$NetBSD: patch-tools_hotplug_NetBSD_vif-ip,v 1.2 2020/06/18 13:48:28 plunky Exp $

--- tools/hotplug/NetBSD/vif-ip.orig	2019-11-29 09:15:18.000000000 +0000
+++ tools/hotplug/NetBSD/vif-ip
@@ -23,7 +23,10 @@ case $xstatus in
 	xip=$(xenstore-read "$xpath/ip")
 	xfid=$(xenstore-read "$xpath/frontend-id")
 	xhandle=$(xenstore-read "$xpath/handle")
-	iface=$(xenstore-read "$xpath/vifname")
+	iface=$(xenstore-read "$xpath/vifname") || true
+	if [ x${iface} = "x" ] ; then
+		iface=xvif$xfid.$xhandle
+	fi
 	ifconfig $iface $xip up
 	xenstore-write $xpath/hotplug-status connected
 	exit 0