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4 This document explains how to use the memory hotplug feature in QEMU,
13 hotpluggable memory slots to create and what is the maximum amount of
14 memory the guest can grow. This is done at startup time by means of
15 the -m command-line option, which has the following format:
21  - "megs" is the startup RAM. It is the RAM the guest will boot with
22  - "slots" is the number of hotpluggable memory slots
23  - "maxmem" is the maximum RAM size the guest can have
25 For example, the following command-line:
30 The hotpluggable memory slots are empty when the guest is booted, so all
31 memory the guest will see after boot is 1GB. The maximum memory the
33 hotplugged by using any combination of the available memory slots.
39                  into the first empty slot
41 For example, the following commands add another 1GB to the guest
47 Using the file backend
54 For example, assuming that the host has 1GB hugepages available in
55 the /mnt/hugepages-1GB directory, a 1GB hugepage could be hotplugged
56 into the guest from the previous section with the following commands:
61 It's also possible to start a guest with memory cold-plugged into the
63 but this allows for a lot of flexibility when using the file backend.
65 In the following command-line example, an 8GB guest is created where 6GB
67 2MB pages. Also, the guest has additional memory slots to hotplug more
80 In order to be able to hot unplug pc-dimm device, QEMU has to be told the ids
81 of pc-dimm device and memory backend object. The ids were assigned when you hot
89 For example, assuming that the pc-dimm device with id "dimm1" exists, and its memory
90 backend is "mem1", the following commands tries to remove it.