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 <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 68be38e233f5da4ab595d3202917f1f96e360f10..d39d6b25d3e5e6db3f7f5d38fc835e149d851dc6 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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 */ |