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Unfortunately, it is non-trivial to attribute hardware events to multiple virtual tenants, as some system's metrics relate to the whole system (e.g., RAPL energy counters). Virtualized environments have then a rather incomplete picture of how tenants use the hardware, limiting their optimization capabilities. Thus, we propose XeM-Power, a lightweight monitoring solution for Xen that precisely accounts hardware events to guest workloads. It also enables attribution of CPU power consumption to individual tenants. 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