linux-kernel - Re: [PATCH v7 02/22] liveupdate: luo

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Message-ID: <mafs0ikezzf30.fsf@kernel.org>
Date: Mon, 24 Nov 2025 15:21:23 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [PATCH v7 02/22] liveupdate: luo_core: integrate with KHO

On Sat, Nov 22 2025, Pasha Tatashin wrote:

> Integrate the LUO with the KHO framework to enable passing LUO state
> across a kexec reboot.
>
> This patch implements the lifecycle integration with KHO:
>
> 1. Incoming State: During early boot (`early_initcall`), LUO checks if
>    KHO is active. If so, it retrieves the "LUO" subtree, verifies the
>    "luo-v1" compatibility string, and reads the `liveupdate-number` to
>    track the update count.
>
> 2. Outgoing State: During late initialization (`late_initcall`), LUO
>    allocates a new FDT for the next kernel, populates it with the basic
>    header (compatible string and incremented update number), and
>    registers it with KHO (`kho_add_subtree`).
>
> 3. Finalization: The `liveupdate_reboot()` notifier is updated to invoke
>    `kho_finalize()`. This ensures that all memory segments marked for
>    preservation are properly serialized before the kexec jump.
>
> LUO now depends on `CONFIG_KEXEC_HANDOVER`.

Nit: This patch does not add the dependency. That is done by patch 1. I
guess that change needs to be moved here or the comment removed?

Other than this,

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

[...]

-- 
Regards,
Pratyush Yadav