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

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Message-ID: <20080826095032.GA309@elf.ucw.cz>
Date:	Tue, 26 Aug 2008 11:50:32 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Avi Kivity <avi@...ranet.com>
Cc:	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

On Mon 2008-08-25 13:11:27, Avi Kivity wrote:
> Triple-fault and keyboard reset may assert INIT instead of RESET; however
> INIT is blocked when Intel VT is enabled.  This leads to a partially reset
> machine when invoking emergency_restart via sysrq-b: the processor is still
> working but other parts of the system are dead.
> 
> Default to rebooting via ACPI, which correctly asserts RESET and reboots the
> machine.
> 
> This is safe since we will fall back to keyboard reset and triple fault if
> acpi is not enabled or if the reset is not successful.
> 
> Signed-off-by: Avi Kivity <avi@...ranet.com>

"ACPI" and "safe" in one sentence. /me bets this will break lot of
machines.

What about only doing that when enabling VT?
								Pavel

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