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From: Sheng Yang <sheng@linux.intel.com>
To: Avi Kivity <avi@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org, Sheng Yang <sheng@linux.intel.com>,
	stable@kernel.org
Subject: [PATCH] KVM: Fix OSXSAVE after migration
Date: Wed,  8 Dec 2010 10:49:43 +0800	[thread overview]
Message-ID: <1291776583-9979-1-git-send-email-sheng@linux.intel.com> (raw)

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

Cc: stable@kernel.org
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
 arch/x86/kvm/x86.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ed373ba..51a2bce 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5585,6 +5585,8 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 
 	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.walk_mmu, vcpu->arch.cr3);
 		mmu_reset_needed = 1;
-- 
1.7.0.1


             reply	other threads:[~2010-12-08  2:46 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-08  2:49 Sheng Yang [this message]
2010-12-08 10:33 ` [PATCH] KVM: Fix OSXSAVE after migration Avi Kivity
2010-12-09  1:17   ` Sheng Yang
2010-12-09 10:04     ` Avi Kivity

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