Commit b206a708 authored by Mark Brown's avatar Mark Brown Committed by Marc Zyngier
Browse files

arm64: Add feature detection for fine grained traps 



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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
Signed-off-by: default avatarMark 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: default avatarZenghui Yu <yuzenghui@huawei.com>
Reviewed-by: default avatarMiguel Luis <miguel.luis@oracle.com>
Reviewed-by: default avatarJing Zhang <jingzhangos@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230815183903.2735724-10-maz@kernel.org
parent cc24f656

arch/arm64/kernel/cpufeature.c

+7 −0
Original line number Diff line number Diff line
@@ -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",

arch/arm64/tools/cpucaps

+1 −0
Original line number Diff line number Diff line
@@ -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