It is doable if the hardware supports it well. Especially with virtual machines. However it is expensive to implement and thus even high end consumer mainboards

It is doable if the hardware supports it well. Especially with virtual machines. However it is expensive to implement and thus even high end consumer mainboards have problems today. (try passing through a GPU) And unless you have multiple CPUs or can ensure the cores do not interact in unexpected ways, you essentially have to accept the cost, remain vulnerable (and eat the worms) or replace the hardware with something fixed.