Re: [PATCH 5/9] kvm-x86: Enable NMI Watchdog via in-kernel PIT source

["Yang, Sheng" <sheng.yang@intel.com>]

On Tuesday 23 September 2008 23:04:48 Jan Kiszka wrote:
> Yang, Sheng wrote:
> > On Friday 19 September 2008 20:03:02 Jan Kiszka wrote:
> >> LINT0 of the LAPIC can be used to route PIT events as NMI watchdog
> >> ticks into the guest. This patch aligns the in-kernel irqchip emulation
> >> with the user space irqchip with already supports this feature. The
> >> trick is to route PIT interrupts to all LAPIC's LVT0 lines.
> >>
> >> Rebased patch and slightly polished patch originally posted by Sheng
> >> Yang.
> >
> > Signed-off-by: Sheng Yang <sheng.yang@intel.com>
> >
> > Thanks for pick up this patch again!
> >
> > Have you test some Windows guest with this watchdog? Last time I dropped
> > it because it cause BSOD on some version of
> > Windows(IRQ_NOT_EQUAL_OR_LESS). I don't remember the exactly situation
> > there, but you may have a try.
>
> Not yet. I always tell my colleagues that I don't need Windows on my
> desktop, I just need a few VM images - for testing... :)
>
> I will try to dig out / generate some image and reproduce the issue you
> and Gleb see. Hope it will trigger here as well. Anything special
> required to make Windows use the NMI as watchdog?
>
I don't know if Windows use NMI watchdog. In fact, my original patch just 
cause Windows BSOD, and I think Windows don't use it(Linux NMI watchdog 
mechanism is a little tricky one)...

--
regards
Yang, Sheng