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 J

Best regards

Jarek

 

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