Re: [PATCH V4 3/9] virtio: introduce config op to synchronize vring callbacks

[Cornelia Huck]

On Sat, May 07 2022, Jason Wang <jasowang@xxxxxxxxxx> wrote:

> This patch introduces new virtio config op to vring
> callbacks. Transport specific method is required to make sure the
> write before this function is visible to the vring_interrupt() that is
> called after the return of this function. For the transport that
> doesn't provide synchronize_vqs(), use synchornize_rcu() which
> synchronize with IRQ implicitly as a fallback.
>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
> Cc: Marc Zyngier <maz@xxxxxxxxxx>
> Cc: Halil Pasic <pasic@xxxxxxxxxxxxx>
> Cc: Cornelia Huck <cohuck@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
>  include/linux/virtio_config.h | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)

Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>