KVM: SVM: Set the 'busy' flag of the TR selector

(cherry picked from c0d09828c870f90c6bc72070ada281568f89c63b)

The busy flag of the TR selector is not set by the hardware. This breaks
migration from amd hosts to intel hosts.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 14ba6ff63cfc1a6ccd47e64c9153fb901aad64d5..cf5c7aaea2f92853d45de6bf964fb5ee340ffef0 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -781,6 +781,13 @@ static void svm_get_segment(struct kvm_vcpu *vcpu,
        if (seg == VCPU_SREG_CS)
                var->g = s->limit > 0xfffff;
 
+       /*
+        * Work around a bug where the busy flag in the tr selector
+        * isn't exposed
+        */
+       if (seg == VCPU_SREG_TR)
+               var->type |= 0x2;
+
        var->unusable = !var->present;
 }