libvirt

You can configure vfio-user devices in a libvirt domain configuration:

1. Add xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' to the domain element.

2. Enable sharing of the guest's RAM:

<memoryBacking>
  <source type='file'/>
  <access mode='shared'/>
</memoryBacking>

3. Pass the vfio-user device:

<qemu:commandline>
  <qemu:arg value='-device'/>
  <qemu:arg value='{"driver":"vfio-user-pci","socket":{"path": "/tmp/vfio-user.sock", "type": "unix"}'/>
</qemu:commandline>