[Xen-devel] Questions about the new usb hotplug code in libxl and about adding hotplug (with qmp) usbredir tcp channels

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Hi, I took a look at the new pvusb hotplug code in libxl to try to add 
also hotplug (with qmp) usbredir tcp channels.
Adding usbredir tcp channels at domU start requires for example adding 
qemu parameters like these: "-chardev 
socket,id=charredir4,host=192.168.1.35,port=40000 -device 
usb-redir,chardev=charredir4,id=redir4".
It is possible to hotplug it with qmp using "chardev-add" and 
"device_add" commands.
Looking at old George Dunlap's patches I tested years ago 
(http://xenbits.xen.org/gitweb/?p=people/gdunlap/xen.git;a=commitdiff;h=f7a77843e3fcf070c72115be8ed349a3bfe34e60) 
I can understand what they do and I can add similar qmp functions for 
usbredir tcp too.
But now I see that bigger and different usb hotplug code was added, I 
looked at these patches:
http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=bf7628f087b212052a0e9f024044b2790c33f820
http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=043910384cb9ea2c781a7dceac238e110a559c10
and the full current code in xen's staging branch but I didn't find qmp 
commands for the qemu usb passthrough, I suppose it is missing or 
incomplete (though strange), am I wrong?
If that is correct, pvusb drivers are needed for both host and domU to 
have usb passthrough working but in new windows pv drivers, the pvusb 
one is missing, so without the "qemu emulated" usb passthrough it 
doesn't work at all in similar cases, right?
How do you think I should proceed to implement hotplug usbredir tcp 
channels in libxl?
Thanks for any reply and my bad English.



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