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

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Message-ID: <878rra4tl6.fsf@redhat.com>
Date:   Mon, 09 May 2022 17:24:37 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Jason Wang <jasowang@...hat.com>, jasowang@...hat.com,
        mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, peterz@...radead.org, paulmck@...nel.org,
        maz@...nel.org, pasic@...ux.ibm.com, eperezma@...hat.com,
        lulu@...hat.com, sgarzare@...hat.com, xuanzhuo@...ux.alibaba.com
Subject: Re: [PATCH V4 3/9] virtio: introduce config op to synchronize vring
 callbacks

On Sat, May 07 2022, Jason Wang <jasowang@...hat.com> 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@...utronix.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Halil Pasic <pasic@...ux.ibm.com>
> Cc: Cornelia Huck <cohuck@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  include/linux/virtio_config.h | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)

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