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I see, so we probably shouldn't remove the rev check completely but just permit to reload if the rev is equal? > > > if cpu_rev is > patch_rev, clearly its ahead?. say BIOS has a newer > > version than in the initrd image, do we want to replace the BIOS > > version since we do no revid checks here. > > Can you even downgrade the microcode through the MSR? I'm not sure what is true for AMD. For Intel's there is a Security Version Number in the signed encrypted part of the microcode. As long as the new image has SVN >= what the CPU's SVN is you can update the microcode. So if a rev2 is loaded, and rev1 is the new MCU, and rev2 and rev1 have the same SVN, you can go down rev from rev2->rev1 where rev2 > rev1. Microcode enforcement for rollback protection has been the SVN. Version number is a SW feel good thing to identifying which image you are running, not intended for preventing rollback or any security enforcement. Cheers, Ashok