linux-kernel - Re: [PATCH] x86: default to reboot via ACPI

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Message-ID: <87tzd8rm91.fsf@basil.nowhere.org>
Date:	Tue, 26 Aug 2008 14:31:22 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Pavel Machek <pavel@...e.cz>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] x86: default to reboot via ACPI

Avi Kivity <avi@...ranet.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
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