Re: ARM Snapshots Not Backwards-Compatible

[Peter Maydell]

On Wed, 3 Feb 2021 at 10:28, Dr. David Alan Gilbert <dgilbert@redhat.com> wrote:
>
> * Philippe Mathieu-Daudé (philmd@redhat.com) wrote:
> > Cc'ing migration team and qemu-arm@ list.
>
> I'll have to leave the detail of that to the ARM peole; but from a
> migration point of view I think we do want the 64 bit ARM migrations to
> be stable now.  Please tie incompatible changes to machine types.

That is the intention, but because there's no upstream testing
of migration compat, we never notice if we get it wrong.
What is x86 doing to keep cross-version migration working ?

thanks
-- PMM