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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>
  1. 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>