Assuming that Oracle VM VirtualBox has already been installed into your zone, you need to give the zone access to Oracle VM VirtualBox's device node. This is done by performing the following steps. Start a root terminal and run the following command:

zonecfg -z vboxzone
                  

Replace vboxzone with the name of the zone where you intend to run Oracle VM VirtualBox.

Use zonecfg to add the device resource and match properties to the zone, as follows:

zonecfg:vboxzone>add device
zonecfg:vboxzone:device>set match=/dev/vboxdrv
zonecfg:vboxzone:device>end
zonecfg:vboxzone>add device
zonecfg:vboxzone:device>set match=/dev/vboxdrvu
zonecfg:vboxzone:device>end
zonecfg:vboxzone>exit

On Oracle Solaris 11 or later, you may also add a device for /dev/vboxusbmon, similar to that shown above.

If you are not using sparse root zones, you will need to loopback mount /opt/VirtualBox from the global zone into the non-global zone at the same path. This is specified below using the dir attribute and the special attribute. For example:

zonecfg:vboxzone>add fs
zonecfg:vboxzone:device>set dir=/opt/VirtualBox
zonecfg:vboxzone:device>set special=/opt/VirtualBox
zonecfg:vboxzone:device>set type=lofs
zonecfg:vboxzone:device>end
zonecfg:vboxzone>exit

Reboot the zone using zoneadm and you should be able to run Oracle VM VirtualBox from within the configured zone.