[PATCH v2 0/3] util/userfaultfd: Support /dev/userfaultfd

[Peter Xu <peterx@redhat.com>]

v2:
- Added R-bs for Phil
- Move open_mode into uffd_detect_open_mode() [Phil]
- Document uffd_open() in the header file [Phil]
- [Discussed with Daniel/Michal, decided to leave fd support for later]

The new /dev/userfaultfd handle is superior to the system call with a
better permission control and also works for a restricted seccomp
environment.

The new device was only introduced in v6.1 so we need a header update.

Please have a look, thanks.

Peter Xu (3):
  linux-headers: Update to v6.1
  util/userfaultfd: Add uffd_open()
  util/userfaultfd: Support /dev/userfaultfd

 include/qemu/userfaultfd.h                    |   8 +
 include/standard-headers/drm/drm_fourcc.h     |  34 ++++-
 include/standard-headers/linux/ethtool.h      |  63 +++++++-
 include/standard-headers/linux/fuse.h         |   6 +-
 .../linux/input-event-codes.h                 |   1 +
 include/standard-headers/linux/virtio_blk.h   |  19 +++
 linux-headers/asm-generic/hugetlb_encode.h    |  26 ++--
 linux-headers/asm-generic/mman-common.h       |   2 +
 linux-headers/asm-mips/mman.h                 |   2 +
 linux-headers/asm-riscv/kvm.h                 |   4 +
 linux-headers/linux/kvm.h                     |   1 +
 linux-headers/linux/psci.h                    |  14 ++
 linux-headers/linux/userfaultfd.h             |   4 +
 linux-headers/linux/vfio.h                    | 142 ++++++++++++++++++
 migration/postcopy-ram.c                      |  11 +-
 tests/qtest/migration-test.c                  |   3 +-
 util/trace-events                             |   1 +
 util/userfaultfd.c                            |  50 +++++-
 18 files changed, 362 insertions(+), 29 deletions(-)

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2.37.3