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Date: Fri, 22 Apr 2016 11:32:06 +0100
From: joe@thunderbug.co.uk
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Message-ID: <112a7dea40cb0418cae47e4172f6913f@thunderbug.co.uk>
Subject: Re: [Qemu-devel] Bug (Regression?) in hw/usb/hcd-uhci.c causes
 failure of ICH9 host controller and attached Xbox 360 Wireless Receiver
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: qemu-devel@nongnu.org, Qemu-devel <qemu-devel-bounces+joe=thunderbug.co.uk@nongnu.org>

On 2016-04-22 11:04, Gerd Hoffmann wrote:
> Hi,
> 
>> Starting the guest VM with the UHCI debug patch and the device 
>> unplugged
>> results in these two lines just after it starts:
>> 
>> uhci_handle_td: invalid pid token 0x0, raising HCPERR
>> uhci_handle_td: invalid pid token 0x0, raising HCPERR
>> 
>> and then the same line repeated 18 times once the Windows desktop is
>> reached and the device is plugged in.
> 
> Think I've nailed it.  Can you fetch the latest version of the git
> branch (fyi: it's rebased) and try again?
> 
> thanks,
>   Gerd

Yep, you nailed it!

I've applied 
https://www.kraxel.org/cgit/qemu/commit/?h=work/usb-uhci-usb-host-debug&id=c69e5efac15db4340b880c80f27ebe536acd1aeb 
to my local copy of current qemu git master and the problem no longer 
exists.

The stderr debugging output is also beautifully silent :)

Awesome work, many thanks.

Joe