Comment 0 for bug 1755979

== Comment: #0 - JENIFER HOPPER <email address hidden> - 2018-03-14 16:20:47 ==
+++ This bug was initially created as a clone of Bug #163375 +++

---Problem Description---
All KVM guest cpu utilization is being reported as sys% time in the host.
It turns out Guest time accounting (CONFIG_VIRT_CPU_ACCOUNTING_GEN) has been broken since v4.13 by commit:

commit 8b24e69fc47e43679bb29ddb481aa0e8dce2a3c5
Author: Paul Mackerras <email address hidden>
Date: Mon Jun 26 15:45:51 2017 +1000

KVM: PPC: Book3S HV: Close race with testing for signals on guest entry

---

That is now fixed and upstream accepted in Paulus' tree as git commit:

https://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc.git/commit/?h=kvm-ppc-fixes&id=61bd0f66ff92d5ce765ff9850fd3cbfec773c560
("KVM: PPC: Book3S HV: Fix guest time accounting with VIRT_CPU_ACCOUNTING_GEN")

Please include this patch in Ubuntu so that guest cpu accounting is correct.

Contact Information = <email address hidden>

---uname output---
Linux ltc-b114 4.15.0-10-generic #11-Ubuntu SMP Tue Feb 13 18:21:52 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux

Machine Type = 5104-22C

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

---Steps to Reproduce---
 Start a KVM guest, run something that generates cpu utilization in the guest, observe mpstat on the host.