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

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Message-Id: <200608221654.10558.ak@muc.de>
Date:	Tue, 22 Aug 2006 16:54:10 +0200
From:	Andi Kleen <ak@....de>
To:	virtualization@...ts.osdl.org
Cc:	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>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] paravirt.h

On Tuesday 22 August 2006 16:25, Adrian Bunk wrote:
> On Tue, Aug 22, 2006 at 03:50:57PM +0200, Andi Kleen wrote:
> > 
> > > this would need a "const after boot" section; which is really not hard
> > > to make and probably useful for a lot more things.... todo++
> > 
> > except for anything that needs tlb entries in user space. And it only gives you
> > false sense of security. --todo
> 
> What's the alternative?

The alternative is to not protect it, since protecting it doesn't
offer any significant additional security over not protecting it.

> 
> Change it from a struct to a compile time choice?

One of the design goals of paravirt-ops was to allow single binaries
that run on both native hardware and on hypervisors. So that would
be a non starter.

-Andi

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