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VTF: A Timer Hypercall to Support Real-time of Guest Operating Systems  

Park, Mi-Ri (고려대학교 컴퓨터전파통신공학과)
Hong, Cheol-Ho (고려대학교 컴퓨터전파통신공학과)
Yoo, See-Hwan (고려대학교 컴퓨터전파통신공학과)
Yoo, Chuck (고려대학교 컴퓨터전파통신공학과)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.37, no.1, 2010 , pp. 35-42 More about this Journal
Abstract
Guest operating systems running over the virtual machines share a variety of resources. Since CPU is allocated in a time division manner it consequently leads them to having the unknown physical time. It is not regarded as a serious problem in the server virtualization fields. However, it becomes critical in embedded systems because it prevents guest OS from executing real time tasks when it does not occupy CPU. In this paper we propose a hypercall to register a timer service to notify the timer request related real time. It enables hypervisor to schedule a virtual machine which has real time tasks to execute, and allows guest OS to take CPU on time to support real time. The following experiment shows its implementation on Xen-Arm and para-virtualized Linux. We also analyze the real time performance with response time of test application and frames per second of Mplayer.
Keywords
Virtualization; Virtual Machine Monitor; Hypercall; Real Time; Embedded Software;
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