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Unlike when running a native OS, power management activity has different types in a virtualization world: virtual and real. A virtual activity is limited to a virtual machine and has no effect on real power. For example, virtual S3 sleep only puts the virtual machine into sleep state, while other virtual machines may still work. On the other hand, a real activity operates on the physical hardware and saves real power. Since the virtual activity is well controlled by the guest OS, the remaining problem is how to determine the real activity according to the virtual activity.
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