Crossed the Qubicon :-)

[apparatus]

@solene

SMT can be enabled, the security incidence of SMT depends on your threat model. My opinion on this is that most people should be able to use SMT safely. However it is disabled by default and if you enable it, it is disabled regularly at each kernel update…

Quick Quality-of-Life Improvements

If you are running your system with SMT enabled, you need to add the following lines to /etc/default/grub GRUB_CMDLINE_XEN_DEFAULT="$GRUB_CMDLINE_XEN_DEFAULT smt=off" GRUB_CMDLINE_XEN_DEFAULT="$GRUB_CMDLINE_XEN_DEFAULT smt=on" It’s the only way to keep kernel updates from disabling smt, by automatically adding the smt=off line to the end of the file.