From: Liu Jingqi jingqi.liu@intel.com
mainline inclusion from mainline-v5.1-rc1 commit 74f2370bb64f5c1c418f115e338f20f11b75f954 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4MKP4 CVE: NA
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MOVDIRI moves doubleword or quadword from register to memory through direct store which is implemented by using write combining (WC) for writing data directly into memory without caching the data.
Availability of the MOVDIRI instruction is indicated by the presence of the CPUID feature flag MOVDIRI(CPUID.0x07.0x0:ECX[bit 27]).
This patch exposes the movdiri 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 Signed-off-by: Laibin Qiu qiulaibin@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 89d26399eaad..77a86af73c0c 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(CLDEMOTE) | F(MOVDIRI);
/* cpuid 7.0.edx*/ const u32 kvm_cpuid_7_0_edx_x86_features =