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

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Message-Id: <A94C23C3-E6B9-4390-B380-C49D87731D81@lca.pw>
Date:   Tue, 29 Oct 2019 18:01:30 -0400
From:   Qian Cai <cai@....pw>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Chen Yu <yu.c.chen@...el.com>, Len Brown <lenb@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: "Force HWP min perf before offline" triggers unchecked MSR access errors



> On Oct 29, 2019, at 5:47 PM, Rafael J. Wysocki <rafael@...nel.org> wrote:
> 
> 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?

No, it is a baremetal HPE server. The dmesg does say something like energy perf bias changed from performance to normal, and the cpuflag contains epb which I thought that would pass the feature check? I could upload the whole dmesg a bit later if that helps.