On Tue, Jul 29, 2025 at 05:13:51PM -0300, Jason Gunthorpe wrote:

On Tue, Jul 29, 2025 at 08:44:21PM +0100, Robin Murphy wrote:

quoted

In this case with just one single
contiguous mapping, it is clearly objectively worse to have to bounce in and
out of the IOMMU layer 3 separate times and store a dma_map_state,

The non-contiguous mappings are comming back, it was in earlier drafts
of this. Regardless, the point is to show how to use the general API
that we would want to bring into the DRM drivers that don't have
contiguity even though VFIO is a bit special.

Yes, we will see comeback of DMA ranges in v2.

Thanks