Re: [Xen-devel] [PATCH 2 of 2] xl: Accept a list for usbdevice in config file

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Nov 29, 2012 at 12:25:56PM +0000, Ian Campbell wrote:
> On Thu, 2012-11-29 at 12:20 +0000, George Dunlap wrote:
> > On Thu, Nov 29, 2012 at 11:44 AM, George Dunlap
> > <george.dunlap@xxxxxxxxxxxxx> wrote:
> >         qemu.git/vl.c suggests other options might include, "disk:",
> >         "serial:", "net:" and "bt:"; other non-colon-including options
> >         include "keyboard", "mouse", "wacom-tablet", and "braile".
> >         
> >         On the other hand, a number of these seem to require
> >         supplementary options to work well; e.g., network and bt
> >         (bluetooth) require one argument to hook up a USB device, and
> >         another option to say how it's connected to what.
> >         
> >         It's also interesting to note that the KVM documentation
> >         doesnt' mention using "-usb" and "-usbdevice" at all -- they
> >         seem to prefer using "-device" to specify hubs &c.
> > 
> > Speaking of which, the KVM docs refer to "-usb" and "-usbdevice" as
> > "legacy interfaces", which will only get you piix3.
> 
> This is a concern for other types of device too. We seem to invoke new
> qemu with a mixture of legacy and new-style interfaces.
> 
> >   It seems like exposing the full capabilities of qemu would mean
> > either 1) coming up with a full specifciation which we can then
> > translate into qemu directives, as libvirt seems to do, or 2) just
> > recommend people construct their own qemu command-line options to pass
> > through.
> 
> Does libvirt let you care about topologies or just it just automatically
> create a new USB controller for every N devices you add and hook things
> up in some order?
> 

Not sure about libvirt.. quick googling suggests that libvirt doesn't allow 
specifying the usb controller.

with qemu-kvm you can assign host usb devices to specific usb controllers
using the "bus=" option:
http://www.linux-kvm.com/content/qemu-kvm-11-adds-experimental-support-usb-30

qemu-kvm -device nec-usb-xhci,id=xhci -device 
usb-storage,bus=xhci.0,drive=usbstick


-- Pasi


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