linux-kernel - Re: [tboot-devel] [PATCH 1/1] Disable CET when calling tboot shutdown procedure.

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Message-ID: <aST5ruhnbILZnoUO@archie.me>
Date: Tue, 25 Nov 2025 07:34:54 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Tony Camuso <tcamuso@...hat.com>, ning.sun@...el.com,
	tboot-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, rppt@...nel.org, tglx@...utronix.de,
	mingo@...nel.org, bp@...en8.de,
	michal.camacho.romero@...ux.intel.com
Subject: Re: [tboot-devel] [PATCH 1/1] Disable CET when calling tboot
 shutdown procedure.

On Thu, Nov 13, 2025 at 09:37:14AM -0500, Tony Camuso wrote:
> The tboot->shutdown_entry is effectively bios code and CET needs to be
> disabled before calling it.
> 
> It resolves TBOOT shutdown failure bug, reported on the SLES (SUSE Linux
> Enterprise Server) 16.0 OS. OS power off, called by the "init 0" command,
> was failing, due to activated Intel Control-Flow Enforcement Technology
> (CET).
> Disabling CET has allowed to execute OS and TBOOT shutdown properly.

Are ``systemctl poweroff`` and ``shutdown -P`` are also affected?

Confused...

-- 
An old man doll... just what I always wanted! - Clara

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