Comment 3 for bug 1838939

When kernel device is probed, its vendor ID and device ID are used to ask user-mode library to find the correct device driver in user-mode. The patch will enable the correct user-mode driver is selected. There is no additional configuration or time spent on the device initialization, because at this time the kernel-mode driver is already loaded and running, regardless if user-mode driver is loaded or net. To end user, the cost and billing are not dependent on what driver is in use. If the hardware is attached to VM, the billing is already in progress.