Research On System Images Storage In Embedded Virtualization System

With the development of computer science, the performance of embedded equipmenthas been greatly improving. This provides a foundation for embedded virtualization.Embedded virtual system can reduce the application development cycle and solve safetyproblems in traditional embedded system area. There are already many companiesdeveloping their own embedded virtualization products. The current embeddedvirtualization systems store system images in NANA memory. This will cause problemssuch as lack of NAND memory space, hard to switch among the system images, theNAND easy to be damaged and so on. In the embedded platform, how to store the systemimage are the current hot research issues.Embedded virtualization NAND image management system (VNIMS) saves thesystem images in the SD card. This will help to save space of NAND memory andsimplify the process of upgrading the virtual machine. VNIMS is implemented inembedded virtualization system of SCTS&CGCL which is named as VNeo. It supportsguest OS of Android, and could run two Android systems simultaneously. VNIMS consistsof NAND image generation module, virtual machine manager file system module andvirtual machine NAND driver module. VNIMS can create NAND images, get thelocations of the NAND images and operate the NAND image. VNIMS operates the SDcard directly to save the space of VNeo hypervisor; in addition, VNIMS complete NANDimage operation by getting command in NAND driver and changing it to get data from SDcard.We do functional verification and performance evaluation in Android emulator. Theresults shows that the VNeo system using system image saving in the SD card can run twoVirtual Machines correctly. The extra costs of CPU, memory and read performance of filesystem are less than10%compared with using system image in NAND memory.