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authorPaolo Bonzini <pbonzini@redhat.com>2016-03-21 12:33:00 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-06-01 12:15:52 -0700
commit039f0813ad4ed196883d87a6643041ae413dfde0 (patch)
tree3f4a89dbd2c7ba6f41693af435b585913ed6d9b3 /arch/x86
parenta6fa60f5614352eb53fc57b23f1984fed4e71eac (diff)
KVM: x86: mask CPUID(0xD,0x1).EAX against host value
commit 316314cae15fb0e3869b76b468f59a0c83ac3d4e upstream. 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> [4.5 does have CPUID_D_1_EAX, but earlier kernels don't, so use the numeric value. This is consistent with other occurrences of cpuid_mask in arch/x86/kvm/cpuid.c - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/cpuid.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 6525e926f566..2e1fd586b895 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -509,6 +509,7 @@ 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_supported_word10_x86_features;
+ cpuid_mask(&entry[i].eax, 10);
entry[i].ebx = 0;
if (entry[i].eax & (F(XSAVES)|F(XSAVEC)))
entry[i].ebx =