Index: xen-4.3.0-testing/tools/hotplug/Linux/init.d/xencommons
===================================================================
--- xen-4.3.0-testing.orig/tools/hotplug/Linux/init.d/xencommons
+++ xen-4.3.0-testing/tools/hotplug/Linux/init.d/xencommons
@@ -57,21 +57,27 @@ do_start () {
         local time=0
 	local timeout=30
 
-	modprobe xen-evtchn 2>/dev/null
-	modprobe xen-gntdev 2>/dev/null
-	modprobe xen-gntalloc 2>/dev/null
-	modprobe xen-blkback 2>/dev/null
-	modprobe xen-netback 2>/dev/null
-	modprobe xen-pciback 2>/dev/null
-	modprobe evtchn 2>/dev/null
-	modprobe gntdev 2>/dev/null
-	modprobe netbk 2>/dev/null
-	modprobe blkbk 2>/dev/null
-	modprobe xen-scsibk 2>/dev/null
-	modprobe usbbk 2>/dev/null
-	modprobe pciback 2>/dev/null
-	modprobe xen-acpi-processor 2>/dev/null
-	modprobe blktap2 2>/dev/null || modprobe blktap 2>/dev/null
+	#modprobe xen-evtchn 2>/dev/null
+	#modprobe xen-gntdev 2>/dev/null
+	#modprobe xen-gntalloc 2>/dev/null
+	#modprobe xen-blkback 2>/dev/null
+	#modprobe xen-netback 2>/dev/null
+	#modprobe xen-pciback 2>/dev/null
+	modprobe evtchn 2>/dev/null || true
+	modprobe gntdev 2>/dev/null || true
+	modprobe gntalloc 2>/dev/null || true
+	modprobe netbk 2>/dev/null || true
+	modprobe blkbk 2>/dev/null || true
+	modprobe xen-scsibk 2>/dev/null || true
+	modprobe usbbk 2>/dev/null || true
+	modprobe pciback 2>/dev/null || true
+	modprobe xen-acpi-processor 2>/dev/null || true
+	modprobe blktap2 2>/dev/null || true
+	modprobe blktap 2>/dev/null || true
+	# xenblk (frontend module) is needed in dom0, allowing it to use vbds
+	modprobe xenblk 2>/dev/null || true
+	# support xl create pv guest with qcow/qcow2 disk image
+	modprobe nbd max_part=8 2>/dev/null || true
 	mkdir -p /var/run/xen
 
 	if ! `${BINDIR}/xenstore-read -s / >/dev/null 2>&1`