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

Avi Kivity
2011-07-25T14:10:19Z

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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