After 
building Xen-3.2.1 I could successfully boot into it if I avoid giving vtd=1 as 
the boot parameter.
If I pass 
vtd=1 as the boot parameter to xen, the system hangs while 
booting.
The 
system hangs after the following messages
============================
Boot 
messages
[XEN]…..
[Xen] Brought up 2 
CPUs...
=========================
My 
chipset DQ35 series is having VT-d support and is enabled in the BIOS as 
well.
My 
domain0 is CentOS-5.2(2.6.18.8-xen).
Is this a 
possible bug or some thing else?? 
Any 
Idea??
Thx,
Venkat