[Qemu-devel] Migration of WinXP Guest -> usb+network failure

[Qemu-devel] Migration of WinXP Guest -> usb+network failure

[Peter Lieven]

Hi,

is there any known issue when migrating a WinXP SP3 guest with qemu-kvm 0.13.0 or qemu-kvm-0.12.5?

If I migrate such a guest with a Realtek rtl8139 Network Device and an USB Mouse Tablet 
after migration the USB Tablet doesn't work any more and network stalls. I have seen the mouse
moving a few seconds after migration and that stop moving.

If I go to hardware manager and disable + reenable USB Controller and Network Controller
it works perfectly again.

Command Line:
/usr/bin/qemu-kvm-0.13.0  -net tap,vlan=141,script=no,downscript=no,ifname=tap0 -net nic,vlan=141,model=rtl8139,macaddr=52:54:00:ff:00:93   -drive format=host_device,file=XXX,if=ide,boot=on,cache=none,aio=native  -m 1024 -monitor tcp:0:4001,server,nowait -vnc :1 -name 'winxp-test'  -boot order=c,menu=on  -k de  -incoming tcp:172.21.55.35:5001  -pidfile /var/run/qemu/vm-265.pid  -mem-path /hugepages -mem-prealloc  -rtc base=localtime,clock=vm -vga cirrus  -usb -usbdevice tablet  

Peter.

[Qemu-devel] Re: Migration of WinXP Guest -> usb+network failure

[Gerd Hoffmann]

On 02/08/11 14:32, Peter Lieven wrote:
> Hi,
>
> is there any known issue when migrating a WinXP SP3 guest with qemu-kvm 0.13.0 or qemu-kvm-0.12.5?
>
> If I migrate such a guest with a Realtek rtl8139 Network Device and an USB Mouse Tablet
> after migration the USB Tablet doesn't work any more and network stalls. I have seen the mouse
> moving a few seconds after migration and that stop moving.

usb devices simply don't have migration support.  The 0.14 release will 
add that for usb hid devices and the usb hub.

Whenever the devices work after migration depends on how the guest os 
handles usb errors.  Recent linux kernels just reset+reinitialize hid 
devices which fail, log a message about it and go on without a hitch. 
Other guests might be more sensitive, so this could be it, but maybe it 
isn't.

No idea on the rtl issue.

cheers,
   Gerd