s390/pci: use virtual memory for iommu bitmap
The bitmap used to mark dma mappings can be quite large on systems with huge amounts of memory. Use virtual memory for this bitmap. Suggested-by: NAlexander Schmidt <alexschm@de.ibm.com> Reviewed-by: NGerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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