On 03/18/2015 07:03 AM, Deepak Shetty wrote: [please don't top-post on technical lists]
> Hmm interesting, so without adding backing_fmt, if i enable the below in > /etc/libvirt/qemu.conf, will it work ? > > # If allow_disk_format_probing is enabled, libvirt will probe disk > # images to attempt to identify their format, when not otherwise > # specified in the XML. This is disabled by default. > # > # WARNING: Enabling probing is a security hole in almost all > # deployments. It is strongly recommended that users update their > # guest XML <disk> elements to include <driver type='XXXX'/> > # elements instead of enabling this option. > # > #allow_disk_format_probing = 1 It _might_ work in that libvirt will then probe the backing chain as qcow2, rather than treating it as raw; on the other hand, the upcoming qemu 2.3 is trying to deprecate probing altogether because of the security problems it represented, and so you may reach a point where even if you tell libvirt it is okay to probe, that qemu will refuse to open your image if you didn't specify backing format. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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