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

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Message-ID: <20101018134508.GA11885@darkstar>
Date:	Mon, 18 Oct 2010 21:45:08 +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 03:26:30PM +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

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