On 18.07.25 12:47, Lorenzo Stoakes wrote:
On Thu, Jul 17, 2025 at 10:14:33PM +0200, David Hildenbrand wrote:
On 17.07.25 22:03, Lorenzo Stoakes wrote:
On Thu, Jul 17, 2025 at 01:52:11PM +0200, David Hildenbrand wrote:
Let's introduce vm_normal_page_pud(), which ends up being fairly simple
because of our new common helpers and there not being a PUD-sized zero
folio.
Use vm_normal_page_pud() in folio_walk_start() to resolve a TODO,
structuring the code like the other (pmd/pte) cases. Defer
introducing vm_normal_folio_pud() until really used.
I mean fine :P but does anybody really use this?
This is a unified PFN walker (!hugetlb + hugetlb), so you can easily run
into hugetlb PUDs, DAX PUDs and huge pfnmap (vfio) PUDs :)
Ahhh ok. I hate hugetlb so very very much.
Oscar is doing the Lord's work improving things but the trauma is still
there... :P
Also yeah DAX ahem.
I'm not familiar with huge pfnmap PUDs, could you give me a hint on this? :>)
vmf_insert_pfn_pmd(), called from drivers/vfio/pci/vfio_pci_core.c
Essentially, we create huge PUDs when mapping device BARs to user space.
--
Cheers,
David / dhildenb
