[Spice-devel] spice-gtk usb-redirection

[Jackson]

In usbredir-0.4.3, there are two simple programs usbredirserver and 
usbredirtestclient. Usbredirserver creates a port and enters a usb vid:pid 
waiting for the connection of testclient. Usbredirtestclient enters the matching 
port and server to connect to the server.

In spice-gtk, how does the spicy(spice client) use usbredirection to communicate 
with VM(spice guest). Spicy works like usbredirserver, creating a port and 
waiting for connection of client? or spicy will ask for the connection actively?
Could someone tell me the usb redirection flow between spicy and QEMU?