From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] paravirt.h
Date: Tue, 22 Aug 2006 19:35:03 +0100
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To: Zachary Amsden <zach@vmware.com>
Cc: Andrew Morton <akpm@osdl.org>, Andi Kleen <ak@muc.de>, Chris Wright <chrisw@sous-sol.org>, virtualization@lists.osdl.org, Arjan van de Ven <arjan@infradead.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Adrian Bunk <bunk@stusta.de>
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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