| Message ID | 20230706191227.835526-3-eperezma@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | Enable vdpa net migration with features depending on CVQ | expand |
On Fri, Jul 7, 2023 at 3:12 AM Eugenio Pérez <eperezma@redhat.com> wrote: > > 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. I think this can also happen in the case of automatic steering. > 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 typo. Thanks > future to add more actions to vhost_vdpa that depend on the virtIO kind > of device. > > Signed-off-by: Eugenio Pérez <eperezma@redhat.com> > --- > 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; > -- > 2.39.3 >
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;
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 <eperezma@redhat.com> --- include/hw/virtio/vhost-vdpa.h | 8 ++++++++ 1 file changed, 8 insertions(+)