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>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 63503782935d6bae9cf6d51481186deee86500bf..e3ea98290f9bc88949ad69db01250eff66f2a0be 100644 (file)
--- 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;
        }
 }