http://forums.w5j6stm77zs6652pgsij4awcjeel3eco7kvipheu6mtr623eyyehj4yd.onion/t/disabling-smt-in-security-misc-may-make-security-worse-on-some-power9-systems/100
If so, Intel/AMD x86 is already fine, as are POWER9 CPU’s with unpaired cores, but we will want to add a mitigation for POWER9 CPU’s with paired cores. The POWER9 paired core mitigation will impact performance by a factor of 2. Disabling SMT, as Kicksecure currently does, probably magnifies the risk without an additional mitigation.