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Re: [Xen-devel] Bug: USB Bridge Will Not PassThru

On Wed, Jun 18, 2014 at 06:45:35AM -0700, merc1984@xxxxxx wrote:
>    On Tue, Jun 17, 2014, at 23:48, Pasi Kärkkäinen wrote:
>      On Tue, Jun 17, 2014 at 11:00:31PM -0700, [1]merc1984@xxxxxx wrote:
>        I have a device which is a programmable bridge by Cirrus
>        Semiconductor.
>        It converts parallel TTL to USB2.  I've built udev rules to upload its
>        firmware when detected (by VID/PID), and to set the permissions and a
>        systemd alias of its new identity after the firmware is loaded.
>        ...
>      Are you using qemu-traditional or qemu-upstream for this HVM guest?
>      Note that qemu-traditional only supports USB 1.1 emulated passthru,
>      while qemu-upstream also supports USB2 and USB3.
>    Using qemu-xen-traditional, as I must have VGA passthrough.  This USB
>    bridge is a USB2 device and must work at those speeds.  Is this going to
>    be possible?
>    More info in my next email.

USB2 is not possible with qemu-traditional.

You've have to use PVUSB, which has USB2 support, if you have the drivers.

-- Pasi

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