[PATCH v5 1/2] arm64: Add feature detection for fine grained traps
Mark Brown
broonie at kernel.org
Wed Jul 12 05:50:11 PDT 2023
In order to allow us to have shared code for managing fine grained traps
for KVM guests add it as a detected feature rather than relying on it
being a dependency of other features.
Acked-by: Catalin Marinas <catalin.marinas at arm.com>
Signed-off-by: Mark Brown <broonie at kernel.org>
---
arch/arm64/kernel/cpufeature.c | 11 +++++++++++
arch/arm64/tools/cpucaps | 1 +
2 files changed, 12 insertions(+)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index f9d456fe132d..0768f98c49cc 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2627,6 +2627,17 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.matches = has_cpuid_feature,
ARM64_CPUID_FIELDS(ID_AA64ISAR1_EL1, LRCPC, IMP)
},
+ {
+ .desc = "Fine Grained Traps",
+ .type = ARM64_CPUCAP_SYSTEM_FEATURE,
+ .capability = ARM64_HAS_FGT,
+ .sys_reg = SYS_ID_AA64MMFR0_EL1,
+ .sign = FTR_UNSIGNED,
+ .field_pos = ID_AA64MMFR0_EL1_FGT_SHIFT,
+ .field_width = 4,
+ .min_field_value = 1,
+ .matches = has_cpuid_feature,
+ },
#ifdef CONFIG_ARM64_SME
{
.desc = "Scalable Matrix Extension",
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index c80ed4f3cbce..c3f06fdef609 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -26,6 +26,7 @@ HAS_ECV
HAS_ECV_CNTPOFF
HAS_EPAN
HAS_EVT
+HAS_FGT
HAS_GENERIC_AUTH
HAS_GENERIC_AUTH_ARCH_QARMA3
HAS_GENERIC_AUTH_ARCH_QARMA5
--
2.30.2
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