Re: "Force HWP min perf before offline" triggers unchecked MSR access errors

[Rafael J. Wysocki]

On Tue, Oct 29, 2019 at 9:55 PM Qian Cai <cai@xxxxxx> wrote:
>
> The commit af3b7379e2d7 ("cpufreq: intel_pstate: Force HWP min perf before
> offline") triggers an error below while doing CPU hotplug. Reverted it (on the
> top of the linux-next) fixed it.
>
> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config

The MSR_IA32_ENERGY_PERF_BIAS MSR appears to be not present, which
should be caught by the X86_FEATURE_EPB check in
intel_pstate_set_epb().

Do you run this in a guest perchance?