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Commit 19bca6ab authored by Andre Przywara's avatar Andre Przywara Committed by Avi Kivity
Browse files

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



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: default avatarAndre Przywara <andre.przywara@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent a4d7749b

arch/x86/kvm/svm.c

+5 −2
Original line number Diff line number Diff line
@@ -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)