3 ways to run windows games on linux

For: https://www.youtube.com/watch?v=Somp8w1oZhY

My original plan was to run GTX560 for a host and GTX970 inbetween systems since that's what I've been running with for a while with PCI passthrough.

So my first problem was that I dedicate the GPU to the guest. Fix to this is to rebind it. Doing this manually with something like:

	sudo sh -c 'echo "0000:02:00.0" > /sys/bus/pci/devices/0000:02:00.0/driver/unbind'
	sudo sh -c 'echo "0000:02:00.1" > /sys/bus/pci/devices/0000:02:00.1/driver/unbind'
	sudo sh -c 'echo "0000:02:00.0" > /sys/bus/pci/drivers/nvidia/bind'
	sudo sh -c 'echo "0000:02:00.1" > /sys/bus/pci/drivers/snd_hda_intel/bind'

And a lot of checking with commands like:

	lspci -nnk -d 10de:  		<- tells if driver is bound
	lsmod|grep nvidia 			<- tells if nvidia driver is initialized and if somethings using it (number over 0)
	lsof | grep /dev/nvidia 	<- tells what is using the driver

While this does work fine to unbind vfio-pci and even nvidia if you're lucky. There are multiple pitfalls that can cause the device to end up unresponsive and requiring a reboot. Mainly if xorg attaches itself to it or nvidia_modeset gets loaded requiring it to be removed before unbinding (sudo rmmod nvidia_modeset nvidia).
Around this time I also gave up on the idea of having GTX560 be part of it since it was causing too much of a headache for rebinding. It also was probably just making the system slower with having to have older drivers.

In the end I end up avoiding manual rebinding with telling xorg to use intel iGPU for the x server:

	sudo nano /etc/X11/xorg.conf
	# Use iGPU for X Server
	Section "Device"
	    Identifier      "intel"
	    Driver          "intel"
	    BusId           "PCI:0:2:0"
	EndSection

This combined with removing the vfio-pci binding I had from before:

	# sudo nano /etc/modprobe.d/vfio.conf
	# options vfio-pci ids=10de:13c2,10de:0fbb
	# sudo mkinitcpio -p linux-vfio

I end up with no driver attaching itself to the GTX970 during bootup. Now if I want to run windows in a virtual machine vfio-pci manages to bind it by itself and clear it afterwards, same with running nvidia-xrun for DXVK later on. Only Bumblebee primusrun leaves the card with nvidia driver attached but it is still without nvidia_modeset so all the other options manage to rebind themselves cleanly just fine.

Now I have a gpu back to the host but there's not much to do with it except maybe NVENC for video encoding.
So I installed Bumblebee. And even though it is meant for Optimus laptops it works here aswell as a way to run opengl games.

[Bumblebee]
	https://wiki.archlinux.org/index.php/bumblebee

	sudo nano /etc/pacman.conf
		[multilib]
		Include = /etc/pacman.d/mirrorlist
	sudo pacman -Syyu

	sudo pacman -S bumblebee mesa primus lib32-primus
	sudo pacman -S lib32-virtualgl nvidia-utils lib32-nvidia-utils nvidia-dkms
	sudo pacman -S mesa-vdpau libva-mesa-driver mesa xf86-video-intel
	sudo gpasswd -a jukka bumblebee
	sudo systemctl enable bumblebeed.service
	reboot

	sudo rm /etc/X11/xorg.conf.d/20-nvidia.conf <- sddm refused to start with Bumblebee and old nvidia configs

	bumblebeed -vv

	sudo pacman -S mesa-demos
	optirun glxgears -info
	yay -S unigine-heaven
	vblank_mode=0 primusrun unigine-heaven

[Steam]
	sudo pacman -S steam steam-native-runtime

[Lutris]
	sudo pacman -S wine-staging wine-mono wine_gecko
	sudo pacman -S winetricks zenity
	sudo pacman -S lutris

	https://github.com/lutris/lutris/wiki/How-to:-DXVK
	sudo pacman -S vulkan-icd-loader lib32-vulkan-icd-loader
	yay -S vkcube-git

	https://github.com/lutris/lutris/wiki/How-to:-Esync
	ulimit -Hn
	sudo nano /etc/systemd/system.conf
		DefaultLimitNOFILE=1048576
	sudo nano /etc/systemd/user.conf
		DefaultLimitNOFILE=1048576

[Overwatch]
	https://lutris.net/games/overwatch/
	https://github.com/lutris/lutris/wiki/Game:-Blizzard-App
	yay -S ttf-ms-fonts
	sudo pacman -S lib32-gnutls lib32-libldap lib32-libgpg-error lib32-sqlite

	Steam gameservers unreachable. Was fixed for me when I installed steam on linux aswell.
	Overwatch getting stuck updating was fixed for me by removing C:\ProgramData\Battle.net https://forums.lutris.net/t/solved-cannot-install-game-from-battle-net-client/2770/4

[Nvidia-xrun]
	https://forum.manjaro.org/t/how-to-use-vulkan-on-bumblebee-a-guide-to-nvidia-xrun/56260
	yay -S nvidia-xrun
	sudo pacman -S openbox obmenu
	nano ~/.nvidia-xinitrc
		openbox-session
	nvidia-xrun

[Looking glass]
	I already had a working PCI passthrough/Looking glass installation but for those interested:
	PCI passthrough page on archwiki has very in depth guide on passthrough; https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF
	And looking glass' own website is very straightforward aswell: https://looking-glass.hostfission.com/quickstart

Other might be useful sites:
https://arseniyshestakov.com/2016/03/31/how-to-pass-gpu-to-vm-and-back-without-x-restart/
https://linuxconfig.org/improve-your-wine-gaming-on-linux-with-dxvk
https://www.reddit.com/r/VFIO/comments/5nqr5e/you_can_share_the_use_of_a_2nd_gpu/