[Qemu-devel] [Bug 924943] Re: usb-host devices given by command line are routed incomplete to the guest

[Erik Rull]

update:
it works with the following parameter set:
-usb -device usb-host
but then only USB 1.1 is available (very slow)

it does not work with:
-readconfig ich9-ehci-uhci.cfg -device usb-host,bus=ehci.0
but there I have USB 2.0 and USB 1.1 devices routed perfectly with a good speed 
to the guest at runtime

the .cfg is taken from the docs/ directory
I also tested with ehci-only parameters (no uhci / companion), same effect

And: This seems only to be related to USB 2.0 devices!
I tested both with a USB 1.1 device plugged in before starting the guest and 
there it works perfectly.

it would be really great to find a solution for that

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https://bugs.launchpad.net/bugs/924943

Title:
  usb-host devices given by command line are routed incomplete to the
  guest

Status in QEMU:
  New

Bug description:
  affected qemus: qemu-1.0, qemu-kvm-1.0, qemu and qemu-kvm master branches 
(older versions not tested)
  affected guests: linux, windows
  test hardware: standard usb key (or any other piece of USB hardware) that 
works perfectly when plugged in after guest bootup

  Several Sequences have been tested:
  - start qemu with  -readconfig /etc/ich9-ehci-uhci.cfg -device usb-tablet 
-device usb-host,bus=ehci.0
  - start qemu with -readconfig /etc/ich9-ehci-uhci.cfg -device usb-tablet -S 
(to not start up the guest directly) + at the console prompt: "device_add 
usb-host" then "c" to start the guest.

  For the linux guest, I get a usb device listed and detected as /dev/sdb when 
plugging it in at runtime. At startup linux does NOT detect it.
  For the windows guest, I get a usb device listed and detected as "removable 
media" when plugging it in at runtime. At startup Windows does detect 
"something" that is listed in the device manager as Generic Mass Storage 
device, but with a yellow exclamation mark and there is no removable media 
listed in Explorer

  If you need further testings, just let me know.

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