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Date:	Mon, 3 Nov 2008 11:04:59 +0100
From:	Ingo Molnar <>
To:	Avi Kivity <>
Cc:	Andrey Borzenkov <>,
	Avi Kivity <>,,
	Andrew Morton <>,
	"Rafael J. Wysocki" <>,
	Linux Kernel Mailing List <>,
	Eduardo Habkost <>,
	"Eric W. Biederman" <>
Subject: Re: [PATCH] Use BIOS reboot on Toshiba Portege 4000

* Avi Kivity <> wrote:

> Ingo Molnar wrote:
>>> Subject: [PATCH] Use BIOS reboot on Toshiba Portege 4000
>>> From: Andrey Borzenkov <>
>>> After commit c7ffa6c26277b403920e2255d10df849bd613380 which defaults
>>> to reboot via ACPI keyboard is dead on Toshiba Portege 4000 upon reboot.
>>> Power off is required to revive it again. Add DMI entry to force BIOS
>>> reboot method as it was before.
>>> Signed-off-by: Andrey Borzenkov <>
>> Avi, i expect more boxes to be affected by this bug, and the DMI  
>> solution just does not scale.
>> So could we please disable VMX from the emergency-shutdown code  
>> instead of twiddling with the reboot method?
>> Something like this might work as well: iff VMX is enabled, we just do  
>> smp_send_stop() (instead of skipping it) which should take care of  
>> this.
> There is already some code being worked on for kdump (which suffers 
> from the same symptoms), only kdump uses NMI IPIs for increased 
> stopping power.  Eduardo, can you take a look at porting it to 
> emergency reboot?

note that this is a must-have regression fix for v2.6.28.

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