Description of problem:
win8.1-32 guest gui freeze after migration, but network works well.

Version-Release number of selected component (if applicable):

Host:
RHEL-7.0-20131127.1
qemu-img-1.5.3-21.el7.x86_64
qemu-kvm-common-rhev-1.5.3-21.el7.x86_64
qemu-kvm-rhev-debuginfo-1.5.3-21.el7.x86_64
qemu-kvm-rhev-1.5.3-21.el7.x86_64
kernel-3.10.0-57.el7.x86_64
virtio-win-1.6.7-2.el7.noarch

Guest:
win8.1-32

How reproducible:
100%

Steps to Reproduce:
1.Boot vm from src host with following cli:
#/usr/libexec/qemu-kvm \
-M pc \
-cpu SandyBridge \
-m 2G \
-smp 4,sockets=2,cores=2,threads=1,maxcpus=16 \
-enable-kvm \
-name win8-32 \
-uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \
-smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 \
-k en-us \
-rtc base=localtime,clock=host,driftfix=slew \
-nodefaults \
-monitor stdio \
-qmp tcp:0:6666,server,nowait \
-boot menu=on \
-bios /usr/share/seabios/bios.bin \
-drive file=/home/win8.1-32.qcow2,if=none,id=drive-data-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=pci.0,addr=0x7,scsi=off,drive=drive-data-disk,id=data-disk \
-drive file=/home/boot.iso,if=none,id=drive-ide0-0-1,media=cdrom,format=raw \
-device ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1 \
-device virtio-balloon-pci,bus=pci.0,id=balloon0 \
-netdev tap,id=hostnet0,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:01:01:ef \
-device piix3-usb-uhci,id=usb \
-device usb-tablet,id=input0 \
-device virtio-serial-pci,id=virtio-serial0,max_ports=16,vectors=0,bus=pci.0 \
-chardev socket,id=channel1,path=/tmp/helloworld1,server,nowait \
-device virtserialport,chardev=channel1,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port1 \
-vga cirrus \
-vnc :0 \

2.Do ping-pong migration between two hosts.
3.

Actual results:
after 1~2 times migration, guest will freeze, but ping guest got answer.

Expected results:
Guest works well.

Additional info: