From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36153) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzjYN-0007Bf-2f for qemu-devel@nongnu.org; Wed, 25 Jun 2014 05:31:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WzjYF-0006DC-Kc for qemu-devel@nongnu.org; Wed, 25 Jun 2014 05:31:43 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55496) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WzjYF-0006D1-DT for qemu-devel@nongnu.org; Wed, 25 Jun 2014 05:31:35 -0400 Message-ID: <53AA96DF.6070501@redhat.com> Date: Wed, 25 Jun 2014 11:31:11 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1403662641-28526-1-git-send-email-tiejun.chen@intel.com> <53AA69E7.8050406@redhat.com> <53AA7BD7.1080309@intel.com> <53AA7DCE.2030100@redhat.com> <20140625083121.GC32652@redhat.com> <53AA8ACF.3070101@redhat.com> <20140625084835.GF32652@redhat.com> <53AA8E7D.809@intel.com> <20140625090925.GH32652@redhat.com> <53AA9480.1010005@intel.com> In-Reply-To: <53AA9480.1010005@intel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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: "Chen, Tiejun" , "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, anthony.perard@citrix.com, anthony@codemonkey.ws, yang.z.zhang@intel.com Il 25/06/2014 11:21, Chen, Tiejun ha scritto: >> Adding a vendor-specific capability or BAR >> in an existing device is painful - hard to find >> free space for it. > > Yes, this is a potential risk as well since we can't guarantee current > free space is always valid for ever. For past devices, we know which BARs they use. For future devices, it would be nice if the PCH/MCH backdoor was specified so that we know they will leave a free BAR for virtualization. Paolo 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: Wed, 25 Jun 2014 11:31:11 +0200 Message-ID: <53AA96DF.6070501@redhat.com> References: <1403662641-28526-1-git-send-email-tiejun.chen@intel.com> <53AA69E7.8050406@redhat.com> <53AA7BD7.1080309@intel.com> <53AA7DCE.2030100@redhat.com> <20140625083121.GC32652@redhat.com> <53AA8ACF.3070101@redhat.com> <20140625084835.GF32652@redhat.com> <53AA8E7D.809@intel.com> <20140625090925.GH32652@redhat.com> <53AA9480.1010005@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <53AA9480.1010005@intel.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: "Chen, Tiejun" , "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, anthony.perard@citrix.com, anthony@codemonkey.ws, yang.z.zhang@intel.com List-Id: xen-devel@lists.xenproject.org Il 25/06/2014 11:21, Chen, Tiejun ha scritto: >> Adding a vendor-specific capability or BAR >> in an existing device is painful - hard to find >> free space for it. > > Yes, this is a potential risk as well since we can't guarantee current > free space is always valid for ever. For past devices, we know which BARs they use. For future devices, it would be nice if the PCH/MCH backdoor was specified so that we know they will leave a free BAR for virtualization. Paolo