[GIT PULL] liveupdate: updates for 7.2-rc1

The following changes since commit e43ffb69e0438cddd72aaa30898b4dc446f664f8:

  Linux 7.1-rc6 (2026-05-31 15:14:24 -0700)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux.git tags/liveupdate-v7.2-rc1

for you to fetch changes up to e98a9c61721c14bcd29f11f4802e52e908701f7a:

  liveupdate: Document that retrieve failure is permanent (2026-06-11 15:49:51 +0300)

----------------------------------------------------------------
liveupdate: updates for 7.2-rc1

- kho: make memory preservation compatible with deferred initialization of
  the memory map

- luo: add LIVEUPDATE_SESSION_GET_NAME ioctl and parameter verification for
  LIVEUPDATE_IOCTL_CREATE_SESSION ioctl

- luo: documentation updates for liveupdate=on command line option, systemd
  support and the current compatibility status

- luo: remove the fixed limits on the number of files that can be preserved
  within a single session, and the total number of sessions managed by the
  Live Update Orchestrator

- fixes that didn't cut as urgent and were delayed until the merge window:

  * reference count incoming File-Lifecycle-Bound (FLB) data so it cannot
    be freed while a subsystem is still using it

  * fixes for a TOCTOU race in luo_session_retrieve(), a use-after-free in
    the file finish and unpreserve paths, concurrent session mutations
    during reboot and serialization on preserve_context kexec

  * make sure ioctls for incoming LUO sessions are blocked for outgoing
    sessions and vice versa

  * make sure KHO scratch size is always aligned by CMA_MIN_ALIGNMENT_BYTES

  * fix memblock tests build issue introduced by KHO changes

----------------------------------------------------------------
David Matlack (2):
      liveupdate: Use refcount_t for FLB reference counts
      liveupdate: Reference count incoming FLB data

Evangelos Petrongonas (1):
      kho: make preserved pages compatible with deferred struct page init

LongWei (1):
      kho: docs: fix typo in ABI documentation

Luca Boccassi (6):
      liveupdate: reject LIVEUPDATE_IOCTL_CREATE_SESSION with invalid name length
      selftests/liveupdate: add test cases for LIVEUPDATE_IOCTL_CREATE_SESSION calls with invalid length
      liveupdate: add LIVEUPDATE_SESSION_GET_NAME ioctl
      selftests/liveupdate: add test cases for LIVEUPDATE_SESSION_GET_NAME
      liveupdate: document systemd support
      liveupdate: document current compatibility status

Michal Clapinski (2):
      kho: fix deferred initialization of scratch areas
      selftests: kho: test with deferred struct page init

Mike Rapoport (Microsoft) (1):
      Merge patch series "liveupdate: Remove limits on sessions and files"

Pasha Tatashin (18):
      liveupdate: skip serialization for context-preserving kexec
      liveupdate: fix TOCTOU race in luo_session_retrieve()
      liveupdate: block session mutations during reboot
      liveupdate: fix u-a-f in luo_file_unpreserve_files() and luo_file_finish()
      liveupdate: Remove unused ser field from struct luo_session
      liveupdate: change file_set->count type to u64 for type safety
      liveupdate: avoid mixing cleanup guards with goto in luo_session_retrieve_fd
      liveupdate: centralize state management into struct luo_ser
      liveupdate: register luo_ser as KHO subtree
      liveupdate: Extract luo_file_deserialize_one helper
      liveupdate: Extract luo_session_deserialize_one helper
      kho: add support for linked-block serialization
      liveupdate: defer session block allocation and physical address setting
      liveupdate: Remove limit on the number of sessions
      liveupdate: Remove limit on the number of files per session
      selftests/liveupdate: Test session and file limit removal
      selftests/liveupdate: Add stress-sessions kexec test
      selftests/liveupdate: Add stress-files kexec test

Pratyush Yadav (Google) (5):
      memblock tests: define MIGRATE_CMA
      liveupdate: validate session type before performing operation
      liveupdate: document liveupdate=on
      kho: make sure scratch size is always aligned by CMA_MIN_ALIGNMENT_BYTES
      docs: memfd_preservation: fix rendering of ABI documentation

Tarun Sahu (1):
      liveupdate: Document that retrieve failure is permanent

 Documentation/core-api/kho/abi.rst                 |   5 +
 Documentation/core-api/kho/index.rst               |  11 +
 Documentation/mm/memfd_preservation.rst            |   2 +-
 Documentation/userspace-api/liveupdate.rst         |  31 ++
 MAINTAINERS                                        |   1 +
 include/linux/kho/abi/block.h                      |  54 +++
 include/linux/kho/abi/kexec_handover.h             |   4 +-
 include/linux/kho/abi/luo.h                        | 148 +++-----
 include/linux/kho_block.h                          | 106 ++++++
 include/linux/liveupdate.h                         |   9 +-
 include/linux/memblock.h                           |  21 +-
 include/uapi/linux/liveupdate.h                    |  25 +-
 kernel/kexec_core.c                                |   8 +-
 kernel/liveupdate/Kconfig                          |   2 -
 kernel/liveupdate/Makefile                         |   1 +
 kernel/liveupdate/kexec_handover.c                 |  84 +++--
 kernel/liveupdate/kho_block.c                      | 416 +++++++++++++++++++++
 kernel/liveupdate/luo_core.c                       | 103 +++--
 kernel/liveupdate/luo_file.c                       | 210 +++++------
 kernel/liveupdate/luo_flb.c                        | 112 ++----
 kernel/liveupdate/luo_internal.h                   |  18 +-
 kernel/liveupdate/luo_session.c                    | 336 ++++++++++-------
 lib/tests/liveupdate.c                             |   3 +
 mm/memblock.c                                      |  56 ++-
 mm/mm_init.c                                       |  30 +-
 tools/testing/memblock/linux/mmzone.h              |   4 +
 tools/testing/selftests/kho/vmtest.sh              |   4 +
 tools/testing/selftests/liveupdate/Makefile        |   2 +
 tools/testing/selftests/liveupdate/liveupdate.c    | 188 ++++++++++
 .../selftests/liveupdate/luo_stress_files.c        |  97 +++++
 .../selftests/liveupdate/luo_stress_sessions.c     | 102 +++++
 .../testing/selftests/liveupdate/luo_test_utils.c  |  24 ++
 .../testing/selftests/liveupdate/luo_test_utils.h  |   2 +
 33 files changed, 1635 insertions(+), 584 deletions(-)
 create mode 100644 include/linux/kho/abi/block.h
 create mode 100644 include/linux/kho_block.h
 create mode 100644 kernel/liveupdate/kho_block.c
 create mode 100644 tools/testing/selftests/liveupdate/luo_stress_files.c
 create mode 100644 tools/testing/selftests/liveupdate/luo_stress_sessions.c