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A virtio pmem device backed by a memory-backend-file can be created on
- the QEMU command line as in the following example:
+ the QEMU command line as in the following example::
- -object memory-backend-file,id=mem1,share,mem-path=./virtio_pmem.img,size=4G
- -device virtio-pmem-pci,memdev=mem1,id=nv1
+ -object memory-backend-file,id=mem1,share,mem-path=./virtio_pmem.img,size=4G
+ -device virtio-pmem-pci,memdev=mem1,id=nv1
- where:
- - "object memory-backend-file,id=mem1,share,mem-path=<image>, size=<image size>"
- creates a backend file with the specified size.
+ where:
- - "device virtio-pmem-pci,id=nvdimm1,memdev=mem1" creates a virtio pmem
- pci device whose storage is provided by above memory backend device.
+ - "object memory-backend-file,id=mem1,share,mem-path=<image>, size=<image size>"
+ creates a backend file with the specified size.
+
+ - "device virtio-pmem-pci,id=nvdimm1,memdev=mem1" creates a virtio pmem
+ pci device whose storage is provided by above memory backend device.
Multiple virtio pmem devices can be created if multiple pairs of "-object"
and "-device" are provided.
pmem device can be added via 'device_add'.
For example, the following commands add another 4GB virtio pmem device to
-the guest:
+the guest::
(qemu) object_add memory-backend-file,id=mem2,share=on,mem-path=virtio_pmem2.img,size=4G
(qemu) device_add virtio-pmem-pci,id=virtio_pmem2,memdev=mem2