Microsoft announced today with it will be publishing the Hypercall APIs through the Open Specification Promise when Windows Server Virtualization ships. In addition they posted a draft of these interfaces in the form of a Hypervisor top-level functional specification on Microsoft downloads here. This document gives you and view of the external interfaces of the first generation hypervisor from Microsoft and contains the following information:

  • Introduction
  • Basic Data Types, Concepts and Notation
  • Feature and Interface Discovery
  • Hypercall Interface
  • Partition Management
  • Physical Hardware Management
  • Resource Management
  • Guest Physical Address Spaces
  • Intercepts
  • Virtual Processor Management
  • Virtual Processor Execution
  • Virtual MMU and Caching
  • Virtual Interrupt Control
  • Inter-Partition Communication
  • Timers
  • Message Formats
  • Partition Save and Restore
  • Scheduler
  • Event Logging
  • Guest Debugging Support
  • Statistics
  • Booting
  • Appendix

This is really cool and gives you a detailed view of how to interface with the Microsoft hypervisor.

For more information, go to the Virtualization Product team blog entry here