[PATCH 3/6] vfio: remove the unused mdev iommu hook

[Christoph Hellwig]

On Wed, Jun 30, 2021 at 09:08:19AM +0000, Tian, Kevin wrote:
> The iommu layer should maintain above attaching status per device and per
> iommu domain. There is no mdev/subdev concept in the iommu layer. It's
> just about RID or PASID.

Yes, I think that makes sense.

> And a new set of IOMMU-API:
> 
>     - iommu_{un}bind_pgtable(domain, dev, addr);
>     - iommu_{un}bind_pgtable_pasid(domain, dev, addr, pasid);
>     - iommu_cache_invalidate(domain, dev, invalid_info);

What caches is this supposed to "invalidate"?