From: Zengruan Ye yezengruan@huawei.com
virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8WMG6 CVE: NA
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TWE Delay is an optional feature in ARMv8.6 Extensions. This patch detect this feature.
Signed-off-by: Zengruan Ye yezengruan@huawei.com Signed-off-by: Jingyi Wang wangjingyi11@huawei.com Signed-off-by: lishusen lishusen2@huawei.com --- arch/arm64/Kconfig | 10 ++++++++++ arch/arm64/configs/openeuler_defconfig | 6 ++++++ arch/arm64/kernel/cpufeature.c | 9 +++++++++ arch/arm64/tools/cpucaps | 1 + 4 files changed, 26 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 85ac1e83f747..4f128796aa45 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2197,6 +2197,16 @@ config ARM64_EPAN if the cpu does not implement the feature. endmenu # "ARMv8.7 architectural features"
+menu "ARMv8.6 architectural features" + +config ARM64_TWED + bool "Enable support for delayed trapping of WFE" + default y + help + Delayed Trapping of WFE (part of the ARMv8.6 Extensions) + +endmenu + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y diff --git a/arch/arm64/configs/openeuler_defconfig b/arch/arm64/configs/openeuler_defconfig index eb65de2f5a09..eec1886d07e9 100644 --- a/arch/arm64/configs/openeuler_defconfig +++ b/arch/arm64/configs/openeuler_defconfig @@ -533,6 +533,12 @@ CONFIG_ARM64_AS_HAS_MTE=y # CONFIG_ARM64_MTE is not set # end of ARMv8.5 architectural features
+# +# ARMv8.6 architectural features +# +CONFIG_ARM64_TWED=y +# end of ARMv8.6 architectural features + # # ARMv8.7 architectural features # diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 9410e4a032dd..a51aa8e6a92c 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2791,6 +2791,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .cpu_enable = cpu_enable_mpam, ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, MPAM, 1) }, +#endif +#ifdef CONFIG_ARM64_TWED + { + .desc = "Delayed Trapping of WFE", + .capability = ARM64_HAS_TWED, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_cpuid_feature, + ARM64_CPUID_FIELDS(ID_AA64MMFR1_EL1, TWED, IMP) + }, #endif {}, }; diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index c60a603d2cfe..889b8b6433cb 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -52,6 +52,7 @@ HAS_TIDCP1 HAS_TLB_RANGE HAS_VIRT_HOST_EXTN HAS_WFXT +HAS_TWED HW_DBM KVM_HVHE KVM_PROTECTED_MODE