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Active monitoring of virtual machine (VM) behaviors and their utilization of different resource types is critical for effective management of high end cluster machines, data centers, and cloud computing infrastructures. Unfortunately, for reasons of performance, certain types of existing and future devices support capabilities that provide VMs with direct access to device resources, thereby bypassing the virtual machine monitor (VMM). This presents significant challenges to the VMM due to its resulting inability to assess VMdevice interactions. This paper describes a monitoring utility, IBMon, which enables the asynchronous monitoring of virtualized Infini-Band devices -- a sample VMM-bypass device heavily used in the HPC community. In the absence of adequate hardware supported monitoring information, IBMon uses dynamic memory introspection techniques to infer information regarding the VM-device interactions. Experimental results demonstrate that IBMon can asynchronously monitor VMM-bypass operations with acceptable accuracy, and negligible overheads, including for larger number of VMs, and for VMs with dynamic behavior patterns.