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Date:   Sat, 9 Sep 2017 16:43:50 +0200
From:   Markus Trippelsdorf <markus@...ppelsdorf.de>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g.
 perf

On 2017.09.09 at 16:33 +0200, Borislav Petkov wrote:
> On Sat, Sep 09, 2017 at 04:20:14PM +0200, Markus Trippelsdorf wrote:
> > > # rdmsr -a 0x00000410
> > 
> > 3fffffff
> > 0
> > 0
> > 0
> 
> WTF?! Those should be equal on every CPU. Yikes, we need to pay
> attention to those... Grrr.
> 
> # wrmsr -a 0x00000410 0x3ffffbff
> 
> should fix your issue.

No, it doesn't work:

x4 ~ # rdmsr -a 0x00000410
3fffffff                                    
0                                           
0                                           
0                                           
x4 ~ # wrmsr -a 0x00000410 0x3ffffbff
x4 ~ # rdmsr -a 0x00000410
3ffffbff                                    
0                                           
0                                           
0 

-- 
Markus

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