[PATCH v3 1/6] KVM: arm64: Move CPU ID feature registers emulation into a separate file
Jing Zhang
jingzhangos at google.com
Mon Feb 27 22:22:41 PST 2023
Create a new file id_regs.c for CPU ID feature registers emulation code,
which are moved from sys_regs.c and tweak sys_regs code accordingly.
No functional change intended.
Signed-off-by: Jing Zhang <jingzhangos at google.com>
---
arch/arm64/kvm/Makefile | 2 +-
arch/arm64/kvm/id_regs.c | 506 ++++++++++++++++++++++++++++++++++++++
arch/arm64/kvm/sys_regs.c | 464 ++--------------------------------
arch/arm64/kvm/sys_regs.h | 41 +++
4 files changed, 575 insertions(+), 438 deletions(-)
create mode 100644 arch/arm64/kvm/id_regs.c
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index c0c050e53157..a6a315fcd81e 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_KVM) += hyp/
kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \
inject_fault.o va_layout.o handle_exit.o \
guest.o debug.o reset.o sys_regs.o stacktrace.o \
- vgic-sys-reg-v3.o fpsimd.o pkvm.o \
+ vgic-sys-reg-v3.o fpsimd.o pkvm.o id_regs.o \
arch_timer.o trng.o vmid.o emulate-nested.o nested.o \
vgic/vgic.o vgic/vgic-init.o \
vgic/vgic-irqfd.o vgic/vgic-v2.o \
diff --git a/arch/arm64/kvm/id_regs.c b/arch/arm64/kvm/id_regs.c
new file mode 100644
index 000000000000..08b738852955
--- /dev/null
+++ b/arch/arm64/kvm/id_regs.c
@@ -0,0 +1,506 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 - Google LLC
+ * Author: Jing Zhang <jingzhangos at google.com>
+ *
+ * Moved from arch/arm64/kvm/sys_regs.c
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier at arm.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bsearch.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/sysreg.h>
+#include <asm/cpufeature.h>
+#include <asm/kvm_nested.h>
+
+#include "sys_regs.h"
+
+static u8 vcpu_pmuver(const struct kvm_vcpu *vcpu)
+{
+ if (kvm_vcpu_has_pmu(vcpu))
+ return vcpu->kvm->arch.dfr0_pmuver.imp;
+
+ return vcpu->kvm->arch.dfr0_pmuver.unimp;
+}
+
+static u8 perfmon_to_pmuver(u8 perfmon)
+{
+ switch (perfmon) {
+ case ID_DFR0_EL1_PerfMon_PMUv3:
+ return ID_AA64DFR0_EL1_PMUVer_IMP;
+ case ID_DFR0_EL1_PerfMon_IMPDEF:
+ return ID_AA64DFR0_EL1_PMUVer_IMP_DEF;
+ default:
+ /* Anything ARMv8.1+ and NI have the same value. For now. */
+ return perfmon;
+ }
+}
+
+static u8 pmuver_to_perfmon(u8 pmuver)
+{
+ switch (pmuver) {
+ case ID_AA64DFR0_EL1_PMUVer_IMP:
+ return ID_DFR0_EL1_PerfMon_PMUv3;
+ case ID_AA64DFR0_EL1_PMUVer_IMP_DEF:
+ return ID_DFR0_EL1_PerfMon_IMPDEF;
+ default:
+ /* Anything ARMv8.1+ and NI have the same value. For now. */
+ return pmuver;
+ }
+}
+
+/* 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);
+ /* Set PMUver to the required version */
+ val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer);
+ val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer),
+ vcpu_pmuver(vcpu));
+ /* Hide SPE from guests */
+ val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMSVer);
+ break;
+ case SYS_ID_DFR0_EL1:
+ val &= ~ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon);
+ val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon),
+ pmuver_to_perfmon(vcpu_pmuver(vcpu)));
+ break;
+ case SYS_ID_AA64MMFR2_EL1:
+ val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
+ break;
+ case SYS_ID_MMFR4_EL1:
+ val &= ~ARM64_FEATURE_MASK(ID_MMFR4_EL1_CCIDX);
+ break;
+ }
+
+ return val;
+}
+
+/* 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);
+ if (vcpu_has_nv(vcpu))
+ access_nested_id_reg(vcpu, p, r);
+
+ return true;
+}
+
+/*
+ * 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 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 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;
+}
+
+static int set_id_aa64dfr0_el1(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd,
+ u64 val)
+{
+ u8 pmuver, host_pmuver;
+ bool valid_pmu;
+
+ host_pmuver = kvm_arm_pmu_get_pmuver_limit();
+
+ /*
+ * Allow AA64DFR0_EL1.PMUver to be set from userspace as long
+ * as it doesn't promise more than what the HW gives us. We
+ * allow an IMPDEF PMU though, only if no PMU is supported
+ * (KVM backward compatibility handling).
+ */
+ pmuver = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer), val);
+ if ((pmuver != ID_AA64DFR0_EL1_PMUVer_IMP_DEF && pmuver > host_pmuver))
+ return -EINVAL;
+
+ valid_pmu = (pmuver != 0 && pmuver != ID_AA64DFR0_EL1_PMUVer_IMP_DEF);
+
+ /* Make sure view register and PMU support do match */
+ if (kvm_vcpu_has_pmu(vcpu) != valid_pmu)
+ return -EINVAL;
+
+ /* We can only differ with PMUver, and anything else is an error */
+ val ^= read_id_reg(vcpu, rd);
+ val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer);
+ if (val)
+ return -EINVAL;
+
+ if (valid_pmu)
+ vcpu->kvm->arch.dfr0_pmuver.imp = pmuver;
+ else
+ vcpu->kvm->arch.dfr0_pmuver.unimp = pmuver;
+
+ return 0;
+}
+
+static int set_id_dfr0_el1(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd,
+ u64 val)
+{
+ u8 perfmon, host_perfmon;
+ bool valid_pmu;
+
+ host_perfmon = pmuver_to_perfmon(kvm_arm_pmu_get_pmuver_limit());
+
+ /*
+ * Allow DFR0_EL1.PerfMon to be set from userspace as long as
+ * it doesn't promise more than what the HW gives us on the
+ * AArch64 side (as everything is emulated with that), and
+ * that this is a PMUv3.
+ */
+ perfmon = FIELD_GET(ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon), val);
+ if ((perfmon != ID_DFR0_EL1_PerfMon_IMPDEF && perfmon > host_perfmon) ||
+ (perfmon != 0 && perfmon < ID_DFR0_EL1_PerfMon_PMUv3))
+ return -EINVAL;
+
+ valid_pmu = (perfmon != 0 && perfmon != ID_DFR0_EL1_PerfMon_IMPDEF);
+
+ /* Make sure view register and PMU support do match */
+ if (kvm_vcpu_has_pmu(vcpu) != valid_pmu)
+ return -EINVAL;
+
+ /* We can only differ with PerfMon, and anything else is an error */
+ val ^= read_id_reg(vcpu, rd);
+ val &= ~ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon);
+ if (val)
+ return -EINVAL;
+
+ if (valid_pmu)
+ vcpu->kvm->arch.dfr0_pmuver.imp = perfmon_to_pmuver(perfmon);
+ else
+ vcpu->kvm->arch.dfr0_pmuver.unimp = perfmon_to_pmuver(perfmon);
+
+ return 0;
+}
+
+/* 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, \
+}
+
+static const struct sys_reg_desc id_reg_descs[] = {
+ /*
+ * 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),
+ { SYS_DESC(SYS_ID_DFR0_EL1), .access = access_id_reg,
+ .get_user = get_id_reg, .set_user = set_id_dfr0_el1,
+ .visibility = aa32_id_visibility, },
+ 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 */
+ { SYS_DESC(SYS_ID_AA64DFR0_EL1), .access = access_id_reg,
+ .get_user = get_id_reg, .set_user = set_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),
+};
+
+/**
+ * emulate_id_reg - Emulate a guest access to an AArch64 CPU ID feature register
+ * @vcpu: The VCPU pointer
+ * @params: Decoded system register parameters
+ *
+ * Return: true if the ID register access was successful, false otherwise.
+ */
+int emulate_id_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *params)
+{
+ const struct sys_reg_desc *r;
+
+ r = find_reg(params, id_reg_descs, ARRAY_SIZE(id_reg_descs));
+
+ if (likely(r)) {
+ perform_access(vcpu, params, r);
+ } else {
+ print_sys_reg_msg(params,
+ "Unsupported guest id_reg access at: %lx [%08lx]\n",
+ *vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
+ kvm_inject_undefined(vcpu);
+ }
+
+ return 1;
+}
+
+
+void kvm_arm_reset_id_regs(struct kvm_vcpu *vcpu)
+{
+ unsigned long i;
+
+ for (i = 0; i < ARRAY_SIZE(id_reg_descs); i++)
+ if (id_reg_descs[i].reset)
+ id_reg_descs[i].reset(vcpu, &id_reg_descs[i]);
+}
+
+int kvm_arm_get_id_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ return kvm_sys_reg_get_user(vcpu, reg,
+ id_reg_descs, ARRAY_SIZE(id_reg_descs));
+}
+
+int kvm_arm_set_id_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ return kvm_sys_reg_set_user(vcpu, reg,
+ id_reg_descs, ARRAY_SIZE(id_reg_descs));
+}
+
+bool kvm_arm_check_idreg_table(void)
+{
+ return check_sysreg_table(id_reg_descs, ARRAY_SIZE(id_reg_descs), false);
+}
+
+int kvm_arm_walk_id_regs(struct kvm_vcpu *vcpu, u64 __user *uind)
+{
+ const struct sys_reg_desc *i2, *end2;
+ unsigned int total = 0;
+ int err;
+
+ i2 = id_reg_descs;
+ end2 = id_reg_descs + ARRAY_SIZE(id_reg_descs);
+
+ while (i2 != end2) {
+ err = walk_one_sys_reg(vcpu, i2++, &uind, &total);
+ if (err)
+ return err;
+ }
+ return total;
+}
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 53749d3a0996..22b60474fcab 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -53,16 +53,6 @@ static bool read_from_write_only(struct kvm_vcpu *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;
@@ -1153,163 +1143,6 @@ static bool access_arch_timer(struct kvm_vcpu *vcpu,
return true;
}
-static u8 vcpu_pmuver(const struct kvm_vcpu *vcpu)
-{
- if (kvm_vcpu_has_pmu(vcpu))
- return vcpu->kvm->arch.dfr0_pmuver.imp;
-
- return vcpu->kvm->arch.dfr0_pmuver.unimp;
-}
-
-static u8 perfmon_to_pmuver(u8 perfmon)
-{
- switch (perfmon) {
- case ID_DFR0_EL1_PerfMon_PMUv3:
- return ID_AA64DFR0_EL1_PMUVer_IMP;
- case ID_DFR0_EL1_PerfMon_IMPDEF:
- return ID_AA64DFR0_EL1_PMUVer_IMP_DEF;
- default:
- /* Anything ARMv8.1+ and NI have the same value. For now. */
- return perfmon;
- }
-}
-
-static u8 pmuver_to_perfmon(u8 pmuver)
-{
- switch (pmuver) {
- case ID_AA64DFR0_EL1_PMUVer_IMP:
- return ID_DFR0_EL1_PerfMon_PMUv3;
- case ID_AA64DFR0_EL1_PMUVer_IMP_DEF:
- return ID_DFR0_EL1_PerfMon_IMPDEF;
- default:
- /* Anything ARMv8.1+ and NI have the same value. For now. */
- return pmuver;
- }
-}
-
-/* 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);
- /* Set PMUver to the required version */
- val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer);
- val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer),
- vcpu_pmuver(vcpu));
- /* Hide SPE from guests */
- val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMSVer);
- break;
- case SYS_ID_DFR0_EL1:
- val &= ~ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon);
- val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon),
- pmuver_to_perfmon(vcpu_pmuver(vcpu)));
- break;
- case SYS_ID_AA64MMFR2_EL1:
- val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
- break;
- case SYS_ID_MMFR4_EL1:
- val &= ~ARM64_FEATURE_MASK(ID_MMFR4_EL1_CCIDX);
- 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);
- if (vcpu_has_nv(vcpu))
- access_nested_id_reg(vcpu, p, 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)
@@ -1320,144 +1153,6 @@ static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
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;
-}
-
-static int set_id_aa64dfr0_el1(struct kvm_vcpu *vcpu,
- const struct sys_reg_desc *rd,
- u64 val)
-{
- u8 pmuver, host_pmuver;
- bool valid_pmu;
-
- host_pmuver = kvm_arm_pmu_get_pmuver_limit();
-
- /*
- * Allow AA64DFR0_EL1.PMUver to be set from userspace as long
- * as it doesn't promise more than what the HW gives us. We
- * allow an IMPDEF PMU though, only if no PMU is supported
- * (KVM backward compatibility handling).
- */
- pmuver = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer), val);
- if ((pmuver != ID_AA64DFR0_EL1_PMUVer_IMP_DEF && pmuver > host_pmuver))
- return -EINVAL;
-
- valid_pmu = (pmuver != 0 && pmuver != ID_AA64DFR0_EL1_PMUVer_IMP_DEF);
-
- /* Make sure view register and PMU support do match */
- if (kvm_vcpu_has_pmu(vcpu) != valid_pmu)
- return -EINVAL;
-
- /* We can only differ with PMUver, and anything else is an error */
- val ^= read_id_reg(vcpu, rd);
- val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer);
- if (val)
- return -EINVAL;
-
- if (valid_pmu)
- vcpu->kvm->arch.dfr0_pmuver.imp = pmuver;
- else
- vcpu->kvm->arch.dfr0_pmuver.unimp = pmuver;
-
- return 0;
-}
-
-static int set_id_dfr0_el1(struct kvm_vcpu *vcpu,
- const struct sys_reg_desc *rd,
- u64 val)
-{
- u8 perfmon, host_perfmon;
- bool valid_pmu;
-
- host_perfmon = pmuver_to_perfmon(kvm_arm_pmu_get_pmuver_limit());
-
- /*
- * Allow DFR0_EL1.PerfMon to be set from userspace as long as
- * it doesn't promise more than what the HW gives us on the
- * AArch64 side (as everything is emulated with that), and
- * that this is a PMUv3.
- */
- perfmon = FIELD_GET(ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon), val);
- if ((perfmon != ID_DFR0_EL1_PerfMon_IMPDEF && perfmon > host_perfmon) ||
- (perfmon != 0 && perfmon < ID_DFR0_EL1_PerfMon_PMUv3))
- return -EINVAL;
-
- valid_pmu = (perfmon != 0 && perfmon != ID_DFR0_EL1_PerfMon_IMPDEF);
-
- /* Make sure view register and PMU support do match */
- if (kvm_vcpu_has_pmu(vcpu) != valid_pmu)
- return -EINVAL;
-
- /* We can only differ with PerfMon, and anything else is an error */
- val ^= read_id_reg(vcpu, rd);
- val &= ~ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon);
- if (val)
- return -EINVAL;
-
- if (valid_pmu)
- vcpu->kvm->arch.dfr0_pmuver.imp = perfmon_to_pmuver(perfmon);
- else
- vcpu->kvm->arch.dfr0_pmuver.unimp = perfmon_to_pmuver(perfmon);
-
- 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)
{
@@ -1642,50 +1337,6 @@ static unsigned int elx2_visibility(const struct kvm_vcpu *vcpu,
.visibility = elx2_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, \
-}
-
static bool access_sp_el1(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
@@ -1776,87 +1427,6 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ 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),
- { SYS_DESC(SYS_ID_DFR0_EL1), .access = access_id_reg,
- .get_user = get_id_reg, .set_user = set_id_dfr0_el1,
- .visibility = aa32_id_visibility, },
- 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 */
- { SYS_DESC(SYS_ID_AA64DFR0_EL1), .access = access_id_reg,
- .get_user = get_id_reg, .set_user = set_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 },
@@ -2531,8 +2101,8 @@ static const struct sys_reg_desc cp15_64_regs[] = {
{ 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)
+bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n,
+ bool is_32)
{
unsigned int i;
@@ -2557,7 +2127,7 @@ int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu)
return 1;
}
-static void perform_access(struct kvm_vcpu *vcpu,
+void perform_access(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r)
{
@@ -2912,6 +2482,8 @@ void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
{
unsigned long i;
+ kvm_arm_reset_id_regs(vcpu);
+
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]);
@@ -2932,6 +2504,9 @@ int kvm_handle_sys_reg(struct kvm_vcpu *vcpu)
params = esr_sys64_to_params(esr);
params.regval = vcpu_get_reg(vcpu, Rt);
+ if (is_id_reg(reg_to_encoding(¶ms)))
+ return emulate_id_reg(vcpu, ¶ms);
+
if (!emulate_sys_reg(vcpu, ¶ms))
return 1;
@@ -3160,6 +2735,10 @@ int kvm_arm_sys_reg_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg
if (err != -ENOENT)
return err;
+ err = kvm_arm_get_id_reg(vcpu, reg);
+ if (err != -ENOENT)
+ return err;
+
return kvm_sys_reg_get_user(vcpu, reg,
sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
}
@@ -3204,6 +2783,10 @@ int kvm_arm_sys_reg_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg
if (err != -ENOENT)
return err;
+ err = kvm_arm_set_id_reg(vcpu, reg);
+ if (err != -ENOENT)
+ return err;
+
return kvm_sys_reg_set_user(vcpu, reg,
sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
}
@@ -3250,10 +2833,10 @@ static bool copy_reg_to_user(const struct sys_reg_desc *reg, u64 __user **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)
+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,
@@ -3294,6 +2877,7 @@ unsigned long kvm_arm_num_sys_reg_descs(struct kvm_vcpu *vcpu)
{
return ARRAY_SIZE(invariant_sys_regs)
+ num_demux_regs()
+ + kvm_arm_walk_id_regs(vcpu, (u64 __user *)NULL)
+ walk_sys_regs(vcpu, (u64 __user *)NULL);
}
@@ -3309,6 +2893,11 @@ int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
uindices++;
}
+ err = kvm_arm_walk_id_regs(vcpu, uindices);
+ if (err < 0)
+ return err;
+ uindices += err;
+
err = walk_sys_regs(vcpu, uindices);
if (err < 0)
return err;
@@ -3323,6 +2912,7 @@ int __init kvm_sys_reg_table_init(void)
unsigned int i;
/* Make sure tables are unique and in order. */
+ valid &= kvm_arm_check_idreg_table();
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);
diff --git a/arch/arm64/kvm/sys_regs.h b/arch/arm64/kvm/sys_regs.h
index 6b11f2cc7146..ad41305348f7 100644
--- a/arch/arm64/kvm/sys_regs.h
+++ b/arch/arm64/kvm/sys_regs.h
@@ -210,6 +210,35 @@ find_reg(const struct sys_reg_params *params, const struct sys_reg_desc table[],
return __inline_bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg);
}
+static inline unsigned int raz_visibility(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *r)
+{
+ return REG_RAZ;
+}
+
+static inline 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;
+}
+
+/*
+ * Return true if the register's (Op0, Op1, CRn, CRm, Op2) is
+ * (3, 0, 0, crm, op2), where 1<=crm<8, 0<=op2<8.
+ */
+static inline bool is_id_reg(u32 id)
+{
+ return (sys_reg_Op0(id) == 3 && sys_reg_Op1(id) == 0 &&
+ sys_reg_CRn(id) == 0 && sys_reg_CRm(id) >= 1 &&
+ sys_reg_CRm(id) < 8);
+}
+
+void perform_access(struct kvm_vcpu *vcpu, struct sys_reg_params *params,
+ const struct sys_reg_desc *r);
const struct sys_reg_desc *get_reg_by_id(u64 id,
const struct sys_reg_desc table[],
unsigned int num);
@@ -220,6 +249,18 @@ int kvm_sys_reg_get_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
const struct sys_reg_desc table[], unsigned int num);
int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
const struct sys_reg_desc table[], unsigned int num);
+bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n,
+ bool is_32);
+int walk_one_sys_reg(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd,
+ u64 __user **uind,
+ unsigned int *total);
+int emulate_id_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *params);
+void kvm_arm_reset_id_regs(struct kvm_vcpu *vcpu);
+int kvm_arm_get_id_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
+int kvm_arm_set_id_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
+bool kvm_arm_check_idreg_table(void);
+int kvm_arm_walk_id_regs(struct kvm_vcpu *vcpu, u64 __user *uind);
#define AA32(_x) .aarch32_map = AA32_##_x
#define Op0(_x) .Op0 = _x
--
2.39.2.722.g9855ee24e9-goog
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