[SeaBIOS] [seabios patch 0/5] dynamic pci i/o windows

Kevin O'Connor kevin at koconnor.net
Fri May 4 15:18:33 CEST 2012


On Fri, May 04, 2012 at 10:21:22AM +0200, Gerd Hoffmann wrote:
>   Hi,
> 
> This patch series makes the PCI I/O windows runtime-configurable via
> qemu firmware config interface.  Main advantage is that we can size and
> shuffle around the PCI i/O windows according to the amount of memory the
> virtual machine has.  We don't need a hole for 64bit PCI bars, we can
> just map them above the main memory.  The hole for 32bit PCI bars can be
> enlarged for guests with less than 3.5 GB of memory.

Why pass in a PCI IO range through fw_cfg if SeaBIOS can figure out an
acceptable range from the amount of memory in the machine?

-Kevin



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