Index: xen-3.3.1-testing/tools/examples/xen-backend.rules
===================================================================
--- xen-3.3.1-testing.orig/tools/examples/xen-backend.rules
+++ xen-3.3.1-testing/tools/examples/xen-backend.rules
@@ -7,3 +7,4 @@ SUBSYSTEM=="xen-backend", KERNEL=="vscsi
 SUBSYSTEM=="xen-backend", ACTION=="remove", RUN+="/etc/xen/scripts/xen-hotplug-cleanup"
 KERNEL=="evtchn", NAME="xen/%k"
 KERNEL=="blktap[0-9]*", NAME="xen/%k"
+KERNELS=="xen", KERNEL=="xvd*", SUBSYSTEM=="block", OPTIONS+="last_rule"