linux-kernel - Re: [patch] paravirt: VDSO page is essential

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Message-ID: <45ED310D.1000407@goop.org>
Date:	Tue, 06 Mar 2007 01:14:53 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Roland McGrath <roland@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: [patch] paravirt: VDSO page is essential

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
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