linux-stable.git/tools/testing/selftests/liveupdate, branch master

selftests/liveupdate: Move luo_test_utils.* into a reusable library

2026-07-26T08:28:41+00:00

Move luo_test_utils.[ch] into a lib/ directory and make libliveupdate
library. Pull the rules to build them out into a separate
libliveupdate.mk script. This will enable these utilities to be
also built by and used within other selftests (such as VFIO).

Update path in vmtest.sh as that one uses hardcoded path for util.

No functional change intended.

Co-developed-by: David Matlack 
Signed-off-by: David Matlack 
Acked-by: Pratyush Yadav (Google) 
Reviewed-by: Pasha Tatashin 
Signed-off-by: Vipin Sharma 
Link: https://patch.msgid.link/20260720203202.1964557-3-vipinsh@google.com
Signed-off-by: Mike Rapoport (Microsoft)

selftests/liveupdate: Use luo_test_utils.c for liveupdate ioctl APIs

2026-07-26T08:28:41+00:00

Use luo_test_utils.c for all live update ioctl calls. Remove direct
ioctl calls in liveupdate.c. This avoids code duplication and use common
interface.

While at it, make ioctl error check stricter as liveupdate APIs don't
return postive numbers as a valid result.

Co-developed-by: David Matlack 
Signed-off-by: David Matlack 
Reviewed-by: Pasha Tatashin 
Reviewed-by: Pratyush Yadav (Google) 
Signed-off-by: Vipin Sharma 
Link: https://patch.msgid.link/20260720203202.1964557-2-vipinsh@google.com
Signed-off-by: Mike Rapoport (Microsoft)

selftests/liveupdate: add end to end test infrastructure and scripts

2026-07-10T08:07:54+00:00

Add the end to end testing infrastructure required to verify the
liveupdate feature. This includes a custom init process, a test
orchestration script, and a batch runner.

The framework consists of:

init.c:
A lightweight init process that manages the kexec lifecycle.
It mounts necessary filesystems, determines the current execution
stage (1 or 2) via the kernel command line, and handles the
kexec_file_load() sequence to transition between kernels.

vmtest.sh:
The primary KTAP-compliant test driver. It handles:
- Kernel configuration merging and building.
- Cross-compilation detection for x86_64 and arm64.
- Generation of the initrd containing the test binary and init.
- QEMU execution with automatic accelerator detection (KVM, HVF,
 or TCG).

run-vmtests.sh:
A wrapper that runs vmtest.sh for each LUO test across supported
architectures, providing a summary of pass/fail/skip results.

Signed-off-by: Pasha Tatashin 
Co-developed-by: Jordan Richards 
Signed-off-by: Jordan Richards 
Co-developed-by: Mike Rapoport (Microsoft) 
Acked-by: Pratyush Yadav 
Link: https://patch.msgid.link/20260626-luo-vmtest-v0-v4-1-e7d3111cd5b3@kernel.org
Signed-off-by: Mike Rapoport (Microsoft)

selftests/liveupdate: Add stress-files kexec test

2026-06-03T18:15:46+00:00

Add a new luo_stress_files kexec test that verifies preserving and
retrieving 500 files across a kexec reboot.

Reviewed-by: Pratyush Yadav (Google) 
Acked-by: Mike Rapoport (Microsoft) 
Signed-off-by: Pasha Tatashin 
Link: https://patch.msgid.link/20260603154402.468928-14-pasha.tatashin@soleen.com
Signed-off-by: Mike Rapoport (Microsoft)

selftests/liveupdate: Add stress-sessions kexec test

2026-06-03T18:15:46+00:00

Add a new test that creates 2000 LUO sessions before a kexec
reboot and verifies their presence after the reboot. This ensures
that the linked-block serialization mechanism works correctly for
a large number of sessions.

Acked-by: Mike Rapoport (Microsoft) 
Reviewed-by: Pratyush Yadav (Google) 
Signed-off-by: Pasha Tatashin 
Link: https://patch.msgid.link/20260603154402.468928-13-pasha.tatashin@soleen.com
Signed-off-by: Mike Rapoport (Microsoft)

selftests/liveupdate: Test session and file limit removal

2026-06-03T18:15:46+00:00

With the removal of static limits on the number of sessions and files per
session, the orchestrator now uses dynamic allocation.

Add new test cases to verify that the system can handle a large number of
sessions and files. These tests ensure that the dynamic block allocation
and reuse logic for session metadata and outgoing files work correctly
beyond the previous static limits.

Acked-by: Mike Rapoport (Microsoft) 
Reviewed-by: Pratyush Yadav (Google) 
Signed-off-by: Pasha Tatashin 
Link: https://patch.msgid.link/20260603154402.468928-12-pasha.tatashin@soleen.com
Signed-off-by: Mike Rapoport (Microsoft)

selftests/liveupdate: add test cases for LIVEUPDATE_SESSION_GET_NAME

2026-05-31T23:31:38+00:00

Verify that the new LIVEUPDATE_SESSION_GET_NAME ioctl works
as expected via new test cases in the existing liveupdate selftest.

Signed-off-by: Luca Boccassi 
Reviewed-by: Pasha Tatashin 
Reviewed-by: Pratyush Yadav 
Link: https://lore.kernel.org/r/20260429212221.814107-5-luca.boccassi@gmail.com
Signed-off-by: Pasha Tatashin 
Signed-off-by: Mike Rapoport (Microsoft)

selftests/liveupdate: add test cases for LIVEUPDATE_IOCTL_CREATE_SESSION calls with invalid length

2026-05-31T23:31:37+00:00

Verify that LIVEUPDATE_IOCTL_CREATE_SESSION ioctl which provide a name
that is an empty string or too long are not allowed.

Cc: stable@vger.kernel.org

Signed-off-by: Luca Boccassi 
Reviewed-by: Pasha Tatashin 
Reviewed-by: Pratyush Yadav 
Link: https://lore.kernel.org/r/20260429212221.814107-3-luca.boccassi@gmail.com
Signed-off-by: Pasha Tatashin 
Signed-off-by: Mike Rapoport (Microsoft)

selftests: liveupdate: add test for double preservation

2026-04-18T07:10:49+00:00

Verify that a file can only be preserved once across all active sessions. 
Attempting to preserve it a second time, whether in the same or a
different session, should fail with EBUSY.

Link: https://lore.kernel.org/20260326163943.574070-4-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin 
Reviewed-by: Mike Rapoport (Microsoft) 
Reviewed-by: Samiullah Khawaja 
Cc: David Matlack 
Cc: Pratyush Yadav 
Cc: Shuah Khan 
Cc: Christian Brauner  
Signed-off-by: Andrew Morton

selftests/liveupdate: add kexec test for multiple and empty sessions

2025-11-27T22:24:42+00:00

Introduce a new kexec-based selftest, luo_kexec_multi_session, to validate
the end-to-end lifecycle of a more complex LUO scenario.

While the existing luo_kexec_simple test covers the basic end-to-end
lifecycle, it is limited to a single session with one preserved file. 
This new test significantly expands coverage by verifying LUO's ability to
handle a mixed workload involving multiple sessions, some of which are
intentionally empty.  This ensures that the LUO core correctly preserves
and restores the state of all session types across a reboot.

The test validates the following sequence:

Stage 1 (Pre-kexec):

  - Creates two empty test sessions (multi-test-empty-1,
    multi-test-empty-2).
  - Creates a session with one preserved memfd (multi-test-files-1).
  - Creates another session with two preserved memfds
    (multi-test-files-2), each containing unique data.
  - Creates a state-tracking session to manage the transition to
    Stage 2.
  - Executes a kexec reboot via the helper script.

Stage 2 (Post-kexec):

  - Retrieves the state-tracking session to confirm it is in the
    post-reboot stage.
  - Retrieves all four test sessions (both the empty and non-empty
    ones).
  - For the non-empty sessions, restores the preserved memfds and
    verifies their contents match the original data patterns.
  - Finalizes all test sessions and the state session to ensure a clean
    teardown and that all associated kernel resources are correctly
    released.

This test provides greater confidence in the robustness of the LUO
framework by validating its behavior in a more realistic, multi-faceted
scenario.

Link: https://lkml.kernel.org/r/20251125165850.3389713-19-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin 
Reviewed-by: Mike Rapoport (Microsoft) 
Tested-by: David Matlack 
Cc: Aleksander Lobakin 
Cc: Alexander Graf 
Cc: Alice Ryhl 
Cc: Andriy Shevchenko 
Cc: anish kumar 
Cc: Anna Schumaker 
Cc: Bartosz Golaszewski 
Cc: Bjorn Helgaas 
Cc: Borislav Betkov 
Cc: Chanwoo Choi 
Cc: Chen Ridong 
Cc: Chris Li 
Cc: Christian Brauner 
Cc: Daniel Wagner 
Cc: Danilo Krummrich 
Cc: Dan Williams 
Cc: David Hildenbrand 
Cc: David Jeffery 
Cc: David Rientjes 
Cc: Greg Kroah-Hartman 
Cc: Guixin Liu 
Cc: "H. Peter Anvin" 
Cc: Hugh Dickins 
Cc: Ilpo Järvinen 
Cc: Ingo Molnar 
Cc: Ira Weiny 
Cc: Jann Horn 
Cc: Jason Gunthorpe 
Cc: Jens Axboe 
Cc: Joanthan Cameron 
Cc: Joel Granados 
Cc: Johannes Weiner 
Cc: Jonathan Corbet 
Cc: Lennart Poettering 
Cc: Leon Romanovsky 
Cc: Leon Romanovsky 
Cc: Lukas Wunner 
Cc: Marc Rutland 
Cc: Masahiro Yamada 
Cc: Matthew Maurer 
Cc: Miguel Ojeda 
Cc: Myugnjoo Ham 
Cc: Parav Pandit 
Cc: Pratyush Yadav 
Cc: Pratyush Yadav 
Cc: Randy Dunlap 
Cc: Roman Gushchin 
Cc: Saeed Mahameed 
Cc: Samiullah Khawaja 
Cc: Song Liu 
Cc: Steven Rostedt 
Cc: Stuart Hayes 
Cc: Tejun Heo 
Cc: Thomas Gleinxer 
Cc: Thomas Weißschuh 
Cc: Vincent Guittot 
Cc: William Tu 
Cc: Yoann Congal 
Cc: Zhu Yanjun 
Cc: Zijun Hu 
Signed-off-by: Andrew Morton