State of NMI support

State of NMI support

[Jan Kiszka]

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Hi,

I saw kvm-userspace recently merged qemu's new CPU_INTERRUPT_NMI
support. But the required infrastructure to use this in kvm mode is not
yet visible. Is anyone working on this? Sheng? IIRC, you once said to
work on it.

Currently I just need the basic mechanism for injecting NMIs into the
guest (from special hardware emulation), no full support for in-kernel
[A]PICs. But before starting some quick&dirty hack, I would like to know
if someone already has a patch pending and is able to share even just
preliminary results.

Thanks,
Jan


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Re: State of NMI support

[Yang, Sheng]

On Friday 25 April 2008 08:33:04 Jan Kiszka wrote:
> Hi,
>
> I saw kvm-userspace recently merged qemu's new CPU_INTERRUPT_NMI
> support. But the required infrastructure to use this in kvm mode is not
> yet visible. Is anyone working on this? Sheng? IIRC, you once said to
> work on it.
>
> Currently I just need the basic mechanism for injecting NMIs into the
> guest (from special hardware emulation), no full support for in-kernel
> [A]PICs. But before starting some quick&dirty hack, I would like to know
> if someone already has a patch pending and is able to share even just
> preliminary results.
>
> Thanks,
> Jan

Yeah, the patchset is mostly completed. But I have to switch to do EPT 
enabling these days so don't have time to do more test and push them out...

I tested patchset by NMI watchdog(also introduce the logic of the NMI 
watchlog), about one thousand NMI per second at most. The patchset also did 
some clean up on VMX interrupt handling. I would like to push the patch next 
week (if the EPT things can be done this week or early next week). Sorry for 
keep you waiting so long...

--
Thanks
Yang, Sheng

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