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QEMU with VirtIO GPU Vulkan Support

With its latest reales qemu added the Venus patches so that virtio-gpu now support venus encapsulation for vulkan. This is one more piece to the puzzle towards full Vulkan support.

An outdated blog post on clollabora described in 2021 how to enable 3D acceleration of Vulkan applications in QEMU through the Venus experimental Vulkan driver for VirtIO-GPU with a local development environment. Following up on the outdated write up, this is how its done today.

Definitions

Let's start with the brief description of the projects mentioned in the post & extend them:

VirGL for Linux KVM guests on Ubuntu Desktop

NOTE: Please don't ask for help here, it was a miracle that I got it to work at all. Seek answers in the usual places (yes, even Stackoverflow knows more than I do).

The question: How can I get 3d accelerated graphics for Linux guests in KVM without using PCI passthrough?

The short answer is: Use VirGL. The long answer is more complicated, because the VirGL project has had slow but steady progress towards actually working reliably, but the degree to which any given Linux distribution (or related driver project) is in sync has varied greatly over time. Even if it works right now, today, on your machine, it might not tomorrow. Note that even when it works, graphics performance is mediocre to downright painful.

Tested on Ubuntu Desktop 22.04.04 LTS with qemu-kvm, in an "Ubuntu on Xorg" session (not Wayland). Linux quests must have spice-vdagent installed (Ubuntu installs this by default). The hardware is a AMD 5600G d

Notes on my Arch Linux installation

Notes on my Arch Linux installation
Create the partitions

	import os
	import requests
	from bs4 import BeautifulSoup
	from urllib.parse import urljoin, urlparse
	from concurrent import futures as cfutures


	def download_file(url, base_folder):
	try:
	response = requests.get(url)

	(function() {
	// Check if there is an audio or video element on the page
	const mediaElements = document.querySelectorAll('audio, video');
	if (mediaElements.length === 0) {
	console.log('No media elements found on this page.');
	return;
	}

	// Create an AudioContext
	const audioContext = new (window.AudioContext \|\| window.webkitAudioContext)();

	// so a cool trick with macros in C (and C++) is that since macros inside of
	// macros are stille evaluated by the preprocessor, you can use macro names as
	// parameters to other macros (and even construct macro names out of out of
	// parameters!) - so using this trick if we have some macro like
	// this:

	#include <stddef.h>

	#define MY_TYPES_ITER(_F, ...) \
	_F(FOO, foo, 0, __VA_ARGS__) \

	#include <stdio.h>
	#define _USE_MATH_DEFINES
	#include <math.h>
	#include <windows.h>

	// width and height of screen
	#define ww 100
	#define wh 50

	void clr(CHAR_INFO* d)

	import psutil
	import platform
	from datetime import datetime


	def get_size(bytes, suffix="B"):
	"""
	Scale bytes to its proper format
	e.g:
	1253656 => '1.20MB'

	function replaceHome($pathArray) {
	# Check whether the first three paths are equal to HOME
	# If it is, it substitutes it for ~
	# Change this accordingly, if your home path is more than three
	# paths long.
	$splitChar = [System.IO.Path]::DirectorySeparatorChar
	if ( ($pathArray.Length -gt 2) -and
	(($pathArray[0..2] -join $splitChar) -eq $HOME)) {
	@("~") + $pathArray[3..$pathArray.Length]
	}

	[gd_scene load_steps=3 format=2]

	[sub_resource type="Shader" id=1]
	code = "shader_type canvas_item;

	// Godot Nvidia FXAA 3.11 Port

	// Usage: Drop this in to any 3D scene for FXAA! This is a port of the \"PC High Quality Preset 39\". However the medium quality
	// parameters are also included. For medium quality, just comment out sections \"PS 6\" and above and uncomment the \"med 13\" variables.