This is a note to let you know that I've just added the patch titled
KVM: x86: mask CPUID(0xD,0x1).EAX against host value
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-mask-cpuid-0xd-0x1-.eax-against-host-value.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 316314cae15fb0e3869b76b468f59a0c83ac3d4e Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Mon, 21 Mar 2016 12:33:00 +0100
Subject: KVM: x86: mask CPUID(0xD,0x1).EAX against host value
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From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
commit 316314cae15fb0e3869b76b468f59a0c83ac3d4e upstream.
This ensures that the guest doesn't see XSAVE extensions
(e.g. xgetbv1 or xsavec) that the host lacks.
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
[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@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -509,6 +509,7 @@ static inline int __do_cpuid_ent(struct
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 =
Patches currently in stable-queue which might be from pbonzini@xxxxxxxxxx are
queue-4.4/kvm-mtrr-remove-msr-0x2f8.patch
queue-4.4/kvm-x86-mask-cpuid-0xd-0x1-.eax-against-host-value.patch
queue-4.4/mips-kvm-fix-timer-irq-race-when-writing-cp0_compare.patch
queue-4.4/mips-kvm-fix-timer-irq-race-when-freezing-timer.patch
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