Re: [Qemu-devel] [PATCH RFC] docs: add PCIe devices placement guidelines

[Andrea Bolognani]

On Mon, 2016-10-10 at 17:15 +0300, Marcel Apfelbaum wrote:
> > > > 2) can you really only plug a pcie-root-port (ioh3420)
> > > > into a pxb-pcie? Or will it accept anything that pcie.0
> > > > accepts?
> > > 
> > > It supports only PCI Express Root Ports. It does not
> > > support Integrated Devices.
> > 
> > So no PCI Express Switch Upstream Ports?
> 
> The switch upstream ports can only be plugged into PCIe Root Ports.
> There is an error in the RFC showing otherwise, it is already
> corrected in V1, not yet upstream.

I was pretty sure that was the case, but I wanted to
double-check just to be on the safe side ;)

> > What about DMI-to-PCI Bridges?
> 
> Yes, the dmi-to-pci bridge can be plugged into the pxb-pcie, I'll
> be sure to emphasize it.

Cool. I would have been very surprised if that would have
not been the case, considering how we need to use multiple
pxb-pcie to link PCI devices to specific NUMA nodes.

-- 
Andrea Bolognani / Red Hat / Virtualization