Commit 5ea8e519 authored by Vincenzo Frascino's avatar Vincenzo Frascino
Browse files

arm64: mte: CPU feature detection for Asymm MTE



Add the cpufeature entries to detect the presence of Asymmetric MTE.

Note: The tag checking mode is initialized via cpu_enable_mte() ->
kasan_init_hw_tags() hence to enable it we require asymmetric mode
to be at least on the boot CPU. If the boot CPU does not have it, it is
fine for late CPUs to have it as long as the feature is not enabled
(ARM64_CPUCAP_BOOT_CPU_FEATURE).

Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Signed-off-by: Vincenzo Frascino's avatarVincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Catalin Marinas's avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Suzuki Poulose's avatarSuzuki K Poulose <suzuki.poulose@arm.com>
parent c4d1a101
......@@ -2321,6 +2321,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.sign = FTR_UNSIGNED,
.cpu_enable = cpu_enable_mte,
},
{
.desc = "Asymmetric MTE Tag Check Fault",
.capability = ARM64_MTE_ASYMM,
.type = ARM64_CPUCAP_BOOT_CPU_FEATURE,
.matches = has_cpuid_feature,
.sys_reg = SYS_ID_AA64PFR1_EL1,
.field_pos = ID_AA64PFR1_MTE_SHIFT,
.min_field_value = ID_AA64PFR1_MTE_ASYMM,
.sign = FTR_UNSIGNED,
},
#endif /* CONFIG_ARM64_MTE */
{
.desc = "RCpc load-acquire (LDAPR)",
......
......@@ -39,6 +39,7 @@ HW_DBM
KVM_PROTECTED_MODE
MISMATCHED_CACHE_TYPE
MTE
MTE_ASYMM
SPECTRE_V2
SPECTRE_V3A
SPECTRE_V4
......
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