Microsoft has released a KB article to confirm a problem where Hyper-V Manager incorrectly reports "Update required" for the Hyper-V integration services in Windows Server 2012 guest operating systems that use SR-IOV on Windows Server 2012 R2 Hyper-V hosts.
Symptoms
Assume that you have a Windows Server 2012 R2-based Hyper-V server. A Windows Server 2012-based guest operating system that has integration services up to date and that uses Single Root I/O Virtualization (SR-IOV) is running on the server. After you restart the guest operating system, Hyper-V Manager incorrectly reports the integration services state of the guest operating system as Update required.
Status
This is a known issue of Windows Server 2012 R2. Except for the status report, there are no negative effects to the Hyper-V system.
Microsoft has confirmed that this is a problem.
You can ignore this annoying warning. I suspect that if the warning status appears in VMM then it is really annoying. But very few of you should be affected because SR-IOV is not needed by many VMs.