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Tsirkin" , "Dr . David Alan Gilbert" , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Markus Armbruster , Eduardo Habkost , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Alex Williamson , Paolo Bonzini , Peter Maydell Subject: [PATCH 3/4] migration: Make migration object a singleton object Date: Thu, 24 Oct 2024 12:56:26 -0400 Message-ID: <20241024165627.1372621-4-peterx@redhat.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20241024165627.1372621-1-peterx@redhat.com> References: <20241024165627.1372621-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.263, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1729789094489116600 Content-Type: text/plain; charset="utf-8" This makes the migration object a singleton unit. After this, we can do something slightly tricky later on with the guarantee that nobody will be able to create the object twice. Signed-off-by: Peter Xu --- migration/migration.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/migration/migration.c b/migration/migration.c index bcb735869b..1b5285af95 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -45,6 +45,7 @@ #include "qapi/qmp/qerror.h" #include "qapi/qmp/qnull.h" #include "qemu/rcu.h" +#include "qom/object_interfaces.h" #include "postcopy-ram.h" #include "qemu/thread.h" #include "trace.h" @@ -3855,11 +3856,19 @@ fail: migrate_fd_cleanup(s); } =20 +static Object* migration_get_instance(Error **errp) +{ + return OBJECT(current_migration); +} + static void migration_class_init(ObjectClass *klass, void *data) { DeviceClass *dc =3D DEVICE_CLASS(klass); + SingletonClass *singleton =3D SINGLETON_CLASS(klass); =20 dc->user_creatable =3D false; + singleton->get_instance =3D migration_get_instance; + device_class_set_props(dc, migration_properties); } =20 @@ -3932,6 +3941,10 @@ static const TypeInfo migration_type =3D { .instance_size =3D sizeof(MigrationState), .instance_init =3D migration_instance_init, .instance_finalize =3D migration_instance_finalize, + .interfaces =3D (InterfaceInfo[]) { + { TYPE_SINGLETON }, + { } + } }; =20 static void register_migration_types(void) --=20 2.45.0