Re: [PATCH 4/6] iommu/generic_pt: Add Broadcom BCM2712 page table format

[Jason Gunthorpe]

On Mon, Jul 13, 2026 at 11:02:15AM +0100, Nick Hollinghurst wrote:
> Hi Daniel,
> 
> On Sun, 12 Jul 2026 at 22:19, Daniel Drake <dan@xxxxxxxxxxxxxxx> wrote:
> >
> > The BCM2712 IOMMU implements a 2-level page table format. It is relatively
> > simple, with one unusual aspect: leaf entries can only be installed at
> > Level 0.
> 
> I should admit that a single-level huge page mapping is possible, but
> I was too lazy to implement it (and haven't much tested it).
> 
> It can be done by setting bits 31, 30 and 28 of the top-level entry
> (all other combinations of bits 31, 30 will point to a  next-level
> table). The page number is in 4K units but must be 4MB aligned.

Let's do that instead of the weird full level contiguation page thing
please

Jason