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Date:   Tue, 12 Jul 2022 13:48:30 -0700
From:   Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
To:     Vince Weaver <vincent.weaver@maine.edu>
Cc:     "Liang, Kan" <kan.liang@linux.intel.com>,
        linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>
Subject: Re: [perf] unchecked MSR access error: WRMSR to 0x689 in
 intel_pmu_lbr_restore
Message-ID: <20220712204830.kvblayj37s3udt4b@guptapa-desk>
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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