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Kiryl Shutsemau (Meta) 3628215f7f selftests/mm: add userfaultfd RWP tests 
Coverage for UFFDIO_REGISTER_MODE_RWP and UFFDIO_RWPROTECT:

  rwp-async          async mode — touch pages, verify permissions are
                     auto-restored without a message
  rwp-sync           sync mode — access blocks, handler resolves via
                     UFFDIO_RWPROTECT
  rwp-pagemap        PAGEMAP_SCAN reports still-cold pages via
                     inverted PAGE_IS_ACCESSED
  rwp-mprotect       RWP survives mprotect(PROT_NONE) ->
                     mprotect(PROT_READ|PROT_WRITE) round-trip
  rwp-gup            GUP walks through a protnone RWP PTE (pipe
                     write/read drives the GUP path)
  rwp-async-toggle   UFFDIO_SET_MODE flips between sync and async
                     without re-registering
  rwp-close          closing the uffd restores page permissions
  rwp-fork           RWP survives fork() with EVENT_FORK; child's
                     PTEs keep the uffd bit
  rwp-fork-pin       RWP survives fork() on an RO-longterm-pinned
                     anon page (forces copy_present_page()); child
                     read auto-resolves and clears the bit, proving
                     PAGE_NONE was in place
  rwp-wp-exclusive   register with MODE_WP|MODE_RWP returns -EINVAL

All tests run against anon, shmem, shmem-private, hugetlb, and
hugetlb-private memory, except rwp-fork-pin which is anon-only —
copy_present_page() is the private-anon pinned-exclusive fork path.

Snapshot the RWP additions into tools/include/uapi/linux/userfaultfd.h so
the selftest builds without requiring "make headers" first, matching the
mechanism established by commit 580ea358af ("selftests/mm: fix
additional build errors for selftests").

Link: https://lore.kernel.org/ak-Z9KO2mP9HMOPW@thinkstation
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Assisted-by: Claude:claude-opus-4-6
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: James Houghton <jthoughton@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-08-04 19:18:39 -07:00
..
asm tools headers: Import x86 MMIO helper overrides 2025-08-27 12:14:06 -06:00
asm-generic tools headers asm: Sync fls headers header with the kernel sources 2025-11-03 13:35:06 -03:00
generated selftests: vDSO: don't include generated headers for chacha test 2024-09-13 17:28:36 +02:00
io_uring selftests/io_uring: support NO_SQARRAY in miniliburing 2026-01-21 07:55:13 -07:00
linux mm: remove the __GFP_NO_OBJ_EXT flag 2026-07-30 19:40:44 -07:00
nolibc tools/nolibc: cast default values of program_invocation_name 2026-05-26 21:06:12 +02:00
perf KVM: selftests: aarch64: Update tools copy of arm_pmuv3.h 2023-12-12 09:46:22 +00:00
tools
trace/events
uapi selftests/mm: add userfaultfd RWP tests 2026-08-04 19:18:39 -07:00
vdso tools headers: Update the linux/unaligned.h copy with the kernel sources 2026-01-14 08:56:41 +01:00