You can remove the Oracle Virtual Networking host drivers in Oracle Solaris 11.3 OS by uninstalling them.
root@netra:~# pkg uninstall ovn-virtual-io Packages to remove: 1 Create boot environment: Yes Create backup boot environment: No PHASE ITEMS Removing old actions 32/32 Updating package state database Done Updating package cache 1/1 Updating image state Done Creating fast lookup database Done Updating package cache 4/4 A clone of sol_83_2 exists and has been updated and activated. On the next boot the Boot Environment sol_83_2-1 will be mounted on '/'. Reboot when ready to switch to this updated BE. Updating package cache 4/4
A new boot environment is created. After reboot the server will be booted into the new BE.
root@netra:~# svcs -a | grep ovn-virtual root@netra:~#