![]() ![]() You just need to select a VM backup and point a host to recover the VM. Vinchin Backup & Recovery will also help simply and quickly recover VMs. Your data will be safely stored because Vinchin Backup & Recovery will verify the data to prevent ransomware. You just need to type the credentials of hosts to add them to backup system and then you can preview and select VMs on these hosts to backup them agentlessly. You don't have to type commands in Vinchin Backup & Recovery because the whole process will be completed on a user-friendly web console. Backup Virtual Machine with Vinchin Backup & Recoveryīacking up virtual machine can protect business continuity and Vinchin Backup & Recovery will let you easily backup virtual machine. (Native KVM is not supported for now) Generally speaking, it means CPU context returns to QEMU. The exit reason is captured and related command is executed.Įxit here does not always mean powering off virtual machine. This process is like booting physical virtual machine.ĥ Create vCPU and allocate space for vCPUĦ Thread goes into a loop. Ioctl(kvmfd, KVM_SET_USER_MEMORY_REGION, &mem) Ĥ Map the virtual machine image to memory. Let's see how QEMU interacts with KVM from the example of booting virtual machine:Ģ Create virtual machine and obtain the virtual machine handleģ Map memory for virtual machine and initiate PCI and signals User Mode can help boot the Linux programs that are compiled by different CPU and System Mode is used to emulate the whole system including CPU and other hardware, which makes it easy to test programs compiled on different platforms. There are mainly two modes in QEMU Emulator, User Mode and System Mode. Technically, every virtual machine is one of the courses on the host and the course (like CPU course, I/O course, etc.) executed by virtual machine is one of the threads of QEMU Emulator course. Both of their advantages can get fully utilized to improve the performance of virtual environment. while QEMU is responsible for virtualizing I/O. KVM is good at hardware resources virtualization so it is used to do the sophisticated work like virtualizing CPU, memory, etc. Therefore, in production environment, IT administrators will use KVM and QEMU Emulator to deploy virtual environment together. The performance of QEMU virtual machine is not so good as expected because QEMU Emulator is only a tool and it takes to for every command to be translated and transferred. It is like other software like Bochs, PearPC, etc., but without some features like high speed and crossing platform.With KQEMU, a closed-source accelerator, QEMU can emulate nearly the speed of real computer.īefore QEMU 1.0, KQEMU can be used to accelerate QEMU but in QEMU and the later version, it is the QEMU-KVM module that is used as the accelerator and the result is obviously better and stabler than KQEMU. This software, mainly licensed under the GNU General Public License, is compiled by Fabrice Bellard, widely used on GNU and Linux. It is QEMU Emulator that translates all kinds of commands to the real hardware. It is often used to emulate an independent virtual machine, making virtual machine think it is interacting with the real hardware, but in fact, the hardware is emulated by QEMU Emulator. ![]() QEMU Emulator is open-source freeware for emulating hardware and devices. Backup Virtual Machine with Vinchin Backup & Recovery. ![]()
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