QEMU/Devices/USB/Root

The following USB controller devices are provided. xHCI xHCI controllers can handle USB 1.0/2.0/3.0. name bus description nec-usb-xhci PCI qemu-xhci PCI EHCI EHCI controllers can only handle USB 2.0 (with a few exceptions not included by QEMU), so a companion controller is needed for USB 1.x. name bus description usb-ehci PCI ich9-usb-ehci1 PCI UHCI Intel and VIA controllers fall into this section. Other vendors tend to use OHCI. These controllers support USB 1.0 and are more software-intensive than their counterparts, thus less efficient at virtualization. name bus description ich9-usb-uhci1 PCI ich9-usb-uhci2 PCI ich9-usb-uhci3 PCI piix3-usb-uhci PCI piix4-usb-uhci PCI vt82c686b-usb-uhci PCI OHCI Controllers under this section support USB 1.1. name bus description sysbus-ohci System OHCI USB Controller pci-ohci PCI Apple USB Controller