On Wed, 17 Mar 2021 at 12:55, Andrew Jones <drjo...@redhat.com> wrote: > I'm also curious what the state of mach-virt's machine types are for > migration.
Probably not great -- I don't think anybody is really testing cross-version migration, and I don't think there's a great deal of in-practice use of it for Arm either. (See also the issue with accidentally having env->features in the CPU migration data, which broke cross-version migration: that was around a while and we only got one user complaint about it.) Unless we have a serious test suite for this kind of thing upstream it's just going to continue to be broken, because at the moment all we have is "people make best-efforts to think about migration compat when coding and reviewing, but don't actually test". thanks -- PMM
