RE: [Xen-devel] [patch] more correct pfn_valid()

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Thanks and that's make it clearer now. So just for last 
> confirmation (sorry for tedious):
>       1. If driver domN's 'physical' memory is set as 0 - 4G 
> continuously, and
>       2. When dom0 does PCI bus init, machine mmio space is 
> set between [3G, 3G+512M] (Take a large range for example),
> 
> Under above 2 conditions, current paravirtualized 
> implementation can clearly handle between:
>       1. A normal access to 'physical' 3G + 4k address, and
>       2. Access to machine mmio address 3G + 4k of some 
> physical device
> 
> Is that assumption right? 

Yes, that's it.

> BTW, will that make some 
> complexities for non-access operation, like comparison upon 
> some address?

Linux doesn't do this (It doesn't make sense anyhow).

Ian

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