diff mbox

[15/45] KVM: SVM: Fix cross vendor migration issue in segment segment descriptor

Message ID 1243180230-2480-16-git-send-email-avi@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Avi Kivity May 24, 2009, 3:50 p.m. UTC 
From: Andre Przywara <andre.przywara@amd.com>

On AMD CPUs sometimes the DB bit in the stack segment
descriptor is left as 1, although the whole segment has
been made unusable. Clear it here to pass an Intel VMX
entry check when cross vendor migrating.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
 arch/x86/kvm/svm.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 6350378..e3ea982 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -803,6 +803,15 @@  static void svm_get_segment(struct kvm_vcpu *vcpu,
 		if (!var->unusable)
 			var->type |= 0x1;
 		break;
+	case VCPU_SREG_SS:
+		/* On AMD CPUs sometimes the DB bit in the segment
+		 * descriptor is left as 1, although the whole segment has
+		 * been made unusable. Clear it here to pass an Intel VMX
+		 * entry check when cross vendor migrating.
+		 */
+		if (var->unusable)
+			var->db = 0;
+		break;
 	}
 }