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Message-ID: <20220712204830.kvblayj37s3udt4b@guptapa-desk>
Date: Tue, 12 Jul 2022 13:48:30 -0700
From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
To: Vince Weaver <vincent.weaver@...ne.edu>
Cc: "Liang, Kan" <kan.liang@...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, Jul 12, 2022 at 03:39:56PM -0400, Vince Weaver wrote:
>On Mon, 11 Jul 2022, Pawan Gupta wrote:
>
>> Output of below would be helpful:
>>
>> # grep "rtm\|hle" /proc/cpuinfo
>
>no results
>
>> ARCH_CAP
>> # rdmsr 0x10a
>
>rdmsr: CPU 0 cannot read MSR 0x0000010a
>
>> TSX_CTRL
>> # rdmsr 0x122
>
>rdmsr: CPU 0 cannot read MSR 0x00000122
>
>> MCU_OPT_CTRL
>> # rdmsr 0x123
>
>0
>
>> TSX_FORCE_ABORT
>> # rdmsr 0x10f
>
>rdmsr: CPU 0 cannot read MSR 0x0000010f
It appears this CPU does not support TSX feature (or disabling TSX). If
the bug is easy to reproduce, bisecting can help.
Thanks,
Pawan
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