linux-kernel - Re: [GIT PULL] x86/urgent for v5.13-rc5

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Message-ID: <YL+368+oKRORwUzx@zn.tnic>
Date:   Tue, 8 Jun 2021 20:33:15 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Michael Kelley <mikelley@...rosoft.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     James Morris <jmorris@...ei.org>, Sasha Levin <sashal@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>, x86-ml <x86@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        James Morris <James.Morris@...rosoft.com>
Subject: Re: [GIT PULL] x86/urgent for v5.13-rc5

On Tue, Jun 08, 2021 at 05:53:15PM +0000, Michael Kelley wrote:
> I checked with the Windows team.  Peter Anvin's statement from 11
> years ago is true.  On Intel and AMD processors, Windows unconditionally
> reserves the 1st megabyte of memory, minus one page used for real
> mode startup.   This is done to work around BIOS bugs.

Thanks for checking!

I guess us doing the same is probably fine.

Linus, maybe we should at least give it a try and see whether someone
complains and revert, potentially...?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette