[PATCH v4 05/29] arm64: cpufeature: add Permission Overlay Extension cpucap

[Anshuman Khandual]

On 5/3/24 18:31, Joey Gouly wrote:
> This indicates if the system supports POE. This is a CPUCAP_BOOT_CPU_FEATURE
> as the boot CPU will enable POE if it has it, so secondary CPUs must also
> have this feature.
> 
> Signed-off-by: Joey Gouly <joey.gouly at arm.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> ---
>  arch/arm64/kernel/cpufeature.c | 9 +++++++++
>  arch/arm64/tools/cpucaps       | 1 +
>  2 files changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 56583677c1f2..2f3c2346e156 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -2861,6 +2861,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
>  		.matches = has_nv1,
>  		ARM64_CPUID_FIELDS_NEG(ID_AA64MMFR4_EL1, E2H0, NI_NV1)
>  	},
> +#ifdef CONFIG_ARM64_POE
> +	{
> +		.desc = "Stage-1 Permission Overlay Extension (S1POE)",
> +		.capability = ARM64_HAS_S1POE,
> +		.type = ARM64_CPUCAP_BOOT_CPU_FEATURE,
> +		.matches = has_cpuid_feature,
> +		ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1POE, IMP)
> +	},
> +#endif
>  	{},
>  };
>  
> diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
> index 62b2838a231a..45f558fc0d87 100644
> --- a/arch/arm64/tools/cpucaps
> +++ b/arch/arm64/tools/cpucaps
> @@ -45,6 +45,7 @@ HAS_MOPS
>  HAS_NESTED_VIRT
>  HAS_PAN
>  HAS_S1PIE
> +HAS_S1POE
>  HAS_RAS_EXTN
>  HAS_RNG
>  HAS_SB

Reviewed-by: Anshuman Khandual <anshuman.khandual at arm.com>