Re: [PATCH V7 6/9] iommufd: pfn reader for file mappings

[Jason Gunthorpe <jgg@nvidia.com>]

On Thu, Nov 07, 2024 at 09:00:50PM +1100, Alexey Kardashevskiy wrote:
> I was initially pointed at this patchset as an example of how my guest_memfd
> pinning of private memory (CoCo VM) should look like. And so far it's been
> good except the actual pinning part - memfd_pin_folios() - expects the file
> to be shmem or hugetlbfs and guest_memfd is neither (well, last couple of
> months). Is there any plan to add those? If none, I will then, just wanted
> to check. At the moment I do what KVM does which is calling
> filemap_grab_folio(). Thanks,

I understood that the guestmemfd folks really don't want typical
pinning behavior, you'll probably have to negotiate with them on
exactly what the interface is?

I though KVM had its own private interface to guestmemfd?

Jason