> -----Original Message-----
> From: [email protected] <[email protected]> On
> Behalf Of Stefan Hajnoczi
> Sent: 15 July 2020 12:24
> To: Nikos Dragazis <[email protected]>; Jan Kiszka
> <[email protected]>
> Cc: Michael S. Tsirkin <[email protected]>; Thanos Makatos
> <[email protected]>; John G. Johnson
> <[email protected]>; Andra-Irina Paraschiv
> <[email protected]>; Alexander Graf <[email protected]>; qemu-
> [email protected]; [email protected]; Maxime Coquelin
> <[email protected]>; Alex Bennée <[email protected]>
> Subject: Inter-VM device emulation (call on Mon 20th July 2020)
>
> Hi,
> Several projects are underway to create an inter-VM device emulation
> interface:
>
> * ivshmem v2
> https://www.mail-archive.com/[email protected]/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/[email protected]
> 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=20200720T1
> 500
>
> 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)!
Sure!
>
> Stefan
