2013-04-25 16:05:25 +02:00
|
|
|
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.
|
|
|
|
|
|
2014-01-09 17:36:32 +01:00
|
|
|
CPU present bitmap for:
|
|
|
|
|
ICH9-LPC (IO port 0x0cd8-0xcf7, 1-byte access)
|
|
|
|
|
PIIX-PM (IO port 0xaf00-0xaf1f, 1-byte access)
|
2013-04-25 16:05:25 +02:00
|
|
|
---------------------------------------------------------------
|
|
|
|
|
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.
|
