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| author | Oliver Upton <oliver.upton@linux.dev> | 2025-07-08 10:25:06 -0700 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2025-07-08 10:40:30 -0700 |
| commit | bf49e73dde7dd54bb52e67e0a1b72e748a04d0b4 (patch) | |
| tree | adbf60df73c6c72337631ee90280f1d3bb98c59a /arch/arm64/kernel | |
| parent | Linux 6.16-rc3 (diff) | |
| download | linux-bf49e73dde7dd54bb52e67e0a1b72e748a04d0b4.tar.gz linux-bf49e73dde7dd54bb52e67e0a1b72e748a04d0b4.zip | |
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>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index b34044e20128..b85be598cb17 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -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) + }, {}, }; |