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? My setup: Ubuntu 64-bit Windows 7 Embedded Guest Linux Kernel: 3.10.10-rt7 QEMU: 1.4.0, 1.6.1 thanks, Jens