LPARs are implemented on hardware/microcode level (some older implementations even involve actual physical switches in the CPU and IO buses for partitioning the system), so OS does not have to even know about it.
The main feature of virtualization on zArchitecture are not LPARs, but the fact that that it meets the Popek and Goldberg virtualization requirements perfectly and thus there are no artificial limits on how deep you can nest the hypervisors. In fact even the process in z/OS can almost behave as if it was running directly on hardware.
The main feature of virtualization on zArchitecture are not LPARs, but the fact that that it meets the Popek and Goldberg virtualization requirements perfectly and thus there are no artificial limits on how deep you can nest the hypervisors. In fact even the process in z/OS can almost behave as if it was running directly on hardware.