If you have a Windows XP virtual machine in another format, like VirtualBox's VDI, it's possible to convert it to a QCOW2 image for use in QEMU or other platforms. The qemu-img command can perform this conversion seamlessly:
Windows XP does not have native drivers for the high-performance interface used by KVM. Without these, the VM relies on slow emulated IDE and network hardware.
QCOW2 supports snapshots, allowing you to save the state of your Windows XP installation and revert to it instantly if a configuration change ruins the system.
Even if you create a 20GB or 40GB virtual disk for Windows XP, the actual file on your host machine only takes up as much space as the data XP is currently using. This is ideal for lightweight legacy OSs that don't need massive initial allocations.
The image occupies only the space actually used by Windows XP, saving physical host storage.
-net nic,model=rtl8139 : Windows XP has native drivers for the Realtek 8139 network card. Optimizing Windows XP Performance in QCOW2
After configuring your software inside Windows XP, clear the OS temporary files, run a disk defragmentation, and zero out the free space. Shrink and compress the file on your host to make it highly portable:
The (if you plan to use high-performance virtualized hardware drivers). Step-by-Step Guide to Creating a Windows XP QCOW2 Image Step 1: Create the Blank QCOW2 Virtual Disk
qemu-system-i386 : Windows XP is a 32-bit architecture system (standard edition).
Because it was a VLK, it bypassed the need for online activation and could be used on an unlimited number of machines. Consequently, it became the de facto key for a huge portion of the world's pirated Windows XP installations.
You can use the qemu-img command-line tool, which is included with QEMU installations. The basic command is:
