Xen devel - Apr 2008 - [PATCH 0/2] Share VT-d code between x86 and IA64

iommu code has been moved to arch-generic locations. This patch set
modifies VT-d code for sharing between x86 and IA64. Arch-dependent
functions are declared in common header files, and need to be
implemented respectively for different architectures. In addition,
allocate VT-d page table pgd, root_entry, iremap and qinval from domheap
rather than xenheap. 

The patches are as follows:

Patch 1: declare arch-dependent functions in vtd.h, and implement them
for x86 arch. 
Patch 2: allocate VT-d page table pgd, root_entry, iremap and qinval
from domheap rather than xenheap, and get rid of structure page_info in
iommu.c.

Signed-off-by: Weidong Han <weidong.han@intel.com>

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