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Computing performance and scalability are the essential basics in modern data centres. Field Programmable Gate Arrays (FPGAs) provide a promising opportunity to improve performance, security and energy efficiency. Especially background acceleration of computationally complex and long-running tasks is an important field of application. A flexible use of reconfigurable devices within a cloud context requires an abstraction of the actual hardware through virtualization. In this paper we present an approach inspired by paravirtualized machines for the integration of reconfigurable hardware into cloud services. Using partial reconfiguration our hardware and software framework virtualizes a single physical FPGA to enable multiple independent user designs. Essential components are the management of those virtual user-defined accelerators (vFPGA) and their migration between physical FPGAs to achieve higher system-wide utilization. The migration requires saving and restoring the internal state or context of the vFPGA. We demonstrate the application possibilities and the resource trade-off of our approach by transferring a running design from one physical FPGA to another. Moreover, we present future perspectives for the use of FPGAs in cloud-based environments.