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Learn how to overcome QEMU's traditional timekeeping limitations through an innovative approach that redefines time control using the TCG plugin API. Discover the fundamental problems with QEMU's existing icount mode, which forces single-threaded execution and provides ambiguous instruction counts across multiple CPUs, then explore a groundbreaking solution that maintains multithreaded compatibility while delivering realistic instruction-based timing. Master the implementation of independent per-CPU time management through scoreboards and timeouts, understand how the active token mechanism coordinates global time progression, and examine how this new model handles idle-aware timekeeping by excluding inactive vCPUs from time advancement. Gain insights into the practical advantages of this modular approach, including its ability to seamlessly integrate into QEMU without requiring core architectural changes while supporting both multithreaded execution and deterministic simulation scenarios.
