As assumed this can be triggered on x86 as well:
<maxMemory slots='4' unit='KiB'>2097152</maxMemory>
<memory unit='KiB'>524288</memory>
<currentMemory unit='KiB'>524288</currentMemory>
...
<cpu>
<numa>
<cell id='0' cpus='0' memory='524288' unit='KiB'/>
</numa>
</cpu>
hp512m.xml
<memory model='dimm'>
<target>
<size unit='KiB'>524288</size>
<node>0</node>
</target>
</memory>
root@b:~# virsh attach-device b-test hp512.xml --live
error: Failed to attach device from hp512.xml
error: this function is not supported by the connection driver:
virSecurityManagerSetMemoryLabel
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https://bugs.launchpad.net/bugs/1755153
Title:
[Ubuntu 18.04] Memory hotplug fails with error
'virSecurityManagerSetMemoryLabel'
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