On Mon, Jan 23, 2023 at 03:11:20PM +0500, Muhammad Usama Anjum wrote: > > One thing worth mention is, I think for async wp it doesn't need to be > > restricted by UFFD_USER_MODE_ONLY, because comparing to the sync messages > > it has no risk of being utilized for malicious purposes. > I think with updated handling path updated in do_wp_page() and > wp_huge_pmd() in version, UFFD_USER_MODE_ONLY will not affect us. This is more or less a comment for the design, the new code should work (by bypassing handle_userfaultfd(), where this bit was checked). We'll need an man page update if this feature will be merged [1], and if so it'll need to be updated for the UFFD_USER_MODE_ONLY section regarding to async uffd-wp support too. I think that can also be worked out after the series being accepted first, so just a heads up. [1] https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git -- Peter Xu
