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Use page directory based shared buffer implementation now available as common code for Xen frontend drivers. Remove flushing of shared buffer on page flip as this workaround needs a proper fix. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>