Repeatedly looking at varying parts of this code has lead to me accumulating a few adjustments.
1: fold p2m_mem_paging_prep()'s main if()-s 2: correct p2m_mem_paging_prep()'s error handling 3: use guest handle for XENMEM_paging_op_prep 4: add minimal lock order enforcement to p2m_mem_paging_prep() 5: move code to its dedicated source file 6: consistently use gfn_t Jan
