From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: rkrcmar@redhat.com, stable@vger.kernel.org
Subject: [PATCH] KVM: x86: mask CPUID(0xD,0x1).EAX against host value
Date: Thu, 7 Apr 2016 13:47:56 +0200 [thread overview]
Message-ID: <1460029676-41817-1-git-send-email-pbonzini@redhat.com> (raw)
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
next reply other threads:[~2016-04-07 11:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-07 11:47 Paolo Bonzini [this message]
2016-04-07 14:40 ` [PATCH] KVM: x86: mask CPUID(0xD,0x1).EAX against host value Radim Krčmář
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