linux-kernel - Re: [PATCH] Add I/O hypercalls for i386 paravirt

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Date:	Wed, 22 Aug 2007 13:23:52 +0200
From:	Andi Kleen <ak@...e.de>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Andi Kleen <ak@...e.de>, Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt

On Wed, Aug 22, 2007 at 01:23:43PM +0300, Avi Kivity wrote:
> Andi Kleen wrote:
> >>I don't see why it's intrusive -- they all use the APIs, right?
> >>    
> >
> >Yes, but it still changes them. It might have a larger impact
> >on code size for example. 
> >  
> 
> Only if CONFIG_PARAVIRT is defined.  

Which eventually distribution kernels will do.

> And even then, all the performance 
> sensitive stuff uses mmio, no?

Not worried about performance, but just impact on code size etc.

-Andi
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