Virtualization method of memory management unit of X86 system structure

Abstract

The invention discloses a virtualization method of a memory management unit of an X86 system structure and aims at providing a virtualization method of a memory management unit that reduces the quantity of pages of a shadow page table greatly as well as memory expense caused by the shadow page table and performance loss caused by shadow page table synchronization. The virtualization method adoptsthe following technical scheme: distributing physical memories to virtual machines; establishing and correcting an E820 table for each virtual machine; establishing a shadow page table and reverse mapping when a new page table is loaded by the virtual machine; and adopting an inertia page table updating method to correct page tables in batch according to situations if a page fault generated in a CPU is received when a new page table is not loaded by the virtual machine. By adopting the invention, the quantity of pages of the shadow page table can be greatly reduced, thereby the memory expensecaused by the shadow page table and performance loss caused by the shadow page table synchronization are reduced; and the invention further reduces the performance loss caused by the shadow page table synchronization based on the inertia page table updating method.

Description

X86 Architecture Memory Management Unit Virtualization Method technical field The invention relates to a memory management method in the field of computer architecture and operating system, in particular to a memory management unit (Memory Management Unit, MMU) virtualization method of an X86 architecture. Background technique At present, the processing power of computers continues to increase rapidly, and according to relevant statistics, the service software running on it often only uses less than 10% of the processing power during the idle period of the system, and often uses less than 50% of the processing power when the system is busy. At the same time, the energy consumption of computers continues to increase, and the consumption of electric energy has gradually become one of the main expenses of the IT industry. In addition, due to safety and reliability considerations, a large number of service providers must use multiple servers to meet the needs of data backup, r...

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Problems solved by technology

The technical problem to be solved by the present invention is: aiming at the technical problem that the current MMU virtualization method not only consumes a large amount of physical memory, but also causes the performance of the virtual machine to be greatly reduced, it provides a memory management unit virtualization method, which greatly reduces the number of shadow page table pages. number, thereby reducing the memory overhead caused by shadow page tables, and providing a lazy shadow page table update method to reduce the performance loss caused by shadow page table synchronization

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