Re: Status of virtio-iommu

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Oct 30, 2017 at 11:31:06AM +0000, Jean-Philippe Brucker wrote:
> Hi Michael,
> 
> Sorry you couldn't make it to the KVM forum, I hope everything is fine on
> your side. The virtio discussions were interesting, and I'm still trying
> to wrap my head around the packed ring layout.
> 
> >From a few conversations I had in Prague and in private, it seems like
> many companies are interested in virtio-iommu. So I think the next step is
> to try to upstream the Linux driver (I will send the patch shortly),
> followed by Qemu device.
> 
> Afterwards we'll analyze performance and try various optimizations, since
> both device and driver are very simplistic and suboptimal at the moment.
> I'd like to start this optimization work after upstreaming device and
> driver, so it's easier to review and people can reproduce our benchmark
> results. Then I'd also like to study some ideas that should drastically
> improve interaction with virtio/vhost-based endpoints, which could be the
> subject of another publication and talk.
> 
> The code and specification is being reviewed by people specializing in Arm
> and x86 IOMMUs, but unfortunately not many specializing in virtio. Eric
> Auger and others are planning to review the Linux driver.
> 
> In order to upstream the driver, I'd like to request a virtio device ID,
> but can't figure out what the correct route is. I was planning to send a
> specification patch to the virtio-dev mailing list, but should I first
> fill a ticket on issues.oasis-open.org?
> 
> Thanks,
> Jean

Actually I am working on documenting the process.

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What is the process the make small changes to the spec?

git clone https://github.com/oasis-tcs/virtio-spec
edit spec
sh makeall.sh

Make sure you get a working pdf. Requires xelatex.
Recommended distribution: tex live.

Right now builds on linux. Patches for other OS-es welcome.

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Send your patch to: virtio-comment@lists.oasis-open.org

Wait up to 1 week for possible comments, and reply as appropriate.

Send email to the mailing list, and copy the chair (mst@redhat.com)
asking for a ballot to approve the change.
Ballot runs for 1 week.

Patch will be merged in a couple of days after that.

-----

Adding an issue saves me work, if you can do it and list issue
number in the commit log, that's great.

-- 
MST