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The kvmppc ultravisor code wants a device private memory pool that is system wide and not attached to a device. Instead of faking up one provide a low-level memremap_pages for it. Link: https://lore.kernel.org/r/20190818090557.17853-5-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Tested-by: Bharata B Rao <bharata@linux.ibm.com> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>