Re: [PATCH V6 7/9] virtio: allow to unbreak virtqueue

[Cornelia Huck <cohuck@redhat.com>]

On Fri, May 27 2022, Jason Wang <jasowang@redhat.com> wrote:

> This patch allows the new introduced __virtio_break_device() to
> unbreak the virtqueue.
>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: "Paul E. McKenney" <paulmck@kernel.org>
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: Halil Pasic <pasic@linux.ibm.com>
> Cc: Cornelia Huck <cohuck@redhat.com>
> Cc: Vineeth Vijayan <vneethv@linux.ibm.com>
> Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
> Cc: linux-s390@vger.kernel.org
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  drivers/virtio/virtio_ring.c | 22 ++++++++++++++++++++++
>  include/linux/virtio.h       |  1 +
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 9d0bae4293be..9c231e1fded7 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -2395,6 +2395,28 @@ void virtio_break_device(struct virtio_device *dev)
>  }
>  EXPORT_SYMBOL_GPL(virtio_break_device);
>  
> +/*
> + * This should allow the device to be used by the driver. You may
> + * need to grab appropriate locks to flush the write to
> + * vq->broken. This should only be used in some specific case e.g
> + * (probing and restoring). This function should only be called by the

Minor: "...some specific cases, e.g. probing and restoring."

But no need to respin from my side.

> + * core, not directly by the driver.
> + */

Reviewed-by: Cornelia Huck <cohuck@redhat.com>