Hi,
I am trying to perform memory hotplug on an Ubuntu 16.04 qemu\kvm guest
and while I can successfully add memory, the added memory doesn't
automatically come online. After doing a bit of research I found out
that there is a kernel config option called
"CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE" which needs to be enabled to have
automatic onlining of hotplugged memory. However, this option is not
available on the Ubuntu 16.04 which comes with a default kernel of
4.4.0-62-generic. I can get around this issue by creating a udev rule to
online memory. I was wondering if this is a bug that needs to be reported?
#Setup info:
Host: Oracle Linux 7.4 + qemu2.9.0-3 + UEK 4.1.12-94.3.9
Guest: Ubuntu 16.04 with default kernel 4.4.0-62-generic
root@ubuntu-uefi-L1:~# cat /boot/config-4.4.0-62-generic | grep
CONFIG_MEMORY_HOTPLUG
CONFIG_MEMORY_HOTPLUG=y
CONFIG_MEMORY_HOTPLUG_SPARSE=y
This issue doesn't exist in Ubuntu 16.10 which comes with the
4.8.0-22-generic default kernel.
acompany@acompanyPC:~$ cat /boot/config-4.8.0-22-generic | grep
CONFIG_MEMORY_HOTPLUG
CONFIG_MEMORY_HOTPLUG=y
CONFIG_MEMORY_HOTPLUG_SPARSE=y
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y
Thanks,
Abbas Companywala
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