Re: [Qemu-devel] [PATCH v3 1/4] cpus: Define NMI callback

[Paolo Bonzini]

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