Incus VM with e1000e Network Driver

Incus
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If you just want to alter the existing devices rather than define new ones from scratch, you can use the raw.qemu.scriptlet option to perform boot time re-configuration of those devices.

  raw.qemu.scriptlet: |
    def qemu_hook(instance, stage):
      if stage != "pre-start":
        return

      # Convert ethernet
      eth0_bus = run_qmp({"execute": "qom-get", "arguments": {"path": "/machine/peripheral/dev-incus_eth0", "property": "parent_bus"}})["return"].split("/")[-1]
      eth0_addr = run_qmp({"execute": "qom-get", "arguments": {"path": "/machine/peripheral/dev-incus_eth0", "property": "addr"}})["return"]
      eth0_mac = run_qmp({"execute": "qom-get", "arguments": {"path": "/machine/peripheral/dev-incus_eth0", "property": "mac"}})["return"]
      eth0_netdev = run_qmp({"execute": "qom-get", "arguments": {"path": "/machine/peripheral/dev-incus_eth0", "property": "netdev"}})["return"]
      run_qmp({"execute": "device_del", "arguments": {"id": "dev-incus_eth0"}})
      run_qmp({"execute": "system_reset"})
      run_qmp({"execute": "device_add", "arguments": {"id": "dev-incus_eth0", "driver": "e1000e", "bus": eth0_bus, "addr": eth0_addr, "netdev": eth0_netdev, "mac": eth0_mac}})

This effectively captures all the useful properties from the Incus-generated device, then removes it, restarts the emulator and adds the device back with the different driver.

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