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

[Peter Schaefer]

Hello Michael,

Am 1/12/2013 1:24 PM, Michael Tokarev wrote:

> 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?

Well, i'm no expert at git, but i made some progress, see below.

> 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?

In my case it's the SmartCard-Reader that's not working, i.e. the DATEV 
Software called "Sicherheitspaket" does not 
work. The background process called "SiPaHost.exe" just hangs; any client 
program trying to display SmartCard 
information does also just hang forever. That behaviour is 100% reproducible 
and persists over reboots of the Linux host 
and/or the Windows guest (Windows XP SP3). I did not try Linux guests.

Yesterday, i used git to checkout all qemu-kvm versions from kernel.org and 
build Debian packets from it (source kept 
vanilla, i just applied the two patches that rename paths from 'qemuXXX' to 
'kvmXXX').

The findings were:

- v1.0   -> ok
- v1.0.1 -> ok
- v1.1.0 -> not ok
- v1.1.1 -> not ok
- v1.1.2 -> not ok
- v1.2.0 -> not ok

So far, this is consistent with the findings in this bug report.

BUT: The latest HEAD from kernel.org (called "v1.2.50") also does work
again!

So, i'm now learning about git bisect (however, today i won't have time
for this).

Regards,
Peter

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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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