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

[Joey Gouly]

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.go...@arm.com>
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Will Deacon <w...@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
-- 
2.25.1