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If a device is part of a PM Domain (e.g. power and/or clock domain), its power state is managed using Runtime PM. Without Runtime PM, the device may not be powered up or clocked, causing subtle failures, crashes, or system lock-ups when the device is accessed by the guest. Fix this by adding Runtime PM support, powering the device when the VFIO device is opened by the guest. Signed-off-by: Geert Uytterhoeven <[email protected]> Reviewed-by: Simon Horman <[email protected]> Acked-by: Eric Auger <[email protected]> Signed-off-by: Alex Williamson <[email protected]>