qemu/docs/pcie_pci_bridge.txt

10 But due to its strict limitations - no support of hot-plug,
16 can be hot-plugged into appropriate root port (requires additional actions,
17 see 'PCIE-PCI bridge hot-plug' section),
18 and supports devices hot-plug into the bridge itself
21 Hot-plug of legacy PCI devices into the bridge
22 is provided by bridge's built-in Standard hot-plug Controller.
25 PCIE-PCI bridge hot-plug
27 Guest OSes require extra efforts to enable PCIE-PCI bridge hot-plug.
30 to a hot-plugged devices in future.
36 that is planned to have PCIE-PCI bridge hot-plugged in.
91  (2) Hot-plugged:
94                      another plugged into the hot-plugged bridge.
98 The PCIE-PCI bridge can be hot-plugged only into pcie-root-port that
100 hot-plugged bridge.
102 Windows 7 and older versions don't support hot-plug devices into the PCIE-PCI bridge.
103 To enable device hot-plug into the bridge on Linux there're 3 ways:
107     which allows the bridge to notify the OS about hot-plug event without having