On Thu, Feb 06, 2025 at 08:37:07AM -0500, Vivek Goyal wrote:

And then there are challenges at QEMU level. virtiofsd needs additional
vhost-user commands to implement DAX and these never went upstream in
QEMU. I hope these challenges are sorted at some point of time.

Albert Esteve has been working on QEMU support:
https://lore.kernel.org/qemu-devel/20240912145335.129447-1-aesteve@redhat.com/ (local)

He has a viable solution. I think the remaining issue is how to best
structure the memory regions. The reason for slow progress is not
because it can't be done, it's probably just because this is a
background task.

Please discuss with Albert if QEMU support is urgent.

Stefan