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This code is preventing the MMU debug code from displaying virtual mappings of IO devices (anything that is not located in the RAM). Before this patch, Qemu would output 0xffffffffffffffff (-1) as the physical address corresponding to an IO device virtual address. With this patch the intended physical address is displayed. Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>