Re: [PATCH for-6.0] accel: Wire accel to /machine

[Peter Krempa]

On Mon, Dec 07, 2020 at 12:38:49 -0500, Eduardo Habkost wrote:
> On Mon, Dec 07, 2020 at 11:46:22AM +0300, Roman Bolshakov wrote:
> > There's no generic way to query current accel and its properties via QOM
> > because there's no link between an accel and current machine.
> > 
> > The change adds the link, i.e. if HVF is enabled the following will be
> > available in QOM:
> > 
> >   (qemu) qom-get /machine/accel type
> >   "hvf-accel"
> > 
> > Suggested-by: Markus Armbruster <armbru@redhat.com>
> > Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> > Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
> > ---
> > 
> > Hi,
> > 
> > this is a follow up patch that deprecates earlier series [1].
> > 
> 
> Is there a reference to the reasoning for dropping the earlier
> approach?  Your previous approach seems preferable.

The gist of the discussion before was that deprecating old commands in
the same release cycle as introducing the replacement might be
problematic if libvirt wants to adapt ASAP and that the new command
should be elevated to a intermediate tier of stability, where ACK from
libvirt is needed to change it during the same release cycle
incompatibly.

That was meant generally for any command, and was started because we had
a similar issue recently.

My intention definitely was not to change the patch itself, but more a
process change so that we can keep cooperating on new stuff rapidly, but
without actually breaking what we do.