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From:   "DSouza, Nelson" <nelson.dsouza@intel.com>
To:     Peter Zijlstra <peterz@infradead.org>
CC:     Tony Jones <tonyj@suse.com>, Thomas Gleixner <tglx@linutronix.de>,
        Stephane Eranian <eranian@google.com>,
        Ingo Molnar <mingo@kernel.org>, "Jiri Olsa" <jolsa@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 1/8] perf/x86/intel: Fix memory corruption
Thread-Topic: [PATCH 1/8] perf/x86/intel: Fix memory corruption
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Date:   Thu, 21 Mar 2019 23:16:17 +0000
Message-ID: <BC9B17E68BB84346BEE0B491BDB7D8AE28A6A801@ORSMSX101.amr.corp.intel.com>
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Attached cpu hotplug test output while perf is running in the background. N=
o WARN messages seen.

When I run the kexec command, it boots to bios. Haven't used kexec before. =
Still trying to figure that one out.

-----Original Message-----
From: Peter Zijlstra [mailto:peterz@infradead.org]=20
Sent: Thursday, March 21, 2019 1:07 PM
To: DSouza, Nelson <nelson.dsouza@intel.com>
Cc: Tony Jones <tonyj@suse.com>; Thomas Gleixner <tglx@linutronix.de>; Step=
hane Eranian <eranian@google.com>; Ingo Molnar <mingo@kernel.org>; Jiri Ols=
a <jolsa@redhat.com>; LKML <linux-kernel@vger.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=3D1
 - try the following:
   o cpu hotplug
   o kexec

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

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	modification-date="Thu, 21 Mar 2019 21:02:48 GMT"
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