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The objective is to test device migration mechanism in pages marked as
COW, for private and coherent device type. In case of writing to COW
private page(s), a page fault will migrate pages back to system memory
first. Then, these pages will be duplicated. In case of COW device
coherent type, pages are duplicated directly from device memory.
Link: https://lkml.kernel.org/r/20220715150521.18165-15-alex.sierra@amd.com
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
96c0657383