linux-kernel - Re: [BUG] kvm: guest can not startup due to triple fault

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Message-ID: <20101018135107.GA16154@darkstar>
Date:	Mon, 18 Oct 2010 21:51:08 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Jan Kiszka <jan.kiszka@....de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] kvm: guest can not startup due to triple fault

On Mon, Oct 18, 2010 at 03:46:17PM +0200, Avi Kivity wrote:
>  On 10/18/2010 03:45 PM, Dave Young wrote:
> >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:
> >
> 
> Add it at the beginning please, otherwise we'll miss the important
> one due to an early return.

here it is:

[ 3679.616500] efer_reserved_bits = 0xfffffffffffffafe
[ 3679.616504] efer = 0xd01
[ 3679.616506] old_efer = 0x500

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