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acpi: add hardware implementation for memory hot unplug

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- implements QEMU hardware part of memory hot unplug protocol
  described at "docs/spec/acpi_mem_hotplug.txt"
- handles memory remove notification event
- handles device eject notification

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Guihua 2015-04-27 16:47:21 +08:00 • committed by Michael S. Tsirkin
parent 660e8ec700
commit c06b2ffb02
8 changed files with 61 additions and 5 deletions
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11
docs/specs/acpi_mem_hotplug.txt
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@ -19,7 +19,9 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
1: Device insert event, used to distinguish device for which
no device check event to OSPM was issued.
It's valid only when bit 1 is set.
2-7: reserved and should be ignored by OSPM
2: Device remove event, used to distinguish device for which
no device eject request to OSPM was issued.
3-7: reserved and should be ignored by OSPM
[0x15-0x17] reserved
write access:
@ -38,7 +40,12 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
1: if set to 1 clears device insert event, set by OSPM
after it has emitted device check event for the
selected memory device
2-7: reserved, OSPM must clear them before writing to register
2: if set to 1 clears device remove event, set by OSPM
after it has emitted device eject request for the
selected memory device
3: if set to 1 initiates device eject, set by OSPM when it
triggers memory device removal and calls _EJ0 method
4-7: reserved, OSPM must clear them before writing to register
Selecting memory device slot beyond present range has no effect on platform:
- write accesses to memory hot-plug registers not documented above are