On Thu, 19 Nov 2015, Paolo Bonzini wrote: > 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. Right, I agree. In fact I don't want my comment to be taken as "VFIO should not be used at all". I only meant to reply to the question. I think it is unlikely to be the best path for Xen, but it could very well be the right answer for KVM. > 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. That could be true, but I would expect some extra work to be needed to make use of VFIO on Xen. Also it might cause some duplication of functionalities with the current Xen passthrough code base. _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
