Hi.

Roberto Pereyra wrote:
> -  I need always a linux host for boot DOM0 ? If it's true, why ? 

It's true. Why? Because nobody has ported Xen (as host) to other systems 
yet.
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html#SECTION02210000000000000000

> -  I can use a NetBSD host for do it ?

No.
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html#SECTION02210000000000000000

> - I can use only NetBSD for use Xen in DOM0 and the others domains ?

Not only.
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/faq.html#a1.3


RTFM :-)

Felix