Need vhost / vsock support

[rminnich]

In some environments, the only available network is vhost / vsock. It would be wonderful to have this in gokvm.

[rminnich]

https://github.com/qemu/qemu/blob/master/net/vhost-user.c may be a useful place to start understanding what a vmm needs to do.

[bobuhiro11]

Thanks for sharing the material. I would like to read it along with following documents:
https://www.qemu.org/docs/master/interop/vhost-user.html
https://access.redhat.com/solutions/3394851

[shehackedyou]

Ideally its best not to use it, but the purego module originally written for the Ebiten 2d game engine will enable you to call in *.so without cgo. It would be a temporary fix.

You are doing an outstanding job; I actually had started working on this but due to life events could not finish it so Im very excited to see this and find out ways I can assist.

[bobuhiro11]

Thanks for the comment. And sorry for the late reply.
I'm not familiar with ebiten, so if you have any doc on how to get *.so and how to integrate it, that would help us understand it a bit better.

[yushoyamaguchi]

@bobuhiro11
Is this issue stopping?
Could I try?

[bobuhiro11]

@yushoyamaguchi
Yes, it’s stopping now.
Of course, there is no problem to develop this feature!
Thank you.

[yushoyamaguchi]

@bobuhiro11

Thank you for your reply.
I’d like to confirm one thing:
Which is focused on in this discussion ?

1. vhost-user : The backend processing is handled by the user space bypassing kernel. (e.g., DPDK )
2. vhost-net : The backend processing is handled by the kernel.

My interest is 2.

I'm so sorry if my understanding is wrong.

[bobuhiro11]

@yushoyamaguchi

My understanding is that we need to implement vhost-net and then vsock on top of that. it seems to be 2 steps.
Right now gokvm does not have these implementations, only a naive virtio-net implementation that reads/writes directly from gokvm to the tap device.

So I think it fits your interest in "2 vhost-net". You can either do the ip/tcp communication over vhost-net or include vhost-vsock.

Again, thanks for your interest!

ref: https://lencerf.github.io/post/2023-05-28-virtio-vhost-vsock/