Introduce wrapper functions to access phys_ram_dirty. Adds wrapper functions to prevent direct access to the phys_ram_dirty bitmap. Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp> Signed-off-by: OHMURA Kei <ohmura.kei@lab.ntt.co.jp> Reviewed-by: Avi Kivity <avi@redhat.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>