Re: [Qemu-devel] [PATCH 0/3] Export machine type deprecation info through QMP

[Daniel P . Berrangé]

On Wed, Apr 24, 2019 at 03:10:49PM -0300, Eduardo Habkost wrote:
> On Wed, Apr 24, 2019 at 09:56:53AM +0200, Thomas Huth wrote:
> > On 23/04/2019 23.22, Eduardo Habkost wrote:
> > > This series adds machine type deprecation information to the
> > > output of the `query-machines` QMP command.  With this, libvirt
> > > and management software will be able to show this information to
> > > users and/or suggest changes to VM configuration to avoid
> > > deprecated machine types.
> > > 
> > > Eduardo Habkost (3):
> > >   qapi: SupportStatusInfo struct
> > >   machine: Use SupportStatusInfo for deprecation info
> > >   qmp: Add deprecation information to query-machines
> > > 
> > >  qapi/common.json                   | 24 ++++++++++++++++++++++++
> > >  qapi/misc.json                     |  5 ++++-
> > >  include/hw/boards.h                |  7 ++++---
> > >  hw/i386/pc_piix.c                  |  4 +++-
> > >  hw/ppc/prep.c                      |  4 +++-
> > >  vl.c                               | 19 +++++++++++++++----
> > >  tests/acceptance/query_machines.py | 27 +++++++++++++++++++++++++++
> > >  7 files changed, 80 insertions(+), 10 deletions(-)
> > >  create mode 100644 tests/acceptance/query_machines.py
> > 
> > Good idea, but some questions come to my mind:
> > 
> > - What about devices? IIRC Gerd wrote a patch series last year that does
> >   something similar for devices... It would be good to synchronize the
> >   work, so that we do not have two completely interfaces between devices
> >   and machines here in the end...
> 
> My plan is to support this on devices, too.  I even had a version
> where documentation of SupportStatusInfo mentioned device types,
> but I decided to leave that out until we actually implement a
> device deprecation info API.

We need it on CPU models, and on CPU features too potentially. Essentially
we should consider it applicable to anything we report in QMP.


Regards,
Daniel
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