linux-kernel - Re: __schedule #DF splat

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Message-ID: <53B0050B.90104@web.de>
Date:	Sun, 29 Jun 2014 14:22:35 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	Borislav Petkov <bp@...en8.de>
CC:	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>, x86-ml <x86@...nel.org>,
	kvm@...r.kernel.org, Jörg Rödel <joro@...tes.org>
Subject: Re: __schedule #DF splat

On 2014-06-29 13:51, Borislav Petkov wrote:
> On Sun, Jun 29, 2014 at 12:59:30PM +0200, Jan Kiszka wrote:
>> Will see what I can do regarding bisecting. That host is a bit slow
>> (netbook), so it may take a while. Boris will probably beat me in
>> this.
> 
> Nah, I was about to instrument kvm_multiple_exception() first and am
> slow anyway so... :-)

OK, looks like I won ;): The issue was apparently introduced with "KVM:
x86: get CPL from SS.DPL" (ae9fedc793). Maybe we are not properly saving
or restoring this state on SVM since then.

Need a break, will look into details later.

Jan



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