Upgrading z/VM 6.4 to z/VM 7.2 and following "Upgrade z/VM In Place" instructions in VM:Secure Install guide.
When does VM:Secure's UPGDMIXT EXEC get involved?
Release : 3.2
Component : VM:Secure for z/VM
Complete "Upgrade z/VM In Place" Instructions can be found in the VM:Secure Administrators guide at:
https://techdocs.broadcom.com/us/en/ca-mainframe-software/traditional-management/ca-vm-secure-for-z-vm-with-security/3-2/administrators/upgrade-z-vm-in-place.html#concept.dita_96db0a1337794252a73d33a9214f618322b3b10a_UpgradingzVM640orZVM710tozVM720
Basically, if you follow the VM:Secure instructions for Upgrade In Place (UIP), you can assume that any instruction that says the VMANAGER Common Disk must be linked and accessed, that UIP may call VM:Secure to perform some function.