Windows 7qcow2 -

qemu-img check win7.qcow2

Passes the host CPU capabilities directly to the VM for maximum speed. QXL windows 7qcow2

Run QEMU with these optimized parameters: qemu-img check win7

Windows 7 was designed for physical hardware. In a VM, many services are redundant: which creates a VirtIO network adapter.

Note the -net nic,model=virtio parameter, which creates a VirtIO network adapter.