On Wed, Sep 21, 2022 at 10:11:46AM -0700, Dave Hansen wrote: > Are you saying that any device compatibility with an mm is solely > determined by the IOMMU in play, so the IOMMU code should host the mm > compatibility checks? Yes, exactly. Only the HW entity that walks the page tables needs to understand their parsing rules and in this case that is only the IOMMU block. Jason