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Wed, 24 Jun 2020 10:22:14 +0200 (CEST) From: Markus Armbruster To: Eric Auger Subject: Re: [PATCH] qom: Allow object_property_add_child() to fail References: <20200623155452.30954-1-eric.auger@redhat.com> Date: Wed, 24 Jun 2020 10:22:14 +0200 In-Reply-To: <20200623155452.30954-1-eric.auger@redhat.com> (Eric Auger's message of "Tue, 23 Jun 2020 17:54:52 +0200") Message-ID: <87eeq4dgax.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=207.211.31.81; envelope-from=armbru@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/24 01:59:40 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: pbonzini@redhat.com, berrange@redhat.com, qemu-devel@nongnu.org, ehabkost@redhat.com, eric.auger.pro@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Eric Auger writes: > object_property_add() does not allow object_property_try_add() > to gracefully fail as &error_abort is passed as an error handle. > > However such failure can easily be triggered from the QMP shell when, > for instance, one attempts to create an object with an id that already > exists: > > For instance, call twice: > object-add qom-type=memory-backend-ram id=mem1 props.size=1073741824 > and QEMU aborts. > > This behavior is undesired as a user/management application mistake > in reusing a property ID shouldn't result in loss of the VM and live > data within. > > This patch introduces two new functions, object_property_add_err() and > object_property_add_child_err() whose prototype features an error handle. > object_property_add_child_err() now gets called from user_creatable_add_type. > This solution was chosen instead of changing the prototype of existing > functions because the number of existing callers is huge. > > The error now is returned gracefully to the QMP client. > > (QEMU) object-add qom-type=memory-backend-ram id=mem2 props.size=4294967296 > {"return": {}} > (QEMU) object-add qom-type=memory-backend-ram id=mem2 props.size=4294967296 > {"error": {"class": "GenericError", "desc": "attempt to add duplicate property > 'mem2' to object (type 'container')"}} > > Signed-off-by: Eric Auger Recent regression, my fault. Please point that out, and add Fixes: d2623129a7dec1d3041ad1221dda1ca49c667532