Once booted into the desktop, open the VirtIO CD-ROM drive and run the virtio-win-gt-x64.msi installer. This installs all missing drivers, including the . The guest agent allows the host operating system to gracefully shut down, reboot, and freeze filesystems for clean snapshots. 2. Disable Storage-Heavy Windows Services
Ensure you are using hardware acceleration. The QEMU command should always include -enable-kvm . In virt-manager , this is automatically set when you select "Copy host CPU configuration".
Development teams use lightweight QCOW2 images to run automated cross-platform software testing. Tools like Vagrant or Ansible can spin up a Windows 10 QCOW2 container, run code compilation tests, report results, and destroy the VM instantly. Security Research and Malware Analysis
# Inside Windows: sdelete -z c: # Then on host: qemu-img convert -O qcow2 windows10.qcow2 windows10_shrinked.qcow2 Windows 10.qcow2
This method gives you fine-grained control and is excellent for scripting.
Set the cache mode of your QCOW2 drive to none or writeback for the best IOPS performance, assuming your host machine has an uninterruptible power supply (UPS). none IO Mode: native or threads
Run the following command to boot the VM, attaching both the Windows ISO and the VirtIO driver disc: Once booted into the desktop, open the VirtIO
Proxmox VE, a popular open-source virtualization platform, also fully supports QCOW2. To import an existing Windows 10.qcow2 image:
Which specific you are targeting (e.g., vanilla KVM, Proxmox, Unraid, OpenStack)
virsh snapshot-create-as windows10 snap1 "Before update" In virt-manager , this is automatically set when
Windows does not include drivers for KVM's paravirtualized devices (virtio). You will need a driver ISO for the disk and network to function optimally. Download the latest stable virtio-win.iso from the Fedora repository.
After importing, attach the disk as a VirtIO Block device via the Proxmox web UI. 2. OpenStack Upload the image directly to Glacier/Glance image services:
The from Fedora. Windows lacks native drivers for KVM’s high-performance virtual hardware; these drivers are mandatory for the installation to recognize the virtual drive and network card. 3. Create the Target QCOW2 Virtual Disk