linux-kernel - Re: [RFC] perf/x86/intel: Disable check

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Message-ID: <20190624183806.GD31027@tassilo.jf.intel.com>
Date:   Mon, 24 Jun 2019 11:38:06 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...el.com>, Jiri Olsa <jolsa@...nel.org>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tom Vaden <tom.vaden@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Alok Kataria <akataria@...are.com>
Subject: Re: [RFC] perf/x86/intel: Disable check_msr for real hw

> Tom, plz correctme if I'm wrongm but AFAIK because the LBR tracing is
> enabled during the boot the lbr_from/lbr_to registers will fail the
> check_msr 'val_new != val_tmp' check

Ok this should be handleable. It should be enough to check
the ctrl register, if that working likely we don't need
to check the data registers which might be changing.

-Andi