You should update the Oracle VM Guest Additions packages regularly to ensure they function correctly. You should update the packages after you create a new virtual machine from an Oracle VM template on which the Oracle VM Guest Additions are installed.
To update the Oracle VM Guest Additions, do the following:
Ensure your virtual machine is connected to a yum repository that contains the packages for the Oracle VM Guest Additions.
Run the yum update command to install the packages; for example,
# yum update libovmapi xenstoreprovider ovmd python-simplejson xenstoreprovider
For Microsoft Windows guests, the Oracle VM Guest Additions are included in the Oracle VM Paravirtual Drivers. Refer to the Oracle VM Paravirtual Drivers for Microsoft Windows documentation library. Follow the upgrade instructions for the selected release of the paravirtual drivers. Silent upgrade is available in case you need to upgrade a large number of Windows guests.