linux-kernel - Re: Machine reboot

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Message-ID: <20061005160518.GM2923@mail.muni.cz>
Date:	Thu, 5 Oct 2006 18:05:18 +0200
From:	Lukas Hejtmanek <xhejtman@...l.muni.cz>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Machine reboot

On Thu, Oct 05, 2006 at 08:58:22PM +0900, Magnus Damm wrote:
> A long shot, but switching to real mode does not work if the cpu is
> running in VMX root mode ie on hardware with Intel VT extensions
> enabled. So if you are using some kind of kernel virtualization module
> on rather new hardware, consider rmmod:ing the module before
> rebooting.
> 
> I'm about to post patches for kexec that fixes this problem, but I'm
> not sure about the current reboot status.

You are right, I'm using Intel Core 2 Duo processor with DP965LT board that is
capable of VT extensions. However, I'm using vanilla 2.6.18 kernel in X86_64,
no additional patches, nor XEN or VMWARE is running (even their modules are
not loaded). Moreover, SYSRQ-B (emergency reboot) works fine. System graceful
reboot does not work.

-- 
Lukáš Hejtmánek
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