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FAILED: patch "[PATCH] KVM: x86: mask CPUID(0xD,0x1).EAX against host value" failed to apply to 4.5-stable tree

PATCH [email protected] 1 participant 1 message Apr 27, 2016

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The patch below does not apply to the 4.5-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

Quoted 1 line

From 316314cae15fb0e3869b76b468f59a0c83ac3d4e Mon Sep 17 00:00:00 2001

From: Paolo Bonzini <[email protected]>
Date: Mon, 21 Mar 2016 12:33:00 +0100
Subject: [PATCH] KVM: x86: mask CPUID(0xD,0x1).EAX against host value
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This ensures that the guest doesn't see XSAVE extensions (e.g. xgetbv1 or xsavec) that the host lacks.

arch/x86/kvm/cpuid.c +1 -0
index 8efb839948e5..bbbaa802d13e 100644
@@ -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 =