linux-kernel - Re: [PATCH v7 16/22] selftests/liveupdate: Add userspace API selftests

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Message-ID: <mafs0ecpnxw3p.fsf@kernel.org>
Date: Mon, 24 Nov 2025 16:56:42 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [PATCH v7 16/22] selftests/liveupdate: Add userspace API selftests

On Sat, Nov 22 2025, Pasha Tatashin wrote:

> Introduce a selftest suite for LUO. These tests validate the core
> userspace-facing API provided by the /dev/liveupdate device and its
> associated ioctls.
>
> The suite covers fundamental device behavior, session management, and
> the file preservation mechanism using memfd as a test case. This
> provides regression testing for the LUO uAPI.
>
> The following functionality is verified:
>
> Device Access:
>     Basic open and close operations on /dev/liveupdate.
>     Enforcement of exclusive device access (verifying EBUSY on a
>     second open).
>
> Session Management:
>     Successful creation of sessions with unique names.
>     Failure to create sessions with duplicate names.
>
> File Preservation:
>     Preserving a single memfd and verifying its content remains
>     intact post-preservation.
>     Preserving multiple memfds within a single session, each with
>     unique data.
>     A complex scenario involving multiple sessions, each containing
>     a mix of empty and data-filled memfds.
>
> Note: This test suite is limited to verifying the pre-kexec
> functionality of LUO (e.g., session creation, file preservation).
> The post-kexec restoration of resources is not covered, as the kselftest
> framework does not currently support orchestrating a reboot and
> continuing execution in the new kernel.
>
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>

Reviewed-by: Pratyush Yadav <pratyush@...nel.org>

[...]

-- 
Regards,
Pratyush Yadav