From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758067AbZHRKAw (ORCPT ); Tue, 18 Aug 2009 06:00:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753792AbZHRKAv (ORCPT ); Tue, 18 Aug 2009 06:00:51 -0400 Received: from mx2.redhat.com ([66.187.237.31]:41462 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751994AbZHRKAu (ORCPT ); Tue, 18 Aug 2009 06:00:50 -0400 Message-ID: <4A8A7BB9.2020906@redhat.com> Date: Tue, 18 Aug 2009 13:00:25 +0300 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3 MIME-Version: 1.0 To: "Michael S. Tsirkin" CC: Gregory Haskins , Ingo Molnar , Gregory Haskins , kvm@vger.kernel.org, alacrityvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus_driver objects References: <20090814154125.26116.70709.stgit@dev.haskins.net> <20090814154308.26116.46980.stgit@dev.haskins.net> <20090815103243.GA26749@elte.hu> <4A8954F0.3040402@gmail.com> <20090817142506.GB3602@elte.hu> <4A8971A8.2040102@gmail.com> <20090817150844.GA3307@elte.hu> <4A89B08A.4010103@gmail.com> <20090818095313.GC13878@redhat.com> In-Reply-To: <20090818095313.GC13878@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/18/2009 12:53 PM, Michael S. Tsirkin wrote: > I'm not hung up on PCI, myself. An idea that might help you get Avi > on-board: do setup in userspace, over PCI. Negotiate hypercall support > (e.g. with a PCI capability) and then switch to that for fastpath. Hmm? > Hypercalls don't nest well. When a nested guest issues a hypercall, you have to assume it is destined to the enclosing guest, so you can't assign a hypercall-capable device to a nested guest. mmio and pio don't have this problem since the host can use the address to locate the destination. -- error compiling committee.c: too many arguments to function