Index: xen-4.4.0-testing/tools/python/xen/xend/XendConfig.py
===================================================================
--- xen-4.4.0-testing.orig/tools/python/xen/xend/XendConfig.py
+++ xen-4.4.0-testing/tools/python/xen/xend/XendConfig.py
@@ -1865,7 +1865,14 @@ class XendConfig(dict):
         ports = sxp.child(dev_sxp, 'port')
         for port in ports[1:]:
             try:
-                num, bus = port
+                # When ['port' ['1','']] is saved into sxp file, it will become (port (1 ))
+                # If using this sxp file, here variable "port" will be port=1,
+                # we should process it, otherwise, it will report error.
+                if len(port) == 1:
+                    num = port[0]
+                    bus = ""
+                else:
+                    num, bus = port
                 dev_config['port-%i' % int(num)] = str(bus)
             except TypeError:
                 pass