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

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Message-ID: <CAMj1kXGyKdoLZ9t9_X4diiy9GsqxJ_NkHsm_t+cAJBxhHW7mAA@mail.gmail.com>
Date: Sun, 24 Mar 2024 22:53:47 +0200
From: Ard Biesheuvel <ardb@...nel.org>
To: Clayton Craft <clayton@...ftyguy.net>
Cc: Hans de Goede <hdegoede@...hat.com>, 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

On Sun, 24 Mar 2024 at 22:46, Clayton Craft <clayton@...ftyguy.net> wrote:
>
> 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>
>

Thanks!