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Intel Virtualization Technology Directed i/o (VTd)

    Question

  • Hi,

    Running SRV2008 Hyper-V R2 and I enabled "Data Execution Prevention" and "Intel Virtualization Technology (VTx)". Hyper-V runs as expected. In the BIOS I saw this option "Intel Virtualization Technology Directed I/O (VTd)": should I enable this option for Hyper-V?

    Thx,

    Dirk

    Tuesday, September 14, 2010 7:45 AM

Answers

  • Hyper-V does not take advantage of VTd today, so there is no need to enable it in the BIOS.
     

    Cheers,
    Benjamin Armstrong
    ============================
    Windows Virtualization
    Senior Lead Program Manager

    This posting is provided AS IS with no warranties, and confers no rights. You assume all risk for your use.
    • Marked as answer by Dirk10 Wednesday, September 15, 2010 6:23 AM
    Wednesday, September 15, 2010 3:19 AM

All replies

  • Hi,

     

    If your Hyper-V is running properly with current options, you can ignore other options in BIOS. Base on my experience, other options may cause some expected behavior on Hyper-V.

     

     

    Best Regards,

    Vincent Hu

     

    Tuesday, September 14, 2010 8:20 AM
  • Intel’s hardware assist for virtualization helps to lower the overhead of virtualization software. Intel VT (introduced first in 2005) today represents a platform centric innovation in hardware assist encompassing Intel VT-x in the processor, Intel VT for Directed I/O (VT-d) for I/O virtualization in chipset and Intel VT for Connectivity (VT-c) in the networking devices, all of which help VMs reduce the virtualization software overhead across the platform and increase the performance.

    Guest Post: Intel Inside for Hyper-V Virtualization
    http://blogs.technet.com/b/virtualization/archive/2008/10/28/guest-post_3a00_-intel-inside-for-hyper_2d00_v-virtualization.aspx

    to get more info
    Intel® Virtualization Technology (Intel® VT) for Directed I/O (Intel® VT-d) Architecture Specification

    Tuesday, September 14, 2010 8:38 AM
  • Hyper-V does not take advantage of VTd today, so there is no need to enable it in the BIOS.
     

    Cheers,
    Benjamin Armstrong
    ============================
    Windows Virtualization
    Senior Lead Program Manager

    This posting is provided AS IS with no warranties, and confers no rights. You assume all risk for your use.
    • Marked as answer by Dirk10 Wednesday, September 15, 2010 6:23 AM
    Wednesday, September 15, 2010 3:19 AM
  • Hyper-V does not take advantage of VTd today, so there is no need to enable it in the BIOS.

    I know, it's quite an old post, but will Hyper-V 3 / Server 2012 support VTd? And if so: From what version on, meanging Standard, Enterprise, DataCenter?

    Thanks for an answer.

    Best Regard,

    Thorsten Franzke

    Tuesday, June 05, 2012 7:23 AM
  • Yes, Windows Server 2012 Hyper-V does support VT-d as well as SR-IOV.

    Saturday, December 29, 2012 12:51 AM