Anthony Liguori wrote: > On 05/24/2010 03:35 PM, Jan Kiszka wrote: >> In contrast to save/loadvm, device_show does not provide a >> backward-compatible output. Not only field names can change (as a result >> of internal refactoring), > > Field names could change, but that seems unlikely and unnecessary.
Actually, this may happen to improve the output format for device_show, either via renaming the fields or annotating it (once we have the latter mechanism). > >> fields may even disappear, > > That would break live migration. Nope. We can (and I think we did before) perfectly read some field up to version X and convert it into the new format but skip that field for X+1 upward. > The output of device_show when > specifying -M pc-0.13 should always be the same. If it's not, I believe > that's a bug. > > The output of device_show across multiple qemu versions without > specifying a -M could certainly be different but that's to be expected > since you have a different hardware model. It will be different as soon as the version_id of a dumped vmstate changes, even independent of -M. Jan
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