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Wed, 3 Jun 2020 12:24:16 +0000 (UTC) Date: Wed, 3 Jun 2020 13:24:13 +0100 From: "Dr. David Alan Gilbert" To: David Hildenbrand Subject: Re: [PULL 04/12] hmp: Simplify qom-set Message-ID: <20200603122413.GE2974@work-vm> References: <20200601184004.272784-1-dgilbert@redhat.com> <20200601184004.272784-5-dgilbert@redhat.com> <87pnai7ymz.fsf@dusky.pond.sub.org> <20200602092601.GD2758@work-vm> <847cb8b5-1507-46cf-495a-952d41a3c2b2@redhat.com> <20200603104306.GC2974@work-vm> <457c1ac7-3281-5e98-481b-34d44e5174de@redhat.com> <20200603114317.GD2974@work-vm> <728b8cf4-7574-776c-c7fe-3ed5e20b33d2@redhat.com> MIME-Version: 1.0 In-Reply-To: <728b8cf4-7574-776c-c7fe-3ed5e20b33d2@redhat.com> User-Agent: Mutt/1.13.4 (2020-02-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Disposition: inline Received-SPF: pass client-ip=207.211.31.81; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/03 01:12:11 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, T_HK_NAME_DR=0.01 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mszeredi@redhat.com, lukasstraub2@web.de, quintela@redhat.com, qemu-devel@nongnu.org, pannengyuan@huawei.com, f4bug@amsat.org, Markus Armbruster , stefanha@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * David Hildenbrand (david@redhat.com) wrote: > On 03.06.20 13:43, Dr. David Alan Gilbert wrote: > > * David Hildenbrand (david@redhat.com) wrote: > >> On 03.06.20 12:43, Dr. David Alan Gilbert wrote: > >>> * David Hildenbrand (david@redhat.com) wrote: > >>>> On 02.06.20 11:26, Dr. David Alan Gilbert wrote: > >>>>> * Markus Armbruster (armbru@redhat.com) wrote: > >>>>>> "Dr. David Alan Gilbert (git)" writes: > >>>>>> > >>>>>>> From: "Dr. David Alan Gilbert" > >>>>>>> > >>>>>>> Simplify qom_set by making it use qmp_qom_set and the JSON parser. > >>>>>>> > >>>>>>> (qemu) qom-get /machine smm > >>>>>>> "auto" > >>>>>>> (qemu) qom-set /machine smm "auto" > >>>>>>> > >>>>>>> Signed-off-by: Dr. David Alan Gilbert > >>>>>>> Message-Id: <20200520151108.160598-3-dgilbert@redhat.com> > >>>>>>> Reviewed-by: Philippe Mathieu-Daudé > >>>>>>> Reviewed-by: Markus Armbruster > >>>>>>> Signed-off-by: Dr. David Alan Gilbert > >>>>>>> With 's'->'S' type change suggested by Paolo and Markus > >>>>>> > >>>>>> This is actually more than just simplification, it's disarming a bear > >>>>>> trap: the string visitor is restricted to a subset of the QAPI types, > >>>>>> and when you qom-set a property with a type it can't handle, QEMU > >>>>>> aborts. I mentioned this in the discussion of possible ways out of the > >>>>>> qom-get impasse, but missed reraising it in patch review. > >>>>>> > >>>>>> A suitably amended commit would be nice, but respinning the PR just for > >>>>>> that may not be worthwhile. > >>>>> > >>>>> A bit late; still as long as we're removing bear traps not adding them. > >>>> > >>>> This breaks qom-set for my (virtio-mem) use case: > >>>> > >>>> echo "qom-set vm0 requested-size 300M" | sudo nc -U /var/tmp/mon_src > >>>> QEMU 5.0.50 monitor - type 'help' for more information > >>>> (qemu) qom-set vm0 requested-size 300M > >>>> Error: Expecting at most one JSON value > >>> > >>> Does qom-set vm0 requested-size 300e6 do the same thing? > >> > >> The property is defined to be of type "size". > >> > >> (qemu) qom-set vm0 requested-size 300e6 > >> Error: Parameter 'requested-size' expects uint64 > >> > >> (not sure how "size" and "uint64" are mapped here) > > > > I think the problem here is that the JSON parser is converting anything > > with an 'e' as a float; JSON itself doesn't have the distinction > > between int and float. > > > > (and just to clarify - I assume you are aware - 300e6 != 300M. So the > interface becomes way harder to use in case one wants to specify > properly aligned sizes - 300M vs 314572800) Oops, yes, good point. I think on balance it's probably best that this keeps supporting JSON; although tbh I'm not convinced there are any complex types that can be set. I'm not seeing a prettier answer. Dave > > -- > Thanks, > > David / dhildenb -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK