After trying a few more things and discussing with upstream, I'm afraid
the answer will be to mark this as unsupported in the release notes.
Because users could be using -m pc-1.0 in raring+, we cannot simply use
the old qemu-kvm values for pc-1.0 and lower machines, as that would fix
users from newer releases.
The one possibility which would remain, would be to publish an alternate
qemu package (perhaps in ppa) which uses the older values, and advise
users needing to migrate images from precise to install that package.
Key to this would be to make sure that users use a higher machine type
when starting new VMs so that they could be migrated to the new qemu
values for subsequent releases.
In order to make sure that this is not an issue after trusty, we will
define a trusty-specific machine type.
** Changed in: libvirt (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1291321
Title:
migration fails between 12.04 Precise and 14.04 Trusty
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