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Subject: Re: [virtio-dev] [RFC] virtio-iommu version 0.4

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


>> [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

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