v2: https://lists.nongnu.org/archive/html/qemu-devel/2018-04/msg00656.html
Changes since v2:
- rebase onto master, fixing conflicts
- add R-b's
- add a missing page_lock to page_collection_lock
- add a couple of missing assert_page_locked assertions
- add page_lock_pair, as suggested by Alex and Richard
- use a per-thread GHashTable to keep track of locked pages
- get rid of page_collection assertions, and just export
assert_no_pages_locked() [Alex: I removed your R-b.]
Thanks,
Emilio
