These patches are taken from the LUOv4 series [1] and address recent comments from Pratyush.
This series refactors the KHO framework to better support in-kernel users like the upcoming LUO. The current design, which relies on a notifier chain and debugfs for control, is too restrictive for direct programmatic use. The core of this rework is the removal of the notifier chain in favor of a direct registration API. This decouples clients from the shutdown-time finalization sequence, allowing them to manage their preserved state more flexibly and at any time. In support of this new model, this series also: - Exports kho_finalize() and kho_abort() for programmatic control. - Makes the debugfs interface optional. - Introduces APIs to unpreserve memory and fixes a bug in the abort path where client state was being incorrectly discarded. Note that this is an interim step, as a more comprehensive fix is planned as part of the stateless KHO work [2]. - Moves all KHO code into a new kernel/liveupdate/ directory to consolidate live update components. [1] https://lore.kernel.org/all/[email protected] [2] https://lore.kernel.org/all/[email protected] Mike Rapoport (Microsoft) (1): kho: drop notifiers Pasha Tatashin (6): kho: allow to drive kho from within kernel kho: make debugfs interface optional kho: add interfaces to unpreserve folios and page ranes kho: don't unpreserve memory during abort liveupdate: kho: move to kernel/liveupdate kho: move kho debugfs directory to liveupdate Documentation/core-api/kho/concepts.rst | 2 +- MAINTAINERS | 3 +- include/linux/kexec_handover.h | 53 +- init/Kconfig | 2 + kernel/Kconfig.kexec | 15 - kernel/Makefile | 2 +- kernel/liveupdate/Kconfig | 30 ++ kernel/liveupdate/Makefile | 4 + kernel/{ => liveupdate}/kexec_handover.c | 515 ++++++++------------ kernel/liveupdate/kexec_handover_debug.c | 216 ++++++++ kernel/liveupdate/kexec_handover_internal.h | 47 ++ lib/test_kho.c | 30 +- mm/memblock.c | 60 +-- tools/testing/selftests/kho/init.c | 2 +- tools/testing/selftests/kho/vmtest.sh | 1 + 15 files changed, 553 insertions(+), 429 deletions(-) create mode 100644 kernel/liveupdate/Kconfig create mode 100644 kernel/liveupdate/Makefile rename kernel/{ => liveupdate}/kexec_handover.c (79%) create mode 100644 kernel/liveupdate/kexec_handover_debug.c create mode 100644 kernel/liveupdate/kexec_handover_internal.h base-commit: 4a71531471926e3c391665ee9c42f4e0295a4585 -- 2.51.0.618.g983fd99d29-goog
