way to create a vNVDIMM device at startup time is done via the
following command line options:
- -machine pc,nvdimm
+ -machine pc,nvdimm=on
-m $RAM_SIZE,slots=$N,maxmem=$MAX_SIZE
-object memory-backend-file,id=mem1,share=on,mem-path=$PATH,size=$NVDIMM_SIZE,readonly=off
-device nvdimm,id=nvdimm1,memdev=mem1,unarmed=off