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SubjectRe: [PATCH v3 14/17] arm64: Add a capability for FEAT_ECV
On Sun, Oct 10, 2021 at 12:43:03PM +0100, Marc Zyngier wrote:
> Add a new capability to detect the Enhanced Counter Virtualization
> feature (FEAT_ECV).
>
> Reviewed-by: Oliver Upton <oupton@google.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
> arch/arm64/kernel/cpufeature.c | 10 ++++++++++
> arch/arm64/tools/cpucaps | 1 +
> 2 files changed, 11 insertions(+)
>
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index f8a3067d10c6..26b11ce8fff6 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -1926,6 +1926,16 @@ 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",
> diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
> index 49305c2e6dfd..7a7c58acd8f0 100644
> --- a/arch/arm64/tools/cpucaps
> +++ b/arch/arm64/tools/cpucaps
> @@ -18,6 +18,7 @@ HAS_CRC32
> HAS_DCPODP
> HAS_DCPOP
> HAS_E0PD
> +HAS_ECV
> HAS_EPAN
> HAS_GENERIC_AUTH
> HAS_GENERIC_AUTH_ARCH

We should also make the ECV field FTR_VISIBLE.

Will

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