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Mon, 6 Feb 2023 12:49:07 +0000 (UTC) Received: from redhat.com (unknown [10.33.36.62]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D4C62C15BA0; Mon, 6 Feb 2023 12:49:04 +0000 (UTC) Date: Mon, 6 Feb 2023 12:49:00 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Thomas Huth Cc: Pierre Morel , qemu-s390x@nongnu.org, qemu-devel@nongnu.org, borntraeger@de.ibm.com, pasic@linux.ibm.com, richard.henderson@linaro.org, david@redhat.com, cohuck@redhat.com, mst@redhat.com, pbonzini@redhat.com, kvm@vger.kernel.org, ehabkost@redhat.com, marcel.apfelbaum@gmail.com, eblake@redhat.com, armbru@redhat.com, seiden@linux.ibm.com, nrb@linux.ibm.com, nsg@linux.ibm.com, frankja@linux.ibm.com, clg@kaod.org Subject: Re: [PATCH v15 09/11] machine: adding s390 topology to query-cpu-fast Message-ID: References: <20230201132051.126868-1-pmorel@linux.ibm.com> <20230201132051.126868-10-pmorel@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.2.9 (2022-11-12) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Feb 06, 2023 at 01:41:44PM +0100, Thomas Huth wrote: > On 01/02/2023 14.20, Pierre Morel wrote: > > S390x provides two more topology containers above the sockets, > > books and drawers. > > > > Let's add these CPU attributes to the QAPI command query-cpu-fast. > > > > Signed-off-by: Pierre Morel > > --- > > qapi/machine.json | 13 ++++++++++--- > > hw/core/machine-qmp-cmds.c | 2 ++ > > 2 files changed, 12 insertions(+), 3 deletions(-) > > > > diff --git a/qapi/machine.json b/qapi/machine.json > > index 3036117059..e36c39e258 100644 > > --- a/qapi/machine.json > > +++ b/qapi/machine.json > > @@ -53,11 +53,18 @@ > > # > > # Additional information about a virtual S390 CPU > > # > > -# @cpu-state: the virtual CPU's state > > +# @cpu-state: the virtual CPU's state (since 2.12) > > +# @dedicated: the virtual CPU's dedication (since 8.0) > > +# @polarity: the virtual CPU's polarity (since 8.0) > > # > > # Since: 2.12 > > ## > > -{ 'struct': 'CpuInfoS390', 'data': { 'cpu-state': 'CpuS390State' } } > > +{ 'struct': 'CpuInfoS390', > > + 'data': { 'cpu-state': 'CpuS390State', > > + 'dedicated': 'bool', > > + 'polarity': 'int' > > I think it would also be better to mark the new fields as optional and only > return them if the guest has the topology enabled, to avoid confusing > clients that were written before this change. FWIW, I would say that the general expectation of QMP clients is that they must *always* expect new fields to appear in dicts that are returned in QMP replies. We add new fields at will on a frequent basis. So personally I'd keep life simple and unconditionally report the new fields. With 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 :|