Public bug reported:
IBM would like to have the following documented wherever appropriate:
---Problem Description---
In Ubuntu 17.04, when trying to increase the number of memory slots from 32 to
256, only 63 slots were available even though 256 slots was specified in the
guest xml.
Machine Type = POWER8
Even though 256 slots are supported in QEMU 2.8, distributed with Ubuntu
17.04, there is an implicit limit coming from the vhost backend,
limiting the number of max memory slots that are supported.
The work around is to increase the vhost mem slots by reloading the
vhost module in the guest:
[root@localhost ~]# modprobe -r vhost
[root@localhost ~]# modprobe vhost max_mem_regions=512
[root@localhost ~]# cat /sys/module/vhost/parameters/max_mem_regions
512
** Affects: ubuntu-docs (Ubuntu)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bugnameltc-151531 severity-medium
targetmilestone-inin1704
** Tags added: architecture-ppc64le bugnameltc-151531 severity-medium
targetmilestone-inin1704
** Changed in: ubuntu
Assignee: (unassigned) => Taco Screen team (taco-screen-team)
** Package changed: ubuntu => ubuntu-docs (Ubuntu)
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https://bugs.launchpad.net/bugs/1666286
Title:
Memory hot plug: increase the number of slots from '32' to '256'
(Documentation)
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