On Thu, 20 Dec 2018 at 15:39, Laine Stump <la...@redhat.com> wrote: > [...] > I think you're right. Each bus requires some amount of IO space, and I > thought I recalled someone saying that all of the available IO space is > exhausted after 7 or 8 buses. This was in relation to PCIe, where each > root port is a bus, and can potentially take up IO space, so possibly in > that context they were talking about the buses *after* the root bus and > pcie-pci-bridge, which would bring us back to the same number you're > getting. > > For PCIe our solution was to turn off IO space usage on the > pcie-root-ports, but you can't do that for conventional PCI buses, since > the devices might actually need IO space to function properly and the > standard requires that you provide it. >
Ok, that makes sense. > > The real question though is why you need to create sooooo many PCI buses. > > Each bus can do 31 devices. Do you really need to have more than 279 > > devices in your VM ? > > And if you do need more than 279 devices, do they all need to be > hot-pluggable? If not, then you can put up to 8 devices on each slot > (functions 0 - 7). > True. I'll use the function field too, then. Thanks a lot! Riccardo
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