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Subject: Re: perf hw  in kexeced kernel broken in tip
From: Peter Zijlstra <peterz@infradead.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>, Ingo Molnar <mingo@elte.hu>,
        Jason Wessel <jason.wessel@windriver.com>,
        Don Zickus <dzickus@redhat.com>,
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        Haren Myneni <hbabu@us.ibm.com>
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Date: Wed, 01 Dec 2010 20:38:12 +0100
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On Wed, 2010-12-01 at 11:23 -0500, Vivek Goyal wrote:
> > What does kexec normally do to ensure hardware is left in a sane state?
> 
> Typically calls device_shutdown() and sysdev_shutdown() from
> kernel_restart_prepare() to shutdown the devices.
> 
> Also calls machine_shutdown() which depending on architecture can take
> care of various things like stopping other cpus, shutting down LAPIC, 
> disabling IOAPIC, disabling hpet, shutting down IOMMU etc
> (native_machine_shutdown()). 

So basically there's no sane generic reset callout?