This appears to be a request for a technical feature list or overview regarding running Windows 7 using the QCOW2 file format, specifically looking at the state of this setup in 2021.
2021 was the sunset year for practical Windows 7 virtualization. After that, driver signing certificates expired, browser support collapsed, and CVSS 9.8+ vulnerabilities went unpatched. A 2021-built Win7 qcow2 is now a digital artifact – useful only air-gapped or for nostalgic archaeology. windows 7qcow2 2021
During install:
The paper concludes by categorizing the valid reasons for maintaining these images: This appears to be a request for a
By 2021, the primary challenge of using Windows 7 is no longer performance, but security and driver compatibility. Most modern web browsers have dropped support for the OS, and many websites no longer load correctly due to outdated security certificates. However, for running legacy industrial software or testing malware in a sandbox, a Windows 7 QCOW2 image is still a powerhouse. Keep in Mind Security: Since Windows 7 is
: Windows 7 does not natively include VirtIO drivers. To achieve high performance in a QCOW2/KVM setup, you must manually load VirtIO drivers