This a clone of QEMU project: https://www.qemu.org/download/
This repo currently develops Out-of-process QEMU. Out-of-process QEMU allows QEMU to attach device running remotely on a separate process.
The QEMU which runs the CPU and executes KVM ioctls is called the client QEMU. The QEMU which emulates the devices remotely is called the server. The server is also a QEMU instance which is a machine of type 'TYPE_REMOTE_MACHINE'. The server exclusively emulates devices and does not emulate CPUs.
The client and server interact using the vfio-user protocol. Please refer to the following for the vfio-user protocol specification: https://patchew.org/QEMU/20210414114122.236193-1-thanos.makatos@nutanix.com/
This repo. has both the client and server code. The server extends the following vfio-user library implemented by Nutanix: https://github.com/nutanix/libvfio-user.git
Please checkout scripts/vfiouser-launcher.py for a sample Orchestrator which demonstrates how to use vfio-user with QEMU.