Hi, On Mon, Sep 07, 2020 at 12:46:35PM +0200, Jason A. Donenfeld wrote: > Are you sure that intel-undervolt using OC_MAILBOX from userspace is > actually a "misuse"? Should the kernel or kernel drivers actually be > involved with the task of underclocking? This seems pretty squarely in > the realm of "hobbyists poking and prodding at their CPUs" rather than > something made for a kernel driver, right?
The only thing I'm sure is that *if* it makes sense for any driver to control something in the hardware over MSRs, it should *not* poke at naked MSRs but use a proper interface. I'd leave it to the people who actually need this interface, to explain why they do. > Also, what was the justification for whitelisting > MSR_IA32_ENERGY_PERF_BIAS? That's: tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c Once that thing gets converted to a proper interface too, that MSR goes off the allowlist too. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette