From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH] x86: default to reboot via ACPI
Date: Tue, 26 Aug 2008 14:31:22 +0200
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Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Pavel Machek <pavel@suse.cz>,
	Ingo Molnar <mingo@elte.hu>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org
To: Avi Kivity <avi@qumranet.com>
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In-Reply-To: <48B3F3A9.8030709@qumranet.com> (Avi Kivity's message of "Tue, 26 Aug 2008 15:14:33 +0300")
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Avi Kivity <avi@qumranet.com> writes:
>
> If a machine has acpi, and the reset register is wired to the launch
> controller, then perhaps this change is unsafe.  Don't issue sysrq-b
> on such machines.

Even if it's wired to the launch controller the launch controller
would need to be quite quick to do something before the following
triple fault/keyboard reset->PCI reset stops it again.

-Andi