RHEV: Failed to hot add memory to VM: unsupported configuration: maxMemory has to be specified when using memory devices

Issue

• Hot adding memory to a VM fails
• Following error is seen in RHEV-M

Failed to hot set memory to VM.  Underlying error message:  unsupported configuration:  maxMemory has to be specified when using memory devices.

• The following error is seen in /var/log/ovirt-engine/engine.log

ERROR [org.ovirt.engine.core.vdsbroker.SetAmountOfMemoryVDSCommand] (ajp-/127.0.0.1:8702-9) [161411d1] Command 'SetAmountOfMemoryVDSCommand(HostName = <HOST NAME>, Params:{runAsync='true', hostId='<HOST ID>', vmId='< VM ID>', memoryDevice='VmDevice:{id='VmDeviceId:{deviceId='<DEVICE ID>', vmId='<VM ID>}', device='memory', type='MEMORY', bootOrder='0', specParams='[node=0, size=8192]', address='', managed='true', plugged='true', readOnly='false', deviceAlias='', customProperties='null', snapshotId='null', logicalName='null', usingScsiReservation='false'}'})' execution failed: VDSGenericException: VDSErrorException: Failed to SetAmountOfMemoryVDS, error = unsupported configuration: maxMemory has to be specified when using memory devices , code = 70