If I recall it correctly, when Spectre/Meltdown mitigations were released, they were applied (to Intel CPU's at the very least) as microcode updates. What exac

If I recall it correctly, when Spectre/Meltdown mitigations were released, they were applied (to Intel CPU's at the very least) as microcode updates. What exactly comprises the Intel CPU microcode is somewhat of a mystery, but I also remember somebody tearing apart the blob with the Spectre or Meltdown mitigation and posting the findings (a guesswork, in fact) of what was in there. The microcode was very low level, and it was not very comprehensible to me.