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KVM: arm64: Expose the WFXT feature to guests

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Plumb in the capability, and expose WFxT to guests when available.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419182755.601427-8-maz@kernel.org
This commit is contained in:
Marc Zyngier
2022-04-19 19:27:52 +01:00
parent a3fb596514
commit 06e0b80258
2 changed files with 13 additions and 0 deletions
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11
arch/arm64/kernel/cpufeature.c
View File

@@ -2443,6 +2443,17 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_cpuid_feature,
.min_field_value = 1,
},
{
.desc = "WFx with timeout",
.capability = ARM64_HAS_WFXT,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.sys_reg = SYS_ID_AA64ISAR2_EL1,
.sign = FTR_UNSIGNED,
.field_pos = ID_AA64ISAR2_WFXT_SHIFT,
.field_width = 4,
.matches = has_cpuid_feature,
.min_field_value = ID_AA64ISAR2_WFXT_SUPPORTED,
},
{},
};

2
arch/arm64/kvm/sys_regs.c
View File

@@ -1144,6 +1144,8 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
if (!vcpu_has_ptrauth(vcpu))
val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR2_APA3) |
ARM64_FEATURE_MASK(ID_AA64ISAR2_GPA3));
if (!cpus_have_final_cap(ARM64_HAS_WFXT))
val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_WFXT);
break;
case SYS_ID_AA64DFR0_EL1:
/* Limit debug to ARMv8.0 */