linux-kernel - Re: [PATCH] paravirt.h

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Date:	Tue, 22 Aug 2006 19:35:03 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Zachary Amsden <zach@...are.com>
Cc:	Andi Kleen <ak@....de>, virtualization@...ts.osdl.org,
	Adrian Bunk <bunk@...sta.de>, Andrew Morton <akpm@...l.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] paravirt.h

Ar Maw, 2006-08-22 am 10:36 -0700, ysgrifennodd Zachary Amsden:
> Write protection is great as a debug option to find accidental memory 
> corruptions.  It is useless as a technique to prevent subversion.  Um 
> hello, you're already at CPL-0.  Just rewrite the page tables already.

That depends upon how clever you are.  However if you want to load a
hypervisor under a running kernel and from it then you need an updatable
paravirt_ops.

Alan
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