Hi, Several projects are underway to create an inter-VM device emulation interface: * ivshmem v2 https://www.mail-archive.com/qemu-devel@xxxxxxxxxx/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@xxxxxxxxxxxxxxxxxxxx/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 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
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