Re: [Qemu-block] [PATCH v3 12/12] virtio-scsi-dataplane: Add "device IO" op blocker listener

[Paolo Bonzini]

On 15/05/2015 08:04, Fam Zheng wrote:
> @@ -111,6 +111,10 @@ static void 
> virtio_scsi_iothread_handle_ctrl(EventNotifier *notifier)
>      VirtIOSCSI *s = VIRTIO_SCSI(vring->parent);
>      VirtIOSCSIReq *req;
>  
> +    if (s->pause_counter) {
> +        virtio_scsi_stop_ioeventfd(s);
> +        return;
> +    }
>      event_notifier_test_and_clear(notifier);
>      while ((req = virtio_scsi_pop_req_vring(s, vring))) {
>          virtio_scsi_handle_ctrl_req(s, req);
> @@ -124,6 +128,10 @@ static void 
> virtio_scsi_iothread_handle_event(EventNotifier *notifier)
>      VirtIOSCSI *s = vring->parent;
>      VirtIODevice *vdev = VIRTIO_DEVICE(s);
>  
> +    if (s->pause_counter) {
> +        virtio_scsi_stop_ioeventfd(s);
> +        return;
> +    }
>      event_notifier_test_and_clear(notifier);
>  
>      if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {

Why are these needed?

Paolo