From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965997AbXDBWaz (ORCPT ); Mon, 2 Apr 2007 18:30:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S966001AbXDBWaz (ORCPT ); Mon, 2 Apr 2007 18:30:55 -0400 Received: from terminus.zytor.com ([192.83.249.54]:52026 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965997AbXDBWay (ORCPT ); Mon, 2 Apr 2007 18:30:54 -0400 Message-ID: <46118410.2060904@zytor.com> Date: Mon, 02 Apr 2007 15:30:40 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 1.5.0.9 (X11/20070212) MIME-Version: 1.0 To: Jeff Garzik CC: Jeremy Fitzhardinge , Andi Kleen , virtualization@lists.linux-foundation.org, Virtualization Mailing List , Linux Kernel Mailing List , mathiasen@gmail.com Subject: Re: A set of "standard" virtual devices? References: <4611652F.700@zytor.com> <200704022312.39195.ak@suse.de> <4611768D.1080801@garzik.org> <200704022336.43136.ak@suse.de> <461178D9.402@goop.org> <46117F72.6020506@zytor.com> <461182BE.5040902@garzik.org> In-Reply-To: <461182BE.5040902@garzik.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jeff Garzik wrote: > > Sure, but let's look beyond device detection. For instance, it does not > necessarily follow that emulating PCI DMA is the best way to go for > communication with a virtual device, once detected. > This is true, of course. However, there are going to be a set of virtual devices which don't necessarily have to have super-high performance. In the case of a hwrng device, even doing DMA is probably overkill. > Outside of pci_device_id driver matching, is there much value here? If we can get a set of device drivers that if not all then at least a number of hypervisors and/or emulators can agree upon, I think that's much won. -hpa