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In a linux part an ioctl(gntdev, IOCTL_GNTDEV_GRANT_COPY, ..) system call is invoked. In mini-os the operation is yet not implemented. For the OSs that does not implement gnttab the call of the grant copy operation causes abort. Signed-off-by: Paulina Szubarczyk <paulinaszubarczyk@gmail.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> [ wei: modify this patch to use BUILD_BUG_ON in xen-tools/libs.h ] Signed-off-by: Wei Liu <wei.liu2@citrix.com>