linux-kernel - Re: [PATCH 1/8] perf/x86/intel: Fix memory corruption

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Message-ID: <20190321200700.GD2490@worktop.programming.kicks-ass.net>
Date:   Thu, 21 Mar 2019 21:07:00 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "DSouza, Nelson" <nelson.dsouza@...el.com>
Cc:     Tony Jones <tonyj@...e.com>, Thomas Gleixner <tglx@...utronix.de>,
        Stephane Eranian <eranian@...gle.com>,
        Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/8] perf/x86/intel: Fix memory corruption

On Thu, Mar 21, 2019 at 07:47:50PM +0000, DSouza, Nelson wrote:
> Is the request to check whether the msr gets reset to default upon reboot of the machine ?

basically:

 - apply patch
 - start workload with 4 counter (on all CPUs), such that tfa-msr=1
 - try the following:
   o cpu hotplug
   o kexec

to see if the new WARN will trigger -- it should not.