[Qemu-devel] [Bug 1033727] Re: USB passthrough doesn't work anymore with qemu-kvm 1.1.1

[Michael Tokarev]

Ok.  I tried to bisect this, but it appears to be not so easy.  The
problem is that between 1.0 and 1.1, there's a lot of usb breakage, and
bisection leads to segfaults or assertion failures.


(qemu) usb_add host:003.002
usb_create: no bus specified, using "usb.0" for "usb-host"
(qemu) Segmentation fault

This is fixed in 8db36e9dddb1b6fab3554a8c00d92268b33a487b.


(qemu) usb_add host:003.002
(qemu) qemu-system-x86_64: /build/kvm/git/hw/usb.c:358: usb_packet_complete: 
Assertion `p->state == USB_PACKET_QUEUED' failed.


I skipped this commit, which lead to:


(qemu) usb_add host:003.002
(qemu) qemu-system-x86_64: /build/kvm/git/hw/usb.c:410: usb_packet_complete: 
Assertion `((&ep->queue)->tqh_first) == p' failed.


I'm continuing, but I've no much hope this will lead to anything useful at this 
rate.

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https://bugs.launchpad.net/bugs/1033727

Title:
  USB passthrough doesn't work anymore with qemu-kvm 1.1.1

Status in QEMU:
  New
Status in “qemu-kvm” package in Debian:
  Unknown

Bug description:
  Hi,

  I have a "Bus 006 Device 002: ID 0d46:3003 Kobil Systems GmbH mIDentity Light 
/ KAAN SIM III" (kind of smart card) in an USB port which I make available to a 
Windows XP guest.
  This worked fine with every older qemu-kvm version I've used so far.

  But since 1.1.0 it doesn't work anymore.
  The device shows up in the guest, but the software can't access it anymore 
(and the guest is pretty unresponsive).

  On the host I get every 2 seconds this message:
  [ 7719.239528] usb 6-1: reset full-speed USB device number 2 using uhci_hcd

  Command line options are:
  /usr/bin/kvm
  ...
  -device usb-host,vendorid=0x0d46,productid=0x3003,bus=usb.0,port=3
  ...

  When I switch back to qemu-kvm 1.0.1 everything works fine again.
  Any idea what the problem could be?

  Thanks
  Klaus

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