vfio: Add sysfsdev property for pci & platform

[qemu.git] / docs / memory-hotplug.txt

diff --git a/docs/memory-hotplug.txt b/docs/memory-hotplug.txt
index f70571df0ca7fb19af62dd61d34206e307fc98ed..56bdd0a47b4e88d8bd528a34cad17946a7500aaf 100644 (file)
--- 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.
 
 This document explains how to use the memory hotplug feature in QEMU,
 which is present since v2.1.0.
 

-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.

 
 Basic RAM hotplug
 -----------------
 
 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=dimm1,memdev=mem1 \
    -object memory-backend-file,id=mem2,size=256M,mem-path=/mnt/hugepages-2MB \
    -device pc-dimm,id=dimm2,memdev=mem2
    -device pc-dimm,id=dimm1,memdev=mem1 \
    -object memory-backend-file,id=mem2,size=256M,mem-path=/mnt/hugepages-2MB \
    -device pc-dimm,id=dimm2,memdev=mem2

+
+
+RAM hot-unplug
+---------------
+
+In order to be able to hot unplug pc-dimm device, QEMU has to be told the 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, and its memory
+backend is "mem1", the following commands tries to remove it.
+
+  (qemu) device_del dimm1
+  (qemu) object_del mem1