This doesn't speak directly to your live migration issue -- but
copy-and-pasting a libvirt-generated command line (as you're doing here)
and using it by hand is perilous.
As I mentioned when you asked in the IRC channel, you shouldn't be using
fd= here when starting kvm by hand -- it expects to be passed an open
file descriptor to a tap device (on fd 17, in your examples), and since
you almost certainly _don't_ have such a file descriptor in your shell,
you're setting things up for failure; in prior versions (and maybe the
current one as well), this resulted in endless looping on a select()
call returning EBADF.
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