other: 0.954
assembly: 0.952
semantic: 0.951
graphic: 0.951
instruction: 0.943
device: 0.936
mistranslation: 0.931
socket: 0.898
boot: 0.868
network: 0.858
vnc: 0.853
KVM: 0.847

K800 keyboard no longer works when attached to a VM

I use Logitech K800 keyboard which is connected to a PC through Logitech unifying receiver. In order to control my windows VM i attach unifying receiver USB device to a VM using "virsh attach-device VM-Name ./device.xml". Device ID as seen in lsusb is 046d:c52b.

As of v4.1.0 keyboard no longer works when attached to a windows VM. When attached receiver is still at least partially functional. Logitech pairing utility properly displays paired keyboard, pressing buttons on the keyboard shows changing indicator icon in pairing utility. Pairing and unpairing works. Pressing keys however fails to register any key presses.

Downgrading to v4.0.0 fixes the issue.

device.xml used to attach USB device:
```
<hostdev mode='subsystem' type='usb'>
        <source>
                <vendor id='0x046d'/>
                <product id='0xc52b'/>
        </source>
</hostdev>

```



There are only two pass-through changes:

commit bfe44898848614cfcb3a269bc965afbe1f0f331c
commit 65f14ab98da1da920f98ee8734dc1588b01d6b2b

Can you check whenever reverting the one or the other or both restores 4.0 behavior?

Can you add "lsusb -v" output for the device in question to the bug?

Reverting 65f14ab98da1da920f98ee8734dc1588b01d6b2b fixes the issue.

lsusb -v:
Bus 002 Device 008: ID 046d:c52b Logitech, Inc. Unifying Receiver
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x046d Logitech, Inc.
  idProduct          0xc52b Unifying Receiver
  bcdDevice           12.08
  iManufacturer           1 
  iProduct                2 
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0054
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          4 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower               98mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      59
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               8
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      2 Mouse
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     148
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               2
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      93
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0020  1x 32 bytes
        bInterval               2

https://patchwork.ozlabs.org/patch/1176777/

Could you please clarify how this config is supposed to be used? I would test your patch.

qemu: -device usb-host,...,guest-resets-all=true

libvirt:

   <qemu:arg value='-set'/>
   <qemu:arg value='device.hostdev0.guest-resets-all=true'/>

... assuming this is is the only pass-through device.

If you pass through more devices you''l have hostdev0, hostdev1, ... and have to pick the correct one.

(see also http://blog.vmsplice.net/2011/04/how-to-pass-qemu-command-line-options.html)

I am bit slow to test, but i just realized that i am still not sure how to test this. My devices are attached using "virsh attach" after system has started. So it seems to me there is no way to test it with libvirt. A global option to restore old behavior would be useful until libvirt starts supporting this option.

Patch has been included here:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=1dfe2b91dcb1633d0ba450
... and been released with QEMU v4.2

Any way to get old behavior back when using `virsh attach` command? Devices are not attached on boot. I am stuck with qemu 4.0 because of this.

Try this:

   <qemu:arg value='-global'/>
   <qemu:arg value='usb-host.guest-resets-all=true'/>

Not fully sure this works for hotplugged devices though.


It works with virsh device-attach. Thank you very much.