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------- Comment From suka@xxxxxxxxxx 2014-10-30 23:03 EDT-------
(In reply to comment #12)
> (In reply to comment #11)
> > Since I'm unsure how to setup an LPAR on our POWER8 machine (we are running
> > in NV mode), can you test the following kernel to see if it solves the issue:
> >
> > http://people.canonical.com/~arges/lp1380432/
> >
> > Thanks,
>
> Sure. I will try it out in a couple of days.

I tried this out today and it working as expected:

(cp-catalog is a simple test case posted here)
https://lkml.org/lkml/2014/10/7/86

root@ltcbrazos2-lp02:/home/guest# uname -a
Linux ltcbrazos2-lp02.austin.ibm.com 3.16.0-23-generic #30 SMP Mon Oct 20 14:04:24 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux

root@ltcbrazos2-lp02:/home/guest# ./cp-catalog 5 > /tmp/catalog-5

root@ltcbrazos2-lp02:/home/guest# ./cp-catalog 4096 > /tmp/catalog-4096

root@ltcbrazos2-lp02:/home/guest# diff /tmp/catalog-5 /tmp/catalog-4096

root@ltcbrazos2-lp02:/home/guest# ls -l !*
ls -l /tmp/catalog-5 /tmp/catalog-4096

-rw-r--r-- 1 root root 262144 Oct 30 18:51 /tmp/catalog-4096
-rw-r--r-- 1 root root 262144 Oct 30 18:51 /tmp/catalog-5

root@ltcbrazos2-lp02:/home/guest# ls /sys/bus/event_source/devices/
breakpoint  cpu  hv_24x7  hv_gpci  software  tracepoint

root@ltcbrazos2-lp02:/home/guest# ls /sys/bus/event_source/devices/hv_24x7/interface/
catalog  catalog_len  catalog_version

root@ltcbrazos2-lp02:/home/guest# cat /sys/bus/event_source/devices/hv_24x7/interface/catalog_len
262144

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https://bugs.launchpad.net/bugs/1380432

Title:
  24x7 counters: Bug in catalog_read()

Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Utopic:
  In Progress

Bug description:
  ---Problem Description---
  24x7 counters: Bug in catalog_read()
   
  ---Additional Hardware Info---
  Power8 system with support for 24x7 counters 

   Machine Type = Power8 IBM,9119-MME 
   
   
  ---Steps to Reproduce---
  cp /sys/bus/event_source/devices/hv_24x7/interface/catalog /tmp
  ls -l /tmp/catalog

  Shows a file size 0 for the /tmp/catalog.
   
  We recently discovered a bug in the upstream Linux kernel. It was 
  fixed by this patch

  https://lkml.org/lkml/2014/10/1/35

  and that patch is scheduled to be included in powerpc tree.

  When it is included, we should back port to Ubuntu 14.10 or next
  release.

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