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---Problem Description---
If I enable SRIOV in a Mellanox CX4 card while a PF interface is doing 
something like a ping flood. The PF interface will stop pinging. 
We found a small window were MMIO are bein g disabled during pci_enable_sriov 
is called. 
---uname output---
---Additional Hardware Info---
It needs a Mellanox CX4 SRIOV capable to recreate this issue 

Machine Type = P8 
---Steps to Reproduce---
 just configure the IP address of PF interface and start like a ping flood to 
that interface.
then do this echo to enable SRIOV on the PF. 
echo 8 > /sys/class/net/enP1p1s0f0/device/sriov_numvfs
Then you will notice the ping flood will stop. 
A patch that will fix this issue was sent for review:

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New

** Tags: architecture-ppc64le bugnameltc-146479 severity-high 
Ubuntu 16.10 KVM SRIOV: if enable sriov while ping flood is running ping will 
stop working
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