On Do, 2014-06-12 at 10:53 +0200, Michal Suchanek wrote: > Hello, > > I hit bug https://bugs.launchpad.net/qemu/+bug/685096 and found the > usb2.txt file in the source which is sadly not installed by the > distribution. > > What I would like is an -usb2 option which instantiates both uhci/ohci > and ehci root hubs. I don't particularly care if the buses appear as > companion or separate.
The -usb switch installs what the chipset has by default. On "pc" (piix4 southbridge) this is only uhci. On "q35" (ich9 southbridge) this actually is a uhci/ehci companion setup. > I would also want the -usbdevice host option to attach devices by bus > compatibility to either uhci or ehci. The compatibility level is > already examined in the libusb code so the information should be > available. Not needed. With the companion setup you'll have a usb bus which can handle both usb1 and usb2 devices. If the guest is new enough that it has drivers you can also simply use xhci. cheers, Gerd
