Question about host CPU usage/allocation by KVM

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Greetings everybody,

Can anybody please point me to code/documentation regarding the
following questions I have:

- What does it actually mean using "-smp N" option, in terms of CPU
sharing between the host and the guest?
- How are guest CPUs mapped to host CPUs (if at all)?
- Is it possible to hard-allocate one or more CPUs to a particular
guest, preventing the host from using them?
- Is it possible to limit guest usage of host CPUs?
(- Do my questions make sense?)

I am running stock ubuntu-natty 2.6.38-8, with KVM 0.14.0.

Thanks!
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