Guest-to-world

The figure below illustrates guest-to-world communication using a virtio-net vdev in the guest and a devnp-vdevpeer-net.so driver in the hypervisor host connected via a bridge to an Ethernet driver also in the host.

Figure 1. Guest-to-world communication with a virtio-net vdev in the guest connected to a devnp-vdevpeer-net.so driver connected via a bridge to an Ethernet driver in the host.

Configure a virtio-net vdev

In the configuration for the VM hosting the guest, configure a virtio-net vdev so you can establish peer-to-peer communication with the devnp-vdevpeer-net.so driver. For example, for a QNX guest on an ARM board:

system qnx71-arm-guest
...
# The loc and intr gic options are for ARM only. The guest will see the
# virtio-net vdev as a memory-mapped I/O device at the specified location.

vdev virtio-net
	loc 0x1c0c0000
	intr gic:40
	mac aa:aa:aa:aa:aa:aa
	name p2p
	peer /dev/vdevpeers/vp0

This is exactly like the virtio-net vdev configuration in “Guest-to-host”.

Enable services in the host

In the host, you must start io-pkt-*, specifying the devnp-vdevpeer-net.so driver, start the internet services (inetd), then create a bridge. For example:

io-pkt-v6-hc \
	-d vdevpeer-net \
		peer=/dev/qvm/qnx71-arm-guest/p2p,bind=/dev/vdevpeers/vp0,mac=a0b0c0d0e0f0
	-d ravb mac=126ce901562c 
	-p tcpip pkt_typed_mem=below4G
	...
inetd
	/usr/bin/sshd
dhclient -nw -lf /tmp/dhclient.leases ravb0
        ...
        ifconfig bridge0 create
        brconfig bridge0 add ravb0 up

Note the -d ravb mac=126ce901562c option for io-pkt-v6-hc, which starts the driver for Renesas RAVB Ethernet interfaces needed to connect to the outside world.

Add the interface to the bridge in the host

You must then add the devnp-vdevpeer-net.so interface to the bridge in the host. For example:

ifconfig vp0 up
brconfig bridge0 add vp0

Finally, use the bridge in the host to connect the devnp-vdevpeer-net.so node to the Ethernet driver in the host (see “Acting as a bridge” in the QNX SDP Core Networking Stack User's Guide and brconfig in the Utilities Reference).