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Commit 1390a28b authored by Avi Kivity's avatar Avi Kivity Committed by Marcelo Tosatti
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KVM: VMX: Preserve segment limit and access rights in real mode 



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: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 72636420

arch/x86/kvm/vmx.c

+3 −0
Original line number Diff line number Diff line
@@ -3113,6 +3113,9 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu, 
		if (seg == VCPU_SREG_TR

		    || var->selector == vmx_read_guest_seg_selector(vmx, seg))

			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->limit = vmx_read_guest_seg_limit(vmx, seg);