Why single core only on a MBP13 Core i5 w/ VMware Fusion + Win7 BootCamp Partition

1. When I boot into OS X and launch VMware Fusion running Windows7 on a 2011 MacBook Pro 13" w/ Core i5:
I see only a single core in-use in the Windows 7 CPU performance widget running VMware Fusion using Windows 7 installed in BootCamp Partition?
2. When I boot directly into Windows 7 using the BootCamp Partition on the same MacBook Pro as above:
I see all four cores in-use in the Windows 7 CPU performance widget. Why doesn't VMware fusion use all four virtual cores that the MAcBook Pro 13" Core i5 provides? Core i5 has 2 physical cores but 4 hyper-threads which appear as 4 virtual cores to the OS as I understand it.
Is this expected behavior for this config? Why can't VMware Fusion on OS X see all four virtual cores? I see that the CPU submenu is greyed out under the VM Settings menu? So it appears CPU settings can't be changed for a running VM instance?  Any suggestion and pointers would be greatly appreciated.
Thanks in advance!
Fuji Apple Pie

I think your i5 is 2-cores with 4-threads (the name virtual core for HT is just a way to get 20-35% more per physical core).
And one physical core has to be assigned to Mac.
If you had the i7 4-core / 8-threads, I can see more load balancing.
Comparison Fusion and Parallels

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