The CP-level Data Set Protection option is selected prior to updating the CP nucleus and results in the inclusion of additional CA Top Secret modules into the VM control program. Its function is to intercept actual I/O operations on DASD devices initiated by guest virtual machines. CP-level Data Set Protection does not rely on any guest interface, data set open processing routines, or additional code in the user’s address space, nor does it require the use of any specific guest operating system. It functions properly regardless of the method used by the virtual machine to perform the I/O operation, since it identifies the target data set of the operation by examination of the actual channel program before it reaches the hardware.
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