[libvirt] [PATCHv2.5 00/10] Add support for memory hotplug

Peter Krempa pkrempa at redhat.com
Thu Apr 9 13:13:37 UTC 2015

On Thu, Apr 02, 2015 at 16:35:20 +0530, Prerna Saxena wrote:
> Hi Peter,
> While playing around with memory hotplug implementation, I found that the guest XML isnt updated after a successful hotplug operation :
> [root at kop2 test-libvirt]# ./bin/virsh attach-device rhel71-be /home/prerna/mem-hp.xml
> Device attached successfully
> [root at kop2 test-libvirt]# ./bin/virsh qemu-monitor-command rhel71-be  --hmp "info memdev"                                                                     
>   memory backend: 0
>   size:  1073741824
>   merge: true
>   dump: true
>   prealloc: false
>   policy: default
>   host nodes:
> [root at kop2 test-libvirt]# ./bin/virsh edit rhel71-be
> < Does not reflect an updated memory value or a separate dimm device >
After the attach-device command, the device should show up in the XML.

> I have observed this on PowerKVM.
> Wondering what is a good place to observe the hot-added memory : Should this reflect as  an updated value for current memory in domain XML, or should this show up as a memory device of type:
> <memory model='dimm'>
>   <source>
>     <pagesize unit='KiB'>4096</pagesize>
>     <nodemask>1-3</nodemask>
>   </source>
>   <target>
>     <size unit='KiB'>524287</size>
>     <node>1</node>
>   </target>
> </memory>
> I would be happy to work on a patch to fix this. Pls provide me your thoughts.

If it does not it is a bug, but I'm not able to reproduce it, so go
ahead and fix it if you want, or provide more information on why it


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