On Tue, 26 Aug 2008, Avi Kivity wrote:

quoted text
> Most machines are recent machines.

 This is a bold statement I would say.  Any numbers to back it up?

quoted text
> If a machine doesn't have acpi, this change is safe.
> 
> If a machine has acpi, but doesn't have the reset register set in the 
> FADT, this change is safe.
> 
> If a machine has acpi, and the reset register is set incorrectly, this 
> change is safe.
> 
> 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.

 If a machine has ACPI and it is broken randomly, then the results can be
arbitrary.  Hopefully not destructively.  If even such a simple thing as
wiring the reset line so that it functions correctly can be got wrong,
more so can be more complex matters.

 Failing a better alternative, I suppose the change has to go in though.

  Maciej
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