[Qemu-devel] [Bug 685096] Re: USB Passthrough not working for Windows 7 guest

[Serge Hallyn]

Upstream git head still gives me this problem, as does back to 0.14.0.

Note however that the same qemu builds, with the same usb stick, work
fine using a linux guest.

The same stick, inserted to the same windows version on native hardware
also works.

So it's not bad hardware, it's not hardware unsupported by windows, and
qemu *is* passing the usb device through sufficiently that windows
SHOULD be able to make use of it.

So this appears to be something specific that windows wants.

I've seen mention of windows registry tricks involving removal of top
and bottom filters for the device...  I haven't tested that to see if
that would be a workaround.

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https://bugs.launchpad.net/bugs/685096

Title:
  USB Passthrough not working for Windows 7 guest

Status in QEMU:
  Confirmed
Status in “qemu-kvm” package in Ubuntu:
  Confirmed

Bug description:
  USB Passthrough from host to guest is not working for a 32-bit Windows
  7 guest, while it works perfectly for a 32-bit Windows XP guest.

  The device appears in the device manager of Windows 7, but with "Error
  code 10: device cannot start". I have tried this with numerous USB
  thumbdrives and a USB wireless NIC, all with the same result. The
  device name and functionality is recognized, so at least some USB
  negotiation is taking place.

  I am trying this with the latest git-pull of QEMU-KVM.

  The command line to launch qemu-kvm for win7 is:
  sudo /home/user/local_install/bin/qemu-system-x86_64 -cpu core2duo -m 1024 
-smp 2 -vga std -hda ./disk_images/win7.qcow -vnc :1 -boot c -usb -usbdevice 
tablet -usbdevice host:0781:5150

  The command line to launch qemu-kvm for winxp is:
  sudo /home/user/local_install/bin/qemu-system-x86_64 -cpu core2duo -m 1024 
-smp 2 -usb -vga std -hda ./winxpsp3.qcow -vnc :0 -boot c -usbdevice tablet 
-usbdevice host:0781:5150

  Any help is appreciated.

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