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Date: Tue, 06 Mar 2007 01:14:53 -0800
From: Jeremy Fitzhardinge <jeremy@goop.org>
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To: Roland McGrath <roland@redhat.com>
CC: Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@suse.de>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       Rusty Russell <rusty@rustcorp.com.au>,
       Jan Beulich <jbeulich@novell.com>
Subject: Re: [patch] paravirt: VDSO page is essential
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Roland McGrath wrote:
> For everything else to work, it needs to be set by changing __FIXADDR_TOP,
> which seems to be done by calling reserve_top_address early enough.
> It looks like that needs to be properly tied into paravirt_ops somehow.
>   

The startup code for whatever hypervisor you're running makes a call to
reserve_top to reserve the appropriate amount of address space.  This
happens very early.

    J