Xen users - May 2008 - System hang when booting Xen 3.2.1 with "vtd=1" option on HP xw4600

I''m currently doing some investigation on PCI-Passthrough into RHEL3
HVM
with VT-d. The workstation I choose to use is HP xw4600, which has Intel X38
Express chipset. In BIOS, the Intel I/O Virtualization option can be turned
on.

When booting Xen 3.2.1, with "vtd=1" option, the system will hang
after the
message "[Xen] Brought up 2 CPUs...", before booting the dom0 kernel.
And
after long time, a message shows saying "DMAR" related thing not
working. If
without "vtd=1" option, Xen will boot correctly, and PCI-Passthrough
to a
RHEL5 PVM is working fine.

Does anyone else also encounter similar problem? Is this a problem of BIOS
code or Xen bug?

Jimmy Jin


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