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

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

On 2015/6/17 17:02, Jan Beulich wrote:
> > > > 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.
You're right so this means its not proper to adjust mmio_total to 
include conflicting reserved ranges and finally moved all conflicting 
bars to high_mem_resource as Kevin suggested previously, so i high 
level, we still need to decrease pci_mem_start to populate more RAM to 
compensate them as I did, right?
> > 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...
Yeah,  we need to think about this carefully.

Thanks
Tiejun

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