Description of problem:
As subject.

Version-Release number of selected component (if applicable):
host info:
2.6.32-400.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.379.el6.x86_64
seabios-0.6.1.2-28.el6.x86_64
guest info:
2.6.32-400.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.boot guest with QMP server.
# /usr/libexec/qemu-kvm -S -M rhel6.5.0 -cpu SandyBridge -enable-kvm -m 4096 -smp 4,sockets=2,cores=2,threads=1 -no-kvm-pit-reinjection -name sluo -uuid 43425b70-86e5-4664-bf2c-3b76699b8bec -rtc base=localtime,clock=host,driftfix=slew -device virtio-serial-pci,id=virtio-serial0,max_ports=16,vectors=0,bus=pci.0,addr=0x3 -chardev socket,id=channel1,path=/tmp/helloworld1,server,nowait -device virtserialport,chardev=channel1,name=com.redhat.rhevm.vdsm.1,bus=virtio-serial0.0,id=port1,nr=1 -chardev socket,id=channel2,path=/tmp/helloworld2,server,nowait -device virtserialport,chardev=channel2,name=com.redhat.rhevm.vdsm.2,bus=virtio-serial0.0,id=port2,nr=2 -drive file=/home/RHEL6.5-20130721.n.0_6.5_Server_x86_64.qcow2,if=none,id=drive-system-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop,serial="QEMU-DISK1" -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-system-disk,id=system-disk,bootindex=1 -device virtio-balloon-pci,id=ballooning,bus=pci.0,addr=0x5 -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -netdev tap,id=hostnet0,vhost=off,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=2C:41:38:B6:40:21,bus=pci.0,addr=0x6,bootindex=2 -k en-us -boot menu=on -qmp tcp:0:4444,server,nowait -serial unix:/tmp/ttyS0,server,nowait -vnc :1 -spice port=5931,disable-ticketing -monitor stdio
2.do hotplug data disk with iops,iops_wr,iops_rd,bps,bps_wr,bps_rd inofs.
(qemu) ? __com.redhat_drive_add
__com.redhat_drive_add id=name,[file=file][,format=f][,media=d]... -- Create a drive similar to -device if=none.
(qemu) __com.redhat_drive_add file=/home/my-data-disk.qcow2,id=drive-data-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop,serial="QEMU-DISK2",bps=1000000,iops=10000
Invalid parameter 'iops'
(qemu) __com.redhat_drive_add file=/home/my-data-disk.qcow2,id=drive-data-disk,format=qcow2,bps=1000000,iops=10000
Invalid parameter 'iops'
(qemu) __com.redhat_drive_add file=/home/my-data-disk.qcow2,id=drive-data-disk,format=qcow2,bps=1000000
Invalid parameter 'bps'

{"execute":"qmp_capabilities"}
{"return": {}}
{"execute":"__com.redhat_drive_add","arguments":{"file":"/home/my-data-disk.qcow2","format":"qcow2","id":"drive-data-disk","bps":"1000000", "iops":"10000" }} 
{"error": {"class": "InvalidParameter", "desc": "Invalid parameter 'iops'", "data": {"name": "iops"}}}

Actual results:
after step 2, it fail to do hotplug.

Expected results:
It can do hotplug with qemu i/o throttling including iops,iops_wr,iops_rd,bps,bps_wr,bps_rd inofs successfully.

Additional info:
# /usr/libexec/qemu-kvm --help
...
-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]
       [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]
       [,cache=writethrough|writeback|none|unsafe][,format=f]
       [,serial=s][,addr=A][,id=name][,aio=threads|native]
       [,readonly=on|off][,copy-on-read=on|off]
       [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]][[,iops=i]|[[,iops_rd=r][,iops_wr=w]]
                use 'file' as a drive image