KSM and HugePages

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Does KSM support HugePages?  Reading the Fedora 12 feature list I notice this:
"Using huge pages for guest memory does have a downside, however - you
can no longer swap nor balloon guest memory."
However it is unclear to me if that includes KSM.

If I use 1GB HugePages and KSM (assuming this is possible), does that
mean the entire 1GB page has to match another for them to merge?  Are
there any other downsides to using them other than swapping and
ballooning?
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