Windows 7 Read only shared drive in Win XP mode

My situation is very common and simple:
I'm running Windows XP mode within 7. I want to access a physical (non-virtual) drive with decent security precautions. As stated in Windows Virtual PC Help
However, sharing host resources poses a potential security risk because the guest operating system may not be as secure as the Windows 7 host operating system
So, I want read-only access from XP.
Besides messing with rights in XP (both cumbersome and less secure), isn't there a way to declare drives as read only from 7? Frankly, I expected to find "read only" checking boxes by the drives in options>integration.

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