Re: [Qemu-devel] change x86 default machine type to Q35?

[Eduardo Habkost <ehabkost@redhat.com>]

On Tue, Jul 11, 2017 at 10:13:05AM +0200, Gerd Hoffmann wrote:
>   Hi,
> 
> > Concerning QEMU, could we maybe simply emit a warning a la
> > 
> >  "you did not specify a machine type with the -M option, so you are
> >   currently running the the 'pc' machine type. Please note that
> > future
> >   versions of QEMU might use the 'q35' machine type instead. If you
> >   require the 'pc' machine type for your setting, then please specify
> >   it with the -M option."
> 
> Warnings tend to get ignored until things are actually break, so I
> don't think this helps much.  I think simply not having a default
> machine type (as already suggested elsewhere in this thread) is the
> best way to deal with this.  That way we don't silently change
> behavior.  It also is in line with what we have on arm where we already
> require the user to explicitly pick a machine type.

If we do that, we probably should wait for libvirt to adapt and
choose its own default.  Current libvirt would pick an arbitrary
machine-type (the first one in the query-machines list) as the
default.

-- 
Eduardo