The operating system cannot access this hypervisor resource directly, and USES hypervisor calls to read or write a new entry to the global page table.
操作系统不能直接地访问这个Hypervisor资源，可以使用Hypervisor调用读取全局页表、或者向全局页表写入一个新的条目。
The hypervisor has access to the entire memory space, and maintains the memory allocated to partitions through a global partition page table.
Hypervisor可以访问整个内存空间，并且通过全局分区页表来维护分配给分区的内存。
The global partition page table consists of the mapping of PMBs to the LMBs of different partitions.
全局分区页表由不同分区的pmb到lmb的映射组成。
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