From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@kernel.org>
Subject: Re: Hang on reboot in FreeBSD guest on Linux KVM host
Date: Tue, 17 Jun 2014 09:05:00 +0300
Message-ID: <20140617060500.GA20764@minantech.com>
References: <6DBD3DBB-24B1-4564-B524-E8E73508BBC5@jnielsen.net>
 <42870B81-CA29-4161-9BCE-F6D6020C3D2C@jnielsen.net>
 <539F1DC0.4020604@redhat.com>
 <4F14D859-D641-4AB5-B749-83D9D82F1DEA@jnielsen.net>
 <539FC243.2070906@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: John Nielsen <lists@jnielsen.net>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>
To: Paolo Bonzini <pbonzini@redhat.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mail-we0-f177.google.com ([74.125.82.177]:41265 "EHLO
	mail-we0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1755623AbaFQGFF (ORCPT <rfc822;kvm@vger.kernel.org>);
	Tue, 17 Jun 2014 02:05:05 -0400
Received: by mail-we0-f177.google.com with SMTP id u56so6541281wes.22
        for <kvm@vger.kernel.org>; Mon, 16 Jun 2014 23:05:04 -0700 (PDT)
Content-Disposition: inline
In-Reply-To: <539FC243.2070906@redhat.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On Tue, Jun 17, 2014 at 06:21:23AM +0200, Paolo Bonzini wrote:
> Il 16/06/2014 18:47, John Nielsen ha scritto:
> >On Jun 16, 2014, at 10:39 AM, Paolo Bonzini <pbonzini@redhat.com> wrote:
> >
> >>Il 16/06/2014 18:09, John Nielsen ha scritto:
> >>>>>The only substantial difference on the hardware side is the CPU.
> >>>>>The hosts where the problem occurs use "Intel(R) Xeon(R) CPU
> >>>>>E5-2650 v2 @ 2.60GHz", while the hosts that don't show the
> >>>>>problem use the prior revision, "Intel(R) Xeon(R) CPU E5-2650 0 @
> >>>>>2.00GHz".
> >>
> >>Can you do "grep . /sys/module/kvm_intel/parameters/*" on both hosts please?
> >
> >No differences that I can see. Output below.
> 
> Not really:
> 
> >Working host:
> >Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz
> ># grep . /sys/module/kvm_intel/parameters/*
> >/sys/module/kvm_intel/parameters/enable_apicv:N
> >
> >Problem host:
> >Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz
> ># grep . /sys/module/kvm_intel/parameters/*
> >/sys/module/kvm_intel/parameters/enable_apicv:Y
> 
> So we have a clue.  Let me study the code more, I'll try to get back with a
> suggestion.
> 
Does disabling apicv on E5-2650 v2 make reboot problem go away?

--
			Gleb.