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  1. OpenShift Virtualization
  2. CNV-77594

Enabling Windows Memory integrity degrades performance

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: Critical Critical
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    • CNV Virtualization
    • Quality / Stability / Reliability
    • 0.42
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      Description of problem:

      If a Windows guest is enabling Memory integrity, the performance is significantly decreased

      Version-Release number of selected component (if applicable):

      OpenShift Virtualization
4.21.0 provided by Red Hat

      How reproducible:

      100%

      Steps to Reproduce:

      1. Create a Windows 11 VM
2. Check guest CPU performance
3. In guest: Settings -> Privacy & Security -> Windows Security -> Core Isolation -> Enable Memory integrety
4. reboot the guest
3. Check guest CPU performance again

      Actual results:

      Enabeling Windows Memory integrity degrades performance significantly

      Expected results:

      Enabeling Windows Memory integrity degrades performance minimal

      Additional info:

      Might be related to CPU flags enabled to the guest, maybe ept_mode_based_exec . Other hypervisors does not show such a significant performance degradation when Memory integrity is enabled.

       

       

        1. 2026-01-21.log
          19 kB
          Dominik Holler
        2. Screencast From 2026-01-21 15-39-52.mp4
          5.02 MB
          Dominik Holler
        3. windows11-containerdisk.yml
          3 kB
          Dominik Holler

              tnisan@redhat.com Tal Nisan
              dholler@redhat.com Dominik Holler
              Kedar Bidarkar Kedar Bidarkar
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                Created:
                Updated: