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VFIO Setup Guide

I play games regularly, and the sad reality is that it forces me to use Windows on my desktop. There's a Linux installation on there, but rebooting into it is such a massive interruption that I usually just move over to my laptop for programming. Working on a laptop leads to all sorts of ergonomic issues, and it felt like a massive waste to not develop on the desktop hardware I invested so much in. So after extensively researching what the VFIO community has been doing, I've deleted my Windows installation and moved all my gaming into a virtual machine on a Linux host.

Normally VMs are too slow for gaming, but thanks to a feature called VFIO you can run games at near-native performance by passing graphics cards and USB controllers directly to a virtual machine. The only requirement is that your board supports IOMMU, which most modern systems have. In this guide I'll wal

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Introduction

This is my guide for a successful PCI-Passthrough from Linux (Arch Linux) to QEMU/KVM via virt-manager and libvirtd into a Windows 10 Home guest.

NOTE: This is a guide for Intel only. I do not own an AMD machine, and will not add AMD information this guide until such time that I do, which could be never.

Hardware

Device Type	Device
CPU	Intel Core i7 7700K Quad-Core, Hyperthreading
Motherboard	Gigabyte Z270X-Gaming 5

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How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

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By default, EBPF programs will not run on WSL2 due to required kernel modules missing. The following example error is an 
indication of this problem:
  modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.19.84-microso
  ft-standard/modules.dep.bin'
  modprobe: FATAL: Module kheaders not found in directory /lib/modules/4.19.84-microsoft-standard
  chdir(/lib/modules/4.19.84-microsoft-standard/build): No such file or directory

To fix this you need to rebuild the WSL2 kernel with the missing kernel modules. The below instructions are for Ubuntu 18.04 WSL2.

1. git clone https://github.com/microsoft/WSL2-Linux-Kernel.git

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import re as _re
import json as _json

JSON_EXTENSION = '.json'

def find_json_for_file(file: Path):
    try:
        if file.with_name(file.name + JSON_EXTENSION).is_file():
            # file.jpg -> file.jpg.json
            the_json_path = file.with_name(file.name + JSON_EXTENSION)

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deb [arch=amd64,i386] http://us.archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse
deb [arch=amd64,i386] http://us.archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse
deb [arch=amd64,i386] http://us.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
deb [arch=amd64,i386] http://security.ubuntu.com/ubuntu bionic-security main restricted universe multiverse

deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic main restricted universe multiverse
deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb [arch=arm64,armhf,ppc64el,s390x] http://ports.ubuntu.com/ubuntu-ports/ bionic-security main restricted universe multiverse

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# ~/.zshrc file for zsh non-login shells.
# see /usr/share/doc/zsh/examples/zshrc for examples

setopt autocd              # change directory just by typing its name
#setopt correct            # auto correct mistakes
setopt interactivecomments # allow comments in interactive mode
setopt ksharrays           # arrays start at 0
setopt magicequalsubst     # enable filename expansion for arguments of the form ‘anything=expression’
setopt nonomatch           # hide error message if there is no match for the pattern
setopt notify              # report the status of background jobs immediately

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#!/bin/sh

if [ "$UID" -ne 0 ]; then
	echo "This script needs to be executed as root"
	exit 1
fi

vendor_id="0x3000" # Valve
product_id="0x28DE"
serial_number="$(dmidecode -s system-serial-number)" # The Steam Deck's serial number

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FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.16 as builder

ARG TARGETPLATFORM
ARG BUILDPLATFORM
ARG TARGETOS
ARG TARGETARCH

WORKDIR /app/
ADD . .
RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -ldflags="-w -s" -o yourapplication main.go