memory hotplug for guests?

[Tomasz Chmielewski <mangoo-Nem3ZqsbT/g@public.gmane.org>]

Does KVM allow something like "memory hotplug" for its guests?


For example, lets says you are running several guests, and would like to 
start yet another one for a while - but have no free memory left.


Obviously, your guests are so important that you don't want to stop them 
- so you simply "hotplug remove" memory from a guest that has a lot of 
free memory left - and start a new guest.

When that new guest is no longer needed, and is stopped, you can 
"hotplug add" memory to the guest it was previously removed from.

Guest's kernel would of course need to support memory hotplugging, too.


Is it possible with KVM? If not, is such a feature planned?

I noticed it was only mentioned once or twice on the list:

http://article.gmane.org/gmane.comp.emulators.kvm.devel/712/

"Well, the _interface_ supports removing, the implementation does not :)

Everything was written in mind to allow memory hotplug."



-- 
Tomasz Chmielewski
http://wpkg.org

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