On Thu, May 30 2024 at 15:35, Thomas Gleixner wrote: > On Thu, May 30 2024 at 12:06, Peter Schneider wrote: > Now the million-dollar question is what unlocks CPUID to read the proper > value of EAX of leaf 0. All I could come up with is to sprinkle a dozen > of printks into that code. Updated debug patch below. Don't bother. Dave pointed out to me that this is unlocked in early_init_intel() via MSR_IA32_MISC_ENABLE_LIMIT_CPUID... Let me figure out how to fix that sanely. Thanks, tglx