This is a note to let you know that I've just added the patch titled
KVM: x86: remove vcpu's CPL check in host-invoked XCR set
to the 3.0-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-remove-vcpu-s-cpl-check-in-host-invoked-xcr-set.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 764bcbc5a6d7a2f3e75c9f0e4caa984e2926e346 Mon Sep 17 00:00:00 2001
From: "Zhanghaoyu (A)" <haoyu.zhang@xxxxxxxxxx>
Date: Fri, 14 Jun 2013 07:36:13 +0000
Subject: KVM: x86: remove vcpu's CPL check in host-invoked XCR set
From: "Zhanghaoyu (A)" <haoyu.zhang@xxxxxxxxxx>
commit 764bcbc5a6d7a2f3e75c9f0e4caa984e2926e346 upstream.
__kvm_set_xcr function does the CPL check when set xcr. __kvm_set_xcr is
called in two flows, one is invoked by guest, call stack shown as below,
handle_xsetbv(or xsetbv_interception)
kvm_set_xcr
__kvm_set_xcr
the other one is invoked by host, for example during system reset:
kvm_arch_vcpu_ioctl
kvm_vcpu_ioctl_x86_set_xcrs
__kvm_set_xcr
The former does need the CPL check, but the latter does not.
Signed-off-by: Zhang Haoyu <haoyu.zhang@xxxxxxxxxx>
[Tweaks to commit message. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -548,8 +548,6 @@ int __kvm_set_xcr(struct kvm_vcpu *vcpu,
if (index != XCR_XFEATURE_ENABLED_MASK)
return 1;
xcr0 = xcr;
- if (kvm_x86_ops->get_cpl(vcpu) != 0)
- return 1;
if (!(xcr0 & XSTATE_FP))
return 1;
if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
@@ -563,7 +561,8 @@ int __kvm_set_xcr(struct kvm_vcpu *vcpu,
int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
{
- if (__kvm_set_xcr(vcpu, index, xcr)) {
+ if (kvm_x86_ops->get_cpl(vcpu) != 0 ||
+ __kvm_set_xcr(vcpu, index, xcr)) {
kvm_inject_gp(vcpu, 0);
return 1;
}
Patches currently in stable-queue which might be from haoyu.zhang@xxxxxxxxxx are
queue-3.0/kvm-x86-remove-vcpu-s-cpl-check-in-host-invoked-xcr-set.patch
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