From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@web.de>
Subject: Re: __schedule #DF splat
Date: Sun, 29 Jun 2014 14:22:35 +0200
Message-ID: <53B0050B.90104@web.de>
References: <20140627115545.GC23153@pd.tnic> <53AD5D27.2090505@redhat.com> <20140627121053.GD23153@pd.tnic> <20140628114431.GB4373@pd.tnic> <20140629064626.GD18167@minantech.com> <53AFE2B3.5080300@web.de> <20140629102403.GE18167@minantech.com> <53AFEB16.5040608@web.de> <20140629105339.GF18167@minantech.com> <53AFF192.7020801@web.de> <20140629115143.GA4362@pd.tnic>
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Cc: Gleb Natapov <gleb@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	lkml <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Steven Rostedt <rostedt@goodmis.org>, x86-ml <x86@kernel.org>,
	kvm@vger.kernel.org, =?UTF-8?B?SsO2cmcgUsO2ZGVs?= <joro@8bytes.org>
To: Borislav Petkov <bp@alien8.de>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20140629115143.GA4362@pd.tnic>
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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.
>=20
> 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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