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Re: [Qemu-devel] [PATCH 11/25] q35: Introduce q35 pc based chipset emula


From: Jason Baron
Subject: Re: [Qemu-devel] [PATCH 11/25] q35: Introduce q35 pc based chipset emulator
Date: Fri, 14 Sep 2012 10:11:20 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, Sep 14, 2012 at 09:37:03AM +0200, Gerd Hoffmann wrote:
> On 09/13/12 22:12, Jason Baron wrote:
> > +    if (ram_size >= 0xe0000000) {
> > +        above_4g_mem_size = ram_size - 0xe0000000;
> > +        below_4g_mem_size = 0xe0000000;
> 
> We should make the hole larger to get more pci i/o address space below
> 4G, especially as q35 needs a good chunk of it for mmconfig.
> 
> I think at least 0xc0000000, maybe even 0xb0000000.  The later would
> allow to place mmconfig @ 0xb0000000, one big 512MB pci bar @ 0xc0000000
> (think gfx card pass-through) and all the remaining little stuff above
> 0xe0000000.
> 
> cheers,
>   Gerd
> 
> 

Ok, I had played with increasing the pci hole (and corresponding dsdt
table changes), I can try going to a bigger size as you suggest.

Thanks,

-Jason



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