linux-kernel - Re: [PATCH v7 18/22] selftests/liveupdate: Add kexec test for multiple and empty sessions

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Message-ID: <aSPtiYSV9vkYvlBD@kernel.org>
Date: Mon, 24 Nov 2025 07:30:49 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [PATCH v7 18/22] selftests/liveupdate: Add kexec test for
 multiple and empty sessions

On Sat, Nov 22, 2025 at 05:23:45PM -0500, Pasha Tatashin wrote:
> 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.
> 
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>

Reviewed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

> ---
>  tools/testing/selftests/liveupdate/Makefile   |   1 +
>  .../selftests/liveupdate/luo_multi_session.c  | 162 ++++++++++++++++++
>  2 files changed, 163 insertions(+)
>  create mode 100644 tools/testing/selftests/liveupdate/luo_multi_session.c

-- 
Sincerely yours,
Mike.