Xen users - Sep 2011 - Can I specify a physical memory region for a domU

Hi,

I am porting our drivers to XEN''s PV domU (with PV PCI passthrouth), I
have to allocate a memory block and tell the hardware to access it.
But the hardware can address 32-bit only, so I want dedicate a region
of memory that below 2GB for the domU only.
How do that in XEN?

Thanks,
/Eric

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