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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1720449036; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Vp3QXicmwzRQ2pwcooQ3iJyhC+RNAMVLkShP5mrWX7I=; b=R/XDxOzCrntsdOUjfsRKlwmufdvvB6piFdP+BT2e8tj7L2VRIQxfTs1SV03qbm6g3jfX50 fWUKFb3Qha8mQKx8QCVtj90e7MdjpdFvC+p5GW0GwS51cJ55E6skk/JQfZmPgJ7gmYB1x7 5+5WxpZkb6DbI+p5kJC6+6NsPWC8aQE= X-MC-Unique: CXs4h0T4OvKYYPhPn6yhfg-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Eduardo Habkost , Paolo Bonzini , Stefan Hajnoczi , Markus Armbruster Subject: [PATCH] qdev-monitor: QAPIfy QMP device_add Date: Mon, 8 Jul 2024 16:30:27 +0200 Message-ID: <20240708143027.480821-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 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=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.142, 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_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: 1720449106531100003 The QMP device_add monitor command converts the QDict arguments to QemuOpts and then back again to QDict. This process only supports scalar types. Device properties like virtio-blk-pci's iothread-vq-mapping (an array of objects) are silently dropped by qemu_opts_from_qdict() during the QemuOpts conversion even though QAPI is capable of validating them. As a result, hotplugging virtio-blk-pci devices with the iothread-vq-mapping property does not work as expected (the property is ignored). It's time to QAPIfy QMP device_add! Get rid of the QemuOpts conversion in qmp_device_add() and call qdev_device_add_from_qdict() with from_json=3Dtrue. Using the QMP command's QDict arguments directly allows non-scalar properties. The HMP is also adjusted since qmp_device_add()'s now expects properly typed JSON arguments and cannot be used from HMP anymore. Move the code that was previously in qmp_device_add() (with QemuOpts conversion and from_json=3Dfalse) into hmp_device_add() so that its behavior is unchanged. This patch changes the behavior of QMP device_add but not HMP device_add. QMP clients that sent incorrectly typed device_add QMP commands no longer work. This is a breaking change but clients should be using the correct types already. See the netdev_add QAPIfication in commit db2a380c8457 for similar reasoning. Markus helped me figure this out and even provided a draft patch. The code ended up very close to what he suggested. Suggested-by: Markus Armbruster Cc: Daniel P. Berrang=C3=A9 Signed-off-by: Stefan Hajnoczi Reviewed-by: Daniel P. Berrang=C3=A9 --- system/qdev-monitor.c | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-) diff --git a/system/qdev-monitor.c b/system/qdev-monitor.c index 6af6ef7d66..1427aa173c 100644 --- a/system/qdev-monitor.c +++ b/system/qdev-monitor.c @@ -849,18 +849,9 @@ void hmp_info_qdm(Monitor *mon, const QDict *qdict) =20 void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp) { - QemuOpts *opts; DeviceState *dev; =20 - opts =3D qemu_opts_from_qdict(qemu_find_opts("device"), qdict, errp); - if (!opts) { - return; - } - if (!monitor_cur_is_qmp() && qdev_device_help(opts)) { - qemu_opts_del(opts); - return; - } - dev =3D qdev_device_add(opts, errp); + dev =3D qdev_device_add_from_qdict(qdict, true, errp); if (!dev) { /* * Drain all pending RCU callbacks. This is done because @@ -872,8 +863,6 @@ void qmp_device_add(QDict *qdict, QObject **ret_data, E= rror **errp) * to the user */ drain_call_rcu(); - - qemu_opts_del(opts); return; } object_unref(OBJECT(dev)); @@ -967,8 +956,34 @@ void qmp_device_del(const char *id, Error **errp) void hmp_device_add(Monitor *mon, const QDict *qdict) { Error *err =3D NULL; + QemuOpts *opts; + DeviceState *dev; =20 - qmp_device_add((QDict *)qdict, NULL, &err); + opts =3D qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &err); + if (!opts) { + goto out; + } + if (qdev_device_help(opts)) { + qemu_opts_del(opts); + return; + } + dev =3D qdev_device_add(opts, &err); + if (!dev) { + /* + * Drain all pending RCU callbacks. This is done because + * some bus related operations can delay a device removal + * (in this case this can happen if device is added and then + * removed due to a configuration error) + * to a RCU callback, but user might expect that this interface + * will finish its job completely once qmp command returns result + * to the user + */ + drain_call_rcu(); + + qemu_opts_del(opts); + } + object_unref(OBJECT(dev)); +out: hmp_handle_error(mon, err); } =20 --=20 2.45.2