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>

parent fc5b7f3b

arch/x86/kvm/cpuid.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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 =