[RFC PATCH v1 00/18] Provide a new two step DMA API mapping API

[Christoph Hellwig]

On Mon, Jul 08, 2024 at 08:57:21PM -0300, Jason Gunthorpe wrote:
> I understand the block stack already does this using P2P and !P2P, but
> that isn't quite enough here as we want to split principally based on
> IOMMU or !IOMMU.

Except for the powerpc bypass IOMMU or not is a global decision,
and the bypass is per I/O.  So I'm not sure what else you want there?