
With this change, a FlatView can be used even after a concurrent update has replaced it. Because we do not yet have RCU, we use a mutex to protect the small critical sections that read/write the as->current_map pointer. Accesses to the FlatView can be done outside the mutex. If a MemoryRegion will be used after the FlatView is unref-ed (or after a MemoryListener callback is returned), a reference has to be added to that MemoryRegion. memory_region_find already does it for the region that it returns. The same will be done for address_space_translate as soon as the dispatch tree is also converted to RCU-style. Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu.org - QEMU team
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