On Mon, Mar 25, 2024 at 03:55:53PM +0100, Christophe Leroy wrote: > This series reimplements hugepages with hugepd on powerpc 8xx. > > Unlike most architectures, powerpc 8xx HW requires a two-level > pagetable topology for all page sizes. So a leaf PMD-contig approach > is not feasible as such. > > Possible sizes are 4k, 16k, 512k and 8M. > > First level (PGD/PMD) covers 4M per entry. For 8M pages, two PMD entries > must point to a single entry level-2 page table. Until now that was > done using hugepd. This series changes it to use standard page tables > where the entry is replicated 1024 times on each of the two pagetables > refered by the two associated PMD entries for that 8M page. > > At the moment it has to look into each helper to know if the > hugepage ptep is a PTE or a PMD in order to know it is a 8M page or > a lower size. I hope this can me handled by core-mm in the future. > > There are probably several ways to implement stuff, so feedback is > very welcome. I thought it looks pretty good! Thanks, Jason
