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Description of problem:
qemu-kvm-rhev-2.1.2-1 couldn't support memory hot-plug with command: 
(qemu)object_add memory-backend-ram,id=mem1,size=1G
(qemu)device_add pc-dimm,id=dimm1,memdev=mem1
then get error message as follows:
 'DIMM property node has value 0' which exceeds the number of numa nodes: 0
  Device 'pc-dimm' could not be initialized

But it is successful inside qemu-kvm-rhev-2.1.0-4


Version-Release number of selected component (if applicable):
inside host:
    rpm -qa|grep qemu
    qemu-kvm-rhev-2.1.2-1.el7.x86_64
    uname -r
    3.10.0-184.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.boot qemu with command:
/usr/libexec/qemu-kvm -name RHEL-Server-7.0-64 -m 4G,slots=4,maxmem=8G -smp 4,cores=2,threads=2,sockets=1,maxcpus=160 -monitor stdio

2.do memory hot-plug inside qemu:
(qemu)object_add memory-backend-ram,id=mem1,size=1G
(qemu)device_add pc-dimm,id=dimm1,memdev=mem1


Actual results:
wouldn't do memory hot-plug and get error message like this:
 'DIMM property node has value 0' which exceeds the number of numa nodes: 0
  Device 'pc-dimm' could not be initialized


Expected results:
do memory hot-plug successfully and there is no error message

Additional info:

*** This bug has been marked as a duplicate of bug 1163735 ***

I've tried to find this one first but failed, so I created a new one for patch submission.

Update this bz as current release according to comment7.