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| author | Marc Zyngier <maz@kernel.org> | 2023-03-30 18:47:43 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2023-03-30 19:01:09 +0100 |
| commit | 326349943ed181890b8b2af2755bd0eac93bd66d (patch) | |
| tree | 3125a25716b00c5b569d23df8aabc8b36928510d | |
| parent | eaacaa4f26ade43dfdfdd3707c95d734b5ffc530 (diff) | |
| download | lwn-326349943ed181890b8b2af2755bd0eac93bd66d.tar.gz lwn-326349943ed181890b8b2af2755bd0eac93bd66d.zip | |
arm64: Add HAS_ECV_CNTPOFF capability
Add the probing code for the FEAT_ECV variant that implements CNTPOFF_EL2.
Why it is optional is a mystery, but let's try and detect it.
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Reviewed-by: Colton Lewis <coltonlewis@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230330174800.2677007-4-maz@kernel.org
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 11 | ||||
| -rw-r--r-- | arch/arm64/tools/cpucaps | 1 |
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 2e3e55139777..c331c49a7d19 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2223,6 +2223,17 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .sign = FTR_UNSIGNED, .min_field_value = 1, }, + { + .desc = "Enhanced Counter Virtualization (CNTPOFF)", + .capability = ARM64_HAS_ECV_CNTPOFF, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_cpuid_feature, + .sys_reg = SYS_ID_AA64MMFR0_EL1, + .field_pos = ID_AA64MMFR0_EL1_ECV_SHIFT, + .field_width = 4, + .sign = FTR_UNSIGNED, + .min_field_value = ID_AA64MMFR0_EL1_ECV_CNTPOFF, + }, #ifdef CONFIG_ARM64_PAN { .desc = "Privileged Access Never", diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index 37b1340e9646..40ba95472594 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -23,6 +23,7 @@ HAS_DCPOP HAS_DIT HAS_E0PD HAS_ECV +HAS_ECV_CNTPOFF HAS_EPAN HAS_GENERIC_AUTH HAS_GENERIC_AUTH_ARCH_QARMA3 |