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arm64: Add a capability for FEAT_ECV

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Add a new capability to detect the Enhanced Counter Virtualization
feature (FEAT_ECV).

Reviewed-by: Oliver Upton <oupton@google.com>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211017124225.3018098-15-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2021-10-17 13:42:22 +01:00 committed by Will Deacon
parent 0e277fb807
commit fdf865988b
2 changed files with 11 additions and 0 deletions
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10
arch/arm64/kernel/cpufeature.c
View File

@ -1930,6 +1930,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.sign = FTR_UNSIGNED,
.min_field_value = 1,
},
{
.desc = "Enhanced Counter Virtualization",
.capability = ARM64_HAS_ECV,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.matches = has_cpuid_feature,
.sys_reg = SYS_ID_AA64MMFR0_EL1,
.field_pos = ID_AA64MMFR0_ECV_SHIFT,
.sign = FTR_UNSIGNED,
.min_field_value = 1,
},
#ifdef CONFIG_ARM64_PAN
{
.desc = "Privileged Access Never",

1
arch/arm64/tools/cpucaps
View File

@ -18,6 +18,7 @@ HAS_CRC32
HAS_DCPODP
HAS_DCPOP
HAS_E0PD
HAS_ECV
HAS_EPAN
HAS_GENERIC_AUTH
HAS_GENERIC_AUTH_ARCH