Microsoft listed the recommended hotfixes for Windows Server 2012 R2 Hyper-V environment on some KBs. These hotfixes are related to Hyper-V, Failover Clustering and Hyper-V Network Virtualization on Windows Server 2012 R2. These hotfixes aren't downloaded from Windows Update of Windows Server 2012 R2. Administrators have to request and download it manually. However, some hotfixes may not be suitable for your Hyper-V hosts because some features that you don't implement. Please go to the following web sites to check what you need and then apply it to your Hyper-V hosts. And, these hotfixes are updated irregularly.
Recommended hotfixes, updates, and known solutions for Windows Server 2012 R2 Hyper-V environments
Recommended hotfixed and updates for Windows Server 2012 R2-based failover clusters
Recommended hotfixes, updates, and known solutions for Windows Server 2012 R2 Hyper-V Network Virtualization (HNV) environments
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