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This is because it should only contain real I/O memory address ranges, otherwise we can get false conflicts between a real I/O range and a 'pseudophysical' RAM range, causing drivers to fail to work in a domU. Also prevent kernel code/data being requested as iomem resources -- they are not contiguous in 'io memory' space so this would not make sense. Signed-off-by: Keir Fraser <keir@xensource.com>