On Tue, 2016-08-09 at 11:59 -0400, Laine Stump wrote:
One thing that's not quite clear to me about pcie-expander-bus: according to the code and comment, it has a single slot that can accomodate either a pcie-root-port or a dmi-to-pci-bridge. It seems like that would limit its usefulness quite a lot... I would expect at least a pcie-switch-upstream-port to be usable as well. Marcel, can you confirm either way? You can't plug a pcie-switch-upstream-port directly into a pcie-expander bus (see https://bugzilla.redhat.com/show_bug.cgi?id=1361172 which was the subject of patch 2) You can however plug in a pcie-root-port, and then connect a pcie-switch-upstream-port into the pcie-root-port. (and then of course plug a bunch of pcie-switch-downstream-ports into the upstream-port, and devices into the downstream ports).
I see. That's a bit unfortunate, I guess, but at least it's not entirely pointless :)
So does this get ACK with the changes/explanations above? Or do you want me to re-send it?
https://i.imgflip.com/18o30w.jpg -- Andrea Bolognani / Red Hat / Virtualization