** Also affects: linux (Ubuntu Bionic)
   Importance: Medium
     Assignee: Joseph Salisbury (jsalisbury)
       Status: In Progress

** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Fix Released

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  Add support for 16g huge pages on Ubuntu 16.04.2 PowerNV

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Zesty:
  Won't Fix
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Released

Bug description:
  16G Huge Pages are not supported on PowerNV (bare metal) installations. 
Ubuntu 16.04.2 still allows 16G huge pages to be turned on.
  Contact Information = Mike Hollinger (mchol...@us.ibm.com) 
  ---uname output---
  Linux aprilmin4 4.4.0-83-generic #106-Ubuntu SMP Mon Jun 26 17:53:54 UTC 2017 
ppc64le ppc64le ppc64le GNU/Linux
  Machine Type = 8335-GTB 
  A debugger is not configured
  ---Steps to Reproduce---
   1. Add the following to the kernel boot args (either via editing the 
petitboot boot option manually, or updating /boot/grub/grub.cfg:

  default_hugepagesz=16G hugepagesz=16G hugepages=4

  2. Boot Linux
  3. Observe that the kernel believes 16G huge pages are available:
  ubuntu@aprilmin7:~$ cat /proc/meminfo | grep -i huge
  AnonHugePages:    475136 kB
  HugePages_Total:       0
  HugePages_Free:        0
  HugePages_Rsvd:        0
  HugePages_Surp:        0
  Hugepagesize:   16777216 kB
  ubuntu@aprilmin7:~$ ls /sys/devices/system/node/node0/hugepages
  hugepages-1024kB  hugepages-16384kB  hugepages-16777216kB

  Stack trace output:
  Oops output:
  System Dump Info:
    The system is not configured to capture a system dump.
  *Additional Instructions for Mike Hollinger (mchol...@us.ibm.com): 
  -Post a private note with access information to the machine that the bug is 
occuring on. 
  -Attach sysctl -a output output to the bug.

  This may be recreated on any bare metal POWER8 server with Ubuntu 16.04.2; I 
haven't checked other versions of Ubuntu.

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