docs/specs/acpi_pci_hotplug.txt

   1 QEMU<->ACPI BIOS PCI hotplug interface
   2 --------------------------------------
   3
   4 QEMU supports PCI hotplug via ACPI, for PCI bus 0. This document
   5 describes the interface between QEMU and the ACPI BIOS.
   6
   7 ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
   8 -----------------------------------------
   9
  10 Generic ACPI GPE block. Bit 1 (GPE.1) used to notify PCI hotplug/eject
  11 event to ACPI BIOS, via SCI interrupt.
  12
  13 PCI slot injection notification pending (IO port 0xae00-0xae03, 4-byte access):
  14 ---------------------------------------------------------------
  15 Slot injection notification pending. One bit per slot.
  16
  17 Read by ACPI BIOS GPE.1 handler to notify OS of injection
  18 events.
  19
  20 PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access):
  21 -----------------------------------------------------
  22 Slot removal notification pending. One bit per slot.
  23
  24 Read by ACPI BIOS GPE.1 handler to notify OS of removal
  25 events.
  26
  27 PCI device eject (IO port 0xae08-0xae0b, 4-byte access):
  28 ----------------------------------------
  29
  30 Used by ACPI BIOS _EJ0 method to request device removal. One bit per slot.
  31 Reads return 0.
  32
  33 PCI removability status (IO port 0xae0c-0xae0f, 4-byte access):
  34 -----------------------------------------------
  35
  36 Used by ACPI BIOS _RMV method to indicate removability status to OS. One
  37 bit per slot.