This blog post is not about the L1 Terminal Fault (L1TF -> VMware KB56931) but about the HTAware Mitigation tool version 126.96.36.199 (HTAwareMitigation-188.8.131.52.zip) that seems to have issues when used on single hosts (instead of clusters) – here is the problem that I have observed.
You run the command:
Set-HTAwareMitigationConfig -VMhostName <hostname> -Enable
Get-HTAwareMitigationConfig -VMhostName <hostname>
As you might see the “Set-HTAwareMitigationConfig -VMhostname <hostname>” command doesn’t seem to do anything!
Therefore, at this moment a quick fix could be setting the value manually under the host advanced settings:
VMkernel.Boot.HyperthreadingMitigation = true
After that the Get-HTAwareMitigationConfig can be used to confirm the setting
So all there is left now to do: reboot!
This settings could be done by various scripting tools – but if you only have a few host the manually way might be the fastest way to go 🙂
Feel free to provide your own fix in the comments section bellow!