Memory ballooning deactivated by the guest

[Daniel Bareiro <daniel-listas@gmx.net>]

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Hi all!

I'm using Linux 2.6.32.2 with qemu-kvm-0.12.1.1 and, testing memory
ballooning, I obtained the following message:

root@ubuntu:~# telnet localhost 5001
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
QEMU 0.12.1 monitor - type 'help' for more information
(qemu)
(qemu)
(qemu)
(qemu) info balloon
The balloon device has not been activated by the guest


I have understood that to do balooning it is sufficient that kernel of
guest is compiled with virtio-balloon driver:

test:~# uname -a
Linux test 2.6.32-dgb #1 SMP Thu Dec 24 23:42:21 ART 2009 x86_64
GNU/Linux
test:~#
test:~#
test:~#
test:~# cat /boot/config-2.6.32-dgb | grep -i virtio
CONFIG_NET_9P_VIRTIO=m
CONFIG_VIRTIO_BLK=m
CONFIG_VIRTIO_NET=m
# CONFIG_VIRTIO_CONSOLE is not set
CONFIG_HW_RANDOM_VIRTIO=m
CONFIG_VIRTIO=m
CONFIG_VIRTIO_RING=m
CONFIG_VIRTIO_PCI=m
CONFIG_VIRTIO_BALLOON=m


Which can be the problem?

Thanks in advance.

Regards,
Daniel
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