[patch 60/88] KVM: SVM: Set the busy flag of the TR selector

Greg KH
2009-04-30T17:34:45Z

[-- Attachment #1: kvm-svm-set-the-busy-flag-of-the-tr-selector.patch --]
[-- Type: text/plain, Size: 889 bytes --]

2.6.28-stable review patch. If anyone has any objections, please let us know.

------------------

From: Amit Shah <amit.shah@redhat.com>

(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>
---
arch/x86/kvm/svm.c | 7 +++++++
1 file changed, 7 insertions(+)

--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -781,6 +781,13 @@ static void svm_get_segment(struct kvm_v
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;
}