diff options
| author | Zhu Guihua <zhugh.fnst@cn.fujitsu.com> | 2015-04-27 16:47:21 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2015-04-27 21:09:07 +0200 |
| commit | c06b2ffb02bfcc642c67300d2c4dffd5aa54932b (patch) | |
| tree | 92df290e7b207f928e8e50cf298be347a391294e /docs | |
| parent | 660e8ec70065c8b1fd68b2cb137de16d831959f4 (diff) | |
acpi: add hardware implementation for memory hot unplug
- 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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/specs/acpi_mem_hotplug.txt | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt index 68daa14764..3df3620ce4 100644 --- a/docs/specs/acpi_mem_hotplug.txt +++ b/docs/specs/acpi_mem_hotplug.txt @@ -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 |