This series of 3 patches makes it possible for guests to allocate whatever size of HPT they need from linear memory preallocated at boot, rather than being restricted to a single size of HPT (by default, 16MB) and having to use the kernel page allocator for anything else -- which in practice limits them to at most 16MB given the default value for the maximum page order. Instead of allocating many individual pieces of memory, this allocates a single contiguous area and uses a simple bitmap-based allocator to hand out pieces of it as required.
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