From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [v5][PATCH 0/5] xen: add Intel IGD passthrough support Date: Thu, 26 Jun 2014 15:30:11 +0200 Message-ID: <53AC2063.2070501@redhat.com> References: <53AA8E7D.809@intel.com> <20140625090925.GH32652@redhat.com> <53AA9480.1010005@intel.com> <53AA96DF.6070501@redhat.com> <53AA9B58.6050803@intel.com> <53AA9C4E.9070506@redhat.com> <53ABE551.3080407@intel.com> <53ABF00E.6000309@redhat.com> <20140626112603.GC21685@redhat.com> <53AC0462.8010207@redhat.com> <20140626113624.GG21685@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20140626113624.GG21685@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org To: "Michael S. Tsirkin" Cc: peter.maydell@linaro.org, xen-devel@lists.xensource.com, stefano.stabellini@eu.citrix.com, allen.m.kay@intel.com, qemu-devel@nongnu.org, Kelly.Zytaruk@amd.com, yang.z.zhang@intel.com, anthony@codemonkey.ws, anthony.perard@citrix.com, "Chen, Tiejun" List-Id: xen-devel@lists.xenproject.org Il 26/06/2014 13:36, Michael S. Tsirkin ha scritto: >> It should be this way in real hardware too > But it isn't. That's why I mentioned that this hack should become architecturally specified (since it can work on real hardware too) with QEMU doing the emulation for current-generation devices. > > (not exactly _this_ hack, but at least no improper relationship among > > IGD/MCH/PCH). > > Well that dependency between devices is common for embedded hardware, > and this is what we have here. Sure, but then you should put MCH/PCH/IGD in the same IOMMU group, which basically means forgetting about IGD assignment. Paolo