Hello,
these userfaultfd features are finished and are ready for larger
exposure in -mm and upstream merging.
1) tmpfs non present userfault
2) hugetlbfs non present userfault
3) non cooperative userfault for fork/madvise/mremap
qemu development code is already exercising 2) and container postcopy
live migration needs 3).
1) is not currently used but there's a self test and we know some qemu
user for various reasons uses tmpfs as backing for KVM so it'll need
it too to use postcopy live migration with tmpfs memory.
In addition there's a few related pending fixes and cleanups.
The "mm: mprotect: use pmd_trans_unstable instead of taking the
pmd_lock" patch is actually required for the WP support that will come
later, but it looks a nice cleanup + optimization for upstream too so
I'm sending it already.
Andrea Arcangeli (10):
userfaultfd: document _IOR/_IOW
userfaultfd: correct comment about UFFD_FEATURE_PAGEFAULT_FLAG_WP
userfaultfd: convert BUG() to WARN_ON_ONCE()
userfaultfd: use vma_is_anonymous
userfaultfd: non-cooperative: report all available features to
userland
userfaultfd: non-cooperative: Add fork() event, build warning fix
userfaultfd: shmem: add tlbflush.h header for microblaze
userfaultfd: shmem: lock the page before adding it to pagecache
userfaultfd: shmem: avoid leaking blocks and used blocks in
UFFDIO_COPY
mm: mprotect: use pmd_trans_unstable instead of taking the pmd_lock
Mike Kravetz (7):
userfaultfd: hugetlbfs: add copy_huge_page_from_user for hugetlb
userfaultfd support
userfaultfd: hugetlbfs: add hugetlb_mcopy_atomic_pte for userfaultfd
support
userfaultfd: hugetlbfs: add __mcopy_atomic_hugetlb for huge page
UFFDIO_COPY
userfaultfd: hugetlbfs: add userfaultfd hugetlb hook
userfaultfd: hugetlbfs: allow registration of ranges containing huge
pages
userfaultfd: hugetlbfs: add userfaultfd_hugetlb test
userfaultfd: hugetlbfs: userfaultfd_huge_must_wait for hugepmd ranges
Mike Rapoport (11):
userfaultfd: non-cooperative: dup_userfaultfd: use mm_count instead of
mm_users
userfaultfd: introduce vma_can_userfault
userfaultfd: shmem: add shmem_mcopy_atomic_pte for userfaultfd support
userfaultfd: shmem: introduce vma_is_shmem
userfaultfd: shmem: use shmem_mcopy_atomic_pte for shared memory
userfaultfd: shmem: add userfaultfd hook for shared memory faults
userfaultfd: shmem: allow registration of shared memory ranges
userfaultfd: shmem: add userfaultfd_shmem test
userfaultfd: non-cooperative: selftest: introduce userfaultfd_open
userfaultfd: non-cooperative: selftest: add ufd parameter to copy_page
userfaultfd: non-cooperative: selftest: add test for FORK,
MADVDONTNEED and REMAP events
Pavel Emelyanov (5):
userfaultfd: non-cooperative: Split the find_userfault() routine
userfaultfd: non-cooperative: Add ability to report non-PF events from
uffd descriptor
userfaultfd: non-cooperative: Add fork() event
userfaultfd: non-cooperative: Add mremap() event
userfaultfd: non-cooperative: Add madvise() event for MADV_DONTNEED
request
fs/userfaultfd.c | 445 +++++++++++++++++++++++++++++--
include/linux/hugetlb.h | 8 +-
include/linux/mm.h | 13 +
include/linux/shmem_fs.h | 11 +
include/linux/userfaultfd_k.h | 42 +++
include/uapi/asm-generic/ioctl.h | 10 +-
include/uapi/linux/userfaultfd.h | 39 ++-
kernel/fork.c | 10 +-
mm/hugetlb.c | 114 ++++++++
mm/madvise.c | 2 +
mm/memory.c | 25 ++
mm/mprotect.c | 44 ++-
mm/mremap.c | 17 +-
mm/shmem.c | 159 ++++++++++-
mm/userfaultfd.c | 211 ++++++++++++++-
tools/testing/selftests/vm/Makefile | 8 +
tools/testing/selftests/vm/run_vmtests | 24 ++
tools/testing/selftests/vm/userfaultfd.c | 405 +++++++++++++++++++++++++---
18 files changed, 1453 insertions(+), 134 deletions(-)
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