You cannot use the Cisco SR-IOV network adapter on a virtual machine in Windows Server 2012

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Standard


Consider the following scenario:
  • You have the Cisco Single Root I/O Virtualization (SR-IOV) network adapter installed on a computer that is running Windows Server 2012.
  • You install the Hyper-V server role on the computer.
  • You restart or shutdown a virtual machine on the computer.
In this scenario, the Virtual Function (VF) driver that is running on the virtual machine does not receive the Virtual PCI (VPCI) backchannel notification. Therefore, the virtual machine can no longer use the Cisco SR-IOV network adapter. 


Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must be running Windows Server 2012.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Additional file information

Additional file information for Windows Server 2012

Additional files for all supported x64-based versions of Windows Server 2012
File nameAmd64_wvpcivsp.inf_31bf3856ad364e35_6.2.9200.20573_none_d81ee1d88274706d.manifest
File versionNot applicable
File size2,118
Date (UTC)01-Dec-2012
Time (UTC)06:37
PlatformNot applicable