Symptoms
Consider the following scenario:
-
An AMD CPU that supports the Advanced Vector Extensions (AVX) feature is installed in a computer that is running Windows Server 2008 R2.Note AMD introduces support for the AVX feature in Bulldozer-based multicore processors.
-
You install the Hyper-V server role on the computer.
-
You create a virtual machine on the computer, and then you start the virtual machine.
In this scenario, AVX instructions do not work as expected on the virtual machine.
Cause
This issue occurs because the CPUID maximum function limit is not updated to reflect the support for the AVX feature on AMD processors.
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=supportNote 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 2008 R2 Service Pack 1 (SP1).For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2
Registry information
To apply this hotfix, 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.
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 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
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The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version
Product
Milestone
Service branch
6.1.760 1.17xxx
Windows Server 2008 R2
SP1
GDR
6.1.760 1.21xxx
Windows Server 2008 R2
SP1
LDR
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GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
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The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. 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 2008 R2
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
Hvax64.exe |
6.1.7601.17876 |
610,816 |
29-Jun-2012 |
04:00 |
|
Hvboot.sys |
6.1.7601.17876 |
118,128 |
29-Jun-2012 |
07:36 |
|
Hvix64.exe |
6.1.7601.17876 |
652,288 |
29-Jun-2012 |
04:00 |
|
Hvax64.exe |
6.1.7601.22034 |
607,232 |
29-Jun-2012 |
03:57 |
|
Hvboot.sys |
6.1.7601.22034 |
118,128 |
29-Jun-2012 |
07:36 |
|
Hvix64.exe |
6.1.7601.22034 |
635,392 |
29-Jun-2012 |
03:57 |
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:
824684Description of the standard terminology that is used to describe Microsoft software updates
Additional file information
Additional file information for Windows Server 2008 R2
Additional files for all supported x64-based versions of Windows Server 2008 R2
|
File name |
Amd64_1bd5b472e689c267836aa8c6e9e1126e_31bf3856ad364e35_6.1.7601.17876_none_8941729a232bef2a.manifest |
|
File version |
Not applicable |
|
File size |
710 |
|
Date (UTC) |
29-Jun-2012 |
|
Time (UTC) |
16:33 |
|
File name |
Amd64_283ed9894180910cde327c18e5e5c4a0_31bf3856ad364e35_6.1.7601.22034_none_bd200a603bccb6ee.manifest |
|
File version |
Not applicable |
|
File size |
710 |
|
Date (UTC) |
29-Jun-2012 |
|
Time (UTC) |
16:33 |
|
File name |
Amd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.1.7601.17876_none_8e387f8e7c53a3c1.manifest |
|
File version |
Not applicable |
|
File size |
4,163 |
|
Date (UTC) |
29-Jun-2012 |
|
Time (UTC) |
10:35 |
|
File name |
Amd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.1.7601.22034_none_8eeb33979552d45b.manifest |
|
File version |
Not applicable |
|
File size |
4,163 |
|
Date (UTC) |
29-Jun-2012 |
|
Time (UTC) |
10:38 |
