[libvirt] [Qemu-ppc] [RFC PATCH qemu] spapr_pci: Create PCI-express root bus by default

[Greg Kurz]

On Tue, 13 Dec 2016 14:25:44 +0200
Marcel Apfelbaum <marcel at redhat.com> wrote:

> >> Now... from what Laine was saying it sounds like more of the
> >> differences between PCI-E placement and PCI placement may be
> >> implemented by libvirt than qemu than I realized.  So possibly we do
> >> want to make the bus be PCI-E on the qemu side, but have libvirt use
> >> the vanilla-PCI placement guidelines rather than PCI-E for pseries.  
> >
> > Basically the special casing I was mentioning earlier.  
> 
> That looks complicated.. I wish I would no more about the pseries
> PCIe stuff, does any one know where I can get the info ? (besides 'google it'...)

This is described in the LoPAPR specification, available at:

https://openpowerfoundation.org/wp-content/uploads/2016/05/LoPAPR_DRAFT_v11_24March2016_cmt1.pdf

Cheers.

--
Greg