Commit b586eb02 authored Apr 28, 2009 by Andre Przywara Committed by Avi Kivity Jun 10, 2009

KVM: SVM: Fix cross vendor migration issue in segment segment descriptor



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>

parent 9b5843dd

arch/x86/kvm/svm.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}
		}

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