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acpi: ich9: add CPU hotplug handling to Q35 machine

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.. use IO port 0cd8-0xcf7 range for CPU present bitmap

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Igor Mammedov 2014-01-09 17:36:32 +01:00 • committed by Michael S. Tsirkin
parent 81cea5e7f2
commit d6610bc2ad
4 changed files with 22 additions and 1 deletions
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4
docs/specs/acpi_cpu_hotplug.txt
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@ -10,7 +10,9 @@ 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 0xaf00-0xaf1f, 1-byte access):
CPU present bitmap for:
ICH9-LPC (IO port 0x0cd8-0xcf7, 1-byte access)
PIIX-PM (IO port 0xaf00-0xaf1f, 1-byte access)
---------------------------------------------------------------
One bit per CPU. Bit position reflects corresponding CPU APIC ID.
Read-only.