Benchmarking the Performance Impact to AMD Inception Mitigations

If there are a microcode update on zen 3 / zen 4, that means there's no way to turn the mitigations off, no?

I'd way ratehr have a fast computer than worry about processes side channeling each other. If I have malicious processes running at all, that's bad. I'm not relying on my OS to defend against hostile processes on the box.