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* [PATCH v1 0/2] mm: uffd-wp + change_protection() cleanups
@ 2022-12-23 15:56 David Hildenbrand
  2022-12-23 15:56 ` [PATCH v1 1/2] mm/userfaultfd: rely on vma->vm_page_prot in uffd_wp_range() David Hildenbrand
  2022-12-23 15:56 ` [PATCH v1 2/2] mm/mprotect: drop pgprot_t parameter from change_protection() David Hildenbrand
  0 siblings, 2 replies; 7+ messages in thread
From: David Hildenbrand @ 2022-12-23 15:56 UTC (permalink / raw)
  To: linux-kernel
  Cc: linux-mm, David Hildenbrand, Andrew Morton, Peter Xu,
	Hugh Dickins, Andrea Arcangeli, Nadav Amit

Based on linus/master and [1]:
  "mm/userfaultfd: enable writenotify while userfaultfd-wp is enabled for a
   VMA"

Cleanup page protection handling in uffd-wp when calling
change_protection() and improve unprotecting uffd=wp in private mappings,
trying to set PTEs writable again if possible just like we do during
mprotect() when upgrading write permissions. Make the change_protection()
interface harder to get wrong :)

I consider both pages primarily cleanups, although patch #1 fixes a
corner case with uffd-wp and softdirty tracking for shmem. @Peter, please
let me know if we should flag patch #1 as pure cleanup -- I have no idea
how important softdirty tracking on shmem is.

Survives my simple test case + selftests/vm.

Last patch series before Christmas; happy holidays everyone!

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nadav Amit <nadav.amit@gmail.com>

[1] https://lore.kernel.org/all/20221209080912.7968-1-david@redhat.com/T/#u

David Hildenbrand (2):
  mm/userfaultfd: rely on vma->vm_page_prot in uffd_wp_range()
  mm/mprotect: drop pgprot_t parameter from change_protection()

 include/linux/mm.h |  3 +--
 mm/mempolicy.c     |  3 +--
 mm/mprotect.c      | 14 +++++++++++---
 mm/userfaultfd.c   | 17 ++++++++++++-----
 4 files changed, 25 insertions(+), 12 deletions(-)

-- 
2.38.1


^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2022-12-24 17:02 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-12-23 15:56 [PATCH v1 0/2] mm: uffd-wp + change_protection() cleanups David Hildenbrand
2022-12-23 15:56 ` [PATCH v1 1/2] mm/userfaultfd: rely on vma->vm_page_prot in uffd_wp_range() David Hildenbrand
2022-12-24 16:59   ` David Hildenbrand
2022-12-23 15:56 ` [PATCH v1 2/2] mm/mprotect: drop pgprot_t parameter from change_protection() David Hildenbrand
2022-12-24  3:08   ` kernel test robot
2022-12-24  4:59   ` kernel test robot
2022-12-24 17:01   ` David Hildenbrand

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