Guest-to-world

This section describes a configuration for a guest communicating with the outside world through network drivers in the hypervisor host.

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

Figure 1Guest-to-world communication with a virtio-net vdev in the guest connected to a mods-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 that you can establish peer-to-peer communication with the mods-vdevpeer-net.so driver. For example, for a QNX guest on an ARM board: 
system qnx80-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
  peerfeats checksum

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

Enable services in the host

In the host, start by starting io-sock, specifying mods-vdevpeer-net.so and other network drivers. For example: 
io-sock -o config=/etc/system/config/net/io-sock.conf -m phy -m fdt -m phy_fdt \
    -m pci -d em -m vdevpeer-net

Note the -d em option for io-sock, which starts the driver for an Intel PRO/1000 Gigabit Ethernet adapter needed to connect to the outside world.

Next, bring up the network interfaces in the host. For example:
if_up -p em0
ifconfig em0 up
ifconfig vp0 create up
vpctl vp0 peer=/dev/qvm/qnx80-arm-guest/p2p bind=/dev/vdevpeers/vp0 mac=a0b0c0d0e0f0
Use a command like the following to configure the MAC address for the bridge and add the appropriate network interface (or interfaces) to it:
sysctl -w net.link.bridge.inherit_mac=1 > /dev/null
ifconfig bridge0 create up addm vp0 addm em0
Use dhcpcd to assign network IP addresses. For example:
dhcpcd -bqq -w bridge0
Finally, configure other networking services. For example:
ifconfig vp0 -txcsum -txcsum6 -tso6 -tso4
ifconfig vp1 -txcsum -txcsum6 -tso6 -tso4
/proc/boot/.ssh-server.sh
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