[libvirt] qemu - how add -object when no numa topology

[Safka, JaroslavX]

Hi guys,
I’m trying to figure out how to generate this arg line:
“-object memory-backend-file,id=ram,mem-path=/var/lib/libvirt/qemu/,share=yes,size=14336 -numa node, memdev=ram”
without numa.

I see there are two functions which are capable of building backends:
“qemuBuildNumaArgStr” and “qemuBuildMemoryDeviceCommandLine”
The “qemuBuildNumaArgStr” I’m already using for creating backend+object when numa is enabled.
But I’m not sure how to “activate” code inside “qemuBuildMemoryDeviceCommandLine” when numa is disabled.

I found there must be (in xml) record “devices/memory” to create record def->mems. But I do not know if I should add this element into xml
or I should allocate this structure by myself. Or create duplicated function, and create arg string with “-object …” inside on my own.

This all is needed for new feature and new xml elements:
(hugepages will not be used)
<memoryBacking>
    <source type='file' path='/path/to/qemu'/>
    <access mode='shared'/>
    <allocation mode='immediate'/>
  </memoryBacking>

Many thanks for any tips or help ☺
Best regards
Jarek

PS: I’m quite new in the libvirt code/community
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