Xen users - Feb 2012 - Charging for intergrating Xen-3.2.0 source code in commercial product?

Hi Everyone,
 
I compiled Xen-3.2.0 source code and setup it on CentOS in an appliance box. My
application sofware is running on three DomU. As far as I know, Xen follows GPL.
If I sell my software together with the whole appliance box as a server, need I
pay money for using Xen source code? I haven''t change any Xen source
code, just built it and using it.
Thanks in advance!
 
Regards,
Kevin H.

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