No problem!
Here is a typical discussion: http://moodle.org/mod/forum/discuss.php?d=146521.
If performance is a concern, why do you go for virtualisation?
Incidentally discussed in /. right now: http://slashdot.org/story/12/05/31/2224245/ask-slashdot-what-type-of-asset-would-you-not-virtualize.