Abstract: A USB port shared control method executed by a hypervisor controlling port sharing among virtual machines and having a physical USB host controller including a physical register, the virtual machines each including a virtual USB host controller having a virtual register. The method includes performing sharing by: selectively allocating the physical register to the virtual register of a subject virtual USB host controller provided in a subject virtual machine of the plurality of virtual machines to occupy and unitize the USB port by the subject virtual machine, and directly reading or writing of the physical register by the subject virtual machine via the subject virtual USB host controller, to thereby allow the subject virtual USB host controller to directly control the physical USB host controller. More particularly, the allocating, reading and writing are switched from subject virtual machine to subject virtual machines to facilitate sharing.

Abstract: Virtual USB host controllers are arranged in a plurality of virtual machines constructed inside a physical machine; emulation of the unmounting and mounting of a USB device in a used physical USB port and modifications in the allocation of the USB port utilization rights of a virtual machine are carried out by means of an operation from a control terminal to make possible exclusive utilization; and the physical USB port is utilized jointly among the virtual machines.