Timing Analysis for Hypervisor-based I/O Virtualization in Safety-related Automotive Systems

Paper #:
  • 2017-01-1621

Published:
  • 2017-03-28
Abstract:
A trend of future vehicle generations is the development of intelligent functions which are able to execute driving tasks and hence continuously automates the car. The complexity of the necessary functions correlates with the “Levels of Driving Automation (SAE standard J3016)” so that today’s E/E architecture has to be revised to meet the requirements. A possible approach includes a consolidation of several ECUs to highly-integrated multicore domain controllers (DCUs). This DCUs form interfaces between the corresponding domain and a central communication gateway. The consolidation also requires an isolation of functions to guarantee the freedom from interference defined in the ISO 26262 standard. This isolation can be realized by a hypervisor-based virtualization while embedded hypervisors are still not widely spread in automotive ECUs due to temporal and spatial overhead. Our contribution includes a timing analysis for a virtualized CAN communication based on requirements and features of CAN messages used in a series production vehicle. We consider a highly-integrated DCU which partly consolidates two chassis ECUs by using hypervisor partitions. The corresponding CAN communication between the virtualized ECUs and also with an ECU from another vehicle domain is handled by the hypervisor. For our timing analysis, we map the timing requirements to four different approaches for time partition scheduling. The results are also compared to a common AUTOSAR implementation. Furthermore, the measuring results are finally compared to the values of a model-based timing simulation.
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