How to create out-of-tree QEMU devices?

Question

Two possible mechanisms come to mind:

• IPC like the existing QMP and QAPI
• QEMU loads a shared library plugin that contains the model

Req

Answer 1

There is at least one fork of QEMU I'm aware of that offers shared library plugins for QEMU... but it's a fork of QEMU 4.0.

https://github.com/cromulencellc/qemu-shoggoth

It is possible to build out of tree plugins with this fork, though it's not documented.