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Here is the list of required and optional post Windows 2008R2 SP1 hotfixes.

Please keep in mind that it all depends on which hardware and software combinations are used:

Note:  Windows Server 2008 R2 SP1 should be installed at a minimum plus the required hotfixes.

1              Windows & Hyper-V : Required Hotfixes

Validate SCSI Device Vital Product Data (VPD) test fails after you install Windows Server 2008 R2 SP1

http://support.microsoft.com/kb/2531907(required for 3+ node Hyper-V clusters)

The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1

http://support.microsoft.com/kb/2263829

The Cluster service stops unexpectedly on a Windows Server 2008 R2 failover cluster node when you perform multiple backup operations in parallel on a cluster shared volume

http://support.microsoft.com/kb/2494162(required for Veeam backup software)

MPIO failover fails on a computer that is running Windows Server 2008 R2

http://support.microsoft.com/kb/2460971

The MPIO driver fails over all paths incorrectly when a transient single failure occurs in Windows Server 2008 or in Windows Server 2008 R2

http://support.microsoft.com/kb/2522766

Performance decreases in Windows Server 2008 R2 when the Hyper-V role is installed on a computer that uses Intel Westmere or Sandy Bridge processors

http://support.microsoft.com/kb/2517329 (for example :  Intel Xeon 5600 series processors )

Stop error 0x0000007a occurs on a virtual machine that is running on a Windows Server 2008 R2-based failover cluster with a cluster shared volume, and the state of the CSV is switched to redirected access.

http://support.microsoft.com/kb/2494016 (required for Veeam backup software)

Optional Hotfixes

An update is available for Hyper-V Best Practices Analyzer for Windows Server 2008 R2

http://support.microsoft.com/kb/2485986

“0x0000009E” Stop error when you add an extra storage disk to a failover cluster in Windows Server 2008 R2

http://support.microsoft.com/kb/2520235

A virtual machine online backup fails in Windows Server 2008 R2 when the SAN policy is set to “Offline All”

http://support.microsoft.com/kb/2521348

Cluster node cannot rejoin the cluster after the node is restarted or removed from the cluster in Windows Server 2008 R2

http://support.microsoft.com/kb/2549472

Cluster service stops when an error occurs in the registry replication process of a failover cluster in Windows Server 2008 R2 or in Windows Server 2008

http://support.microsoft.com/kb/2496034

“0x20001” Stop error when you start a Linux VM in Windows Server 2008 R2 SP1

http://support.microsoft.com/kb/2550569

A heap memory leak occurs when an application or service queries the MSCluster_Resource WMI class in Windows Server 2008 R2

http://support.microsoft.com/kb/2580360

Cluster service initiates a failover after a delay of about 80 seconds when you shutdown the active node in Windows Server 2008 R2

http://support.microsoft.com/kb/2575625/en-us?sd=rss&spid=14134

New registration entries are added to the Persistent Reservation table when the physical disk resource that is associated with the CSV is taken offline on a Windows Server 2008 R2-based Failover Cluster

http://support.microsoft.com/kb/2579052/en-us?sd=rss&spid=14134

A transient communication failure causes a Windows Server 2008 R2 failover cluster to stop working

http://support.microsoft.com/kb/2550886

Cluster service leaks memory when the service handles state change notifications in Windows Server 2008 R2 or Windows Server 2008

http://support.microsoft.com/kb/2550894

Hyper-V Export function consumes all available memory in Windows Server 2008 or in Windows Server 2008 R2

http://support.microsoft.com/kb/2547551

Microcode update for Intel processors in Windows 7 or in Windows Server 2008 R2

http://support.microsoft.com/kb/2493989

Corrupted VSS snapshot

http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=975688&kbln=en-us

FIX: The guest operating system may crash (STOP 0xd) when you perform a live migration of Hyper-V virtual machines in a Windows Server 2008 R2 environment

http://support.microsoft.com/kb/2636573

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A BIG Thanks to Hans Vredevoort