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FYI,
Re-tested this bug with the latest qemu(qemu-kvm-1.5.3-60.el7.x86_64) and kernel(3.10.0-119.el7.x86_64)
Result:
1. migration is completed from RHEL7.0 to RHEL6.5(different from comment 0)
2. Guest black screen in des host(via vnc or spicec)
3. Guest console don't output any message
4. In des host
(qemu) info status
VM status: running
Anyway, Guest haven't any response in des host.