Re: [RFC] nmi watchdog in kvm

[Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>]

* Balaji Rao <balajirrao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> I was trying to enable the use of nmi watchdog within a linux guest 
> running in kvm. I have done it by allowing direct access to perfmon 
> msrs using the MSR_BITMAP field in vmcs region.

your patch looks pretty clean and simple to me - and it would make quite 
a bit of sense from the "completeness of architecture" POV to inject 
NMIs into KVM - even though it's obviously not that hard to interrupt a 
KVM guest context via other means ;-)

at the least this would test the correctness of guest kernel NMI 
handling. We could even test things by injecting a very large stream of 
NMIs, which is not that easy on native hardware, etc.

( the emulation of "NMI reason" IO port could be accelerated too 
  perhaps, instead of passing it over to qemu. )

so it's a good idea IMO.

	Ingo

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