diff -r a672af698bc3 tools/python/xen/util/blkif.py
--- a/tools/python/xen/util/blkif.py	Fri Jul 09 12:35:58 2010 +0100
+++ b/tools/python/xen/util/blkif.py	Sun Jul 11 12:13:34 2010 +0400
@@ -87,7 +87,10 @@
                 fn = "/dev/%s" %(fn,)
                
         if typ in ("tap", "tap2"):
-            (taptype, fn) = fn.split(":", 1)
+            if fn.count(":") == 1:
+                (taptype, fn) = fn.split(":", 1)
+            else:
+                (taptype, fn) = fn.split(":", 2)[1:3]
     return (fn, taptype)
 
 def blkdev_uname_to_file(uname):