There is another kernel to play with (2.6.37-0.1.rc1.git8.xendom0.fc15) at http://koji.fedoraproject.org/koji/taskinfo?taskID=2598434 . This has patches from xen/next-2.6.37 , which includes the gntdev module, so it should in theory be possible to use a userspace blkback. My testing with a no network or disk guest are as successful as I could expect them to be. Michael Young -- xen mailing list xen@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/xen