Commit 33e943a2 authored by Yeoreum Yun's avatar Yeoreum Yun Committed by Catalin Marinas
Browse files

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: default avatarYeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250618092957.2069907-2-yeoreum.yun@arm.com


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent d09674f9

arch/arm64/kernel/cpufeature.c

+8 −0
Original line number Diff line number Diff line
@@ -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)",

arch/arm64/tools/cpucaps

+1 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ MPAM_HCR 
MTE

MTE_ASYMM

MTE_FAR

MTE_STORE_ONLY

SME

SME_FA64

SME2