Re: [Qemu-devel] [PATCH] usb-hid: activate usb tablet / mouse after migration.

[Peter Lieven]

On 21.10.2011 11:22, Gerd Hoffmann wrote:
>    Hi,
>
> > Original:
> > * Mouse #1: QEMU HID Tablet (absolute)
> >    Mouse #0: QEMU PS/2 Mouse
> >
> > Start from the snapshot:
> > * Mouse #0: QEMU PS/2 Mouse
> >    Mouse #1: QEMU HID Tablet (absolute)
> >
> > The active mouse device is not be saved into the snapshot.
> That shouldn't hurt though.  When the guest polls the tablet the first
> time after starting from snapshot should activate it.  In case it the
> guest doesn't pull because the guest activated remote wakeup and
> suspended the device we now (with the patch) activate it too.
>
> It also doesn't reproduce here.  /me wonders what is going on ...
>
> What does 'info usb' print before and after snapshotting?
> Can you also post the full qemu command line?
I see the same issue here, but not in my case it happens when migrating 
a VM.

Before migration:

(qemu) info usb
info usb
  Device 0.1, Port 1, Speed 12 Mb/s, Product QEMU USB Tablet
(qemu) info mice
info mice
  Mouse #0: QEMU PS/2 Mouse
* Mouse #1: QEMU HID Tablet (absolute)

After migration:
(qemu) info usb
info usb
  Device 0.1, Port 1, Speed 12 Mb/s, Product QEMU USB Tablet
(qemu) info mice
info mice
  Mouse #1: QEMU HID Tablet (absolute)
* Mouse #0: QEMU PS/2 Mouse

It seems the USB Tablet is not activated again. I can get it working by 
manually aktivating and deactivating the USB Hub in Windows Device Manager.

The guest is Windows7 32-bit.

cmdline:
/usr/bin/qemu-kvm-1.0 -net 
tap,vlan=141,script=no,downscript=no,ifname=tap0 -net 
nic,vlan=141,model=e1000,macaddr=52:54:00:ff:00:d3 -drive 
format=host_device,file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-eeef4e007-a8a9f3818674f2fc-lieven-windows7-r80788,if=virtio,cache=writethrough,aio=native 
-m 2048 -monitor tcp:0:4001,server,nowait -vnc :1 -name lieven-win7 
-boot order=dc,menu=off -k de -pidfile /var/run/qemu/vm-187.pid -rtc 
base=localtime -vga std -usb -usbdevice tablet -cpu host

Thanks,
Peter
> thanks,
>    Gerd