Suggested release note text:
Previous libvirt versions would probe a qemu disk to determine its format and
did not require that the format be declared in the XML. This is considered a
security problem in most deployments and newer versions of libvirt will default
to the 'raw' format when the format is not specified in the XML. As a result,
non-raw disks without unspecified disk format will no longer be available in
virtual machines.
The libvirt-migrate-qemu-disks tool is provided to aid in transitioning
virtual machine definitions to the new required format. In essence, it
will check all domains for affected virtual machines, probe the affected
disks and update the domain definition accordingly. This command will be
run automatically on upgrade. See 'man 1 libvirt-migrate-qemu-disks' for
details.
Users who require the old behavior can adjust the
'allow_disk_format_probing' option in /etc/libvirt/qemu.conf.
** Also affects: ubuntu-release-notes
Importance: Undecided
Status: New
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libvirt no longer probes chained backing stores
https://bugs.launchpad.net/bugs/656173
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