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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2016-03-21 12:33:00 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-04-10 21:53:50 +0200 |
| commit | 316314cae15fb0e3869b76b468f59a0c83ac3d4e (patch) | |
| tree | 7ee2d450b5d8972971d17542410890d8559e7a05 /arch | |
| parent | kvm: x86: do not leak guest xcr0 into host interrupt handlers (diff) | |
| download | linux-dev-316314cae15fb0e3869b76b468f59a0c83ac3d4e.tar.xz linux-dev-316314cae15fb0e3869b76b468f59a0c83ac3d4e.zip | |
KVM: x86: mask CPUID(0xD,0x1).EAX against host value
This ensures that the guest doesn't see XSAVE extensions
(e.g. xgetbv1 or xsavec) that the host lacks.
Cc: stable@vger.kernel.org
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 8efb839948e5..bbbaa802d13e 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -534,6 +534,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, do_cpuid_1_ent(&entry[i], function, idx); if (idx == 1) { entry[i].eax &= kvm_cpuid_D_1_eax_x86_features; + cpuid_mask(&entry[i].eax, CPUID_D_1_EAX); entry[i].ebx = 0; if (entry[i].eax & (F(XSAVES)|F(XSAVEC))) entry[i].ebx = |