[PATCH 1/5] KVM: Make the GET_SREGS and SET_SREGS ioctls symmetric

[Avi Kivity <avi@qumranet.com>]

This makes the SET_SREGS ioctl behave symmetrically to the GET_SREGS
ioctl wrt the segment access rights flag.

From: Uri Lublin <uril@qumranet.com>

Signed-off-by: Uri Lublin <uril@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -884,6 +884,8 @@ static void vmx_set_segment(struct kvm_v
 		ar |= (var->db & 1) << 14;
 		ar |= (var->g & 1) << 15;
 	}
+	if (ar == 0) /* a 0 value means unusable */
+		ar = AR_UNUSABLE_MASK;
 	vmcs_write32(sf->ar_bytes, ar);
 }