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by andikleen2
460 days ago
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This technique works with any instruction that clobbers a register, not just with CPUID. In the worst case you could just single step the other CPUs until you hit an instruction that overwrites a register too. These are common. In my case (for a custom hypervisor for a sadly cancelled project) it wasn't a problem because the hypervisor quit itself in early guest boot, which is single CPU only. |
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