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arm64: Detect FEAT_SCTLR2 

KVM is about to pick up support for SCTLR2. Add cpucap for later use in
the guest/host context switch hot path.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250708172532.1699409-2-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2025-07-08 10:25:06 -07:00
parent 86731a2a65
commit bf49e73dde
2 changed files with 9 additions and 0 deletions
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8
arch/arm64/kernel/cpufeature.c
View File

@ -500,6 +500,7 @@ static const struct arm64_ftr_bits ftr_id_aa64mmfr3[] = {
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_POE),
FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1POE_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_S1PIE_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_SCTLRX_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR3_EL1_TCRX_SHIFT, 4, 0),
ARM64_FTR_END,
};
@ -3061,6 +3062,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_pmuv3,
},
#endif
{
.desc = "SCTLR2",
.capability = ARM64_HAS_SCTLR2,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.matches = has_cpuid_feature,
ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, SCTLRX, IMP)
},
{},
};

1
arch/arm64/tools/cpucaps
View File

@ -49,6 +49,7 @@ HAS_PAN
HAS_PMUV3
HAS_S1PIE
HAS_S1POE
HAS_SCTLR2
HAS_RAS_EXTN
HAS_RNG
HAS_SB