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If we receive a file descriptor that points to a regular file, there's nothing stopping us from doing multifd migration with mapped-ram to that file. Enable the fd: URI to work with multifd + mapped-ram. Note that the fds passed into multifd are duplicated because we want to avoid cross-thread effects when doing cleanup (i.e. close(fd)). The original fd doesn't need to be duplicated because monitor_get_fd() transfers ownership to the caller. Signed-off-by: Fabiano Rosas <farosas@suse.de> Reviewed-by: Peter Xu <peterx@redhat.com> Link: https://lore.kernel.org/r/20240229153017.2221-23-farosas@suse.de Signed-off-by: Peter Xu <peterx@redhat.com>