From: Zengruan Ye yezengruan@huawei.com
virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8TN8N 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 Reviewed-by: Keqian Zhu zhukeqian1@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com
Signed-off-by: lishusen lishusen2@huawei.com --- arch/arm64/Kconfig | 10 ++++++++++ arch/arm64/kernel/cpufeature.c | 12 ++++++++++++ arch/arm64/tools/cpucaps | 1 + 3 files changed, 23 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index d1705fdc046a..9db5bd439a29 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2175,6 +2175,16 @@ 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/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 455e72ce080a..9169d622805d 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2722,6 +2722,18 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .matches = has_cpuid_feature, ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, EVT, IMP) }, +#ifdef CONFIG_ARM64_TWED + { + .desc = "Delayed Trapping of WFE", + .capability = ARM64_HAS_TWED, + .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .matches = has_cpuid_feature, + .sys_reg = SYS_ID_AA64MMFR1_EL1, + .field_pos = ID_AA64MMFR1_EL1_TWED_SHIFT, + .sign = FTR_UNSIGNED, + .min_field_value = 1, + }, +#endif {}, };
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index 569ecec76c16..fea9f598f4ef 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