linux-kernel - Re: [PATCH] virtio: Force DMA restricted devices through DMA API

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Message-ID: <YtbMcBw4l0LAFn9+@infradead.org>
Date:   Tue, 19 Jul 2022 08:23:28 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Keir Fraser <keirf@...gle.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, kernel-team@...roid.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio: Force DMA restricted devices through DMA API

On Tue, Jul 19, 2022 at 10:02:56AM +0000, Keir Fraser wrote:
> +#include <linux/swiotlb.h>

Drivers must never use this header.  We have a few pre-existing abuses
in the drm code, but they will go away.