linux-kernel - Re: [perf] unchecked MSR access error: WRMSR to 0x689 in intel_pmu_lbr

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Date:   Thu, 14 Jul 2022 12:12:42 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
cc:     Vince Weaver <vincent.weaver@...ne.edu>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [perf] unchecked MSR access error: WRMSR to 0x689 in
 intel_pmu_lbr_restore

On Tue, 12 Jul 2022, Liang, Kan wrote:

> 
> Could you please apply the below patch, reboot to the patched kernel and
> share the dmesg log?

here's the info with your patch applied:

[    0.000000] microcode: microcode updated early to revision 0x28, date = 2019-11-12
...
[    1.460296] NO HLE NO RTM. LBR has tsx 0
[    1.468217] Haswell events, 16-deep LBR, full-width counters, Intel PMU driver.
[    1.472292] ... version:                3
[    1.476275] ... bit width:              48
[    1.480275] ... generic registers:      4
[    1.484276] ... value mask:             0000ffffffffffff
[    1.488277] ... max period:             00007fffffffffff
[    1.492277] ... fixed-purpose events:   3
[    1.496271] ... event mask:             000000070000000f

Vince