linux-kernel - Re: A set of "standard" virtual devices?

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Message-ID: <4611768D.1080801@garzik.org>
Date:	Mon, 02 Apr 2007 17:33:01 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andi Kleen <ak@...e.de>
CC:	virtualization@...ts.linux-foundation.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mathiasen@...il.com
Subject: Re: A set of "standard" virtual devices?

Andi Kleen wrote:
>> How would that work in the case where virtualized guests don't have a
>> visible PCI bus, and the virtual environment doesn't pretend to emulate
>> a PCI bus?
> 
> If they emulated one with the appropiate device 
> then distribution driver auto probing would just work transparently for them.

Yes, but, ideally with paravirtualization you should be able to avoid 
the overhead of emulating many major classes of device (storage, 
network, RNG, etc.) by developing a low-overhead passthrough interface 
that does not involve PCI at all.

	Jeff


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