When you look at the Hyper-V marketing page, you’ll notice that the list of supported operating systems is incomplete. If you want to know the whole support story including the recent CentOS Linux distribution that was added please go to the TechNet page, which also states end-of-support for some older Microsoft operating systems such as Windows Server 2000 with SP4 and Windows XP with SP2.

Here is the list for Linux distributions and as you can see they all have multi processor support up to the current maximum of Hyper-V R2.

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For more details go to http://technet.microsoft.com/en-us/library/cc794868(WS.10).aspx