linux-kernel - Re: [REGRESSION] Kernel booted via kexec fails to resume from hibernation

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Message-ID: <Z-8E-LLs1dFWfn6J@desktop0a>
Date: Fri, 4 Apr 2025 00:00:24 +0200
From: Roberto Ricci <io@...icci.it>
To: msizanoen <msizanoen@...labs.xyz>
Cc: ebiederm@...ssion.com, rafael@...nel.org, pavel@....cz,
	ytcoode@...il.com, kexec@...ts.infradead.org,
	linux-pm@...r.kernel.org, akpm@...ux-foundation.org,
	regressions@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] Kernel booted via kexec fails to resume from
 hibernation

On 2025-04-01 19:59 +0700, msizanoen wrote:
> [snip]
> It seems like `e820__register_nosave_regions` is erroneously marking some
> kernel memory as nosave in the presence of sub-page e820 regions. In theory
> backporting
> https://lore.kernel.org/all/20250214090651.3331663-1-rppt@kernel.org/ should
> be sufficient to avoid this but a fix for the actual root cause is
> preferred.

When using kexec_file_load, this patch series fixes the issue not only
in theory but also in practice.
But the issue with kexec_load (see
https://lore.kernel.org/all/Z-hYWc9LtBU1Yhtg@desktop0a/
), which might be related, is not fixed.