[PATCH v2 14/16] arm64: Add a capability for FEAT_ECV
From: Marc Zyngier <maz@kernel.org>
Date: 2021-09-22 21:26:55
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Add a new capability to detect the Enhanced Counter Virtualization feature (FEAT_ECV). Reviewed-by: Oliver Upton <redacted> Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/kernel/cpufeature.c | 10 ++++++++++ arch/arm64/tools/cpucaps | 1 + 2 files changed, 11 insertions(+)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index f8a3067d10c6..26b11ce8fff6 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c@@ -1926,6 +1926,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .sign = FTR_UNSIGNED, .min_field_value = 1, }, + { + .desc = "Enhanced Counter Virtualization", + .capability = ARM64_HAS_ECV, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_cpuid_feature, + .sys_reg = SYS_ID_AA64MMFR0_EL1, + .field_pos = ID_AA64MMFR0_ECV_SHIFT, + .sign = FTR_UNSIGNED, + .min_field_value = 1, + }, #ifdef CONFIG_ARM64_PAN { .desc = "Privileged Access Never",
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 49305c2e6dfd..7a7c58acd8f0 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps@@ -18,6 +18,7 @@ HAS_CRC32 HAS_DCPODP HAS_DCPOP HAS_E0PD +HAS_ECV HAS_EPAN HAS_GENERIC_AUTH HAS_GENERIC_AUTH_ARCH
--
2.30.2
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