linux-kernel - [190/200] KVM: x86: Check LMA bit before set

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Message-Id: <20100701174302.568114781@clark.site>
Date:	Thu, 01 Jul 2010 10:44:40 -0700
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>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: [190/200] KVM: x86: Check LMA bit before set_efer

2.6.34-stable review patch.  If anyone has any objections, please let me know.

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

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

kvm_x86_ops->set_efer() would execute vcpu->arch.efer = efer, so the
checking of LMA bit didn't work.

Signed-off-by: Sheng Yang <sheng@...ux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

(Cherry-picked from commit a3d204e28579427609c3d15d2310127ebaa47d94)
---
 arch/x86/kvm/x86.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -657,11 +657,11 @@ static void set_efer(struct kvm_vcpu *vc
 		}
 	}
 
-	kvm_x86_ops->set_efer(vcpu, efer);
-
 	efer &= ~EFER_LMA;
 	efer |= vcpu->arch.efer & EFER_LMA;
 
+	kvm_x86_ops->set_efer(vcpu, efer);
+
 	vcpu->arch.efer = efer;
 
 	vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;


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