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Article ID: 2770440 - Last Review: January 11, 2013 - Revision: 1.0

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Symptoms

Consider the following scenario:
  • You have a Windows Server 2012-based computer that uses AMD processors.
  • You install a Hyper-V role on the computer.
  • You install the Remote Desktop Virtualization Host (RD Virtualization Host) role service on the computer.
  • You create one or more virtual machines on the computer.
  • You use the Microsoft RemoteFX feature to improve user experience in virtual machines.
In this scenario, graphics performance in the virtual machines is poor.

Cause

This issue occurs because Hypervisor incorrectly configures the Page Address Table (PAT) cache type for root partitions on AMD systems.

Resolution

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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
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.

Prerequisites

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 need to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2012 file information note
Important Windows Server 2012 updates are included in the same packages.
  • The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.2.920 0.20 xxxWindows Server 2012RTMLDR
  • The MANIFEST files (.manifest) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2012" section. MANIFEST files and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2012
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File nameFile versionFile sizeDateTimePlatform
Hvax64.exe6.2.9200.205391,117,41617-Oct-201206:12x64
Hvix64.exe6.2.9200.205391,133,80017-Oct-201206:12x64
Hvloader.efi6.2.9200.205391,084,13617-Oct-201206:12Not applicable
Hvloader.exe6.2.9200.20539998,12017-Oct-201206:12x64
Hvservice.sys6.2.9200.2053967,81617-Oct-201206:12x64
Kdhvcom.dll6.2.9200.2053919,68817-Oct-201206:12x64
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Status

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  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Server 2012

Additional files for all supported x64-based versions of Windows Server 2012
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Collapse this tableExpand this table
File nameAmd64_51f77cfef6e22d96c7f1da7a2fc8a8ce_31bf3856ad364e35_6.2.9200.20539_none_f1ee223ba17c2231.manifest
File versionNot applicable
File size710
Date (UTC)17-Oct-2012
Time (UTC)18:03
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.2.9200.20539_none_89dfaa85083a0d9d.manifest
File versionNot applicable
File size6,490
Date (UTC)17-Oct-2012
Time (UTC)06:29
PlatformNot applicable
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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.

Applies to
  • Windows Server 2012 Datacenter
  • Windows Server 2012 Essentials
  • Windows Server 2012 Foundation
  • Windows Server 2012 Standard
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2770440
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