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[PATCH] KVM: x86: mask CPUID(0xD,0x1).EAX against host value

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  [PATCH] KVM: x86: mask CPUID(0xD,0x1).EAX against host value Paolo Bonzini <pbonzini@redhat.com> - 2016-04-07 13:50 +0200
    Re: [PATCH] KVM: x86: mask CPUID(0xD,0x1).EAX against host value Radim Krčmář <rkrcmar@redhat.com> - 2016-04-07 16:50 +0200

#1373301 — [PATCH] 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
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/cpuid.c | 1 +
 1 file changed, 1 insertion(+)

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 =
-- 
1.8.3.1

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#1373446

2016-04-07 13:47+0200, Paolo Bonzini:
> This ensures that the guest doesn't see XSAVE extensions
> (e.g. xgetbv1 or xsavec) that the host lacks.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---

Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>

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