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From: Michael Kelley <mikelley@microsoft.com>
To: James Morris <jmorris@namei.org>, Sasha Levin <sashal@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Borislav Petkov <bp@alien8.de>
Cc: x86-ml <x86@kernel.org>, lkml <linux-kernel@vger.kernel.org>,
	James Morris <James.Morris@microsoft.com>
Subject: RE: [GIT PULL] x86/urgent for v5.13-rc5
Date: Tue, 8 Jun 2021 17:53:15 +0000	[thread overview]
Message-ID: <MWHPR21MB159330952629D36EEDE706B3D7379@MWHPR21MB1593.namprd21.prod.outlook.com> (raw)
In-Reply-To: <eaf8e14-12d6-6e3a-f5e5-8b504647eb48@namei.org>

From: James Morris <jmorris@namei.org> Sent: Monday, June 7, 2021 11:47 AM
> 
> On Sun, 6 Jun 2021, Sasha Levin wrote:
> 
> > >
> > >Let's see if Sasha can dig out something... CCed.
> > >
> > >@Sasha, can you figure out who we can talk to whether Windoze reserves
> > >the first megabyte of memory unconditionally?
> >
> > That's a great question, but I can't help there anymore :)
> >
> > Adding James Morris...
> 
> Adding Michael Kelley.
> 

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.

Michael

  reply	other threads:[~2021-06-08 17:53 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-06  7:55 [GIT PULL] x86/urgent for v5.13-rc5 Borislav Petkov
2021-06-06 19:38 ` Linus Torvalds
2021-06-06 20:58   ` Mike Rapoport
2021-06-06 21:23     ` Linus Torvalds
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 [this message]
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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