On Thu, Jan 19, 2012 at 09:33:51AM +0100, Jan Kiszka wrote:
> Hi all,
>
> I've finished a first version of cleaned-up in-kernel KVM PIT support.
> That will be rolled out once the base support for irqchip has been merged.
>
> I'm now wondering if and how to model two control knobs we have in qemu-kvm:
>
> o -no-kvm-pit, ie. disable the in-kernel PIT even when {A,IOA,}PIC
> are kernel based (default: off, ie. use in-kernel PIT)
It can be useful for debugging.
> o -no-kvm-pit-reinjection, ie. control over the lost ticks reinjection
> logic in the kernel (default: off, ie. do reinject)
If the guest kernel does not compensate for lost ticks, reinjection is
needed. Otherwise, it might cause problems.
Therefore this option is needed.
> So far I dropped the former and modeled the latter via a qdev property.
> But I tend to think that even the latter knob is superfluous. In that
> case I would also deprecate the original switches in qemu-kvm, just like
> recently done with -tdf.
>
> Other thoughts?
>
> Jan
>
> --
> Siemens AG, Corporate Technology, CT T DE IT 1
> Corporate Competence Center Embedded Linux
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