Re: [Qemu-devel] [PATCH] usb-host: insert usb device into hostdevs to be scaned

[gerd hoffmann]

  Hi,

> > We don't copy any state.  It is rather pointless, even for save/resume on 
> > the
> > same machine we don't know what state the usb device has and whenever it is
> > still in the state the guest has left it.
> I have tried stop/cont a vm with host-usb device during coping large 
> files(makes usb device busy woking), 
> but usb device was not detached/attached and coping task was completed 
> properly.
>  It seems that we can restart it where we left it off.

stop/cont isn't a problem.

save/resume means "virsh save" + "virsh resume".  This sends the live
migration stream to a file (using "migrate exec:cat>file" monitor
command for save, then 'qemu -incoming "exec:cat file' for resume).

cheers,
  Gerd