Re: [PATCH vhost v6 08/11] virtio_ring: introduce virtqueue_dma_dev()

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On Tue, Apr 11, 2023 at 12:54:46PM +0800, Jason Wang wrote:
> Ok, just to clarify, I meant there could be a case where the virtqueue
> is emulated by software, in this case we need check whether the
> virtqueue has a dma device or not in vring_use_dma_api(). If not we
> need return false.

Well, that's what vring_use_dma_api basically does.  Such devics
just should never have VIRTIO_F_ACCESS_PLATFORM set.  If there is
a really good reason for such a device to have VIRTIO_F_ACCESS_PLATFORM
set we'd need an extra quirk in vring_use_dma_api indeed.
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