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When the running OS has been told that a CPU should be removed it will shutdown the CPU and then signal to the hypervisor via the "_EJ0" method on the device that ultimately writes into an I/O port than the vCPU should be shutdown. Upon notification the hypervisor signals to the individual thread that it should shutdown and waits for that thread to end. Signed-off-by: Rob Bradford <robert.bradford@intel.com>