Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932307Ab0FBJuv (ORCPT ); Wed, 2 Jun 2010 05:50:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41916 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757675Ab0FBJus (ORCPT ); Wed, 2 Jun 2010 05:50:48 -0400 Message-ID: <4C062957.5030801@redhat.com> Date: Wed, 02 Jun 2010 12:50:15 +0300 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-3.fc13 Thunderbird/3.0.4 MIME-Version: 1.0 To: Joerg Roedel CC: "Michael S. Tsirkin" , Tom Lyon , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, chrisw@sous-sol.org, hjk@linutronix.de, gregkh@suse.de, aafabbri@cisco.com, scofeldm@cisco.com Subject: Re: [PATCH] VFIO driver: Non-privileged user level PCI drivers References: <4C025999.7080706@redhat.com> <20100530124949.GI27611@redhat.com> <4C0261C1.9090204@redhat.com> <20100530130332.GM27611@redhat.com> <4C026497.8070901@redhat.com> <20100530145309.GO27611@redhat.com> <4C03A285.7060902@redhat.com> <20100531171007.GA6516@redhat.com> <4C04C085.1030107@redhat.com> <20100601095532.GA9178@redhat.com> <20100602094201.GC964@8bytes.org> In-Reply-To: <20100602094201.GC964@8bytes.org> 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 Content-Length: 1124 Lines: 28 On 06/02/2010 12:42 PM, Joerg Roedel wrote: > On Tue, Jun 01, 2010 at 12:55:32PM +0300, Michael S. Tsirkin wrote: > > >> There seems to be some misunderstanding. The userspace interface >> proposed forces a separate domain per device and forces userspace to >> repeat iommu programming for each device. We are better off sharing a >> domain between devices and programming the iommu once. >> >> The natural way to do this is to have an iommu driver for programming >> iommu. >> > IMO a seperate iommu-userspace driver is a nightmare for a userspace > interface. It is just too complicated to use. We can solve the problem > of multiple devices-per-domain with an ioctl which allows binding one > uio-device to the address-space on another. Thats much simpler. > This is non trivial with hotplug. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/