On 13 Sep 2005, at 22:37, Khoa Huynh wrote:
Thanks for your comments. The current code *does* drop the page
reference counts for those tainted-refcnt pages. Even after
getting decremented, the ref counts for these pages
are still not 0 (most are 1, some are 2, 3, or even 4).
I mean forcibly decrement them to zero and free them right there and
then. Of course, as you point out, the problem is that some of the
pages are mapped in domain0. I'm not sure how we can distinguish
tainted refcnts from genuine external references. Perhaps there's a
proper way we should be destructing the full shadow pagetables such
that the refcnts end up at zero.
-- Keir
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