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Date: Mon, 11 May 2015 14:48:01 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: [Qemu-devel] [PULL 16/28] docs: update documentation for memory hot
	unplug
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To: qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>, Zhu Guihua <zhugh.fnst@cn.fujitsu.com>, Luiz Capitulino <lcapitulino@redhat.com>, Paulo Vital <paulo.vital@profitbricks.com>, Igor Mammedov <imammedo@redhat.com>

From: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>

Add specification about how to use memory hot unplug, and add
a flow diagram to explain memory hot unplug process.

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>
---
 docs/memory-hotplug.txt         | 23 +++++++++++++++++++---
 docs/specs/acpi_mem_hotplug.txt | 42 +++++++++++++++++++++++++++++++++++=
+++++-
 2 files changed, 61 insertions(+), 4 deletions(-)

diff --git a/docs/memory-hotplug.txt b/docs/memory-hotplug.txt
index f70571d..56bdd0a 100644
--- a/docs/memory-hotplug.txt
+++ b/docs/memory-hotplug.txt
@@ -4,9 +4,7 @@ QEMU memory hotplug
 This document explains how to use the memory hotplug feature in QEMU,
 which is present since v2.1.0.
=20
-Please, note that memory hotunplug is not supported yet. This means
-that you're able to add memory, but you're not able to remove it.
-Also, proper guest support is required for memory hotplug to work.
+Guest support is required for memory hotplug to work.
=20
 Basic RAM hotplug
 -----------------
@@ -74,3 +72,22 @@ comes from regular RAM, 1GB is a 1GB hugepage page and=
 256MB is from
    -device pc-dimm,id=3Ddimm1,memdev=3Dmem1 \
    -object memory-backend-file,id=3Dmem2,size=3D256M,mem-path=3D/mnt/hug=
epages-2MB \
    -device pc-dimm,id=3Ddimm2,memdev=3Dmem2
+
+
+RAM hot-unplug
+---------------
+
+In order to be able to hot unplug pc-dimm device, QEMU has to be told th=
e ids
+of pc-dimm device and memory backend object. The ids were assigned when =
you hot
+plugged memory.
+
+Two monitor commands are used to hot unplug memory:
+
+ - "device_del": deletes a front-end pc-dimm device
+ - "object_del": deletes a memory backend object
+
+For example, assuming that the pc-dimm device with id "dimm1" exists, an=
d its memory
+backend is "mem1", the following commands tries to remove it.
+
+  (qemu) device_del dimm1
+  (qemu) object_del mem1
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplu=
g.txt
index 1290994..dcc4808 100644
--- a/docs/specs/acpi_mem_hotplug.txt
+++ b/docs/specs/acpi_mem_hotplug.txt
@@ -2,7 +2,7 @@ QEMU<->ACPI BIOS memory hotplug interface
 --------------------------------------
=20
 ACPI BIOS GPE.3 handler is dedicated for notifying OS about memory hot-a=
dd
-events.
+and hot-remove events.
=20
 Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
 ---------------------------------------------------------------
@@ -42,3 +42,43 @@ Selecting memory device slot beyond present range has =
no effect on platform:
      ignored
    - read accesses to memory hot-plug registers not documented above ret=
urn
      all bits set to 1.
+
+Memory hot remove process diagram:
+----------------------------------
+ +-------------+=E2=80=89=E2=80=89=E2=80=89=E2=80=89=E2=80=89+----------=
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