On Wed, Sep 21, 2022 at 03:11:34PM -0300, Jason Gunthorpe wrote: > 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. But device has to know what bits of the virtual address are significant to handle device TLB lookup/store correctly, no? -- Kiryl Shutsemau / Kirill A. Shutemov
