Comment 4 for bug 1120383

Another thing i want to mention about live block migration, though i don't know if this is really an issue of qemu or downstream libvirt.

When I was testing live migration of qemu-kvm-1.2.0 for long run, i found a problem that block data are not completed transferred to target host. I traced that and found block migration thinks migration is completed when "block_mig_state.submitted == 0", but actually in some cases, data are not really transferred yet.

I think the reasonable judgement for whether block migration is completed is "block_mig_state.submitted == 0 && block_mig_state.read_done == 0", that is all data have been transferred.

I don't see anything about this in block-migration-fixes-for-1.4. Maybe it has been addressed somewhere else, but if it is not, please consider this issue and make sure data is integrated during block migration.