related software

winapps

virsh

gnome-boxes

virt-manager

libguestfs

vagrant

virtualbox

windows guest tips

http://bkanuka.com/posts/windows-10-libvirt/

create macos virtual machine

https://github.com/foxlet/macOS-Simple-KVM

virt-manager

3d acceleration

On the guest:
sudo apt install spice-vdagent

On the host (I used void linux):
xi spice-vdagent

In the virtual machines settings:

• Change the video mode to virtio and enable 3d acceleration.
• In display spice:

Type: Spice server
Listen type: none
Password: none
OpenGL: checked, auto

libguestfs

virt-sparsify

A nice helper tool for shrinking a virtual disk.

manual sparsify

Alternatively you can 0 the data yourself. Then, reconvert the image using the following:
qemu-img convert -p -O qcow2 -c image.qcow2 image-mini.qcow2

sparsify from windows

sdelete -z C: