From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161036AbbKSPt5 (ORCPT ); Thu, 19 Nov 2015 10:49:57 -0500 Received: from mx1.redhat.com ([209.132.183.28]:52958 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934412AbbKSPtz (ORCPT ); Thu, 19 Nov 2015 10:49:55 -0500 Subject: Re: [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated Graphics Passthrough Solution from Intel To: Stefano Stabellini , Jike Song References: <53D215D3.50608@intel.com> <547FCAAD.2060406@intel.com> <54AF967B.3060503@intel.com> <5527CEC4.9080700@intel.com> <559B3E38.1080707@intel.com> <562F4311.9@intel.com> <1447870341.4697.92.camel@redhat.com> <564D78D0.80904@intel.com> Cc: Alex Williamson , "Tian, Kevin" , "xen-devel@lists.xen.org" , "igvt-g@ml01.01.org" , "intel-gfx@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "White, Michael L" , "Dong, Eddie" , "Li, Susie" , "Cowperthwaite, David J" , "Reddy, Raghuveer" , "Zhu, Libo" , "Zhou, Chao" , "Wang, Hongbo" , "Lv, Zhiyuan" , qemu-devel , Gerd Hoffmann From: Paolo Bonzini Message-ID: <564DEF9A.3010901@redhat.com> Date: Thu, 19 Nov 2015 16:49:46 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19/11/2015 16:32, Stefano Stabellini wrote: > > In addition to Kevin's replies, I have a high-level question: can VFIO > > be used by QEMU for both KVM and Xen? > > No. VFIO cannot be used with Xen today. When running on Xen, the IOMMU > is owned by Xen. I don't think QEMU command line compatibility between KVM and Xen should be a design goal for GVT-g. Nevertheless, it shouldn't be a problem to use a "virtual" VFIO (which doesn't need the IOMMU, because it uses the MMU in the physical GPU) even under Xen. Paolo From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41247) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZzRTD-0007bo-HO for qemu-devel@nongnu.org; Thu, 19 Nov 2015 10:50:05 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZzRT9-0000qs-EI for qemu-devel@nongnu.org; Thu, 19 Nov 2015 10:49:59 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58342) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZzRT9-0000qh-8f for qemu-devel@nongnu.org; Thu, 19 Nov 2015 10:49:55 -0500 References: <53D215D3.50608@intel.com> <547FCAAD.2060406@intel.com> <54AF967B.3060503@intel.com> <5527CEC4.9080700@intel.com> <559B3E38.1080707@intel.com> <562F4311.9@intel.com> <1447870341.4697.92.camel@redhat.com> <564D78D0.80904@intel.com> From: Paolo Bonzini Message-ID: <564DEF9A.3010901@redhat.com> Date: Thu, 19 Nov 2015 16:49:46 +0100 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated Graphics Passthrough Solution from Intel List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefano Stabellini , Jike Song Cc: "igvt-g@ml01.01.org" , "Tian, Kevin" , "Reddy, Raghuveer" , qemu-devel , "White, Michael L" , "Cowperthwaite, David J" , "intel-gfx@lists.freedesktop.org" , "Li, Susie" , "Dong, Eddie" , "linux-kernel@vger.kernel.org" , "xen-devel@lists.xen.org" , Alex Williamson , Gerd Hoffmann , "Zhou, Chao" , "Zhu, Libo" , "Wang, Hongbo" , "Lv, Zhiyuan" On 19/11/2015 16:32, Stefano Stabellini wrote: > > In addition to Kevin's replies, I have a high-level question: can VFIO > > be used by QEMU for both KVM and Xen? > > No. VFIO cannot be used with Xen today. When running on Xen, the IOMMU > is owned by Xen. I don't think QEMU command line compatibility between KVM and Xen should be a design goal for GVT-g. Nevertheless, it shouldn't be a problem to use a "virtual" VFIO (which doesn't need the IOMMU, because it uses the MMU in the physical GPU) even under Xen. Paolo From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [Announcement] 2015-Q3 release of XenGT - a Mediated Graphics Passthrough Solution from Intel Date: Thu, 19 Nov 2015 16:49:46 +0100 Message-ID: <564DEF9A.3010901@redhat.com> References: <53D215D3.50608@intel.com> <547FCAAD.2060406@intel.com> <54AF967B.3060503@intel.com> <5527CEC4.9080700@intel.com> <559B3E38.1080707@intel.com> <562F4311.9@intel.com> <1447870341.4697.92.camel@redhat.com> <564D78D0.80904@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2C2936E9B9 for ; Thu, 19 Nov 2015 07:49:55 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Stefano Stabellini , Jike Song Cc: "igvt-g@ml01.01.org" , "Reddy, Raghuveer" , "White, Michael L" , "Cowperthwaite, David J" , "intel-gfx@lists.freedesktop.org" , "Li, Susie" , "Dong, Eddie" , "linux-kernel@vger.kernel.org" , "xen-devel@lists.xen.org" , qemu-devel , "Zhou, Chao" , "Zhu, Libo" , "Wang, Hongbo" List-Id: intel-gfx@lists.freedesktop.org CgpPbiAxOS8xMS8yMDE1IDE2OjMyLCBTdGVmYW5vIFN0YWJlbGxpbmkgd3JvdGU6Cj4gPiBJbiBh ZGRpdGlvbiB0byBLZXZpbidzIHJlcGxpZXMsIEkgaGF2ZSBhIGhpZ2gtbGV2ZWwgcXVlc3Rpb246 IGNhbiBWRklPCj4gPiBiZSB1c2VkIGJ5IFFFTVUgZm9yIGJvdGggS1ZNIGFuZCBYZW4/Cj4gCj4g Tm8uIFZGSU8gY2Fubm90IGJlIHVzZWQgd2l0aCBYZW4gdG9kYXkuIFdoZW4gcnVubmluZyBvbiBY ZW4sIHRoZSBJT01NVQo+IGlzIG93bmVkIGJ5IFhlbi4KCkkgZG9uJ3QgdGhpbmsgUUVNVSBjb21t YW5kIGxpbmUgY29tcGF0aWJpbGl0eSBiZXR3ZWVuIEtWTSBhbmQgWGVuIHNob3VsZApiZSBhIGRl c2lnbiBnb2FsIGZvciBHVlQtZy4KCk5ldmVydGhlbGVzcywgaXQgc2hvdWxkbid0IGJlIGEgcHJv YmxlbSB0byB1c2UgYSAidmlydHVhbCIgVkZJTyAod2hpY2gKZG9lc24ndCBuZWVkIHRoZSBJT01N VSwgYmVjYXVzZSBpdCB1c2VzIHRoZSBNTVUgaW4gdGhlIHBoeXNpY2FsIEdQVSkKZXZlbiB1bmRl ciBYZW4uCgpQYW9sbwpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fXwpJbnRlbC1nZnggbWFpbGluZyBsaXN0CkludGVsLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5v cmcKaHR0cDovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ludGVsLWdm eAo=