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KVM: SVM: Set the 'g' bit of the cs selector for cross-vendor migration

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The hardware does not set the 'g' bit of the cs selector and this breaks
migration from amd hosts to intel hosts. Set this bit if the segment
limit is beyond 1 MB.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Amit Shah 2008-10-27 09:04:17 +00:00 committed by Avi Kivity
parent b8222ad2e5
commit 25022acc3d
1 changed files with 9 additions and 0 deletions
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9
arch/x86/kvm/svm.c
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@ -772,6 +772,15 @@ static void svm_get_segment(struct kvm_vcpu *vcpu,
var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1;
/*
* SVM always stores 0 for the 'G' bit in the CS selector in
* the VMCB on a VMEXIT. This hurts cross-vendor migration:
* Intel's VMENTRY has a check on the 'G' bit.
*/
if (seg == VCPU_SREG_CS)
var->g = s->limit > 0xfffff;
var->unusable = !var->present;
}