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Re: [Xen-devel] [PATCH v3] x86/p2m: use large pages for MMIO mappings

On Thu, 2016-01-14 at 03:04 -0700, Jan Beulich wrote:
> - ARM side unimplemented (and hence libxc for now made cope with both
> Â models),

So, one model is the one described in the commit message:

> - zero (success, everything done)
>Â- positive (success, this many done, more to do: re-invoke)
>Â- negative (error)

What is the other one? I'd expect ARM to already implement a subset of this
(i.e. 0 or negative, perhaps with a subset of the possible errno values), which 
I'd then expect libxc to just cope with without it constituting a second model.

IOW I don't think there should be (or indeed is) any special casing of ARM
vs x86 here or one model vs another, just a case of one arch only using a
subset of the expressibility of the interface.

What have I missed?

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