Re: [Xen-users] [XEN 3.3 - PCI passthrough] - interaction latencies with /dev/ttyUSB0

[Ken Cobler <kcobler@xxxxxxxxxxxxxx>]

Todd Deshane wrote:
> On Mon, Jan 12, 2009 at 8:16 AM, Ken Cobler <kcobler@xxxxxxxxxxxxxx> wrote:
>
>   
> > It would be great to see complete USB virtualization in Xen.
> > However, I don't think that would take away from PCI passthrough.  Simply,
> > there are other devices that are PCI devices and not USB, that could be
> > passed to a domU.
> >
> >     
> Maybe these links will help:
> http://www.virtuatopia.com/index.php/Adding_USB_Devices_to_a_Xen_HVM_domainU_Guest
> http://www.linux-kvm.com/content/virt-manager-and-usb-device-support
>
> Yes, the second one is based on KVM, but Xen HVM and KVM both use qemu
> behind the scenes.
>
> Cheers,
> Todd
>
>   
There's a limitation in QEMU for only 1 USB device to be passed 
(regardless of passing through vm config or to a running domU guest).  
If the domU is passed the usb tablet device to make smoother mouse 
support, than no other USB device can be passed.
Ken Cobler


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