linux-kernel - Re: [PATCH v2 0/2] x86: Fix kexec 5-level to 4-level paging transition

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Message-ID: <20251031122938.GLaQSrsjuXOp6FA8p7@fat_crate.local>
Date: Fri, 31 Oct 2025 13:29:38 +0100
From: Borislav Petkov <bp@...en8.de>
To: Kiryl Shutsemau <kas@...nel.org>
Cc: Usama Arif <usamaarif642@...il.com>, dwmw@...zon.co.uk,
	tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
	ardb@...nel.org, hpa@...or.com, x86@...nel.org, apopple@...dia.com,
	thuth@...hat.com, nik.borisov@...e.com,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	kernel-team@...a.com, Michael van der Westhuizen <rmikey@...a.com>,
	Tobias Fleig <tfleig@...a.com>
Subject: Re: [PATCH v2 0/2] x86: Fix kexec 5-level to 4-level paging
 transition

On Thu, Oct 30, 2025 at 10:23:11AM +0000, Kiryl Shutsemau wrote:
> Older kernels in our fleet run with 5-level paging disabled. The newer
> one enables it. Machines need to switch between kernel version from time
> to time for different reasons. Switching from the newer kernel to an
> older one triggered the issue.

Thx, makes sense.

-- 
Regards/Gruss,
    Boris.

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