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arm64: Add feature detection for fine grained traps

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In order to allow us to have shared code for managing fine grained traps
for KVM guests add it as a detected feature rather than relying on it
being a dependency of other features.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
[maz: converted to ARM64_CPUID_FIELDS()]
Link: https://lore.kernel.org/r/20230301-kvm-arm64-fgt-v4-1-1bf8d235ac1f@kernel.org
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Miguel Luis <miguel.luis@oracle.com>
Reviewed-by: Jing Zhang <jingzhangos@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230815183903.2735724-10-maz@kernel.org
This commit is contained in:
Mark Brown 2023-08-15 19:38:43 +01:00 committed by Marc Zyngier
parent cc24f656f7
commit b206a708cb
2 changed files with 8 additions and 0 deletions
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7
arch/arm64/kernel/cpufeature.c
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@ -2627,6 +2627,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_cpuid_feature,
ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, LRCPC, IMP)
},
{
.desc = "Fine Grained Traps",
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.capability = ARM64_HAS_FGT,
.matches = has_cpuid_feature,
ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, IMP)
},
#ifdef CONFIG_ARM64_SME
{
.desc = "Scalable Matrix Extension",

1
arch/arm64/tools/cpucaps
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@ -26,6 +26,7 @@ HAS_ECV
HAS_ECV_CNTPOFF
HAS_EPAN
HAS_EVT
HAS_FGT
HAS_GENERIC_AUTH
HAS_GENERIC_AUTH_ARCH_QARMA3
HAS_GENERIC_AUTH_ARCH_QARMA5