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Tue, 26 May 2020 06:27:27 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id E09B8113864A; Tue, 26 May 2020 08:27:25 +0200 (CEST) From: Markus Armbruster To: Paolo Bonzini Subject: Re: [PATCH 50/55] s390x/event-facility: Simplify creation of SCLP event devices References: <5c6028bd-0bab-6c78-90fe-f00e23ab71b9@redhat.com> <03AEEA41-0543-4097-8FFB-9E41038F31EE@redhat.com> <87k110fqgl.fsf@dusky.pond.sub.org> <1c4c75af-a02b-e86f-23b3-a047809988bb@redhat.com> Date: Tue, 26 May 2020 08:27:25 +0200 In-Reply-To: <1c4c75af-a02b-e86f-23b3-a047809988bb@redhat.com> (Paolo Bonzini's message of "Mon, 25 May 2020 10:26:37 +0200") Message-ID: <87o8qb9po2.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 10.5.11.11 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-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/26 00:48:49 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 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: berrange@redhat.com, ehabkost@redhat.com, David Hildenbrand , Cornelia Huck , qemu-devel@nongnu.org, Halil Pasic , Christian Borntraeger , qemu-s390x@nongnu.org, Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Paolo Bonzini writes: > On 25/05/20 09:01, Markus Armbruster wrote: >>> Just remembered that we fail creating the machine and therefore abort. So not necessary :) >> True. >> >> But let's review briefly what happens when a realize method fails. >> >> In theory, realize fails cleanly, i.e. doing nothing. Another attempt >> could be made then. >> >> In practice, realize failure is always followed by destruction, unless >> preempted by outright exit(1). >> >> Destroying a device must also destroy its components. >> >> Paolo, is destroying a realized device okay, or does it have to be >> unrealized first? I can't see automatic unrealize on destruction... > > It cannot happen, because a device must be unparented before it's > destroyed and unparenting takes care of unrealizing the device. I can't see where unparenting takes care of unrealizing. Can you help me? > So the > stageobject lifetime should always proceed in this order: > > created > created, with parent > created, with parent, with bus (if applicable) > realizing > realized > unrealizing > unrealized > unrealized, without parent, with bus (if applicable) > unrealized, without parent, without bus > finalizing (without references) > finalized > freed > > Where the second and third would be fixed by moving /machine/unattached > from device_set_realized to qdev_realize. > > Paolo