linux-kernel - [138/152] KVM: Fix OSXSAVE after migration

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Message-Id: <20110106002309.689444976@clark.site>
Date:	Wed, 05 Jan 2011 16:23:57 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sheng Yang <sheng@...ux.intel.com>, Avi Kivity <avi@...hat.com>
Subject: [138/152] KVM: Fix OSXSAVE after migration

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Sheng Yang <sheng@...ux.intel.com>

commit 3ea3aa8cf67d3bbe00a19b6a4013d19efa7d0f41 upstream.

CPUID's OSXSAVE is a mirror of CR4.OSXSAVE bit. We need to update the CPUID
after migration.

KVM-Stable-Tag.
Signed-off-by: Sheng Yang <sheng@...ux.intel.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/kvm/x86.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5112,6 +5112,8 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct
 
 	mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
 	kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
+	if (sregs->cr4 & X86_CR4_OSXSAVE)
+		update_cpuid(vcpu);
 	if (!is_long_mode(vcpu) && is_pae(vcpu)) {
 		load_pdptrs(vcpu, vcpu->arch.cr3);
 		mmu_reset_needed = 1;


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