Hi Adam, On 16/08/17 05:08, Adam Tao wrote: >> * There is a working Qemu prototype [3], thanks to Eric Auger and Bharat >> Bhushan. > Hi, Brucker > I read the related spec for virtio IOMMU, > I am wondering if we support both the virtual and physical devices in > the guest to use the virtio IOMMU, how can we config the related address > translation for the different type of devices. > e.g. > 1. for Virtio devs(e.g. virtio-net), we can change the memmap table used > by the vhost device. > 2. for physical devices we can directly config the IOMMU/SMMU on the > host. > > So do you know are there any RFCs for the back-end implementation for the virtio-IOMMU > thanks > Adam Eric's series [3] adds support for virtual devices (I'v only had time to test virtio-net so far, but as vhost-iotlb seems to be supported by Qemu, it should work with vhost-net as well). Bharat is working on the VFIO backend for physical devices. As far as I'm aware, his latest version is: [7] https://lists.gnu.org/archive/html/qemu-devel/2017-07/msg04094.html Thanks, Jean >> [1] http://www.spinics.net/lists/kvm/msg147990.html >> [2] git://linux-arm.org/virtio-iommu.git branch viommu/v0.4 >> http://www.linux-arm.org/git?p=virtio-iommu.git;a=blob;f=dist/v0.4/virtio-iommu-v0.4.pdf >> I reiterate the disclaimers: don't use this document as a reference, >> it's a draft. It's also not an OASIS document yet. It may be riddled >> with mistakes. As this is a working draft, it is unstable and I do not >> guarantee backward compatibility of future versions. >> [3] https://lists.gnu.org/archive/html/qemu-arm/2017-08/msg00004.html >> [4] git://linux-arm.org/linux-jpb.git virtio-iommu/v0.4 >> Warning: UAPI headers have changed! They didn't follow the spec, >> please update. (Use branch v0.1, that has the old headers, for the >> Qemu prototype [3]) >> [5] git://linux-arm.org/kvmtool-jpb.git virtio-iommu/v0.4 >> Warning: command-line has changed! Use --viommu vfio[,opts] and >> --viommu virtio[,opts] to instantiate a device. >> [6] http://www.linux-arm.org/git?p=virtio-iommu.git;a=tree;f=dist/diffs
