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

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Wed, Jun 18, 2014 at 7:00 AM,  <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.
>
> With Xen 4.3 its Cirrus (unprogrammed) identity would not show up when
> passed thru to an HVM, but after it got its firmware its new identity
> (Anchor) would pass thru, and worked fine.  With Xen 4.4 its
> unprogrammed and programmed  identities no longer pass through.  The
> error in dmesg is not helpful.  I'll follow up with that tomorrow.
>
> I know that this is a special case, but there are alot of these
> programmable bridges out there for various functions.  And actually,
> with Xen 4.4 I am not able to pass through -any- of my USB devices
> anymore.  The mouse, keyboard, Canon scanner, sd card reader, all fail
> to show in the HVM domU.  PCI forwarding dom0's USB hub is not an option
> as there is only one hub for the whole machine that handles all 14
> ports.

You haven't provided nearly enough information here.  It's not clear
whether you're talking about PCI pass-through of the controller itself
or emulated USB pass-through.  There's no dmesg / xl dmesg / serial
output.  There's no guest configs or information about guest kernels.

Without more information I'm afraid there's not much to go on.

 -George

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