Bringing together real-time and Virtualization

 

sysgo

This White Paper is presented to you by SYSGO

Virtualization is a long established technology in the server world. It has been used for decades as an enabler for platform consolidation. In the recent years, the technology has also gained new public interest due to its availability for Desktop PC platforms. The fact that it can provide strong isolation between applications and that this level of isolation can be achieved with only a very small layer of trusted code has also raised interest from the security related field of applications.

The possibility to integrate multiple independent subsystems in a single physical machine could also prove beneficial for many safety-critical applications. There is for instance a clear consolidation trend in distributed control systems, e.g. of aircraft or cars. However, in addition to the spatial isolation that virtualization readily provides, most of these applications also require some level of temporal determinism: Each subsystem typically interacts with a technical component and, consequently, it has to keep up with that component’s timing properties. Depending on the technical component, these timing constraints may vary over several orders of magnitude between individual subsystems. A generic platform for the consolidation of control systems must be able to cover this entire range, so its scheduling technique must be more versatile than the proportional sharing approach that is typically used by standard virtual machine monitors.

In this contribution, we look at the requirements for virtual machine monitors which result from supporting a mixture of hard real-time, soft real-time and best-effort applications. Also, an example of a scheduling infrastructure suitable to cover these requirements is presented...

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    VIRTUAL CONFERENCES

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