Re: [Qemu-devel] [PATCH v1 1/2] virtio-blk: data-plane: fix save/set .complete_request in start

[Fam Zheng <famz@redhat.com>]

On Sat, 07/05 12:18, Ming Lei wrote:
> The callback has to be saved and reset in virtio_blk_data_plane_start(),
> otherwise dataplane's requests will be completed in qemu aio context.

Yes, the cb is wrong once virtio_blk_data_plane_stop is called (device reset,
etc.).

Reviewed-by: Fam Zheng <famz@redhat.com>

> 
> Signed-off-by: Ming Lei <ming.lei@canonical.com>
> ---
>  hw/block/dataplane/virtio-blk.c |    7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
> index 227bb15..e88862d 100644
> --- a/hw/block/dataplane/virtio-blk.c
> +++ b/hw/block/dataplane/virtio-blk.c
> @@ -125,7 +125,6 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk,
>                                    Error **errp)
>  {
>      VirtIOBlockDataPlane *s;
> -    VirtIOBlock *vblk = VIRTIO_BLK(vdev);
>      Error *local_err = NULL;
>      BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
>      VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
> @@ -178,8 +177,6 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk,
>      bdrv_op_block_all(blk->conf.bs, s->blocker);
>  
>      *dataplane = s;
> -    s->saved_complete_request = vblk->complete_request;
> -    vblk->complete_request = complete_request_vring;
>  }
>  
>  /* Context: QEMU global mutex held */
> @@ -201,6 +198,7 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
>  {
>      BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s->vdev)));
>      VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
> +    VirtIOBlock *vblk = VIRTIO_BLK(s->vdev);
>      VirtQueue *vq;
>  
>      if (s->started) {
> @@ -234,6 +232,9 @@ void virtio_blk_data_plane_start(VirtIOBlockDataPlane *s)
>      }
>      s->host_notifier = *virtio_queue_get_host_notifier(vq);
>  
> +    s->saved_complete_request = vblk->complete_request;
> +    vblk->complete_request = complete_request_vring;
> +
>      s->starting = false;
>      s->started = true;
>      trace_virtio_blk_data_plane_start(s);
> -- 
> 1.7.9.5
> 
>