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

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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>
This commit is contained in:
Andre Przywara 2009-04-28 12:45:43 +02:00 committed by Avi Kivity
parent 9b5843ddd2
commit b586eb0253
1 changed files with 9 additions and 0 deletions
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9
arch/x86/kvm/svm.c
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@ -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;
}
}