On Thu, Mar 07, 2019 at 12:52:46PM +0100, Erik Skultety wrote: > > However, looking at the bigger picture is this a safe thing to do? I mean, > > imagine the following scenario: > > > > 1) say there is capability X that affects certain part of cmd line. And > > assume that those two possibilities are incompatible. If cmd line is > > generated one way then migration to a qemu which has cmd line generated the > > other way fails. > > > > 2) in release R we deprecate X and thus do not format it in <capabilities/> > > in status XML. > > > > 3) user starts a domain D. > > > > 4) user saves D into a file > > > > 5) sysadmin downgrades libvirt to R-1 > > Do we even support downgrade this way? I know we migrate to older version but > isn't that different? Yeah, downgrades of libvirt are not something we claim is supported. If will often work but we're not guaranteeing it & have broken it in the past, especially for running guests. You might be lucky if you have upgraded & immedaitely downgrade, but if you've made changes to guests while the new libvirt was running all bets are off. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list
