Re: [Qemu-devel] USB Passthrough not working for Windows 7 guest

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2013-11-05 17:01, Frederich, Jens wrote:
> Hi all,
> 
> we're currently evaluating different RTOS systems (Windows CE, Intime, RTX, etc.).
> One system is Linux RT + KVM/QEMU with a Windows 7 guest. Up to now all
> works fine, Linux RT has good latency and KVM/Qemu setup was easy. But one QEMU bug
> breaks my measurement setup and evaluation.
> 
> I've some usb devices for the Windows 7 guest. I configure them as USB passthrough.
> The devices appears in the device manager of Windows 7, but with
> "Error code 10": device cannot start". The Windows driver fails on USB set configuration.
> The driver creates a IRP and send it via IOCTRL to lower layer. The IOCTRL fails with
> invalid parameter.
> 
> driver log:
> 00000009	0.65470564	vnCDrvUsbControlRequestSetConfiguration, WdfUsbTargetDeviceSelectConfig single interface failed 0xc000000d	
> 00000010	0.65472370	vnCDrvUsbIFPrepareHardwareState, vnCDrvUsbControlRequestSetConfiguration failed: 0xc000000d	
> 00000011	0.65473646	vnCDrvDevConPrepareHardware, vnCDrvUsbIFPrepareHardwareState failed 0xc000000d	
> 00000012	0.65474838	vnCDrvEvtDevicePrepareHardware, vnCDrvDevConPrepareHardware failed 0xc0000001	
> 00000013	0.6547
> 
> This bug breaks my latency measurement setup and Linux RT is out of the evaluationg
> race. Windows CE should not win :-), it there anyway workaround or hack to fix the issue?

Workaround: Pass-through one of the (typically) many USB host
controllers to the Windows guest (vfio or classic pci-assign). I did
this back then when *HCI emulation was still pretty immature.

But USB device pass-through should also work. Do you happen to pass a
USB 2.0 device via an emulated UHCI? Or are you already using the EHCI
emulation? In the latter case, activating USB tracing (see also
qemu/docs/tracing.txt) and posting the results here may help analysing
the issue.

Jan

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