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When a device is ready to be activated signal to the VMM thread via an EventFd that there is a device to be activated. When the VMM receives a notification on the EventFd that there is a device to be activated notify the device manager to attempt to activate any devices that have not been activated. As a side effect the VMM thread will create the virtio device threads. Fixes: #1863 Signed-off-by: Rob Bradford <robert.bradford@intel.com>