linux-kernel - Re: x86_64 32-bit EFI mixed mode boot broken

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Message-ID: <749b1cea4fd9e8d8debadc51cf3c0374d9878ae9@craftyguy.net>
Date: Sun, 24 Mar 2024 20:45:59 +0000
From: "Clayton Craft" <clayton@...ftyguy.net>
To: "Ard Biesheuvel" <ardb@...nel.org>, "Hans de Goede" <hdegoede@...hat.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
 "Thomas Gleixner" <tglx@...utronix.de>, "Ingo Molnar" <mingo@...hat.com>,
 "Borislav Petkov" <bp@...en8.de>, "Dave Hansen"
 <dave.hansen@...ux.intel.com>, regressions@...ts.linux.dev
Subject: Re: x86_64 32-bit EFI mixed mode boot broken

March 24, 2024 at 10:43 AM, "Ard Biesheuvel" <ardb@...nel.org> wrote:


> Thanks.
> 
> I pushed another branch
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/log/?h=efi-clayton-3
> 
> which has a proper fix for the issue that you found.
> 
> As it turns out, the compat mixed mode (with handover protocol) was
> 
> broken from the beginning, and the change you identified just happened
> 
> to trigger it on your hardware.


Tested and fixes booting on my Bay Trail tablet and NUC. Thanks for fixing this!

Tested-by: Clayton Craft <clayton@...ftyguy.net>

-Clayton