linux-kernel - Re: [Fastboot] [PATCH][RFC] x86_64: Reload CS when startup

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Message-Id: <20060821221009.a43cfbf0.ak@suse.de>
Date:	Mon, 21 Aug 2006 22:10:09 +0200
From:	Andi Kleen <ak@...e.de>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	vgoyal@...ibm.com, Magnus Damm <magnus.damm@...il.com>,
	Magnus Damm <magnus@...inux.co.jp>, fastboot@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Fastboot] [PATCH][RFC] x86_64: Reload CS when startup_64 is
 used.


> I'm not certain I caught everything but as far as I know I did.
> Part of that was by having the code run at a fixed virtual address so
> we still live in the last 2GB of the virtual address space.

You changed the -2GB (or rather -40MB unpatched) mapping to not necessarily 
be linear? There are a couple of assumptions that it is, including at boot up
(it doubles as the 1:1 mapping then) and in change_page_attr() and in suspend/resume.

-Andi
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