From: Liu Jingqi Date: Tue, 6 Nov 2018 05:55:27 +0000 (+0800) Subject: KVM: x86: expose MOVDIRI CPU feature into VM. X-Git-Tag: v5.4-rc1~1380^2~50 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=74f2370bb64f5c1c418f115e338f20f11b75f954;p=platform%2Fkernel%2Flinux-rpi.git KVM: x86: expose MOVDIRI CPU feature into VM. 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/\ architecture-instruction-set-extensions-programming-reference.pdf Signed-off-by: Liu Jingqi Cc: Xu Tao Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index bbffa6c..8045434 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -404,7 +404,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, 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 =