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KVM: SVM: Fix cross vendor migration issue with unusable bit

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AMDs VMCB does not have an explicit unusable segment descriptor field,
so we emulate it by using "not present". This has to be setup before
the fixups, because this field is used there.

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 12:45:30 +02:00 committed by Avi Kivity
parent a4d7749be5
commit 19bca6ab75
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kvm/svm.c
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@ -796,6 +796,11 @@ static void svm_get_segment(struct kvm_vcpu *vcpu,
var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1;
/* AMD's VMCB does not have an explicit unusable field, so emulate it
* for cross vendor migration purposes by "not present"
*/
var->unusable = !var->present || (var->type == 0);
switch (seg) {
case VCPU_SREG_CS:
/*
@ -827,8 +832,6 @@ static void svm_get_segment(struct kvm_vcpu *vcpu,
var->type |= 0x1;
break;
}
var->unusable = !var->present;
}
static int svm_get_cpl(struct kvm_vcpu *vcpu)