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pc-dimm: introduce get_vmstate_memory_region callback
This callback returns the MemoryRegion that is the memory of dimm should be kept during live migration nvdimm device is different with pc-dimm as its memory includes not only the MemoryRegion directly mapping to guest's address space but also the memory used as label data Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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