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Type: Bug
Resolution: Unresolved
Priority: Critical
Fix Version/s: None
Affects Version/s: None
Component/s: CNV Virtualization
Labels:
- windows

Activity Type:
Quality / Stability / Reliability
Story Points:
0.42
Blocked:
False
Blocked Reason:

Hide

None

Show
None
Ready:
False
Epic Link:
better-vbs-performance
Component Fix Version(s):
None
Market:

Regression:
None

SFDC Cases Links:
SFDC Cases Open:
SFDC Cases Counter:

PX Impact Score:

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.