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--- Comment #2 from ---
The RDTSC/RDTSCP instructions are supported - is RDPMC really that much more

Would it be sufficient to pass the RDPMC instruction through to the physical
cpu, with the same ECX value? If that produces SIGILL (because PCE in CR4 is
off), kill the client program, otherwise return in EDX:EAX whatever the native
RDPMC returned. Event counts will be inflated, yes, but imo that is a
well-understood effect of running programs under Valgrind.

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