Paravirtualization

Paravirtualization (IBM "DIAGNOSE code", Parallels "hypercall") refers to the provision of a software interface that is not identical to the exact hardware component; but has some similarities to it. The technology for virtualization requires the migration or porting of the operating system so that execution on the VM can be made possible. The porting reduces the setup effort of the virtual machine and significantly optimizes the performance for the execution.