I believe the "uname -a" output shows that this issue was observed with
a custom, i.e. a non-Ubuntu, kernel. Could you confirm that the issue is
seen with an unmodified Ubuntu kernel?
Also, do you have a proposed (kernel?) patch that resolves this issue?
Thanks.
** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Importance: Undecided => Medium
** Package changed: sysfsutils (Ubuntu) => linux (Ubuntu)
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
** Tags added: triage-g
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https://bugs.launchpad.net/bugs/1796839
Title:
Only 64 Memory regions or dimms supported for Hotplug.
Status in The Ubuntu-power-systems project:
New
Status in linux package in Ubuntu:
New
Bug description:
== Comment: #0 - HARIHARAN T. SUNDARESH REDDY <harih...@in.ibm.com> -
2018-10-03 01:29:59 ==
Description : Hotplug is supported only for 64 dimms and the same is
controlled by the sysfs parameter
# cat /sys/module/vhost/parameters/max_mem_regions
64
However qemu supports 256 slots max. In my opinion max_mem_regions
must be >= 256.
log :
63
Device attached successfully <--- 63 times devices attached successfully,
later all attach failed.
64
error: Failed to attach device from hp_mem.xml
error: internal error: unable to execute QEMU command 'device_add': a used
vhost backend has no free memory slots left
65
error: Failed to attach device from hp_mem.xml
error: internal error: unable to execute QEMU command 'device_add': a used
vhost backend has no free memory slots left
66
error: Failed to attach device from hp_mem.xml
error: internal error: unable to execute QEMU command 'device_add': a used
vhost backend has no free memory slots left
System Details :
uname -a
Linux ltc-fvttest 4.18.5-custom #1 SMP Wed Sep 26 12:11:51 CDT 2018 ppc64le
ppc64le ppc64le GNU/Linux
root@ltc-fvttest:/home/hariharan# cat /etc/os-release
NAME="Ubuntu"
VERSION="18.10 (Cosmic Cuttlefish)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu Cosmic Cuttlefish (development branch)"
VERSION_ID="18.10"
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
VERSION_CODENAME=cosmic
UBUNTU_CODENAME=cosmic
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