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Tsirkin" , Harpreet Singh Anand , Laurent Vivier , Shannon Nelson , Lei Yang , Dragos Tatulea Subject: [PATCH 2/7] vdpa: add should_enable op Date: Fri, 28 Jul 2023 19:20:23 +0200 Message-Id: <20230728172028.2074052-3-eperezma@redhat.com> In-Reply-To: <20230728172028.2074052-1-eperezma@redhat.com> References: <20230728172028.2074052-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eperezma@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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org To restore the device at the destination of a live migration we send the commands through control virtqueue. For a device to read CVQ it must have received the DRIVER_OK status bit. However this opens a window where the device could start receiving packets in rx queue 0 before it receives the RSS configuration. To avoid that, we will not send vring_enable until all configuration is used by the device. As a first step, enable a new vitio ops per vhost_vdpa device to know if we should enable a virtqueue or not. This srtuct can be reused in the future to add more actions to vhost_vdpa that depend on the virtIO kind of device. Signed-off-by: Eugenio Pérez --- include/hw/virtio/vhost-vdpa.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/hw/virtio/vhost-vdpa.h b/include/hw/virtio/vhost-vdpa.h index 5407d54fd7..3d330d439a 100644 --- a/include/hw/virtio/vhost-vdpa.h +++ b/include/hw/virtio/vhost-vdpa.h @@ -30,6 +30,13 @@ typedef struct VhostVDPAHostNotifier { void *addr; } VhostVDPAHostNotifier; +struct vhost_vdpa; +typedef bool (*vhost_vdpa_virtio_should_enable_op)(const struct vhost_vdpa *v); + +typedef struct VhostVDPAVirtIOOps { + vhost_vdpa_virtio_should_enable_op should_enable; +} VhostVDPAVirtIOOps; + typedef struct vhost_vdpa { int device_fd; int index; @@ -48,6 +55,7 @@ typedef struct vhost_vdpa { VhostIOVATree *iova_tree; GPtrArray *shadow_vqs; const VhostShadowVirtqueueOps *shadow_vq_ops; + const VhostVDPAVirtIOOps *virtio_ops; void *shadow_vq_ops_opaque; struct vhost_dev *dev; Error *migration_blocker;