diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2014-11-21 20:13:26 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-11-23 20:33:37 +0300 |
| commit | b65d6e17fe2239c9b2051727903955d922083fbf (patch) | |
| tree | f6073d37ef7a6ab3eb3603cd4fed2a3e2d58cf4d /arch/x86/kvm/cpuid.c | |
| parent | c274e03af70544506cd7214fcc2d4c4376c2c6f4 (diff) | |
| download | linux-b65d6e17fe2239c9b2051727903955d922083fbf.tar.xz | |
kvm: x86: mask out XSAVES
This feature is not supported inside KVM guests yet, because we do not emulate
MSR_IA32_XSS. Mask it out.
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 20d83217fb1d..a4f5ac46226c 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -320,6 +320,10 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, F(ADX) | F(SMAP) | F(AVX512F) | F(AVX512PF) | F(AVX512ER) | F(AVX512CD); + /* cpuid 0xD.1.eax */ + const u32 kvm_supported_word10_x86_features = + F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1); + /* all calls to cpuid_count() should be made on the same cpu */ get_cpu(); @@ -456,13 +460,18 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, entry->eax &= supported; entry->edx &= supported >> 32; entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; + if (!supported) + break; + for (idx = 1, i = 1; idx < 64; ++idx) { u64 mask = ((u64)1 << idx); if (*nent >= maxnent) goto out; do_cpuid_1_ent(&entry[i], function, idx); - if (entry[i].eax == 0 || !(supported & mask)) + if (idx == 1) + entry[i].eax &= kvm_supported_word10_x86_features; + else if (entry[i].eax == 0 || !(supported & mask)) continue; entry[i].flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |