Well, there is this section in the official server guide:
https://help.ubuntu.com/lts/serverguide/virtualization.html
I changed this report to the server guide project, so the maintainers of
that guide can consider your suggestion. Thanks!
** Package changed: ubuntu-docs (Ubuntu) => serverguide
** Changed in: serverguide
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1666286
Title:
Memory hot plug: increase the number of slots from '32' to '256'
(Documentation)
Status in Ubuntu Server Guide:
New
Bug description:
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
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