Hierarchical power management

A tangible, non-transitory computer-readable storage medium storing instructions that, if executed by a processor to operate for interrupt handling, cause the processor to:

• maintain a plurality of virtualized FHF (fixed hardware feature(s)) codes responsive to a plurality of device interrupts and further responsive to a plurality of non-virtualized FHF codes;
• provide the plurality of virtualized FHF codes responsive to a first request from a first operating system;
• provide pass-through access to the plurality of non-virtualized FHF codes responsive to a second request from a second operating system;
• and
• set a power mode of hardware running the computing platform to be at a more active state than that reported by the virtualized FHF codes to the first operating system, if the second request requests the more active state and the first request requests a less active state.

An electronic device comprising:

• a controller;
• and
• a memory having instructions encoded therein, the instructions when executed by the controller cause said controller to operate for power management by steps comprising the acts of:
• maintaining a plurality of virtualized FHF (fixed hardware feature(s)) codes responsive to a plurality of device interrupts and further responsive to a plurality of non-virtualized FHF codes;
• providing the plurality of virtualized FHF codes responsive to a first request from a first operating system;
• providing pass-through access to the plurality of non-virtualized FHF codes responsive to a second request from a second operating system;
• and
• setting a power mode of hardware running the computing platform to be at a more active state than that reported by the virtualized FHF codes to the first operating system, if the second request requests the more active state and the first request requests a less active state.