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Date: Wed, 11 Jun 2014 10:37:29 +0200
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Subject: Re: [Qemu-devel] [PATCH v3 1/4] cpus: Define NMI callback
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To: Alexander Graf <agraf@suse.de>, Peter Maydell <peter.maydell@linaro.org>
Cc: Alex Bligh <alex@alex.org.uk>, Alexey Kardashevskiy <aik@ozlabs.ru>, QEMU Developers <qemu-devel@nongnu.org>, Markus Armbruster <armbru@redhat.com>, "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>, Stefan Hajnoczi <stefanha@redhat.com>, Cornelia Huck <cornelia.huck@de.ibm.com>, Luiz Capitulino <lcapitulino@redhat.com>, =?ISO-8859-1?Q?Andreas_F=E4r?= =?ISO-8859-1?Q?ber?= <afaerber@suse.de>, Richard Henderson <rth@twiddle.net>

Il 11/06/2014 10:29, Alexander Graf ha scritto:
>>
>> But right now inject-nmi was a CPU-specific interface and whoever
>> needs something different will have to find a way.
>>
>> You could argue that Alexey does need something different thanks to
>> his need to inject the NMI on all CPUs.
>>
>> What about an NMIMonitorHandler interface that takes a Monitor*, and
>> then you iterate on all of /machine looking for implementors of the
>> interface?  Then -M mac99 can add it to the MPIC, -M spapr can just
>> ignore the Monitor*, and i386/s390 can look at the current CPU.
>
> I think modeling a button is easier and closer to what you'd actually
> get on real hardware.

What is a button?  It certainly doesn't have any evdev support in Linux.

The NMI button is just something that closes a circuit.  Whoever is 
attached to that circuit reacts, in QEMU that's whoever implements an 
NMIMonitorHandler.  The Monitor* is just for backwards HMP compatibility.

Paolo