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Allow administrators to control whether Xen grant mappings for the virtio disk devices should be used. By default (when new parameter is not specified), the existing behavior is retained (we enable grants if backend-domid != 0). Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>