Folks, If you go to the z/VM 5.4 Information Center and lookup the CP Programming Services manual you will find a new diagnose 2a8 documented there. This is what we use in the OpenSolaris port for our layer 2 network driver. This is what came with VM64466 (and its follow-on):
Privilege Class: Any Addressing Mode: 31-bit or 64-bit DIAGNOSE code X'2A8' establishes a network connection on a z/VM simulated network device in order to transmit and receive Ethernet frames. It provides a virtual machine with device-independent access to a simulated NIC created with a CP DEFINE NIC command that is coupled with a CP COUPLE command to either an Ethernet VSWITCH or Ethernet QDIO guest LAN. Neale