QEMU: A proper guide!

Denshi decides to make the QEMU guide that everyone else was scared of making. A Proper guide.

QEMU: https://www.qemu.org/
Commands in the video:
Installation:

Arch: sudo pacman -S qemu (optionally "qemu-arch-extra" for more architectures)
Debian/Ubuntu: sudo apt install qemu
Fedora: sudo dnf install qemu

To create a virtual image use:

qemu-img create -f qcow2 Image.img 10G

(create is to create an image, -f qcow2 sets the format to qcow2, Image.img is our final file and 10G is it's size)

Launching the VM:

qemu-system-x86_64 -enable-kvm -cdrom OS_ISO.iso -boot menu=on -drive file=Image.img -m 2G

(-enable-kvm enables KVM, -cdrom selects an iso to load as a cd, -boot menu=on enables a boot menu, -drive file= selects a file for the drive, -m sets the amount of dedicated RAM)
(Remember! Ctrl + Alt + G to exit capture, Ctrl + Alt + F to fullscreen!)

That doesn't run so good, what can we do to improve it?

Basic performance options

-cpu host (sets the CPU to the hosts' CPU)
-smp 2 (sets the numbers of cores)

Basic Graphics Acceleration

the -vga option can be used to specify one of various vga card emulators:

"qxl" offers 2D acceleration but requires kernel modules "qxl" and "bochs_drm" to be enabled:

-vga qxl

"virtio" works much better and supports some 3D emulation:

-vga virtio -display sdl,gl=on

•Site: https://denshi.org