Gerd Hoffmann <kra...@redhat.com> writes:

> On So, 2016-02-07 at 12:29 +0200, Michael S. Tsirkin wrote:
>> We don't ship bios without support for loading ACPI anymore, and old q35
>> machine types don't allow migrating such bios.  Drop it, as well as
>> has_*mr flags that are there for migration compatibility.
>
> Wouldn't that break migration between 2.5 and 2.6 with -M q35-1.6 ?
> It's also a guest-visible change as acpi tables change ...

Madness.

> I'm all for cleaning up this old cruft, but I think it would be cleaner
> to just drop the old (pre-migration support) q35 machine types instead
> of changing them in subtle ways ...

Yup.

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