* Daniel P. Berrangé (berra...@redhat.com) wrote: > On Wed, Feb 16, 2022 at 05:40:44PM +0000, Dr. David Alan Gilbert wrote: > > * Thomas Huth (th...@redhat.com) wrote: > > > On 16/02/2022 12.01, Dr. David Alan Gilbert wrote: > > > > * Gerd Hoffmann (kra...@redhat.com) wrote: > > > > > Hi, > > > > > > Given the semantic differences from 'i440fx', changing the default > > > > > > machine type has effects that are equivalent to breaking command > > > > > > line syntax compatibility, which is something we've always tried > > > > > > to avoid. > > > > > > > > > > And if we are fine breaking backward compatibility I'd rather *not* > > > > > pick > > > > > a default, effectively making -M $something mandatory, similar to arm. > > > > > > > > Oh, that's probably easy to do; what are other peoples thoughts on > > > > that? > > > > > > I agree with Gerd. Getting rid of a default machine on x86 is likely > > > better > > > than silently changing it to q35. But I'd maybe say that this should go > > > through the deprecation process first? > > > > So just adding something like the following under 'System emulator > > machines': > > > > x86 default machine type > > ------------------------ > > > > x86 currently defaults to the very old ```pc``` machine type > > which is based on the very old ```i440f``` chipset. This default > > will be removed and the user will be required to specify a machine > > type explicitly using -M; users are encouraged to switch to the > > not quite as old ```q35``` machine types. > > > > > > (This option is going to take a lot more work switching all the > > test cases over; in my world here I'd only changed the tests that broke > > on q35, now everything is going to need to specify a type). > > ....which is still nothing compared to how many users will be impacted > and the docs all over the internet we'll never be able to change, which > give illustrations using qemu command lines without '-M pc'
What's your prreference - it sounds like you'd prefer to leave the default as 'pc' ? aarch's message is: qemu-system-aarch64: No machine specified, and there is no default Use -machine help to list supported machines We could add a: 'Use -machine pc for the old default behaviour' Dave > Regards, > Daniel > -- > |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| > |: https://libvirt.org -o- https://fstop138.berrange.com :| > |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK