zoda...@gmail.com writes:

> Hi, 
>
> I'd like to try the memory hot unplug, refer to:
> https://www.ovirt.org/documentation/vmm-guide/chap-Editing_Virtual_Machines.html:
>
> "All blocks of the hot-plugged memory must be set to
> **online_movable** in the virtual machine’s device management
> rules. In virtual machines running up-to-date versions of Enterprise
> Linux or CoreOS, this rule is set by default."
>
> I created a VM running CentOS7.6:
> # more /etc/redhat-release
> CentOS Linux release 7.6.1810 (Core)
> # more /usr/lib/udev/rules.d/40-redhat.rules
> ...
> # Memory hotadd request
> SUBSYSTEM!="memory", ACTION!="add", GOTO="memory_hotplug_end"
> PROGRAM="/bin/uname -p", RESULT=="s390*", GOTO="memory_hotplug_end"
>
> ENV{.state}="online"
> PROGRAM="/bin/systemd-detect-virt", RESULT=="none", 
> ENV{.state}="online_movable"
> ATTR{state}=="offline", ATTR{state}="$env{.state}"
>
> LABEL="memory_hotplug_end"
>
> It looks like the online_movable will be set only when
> systemd-detect-virt returns none, i.e. hot plugging memory for a
> bare-metal machine, so how to make the hot plugged memory
> "online_movable" in the virtual machines? Thank you.

Hi, you can copy 40-redhat.rules to /etc/udev/rules.d/ and edit it to
always set memory state as online_movable.  It will override the default
file content after reboot (or udev rules reload).

Regards,
Milan

> Regards,
> -Zhen
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