diff -r c02cc832cb2d tools/python/xen/xend/server/BlktapController.py
--- a/tools/python/xen/xend/server/BlktapController.py	Tue Apr 13 18:19:33 2010 +0100
+++ b/tools/python/xen/xend/server/BlktapController.py	Fri Apr 16 12:05:39 2010 -0600
@@ -189,7 +189,7 @@
             blktap2_installed=1;
 
         if typ in ('tap'):
-            if subtyp in ('tapdisk'):
+            if subtyp in ('tapdisk', 'ioemu'):
                 if params not in blktap2_disk_types or not blktap2_installed:
                     # pass this device off to BlktapController
                     log.warn('WARNING: using deprecated blktap module')