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From:   Cornelia Huck <cohuck@redhat.com>
To:     Jason Wang <jasowang@redhat.com>, jasowang@redhat.com,
        mst@redhat.com, virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org
Cc:     tglx@linutronix.de, peterz@infradead.org, paulmck@kernel.org,
        maz@kernel.org, pasic@linux.ibm.com, eperezma@redhat.com,
        lulu@redhat.com, sgarzare@redhat.com, xuanzhuo@linux.alibaba.com
Subject: Re: [PATCH V4 3/9] virtio: introduce config op to synchronize vring
 callbacks
In-Reply-To: <20220507071954.14455-4-jasowang@redhat.com>
Organization: Red Hat GmbH
References: <20220507071954.14455-1-jasowang@redhat.com>
 <20220507071954.14455-4-jasowang@redhat.com>
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Date:   Mon, 09 May 2022 17:24:37 +0200
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On Sat, May 07 2022, Jason Wang <jasowang@redhat.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@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>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  include/linux/virtio_config.h | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)

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