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arm64: cpufeature: add Permission Overlay Extension cpucap

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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@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-6-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Joey Gouly 2024-08-22 16:10:48 +01:00 committed by Will Deacon
parent 878c05e8ef
commit 3496f69391
2 changed files with 10 additions and 0 deletions
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9
arch/arm64/kernel/cpufeature.c
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@ -2870,6 +2870,15 @@ 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
{},
};

1
arch/arm64/tools/cpucaps
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@ -45,6 +45,7 @@ HAS_MOPS
HAS_NESTED_VIRT
HAS_PAN
HAS_S1PIE
HAS_S1POE
HAS_RAS_EXTN
HAS_RNG
HAS_SB