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arm64/cpufeature: Add MTE_STORE_ONLY feature 

Since ARMv8.9, FEAT_MTE_STORE_ONLY can be used to restrict raise of tag
check fault on store operation only.

add MTE_STORE_ONLY feature.

Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250618092957.2069907-2-yeoreum.yun@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Yeoreum Yun 2025-06-18 10:29:50 +01:00 committed by Catalin Marinas
parent d09674f98c
commit 33e943a228
2 changed files with 9 additions and 0 deletions
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8
arch/arm64/kernel/cpufeature.c
View File

@ -321,6 +321,7 @@ static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = {
static const struct arm64_ftr_bits ftr_id_aa64pfr2[] = {
ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_FPMR_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_MTEFAR_SHIFT, 4, ID_AA64PFR2_EL1_MTEFAR_NI),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_MTESTOREONLY_SHIFT, 4, ID_AA64PFR2_EL1_MTESTOREONLY_NI),
ARM64_FTR_END,
};
@ -2882,6 +2883,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_cpuid_feature,
ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, MTEFAR, IMP)
},
{
.desc = "Store Only MTE Tag Check",
.capability = ARM64_MTE_STORE_ONLY,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.matches = has_cpuid_feature,
ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, MTESTOREONLY, IMP)
},
#endif /* CONFIG_ARM64_MTE */
{
.desc = "RCpc load-acquire (LDAPR)",

1
arch/arm64/tools/cpucaps
View File

@ -69,6 +69,7 @@ MPAM_HCR
MTE
MTE_ASYMM
MTE_FAR
MTE_STORE_ONLY
SME
SME_FA64
SME2