linux-kernel - Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf

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Date:   Sat, 9 Sep 2017 18:32:25 +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 16:43 +0200, Markus Trippelsdorf wrote:
> 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 

Also tried the following patch. It does not help.

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 3b413065c613..9ee1edb0929f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1580,7 +1580,7 @@ static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
 
 	/* This should be disabled by the BIOS, but isn't always */
 	if (c->x86_vendor == X86_VENDOR_AMD) {
-		if (c->x86 == 15 && cfg->banks > 4) {
+		if ((c->x86 == 15 || c->x86 == 16) && cfg->banks > 4) {
 			/*
 			 * disable GART TBL walk error reporting, which
 			 * trips off incorrectly with the IOMMU & 3ware

-- 
Markus