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Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Jonah Palmer Subject: [PULL 06/46] virtio: Prevent creation of device using notification-data with ioeventfd Message-ID: <1c854365ece00579e5bfe19c1ce04e80a76f4a0b.1717527933.git.mst@redhat.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent 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=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: 1717528258820100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jonah Palmer Prevent the realization of a virtio device that attempts to use the VIRTIO_F_NOTIFICATION_DATA transport feature without disabling ioeventfd. Due to ioeventfd not being able to carry the extra data associated with this feature, having both enabled is a functional mismatch and therefore Qemu should not continue the device's realization process. Although the device does not yet know if the feature will be successfully negotiated, many devices using this feature wont actually work without this extra data and would fail FEATURES_OK anyway. If ioeventfd is able to work with the extra notification data in the future, this compatibility check can be removed. Signed-off-by: Jonah Palmer Message-Id: <20240315165557.26942-3-jonah.palmer@oracle.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/virtio.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index f7c99e3a96..28cd406e16 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2980,6 +2980,20 @@ int virtio_set_features(VirtIODevice *vdev, uint64_t= val) return ret; } =20 +static void virtio_device_check_notification_compatibility(VirtIODevice *v= dev, + Error **errp) +{ + VirtioBusState *bus =3D VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev))); + VirtioBusClass *k =3D VIRTIO_BUS_GET_CLASS(bus); + DeviceState *proxy =3D DEVICE(BUS(bus)->parent); + + if (virtio_host_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA) && + k->ioeventfd_enabled(proxy)) { + error_setg(errp, + "notification_data=3Don without ioeventfd=3Doff is not = supported"); + } +} + size_t virtio_get_config_size(const VirtIOConfigSizeParams *params, uint64_t host_features) { @@ -3740,6 +3754,14 @@ static void virtio_device_realize(DeviceState *dev, = Error **errp) } } =20 + /* Devices should not use both ioeventfd and notification data feature= */ + virtio_device_check_notification_compatibility(vdev, &err); + if (err !=3D NULL) { + error_propagate(errp, err); + vdc->unrealize(dev); + return; + } + virtio_bus_device_plugged(vdev, &err); if (err !=3D NULL) { error_propagate(errp, err); --=20 MST