Key Technology
CPU Virtualization Memory Virtualization Device, I/O And Ethernet Port Virtualization Live Virtual Migration
Memory Virtualization Technology
Memory virtualization is the core of computer server virtualization. As we all know, the memory of the computer determines the operating efficiency and stability of the computer system. Encapsulation technology allows memory to run well in virtual machines. This in turn enables each virtual machine to perform well. In the process of realizing computer server virtualization, memory virtualization technology and CPU virtualization technology are equally important, and the frequency of access times is also consistent with each other. The key to realizing virtualized memory is to realize reasonable management of physical memory, realize reasonable division of memory, and build a mapping relationship that is consistent with the memory address required by the virtual layer and the memory address of the computer server, so as to ensure the memory of the entire virtual layer. Access can be coherent in virtualized memory and physical memory.
Device, I/O and Network Port Virtualization Technology
In the process of computer server virtualization implementation, equipment and I/O are also the main components of the computer system, and virtualization is also required to promote server virtualization. Compared with memory virtualization, device, I/O and network port virtualization are mainly realized through professional packaging technology to provide technical support for the operation of virtual machines. It often meets the needs of virtual machines for device access and I/O requests. In the computer server virtualization platform, it lays a solid foundation for the virtualization of devices and I/O. In the specific operation, there are certain differences in the computer server of each device model, configuration, parameter, etc., but the specific realization of the computer server, the exchange of data and information between the virtual machine and the physical machine, shows the application of server virtualization technology Effect. The rational application of this technology can not only expand the application scope of computer server virtualization technology, but also greatly reduce the dependence of the information age on the underlying computer hardware. As long as a virtual platform is set up, the mutual migration on different physical machines can be realized.
Live Virtual Migration Technology
This virtual technology is basically the same as the base station soft handover mechanism. Two links are constructed in the computer server. During the actual operation of the virtual machine, the relatively complete operating environment can be quickly migrated from the Harajuku machine to the Shinjuku machine. The time required for the migration process is very short, and the user technology hardly notices any changes. In short, real-time virtual migration technology is the process of data copying, transmission and switching, which is of great significance to the maintenance of computer server hardware.
CPU virtualization technology
The physical CPU in the computer server is virtualized into a virtual CPU, the system operation can use one or more virtual CPUs at the same time, and the virtualized CPUs in the computer server system can be isolated from each other. At present, many computer operating systems are built based on the X86 architecture. In the system R&D and design, the CPU mainly involves four levels in the running process, namely Ring0, Ring1, Ring2, and Ring3. Among them, Ring0 belongs to the instruction level, which can effectively execute any instruction. For example, the modification of CPU operation is completed in Ring0. The virtualized X86 system needs to set a virtual layer between the operating system and the hardware at the same time. Ring0 can only run in the virtual layer under normal circumstances, so that some special instructions cannot directly act on the hardware. Virtualization technology can effectively execute various instructions. Advanced binary code dynamic translation machine is used in computer server virtualization, which can effectively execute both ordinary instructions and privileged instructions. The application of more advanced pre-insertion instructions directly acts on the virtual machine, and the virtual machine performs instruction translation and then performs related operations. Compared with traditional virtualization technology, this approach realizes multi-system operation, which is the current implementation of CPU virtualization. key technologies.
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