Re: [Qemu-devel] [RFC v5 86/86] 440fx: fix PAM, PCI holes

[Avi Kivity]

On 07/25/2011 05:08 PM, Anthony Liguori wrote:
> > Why not use 3.5GB and call it a day? It's safer for memory hotplug, if
> > we ever get it.
> >
> > The guest will never put a PCI BAR below that anyway.
>
>
> My entire concern is that they will.
>
> We're not just talking about Windows or Linux here, but any odd DOS 
> application that's smart enough to switch into 32-bit mode, 
> bootloaders, etc.
>
> It's a significant behaviorial change that goes against the spec for 
> no obviously good reason.

Okay, I'll update the patch.

> Even if we supported hot plug, we could easily just hot plug above the 
> 4GB mark.

Or change the PCI hole dynamically.

--
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