Setting up the PCIe hotplug in Kernel for Flexible Setups
summary
Covers PCIe hotplug handling in the Linux kernel for dynamic, frequent topology changes by describing kernel-side resource reallocation: pausing affected drivers and instructing them to update resources so new devices can be inserted into an existing PCIe tree. Discusses removing requirements for firmware/BIOS/bootloader or a Hot-Plug Controller to reserve bus numbers and memory, enabling hot-switching of complex device clusters (bridges, NVMe, GPUs, etc.) without reboot.
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