Re: [Xen-devel] [v3][PATCH 07/16] hvmloader/pci: skip reserved ranges

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.06.15 at 10:26, <tiejun.chen@xxxxxxxxx> wrote:
> Something hits me to generate another idea,
> 
> #1. Still allocate all devices as before.
> #2. Lookup all actual bars to check if they're conflicting RMRR
> 
> We can skip these bars to keep zero. Then later it would make lookup easily.
> 
> #3. Need to reallocate these conflicting bars.
> #3.1 Trying to reallocate them with the remaining resources
> #3.2 If the remaining resources aren't enough, we need to allocate them 
> from high_mem_resource.

That's possible onyl for 64-bit BARs.

> I just feel this way may be easy and better. And even, this way also can 
> help terminate the preexisting allocation failures, right?

I think this complicates things rather than simplifying them: The
more passes (and adjustments to previous settings) you do, the
more error prone the whole logic will become. It may well be that
you need to basically re-write what is there right now...

Jan


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