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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Mike Rapoport <rppt@linux.ibm.com>
Cc: Borislav Petkov <bp@suse.de>, x86-ml <x86@kernel.org>,
	lkml <linux-kernel@vger.kernel.org>
Subject: Re: [GIT PULL] x86/urgent for v5.13-rc5
Date: Sun, 6 Jun 2021 14:23:21 -0700	[thread overview]
Message-ID: <CAHk-=wg7+-Q-jvrwQmyZtQ3pirAUcAQmvUpiLu=0nJv8NObntg@mail.gmail.com> (raw)
In-Reply-To: <YL029aQZb09G3ShY@linux.ibm.com>

On Sun, Jun 6, 2021 at 1:58 PM Mike Rapoport <rppt@linux.ibm.com> wrote:
>
> A while ago hpa said:
>
>         As far as I know, Windows 7 actually reserves all memory below
>         1 MiB to avoid BIOS bugs.
>
> (https://bugzilla.kernel.org/show_bug.cgi?id=16661#c2)

It would be good to have that checked somehow.

I don't think this matters on any machine with gigs of RAM, but I do
wonder about the people who want to do small configurations. Maybe
they've given up on x86?

It also eats into that somewhat precious legacy DMA resource and eats
up a fair chunk of that. Again, not an issue on modern hardware, but
..

> I believe that reserving everything below 1M after the real mode trampoline
> is allocated reduces amount of hidden dependencies and makes things simpler
> overall.

Simpler, perhaps, and _I_ personally don't care about about 512kB of
memory any more on any machines I have, but ..

          Linus

  reply	other threads:[~2021-06-06 21:23 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-06  7:55 Borislav Petkov
2021-06-06 19:38 ` Linus Torvalds
2021-06-06 20:58   ` Mike Rapoport
2021-06-06 21:23     ` Linus Torvalds [this message]
2021-06-06 22:07       ` Borislav Petkov
2021-06-06 23:05         ` Sasha Levin
2021-06-07 18:46           ` James Morris
2021-06-08 17:53             ` Michael Kelley
2021-06-08 18:33               ` Borislav Petkov
2021-06-08 19:22                 ` Linus Torvalds
2021-06-08 20:01                   ` Borislav Petkov
2021-06-08 20:03                     ` Linus Torvalds
2021-06-08 20:30                       ` [PATCH] x86/setup: Document that Windows reserves the first MiB Borislav Petkov
2021-06-09  8:54                         ` Mike Rapoport
2021-06-06 20:14 ` [GIT PULL] x86/urgent for v5.13-rc5 pr-tracker-bot

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