KVM: x86: Enable AVX for guest
PATCH 1/1 KVM: x86: Enable AVX for guest
Enable Intel(R) Advanced Vector Extension(AVX) for guest.
The detection of AVX feature includes OSXSAVE bit testing. When OSXSAVE bit is not set, even if AVX is supported, the AVX instruction would result in UD as well. So we're safe to expose AVX bits to guest directly.
Signed-off-by Sheng Yang <[email protected]>
--- arch/x86/kvm/x86.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
arch/x86/kvm/x86.c +2 -2
@@ -1963,13 +1963,13 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);/* cpuid 1.ecx */ const u32 kvm_supported_word4_x86_features = -F (XMM3 ) |0 /* Reserved, DTES64, MONITOR */ | +F (XMM3 ) |F (PCLMULQDQ ) |0 /* DTES64, MONITOR */ |0 /* DS-CPL, VMX, SMX, EST */ |0 /* TM2 */ |F (SSSE3 ) |0 /* CNXT-ID */ |0 /* Reserved */ |0 /* Reserved */ |F (CX16 ) |0 /* xTPR Update, PDCM */ |0 /* Reserved, DCA */ |F (XMM4_1 ) |F (XMM4_2 ) |F (X2APIC ) |F (MOVBE ) |F (POPCNT ) | -0 /* Reserved, AES */ |F (XSAVE ) |0 /* OSXSAVE */ ; +0 /* Reserved, AES */ |F (XSAVE ) |0 /* OSXSAVE */ |F (AVX );/* cpuid 0x80000001.ecx */ const u32 kvm_supported_word6_x86_features = F(LAHF_LM) | F(CMP_LEGACY) | F(SVM) | 0 /* ExtApicSpace */ |
Signature · 1 line
1.7.0.1
Avi Kivity
AppliedQuoted 6 lines · Sheng Yang
Enable Intel(R) Advanced Vector Extension(AVX) for guest.
The detection of AVX feature includes OSXSAVE bit testing. When OSXSAVE bit is not set, even if AVX is supported, the AVX instruction would result in UD as well. So we're safe to expose AVX bits to guest directly.
Applied, thanks.
Signature · 1 line
error compiling committee.c: too many arguments to function