From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dave Young <hidave.darkstar@gmail.com>
Subject: Re: [BUG] kvm: guest can not startup due to triple fault
Date: Mon, 18 Oct 2010 21:45:08 +0800
Message-ID: <20101018134508.GA11885@darkstar>
References: <20101017085416.GA1758@darkstar>
 <4CBAC342.1010609@redhat.com>
 <AANLkTin6qJYEqOc_97EVWkK1Kt1zNSvXtfVeYuk9fyJ8@mail.gmail.com>
 <4CBAE8E2.1060704@redhat.com>
 <AANLkTi=5yGPmZxZY7T_oeyJ4xS+RWt7cY4WD=78fbo7v@mail.gmail.com>
 <4CBBF3C8.9070104@web.de>
 <4CBC1047.6010501@redhat.com>
 <20101018125803.GA2497@darkstar>
 <4CBC4B06.3030300@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Jan Kiszka <jan.kiszka@web.de>, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
To: Avi Kivity <avi@redhat.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <4CBC4B06.3030300@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On Mon, Oct 18, 2010 at 03:26:30PM +0200, Avi Kivity wrote:
>  On 10/18/2010 02:58 PM, Dave Young wrote:
> >>
> >>  It's secondary_startup_64 enabling efer.sce and efer.nx.
> >>
> >>  Dave, please post your /proc/cpuinfo.  Is your host running with NX
> >>  disabled?
> >
> >I see nx bit in /proc/cpuinfo, Actually I don't know how to disable it.
> 
> Strange.
> 
> Please patch arch/x86/kvm/x86.c to printk efer_reserved_bits (a
> global), efer (an argument) and old_efer (a local), and post the
> results.

I add printk before kvm_mmu_reset_context(vcpu), correct? get following value:

[ 3228.468325] efer_reserved_bits = 0xfffffffffffffafe
[ 3228.468328] efer = 0x100
[ 3228.468330] old_efer = 0x0