Hot-plugged PCIe device configuration system

An Information Handling System (IHS), comprising:

• a Peripheral Component Interconnect express (PCIe) connector;
• a Basic Input Output System (BIOS) coupled to the PCIe connector;
• a processing system that is coupled to the PCIe connector and the BIOS;
• and
• a memory system that is coupled to the processing system and that includes instructions that, when executed by the processing system, cause the processing system to provide an operating system engine that is configured to:
• detect that a PCIe device has been hot-plugged into the PCIe connector when the operating system engine is in a runtime state and, in response, use a first register write location value in a first PCIe setting record to determine a location in a PCIe configuration space that provides a first PCIe configuration space register of a plurality of PCIe configuration space registers included in the PCIe configuration space,
• wherein the location in the PCIe configuration space that provides the first PCIe configuration space register is unknown to the operating system engine, and
• wherein the operating system engine obtained the first PCIe setting record having the first register write location value from the BIOS during a boot state;
• use first register value information in the first PCIe setting record to determine at least one register value change for the first PCIe configuration register;
• and
• write the at least one register value change to the first PCIe configuration space register using the location.

A method for configuring a hot-plugged Peripheral Component Interconnect express (PCIe) device, comprising:

• detecting, by an operating system provided by a computing system, that a PCIe device has been hot-plugged into the computing system when the operating system is in a runtime state, and, in response, using a first register write location value in a first PCIe setting record to determine a location in a PCIe configuration space that provides a first PCIe configuration space register of a plurality of PCIe configuration space registers included in the PCIe configuration space,
• wherein the location in the PCIe configuration space that provides the first PCIe configuration space register is unknown to the operating system, and
• wherein the operating system obtained the first PCIe setting record having the first register write location value from a Basic Input Output System (BIOS) during a boot state;
• using, by the operating system, first register value information in the first PCIe setting record to determine at least one register value change for the first PCIe configuration register;
• and
• writing, by the operating system, the at least one register value change to the first PCIe configuration space register using the location.