diff mbox series

[v4,07/20] arm64: cpufeature: add Permission Indirection Extension cpucap

Message ID 20230606145859.697944-8-joey.gouly@arm.com (mailing list archive)
State New, archived
Headers show
Series Permission Indirection Extension | expand

Commit Message

Joey Gouly June 6, 2023, 2:58 p.m. UTC 
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: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
---
 arch/arm64/kernel/cpufeature.c | 7 +++++++
 arch/arm64/tools/cpucaps       | 1 +
 2 files changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 12107c07fb77..6607a9ae8418 100644
--- 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 ebf5d4407b64..19c23c4fa2da 100644
--- 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