I have recently applied the latest patches on vSphere 6.0 version and after applying patches hosts was showing with warning message
” XXX esx.problem.hyperthreading.unmitigated.formatonhost not found XXX “ . This messages come after applying latest patches available in VMSA-2018-0020 to mitigate CVE-2018-3646 introduced a new notification to indicate the remediation status of the ‘L1 Terminal Fault’ (L1TF – VMM) vulnerability.
Note :- If you perform this you will loose the HT functionality , and suppress the warning is not recommended since your environment will vulnerable , VMware team is working on a solution to solve this issue . So before proceeding this update , please check your resources , security,requirement.
There are multiple option to resolve this using CLI , if you are not experienced with CLI part no worries it is very easy to perform form vSphere or WebClinet , using below steps
Using ESXCLI to Perform this Operation
#esxcli system settings kernel list -o hyperthreadingMitigation
This is Applicable for Below vSphere versions
Important Notes
Following list summarizes potential problem areas after enabling the ESXi Side-Channel-Aware Scheduler:
And this issue is still currently under investigation by VMware Engineers and Intel , and to fully utilize hypertrophying you will have to roll back at this moment .
Not advised to suppress the Warning since suppressing will make your environment vulnerable .
Reference – VMware KB
Reference – VMware KB
Reference – VMware Security Advisory
Reference – VMware KB
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