[PATCH v9 3/6] kho: persist blob size in KHO FDT

[Pratyush Yadav]

On Mon, Mar 16 2026, Breno Leitao wrote:

> kho_add_subtree() accepts a size parameter but only forwards it to
> debugfs. The size is not persisted in the KHO FDT, so it is lost across
> kexec. This makes it impossible for the incoming kernel to determine the
> blob size without understanding the blob format.
>
> Store the blob size as a "blob-size" property in the KHO FDT alongside
> the "preserved-data" physical address. This allows the receiving kernel
> to recover the size for any blob regardless of format.
>
> Also extend kho_retrieve_subtree() with an optional size output
> parameter so callers can learn the blob size without needing to
> understand the blob format. Update all callers to pass NULL for the
> new parameter.
>
> Reviewed-by: Mike Rapoport (Microsoft) <rppt at kernel.org>
> Signed-off-by: Breno Leitao <leitao at debian.org>

Reviewed-by: Pratyush Yadav <pratyush at kernel.org>

[...]

-- 
Regards,
Pratyush Yadav