Enlightenments are enhancements made to the operating system to help reduce the cost of certain operating system functions. Presently, all recent Microsoft OSes support Hyper-V enlightened I/O and hypervisor aware kernels. Number of Hyper-V Enlightenments, like virtual APIC, spinlocks and invariant TSC can be implemented in KVM.
This presentation should be interesting to a wide audience, but mostly targeted to developers.