linux-kernel - Re: [PATCH] Use BIOS reboot on Toshiba Portege 4000

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Date:	Mon, 3 Nov 2008 11:04:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>
Cc:	Andrey Borzenkov <arvidjaar@...l.ru>,
	Avi Kivity <avi@...ranet.com>, mingo@...hat.com,
	Andrew Morton <akpm@...l.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Eduardo Habkost <ehabkost@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] Use BIOS reboot on Toshiba Portege 4000


* Avi Kivity <avi@...hat.com> wrote:

> Ingo Molnar wrote:
>>> Subject: [PATCH] Use BIOS reboot on Toshiba Portege 4000
>>>
>>> From: Andrey Borzenkov <arvidjaar@...l.ru>
>>>
>>> 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 <arvidjaar@...l.ru>
>>>     
>>
>> 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.

	Ingo
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