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SubjectRe: [RFC 2/4] virtio: Override device's DMA OPS with virtio_direct_dma_ops selectively
On 07/30/2018 02:55 PM, Christoph Hellwig wrote:
>> +const struct dma_map_ops virtio_direct_dma_ops;
> This belongs into a header if it is non-static. If you only
> use it in this file anyway please mark it static and avoid a forward
> declaration.

Sure, will make it static, move the definition up in the file to avoid
forward declaration.

>> +
>> int virtio_finalize_features(struct virtio_device *dev)
>> {
>> int ret = dev->config->finalize_features(dev);
>> @@ -174,6 +176,9 @@ int virtio_finalize_features(struct virtio_device *dev)
>> if (ret)
>> return ret;
>> + if (virtio_has_iommu_quirk(dev))
>> + set_dma_ops(dev->dev.parent, &virtio_direct_dma_ops);
> This needs a big fat comment explaining what is going on here.

Sure, will do. Also talk about the XEN domain exception as well once
that goes into this conditional statement.

> Also not new, but I find the existance of virtio_has_iommu_quirk and its
> name horribly confusing. It might be better to open code it here once
> only a single caller is left.

Sure will do. There is one definition in the tools directory which can
be removed and then this will be the only one left.

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