| Message ID | 20210126124444.27136-2-zhukeqian1@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | kvm: arm64: Implement SW/HW combined dirty log | expand |
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 9a555809b89c..dfded86c7684 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -664,6 +664,18 @@ static inline bool system_supports_mixed_endian(void) return val == 0x1; } +static inline bool system_supports_hw_dbm(void) +{ + u64 mmfr1; + u32 val; + + mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); + val = cpuid_feature_extract_unsigned_field(mmfr1, + ID_AA64MMFR1_HADBS_SHIFT); + + return val == 0x2; +} + static __always_inline bool system_supports_fpsimd(void) { return !cpus_have_const_cap(ARM64_HAS_NO_FPSIMD);
Though we already has a cpu capability named ARM64_HW_DBM, it's a LOCAL_CPU cap and conditionally compiled by CONFIG_ARM64_HW_AFDBM. This reports the system wide support of HW_DBM. Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> --- arch/arm64/include/asm/cpufeature.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)