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KVM: VMX: Preserve segment limit and access rights in real mode

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While this is undocumented, real processors do not reload the segment
limit and access rights when loading a segment register in real mode.
Real programs rely on it so we need to comply with this behaviour.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2012-08-21 17:07:08 +03:00 committed by Marcelo Tosatti
parent 7263642028
commit 1390a28b27
1 changed files with 3 additions and 0 deletions
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arch/x86/kvm/vmx.c
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@ -3113,6 +3113,9 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu,
if (seg == VCPU_SREG_TR if (seg == VCPU_SREG_TR
|| var->selector == vmx_read_guest_seg_selector(vmx, seg)) || var->selector == vmx_read_guest_seg_selector(vmx, seg))
return; return;
var->base = vmx_read_guest_seg_base(vmx, seg);
var->selector = vmx_read_guest_seg_selector(vmx, seg);
return;
} }
var->base = vmx_read_guest_seg_base(vmx, seg); var->base = vmx_read_guest_seg_base(vmx, seg);
var->limit = vmx_read_guest_seg_limit(vmx, seg); var->limit = vmx_read_guest_seg_limit(vmx, seg);