[SeaBIOS] Re: [PATCH 4/4] only enable 64bit pci io window when RAM >60G

[Kevin O'Connor]

On Fri, Jun 14, 2024 at 12:54:28PM +0200, Gerd Hoffmann wrote:
> Hi,
> > Be a bit more conservative, and only enable the window by default when
> > the ram size extends beyond 60G. Due to the mmio window this translates
> > to an effective working configuration limit of 58G/59G, depending on
> > machine type.
>
> Why 60GB not 64GB?

Could this change introduce a further regression - guests with 32GB of
ram that need extra pci space now break?

If ram size is not a good indicator of being 64bit capable, are there
other indicators that we could use (eg, looking for how much memory
the PCI devices are requesting)?

Cheers,
-Kevin