linux-kernel - Re: [PATCH 5.10 011/100] efi: runtime: avoid EFIv2 runtime services on Apple x86 machines

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Message-ID: <20220203205933.GA27367@srcf.ucam.org>
Date:   Thu, 3 Feb 2022 20:59:33 +0000
From:   Matthew Garrett <mjg59@...f.ucam.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jeremy Kerr <jk@...abs.org>,
        Aditya Garg <gargaditya08@...e.com>,
        Orlando Chamberlain <redecorating@...tonmail.com>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH 5.10 011/100] efi: runtime: avoid EFIv2 runtime services
 on Apple x86 machines

On Thu, Feb 03, 2022 at 09:52:23PM +0100, Pavel Machek wrote:

> This problem is not 64-bit specific, right? Should it depend on
> CONFIG_X86, instead?

Only 64-bit systems are affected (the one 32-bit generation of Apple 
hardware implementing EFI only claims 1.10 support), and 32-bit kernels 
can't make 64-bit UEFI runtime calls, so I think it's correct to make it 
64-bit only.