I'm not
sure whether your current libvirt version supports kvm dump well.
 However, there is another method. If you LibVirt supports QMP command, try
 :
 virsh qemu-monitor-command [your vm name]'{ "execute":
"pmemsave",
 "arguments": { "val": 0, "size": [the memory size of the
vm, in KB],
 "filename": "[/path/of/the/dump]" } }' 
 I'll give this a try. Now I've googled a bit more and have found lqs2mem. This is
what I've been looking for. I'm curious if I can analyze the images. 
   Chris
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