From: Pratyush Yadav <pratyush@kernel.org>
To: Breno Leitao <leitao@debian.org>
Cc: Alexander Graf <graf@amazon.com>,
Mike Rapoport <rppt@kernel.org>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Pratyush Yadav <pratyush@kernel.org>,
linux-kernel@vger.kernel.org, kexec@lists.infradead.org,
linux-mm@kvack.org, usama.arif@linux.dev,
SeongJae Park <sj@kernel.org>,
kernel-team@meta.com
Subject: Re: [PATCH v9 3/6] kho: persist blob size in KHO FDT
Date: Fri, 03 Apr 2026 11:24:42 +0000 [thread overview]
Message-ID: <2vxztstscmmd.fsf@kernel.org> (raw)
In-Reply-To: <20260316-kho-v9-3-ed6dcd951988@debian.org> (Breno Leitao's message of "Mon, 16 Mar 2026 04:54:33 -0700")
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@kernel.org>
> Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
[...]
--
Regards,
Pratyush Yadav
next prev parent reply other threads:[~2026-04-03 11:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-16 11:54 [PATCH v9 0/6] kho: history: track previous kernel version and kexec boot count Breno Leitao
2026-03-16 11:54 ` [PATCH v9 1/6] kho: add size parameter to kho_add_subtree() Breno Leitao
2026-04-03 11:21 ` Pratyush Yadav
2026-03-16 11:54 ` [PATCH v9 2/6] kho: rename fdt parameter to blob in kho_add/remove_subtree() Breno Leitao
2026-03-16 11:54 ` [PATCH v9 3/6] kho: persist blob size in KHO FDT Breno Leitao
2026-04-03 11:24 ` Pratyush Yadav [this message]
2026-03-16 11:54 ` [PATCH v9 4/6] kho: fix kho_in_debugfs_init() to handle non-FDT blobs Breno Leitao
2026-04-03 11:27 ` Pratyush Yadav
2026-03-16 11:54 ` [PATCH v9 5/6] kho: kexec-metadata: track previous kernel chain Breno Leitao
2026-04-03 11:29 ` Pratyush Yadav
2026-03-16 11:54 ` [PATCH v9 6/6] kho: document kexec-metadata tracking feature Breno Leitao
2026-04-03 11:33 ` [PATCH v9 0/6] kho: history: track previous kernel version and kexec boot count Pratyush Yadav
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