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Zachary J. Estrada, University of Illinois at Urbana-Champaign, Cuong Pham, University of Illinois at Urbana-Champaign, Fei Deng, University of Illinois at Urbana-Champaign, Zbigniew Kalbarczyk, University of Illinois at Urbana-Champaign, Ravishankar K. Iyer, University of Illinois at Urbana-Champaign, Lok Yan, Air Force Research Laboratory.  2015.  Dynamic VM Dependability Monitoring Using Hypervisor Probes. 11th European Dependable Computing Conference- Dependability in Practice (EDCC 2015).

Many current VM monitoring approaches require guest OS modifications and are also unable to perform application level monitoring, reducing their value in a cloud setting. This paper introduces hprobes, a framework that allows one to dynamically monitor applications and operating systems inside a VM. The hprobe framework does not require any changes to the guest OS, which avoids the tight coupling of monitoring with its target. Furthermore, the monitors can be customized and enabled/disabled while the VM is running. To demonstrate the usefulness of this framework, we present three sample detectors: an emergency detector for a security vulnerability, an application watchdog, and an infinite-loop detector. We test our detectors on real applications and demonstrate that those detectors achieve an acceptable level of performance overhead with a high degree of flexibility.