[Bug 579723] Re: kvm memory ballooning is unusable in Lucid

[Andrew Radke]

This sounds like you need to adjust the libvirtd apparmor profile.

Edit
    /etc/apparmor.d/abstractions/libvirt-qemu
and add the following line:

  /usr/bin/kvm-balloon rmix,

-- 
kvm memory ballooning is unusable in Lucid
https://bugs.launchpad.net/bugs/579723
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