Re: [PATCH] hw/char/pl011: Fix clock migration failure

[Peter Maydell]

On Wed, 17 Mar 2021 at 12:55, Andrew Jones <drjones@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