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[Launchpad Bug Tracker <1734856@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package slof - 20151103+dfsg-1ubuntu1.1

---------------
slof (20151103+dfsg-1ubuntu1.1) xenial; urgency=medium

  * Fix boot with more than 16 disks (LP: #1734856)
    - d/p/0001-boot-do-not-concatenate-bootdev.patch
    - d/p/0002-boot-use-a-temporary-bootdev-buf.patch

 -- Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>  Mon, 18 Dec
2017 14:12:32 +0100

** Changed in: slof (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** Changed in: slof (Ubuntu Zesty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1734856

Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

Status in SLOF - Slimline Open Firmware:
  New
Status in The Ubuntu-power-systems project:
  Incomplete
Status in slof package in Ubuntu:
  Fix Released
Status in slof source package in Xenial:
  Fix Released
Status in slof source package in Zesty:
  Fix Released
Status in slof source package in Artful:
  Fix Released
Status in slof source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * Booting a KVM guest with many disks considered as potential boot device 
     fails on ppc64le

   * In detail this was an overflow, so now the processing of devices is 
     changed to use dynamic allocation which works with higher numbers of 
     devices.

  [Test Case]

   * Comment #12 has the full final testcase, not writing all that up 
     here again.

  [Regression Potential]

   * It is a change of disk processing in the slof loader for ppc64el
     - that means on one hand only ppc64el will be affected by an issue
     - OTOH there might be a disk combination not part of my or upstreams or 
       IBMs testing that might now fail with the new code (unlikely)
     - Given that the change is upstream and was provided by IBM which I 
       consider the authority on that code I think it is safe to be 
       considered.

  [Other Info]
   
   * n/a

  
  ----


  == Comment: #0 - RAHUL CHANDRAKAR <rahchand@xxxxxxxxxx> - 2017-11-28 03:40:37 ==
  ---Problem Description---
  Can't boot VM with more than 16 disks.
  It is an issue with qemu/SLOF (Bug: https://github.com/qemu/SLOF/issues/3) and it was fixed by Nikunj Amritlal Dadhnia.  He has made a patch available and it has been tested by PowerVC team.

  We need this fix in Ubuntu 16.04 and later releases.

  Machine Type = 8348-21C (P8 Habanero)

  ---Steps to Reproduce---
   Steps to recreate:
  1. Create a VM
  2. Attach 50 disks
  3. Shutdown from OS
  4. Start again and let it boot

  ---uname output---
  Linux neo160.blr.stglabs.ibm.com 4.4.0-101-generic #124-Ubuntu SMP Fri Nov 10 18:29:11 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  ---Debugger---
  A debugger is not configured

  Patch posted and awaiting response...

  http://patchwork.ozlabs.org/patch/842011/

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