xen:balloon: reserve_additional_memory: add_memory() failed: -17
Solution 1:
This is a known bug in few HVM EC2 servers.
It is unclear if the issue is in the kernel or Amazon's configuration for EC2.
You'll have to add/use the following PPA to fix this:
https://launchpad.net/~inaddy/+archive/ubuntu/lp1304001
Using this PPA resolved the issue for most of the users.
Ref: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1304001