>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?
I'm not sure which mode it has been. I've used the virt-manager to configure the device. A usb controller is already configured in mode 'default'. My steps on virt-manager: 1. add hardware 2. select usb host device 3. I can see my usb device, I select it 4. start guest and open Windows device manager I don't know is this UHCI or EHCI? On the usb host device list are some controller listed e.q. xhci, ehci and so on. Should I map these controller to Windows 7 as well? thanks, Jens