arm64: cpufeature: add Permission Indirection Extension cpucap

This indicates if the system supports PIE. This is a CPUCAP_BOOT_CPU_FEATURE
as the boot CPU will enable PIE if it has it, so secondary CPUs must also
have this feature.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230606145859.697944-8-joey.gouly@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 12107c0..6607a9a 100644 (file)
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2680,6 +2680,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
                .matches = has_cpuid_feature,
                ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, TCRX, IMP)
        },
+       {
+               .desc = "Stage-1 Permission Indirection Extension (S1PIE)",
+               .capability = ARM64_HAS_S1PIE,
+               .type = ARM64_CPUCAP_BOOT_CPU_FEATURE,
+               .matches = has_cpuid_feature,
+               ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1PIE, IMP)
+       },
        {},
 };
 

diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index ebf5d44..19c23c4 100644 (file)
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -40,6 +40,7 @@ HAS_NESTED_VIRT
 HAS_NO_FPSIMD
 HAS_NO_HW_PREFETCH
 HAS_PAN
+HAS_S1PIE
 HAS_RAS_EXTN
 HAS_RNG
 HAS_SB