** Changed in: linux (Ubuntu Bionic)
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
Canonical Kernel Team (canonical-kernel-team)

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  Allow hugepage backing for "p8compat" mode kvm guests

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

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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