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This can accommodate 10 bridges (including root bridges, PCIe upstream and downstream ports, etc -- see <https://bugzilla.redhat.com/show_bug.cgi?id=1333238#c12> for more details). 10 is not a whole lot, but closer to the architectural limit of 15 than our current 4, so it can be considered a stop-gap solution until all guests manage to migrate to virtio-1.0, and no longer need PCI IO BARs behind PCIe downstream ports. Cc: Gabriel Somlo <somlo@cmu.edu> Cc: Jordan Justen <jordan.l.justen@intel.com> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1333238 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Tested-by: Gabriel Somlo <somlo@cmu.edu>