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QEMU

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description QEMU Overview

QEMU is an open source software project providing machine emulation capabilities. It translates computer instructions allowing users to run operating systems and applications not originally designed for their current hardware. Primarily used by developers, system administrators, and researchers needing cross-platform compatibility testing or isolated environments for development and analysis.

help QEMU FAQ

What is QEMU used for?

QEMU is used to emulate hardware and run guest operating systems, often for testing Linux, BSD, Windows, or embedded systems. It can emulate different CPU architectures, including x86, ARM, and RISC-V.

How is QEMU different from VirtualBox?

VirtualBox is mainly a desktop virtualization product, while QEMU is a lower-level emulator and virtualizer used in many tooling stacks. On Linux, QEMU is often paired with KVM for hardware-accelerated virtual machines.

Why do people use QEMU with KVM?

KVM provides Linux kernel virtualization acceleration, while QEMU provides device emulation and VM management pieces. Together they can run x86 virtual machines much faster than pure CPU emulation.

Can QEMU boot disk images from cloud providers?

Yes, QEMU can boot common disk image formats such as qcow2 and raw images, which makes it useful for cloud image testing. Developers often use it to test Linux images before uploading them to platforms like AWS or OpenStack.

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