From: Breno Leitao <leitao@debian.org>
To: Chris Down <chris@chrisdown.name>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>,
Mike Rapoport <rppt@kernel.org>,
Pratyush Yadav <pratyush@kernel.org>,
Alexander Graf <graf@amazon.com>,
Baoquan He <baoquan.he@linux.dev>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
kexec@lists.infradead.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, kernel-team@meta.com
Subject: Re: [PATCH 1/9] kho: Reclaim the metadata page left reserved after kexec
Date: Wed, 11 Nov 2026 03:08:48 -0800 [thread overview]
Message-ID: <avRMoA8Hy3P6k72d@gmail.com> (raw)
In-Reply-To: <63ca64c004b296a998a3e531f8c0c4964916b70c.1794383544.git.chris@chrisdown.name>
On Tue, Nov 10, 2026 at 11:52:55PM -0800, Chris Down wrote:
> After a KHO kexec, the new kernel keeps the page holding the previous
> kernel's kexec metadata reserved for as long as it runs. It only needs
> the page once, since kho_in_kexec_metadata() copies the previous release
> and the kexec count out of it at boot, and nothing reads it again.
Good catch.
>
> Free it with kho_restore_free() once copying is complete.
>
> Fixes: 76aa46b9e404 ("kho: kexec-metadata: track previous kernel chain")
> Signed-off-by: Chris Down <chris@chrisdown.name>
Tested-by: Breno Leitao <leitao@debian.org>
next prev parent reply other threads:[~2026-11-11 11:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 7:52 [PATCH 0/9] kho, liveupdate: KHO/LUO observability Chris Down
2026-11-11 7:52 ` [PATCH 1/9] kho: Reclaim the metadata page left reserved after kexec Chris Down
2026-11-11 11:08 ` Breno Leitao [this message]
2026-11-11 22:29 ` Pasha Tatashin
2026-11-11 7:53 ` [PATCH 2/9] kho: Make bootmem reservations visible to fleet monitoring Chris Down
2026-11-11 7:53 ` [PATCH 3/9] liveupdate: Make failed retrieves distinguishable from dropped files Chris Down
2026-11-11 7:53 ` [PATCH 4/9] selftests/liveupdate: Catch incorrect file accounting across kexec Chris Down
2026-11-11 7:53 ` [PATCH 5/9] selftests/kho: Catch missing or zero bootmem reports before kexec Chris Down
2026-11-11 7:53 ` [PATCH 6/9] kho: Expose rejected handovers that look like cold boots Chris Down
2026-11-11 7:53 ` [PATCH 7/9] kho: Report how much handover memory is preserved and restored Chris Down
2026-11-11 7:53 ` [PATCH 8/9] liveupdate: Expose the sequence number for consecutive live updates Chris Down
2026-11-11 7:53 ` [PATCH 9/9] selftests/liveupdate: Check handover revival, sequence and memory stats Chris Down
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