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Date: Wed, 04 Jun 2014 19:39:05 +1000
From: Alexey Kardashevskiy <aik@ozlabs.ru>
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Subject: Re: [Qemu-devel] [PATCH v3 0/4] cpus: Add generic NMI support
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Stefan Hajnoczi <stefanha@redhat.com>, QEMU Developers <qemu-devel@nongnu.org>, Markus Armbruster <armbru@redhat.com>, Alexander Graf <agraf@suse.de>, Luiz Capitulino <lcapitulino@redhat.com>, "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>, Alex Bligh <alex@alex.org.uk>, Cornelia Huck <cornelia.huck@de.ibm.com>, Paolo Bonzini <pbonzini@redhat.com>, =?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?= <afaerber@suse.de>, Richard Henderson <rth@twiddle.net>

On 06/04/2014 07:33 PM, Peter Maydell wrote:
> On 4 June 2014 10:30, Alexey Kardashevskiy <aik@ozlabs.ru> wrote:
>> On 06/04/2014 07:16 PM, Peter Maydell wrote:
>>> On 4 June 2014 09:08, Alexey Kardashevskiy <aik@ozlabs.ru> wrote:
>>>> This adds an NMI handler per CPUs. x86, s390 and ppc CPUS are supported.
>>>>
>>>> The change to existing behaviour is that x86 only delivers NMI to
>>>> the current monitored CPU now, not to every CPU.
>>>
>>> So this series means that the "nmi" command and handler does
>>>  * NMI on x86
>>>  * reset on PPC
>>
>> The vector is called "reset" but it is an interrupt, and I do not see any
>> way to mask it.
>>
>>>  * restart on S390
>>
>> The vector is called "restart" but it is still an interrupt.
> 
> So? ARM has an interrupt called "NMI" but there's zero reason
> you'd want to poke it from the monitor, any more than you'd
> want to try to hand-send any other kind of interrupt.
>
>>> That doesn't seem generic at all, and suggests this should
>>> not be a common CPU method/callback.
>>
>> Oh. Ok. Suggestions?
> 
> I dunno. What are you actually trying to achieve?


I personally want to get XMON (in-kernel debugger) on PPC.



-- 
Alexey