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Execution driven microarchitecture simulators tend to devote a large portion of their source code to a front-end that performs instruction set level functional simulation, providing the decoded instruction stream to a back-end that performs timing simulation. In this paper we introduce the current incarnation of QSim, a universal front-end for execution driven multicore microarchitecture simulators. QSim adapts the popular and portable QEMU full-system emulator to a thread safe, instruction set neutral API, running unmodified application binaries in a lightly modified Linux operating system. QSim has been shown to support at least 512 emulated hardware threads, each running in a separate host thread.