[Virtio-fs] [PATCH v4 0/8] fuse,virtiofs: support per-file DAX

[Miklos Szeredi]

On Wed, 18 Aug 2021 at 05:40, JeffleXu <jefflexu at linux.alibaba.com> wrote:

> I'm not sure if I fully understand your idea. Then in this case, host
> daemon only prepares 4KB while guest thinks that the whole DAX window
> (e.g., 2MB) has been fully mapped. Then when guest really accesses the
> remained part (2MB - 4KB), page fault is triggered, and now host daemon
> is responsible for downloading the remained part?

Yes.  Mapping an area just means setting up the page tables, it does
not result in actual data transfer.

Thanks,
Miklos