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

[Michael Tokarev]

Peter, are you able to run git bisect or something like that, to try to
pinpoint either the commit which introduced this issue or which fixed
it?

I tried to reproduce this issue several times with various devices, but
I can't do it reliable, it always more or less works on my machine.  If
I were able to, I'd bisect it long time ago.

Now, to clarify things, I've no idea how USB works internally and how it
is implemented in qemu, for this issue I can only do a bisection to find
the changes which change the issue.

You can ping me by email or hit me on IRC (I'm mjt at freenode.net and
oftc.net) if you're willing to debug it further and need help in doing
that.

Besides, what are the sympthoms of the device non-working?  Does it
happen with linux guest too?  Have you tried re-running the guest again
when the problem occur, using the same problematic version of qemu - I
mean, is it 100% reproducible or happens at random?

Thank you!

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

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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