Re: Inter-VM device emulation (call on Mon 20th July 2020)

Jan Kiszka
2020-07-15T11:47:14Z

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On 15.07.20 13:23, Stefan Hajnoczi wrote:
> Hi,
> Several projects are underway to create an inter-VM device emulation
> interface:
>
> * ivshmem v2
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg706465.html
>
> A PCI device that provides shared-memory communication between VMs.
> This device already exists but is limited in its current form. The
> "v2" project updates IVSHMEM's capabilities and makes it suitable as
> a VIRTIO transport.
>
> Jan Kiszka is working on this and has posted specs for review.
>
> * virtio-vhost-user
> https://www.mail-archive.com/virtio-dev@lists.oasis-open.org/msg06429.html
>
> A VIRTIO device that transports the vhost-user protocol. Allows
> vhost-user device emulation to be implemented by another VM.
>
> Nikos Dragazis is working on this with QEMU, DPDK, and VIRTIO patches
> posted.
>
> * VFIO-over-socket
> https://github.com/tmakatos/qemu/blob/master/docs/devel/vfio-over-socket.rst
>
> Similar to the vhost-user protocol in spirit but for any PCI device.
> Uses the Linux VFIO ioctl API as the protocol instead of vhost.
>
> It doesn't have a virtio-vhost-user equivalent yet, but the same
> approach could be applied to VFIO-over-socket too.
>
> Thanos Makatos and John G. Johnson are working on this. The draft
> spec is available.
>
> Let's have a call to figure out:
>
> 1. What is unique about these approaches and how do they overlap?
> 2. Can we focus development and code review efforts to get something
> merged sooner?
>
> Jan and Nikos: do you have time to join on Monday, 20th of July at 15:00
> UTC?
> https://www.timeanddate.com/worldclock/fixedtime.html?iso=20200720T1500
>

Not at that slot, but one hour earlier or later would work for me (so far).

Jan

> Video call URL: https://bluejeans.com/240406010
>
> It would be nice if Thanos and/or JJ could join the call too. Others
> welcome too (feel free to forward this email)!
>
> Stefan
>

--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

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