This patchsets move interrupt handling for usb-redir and usb-hid devices over from polling to async handling. Together with a patch to allow async stepdown in ehci when the periodic schedule only contains interrupt queues, and a patch to allow usb-hid devices to connect to ehci, this fixes the usb-tablet causing a crazy cpu load for idle guests.
With this patchset the cpuload for a fully idle vm with usb-tablet is lowered from 20% to 2-3% (on my laptop). Regards, Hans
