------- Comment From hasri...@in.ibm.com 2018-04-08 23:12 EDT-------
(In reply to comment #5)
> Can some one tell me this fix is made available in "-proposed" build at
> least for test to validate?

With the below kernel, I am able to boot P8 guests with 16M hugepages  -
1G backed in Host

# uname -a
Linux ltc-boston122 4.15.0-15-generic #16-Ubuntu SMP Wed Apr 4 13:57:51 UTC 
2018 ppc64le ppc64le ppc64le GNU/Linux

In guest
root@ubuntu:~# cat /proc/meminfo
HugePages_Total:      10
HugePages_Free:       10
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:      16384 kB

root@ubuntu:~# uname -a
Linux ubuntu 4.4.0-116-generic #140-Ubuntu SMP Mon Feb 12 21:22:24 UTC 2018 
ppc64le ppc64le ppc64le GNU/Linux

- Harish

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  Allow hugepage backing for "p8compat" mode kvm guests

Status in The Ubuntu-power-systems project:
  Fix Committed
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == Comment: #0 - JENIFER HOPPER <jhop...@us.ibm.com> - 2018-03-06 15:23:56 ==
  +++ This bug was initially created as a clone of Bug #165320 +++

  ---Problem Description---
  Paul Mackerras posted a patch to allow for hugepage backing of Hash guest(s) 
on a Radix host:
  " KVM: PPC: Book3S HV: Fix VRMA initialization with 2MB or 1GB memory backing 

  With a 1GB backing in the Radix host, this patch allows the Hash guest
  to boot and allocate and use 16MB hugepages if needed (since backing
  page size must be larger than guest hugepage size).

  Once this is accepted upstream we should get it included in Ubuntu so that 
p8compat guests can use hugepages. 
  Contact Information = jhop...@us.ibm.com 
  ---uname output---
  Ubuntu 18.04
  Machine Type = 5104-22C 
  A debugger is not configured
  ---Steps to Reproduce---
   Back p8compat guest w/ 1GB hugepages, see that 16MB hugepages are available 
to reserve and use inside the guest.

  == Comment: #2 - JENIFER HOPPER <jhop...@us.ibm.com> - 2018-03-07 10:43:36 ==
  The patch is now in Paul's upstream tree:

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