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Electronics 2017, 6(4), 93; https://doi.org/10.3390/electronics6040093

μRTZVisor: A Secure and Safe Real-Time Hypervisor

Centro Algoritmi, Universidade do Minho, 4800-058 Guimarães, Portugal
These authors contributed equally to this work.
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Received: 29 September 2017 / Accepted: 24 October 2017 / Published: 30 October 2017
(This article belongs to the Special Issue Real-Time Embedded Systems)
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Abstract

Virtualization has been deployed as a key enabling technology for coping with the ever growing complexity and heterogeneity of modern computing systems. However, on its own, classical virtualization is a poor match for modern endpoint embedded system requirements such as safety, security and real-time, which are our main target. Microkernel-based approaches to virtualization have been shown to bridge the gap between traditional and embedded virtualization. This notwithstanding, existent microkernel-based solutions follow a highly para-virtualized approach, which inherently requires a significant software engineering effort to adapt guest operating systems (OSes) to run as userland components. In this paper, we present μ RTZVisor as a new TrustZone-assisted hypervisor that distinguishes itself from state-of-the-art TrustZone solutions by implementing a microkernel-like architecture while following an object-oriented approach. Contrarily to existing microkernel-based solutions, μ RTZVisor is able to run nearly unmodified guest OSes, while, contrarily to existing TrustZone-assisted solutions, it provides a high degree of functionality and configurability, placing strong emphasis on the real-time support. Our hypervisor was deployed and evaluated on a Xilinx Zynq-based platform. Experiments demonstrate that the hypervisor presents a small trusted computing base size (approximately 60KB), and a performance overhead of less than 2% for a 10 ms guest-switching rate. View Full-Text
Keywords: virtualization; hypervisor; TrustZone; microkernel; security; safety; real-time; Arm virtualization; hypervisor; TrustZone; microkernel; security; safety; real-time; Arm
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Martins, J.; Alves, J.; Cabral, J.; Tavares, A.; Pinto, S. μRTZVisor: A Secure and Safe Real-Time Hypervisor. Electronics 2017, 6, 93.

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