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Re: [Xen-devel] [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated Graphics Passthrough Solution from Intel
- To: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Jike Song <jike.song@xxxxxxxxx>
- From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
- Date: Thu, 19 Nov 2015 16:49:46 +0100
- Cc: "igvt-g@xxxxxxxxxxx" <igvt-g@xxxxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Reddy, Raghuveer" <raghuveer.reddy@xxxxxxxxx>, qemu-devel <qemu-devel@xxxxxxxxxx>, "White, Michael L" <michael.l.white@xxxxxxxxx>, "Cowperthwaite, David J" <david.j.cowperthwaite@xxxxxxxxx>, "intel-gfx@xxxxxxxxxxxxxxxxxxxxx" <intel-gfx@xxxxxxxxxxxxxxxxxxxxx>, "Li, Susie" <susie.li@xxxxxxxxx>, "Dong, Eddie" <eddie.dong@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxx>, "Zhou, Chao" <chao.zhou@xxxxxxxxx>, "Zhu, Libo" <libo.zhu@xxxxxxxxx>, "Wang, Hongbo" <hongbo.wang@xxxxxxxxx>, "Lv, Zhiyuan" <zhiyuan.lv@xxxxxxxxx>
- Delivery-date: Thu, 19 Nov 2015 15:50:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.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
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