Inter-OS Communications for a Real-Time Dual-OS Monitor

概要

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Virtualization solutions that support collaboration among its guest OS enable the development of safe complex software architectures. Most studies addressing inter-OS communications focus on throughput improvements for hypervisors targeted at server consolidation or cluster computing. However, research on inter-OS communications for hard real-time virtualization, which requires different communication patterns and predictable latencies rather than high throughput, is still scarce. We present a novel approach to inter-OS communications based on a globally scheduled real-time dual-OS monitor that enables specifying the priority and bandwidth of each communication channel or port. Our approach takes advantage of memory and time isolation asymmetries to implement preemptable low-overhead communications. Three real-time communication patterns are supported: lock-free unqueued messages, priority-based message queues and shared memory. The architecture was implemented and compared to previous approaches to demonstrate its advantages for hard real-time virtualized systems.
2011-04-06