system/devices/virtio-pmem.rst

8 on regular (i.e non-NVDIMM) storage.
11 -------
17 How does virtio-pmem compare to the nvdimm emulation?
18 -----------------------------------------------------
20 NVDIMM emulation on regular (i.e. non-NVDIMM) host storage does not
23 on non-NVDIMM host storage.
26 -----------------
28 A virtio pmem device backed by a memory-backend-file can be created on
31     -object memory-backend-file,id=mem1,share,mem-path=./virtio_pmem.img,size=4G
32     -device virtio-pmem-pci,memdev=mem1,id=nv1
36   - "object memory-backend-file,id=mem1,share,mem-path=<image>, size=<image size>"
39   - "device virtio-pmem-pci,id=nvdimm1,memdev=mem1" creates a virtio pmem
42 Multiple virtio pmem devices can be created if multiple pairs of "-object"
43 and "-device" are provided.
46 -------
55  (qemu) object_add memory-backend-file,id=mem2,share=on,mem-path=virtio_pmem2.img,size=4G
56  (qemu) device_add virtio-pmem-pci,id=virtio_pmem2,memdev=mem2
59 ----------------------
61 Guest data persistence on non-NVDIMM requires guest userspace applications
71 -----------
73 - Real nvdimm device backend is not supported.
74 - virtio pmem hotunplug is not supported.
75 - ACPI NVDIMM features like regions/namespaces are not supported.
76 - ndctl command is not supported.