx;
+ } else if (r->CRn == 14 && (r->CRm & 12) == 12) {
+ idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
+ if (idx == ARMV8_PMU_CYCLE_IDX)
+ reg = PMCCFILTR_EL0;
+ else
+ /* PMEVTYPERn_EL0 */
+ reg = PMEVTYPER0_EL0 + idx;
+ } else {
+ BUG();
+ }
+
+ if (!pmu_counter_idx_valid(vcpu, idx))
+ return false;
+
+ if (p->is_write) {
+ kvm_pmu_set_counter_event_type(vcpu, p->regval, idx);
+ __vcpu_sys_reg(vcpu, reg) = p->regval & ARMV8_PMU_EVTYPE_MASK;
+ kvm_vcpu_pmu_restore_guest(vcpu);
+ } else {
+ p->regval = __vcpu_sys_reg(vcpu, reg) & ARMV8_PMU_EVTYPE_MASK;
+ }
+
+ return true;
+}
+
+static bool access_pmcnten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 val, mask;
+
+ if (pmu_access_el0_disabled(vcpu))
+ return false;
+
+ mask = kvm_pmu_valid_counter_mask(vcpu);
+ if (p->is_write) {
+ val = p->regval & mask;
+ if (r->Op2 & 0x1) {
+ /* accessing PMCNTENSET_EL0 */
+ __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) |= val;
+ kvm_pmu_enable_counter_mask(vcpu, val);
+ kvm_vcpu_pmu_restore_guest(vcpu);
+ } else {
+ /* accessing PMCNTENCLR_EL0 */
+ __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) &= ~val;
+ kvm_pmu_disable_counter_mask(vcpu, val);
+ }
+ } else {
+ p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
+ }
+
+ return true;
+}
+
+static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 mask = kvm_pmu_valid_counter_mask(vcpu);
+
+ if (check_pmu_access_disabled(vcpu, 0))
+ return false;
+
+ if (p->is_write) {
+ u64 val = p->regval & mask;
+
+ if (r->Op2 & 0x1)
+ /* accessing PMINTENSET_EL1 */
+ __vcpu_sys_reg(vcpu, PMINTENSET_EL1) |= val;
+ else
+ /* accessing PMINTENCLR_EL1 */
+ __vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= ~val;
+ } else {
+ p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1);
+ }
+
+ return true;
+}
+
+static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 mask = kvm_pmu_valid_counter_mask(vcpu);
+
+ if (pmu_access_el0_disabled(vcpu))
+ return false;
+
+ if (p->is_write) {
+ if (r->CRm & 0x2)
+ /* accessing PMOVSSET_EL0 */
+ __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= (p->regval & mask);
+ else
+ /* accessing PMOVSCLR_EL0 */
+ __vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask);
+ } else {
+ p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0);
+ }
+
+ return true;
+}
+
+static bool access_pmswinc(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u64 mask;
+
+ if (!p->is_write)
+ return read_from_write_only(vcpu, p, r);
+
+ if (pmu_write_swinc_el0_disabled(vcpu))
+ return false;
+
+ mask = kvm_pmu_valid_counter_mask(vcpu);
+ kvm_pmu_software_increment(vcpu, p->regval & mask);
+ return true;
+}
+
+static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write) {
+ if (!vcpu_mode_priv(vcpu)) {
+ kvm_inject_undefined(vcpu);
+ return false;
+ }
+
+ __vcpu_sys_reg(vcpu, PMUSERENR_EL0) =
+ p->regval & ARMV8_PMU_USERENR_MASK;
+ } else {
+ p->regval = __vcpu_sys_reg(vcpu, PMUSERENR_EL0)
+ & ARMV8_PMU_USERENR_MASK;
+ }
+
+ return true;
+}
+
+/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
+#define DBG_BCR_BVR_WCR_WVR_EL1(n) \
+ { SYS_DESC(SYS_DBGBVRn_EL1(n)), \
+ trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr }, \
+ { SYS_DESC(SYS_DBGBCRn_EL1(n)), \
+ trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr }, \
+ { SYS_DESC(SYS_DBGWVRn_EL1(n)), \
+ trap_wvr, reset_wvr, 0, 0, get_wvr, set_wvr }, \
+ { SYS_DESC(SYS_DBGWCRn_EL1(n)), \
+ trap_wcr, reset_wcr, 0, 0, get_wcr, set_wcr }
+
+#define PMU_SYS_REG(r) \
+ SYS_DESC(r), .reset = reset_pmu_reg, .visibility = pmu_visibility
+
+/* Macro to expand the PMEVCNTRn_EL0 register */
+#define PMU_PMEVCNTR_EL0(n) \
+ { PMU_SYS_REG(SYS_PMEVCNTRn_EL0(n)), \
+ .reset = reset_pmevcntr, .get_user = get_pmu_evcntr, \
+ .access = access_pmu_evcntr, .reg = (PMEVCNTR0_EL0 + n), }
+
+/* Macro to expand the PMEVTYPERn_EL0 register */
+#define PMU_PMEVTYPER_EL0(n) \
+ { PMU_SYS_REG(SYS_PMEVTYPERn_EL0(n)), \
+ .reset = reset_pmevtyper, \
+ .access = access_pmu_evtyper, .reg = (PMEVTYPER0_EL0 + n), }
+
+static bool undef_access(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ kvm_inject_undefined(vcpu);
+
+ return false;
+}
+
+/* Macro to expand the AMU counter and type registers*/
+#define AMU_AMEVCNTR0_EL0(n) { SYS_DESC(SYS_AMEVCNTR0_EL0(n)), undef_access }
+#define AMU_AMEVTYPER0_EL0(n) { SYS_DESC(SYS_AMEVTYPER0_EL0(n)), undef_access }
+#define AMU_AMEVCNTR1_EL0(n) { SYS_DESC(SYS_AMEVCNTR1_EL0(n)), undef_access }
+#define AMU_AMEVTYPER1_EL0(n) { SYS_DESC(SYS_AMEVTYPER1_EL0(n)), undef_access }
+
+static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN;
+}
+
+/*
+ * If we land here on a PtrAuth access, that is because we didn't
+ * fixup the access on exit by allowing the PtrAuth sysregs. The only
+ * way this happens is when the guest does not have PtrAuth support
+ * enabled.
+ */
+#define __PTRAUTH_KEY(k) \
+ { SYS_DESC(SYS_## k), undef_access, reset_unknown, k, \
+ .visibility = ptrauth_visibility}
+
+#define PTRAUTH_KEY(k) \
+ __PTRAUTH_KEY(k ## KEYLO_EL1), \
+ __PTRAUTH_KEY(k ## KEYHI_EL1)
+
+static bool access_arch_timer(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ enum kvm_arch_timers tmr;
+ enum kvm_arch_timer_regs treg;
+ u64 reg = reg_to_encoding(r);
+
+ switch (reg) {
+ case SYS_CNTP_TVAL_EL0:
+ case SYS_AARCH32_CNTP_TVAL:
+ tmr = TIMER_PTIMER;
+ treg = TIMER_REG_TVAL;
+ break;
+ case SYS_CNTP_CTL_EL0:
+ case SYS_AARCH32_CNTP_CTL:
+ tmr = TIMER_PTIMER;
+ treg = TIMER_REG_CTL;
+ break;
+ case SYS_CNTP_CVAL_EL0:
+ case SYS_AARCH32_CNTP_CVAL:
+ tmr = TIMER_PTIMER;
+ treg = TIMER_REG_CVAL;
+ break;
+ default:
+ BUG();
+ }
+
+ if (p->is_write)
+ kvm_arm_timer_write_sysreg(vcpu, tmr, treg, p->regval);
+ else
+ p->regval = kvm_arm_timer_read_sysreg(vcpu, tmr, treg);
+
+ return true;
+}
+
+/* Read a sanitised cpufeature ID register by sys_reg_desc */
+static u64 read_id_reg(const struct kvm_vcpu *vcpu, struct sys_reg_desc const *r)
+{
+ u32 id = reg_to_encoding(r);
+ u64 val;
+
+ if (sysreg_visible_as_raz(vcpu, r))
+ return 0;
+
+ val = read_sanitised_ftr_reg(id);
+
+ switch (id) {
+ case SYS_ID_AA64PFR0_EL1:
+ if (!vcpu_has_sve(vcpu))
+ val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_SVE);
+ val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_AMU);
+ val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2);
+ val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2), (u64)vcpu->kvm->arch.pfr0_csv2);
+ val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3);
+ val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3), (u64)vcpu->kvm->arch.pfr0_csv3);
+ if (kvm_vgic_global_state.type == VGIC_V3) {
+ val &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_GIC);
+ val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_GIC), 1);
+ }
+ break;
+ case SYS_ID_AA64PFR1_EL1:
+ if (!kvm_has_mte(vcpu->kvm))
+ val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE);
+
+ val &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SME);
+ break;
+ case SYS_ID_AA64ISAR1_EL1:
+ if (!vcpu_has_ptrauth(vcpu))
+ val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA) |
+ ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API) |
+ ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPA) |
+ ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_GPI));
+ break;
+ case SYS_ID_AA64ISAR2_EL1:
+ if (!vcpu_has_ptrauth(vcpu))
+ val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) |
+ ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3));
+ if (!cpus_have_final_cap(ARM64_HAS_WFXT))
+ val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT);
+ break;
+ case SYS_ID_AA64DFR0_EL1:
+ /* Limit debug to ARMv8.0 */
+ val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DebugVer);
+ val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DebugVer), 6);
+ /* Limit guests to PMUv3 for ARMv8.4 */
+ val = cpuid_feature_cap_perfmon_field(val,
+ ID_AA64DFR0_EL1_PMUVer_SHIFT,
+ kvm_vcpu_has_pmu(vcpu) ? ID_AA64DFR0_EL1_PMUVer_V3P4 : 0);
+ /* Hide SPE from guests */
+ val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMSVer);
+ break;
+ case SYS_ID_DFR0_EL1:
+ /* Limit guests to PMUv3 for ARMv8.4 */
+ val = cpuid_feature_cap_perfmon_field(val,
+ ID_DFR0_PERFMON_SHIFT,
+ kvm_vcpu_has_pmu(vcpu) ? ID_DFR0_PERFMON_8_4 : 0);
+ break;
+ }
+
+ return val;
+}
+
+static unsigned int id_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *r)
+{
+ u32 id = reg_to_encoding(r);
+
+ switch (id) {
+ case SYS_ID_AA64ZFR0_EL1:
+ if (!vcpu_has_sve(vcpu))
+ return REG_RAZ;
+ break;
+ }
+
+ return 0;
+}
+
+static unsigned int aa32_id_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *r)
+{
+ /*
+ * AArch32 ID registers are UNKNOWN if AArch32 isn't implemented at any
+ * EL. Promote to RAZ/WI in order to guarantee consistency between
+ * systems.
+ */
+ if (!kvm_supports_32bit_el0())
+ return REG_RAZ | REG_USER_WI;
+
+ return id_visibility(vcpu, r);
+}
+
+static unsigned int raz_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *r)
+{
+ return REG_RAZ;
+}
+
+/* cpufeature ID register access trap handlers */
+
+static bool access_id_reg(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write)
+ return write_to_read_only(vcpu, p, r);
+
+ p->regval = read_id_reg(vcpu, r);
+ return true;
+}
+
+/* Visibility overrides for SVE-specific control registers */
+static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ if (vcpu_has_sve(vcpu))
+ return 0;
+
+ return REG_HIDDEN;
+}
+
+static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd,
+ u64 val)
+{
+ u8 csv2, csv3;
+
+ /*
+ * Allow AA64PFR0_EL1.CSV2 to be set from userspace as long as
+ * it doesn't promise more than what is actually provided (the
+ * guest could otherwise be covered in ectoplasmic residue).
+ */
+ csv2 = cpuid_feature_extract_unsigned_field(val, ID_AA64PFR0_EL1_CSV2_SHIFT);
+ if (csv2 > 1 ||
+ (csv2 && arm64_get_spectre_v2_state() != SPECTRE_UNAFFECTED))
+ return -EINVAL;
+
+ /* Same thing for CSV3 */
+ csv3 = cpuid_feature_extract_unsigned_field(val, ID_AA64PFR0_EL1_CSV3_SHIFT);
+ if (csv3 > 1 ||
+ (csv3 && arm64_get_meltdown_state() != SPECTRE_UNAFFECTED))
+ return -EINVAL;
+
+ /* We can only differ with CSV[23], and anything else is an error */
+ val ^= read_id_reg(vcpu, rd);
+ val &= ~(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2) |
+ ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3));
+ if (val)
+ return -EINVAL;
+
+ vcpu->kvm->arch.pfr0_csv2 = csv2;
+ vcpu->kvm->arch.pfr0_csv3 = csv3;
+
+ return 0;
+}
+
+/*
+ * cpufeature ID register user accessors
+ *
+ * For now, these registers are immutable for userspace, so no values
+ * are stored, and for set_id_reg() we don't allow the effective value
+ * to be changed.
+ */
+static int get_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 *val)
+{
+ *val = read_id_reg(vcpu, rd);
+ return 0;
+}
+
+static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 val)
+{
+ /* This is what we mean by invariant: you can't change it. */
+ if (val != read_id_reg(vcpu, rd))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int get_raz_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 *val)
+{
+ *val = 0;
+ return 0;
+}
+
+static int set_wi_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
+ u64 val)
+{
+ return 0;
+}
+
+static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write)
+ return write_to_read_only(vcpu, p, r);
+
+ p->regval = read_sanitised_ftr_reg(SYS_CTR_EL0);
+ return true;
+}
+
+static bool access_clidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write)
+ return write_to_read_only(vcpu, p, r);
+
+ p->regval = read_sysreg(clidr_el1);
+ return true;
+}
+
+static bool access_csselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ int reg = r->reg;
+
+ if (p->is_write)
+ vcpu_write_sys_reg(vcpu, p->regval, reg);
+ else
+ p->regval = vcpu_read_sys_reg(vcpu, reg);
+ return true;
+}
+
+static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ u32 csselr;
+
+ if (p->is_write)
+ return write_to_read_only(vcpu, p, r);
+
+ csselr = vcpu_read_sys_reg(vcpu, CSSELR_EL1);
+ p->regval = get_ccsidr(csselr);
+
+ /*
+ * Guests should not be doing cache operations by set/way at all, and
+ * for this reason, we trap them and attempt to infer the intent, so
+ * that we can flush the entire guest's address space at the appropriate
+ * time.
+ * To prevent this trapping from causing performance problems, let's
+ * expose the geometry of all data and unified caches (which are
+ * guaranteed to be PIPT and thus non-aliasing) as 1 set and 1 way.
+ * [If guests should attempt to infer aliasing properties from the
+ * geometry (which is not permitted by the architecture), they would
+ * only do so for virtually indexed caches.]
+ */
+ if (!(csselr & 1)) // data or unified cache
+ p->regval &= ~GENMASK(27, 3);
+ return true;
+}
+
+static unsigned int mte_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ if (kvm_has_mte(vcpu->kvm))
+ return 0;
+
+ return REG_HIDDEN;
+}
+
+#define MTE_REG(name) { \
+ SYS_DESC(SYS_##name), \
+ .access = undef_access, \
+ .reset = reset_unknown, \
+ .reg = name, \
+ .visibility = mte_visibility, \
+}
+
+/* sys_reg_desc initialiser for known cpufeature ID registers */
+#define ID_SANITISED(name) { \
+ SYS_DESC(SYS_##name), \
+ .access = access_id_reg, \
+ .get_user = get_id_reg, \
+ .set_user = set_id_reg, \
+ .visibility = id_visibility, \
+}
+
+/* sys_reg_desc initialiser for known cpufeature ID registers */
+#define AA32_ID_SANITISED(name) { \
+ SYS_DESC(SYS_##name), \
+ .access = access_id_reg, \
+ .get_user = get_id_reg, \
+ .set_user = set_id_reg, \
+ .visibility = aa32_id_visibility, \
+}
+
+/*
+ * sys_reg_desc initialiser for architecturally unallocated cpufeature ID
+ * register with encoding Op0=3, Op1=0, CRn=0, CRm=crm, Op2=op2
+ * (1 <= crm < 8, 0 <= Op2 < 8).
+ */
+#define ID_UNALLOCATED(crm, op2) { \
+ Op0(3), Op1(0), CRn(0), CRm(crm), Op2(op2), \
+ .access = access_id_reg, \
+ .get_user = get_id_reg, \
+ .set_user = set_id_reg, \
+ .visibility = raz_visibility \
+}
+
+/*
+ * sys_reg_desc initialiser for known ID registers that we hide from guests.
+ * For now, these are exposed just like unallocated ID regs: they appear
+ * RAZ for the guest.
+ */
+#define ID_HIDDEN(name) { \
+ SYS_DESC(SYS_##name), \
+ .access = access_id_reg, \
+ .get_user = get_id_reg, \
+ .set_user = set_id_reg, \
+ .visibility = raz_visibility, \
+}
+
+/*
+ * Architected system registers.
+ * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
+ *
+ * Debug handling: We do trap most, if not all debug related system
+ * registers. The implementation is good enough to ensure that a guest
+ * can use these with minimal performance degradation. The drawback is
+ * that we don't implement any of the external debug architecture.
+ * This should be revisited if we ever encounter a more demanding
+ * guest...
+ */
+static const struct sys_reg_desc sys_reg_descs[] = {
+ { SYS_DESC(SYS_DC_ISW), access_dcsw },
+ { SYS_DESC(SYS_DC_CSW), access_dcsw },
+ { SYS_DESC(SYS_DC_CISW), access_dcsw },
+
+ DBG_BCR_BVR_WCR_WVR_EL1(0),
+ DBG_BCR_BVR_WCR_WVR_EL1(1),
+ { SYS_DESC(SYS_MDCCINT_EL1), trap_debug_regs, reset_val, MDCCINT_EL1, 0 },
+ { SYS_DESC(SYS_MDSCR_EL1), trap_debug_regs, reset_val, MDSCR_EL1, 0 },
+ DBG_BCR_BVR_WCR_WVR_EL1(2),
+ DBG_BCR_BVR_WCR_WVR_EL1(3),
+ DBG_BCR_BVR_WCR_WVR_EL1(4),
+ DBG_BCR_BVR_WCR_WVR_EL1(5),
+ DBG_BCR_BVR_WCR_WVR_EL1(6),
+ DBG_BCR_BVR_WCR_WVR_EL1(7),
+ DBG_BCR_BVR_WCR_WVR_EL1(8),
+ DBG_BCR_BVR_WCR_WVR_EL1(9),
+ DBG_BCR_BVR_WCR_WVR_EL1(10),
+ DBG_BCR_BVR_WCR_WVR_EL1(11),
+ DBG_BCR_BVR_WCR_WVR_EL1(12),
+ DBG_BCR_BVR_WCR_WVR_EL1(13),
+ DBG_BCR_BVR_WCR_WVR_EL1(14),
+ DBG_BCR_BVR_WCR_WVR_EL1(15),
+
+ { SYS_DESC(SYS_MDRAR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_OSLAR_EL1), trap_oslar_el1 },
+ { SYS_DESC(SYS_OSLSR_EL1), trap_oslsr_el1, reset_val, OSLSR_EL1,
+ SYS_OSLSR_OSLM_IMPLEMENTED, .set_user = set_oslsr_el1, },
+ { SYS_DESC(SYS_OSDLR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_DBGPRCR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_DBGCLAIMSET_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_DBGCLAIMCLR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_DBGAUTHSTATUS_EL1), trap_dbgauthstatus_el1 },
+
+ { SYS_DESC(SYS_MDCCSR_EL0), trap_raz_wi },
+ { SYS_DESC(SYS_DBGDTR_EL0), trap_raz_wi },
+ // DBGDTR[TR]X_EL0 share the same encoding
+ { SYS_DESC(SYS_DBGDTRTX_EL0), trap_raz_wi },
+
+ { SYS_DESC(SYS_DBGVCR32_EL2), NULL, reset_val, DBGVCR32_EL2, 0 },
+
+ { SYS_DESC(SYS_MPIDR_EL1), NULL, reset_mpidr, MPIDR_EL1 },
+
+ /*
+ * ID regs: all ID_SANITISED() entries here must have corresponding
+ * entries in arm64_ftr_regs[].
+ */
+
+ /* AArch64 mappings of the AArch32 ID registers */
+ /* CRm=1 */
+ AA32_ID_SANITISED(ID_PFR0_EL1),
+ AA32_ID_SANITISED(ID_PFR1_EL1),
+ AA32_ID_SANITISED(ID_DFR0_EL1),
+ ID_HIDDEN(ID_AFR0_EL1),
+ AA32_ID_SANITISED(ID_MMFR0_EL1),
+ AA32_ID_SANITISED(ID_MMFR1_EL1),
+ AA32_ID_SANITISED(ID_MMFR2_EL1),
+ AA32_ID_SANITISED(ID_MMFR3_EL1),
+
+ /* CRm=2 */
+ AA32_ID_SANITISED(ID_ISAR0_EL1),
+ AA32_ID_SANITISED(ID_ISAR1_EL1),
+ AA32_ID_SANITISED(ID_ISAR2_EL1),
+ AA32_ID_SANITISED(ID_ISAR3_EL1),
+ AA32_ID_SANITISED(ID_ISAR4_EL1),
+ AA32_ID_SANITISED(ID_ISAR5_EL1),
+ AA32_ID_SANITISED(ID_MMFR4_EL1),
+ AA32_ID_SANITISED(ID_ISAR6_EL1),
+
+ /* CRm=3 */
+ AA32_ID_SANITISED(MVFR0_EL1),
+ AA32_ID_SANITISED(MVFR1_EL1),
+ AA32_ID_SANITISED(MVFR2_EL1),
+ ID_UNALLOCATED(3,3),
+ AA32_ID_SANITISED(ID_PFR2_EL1),
+ ID_HIDDEN(ID_DFR1_EL1),
+ AA32_ID_SANITISED(ID_MMFR5_EL1),
+ ID_UNALLOCATED(3,7),
+
+ /* AArch64 ID registers */
+ /* CRm=4 */
+ { SYS_DESC(SYS_ID_AA64PFR0_EL1), .access = access_id_reg,
+ .get_user = get_id_reg, .set_user = set_id_aa64pfr0_el1, },
+ ID_SANITISED(ID_AA64PFR1_EL1),
+ ID_UNALLOCATED(4,2),
+ ID_UNALLOCATED(4,3),
+ ID_SANITISED(ID_AA64ZFR0_EL1),
+ ID_HIDDEN(ID_AA64SMFR0_EL1),
+ ID_UNALLOCATED(4,6),
+ ID_UNALLOCATED(4,7),
+
+ /* CRm=5 */
+ ID_SANITISED(ID_AA64DFR0_EL1),
+ ID_SANITISED(ID_AA64DFR1_EL1),
+ ID_UNALLOCATED(5,2),
+ ID_UNALLOCATED(5,3),
+ ID_HIDDEN(ID_AA64AFR0_EL1),
+ ID_HIDDEN(ID_AA64AFR1_EL1),
+ ID_UNALLOCATED(5,6),
+ ID_UNALLOCATED(5,7),
+
+ /* CRm=6 */
+ ID_SANITISED(ID_AA64ISAR0_EL1),
+ ID_SANITISED(ID_AA64ISAR1_EL1),
+ ID_SANITISED(ID_AA64ISAR2_EL1),
+ ID_UNALLOCATED(6,3),
+ ID_UNALLOCATED(6,4),
+ ID_UNALLOCATED(6,5),
+ ID_UNALLOCATED(6,6),
+ ID_UNALLOCATED(6,7),
+
+ /* CRm=7 */
+ ID_SANITISED(ID_AA64MMFR0_EL1),
+ ID_SANITISED(ID_AA64MMFR1_EL1),
+ ID_SANITISED(ID_AA64MMFR2_EL1),
+ ID_UNALLOCATED(7,3),
+ ID_UNALLOCATED(7,4),
+ ID_UNALLOCATED(7,5),
+ ID_UNALLOCATED(7,6),
+ ID_UNALLOCATED(7,7),
+
+ { SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 },
+ { SYS_DESC(SYS_ACTLR_EL1), access_actlr, reset_actlr, ACTLR_EL1 },
+ { SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 },
+
+ MTE_REG(RGSR_EL1),
+ MTE_REG(GCR_EL1),
+
+ { SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility },
+ { SYS_DESC(SYS_TRFCR_EL1), undef_access },
+ { SYS_DESC(SYS_SMPRI_EL1), undef_access },
+ { SYS_DESC(SYS_SMCR_EL1), undef_access },
+ { SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 },
+ { SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 },
+ { SYS_DESC(SYS_TCR_EL1), access_vm_reg, reset_val, TCR_EL1, 0 },
+
+ PTRAUTH_KEY(APIA),
+ PTRAUTH_KEY(APIB),
+ PTRAUTH_KEY(APDA),
+ PTRAUTH_KEY(APDB),
+ PTRAUTH_KEY(APGA),
+
+ { SYS_DESC(SYS_AFSR0_EL1), access_vm_reg, reset_unknown, AFSR0_EL1 },
+ { SYS_DESC(SYS_AFSR1_EL1), access_vm_reg, reset_unknown, AFSR1_EL1 },
+ { SYS_DESC(SYS_ESR_EL1), access_vm_reg, reset_unknown, ESR_EL1 },
+
+ { SYS_DESC(SYS_ERRIDR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_ERRSELR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_ERXFR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_ERXCTLR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_ERXSTATUS_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_ERXADDR_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi },
+ { SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi },
+
+ MTE_REG(TFSR_EL1),
+ MTE_REG(TFSRE0_EL1),
+
+ { SYS_DESC(SYS_FAR_EL1), access_vm_reg, reset_unknown, FAR_EL1 },
+ { SYS_DESC(SYS_PAR_EL1), NULL, reset_unknown, PAR_EL1 },
+
+ { SYS_DESC(SYS_PMSCR_EL1), undef_access },
+ { SYS_DESC(SYS_PMSNEVFR_EL1), undef_access },
+ { SYS_DESC(SYS_PMSICR_EL1), undef_access },
+ { SYS_DESC(SYS_PMSIRR_EL1), undef_access },
+ { SYS_DESC(SYS_PMSFCR_EL1), undef_access },
+ { SYS_DESC(SYS_PMSEVFR_EL1), undef_access },
+ { SYS_DESC(SYS_PMSLATFR_EL1), undef_access },
+ { SYS_DESC(SYS_PMSIDR_EL1), undef_access },
+ { SYS_DESC(SYS_PMBLIMITR_EL1), undef_access },
+ { SYS_DESC(SYS_PMBPTR_EL1), undef_access },
+ { SYS_DESC(SYS_PMBSR_EL1), undef_access },
+ /* PMBIDR_EL1 is not trapped */
+
+ { PMU_SYS_REG(SYS_PMINTENSET_EL1),
+ .access = access_pminten, .reg = PMINTENSET_EL1 },
+ { PMU_SYS_REG(SYS_PMINTENCLR_EL1),
+ .access = access_pminten, .reg = PMINTENSET_EL1 },
+ { SYS_DESC(SYS_PMMIR_EL1), trap_raz_wi },
+
+ { SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 },
+ { SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 },
+
+ { SYS_DESC(SYS_LORSA_EL1), trap_loregion },
+ { SYS_DESC(SYS_LOREA_EL1), trap_loregion },
+ { SYS_DESC(SYS_LORN_EL1), trap_loregion },
+ { SYS_DESC(SYS_LORC_EL1), trap_loregion },
+ { SYS_DESC(SYS_LORID_EL1), trap_loregion },
+
+ { SYS_DESC(SYS_VBAR_EL1), NULL, reset_val, VBAR_EL1, 0 },
+ { SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 },
+
+ { SYS_DESC(SYS_ICC_IAR0_EL1), write_to_read_only },
+ { SYS_DESC(SYS_ICC_EOIR0_EL1), read_from_write_only },
+ { SYS_DESC(SYS_ICC_HPPIR0_EL1), write_to_read_only },
+ { SYS_DESC(SYS_ICC_DIR_EL1), read_from_write_only },
+ { SYS_DESC(SYS_ICC_RPR_EL1), write_to_read_only },
+ { SYS_DESC(SYS_ICC_SGI1R_EL1), access_gic_sgi },
+ { SYS_DESC(SYS_ICC_ASGI1R_EL1), access_gic_sgi },
+ { SYS_DESC(SYS_ICC_SGI0R_EL1), access_gic_sgi },
+ { SYS_DESC(SYS_ICC_IAR1_EL1), write_to_read_only },
+ { SYS_DESC(SYS_ICC_EOIR1_EL1), read_from_write_only },
+ { SYS_DESC(SYS_ICC_HPPIR1_EL1), write_to_read_only },
+ { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre },
+
+ { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 },
+ { SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 },
+
+ { SYS_DESC(SYS_SCXTNUM_EL1), undef_access },
+
+ { SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0},
+
+ { SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr },
+ { SYS_DESC(SYS_CLIDR_EL1), access_clidr },
+ { SYS_DESC(SYS_SMIDR_EL1), undef_access },
+ { SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 },
+ { SYS_DESC(SYS_CTR_EL0), access_ctr },
+ { SYS_DESC(SYS_SVCR), undef_access },
+
+ { PMU_SYS_REG(SYS_PMCR_EL0), .access = access_pmcr,
+ .reset = reset_pmcr, .reg = PMCR_EL0 },
+ { PMU_SYS_REG(SYS_PMCNTENSET_EL0),
+ .access = access_pmcnten, .reg = PMCNTENSET_EL0 },
+ { PMU_SYS_REG(SYS_PMCNTENCLR_EL0),
+ .access = access_pmcnten, .reg = PMCNTENSET_EL0 },
+ { PMU_SYS_REG(SYS_PMOVSCLR_EL0),
+ .access = access_pmovs, .reg = PMOVSSET_EL0 },
+ /*
+ * PM_SWINC_EL0 is exposed to userspace as RAZ/WI, as it was
+ * previously (and pointlessly) advertised in the past...
+ */
+ { PMU_SYS_REG(SYS_PMSWINC_EL0),
+ .get_user = get_raz_reg, .set_user = set_wi_reg,
+ .access = access_pmswinc, .reset = NULL },
+ { PMU_SYS_REG(SYS_PMSELR_EL0),
+ .access = access_pmselr, .reset = reset_pmselr, .reg = PMSELR_EL0 },
+ { PMU_SYS_REG(SYS_PMCEID0_EL0),
+ .access = access_pmceid, .reset = NULL },
+ { PMU_SYS_REG(SYS_PMCEID1_EL0),
+ .access = access_pmceid, .reset = NULL },
+ { PMU_SYS_REG(SYS_PMCCNTR_EL0),
+ .access = access_pmu_evcntr, .reset = reset_unknown,
+ .reg = PMCCNTR_EL0, .get_user = get_pmu_evcntr},
+ { PMU_SYS_REG(SYS_PMXEVTYPER_EL0),
+ .access = access_pmu_evtyper, .reset = NULL },
+ { PMU_SYS_REG(SYS_PMXEVCNTR_EL0),
+ .access = access_pmu_evcntr, .reset = NULL },
+ /*
+ * PMUSERENR_EL0 resets as unknown in 64bit mode while it resets as zero
+ * in 32bit mode. Here we choose to reset it as zero for consistency.
+ */
+ { PMU_SYS_REG(SYS_PMUSERENR_EL0), .access = access_pmuserenr,
+ .reset = reset_val, .reg = PMUSERENR_EL0, .val = 0 },
+ { PMU_SYS_REG(SYS_PMOVSSET_EL0),
+ .access = access_pmovs, .reg = PMOVSSET_EL0 },
+
+ { SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
+ { SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
+ { SYS_DESC(SYS_TPIDR2_EL0), undef_access },
+
+ { SYS_DESC(SYS_SCXTNUM_EL0), undef_access },
+
+ { SYS_DESC(SYS_AMCR_EL0), undef_access },
+ { SYS_DESC(SYS_AMCFGR_EL0), undef_access },
+ { SYS_DESC(SYS_AMCGCR_EL0), undef_access },
+ { SYS_DESC(SYS_AMUSERENR_EL0), undef_access },
+ { SYS_DESC(SYS_AMCNTENCLR0_EL0), undef_access },
+ { SYS_DESC(SYS_AMCNTENSET0_EL0), undef_access },
+ { SYS_DESC(SYS_AMCNTENCLR1_EL0), undef_access },
+ { SYS_DESC(SYS_AMCNTENSET1_EL0), undef_access },
+ AMU_AMEVCNTR0_EL0(0),
+ AMU_AMEVCNTR0_EL0(1),
+ AMU_AMEVCNTR0_EL0(2),
+ AMU_AMEVCNTR0_EL0(3),
+ AMU_AMEVCNTR0_EL0(4),
+ AMU_AMEVCNTR0_EL0(5),
+ AMU_AMEVCNTR0_EL0(6),
+ AMU_AMEVCNTR0_EL0(7),
+ AMU_AMEVCNTR0_EL0(8),
+ AMU_AMEVCNTR0_EL0(9),
+ AMU_AMEVCNTR0_EL0(10),
+ AMU_AMEVCNTR0_EL0(11),
+ AMU_AMEVCNTR0_EL0(12),
+ AMU_AMEVCNTR0_EL0(13),
+ AMU_AMEVCNTR0_EL0(14),
+ AMU_AMEVCNTR0_EL0(15),
+ AMU_AMEVTYPER0_EL0(0),
+ AMU_AMEVTYPER0_EL0(1),
+ AMU_AMEVTYPER0_EL0(2),
+ AMU_AMEVTYPER0_EL0(3),
+ AMU_AMEVTYPER0_EL0(4),
+ AMU_AMEVTYPER0_EL0(5),
+ AMU_AMEVTYPER0_EL0(6),
+ AMU_AMEVTYPER0_EL0(7),
+ AMU_AMEVTYPER0_EL0(8),
+ AMU_AMEVTYPER0_EL0(9),
+ AMU_AMEVTYPER0_EL0(10),
+ AMU_AMEVTYPER0_EL0(11),
+ AMU_AMEVTYPER0_EL0(12),
+ AMU_AMEVTYPER0_EL0(13),
+ AMU_AMEVTYPER0_EL0(14),
+ AMU_AMEVTYPER0_EL0(15),
+ AMU_AMEVCNTR1_EL0(0),
+ AMU_AMEVCNTR1_EL0(1),
+ AMU_AMEVCNTR1_EL0(2),
+ AMU_AMEVCNTR1_EL0(3),
+ AMU_AMEVCNTR1_EL0(4),
+ AMU_AMEVCNTR1_EL0(5),
+ AMU_AMEVCNTR1_EL0(6),
+ AMU_AMEVCNTR1_EL0(7),
+ AMU_AMEVCNTR1_EL0(8),
+ AMU_AMEVCNTR1_EL0(9),
+ AMU_AMEVCNTR1_EL0(10),
+ AMU_AMEVCNTR1_EL0(11),
+ AMU_AMEVCNTR1_EL0(12),
+ AMU_AMEVCNTR1_EL0(13),
+ AMU_AMEVCNTR1_EL0(14),
+ AMU_AMEVCNTR1_EL0(15),
+ AMU_AMEVTYPER1_EL0(0),
+ AMU_AMEVTYPER1_EL0(1),
+ AMU_AMEVTYPER1_EL0(2),
+ AMU_AMEVTYPER1_EL0(3),
+ AMU_AMEVTYPER1_EL0(4),
+ AMU_AMEVTYPER1_EL0(5),
+ AMU_AMEVTYPER1_EL0(6),
+ AMU_AMEVTYPER1_EL0(7),
+ AMU_AMEVTYPER1_EL0(8),
+ AMU_AMEVTYPER1_EL0(9),
+ AMU_AMEVTYPER1_EL0(10),
+ AMU_AMEVTYPER1_EL0(11),
+ AMU_AMEVTYPER1_EL0(12),
+ AMU_AMEVTYPER1_EL0(13),
+ AMU_AMEVTYPER1_EL0(14),
+ AMU_AMEVTYPER1_EL0(15),
+
+ { SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer },
+ { SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer },
+ { SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer },
+
+ /* PMEVCNTRn_EL0 */
+ PMU_PMEVCNTR_EL0(0),
+ PMU_PMEVCNTR_EL0(1),
+ PMU_PMEVCNTR_EL0(2),
+ PMU_PMEVCNTR_EL0(3),
+ PMU_PMEVCNTR_EL0(4),
+ PMU_PMEVCNTR_EL0(5),
+ PMU_PMEVCNTR_EL0(6),
+ PMU_PMEVCNTR_EL0(7),
+ PMU_PMEVCNTR_EL0(8),
+ PMU_PMEVCNTR_EL0(9),
+ PMU_PMEVCNTR_EL0(10),
+ PMU_PMEVCNTR_EL0(11),
+ PMU_PMEVCNTR_EL0(12),
+ PMU_PMEVCNTR_EL0(13),
+ PMU_PMEVCNTR_EL0(14),
+ PMU_PMEVCNTR_EL0(15),
+ PMU_PMEVCNTR_EL0(16),
+ PMU_PMEVCNTR_EL0(17),
+ PMU_PMEVCNTR_EL0(18),
+ PMU_PMEVCNTR_EL0(19),
+ PMU_PMEVCNTR_EL0(20),
+ PMU_PMEVCNTR_EL0(21),
+ PMU_PMEVCNTR_EL0(22),
+ PMU_PMEVCNTR_EL0(23),
+ PMU_PMEVCNTR_EL0(24),
+ PMU_PMEVCNTR_EL0(25),
+ PMU_PMEVCNTR_EL0(26),
+ PMU_PMEVCNTR_EL0(27),
+ PMU_PMEVCNTR_EL0(28),
+ PMU_PMEVCNTR_EL0(29),
+ PMU_PMEVCNTR_EL0(30),
+ /* PMEVTYPERn_EL0 */
+ PMU_PMEVTYPER_EL0(0),
+ PMU_PMEVTYPER_EL0(1),
+ PMU_PMEVTYPER_EL0(2),
+ PMU_PMEVTYPER_EL0(3),
+ PMU_PMEVTYPER_EL0(4),
+ PMU_PMEVTYPER_EL0(5),
+ PMU_PMEVTYPER_EL0(6),
+ PMU_PMEVTYPER_EL0(7),
+ PMU_PMEVTYPER_EL0(8),
+ PMU_PMEVTYPER_EL0(9),
+ PMU_PMEVTYPER_EL0(10),
+ PMU_PMEVTYPER_EL0(11),
+ PMU_PMEVTYPER_EL0(12),
+ PMU_PMEVTYPER_EL0(13),
+ PMU_PMEVTYPER_EL0(14),
+ PMU_PMEVTYPER_EL0(15),
+ PMU_PMEVTYPER_EL0(16),
+ PMU_PMEVTYPER_EL0(17),
+ PMU_PMEVTYPER_EL0(18),
+ PMU_PMEVTYPER_EL0(19),
+ PMU_PMEVTYPER_EL0(20),
+ PMU_PMEVTYPER_EL0(21),
+ PMU_PMEVTYPER_EL0(22),
+ PMU_PMEVTYPER_EL0(23),
+ PMU_PMEVTYPER_EL0(24),
+ PMU_PMEVTYPER_EL0(25),
+ PMU_PMEVTYPER_EL0(26),
+ PMU_PMEVTYPER_EL0(27),
+ PMU_PMEVTYPER_EL0(28),
+ PMU_PMEVTYPER_EL0(29),
+ PMU_PMEVTYPER_EL0(30),
+ /*
+ * PMCCFILTR_EL0 resets as unknown in 64bit mode while it resets as zero
+ * in 32bit mode. Here we choose to reset it as zero for consistency.
+ */
+ { PMU_SYS_REG(SYS_PMCCFILTR_EL0), .access = access_pmu_evtyper,
+ .reset = reset_val, .reg = PMCCFILTR_EL0, .val = 0 },
+
+ { SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 },
+ { SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 },
+ { SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 },
+};
+
+static bool trap_dbgdidr(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *p,
+ const struct sys_reg_desc *r)
+{
+ if (p->is_write) {
+ return ignore_write(vcpu, p);
+ } else {
+ u64 dfr = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1);
+ u64 pfr = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
+ u32 el3 = !!cpuid_feature_extract_unsigned_field(pfr, ID_AA64PFR0_EL1_EL3_SHIFT);
+
+ p->regval = ((((dfr >> ID_AA64DFR0_EL1_WRPs_SHIFT) & 0xf) << 28) |
+ (((dfr >> ID_AA64DFR0_EL1_BRPs_SHIFT) & 0xf) << 24) |
+ (((dfr >> ID_AA64DFR0_EL1_CTX_CMPs_SHIFT) & 0xf) << 20)
+ | (6 << 16) | (1 << 15) | (el3 << 14) | (el3 << 12));
+ return true;
+ }
+}
+
+/*
+ * AArch32 debug register mappings
+ *
+ * AArch32 DBGBVRn is mapped to DBGBVRn_EL1[31:0]
+ * AArch32 DBGBXVRn is mapped to DBGBVRn_EL1[63:32]
+ *
+ * None of the other registers share their location, so treat them as
+ * if they were 64bit.
+ */
+#define DBG_BCR_BVR_WCR_WVR(n) \
+ /* DBGBVRn */ \
+ { AA32(LO), Op1( 0), CRn( 0), CRm((n)), Op2( 4), trap_bvr, NULL, n }, \
+ /* DBGBCRn */ \
+ { Op1( 0), CRn( 0), CRm((n)), Op2( 5), trap_bcr, NULL, n }, \
+ /* DBGWVRn */ \
+ { Op1( 0), CRn( 0), CRm((n)), Op2( 6), trap_wvr, NULL, n }, \
+ /* DBGWCRn */ \
+ { Op1( 0), CRn( 0), CRm((n)), Op2( 7), trap_wcr, NULL, n }
+
+#define DBGBXVR(n) \
+ { AA32(HI), Op1( 0), CRn( 1), CRm((n)), Op2( 1), trap_bvr, NULL, n }
+
+/*
+ * Trapped cp14 registers. We generally ignore most of the external
+ * debug, on the principle that they don't really make sense to a
+ * guest. Revisit this one day, would this principle change.
+ */
+static const struct sys_reg_desc cp14_regs[] = {
+ /* DBGDIDR */
+ { Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgdidr },
+ /* DBGDTRRXext */
+ { Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi },
+
+ DBG_BCR_BVR_WCR_WVR(0),
+ /* DBGDSCRint */
+ { Op1( 0), CRn( 0), CRm( 1), Op2( 0), trap_raz_wi },
+ DBG_BCR_BVR_WCR_WVR(1),
+ /* DBGDCCINT */
+ { Op1( 0), CRn( 0), CRm( 2), Op2( 0), trap_debug_regs, NULL, MDCCINT_EL1 },
+ /* DBGDSCRext */
+ { Op1( 0), CRn( 0), CRm( 2), Op2( 2), trap_debug_regs, NULL, MDSCR_EL1 },
+ DBG_BCR_BVR_WCR_WVR(2),
+ /* DBGDTR[RT]Xint */
+ { Op1( 0), CRn( 0), CRm( 3), Op2( 0), trap_raz_wi },
+ /* DBGDTR[RT]Xext */
+ { Op1( 0), CRn( 0), CRm( 3), Op2( 2), trap_raz_wi },
+ DBG_BCR_BVR_WCR_WVR(3),
+ DBG_BCR_BVR_WCR_WVR(4),
+ DBG_BCR_BVR_WCR_WVR(5),
+ /* DBGWFAR */
+ { Op1( 0), CRn( 0), CRm( 6), Op2( 0), trap_raz_wi },
+ /* DBGOSECCR */
+ { Op1( 0), CRn( 0), CRm( 6), Op2( 2), trap_raz_wi },
+ DBG_BCR_BVR_WCR_WVR(6),
+ /* DBGVCR */
+ { Op1( 0), CRn( 0), CRm( 7), Op2( 0), trap_debug_regs, NULL, DBGVCR32_EL2 },
+ DBG_BCR_BVR_WCR_WVR(7),
+ DBG_BCR_BVR_WCR_WVR(8),
+ DBG_BCR_BVR_WCR_WVR(9),
+ DBG_BCR_BVR_WCR_WVR(10),
+ DBG_BCR_BVR_WCR_WVR(11),
+ DBG_BCR_BVR_WCR_WVR(12),
+ DBG_BCR_BVR_WCR_WVR(13),
+ DBG_BCR_BVR_WCR_WVR(14),
+ DBG_BCR_BVR_WCR_WVR(15),
+
+ /* DBGDRAR (32bit) */
+ { Op1( 0), CRn( 1), CRm( 0), Op2( 0), trap_raz_wi },
+
+ DBGBXVR(0),
+ /* DBGOSLAR */
+ { Op1( 0), CRn( 1), CRm( 0), Op2( 4), trap_oslar_el1 },
+ DBGBXVR(1),
+ /* DBGOSLSR */
+ { Op1( 0), CRn( 1), CRm( 1), Op2( 4), trap_oslsr_el1, NULL, OSLSR_EL1 },
+ DBGBXVR(2),
+ DBGBXVR(3),
+ /* DBGOSDLR */
+ { Op1( 0), CRn( 1), CRm( 3), Op2( 4), trap_raz_wi },
+ DBGBXVR(4),
+ /* DBGPRCR */
+ { Op1( 0), CRn( 1), CRm( 4), Op2( 4), trap_raz_wi },
+ DBGBXVR(5),
+ DBGBXVR(6),
+ DBGBXVR(7),
+ DBGBXVR(8),
+ DBGBXVR(9),
+ DBGBXVR(10),
+ DBGBXVR(11),
+ DBGBXVR(12),
+ DBGBXVR(13),
+ DBGBXVR(14),
+ DBGBXVR(15),
+
+ /* DBGDSAR (32bit) */
+ { Op1( 0), CRn( 2), CRm( 0), Op2( 0), trap_raz_wi },
+
+ /* DBGDEVID2 */
+ { Op1( 0), CRn( 7), CRm( 0), Op2( 7), trap_raz_wi },
+ /* DBGDEVID1 */
+ { Op1( 0), CRn( 7), CRm( 1), Op2( 7), trap_raz_wi },
+ /* DBGDEVID */
+ { Op1( 0), CRn( 7), CRm( 2), Op2( 7), trap_raz_wi },
+ /* DBGCLAIMSET */
+ { Op1( 0), CRn( 7), CRm( 8), Op2( 6), trap_raz_wi },
+ /* DBGCLAIMCLR */
+ { Op1( 0), CRn( 7), CRm( 9), Op2( 6), trap_raz_wi },
+ /* DBGAUTHSTATUS */
+ { Op1( 0), CRn( 7), CRm(14), Op2( 6), trap_dbgauthstatus_el1 },
+};
+
+/* Trapped cp14 64bit registers */
+static const struct sys_reg_desc cp14_64_regs[] = {
+ /* DBGDRAR (64bit) */
+ { Op1( 0), CRm( 1), .access = trap_raz_wi },
+
+ /* DBGDSAR (64bit) */
+ { Op1( 0), CRm( 2), .access = trap_raz_wi },
+};
+
+#define CP15_PMU_SYS_REG(_map, _Op1, _CRn, _CRm, _Op2) \
+ AA32(_map), \
+ Op1(_Op1), CRn(_CRn), CRm(_CRm), Op2(_Op2), \
+ .visibility = pmu_visibility
+
+/* Macro to expand the PMEVCNTRn register */
+#define PMU_PMEVCNTR(n) \
+ { CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \
+ (0b1000 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \
+ .access = access_pmu_evcntr }
+
+/* Macro to expand the PMEVTYPERn register */
+#define PMU_PMEVTYPER(n) \
+ { CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \
+ (0b1100 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \
+ .access = access_pmu_evtyper }
+/*
+ * Trapped cp15 registers. TTBR0/TTBR1 get a double encoding,
+ * depending on the way they are accessed (as a 32bit or a 64bit
+ * register).
+ */
+static const struct sys_reg_desc cp15_regs[] = {
+ { Op1( 0), CRn( 0), CRm( 0), Op2( 1), access_ctr },
+ { Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, SCTLR_EL1 },
+ /* ACTLR */
+ { AA32(LO), Op1( 0), CRn( 1), CRm( 0), Op2( 1), access_actlr, NULL, ACTLR_EL1 },
+ /* ACTLR2 */
+ { AA32(HI), Op1( 0), CRn( 1), CRm( 0), Op2( 3), access_actlr, NULL, ACTLR_EL1 },
+ { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 },
+ { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, TTBR1_EL1 },
+ /* TTBCR */
+ { AA32(LO), Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, TCR_EL1 },
+ /* TTBCR2 */
+ { AA32(HI), Op1( 0), CRn( 2), CRm( 0), Op2( 3), access_vm_reg, NULL, TCR_EL1 },
+ { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, DACR32_EL2 },
+ /* DFSR */
+ { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, ESR_EL1 },
+ { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, IFSR32_EL2 },
+ /* ADFSR */
+ { Op1( 0), CRn( 5), CRm( 1), Op2( 0), access_vm_reg, NULL, AFSR0_EL1 },
+ /* AIFSR */
+ { Op1( 0), CRn( 5), CRm( 1), Op2( 1), access_vm_reg, NULL, AFSR1_EL1 },
+ /* DFAR */
+ { AA32(LO), Op1( 0), CRn( 6), CRm( 0), Op2( 0), access_vm_reg, NULL, FAR_EL1 },
+ /* IFAR */
+ { AA32(HI), Op1( 0), CRn( 6), CRm( 0), Op2( 2), access_vm_reg, NULL, FAR_EL1 },
+
+ /*
+ * DC{C,I,CI}SW operations:
+ */
+ { Op1( 0), CRn( 7), CRm( 6), Op2( 2), access_dcsw },
+ { Op1( 0), CRn( 7), CRm(10), Op2( 2), access_dcsw },
+ { Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw },
+
+ /* PMU */
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 0), .access = access_pmcr },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 1), .access = access_pmcnten },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 2), .access = access_pmcnten },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 3), .access = access_pmovs },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 4), .access = access_pmswinc },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 5), .access = access_pmselr },
+ { CP15_PMU_SYS_REG(LO, 0, 9, 12, 6), .access = access_pmceid },
+ { CP15_PMU_SYS_REG(LO, 0, 9, 12, 7), .access = access_pmceid },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 0), .access = access_pmu_evcntr },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 1), .access = access_pmu_evtyper },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 2), .access = access_pmu_evcntr },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 0), .access = access_pmuserenr },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 1), .access = access_pminten },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 2), .access = access_pminten },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 3), .access = access_pmovs },
+ { CP15_PMU_SYS_REG(HI, 0, 9, 14, 4), .access = access_pmceid },
+ { CP15_PMU_SYS_REG(HI, 0, 9, 14, 5), .access = access_pmceid },
+ /* PMMIR */
+ { CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 6), .access = trap_raz_wi },
+
+ /* PRRR/MAIR0 */
+ { AA32(LO), Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, MAIR_EL1 },
+ /* NMRR/MAIR1 */
+ { AA32(HI), Op1( 0), CRn(10), CRm( 2), Op2( 1), access_vm_reg, NULL, MAIR_EL1 },
+ /* AMAIR0 */
+ { AA32(LO), Op1( 0), CRn(10), CRm( 3), Op2( 0), access_vm_reg, NULL, AMAIR_EL1 },
+ /* AMAIR1 */
+ { AA32(HI), Op1( 0), CRn(10), CRm( 3), Op2( 1), access_vm_reg, NULL, AMAIR_EL1 },
+
+ /* ICC_SRE */
+ { Op1( 0), CRn(12), CRm(12), Op2( 5), access_gic_sre },
+
+ { Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, CONTEXTIDR_EL1 },
+
+ /* Arch Tmers */
+ { SYS_DESC(SYS_AARCH32_CNTP_TVAL), access_arch_timer },
+ { SYS_DESC(SYS_AARCH32_CNTP_CTL), access_arch_timer },
+
+ /* PMEVCNTRn */
+ PMU_PMEVCNTR(0),
+ PMU_PMEVCNTR(1),
+ PMU_PMEVCNTR(2),
+ PMU_PMEVCNTR(3),
+ PMU_PMEVCNTR(4),
+ PMU_PMEVCNTR(5),
+ PMU_PMEVCNTR(6),
+ PMU_PMEVCNTR(7),
+ PMU_PMEVCNTR(8),
+ PMU_PMEVCNTR(9),
+ PMU_PMEVCNTR(10),
+ PMU_PMEVCNTR(11),
+ PMU_PMEVCNTR(12),
+ PMU_PMEVCNTR(13),
+ PMU_PMEVCNTR(14),
+ PMU_PMEVCNTR(15),
+ PMU_PMEVCNTR(16),
+ PMU_PMEVCNTR(17),
+ PMU_PMEVCNTR(18),
+ PMU_PMEVCNTR(19),
+ PMU_PMEVCNTR(20),
+ PMU_PMEVCNTR(21),
+ PMU_PMEVCNTR(22),
+ PMU_PMEVCNTR(23),
+ PMU_PMEVCNTR(24),
+ PMU_PMEVCNTR(25),
+ PMU_PMEVCNTR(26),
+ PMU_PMEVCNTR(27),
+ PMU_PMEVCNTR(28),
+ PMU_PMEVCNTR(29),
+ PMU_PMEVCNTR(30),
+ /* PMEVTYPERn */
+ PMU_PMEVTYPER(0),
+ PMU_PMEVTYPER(1),
+ PMU_PMEVTYPER(2),
+ PMU_PMEVTYPER(3),
+ PMU_PMEVTYPER(4),
+ PMU_PMEVTYPER(5),
+ PMU_PMEVTYPER(6),
+ PMU_PMEVTYPER(7),
+ PMU_PMEVTYPER(8),
+ PMU_PMEVTYPER(9),
+ PMU_PMEVTYPER(10),
+ PMU_PMEVTYPER(11),
+ PMU_PMEVTYPER(12),
+ PMU_PMEVTYPER(13),
+ PMU_PMEVTYPER(14),
+ PMU_PMEVTYPER(15),
+ PMU_PMEVTYPER(16),
+ PMU_PMEVTYPER(17),
+ PMU_PMEVTYPER(18),
+ PMU_PMEVTYPER(19),
+ PMU_PMEVTYPER(20),
+ PMU_PMEVTYPER(21),
+ PMU_PMEVTYPER(22),
+ PMU_PMEVTYPER(23),
+ PMU_PMEVTYPER(24),
+ PMU_PMEVTYPER(25),
+ PMU_PMEVTYPER(26),
+ PMU_PMEVTYPER(27),
+ PMU_PMEVTYPER(28),
+ PMU_PMEVTYPER(29),
+ PMU_PMEVTYPER(30),
+ /* PMCCFILTR */
+ { CP15_PMU_SYS_REG(DIRECT, 0, 14, 15, 7), .access = access_pmu_evtyper },
+
+ { Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr },
+ { Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr },
+ { Op1(2), CRn( 0), CRm( 0), Op2(0), access_csselr, NULL, CSSELR_EL1 },
+};
+
+static const struct sys_reg_desc cp15_64_regs[] = {
+ { Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 },
+ { CP15_PMU_SYS_REG(DIRECT, 0, 0, 9, 0), .access = access_pmu_evcntr },
+ { Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */
+ { Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR1_EL1 },
+ { Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */
+ { Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */
+ { SYS_DESC(SYS_AARCH32_CNTP_CVAL), access_arch_timer },
+};
+
+static bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n,
+ bool is_32)
+{
+ unsigned int i;
+
+ for (i = 0; i < n; i++) {
+ if (!is_32 && table[i].reg && !table[i].reset) {
+ kvm_err("sys_reg table %pS entry %d lacks reset\n", &table[i], i);
+ return false;
+ }
+
+ if (i && cmp_sys_reg(&table[i-1], &table[i]) >= 0) {
+ kvm_err("sys_reg table %pS entry %d out of order\n", &table[i - 1], i - 1);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu)
+{
+ kvm_inject_undefined(vcpu);
+ return 1;
+}
+
+static void perform_access(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params,
+ const struct sys_reg_desc *r)
+{
+ trace_kvm_sys_access(*vcpu_pc(vcpu), params, r);
+
+ /* Check for regs disabled by runtime config */
+ if (sysreg_hidden(vcpu, r)) {
+ kvm_inject_undefined(vcpu);
+ return;
+ }
+
+ /*
+ * Not having an accessor means that we have configured a trap
+ * that we don't know how to handle. This certainly qualifies
+ * as a gross bug that should be fixed right away.
+ */
+ BUG_ON(!r->access);
+
+ /* Skip instruction if instructed so */
+ if (likely(r->access(vcpu, params, r)))
+ kvm_incr_pc(vcpu);
+}
+
+/*
+ * emulate_cp -- tries to match a sys_reg access in a handling table, and
+ * call the corresponding trap handler.
+ *
+ * @params: pointer to the descriptor of the access
+ * @table: array of trap descriptors
+ * @num: size of the trap descriptor array
+ *
+ * Return true if the access has been handled, false if not.
+ */
+static bool emulate_cp(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params,
+ const struct sys_reg_desc *table,
+ size_t num)
+{
+ const struct sys_reg_desc *r;
+
+ if (!table)
+ return false; /* Not handled */
+
+ r = find_reg(params, table, num);
+
+ if (r) {
+ perform_access(vcpu, params, r);
+ return true;
+ }
+
+ /* Not handled */
+ return false;
+}
+
+static void unhandled_cp_access(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params)
+{
+ u8 esr_ec = kvm_vcpu_trap_get_class(vcpu);
+ int cp = -1;
+
+ switch (esr_ec) {
+ case ESR_ELx_EC_CP15_32:
+ case ESR_ELx_EC_CP15_64:
+ cp = 15;
+ break;
+ case ESR_ELx_EC_CP14_MR:
+ case ESR_ELx_EC_CP14_64:
+ cp = 14;
+ break;
+ default:
+ WARN_ON(1);
+ }
+
+ print_sys_reg_msg(params,
+ "Unsupported guest CP%d access at: %08lx [%08lx]\n",
+ cp, *vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
+ kvm_inject_undefined(vcpu);
+}
+
+/**
+ * kvm_handle_cp_64 -- handles a mrrc/mcrr trap on a guest CP14/CP15 access
+ * @vcpu: The VCPU pointer
+ * @run: The kvm_run struct
+ */
+static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *global,
+ size_t nr_global)
+{
+ struct sys_reg_params params;
+ u64 esr = kvm_vcpu_get_esr(vcpu);
+ int Rt = kvm_vcpu_sys_get_rt(vcpu);
+ int Rt2 = (esr >> 10) & 0x1f;
+
+ params.CRm = (esr >> 1) & 0xf;
+ params.is_write = ((esr & 1) == 0);
+
+ params.Op0 = 0;
+ params.Op1 = (esr >> 16) & 0xf;
+ params.Op2 = 0;
+ params.CRn = 0;
+
+ /*
+ * Make a 64-bit value out of Rt and Rt2. As we use the same trap
+ * backends between AArch32 and AArch64, we get away with it.
+ */
+ if (params.is_write) {
+ params.regval = vcpu_get_reg(vcpu, Rt) & 0xffffffff;
+ params.regval |= vcpu_get_reg(vcpu, Rt2) << 32;
+ }
+
+ /*
+ * If the table contains a handler, handle the
+ * potential register operation in the case of a read and return
+ * with success.
+ */
+ if (emulate_cp(vcpu, &params, global, nr_global)) {
+ /* Split up the value between registers for the read side */
+ if (!params.is_write) {
+ vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
+ vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval));
+ }
+
+ return 1;
+ }
+
+ unhandled_cp_access(vcpu, &params);
+ return 1;
+}
+
+static bool emulate_sys_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *params);
+
+/*
+ * The CP10 ID registers are architecturally mapped to AArch64 feature
+ * registers. Abuse that fact so we can rely on the AArch64 handler for accesses
+ * from AArch32.
+ */
+static bool kvm_esr_cp10_id_to_sys64(u64 esr, struct sys_reg_params *params)
+{
+ u8 reg_id = (esr >> 10) & 0xf;
+ bool valid;
+
+ params->is_write = ((esr & 1) == 0);
+ params->Op0 = 3;
+ params->Op1 = 0;
+ params->CRn = 0;
+ params->CRm = 3;
+
+ /* CP10 ID registers are read-only */
+ valid = !params->is_write;
+
+ switch (reg_id) {
+ /* MVFR0 */
+ case 0b0111:
+ params->Op2 = 0;
+ break;
+ /* MVFR1 */
+ case 0b0110:
+ params->Op2 = 1;
+ break;
+ /* MVFR2 */
+ case 0b0101:
+ params->Op2 = 2;
+ break;
+ default:
+ valid = false;
+ }
+
+ if (valid)
+ return true;
+
+ kvm_pr_unimpl("Unhandled cp10 register %s: %u\n",
+ params->is_write ? "write" : "read", reg_id);
+ return false;
+}
+
+/**
+ * kvm_handle_cp10_id() - Handles a VMRS trap on guest access to a 'Media and
+ * VFP Register' from AArch32.
+ * @vcpu: The vCPU pointer
+ *
+ * MVFR{0-2} are architecturally mapped to the AArch64 MVFR{0-2}_EL1 registers.
+ * Work out the correct AArch64 system register encoding and reroute to the
+ * AArch64 system register emulation.
+ */
+int kvm_handle_cp10_id(struct kvm_vcpu *vcpu)
+{
+ int Rt = kvm_vcpu_sys_get_rt(vcpu);
+ u64 esr = kvm_vcpu_get_esr(vcpu);
+ struct sys_reg_params params;
+
+ /* UNDEF on any unhandled register access */
+ if (!kvm_esr_cp10_id_to_sys64(esr, &params)) {
+ kvm_inject_undefined(vcpu);
+ return 1;
+ }
+
+ if (emulate_sys_reg(vcpu, &params))
+ vcpu_set_reg(vcpu, Rt, params.regval);
+
+ return 1;
+}
+
+/**
+ * kvm_emulate_cp15_id_reg() - Handles an MRC trap on a guest CP15 access where
+ * CRn=0, which corresponds to the AArch32 feature
+ * registers.
+ * @vcpu: the vCPU pointer
+ * @params: the system register access parameters.
+ *
+ * Our cp15 system register tables do not enumerate the AArch32 feature
+ * registers. Conveniently, our AArch64 table does, and the AArch32 system
+ * register encoding can be trivially remapped into the AArch64 for the feature
+ * registers: Append op0=3, leaving op1, CRn, CRm, and op2 the same.
+ *
+ * According to DDI0487G.b G7.3.1, paragraph "Behavior of VMSAv8-32 32-bit
+ * System registers with (coproc=0b1111, CRn==c0)", read accesses from this
+ * range are either UNKNOWN or RES0. Rerouting remains architectural as we
+ * treat undefined registers in this range as RAZ.
+ */
+static int kvm_emulate_cp15_id_reg(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params)
+{
+ int Rt = kvm_vcpu_sys_get_rt(vcpu);
+
+ /* Treat impossible writes to RO registers as UNDEFINED */
+ if (params->is_write) {
+ unhandled_cp_access(vcpu, params);
+ return 1;
+ }
+
+ params->Op0 = 3;
+
+ /*
+ * All registers where CRm > 3 are known to be UNKNOWN/RAZ from AArch32.
+ * Avoid conflicting with future expansion of AArch64 feature registers
+ * and simply treat them as RAZ here.
+ */
+ if (params->CRm > 3)
+ params->regval = 0;
+ else if (!emulate_sys_reg(vcpu, params))
+ return 1;
+
+ vcpu_set_reg(vcpu, Rt, params->regval);
+ return 1;
+}
+
+/**
+ * kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access
+ * @vcpu: The VCPU pointer
+ * @run: The kvm_run struct
+ */
+static int kvm_handle_cp_32(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params,
+ const struct sys_reg_desc *global,
+ size_t nr_global)
+{
+ int Rt = kvm_vcpu_sys_get_rt(vcpu);
+
+ params->regval = vcpu_get_reg(vcpu, Rt);
+
+ if (emulate_cp(vcpu, params, global, nr_global)) {
+ if (!params->is_write)
+ vcpu_set_reg(vcpu, Rt, params->regval);
+ return 1;
+ }
+
+ unhandled_cp_access(vcpu, params);
+ return 1;
+}
+
+int kvm_handle_cp15_64(struct kvm_vcpu *vcpu)
+{
+ return kvm_handle_cp_64(vcpu, cp15_64_regs, ARRAY_SIZE(cp15_64_regs));
+}
+
+int kvm_handle_cp15_32(struct kvm_vcpu *vcpu)
+{
+ struct sys_reg_params params;
+
+ params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu));
+
+ /*
+ * Certain AArch32 ID registers are handled by rerouting to the AArch64
+ * system register table. Registers in the ID range where CRm=0 are
+ * excluded from this scheme as they do not trivially map into AArch64
+ * system register encodings.
+ */
+ if (params.Op1 == 0 && params.CRn == 0 && params.CRm)
+ return kvm_emulate_cp15_id_reg(vcpu, &params);
+
+ return kvm_handle_cp_32(vcpu, &params, cp15_regs, ARRAY_SIZE(cp15_regs));
+}
+
+int kvm_handle_cp14_64(struct kvm_vcpu *vcpu)
+{
+ return kvm_handle_cp_64(vcpu, cp14_64_regs, ARRAY_SIZE(cp14_64_regs));
+}
+
+int kvm_handle_cp14_32(struct kvm_vcpu *vcpu)
+{
+ struct sys_reg_params params;
+
+ params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu));
+
+ return kvm_handle_cp_32(vcpu, &params, cp14_regs, ARRAY_SIZE(cp14_regs));
+}
+
+static bool is_imp_def_sys_reg(struct sys_reg_params *params)
+{
+ // See ARM DDI 0487E.a, section D12.3.2
+ return params->Op0 == 3 && (params->CRn & 0b1011) == 0b1011;
+}
+
+/**
+ * emulate_sys_reg - Emulate a guest access to an AArch64 system register
+ * @vcpu: The VCPU pointer
+ * @params: Decoded system register parameters
+ *
+ * Return: true if the system register access was successful, false otherwise.
+ */
+static bool emulate_sys_reg(struct kvm_vcpu *vcpu,
+ struct sys_reg_params *params)
+{
+ const struct sys_reg_desc *r;
+
+ r = find_reg(params, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
+
+ if (likely(r)) {
+ perform_access(vcpu, params, r);
+ return true;
+ }
+
+ if (is_imp_def_sys_reg(params)) {
+ kvm_inject_undefined(vcpu);
+ } else {
+ print_sys_reg_msg(params,
+ "Unsupported guest sys_reg access at: %lx [%08lx]\n",
+ *vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
+ kvm_inject_undefined(vcpu);
+ }
+ return false;
+}
+
+/**
+ * kvm_reset_sys_regs - sets system registers to reset value
+ * @vcpu: The VCPU pointer
+ *
+ * This function finds the right table above and sets the registers on the
+ * virtual CPU struct to their architecturally defined reset values.
+ */
+void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
+{
+ unsigned long i;
+
+ for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++)
+ if (sys_reg_descs[i].reset)
+ sys_reg_descs[i].reset(vcpu, &sys_reg_descs[i]);
+}
+
+/**
+ * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access
+ * @vcpu: The VCPU pointer
+ */
+int kvm_handle_sys_reg(struct kvm_vcpu *vcpu)
+{
+ struct sys_reg_params params;
+ unsigned long esr = kvm_vcpu_get_esr(vcpu);
+ int Rt = kvm_vcpu_sys_get_rt(vcpu);
+
+ trace_kvm_handle_sys_reg(esr);
+
+ params = esr_sys64_to_params(esr);
+ params.regval = vcpu_get_reg(vcpu, Rt);
+
+ if (!emulate_sys_reg(vcpu, &params))
+ return 1;
+
+ if (!params.is_write)
+ vcpu_set_reg(vcpu, Rt, params.regval);
+ return 1;
+}
+
+/******************************************************************************
+ * Userspace API
+ *****************************************************************************/
+
+static bool index_to_params(u64 id, struct sys_reg_params *params)
+{
+ switch (id & KVM_REG_SIZE_MASK) {
+ case KVM_REG_SIZE_U64:
+ /* Any unused index bits means it's not valid. */
+ if (id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK
+ | KVM_REG_ARM_COPROC_MASK
+ | KVM_REG_ARM64_SYSREG_OP0_MASK
+ | KVM_REG_ARM64_SYSREG_OP1_MASK
+ | KVM_REG_ARM64_SYSREG_CRN_MASK
+ | KVM_REG_ARM64_SYSREG_CRM_MASK
+ | KVM_REG_ARM64_SYSREG_OP2_MASK))
+ return false;
+ params->Op0 = ((id & KVM_REG_ARM64_SYSREG_OP0_MASK)
+ >> KVM_REG_ARM64_SYSREG_OP0_SHIFT);
+ params->Op1 = ((id & KVM_REG_ARM64_SYSREG_OP1_MASK)
+ >> KVM_REG_ARM64_SYSREG_OP1_SHIFT);
+ params->CRn = ((id & KVM_REG_ARM64_SYSREG_CRN_MASK)
+ >> KVM_REG_ARM64_SYSREG_CRN_SHIFT);
+ params->CRm = ((id & KVM_REG_ARM64_SYSREG_CRM_MASK)
+ >> KVM_REG_ARM64_SYSREG_CRM_SHIFT);
+ params->Op2 = ((id & KVM_REG_ARM64_SYSREG_OP2_MASK)
+ >> KVM_REG_ARM64_SYSREG_OP2_SHIFT);
+ return true;
+ default:
+ return false;
+ }
+}
+
+const struct sys_reg_desc *get_reg_by_id(u64 id,
+ const struct sys_reg_desc table[],
+ unsigned int num)
+{
+ struct sys_reg_params params;
+
+ if (!index_to_params(id, &params))
+ return NULL;
+
+ return find_reg(&params, table, num);
+}
+
+/* Decode an index value, and find the sys_reg_desc entry. */
+static const struct sys_reg_desc *
+id_to_sys_reg_desc(struct kvm_vcpu *vcpu, u64 id,
+ const struct sys_reg_desc table[], unsigned int num)
+
+{
+ const struct sys_reg_desc *r;
+
+ /* We only do sys_reg for now. */
+ if ((id & KVM_REG_ARM_COPROC_MASK) != KVM_REG_ARM64_SYSREG)
+ return NULL;
+
+ r = get_reg_by_id(id, table, num);
+
+ /* Not saved in the sys_reg array and not otherwise accessible? */
+ if (r && (!(r->reg || r->get_user) || sysreg_hidden(vcpu, r)))
+ r = NULL;
+
+ return r;
+}
+
+/*
+ * These are the invariant sys_reg registers: we let the guest see the
+ * host versions of these, so they're part of the guest state.
+ *
+ * A future CPU may provide a mechanism to present different values to
+ * the guest, or a future kvm may trap them.
+ */
+
+#define FUNCTION_INVARIANT(reg) \
+ static void get_##reg(struct kvm_vcpu *v, \
+ const struct sys_reg_desc *r) \
+ { \
+ ((struct sys_reg_desc *)r)->val = read_sysreg(reg); \
+ }
+
+FUNCTION_INVARIANT(midr_el1)
+FUNCTION_INVARIANT(revidr_el1)
+FUNCTION_INVARIANT(clidr_el1)
+FUNCTION_INVARIANT(aidr_el1)
+
+static void get_ctr_el0(struct kvm_vcpu *v, const struct sys_reg_desc *r)
+{
+ ((struct sys_reg_desc *)r)->val = read_sanitised_ftr_reg(SYS_CTR_EL0);
+}
+
+/* ->val is filled in by kvm_sys_reg_table_init() */
+static struct sys_reg_desc invariant_sys_regs[] = {
+ { SYS_DESC(SYS_MIDR_EL1), NULL, get_midr_el1 },
+ { SYS_DESC(SYS_REVIDR_EL1), NULL, get_revidr_el1 },
+ { SYS_DESC(SYS_CLIDR_EL1), NULL, get_clidr_el1 },
+ { SYS_DESC(SYS_AIDR_EL1), NULL, get_aidr_el1 },
+ { SYS_DESC(SYS_CTR_EL0), NULL, get_ctr_el0 },
+};
+
+static int get_invariant_sys_reg(u64 id, u64 __user *uaddr)
+{
+ const struct sys_reg_desc *r;
+
+ r = get_reg_by_id(id, invariant_sys_regs,
+ ARRAY_SIZE(invariant_sys_regs));
+ if (!r)
+ return -ENOENT;
+
+ return put_user(r->val, uaddr);
+}
+
+static int set_invariant_sys_reg(u64 id, u64 __user *uaddr)
+{
+ const struct sys_reg_desc *r;
+ u64 val;
+
+ r = get_reg_by_id(id, invariant_sys_regs,
+ ARRAY_SIZE(invariant_sys_regs));
+ if (!r)
+ return -ENOENT;
+
+ if (get_user(val, uaddr))
+ return -EFAULT;
+
+ /* This is what we mean by invariant: you can't change it. */
+ if (r->val != val)
+ return -EINVAL;
+
+ return 0;
+}
+
+static bool is_valid_cache(u32 val)
+{
+ u32 level, ctype;
+
+ if (val >= CSSELR_MAX)
+ return false;
+
+ /* Bottom bit is Instruction or Data bit. Next 3 bits are level. */
+ level = (val >> 1);
+ ctype = (cache_levels >> (level * 3)) & 7;
+
+ switch (ctype) {
+ case 0: /* No cache */
+ return false;
+ case 1: /* Instruction cache only */
+ return (val & 1);
+ case 2: /* Data cache only */
+ case 4: /* Unified cache */
+ return !(val & 1);
+ case 3: /* Separate instruction and data caches */
+ return true;
+ default: /* Reserved: we can't know instruction or data. */
+ return false;
+ }
+}
+
+static int demux_c15_get(u64 id, void __user *uaddr)
+{
+ u32 val;
+ u32 __user *uval = uaddr;
+
+ /* Fail if we have unknown bits set. */
+ if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
+ | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
+ return -ENOENT;
+
+ switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
+ case KVM_REG_ARM_DEMUX_ID_CCSIDR:
+ if (KVM_REG_SIZE(id) != 4)
+ return -ENOENT;
+ val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
+ >> KVM_REG_ARM_DEMUX_VAL_SHIFT;
+ if (!is_valid_cache(val))
+ return -ENOENT;
+
+ return put_user(get_ccsidr(val), uval);
+ default:
+ return -ENOENT;
+ }
+}
+
+static int demux_c15_set(u64 id, void __user *uaddr)
+{
+ u32 val, newval;
+ u32 __user *uval = uaddr;
+
+ /* Fail if we have unknown bits set. */
+ if (id & ~(KVM_REG_ARCH_MASK|KVM_REG_SIZE_MASK|KVM_REG_ARM_COPROC_MASK
+ | ((1 << KVM_REG_ARM_COPROC_SHIFT)-1)))
+ return -ENOENT;
+
+ switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
+ case KVM_REG_ARM_DEMUX_ID_CCSIDR:
+ if (KVM_REG_SIZE(id) != 4)
+ return -ENOENT;
+ val = (id & KVM_REG_ARM_DEMUX_VAL_MASK)
+ >> KVM_REG_ARM_DEMUX_VAL_SHIFT;
+ if (!is_valid_cache(val))
+ return -ENOENT;
+
+ if (get_user(newval, uval))
+ return -EFAULT;
+
+ /* This is also invariant: you can't change it. */
+ if (newval != get_ccsidr(val))
+ return -EINVAL;
+ return 0;
+ default:
+ return -ENOENT;
+ }
+}
+
+int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
+ const struct sys_reg_desc table[], unsigned int num)
+{
+ u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr;
+ const struct sys_reg_desc *r;
+ u64 val;
+ int ret;
+
+ r = id_to_sys_reg_desc(vcpu, reg->id, table, num);
+ if (!r)
+ return -ENOENT;
+
+ if (r->get_user) {
+ ret = (r->get_user)(vcpu, r, &val);
+ } else {
+ val = __vcpu_sys_reg(vcpu, r->reg);
+ ret = 0;
+ }
+
+ if (!ret)
+ ret = put_user(val, uaddr);
+
+ return ret;
+}
+
+int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ void __user *uaddr = (void __user *)(unsigned long)reg->addr;
+ int err;
+
+ if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
+ return demux_c15_get(reg->id, uaddr);
+
+ err = get_invariant_sys_reg(reg->id, uaddr);
+ if (err != -ENOENT)
+ return err;
+
+ return kvm_sys_reg_get_user(vcpu, reg,
+ sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
+}
+
+int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
+ const struct sys_reg_desc table[], unsigned int num)
+{
+ u64 __user *uaddr = (u64 __user *)(unsigned long)reg->addr;
+ const struct sys_reg_desc *r;
+ u64 val;
+ int ret;
+
+ if (get_user(val, uaddr))
+ return -EFAULT;
+
+ r = id_to_sys_reg_desc(vcpu, reg->id, table, num);
+ if (!r)
+ return -ENOENT;
+
+ if (sysreg_user_write_ignore(vcpu, r))
+ return 0;
+
+ if (r->set_user) {
+ ret = (r->set_user)(vcpu, r, val);
+ } else {
+ __vcpu_sys_reg(vcpu, r->reg) = val;
+ ret = 0;
+ }
+
+ return ret;
+}
+
+int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ void __user *uaddr = (void __user *)(unsigned long)reg->addr;
+ int err;
+
+ if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_DEMUX)
+ return demux_c15_set(reg->id, uaddr);
+
+ err = set_invariant_sys_reg(reg->id, uaddr);
+ if (err != -ENOENT)
+ return err;
+
+ return kvm_sys_reg_set_user(vcpu, reg,
+ sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
+}
+
+static unsigned int num_demux_regs(void)
+{
+ unsigned int i, count = 0;
+
+ for (i = 0; i < CSSELR_MAX; i++)
+ if (is_valid_cache(i))
+ count++;
+
+ return count;
+}
+
+static int write_demux_regids(u64 __user *uindices)
+{
+ u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX;
+ unsigned int i;
+
+ val |= KVM_REG_ARM_DEMUX_ID_CCSIDR;
+ for (i = 0; i < CSSELR_MAX; i++) {
+ if (!is_valid_cache(i))
+ continue;
+ if (put_user(val | i, uindices))
+ return -EFAULT;
+ uindices++;
+ }
+ return 0;
+}
+
+static u64 sys_reg_to_index(const struct sys_reg_desc *reg)
+{
+ return (KVM_REG_ARM64 | KVM_REG_SIZE_U64 |
+ KVM_REG_ARM64_SYSREG |
+ (reg->Op0 << KVM_REG_ARM64_SYSREG_OP0_SHIFT) |
+ (reg->Op1 << KVM_REG_ARM64_SYSREG_OP1_SHIFT) |
+ (reg->CRn << KVM_REG_ARM64_SYSREG_CRN_SHIFT) |
+ (reg->CRm << KVM_REG_ARM64_SYSREG_CRM_SHIFT) |
+ (reg->Op2 << KVM_REG_ARM64_SYSREG_OP2_SHIFT));
+}
+
+static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **uind)
+{
+ if (!*uind)
+ return true;
+
+ if (put_user(sys_reg_to_index(reg), *uind))
+ return false;
+
+ (*uind)++;
+ return true;
+}
+
+static int walk_one_sys_reg(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd,
+ u64 __user **uind,
+ unsigned int *total)
+{
+ /*
+ * Ignore registers we trap but don't save,
+ * and for which no custom user accessor is provided.
+ */
+ if (!(rd->reg || rd->get_user))
+ return 0;
+
+ if (sysreg_hidden(vcpu, rd))
+ return 0;
+
+ if (!copy_reg_to_user(rd, uind))
+ return -EFAULT;
+
+ (*total)++;
+ return 0;
+}
+
+/* Assumed ordered tables, see kvm_sys_reg_table_init. */
+static int walk_sys_regs(struct kvm_vcpu *vcpu, u64 __user *uind)
+{
+ const struct sys_reg_desc *i2, *end2;
+ unsigned int total = 0;
+ int err;
+
+ i2 = sys_reg_descs;
+ end2 = sys_reg_descs + ARRAY_SIZE(sys_reg_descs);
+
+ while (i2 != end2) {
+ err = walk_one_sys_reg(vcpu, i2++, &uind, &total);
+ if (err)
+ return err;
+ }
+ return total;
+}
+
+unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu)
+{
+ return ARRAY_SIZE(invariant_sys_regs)
+ + num_demux_regs()
+ + walk_sys_regs(vcpu, (u64 __user *)NULL);
+}
+
+int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
+{
+ unsigned int i;
+ int err;
+
+ /* Then give them all the invariant registers' indices. */
+ for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) {
+ if (put_user(sys_reg_to_index(&invariant_sys_regs[i]), uindices))
+ return -EFAULT;
+ uindices++;
+ }
+
+ err = walk_sys_regs(vcpu, uindices);
+ if (err < 0)
+ return err;
+ uindices += err;
+
+ return write_demux_regids(uindices);
+}
+
+int kvm_sys_reg_table_init(void)
+{
+ bool valid = true;
+ unsigned int i;
+ struct sys_reg_desc clidr;
+
+ /* Make sure tables are unique and in order. */
+ valid &= check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs), false);
+ valid &= check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs), true);
+ valid &= check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs), true);
+ valid &= check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true);
+ valid &= check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true);
+ valid &= check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false);
+
+ if (!valid)
+ return -EINVAL;
+
+ /* We abuse the reset function to overwrite the table itself. */
+ for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++)
+ invariant_sys_regs[i].reset(NULL, &invariant_sys_regs[i]);
+
+ /*
+ * CLIDR format is awkward, so clean it up. See ARM B4.1.20:
+ *
+ * If software reads the Cache Type fields from Ctype1
+ * upwards, once it has seen a value of 0b000, no caches
+ * exist at further-out levels of the hierarchy. So, for
+ * example, if Ctype3 is the first Cache Type field with a
+ * value of 0b000, the values of Ctype4 to Ctype7 must be
+ * ignored.
+ */
+ get_clidr_el1(NULL, &clidr); /* Ugly... */
+ cache_levels = clidr.val;
+ for (i = 0; i < 7; i++)
+ if (((cache_levels >> (i*3)) & 7) == 0)
+ break;
+ /* Clear all higher bits. */
+ cache_levels &= (1 << (i*3))-1;
+
+ return 0;
+}