23 lines
836 B
Plaintext
23 lines
836 B
Plaintext
|
QEMU<->ACPI BIOS CPU hotplug interface
|
||
|
|
--------------------------------------
|
||
|
|
|
||
|
|
QEMU supports CPU hotplug via ACPI. This document
|
||
|
|
describes the interface between QEMU and the ACPI BIOS.
|
||
|
|
|
||
|
|
ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
|
||
|
|
-----------------------------------------
|
||
|
|
|
||
|
|
Generic ACPI GPE block. Bit 2 (GPE.2) used to notify CPU
|
||
|
|
hot-add/remove event to ACPI BIOS, via SCI interrupt.
|
||
|
|
|
||
|
|
CPU present bitmap (IO port 0xaf00-0xae1f, 1-byte access):
|
||
|
|
---------------------------------------------------------------
|
||
|
|
One bit per CPU. Bit position reflects corresponding CPU APIC ID.
|
||
|
|
Read-only.
|
||
|
|
|
||
|
|
CPU hot-add/remove notification:
|
||
|
|
-----------------------------------------------------
|
||
|
|
QEMU sets/clears corresponding CPU bit on hot-add/remove event.
|
||
|
|
CPU present map read by ACPI BIOS GPE.2 handler to notify OS of CPU
|
||
|
|
hot-(un)plug events.
|