Windows 10 — Arm Qcow2

Microsoft permits running Windows 10 ARM inside a virtual machine if:

The Insider Preview VHDX expires after 90–180 days. For permanent use, purchase a Windows 10 Pro license key and activate it inside the VM. The same key works for ARM64.

Save this as win10arm.sh (Linux/Mac):

#!/bin/bash
qemu-system-aarch64 \
  -M virt,highmem=off \
  -cpu host \
  -smp 4 \
  -m 4096 \
  -accel hvf \        # Use 'kvm' on Linux ARM
  -drive file=Windows10_ARM.qcow2,format=qcow2,if=virtio \
  -device virtio-net-pci,netdev=net0 \
  -netdev user,id=net0 \
  -device usb-tablet \
  -display cocoa \    # For Mac; use 'gtk' on Linux
  -bios /path/to/QEMU_EFI.fd   # UEFI for ARM

QCOW2 is the native disk image format for QEMU. Unlike raw img files, QCOW2 offers:

| Hypervisor | Host Support | ARM Emulation | QCOW2 Support | |------------|--------------|----------------|----------------| | VirtualBox | x86 only | Poor (experimental)| No | | VMware Fusion | x86 + Apple Silicon | Limited (Fusion 13+ for ARM) | No | | Parallels | Apple Silicon only | Excellent (no Linux host) | No | | QEMU | Any (Linux, macOS, Windows) | Full system emulation | Native |

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Cause: QEMU is emulating a 32-bit ARM (armhf) instead of 64-bit (aarch64).
Fix: Ensure your VM configuration explicitly says aarch64 or “ARM64”.

Guide: Windows 10 on ARM using QEMU and QCOW2

Introduction

Windows 10 on ARM is a version of Windows 10 that runs on devices with ARM-based processors, such as the Qualcomm Snapdragon 835. While it's not as widely used as the x86 version, it offers an interesting alternative for devices that require a lightweight and power-efficient operating system. QEMU (Quick Emulator) is an open-source emulator that can run Windows 10 on ARM on a variety of host platforms. QCOW2 (QEMU Copy On Write) is a virtual disk image format used by QEMU.

In this guide, we'll walk you through the process of creating a Windows 10 on ARM virtual machine using QEMU and QCOW2.

Prerequisites

Step 1: Prepare the Windows 10 on ARM ISO file

Step 2: Create a QCOW2 disk image

qemu-img create -f qcow2 windows10_arm.qcow2 64G

This command creates a 64 GB QCOW2 disk image named windows10_arm.qcow2.

Step 3: Install Windows 10 on ARM

qemu-system-arm -M virt -cpu cortex-a53 -m 2048 -smp 2 -vnc :0 -device virtio-blk-device,drive=hd0 -drive id=hd0,file=windows10_arm.qcow2,format=qcow2 -cdrom <path_to_iso_file>

Replace <path_to_iso_file> with the actual path to your Windows 10 on ARM ISO file.

Step 4: Configure the virtual machine

qemu-system-arm -M virt -cpu cortex-a53 -m 2048 -smp 2 -vnc :0 -device virtio-blk-device,drive=hd0 -drive id=hd0,file=windows10_arm.qcow2,format=qcow2

This command starts the virtual machine with the QCOW2 disk image.

Tips and Variations

Troubleshooting

Conclusion

In this guide, we've shown you how to create a Windows 10 on ARM virtual machine using QEMU and QCOW2. With these steps, you should be able to run Windows 10 on ARM on a variety of host platforms. Keep in mind that performance may vary depending on your host machine and the specific configuration you choose. Happy experimenting!

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When Apple transitioned from Intel to their own M-series chips, Boot Camp disappeared. Traditional virtualization tools like VirtualBox and VMware Fusion (legacy versions) failed because they relied on Intel VT-x.

However, QEMU, combined with the qcow2 format and Hypervisor.framework (Apple’s native hypervisor API), can run ARM64 guests at near-native speed. By installing Windows 10 ARM inside a qcow2 image, M1/M2 users can run Microsoft Office, Visual Studio, or even legacy x86 apps without dual-booting.

For daily use on Apple Silicon: UTM + Windows 10 ARM Qcow2 is the most polished solution. Performance is near-native for CPU tasks (like compiling, office work), but don't expect gaming or CAD. The Qcow2 format works perfectly with snapshots and compression, making it ideal for testing ARM Windows apps without dedicating a physical disk.

Running Windows 10 on ARM with QEMU: The QCOW2 Guide Virtualizing Windows 10 on ARM opens up a world of testing and development possibilities, especially if you're working on Apple Silicon or modern ARM-based hardware. While Microsoft often provides these images as VHDX files, converting them to QCOW2 (QEMU Copy-On-Write) is the standard for high-performance virtualization in QEMU. Why QCOW2?

The QCOW2 format is highly efficient for virtual machines. It supports features like snapshots, which let you save and restore your VM's state, and sparse allocation, meaning the file only takes up as much space as the data it contains. Step 1: Gather Your Tools To get started, you'll need the following essentials:

QEMU: The emulator itself. Install it for Windows via qemu.org or for Linux using sudo apt install qemu-system-aarch64.

Windows 10 ARM Image: Typically downloaded as a VHDX from the Windows Insider Preview page. windows 10 arm qcow2

UEFI Firmware: You'll need files like QEMU_EFI.fd and QEMU_VARS.fd to handle the ARM boot process.

VirtIO Drivers: These are critical for Windows to recognize the virtualized hardware. Download them from the Fedora Project. Step 2: Convert VHDX to QCOW2

Since the official images come in VHDX, you must convert them for best compatibility with QEMU. Open your terminal or command prompt and run:

qemu-img convert -p -O qcow2 source_image.vhdx windows10_arm.qcow2 Use code with caution. Copied to clipboard -p: Shows a progress bar. -O qcow2: Specifies the output format. Step 3: Launching the VM

With your QCOW2 image ready, you can boot the virtual machine using a command similar to this:

qemu-system-aarch64 \ -M virt \ -cpu cortex-a57 \ -smp 4 \ -m 4G \ -pflash QEMU_EFI.img \ -pflash QEMU_VARS.img \ -device virtio-gpu-pci \ -device qemu-xhci \ -device usb-kbd \ -device usb-tablet \ -drive if=none,id=system,format=qcow2,file=windows10_arm.qcow2 \ -device virtio-blk,drive=system \ -drive file=virtio-win.iso,media=cdrom,if=none,id=drivers \ -device usb-storage,drive=drivers Use code with caution. Copied to clipboard

Note: During installation, Windows may not see your disk. You will need to "Load Driver" from the VirtIO CD and navigate to the viostor/w10/ARM64 folder. Quick Optimization Tips

Snapshots: Before doing anything risky, run qemu-img snapshot -c backup windows10_arm.qcow2 to save your progress.

Accelerators: On Windows hosts, use -accel whpx or -accel haxm to significantly boost performance.

Resolution: You can change the screen resolution by hitting ESC during the TianoCore splash screen to enter the UEFI BIOS settings. Windows 10 for ARM with QEMU for Windows - dfighter1985

To run Windows 10 on ARM using a QCOW2 disk image, you typically use QEMU, an open-source emulator that supports ARM64 (AArch64) architecture. While Windows 10 ARM is often distributed as a VHDX file, converting it to QCOW2 is recommended for better stability and features like snapshotting. 1. Convert VHDX to QCOW2

If you have a Windows 10 ARM image in VHDX format (e.g., from the Windows Insider Preview), convert it using the qemu-img tool:

qemu-img convert -p -O qcow2 source_image.vhdx windows10_arm.qcow2 Use code with caution. Copied to clipboard

Recommendation: Users have reported that VHDX files can become corrupted during use, making QCOW2 a more reliable alternative. Microsoft permits running Windows 10 ARM inside a

Storage Efficiency: QCOW2 images only allocate space on the host as the guest writes data, saving physical disk space compared to raw formats. 2. Launching the VM with QEMU

To run the converted QCOW2 image, use the qemu-system-aarch64 command. A typical configuration for performance and compatibility includes: Improve Documentation for Running Windows ARM on Mac #2342

Running Windows 10 on ARM using QEMU and qcow2

Windows 10 on ARM is a version of the operating system designed for devices with ARM-based processors, such as many modern smartphones and tablets. While it's not as widely used as the x86 version, it has its own set of advantages and use cases. One way to run Windows 10 on ARM is by using QEMU, an open-source emulator, and storing the image in qcow2 format.

What is qcow2?

qcow2 is a virtual disk image format used by QEMU. It's a versatile and efficient format that supports various features like compression, encryption, and snapshots. qcow2 is widely used in virtualization environments, including cloud computing and embedded systems.

Prerequisites

To run Windows 10 on ARM using QEMU and qcow2, you'll need:

Step-by-Step Guide

qemu-img create -f qcow2 windows10_arm.qcow2 20G

This will create a 20GB qcow2 image. 3. Install Windows 10 on ARM: Install Windows 10 on ARM on the qcow2 image using the qemu-system-arm command:

qemu-system-arm -M virt -cpu cortex-a15 -m 2048 -vnc :0 -device virtio-blk-device,drive=hd0 -drive id=hd0,file=windows10_arm.qcow2,format=qcow2 -cdrom windows10_arm.iso

Replace windows10_arm.iso with the path to your Windows 10 on ARM installation ISO. 4. Boot Windows 10 on ARM: Once the installation is complete, you can boot Windows 10 on ARM using the following command:

qemu-system-arm -M virt -cpu cortex-a15 -m 2048 -vnc :0 -device virtio-blk-device,drive=hd0 -drive id=hd0,file=windows10_arm.qcow2,format=qcow2

This will start the virtual machine and display the Windows 10 on ARM desktop.

Tips and Variations

By following these steps, you can run Windows 10 on ARM using QEMU and qcow2. This can be useful for testing and development purposes, or for running Windows 10 on ARM on devices that don't natively support it. The Insider Preview VHDX expires after 90–180 days

Here’s a structured summary of relevant information regarding Windows 10 on ARM in QCOW2 format, typically used with QEMU/KVM on Linux/aarch64 hosts.

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