On 17.10.24 18:47, Jason Gunthorpe wrote:
On Thu, Oct 17, 2024 at 10:58:29AM -0400, Peter Xu wrote:
My question was more torwards whether gmemfd could still expose the
possibility to be used in VA forms to other modules that may not support
fd+offsets yet.
I keep hearing they don't want to support page pinning on a guestmemfd
mapping, so VA based paths could not work.
For shared pages it absolutely must work. That's what I keep hearing :)
I think as long as we can provide gmemfd VMAs like what this series
provides, it sounds possible to reuse the old VA interfaces before the CoCo
interfaces are ready, so that people can already start leveraging gmemfd
backing pages.
And you definitely can't get the private pages out of the VA interface
because all the VMA PTEs of private pages are non-present by definition.
Agreed.
--
Cheers,
David / dhildenb
