Description of problem:
When doing live migration with ovs+dpdk, "info migrate" shows wrong 'total time' and 'downtime' info.

For example, the migration finished in 20 seconds, however, "total time: 11005066 milliseconds  downtime: 0 milliseconds" is wrongly showed.


Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.6.0-28.el7.x86_64
libvirt-2.0.0-10.el7.x86_64
3.10.0-514.el7.x86_64
(dpdk and ovs is upstream)
dpdk-16.07.zip
openvswitch-2.6.0.tar.gz


How reproducible:
Sometimes, about 50%


Steps to Reproduce:
1. Start ovs-dpdk in host1 and host2
# ovs-vsctl show
ad29bee3-1cc7-4cc8-893e-206cd3add181
    Bridge "ovsbr1"
        Port "vhost-user2"
            Interface "vhost-user2"
                type: dpdkvhostuser
        Port "dpdk1"
            Interface "dpdk1"
                type: dpdk
        Port "ovsbr1"
            Interface "ovsbr1"
                type: internal
    Bridge "ovsbr0"
        Port "vhost-user1"
            Interface "vhost-user1"
                type: dpdkvhostuser
        Port "dpdk0"
            Interface "dpdk0"
                type: dpdk
        Port "ovsbr0"
            Interface "ovsbr0"
                type: internal


2. Boot guest with vhostuser in host1
    <interface type='vhostuser'>
      <mac address='18:66:da:e6:02:02'/>
      <source type='unix' path='/usr/local/var/run/openvswitch/vhost-user1' mode='client'/>
      <model type='virtio'/>
      <driver name='vhost'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </interface>
    <interface type='vhostuser'>
      <mac address='18:66:da:e6:02:03'/>
      <source type='unix' path='/usr/local/var/run/openvswitch/vhost-user2' mode='client'/>
      <model type='virtio'/>
      <driver name='vhost'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </interface>

3. Migrate guest from host1 to host2
# virsh migrate --live $guest_name qemu+ssh://$des_ip/system

4. Check migration info, occasionally wrong migration is showed. (In this example, the migration is finished in 1 minutes, but it shows 102 minutes)
# virsh qemu-monitor-command $guest_name --hmp "info migrate"
capabilities: xbzrle: off rdma-pin-all: off auto-converge: off zero-blocks: off compress: off events: on postcopy-ram: off 
Migration status: completed
total time: 6160317 milliseconds
downtime: 0 milliseconds
setup: 36 milliseconds
transferred ram: 578347 kbytes
throughput: 938.65 mbps
remaining ram: 0 kbytes
total ram: 8389896 kbytes
duplicate: 1957490 pages
skipped: 0 pages
normal: 140012 pages
normal bytes: 560048 kbytes
dirty sync count: 3


Actual results:
"info migrate" shows wrong info.


Expected results:
"info migrate" should show correct time info.


Additional info:
1. I need to highlight this, ovs and dpdk are upstream version. So QE is not sure which component this bug should be, please change it if it's not qemu bug.

2. Both rhel7.3 and rhel7.3 kvm-rt hit this issue.