Re: [PATCH V6 3/9] virtio: introduce config op to synchronize vring callbacks

Stefano Garzarella
2022-05-27T10:36:44Z

On Fri, May 27, 2022 at 02:01:14PM +0800, Jason Wang 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@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
>Reviewed-by: Cornelia Huck <cohuck@redhat.com>
>Signed-off-by: Jason Wang <jasowang@redhat.com>
>---
> include/linux/virtio_config.h | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>