From d74dcb7766ae8a581f95d729e1e13bd99c0d8263 Mon Sep 17 00:00:00 2001
From: QaidVoid <12017109+QaidVoid@users.noreply.github.com>
Date: Thu, 11 Mar 2021 20:31:50 +0545
Subject: [PATCH] Completely libvirtless

---
 QEMU.md | 61 ++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 41 insertions(+), 20 deletions(-)

diff --git a/QEMU.md b/QEMU.md
index 4084a13..5035e85 100644
--- a/QEMU.md
+++ b/QEMU.md
@@ -1,45 +1,62 @@
 ## PLAIN QEMU WITHOUT LIBVIRT
+### WORK IN PROGRESS
 
 Passthrough can be done with plain qemu without using libvirt. \
 The general idea of using plain qemu is to avoid managing libvirt configurations and rather use a single script.. \
-You'd still need libvirt daemon running because we're using virsh command. \
+
+Stuffs directly taken from YuriAlek's [script](https://gitlab.com/YuriAlek/vfio/-/blob/master/scripts/windows-basic.sh).
 
 Create disk image with QEMU.
 ```sh
 qemu-img create -f raw Disk.img 256G
 ```
 
-The script should be run as superuser. \
-It's possible to get it working as user but it's tricky to setup. \
-Also, it should be run from TTY..
+The script should be run as superuser.
 
 ```sh
 #!/bin/sh
 
+ULIMIT=$(ulimit -a | grep "max locked memory" | awk '{print $6}')
+
+# Replace 4 with the amount of RAM you supply to the VM (in GB)
+ULIMIT_TARGET=$((4 * 1048576 + 100000))
+
+ulimit -l $ULIMIT_TARGET
+
 # Should be run before VM starts
 function init_vm() {
 	# Stop display manager (if any exists)
 	# rc-service xdm stop
 	# systemctl stop display-manager 
-	
+	pkill -9 dwm
+
+	sleep 1
 	# Unbind EFI-framebuffer
 	echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind
 	
 	# Unload GPU modules
-	modprobe -r nvidia_drm nvidia_modeset nvidia_uvm nvidia 
+	modprobe -r nvidia_drm nvidia_modeset nvidia_uvm nvidia snd_hda_intel
 	# modprobe -r amdgpu 
 	
-	# Detach GPU from host
-	virsh nodedev-detach pci_0000_01_00_0
-	virsh nodedev-detach pci_0000_01_00_1
-	
 	# Load vfio modules
 	modprobe vfio-pci
+
+	# Bind drivers to vfio
+	echo "10de 1c03" > /sys/bus/pci/drivers/vfio-pci/new_id
+	echo "0000:01:00.0" > /sys/bus/pci/devices/0000:01:00.0/driver/unbind
+	echo "0000:01:00.0" > /sys/bus/pci/drivers/vfio-pci/bind
+	echo "10de 1c03" > /sys/bus/pci/drivers/vfio-pci/remove_id
+
+	echo "10de 10f1" > /sys/bus/pci/drivers/vfio-pci/new_id
+	echo "0000:01:00.1" > /sys/bus/pci/devices/0000:01:00.1/driver/unbind
+	echo "0000:01:00.1" > /sys/bus/pci/drivers/vfio-pci/bind
+	echo "10de 10f1" > /sys/bus/pci/drivers/vfio-pci/remove_id
 }
 
 # Start VM
 function start_vm() {
 	qemu-system-x86_64 \
+		-runas qaidvoid \
 		-nodefaults \
 		-enable-kvm \
 		-machine kernel_irqchip=on \
@@ -66,28 +83,32 @@ function stop_vm() {
 	# Unload VFIO modules
 	modprobe -r vfio-pci
 	
-	# Attach GPU to host
-	virsh nodedev-reattach pci_0000_01_00_0
-	virsh nodedev-reattach pci_0000_01_00_1
-	
-	# Bind EFI framebuffer to host
-	echo "efi-framebuffer.0" > /sys/bus/platform/drivers/efi-framebuffer/bind
-	
+	ulimit -l $ULIMIT
+
+	# Reboot system, because I have no idea how to rebind drivers
+	reboot
+
 	# Load GPU modules
 	modprobe nvidia_drm
 	modprobe nvidia_modeset
 	modprobe nvidia_uvm
 	modprobe nvidia
 	# modprobe amdgpu
+
+	# Attach GPU to host ? driver doesn't exist ? 
+	echo "0000:01:00.0" > /sys/bus/pci/devices/0000:01:00.0/driver/bind
+	echo "0000:01:00.1" > /sys/bus/pci/devices/0000:01:00.1/driver/bind
+
+	# Bind EFI framebuffer to host
+	echo "efi-framebuffer.0" > /sys/bus/platform/drivers/efi-framebuffer/bind
 	
-	# Restart Display Manager? Doesn't seem to work quite well
+	# Restart Display Manager
 	# rc-service xdm start
 	# systemctl start display-manager
-  reboot
+	# su - qaidvoid -c startx
 }
 
 init_vm
 start_vm
 stop_vm
-
 ```