xen/blkback: Utilize the M2P override mechanism for GNTMAP_host_map
Instead of doing copy grants lets do mapping grants using
the M2P(and P2M) override mechanism.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Conflicts:
drivers/xen/blkback/blkback.c
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