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== The Virtualization Stack and Other Root Partition Components ==
As previously noted, the root partition contains the ''Virtualization Stack''. This is a collection on of components which that provide a large amount of the Hyper-V functionality. The following diagram provides an abstract outline of the stack:
[[Image:hyper-v_virtualization_stack.jpg|The Hyper-V Virtualization Stack]]
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Operates in kernel mode (i.e . in the privileged CPU ring) and provides partition, memory and processor management for the virtual machines running in the child partitions. The Virtual Infrastructure Driver (Vid.sys) also provides the conduit for the components higher up the Virtualization Stack to communicate with the hypervisor.
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- '''Non Hyper-V Aware Operating Systems''' - These operating systems are unaware that they are running on a hypervisor and are unable to run the Integration Services. To support these operating systems, the Hyper-V hypervisor uses emulation to provide access to device and CPU resources. Whilst this approach allows unmodified, unenlightened operating systems to function within Hyper-V virtual machines, the overheads inherent in the emulation process can be significant.
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