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SubjectRe: [PATCH v8] KVM: PPC: reserve a capability and ioctl numbers for realmode VFIO
On Wed, Aug 28, 2013 at 11:26:31AM +1000, Benjamin Herrenschmidt wrote:
> On Wed, 2013-08-28 at 10:51 +1000, Alexey Kardashevskiy wrote:
> > The ioctl I made up is basically a copy of KVM_CREATE_SPAPR_TCE which does
> > the same thing for emulated devices and it is there for quite a while but
> > it is not really extensible. And these two ioctls share some bits of code.
> > Now we will have 2 pieces of code which do almost the same thing but in a
> > different way. Kinda sucks :(
>
> Right. Thus the question, Gleb, we can either:
>
> - Keep Alexey patch as-is allowing us to *finally* merge that stuff
> that's been around for monthes
>
> - Convert *both* existing TCE objects to the new
> KVM_CREATE_DEVICE, and have some backward compat code for the old one.
>
> I don't think it makes sense to have the "emulated TCE" and "IOMMU TCE"
> objects use a fundamentally different API and infrastructure.
>
As a general rule we are not going to mandate converting old devices to
new API, but if it make sense to do here I would much prefer that over
adding another special ioctl

> > >> So my stuff is not going to upstream again. Heh. Ok. I'll implement it.
> > >>
> > > Thanks! Should I keep KVM_CAP_SPAPR_MULTITCE capability patch or can I
> > > drop it for now?
> >
> > Please keep it, it is unrelated to the IOMMU-VFIO thing.
>

--
Gleb.


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