You can just use -smp 4,cores=2 and change the numbers. It may not result in 1:1 performance scaling compared to cpu=host but it works. I tested it a few days ago and got a Cinebench score that was about ~15% less compared to different VM's running with cpu=host and all cores used. You could try...
I managed to get it working with a IvyBridge CPU (i7 3820) by setting the cpu type to IvyBridge (instead of host or core2duo) but Yosemite seems to have a fsb clock variable that needs to be set to the exact clock (all inputs are recognized multiple times and the overall OS runs slightly...
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