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We can detect disk migration in migrate_prepare, if disk migration is enabled in COLO mode, we can directly report an error.and there is no need to disable block migration at every checkpoint. Signed-off-by: Lei Rao <lei.rao@intel.com> Signed-off-by: Zhang Chen <chen.zhang@intel.com> Reviewed-by: Li Zhijian <lizhijian@fujitsu.com> Reviewed-by: Zhang Chen <chen.zhang@intel.com> Reviewed-by: Lukas Straub <lukasstraub2@web.de> Tested-by: Lukas Straub <lukasstraub2@web.de> Signed-off-by: Jason Wang <jasowang@redhat.com>