From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48299) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wznu6-0006fx-83 for qemu-devel@nongnu.org; Wed, 25 Jun 2014 10:10:32 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Wznu0-0000EN-46 for qemu-devel@nongnu.org; Wed, 25 Jun 2014 10:10:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:14520) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wzntz-0000EI-SF for qemu-devel@nongnu.org; Wed, 25 Jun 2014 10:10:20 -0400 Date: Wed, 25 Jun 2014 17:10:27 +0300 From: "Michael S. Tsirkin" Message-ID: <20140625141027.GE14578@redhat.com> References: <53AA9480.1010005@intel.com> <53AA96DF.6070501@redhat.com> <53AA9B58.6050803@intel.com> <20140625095533.GE6357@redhat.com> <53AA9D79.3080003@redhat.com> <53AA9F3A.5030004@intel.com> <20140625102119.GJ6357@redhat.com> <53AABC81.2090206@redhat.com> <20140625134727.GB14578@redhat.com> <53AAD45A.5090905@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <53AAD45A.5090905@redhat.com> Subject: Re: [Qemu-devel] [v5][PATCH 0/5] xen: add Intel IGD passthrough support List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: peter.maydell@linaro.org, xen-devel@lists.xensource.com, stefano.stabellini@eu.citrix.com, allen.m.kay@intel.com, Kelly.Zytaruk@amd.com, qemu-devel@nongnu.org, anthony.perard@citrix.com, anthony@codemonkey.ws, yang.z.zhang@intel.com, "Chen, Tiejun" On Wed, Jun 25, 2014 at 03:53:30PM +0200, Paolo Bonzini wrote: > Il 25/06/2014 15:47, Michael S. Tsirkin ha scritto: > >OK, so how about doing this: either for the ISA > >bridge, or for the VGA card itself: > > > > set subsystem vendor id to PCI_VENDOR_ID_XEN, > > set subsystem device id to PCH device id > > That would work, but the same problem would then arise for the MCH. The > driver there is banging at random places in the configuration space. > > This is why I asked for a solution that is future-proof, and since you can > make one that works for both MCH and PCH it is nice to do the work just > once. > > Paolo Q35 has MCH, so I don't see why we can't make that work, extending it as appropriate. Doing that for PIIX is iffy. Should we really do that? Q35 is there. -- MST