Comment by exrook

For anyone (understandably) confused about the attacks and mitigations related to L1TF, I've found the linux kernel documentation on the mitigations[0] to be a great resource.

One interesting thing is that to mitigate L1TF hyperthreads only need to be disabled if you are running VMs, the userspace mitigations are effective regardless of HT status. However, there's a catch, you can leave hyperthreading enabled if you disable the Extended/Nested Page Table virtualization feature. However it is noted that this will result in a significant performance impact.

[0] https://marc.info/?l=openbsd-cvs&m=152818076013158&w=2