Bug: https://launchpad.net/bugs/665531 The fixes for CVE-2010-2237, CVE-2010-2238 and CVE-2010-2239 broke format=host_device for the qemu driver. Qemu's host_device is used to specify raw files that don't have holes, so we need to treat <driver name='qemu' type='host_device'/> as raw in virDomainDiskDefForeachPath() (like we do for 'aio'). For example, the following xml is no longer valid, but should be: <disk type='file' device='disk'> <driver name='qemu' type='host_device'/> <source file='/tmp/foo.img'/> <target dev='hda' bus='ide'/> </disk> This is confirmed as not working on 0.8.3 and 0.8.5. The attached patch against 0.8.5 fixes the issue and restores host_device support. -- Jamie Strandboge | http://www.canonical.com