From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xensource.com>
Subject: Re: stopping APs during shutdown/reboot
Date: Wed, 11 Apr 2007 08:42:26 +0100
Message-ID: <C2424FF2.D202%keir@xensource.com>
References: <AEC554657A662A4880670EA30CB9488D0197F387@orsmsx412.amr.corp.intel.com>
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To: "Cihula, Joseph" <joseph.cihula@intel.com>, xen-devel@lists.xensource.com
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On 11/4/07 08:37, "Cihula, Joseph" <joseph.cihula@intel.com> wrote:

> machine_halt(), in xen/arch/x86/shutdown.c, uses
> smp_call_function(__machine_halt, NULL, 1, 0) to stop all APs.
> __machine_halt() is just an infinite for loop of __asm__ __volatile__ (
> "hlt" );
> 
> machine_restart(), also in shudown.c, uses smp_send_stop() which ends up
> doing the same thing with a few additional cleanup procedures.

Yes, shutdown is a fricking mess, especially after the kexec changes.
There's a fair bit of scope for cleanup.

 -- Keir