[SeaBIOS] [Qemu-devel] [seabios patch 0/5] dynamic pci i/o windows
Kevin O'Connor
kevin at koconnor.net
Fri May 4 16:46:00 CEST 2012
On Fri, May 04, 2012 at 04:01:56PM +0200, Gerd Hoffmann wrote:
> On 05/04/12 15:18, Kevin O'Connor wrote:
> > 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?
>
> Suggestions on how to update the pci host bridge windows in the dsdt then?
Perhaps malloc_high() a struct with the info you need and then create
an OperationRegion() in the dynamically generated SSDT with the
address of the struct.
-Kevin
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