[PATCH 02/10] arm64: cpufeature: detect FEAT_HCX
From: Kristina Martsenko <hidden>
Date: 2023-02-16 16:01:45
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Detect if the system has the new HCRX_EL2 register added in ARMv8.7/9.2, so that subsequent patches can check for its presence. Signed-off-by: Kristina Martsenko <redacted> --- arch/arm64/kernel/cpufeature.c | 12 ++++++++++++ arch/arm64/tools/cpucaps | 1 + 2 files changed, 13 insertions(+)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 45a42cf2191c..1b0a71541381 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c@@ -357,6 +357,7 @@ static const struct arm64_ftr_bits ftr_id_aa64mmfr0[] = { static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_TIDCP1_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_AFP_SHIFT, 4, 0), + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_HCX_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_ETS_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_TWED_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR1_EL1_XNX_SHIFT, 4, 0),
@@ -2290,6 +2291,17 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .type = ARM64_CPUCAP_SYSTEM_FEATURE, .matches = is_kvm_protected_mode, }, + { + .desc = "HCRX_EL2 register", + .capability = ARM64_HAS_HCX, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .sys_reg = SYS_ID_AA64MMFR1_EL1, + .sign = FTR_UNSIGNED, + .field_pos = ID_AA64MMFR1_EL1_HCX_SHIFT, + .field_width = 4, + .min_field_value = ID_AA64MMFR1_EL1_HCX_IMP, + .matches = has_cpuid_feature, + }, #endif { .desc = "Kernel page table isolation (KPTI)",
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 10dcfa13390a..bf32a1122c04 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps@@ -31,6 +31,7 @@ HAS_GENERIC_AUTH_IMP_DEF HAS_GIC_CPUIF_SYSREGS HAS_GIC_PRIO_MASKING HAS_GIC_PRIO_RELAXED_SYNC +HAS_HCX HAS_LDAPR HAS_LSE_ATOMICS HAS_NO_FPSIMD
--
2.25.1
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