From: Liu Jingqi jingqi.liu@intel.com
mainline inclusion from mainline-v5.1-rc1 commit c029b5deb0b5d7e5090317b835f21c5d93999db7 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4MKP4 CVE: NA
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MOVDIR64B moves 64-bytes as direct-store with 64-bytes write atomicity. Direct store is implemented by using write combining (WC) for writing data directly into memory without caching the data.
Availability of the MOVDIR64B instruction is indicated by the presence of the CPUID feature flag MOVDIR64B (CPUID.0x07.0x0:ECX[bit 28]).
This patch exposes the movdir64b feature to the guest.
The release document ref below link: https://software.intel.com/sites/default/files/managed/c5/15/%5C architecture-instruction-set-extensions-programming-reference.pdf
Signed-off-by: Liu Jingqi jingqi.liu@intel.com Cc: Xu Tao tao3.xu@intel.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Jackie Liu liuyun01@kylinos.cn #openEuler_contributor Signed-off-by: Laibin Qiu qiulaibin@huawei.com Reviewed-by: Zenghui Yu yuzenghui@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- arch/x86/kvm/cpuid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 77a86af73c0cf..5249a60966dc7 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -353,7 +353,7 @@ static inline void do_cpuid_7_mask(struct kvm_cpuid_entry2 *entry, int index) F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ | F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) | F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG) | - F(CLDEMOTE) | F(MOVDIRI); + F(CLDEMOTE) | F(MOVDIRI) | F(MOVDIR64B);
/* cpuid 7.0.edx*/ const u32 kvm_cpuid_7_0_edx_x86_features =