From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Hartmann Subject: Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu Date: Thu, 26 Jul 2012 23:23:42 +0200 Message-ID: <5011B55E.4040707@01019freenet.de> References: <20120725165948.17260.82862.stgit@bling.home> <50104973.3090302@redhat.com> <1343246026.2229.374.camel@bling.home> <50110163.30209@redhat.com> <1343314583.3125.17.camel@ul30vt> <50116954.1040001@redhat.com> <1343320398.3125.41.camel@ul30vt> <501172FF.4070708@redhat.com> <1343329880.3125.91.camel@ul30vt> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Avi Kivity , aik@ozlabs.ru, kvm@vger.kernel.org To: Alex Williamson Return-path: Received: from mout6.freenet.de ([195.4.92.96]:43465 "EHLO mout6.freenet.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752900Ab2GZVZ7 (ORCPT ); Thu, 26 Jul 2012 17:25:59 -0400 In-Reply-To: <1343329880.3125.91.camel@ul30vt> Sender: kvm-owner@vger.kernel.org List-ID: Alex Williamson wrote: [I removed qemu-devel because I'm not registered there] > On Thu, 2012-07-26 at 19:40 +0300, Avi Kivity wrote: >> On 07/26/2012 07:33 PM, Alex Williamson wrote: >>>> >>>> In the common case, on x86 (but I'm repeating myself), the iommu group >>>> includes just one device, yes? Could we make pci-stub an alias for the >>>> corresponding vfio steps? >>> >>> PCI bridges masking devices is not as uncommon as you'd like, that's >>> exactly why Andreas is using VFIO instead of KVM assignment. >> >> Well, we are using it in production for quite a while with few such reports. > > In the enterprise space, sure. In the hobbiest/power user space, I > suspect users are too often finding that it doesn't work and move on to > something else. Maybe we'll know if it's working better if we get more > complaints about random oddball devices not working because people are > actually able to get far enough to try it. I think it's the complete 900-chipset series of AMD (990FX, 990X [the one I'm using] and 970 - Socket AM3+), which provides the desktop user with payable IOMMU support (e.g. http://www.gigabyte.us/products/list.aspx?s=42&jid=7&p=2&v=26 ). I already read from other users having the same problem. Thanks, kind regards, Andreas