QCOW2 backing files allow you to compress read-only base templates, saving massive amounts of host storage when deploying multiple XP instances. Step 1: Creating the Optimal QCOW2 Disk Image

qemu-img snapshot -l winxp.qcow2

qemu-img info winxp.qcow2

This command creates a 20GB qcow2 image file named winxp.qcow2 . The size you choose should be sufficient for Windows XP and your intended applications. While Windows XP can fit into 5GB, 10-20GB is recommended for a comfortable experience with several programs installed.

sudo dnf install qemu-kvm qemu-img libvirt virt-manager

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You can save the "state" of your XP machine before making risky changes.

Boot into Windows XP and point the "Found New Hardware Wizard" to your VirtIO driver ISO.

Windows XP is highly vulnerable to malware and configuration errors. QCOW2 allows you to take snapshots, letting you freeze a clean state of the OS and roll back instantly if something breaks.

Or use -vga std (better performance, but needs XP driver).