I would like to reproduce this first and for that I will need at least
config file that is used for launching the guest ('memory' and 'maxmem'
for sure but having the whole file would be better) as well as guest's
kernel config file. Knowing what xen boot options are as well as if
there is anything "interesting" in /etc/xen/{xl.conf|xend-config.sxp}
may also be helpful.

But seeing debug output definitely won't hurt. In fact, add 'debug
loglevel=8 memblock=debug' to boot line for good measure (I hope it
won't be too much output).

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https://bugs.launchpad.net/bugs/1304001

Title:
   xen:balloon errors in 14.04 beta

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Xen balloon errors on HVM instances on EC2 (Xen 4.2.amazon):


  
  ubuntu@ip-10-63-20-99:~$ uname -a
  Linux ip-10-63-20-99 3.13.0-23-generic #45-Ubuntu SMP Fri Apr 4 06:58:38 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
  ubuntu@ip-10-63-20-99:~$ dmesg  |grep xen
  [    0.000000] xen:events: Xen HVM callback vector for event delivery is 
enabled
  [    0.494613] xen:balloon: Initialising balloon driver
  [    0.496046] xen_balloon: Initialising balloon driver
  [    0.500077] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [    0.541047] Switched to clocksource xen
  [    0.562579] xen: --> pirq=16 -> irq=8 (gsi=8)
  [    0.562622] xen: --> pirq=17 -> irq=12 (gsi=12)
  [    0.562649] xen: --> pirq=18 -> irq=1 (gsi=1)
  [    0.562673] xen: --> pirq=19 -> irq=6 (gsi=6)
  [    0.562705] xen: --> pirq=20 -> irq=4 (gsi=4)
  [    0.920527] xen: --> pirq=21 -> irq=47 (gsi=47)
  [    0.920596] xen:grant_table: Grant tables using version 1 layout
  [    1.029661] xen_netfront: Initialising Xen virtual ethernet driver
  [    1.236083] xenbus_probe_frontend: Device with no driver: device/vfb/0
  [    2.516067] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [    6.533941] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   14.560075] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   30.592064] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   62.688153] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [   94.752164] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  126.816161] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  158.880084] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  190.944069] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  223.008141] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  255.072112] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  287.136190] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  319.200053] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  351.264164] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  383.328080] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  415.392077] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  447.456112] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  479.520128] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  511.584110] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  543.648181] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  575.712070] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17
  [  607.776178] xen:balloon: reserve_additional_memory: add_memory() failed: 
-17

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