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

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Message-ID: <m17j11u7mx.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 21 Aug 2006 15:00:06 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andi Kleen <ak@...e.de>
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.

Andi Kleen <ak@...e.de> writes:

>> 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?

I left it linear but I removed assumptions about which physical address it
goes to.

>  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.

Yes.  Those all sound familiar.

I removed the doubling as the 1:1 physical mapping.

Eric
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