linux-kernel - Re: [tip:perf/urgent] perf/x86/intel: Initialize TFA MSR

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Date:   Wed, 3 Apr 2019 08:23:52 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Thomas Gleixner <tglx@...utronix.de>
cc:     nelson.dsouza@...el.com, jolsa@...hat.com,
        linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
        peterz@...radead.org, vincent.weaver@...ne.edu, eranian@...gle.com,
        hpa@...or.com, mingo@...nel.org, torvalds@...ux-foundation.org,
        acme@...hat.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf/x86/intel: Initialize TFA MSR

On Wed, 3 Apr 2019, Thomas Gleixner wrote:

> On Wed, 3 Apr 2019, tip-bot for Peter Zijlstra wrote:
> 
> > Commit-ID:  d7262457e35dbe239659e62654e56f8ddb814bed
> > Gitweb:     https://git.kernel.org/tip/d7262457e35dbe239659e62654e56f8ddb814bed
> > Author:     Peter Zijlstra <peterz@...radead.org>
> > AuthorDate: Thu, 21 Mar 2019 13:38:49 +0100
> > Committer:  Ingo Molnar <mingo@...nel.org>
> > CommitDate: Wed, 3 Apr 2019 11:40:32 +0200
> > 
> > perf/x86/intel: Initialize TFA MSR
> > 
> > Stephane reported that the TFA MSR is not initialized by the kernel,
> > but the TFA bit could set by firmware or as a leftover from a kexec,
> > which makes the state inconsistent.
> > 
> > Reported-by: Stephane Eranian <eranian@...gle.com>
> > Tested-by: Nelson DSouza <nelson.dsouza@...el.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> > Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> > Cc: Jiri Olsa <jolsa@...hat.com>
> > Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Vince Weaver <vincent.weaver@...ne.edu>
> > Cc: tonyj@...e.com
> > Link: https://lkml.kernel.org/r/20190321123849.GN6521@hirez.programming.kicks-ass.net
> > Signed-off-by: Ingo Molnar <mingo@...nel.org>
> 
> This lacks:
> 
>  1) Fixes tag
> 
>  2) Cc: stable ....
> 
> Sigh.

It would also be nice to know what a "TFA" bit is without having to go 
find a copy of the Intel documentation.

Vince