Re: [Xen-devel] [PATCH 3/8] xen/arm: Implement p2m_type_t as an enum

[Tim Deegan <tim@xxxxxxx>]

At 15:52 +0000 on 05 Dec (1386255150), Ian Campbell wrote:
> On Thu, 2013-12-05 at 15:42 +0000, Julien Grall wrote:
> > Until now, Xen doesn't know the type of the page (ram, foreign page, 
> > mmio,...).
> > Introduce p2m_type_t with basic types:
> >     - p2m_invalid: Nothing is mapped here
> 
> Do we really need this? Is it not equivalent to not setting the present
> bit? I see x86 has the same type though -- Tim can you explain why.

There are other not-present types on x86: PoD, paged-out, emulated-MMIO.  

Tim.

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