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authorAndre Przywara <andre.przywara@amd.com>2009-04-28 12:45:43 +0200
committerAvi Kivity <avi@redhat.com>2009-06-10 11:48:51 +0300
commitb586eb0253083795e58dcbe76665410d4676dc08 (patch)
tree7582e2f8df4828ff7de15ed68f379d75ed0bd08d /arch/x86/kvm
parent9b5843ddd20557b77c73ddbcc814a8c816bf3d3a (diff)
downloadop-kernel-dev-b586eb0253083795e58dcbe76665410d4676dc08.zip
op-kernel-dev-b586eb0253083795e58dcbe76665410d4676dc08.tar.gz
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>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/svm.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 6350378..e3ea982 100644
--- 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;
}
}
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