1) Make sure virtualisation is enabled etc in bios

AMD:

IOMMU = enabled
NX mode = enabled
SVM mode = enabled

INTEL:

VT-D = Enabled VT-X = Enabled

2) sudo nano /etc/default/grub

If you have AMD: amd_iommu=on iommu=pt If you have Intel: intel_iommu=on iommu=pt add to GRUB_CMDLINE_LINUX="xxxx" line

example:

GRUB_DISABLE_RECOVERY='true'
GRUB_DISABLE_SUBMENU='true'
GRUB_ENABLE_BLSCFG='true'
GRUB_TERMINAL_OUTPUT='console'
GRUB_TIMEOUT='5'
GRUB_CMDLINE_LINUX_DEFAULT='quiet splash resume=UUID=c81d7964-1d04-4441-a574-ad1c953efd54'
GRUB_DISTRIBUTOR='Nobara Linux'
GRUB_CMDLINE_LINUX="rd.driver.blacklist=nouveau modprobe.blacklist=nouveau nvidia-drm.modeset=1 amd_iommu=on iommu=pt quiet video=efifb:off"

3)sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

4) reboot

6) run this script to see if IOMMU groups are valid:

#!/bin/bash
shopt -s nullglob
for g in /sys/kernel/iommu_groups/*; do
    echo "IOMMU Group ${g##*/}:"
    for d in $g/devices/*; do
        echo -e "\t$(lspci -nns ${d##*/})"
    done;
done;

6) sudo dnf install @virtualization 7) sudo nano /etc/libvirt/libvirtd.conf

uncomment following lines:

unix_sock_group = "libvirt"
unix_sock_rw_perms = "0770"

8) add the following to end of the conf file for to make logs to troubleshoot

log_outputs="1:file:/var/log/libvirt/libvirtd.log"

9) run following commands:

sudo systemctl start libvirtd

10) sudo systemctl enable libvirtd

11) sudo nano /etc/libvirt/qemu.conf change following:

#user = "root" 
#group = "root"

to 

user = "yourusernamehere"
group = "yourusernamehere"

save then :sudo systemctl restart libvirtd

12) sudo virsh net-autostart default sudo virsh net-start default

13) Download latest stable https://github.com/virtio-win/virtio-win-pkg-scripts/blob/master/README.md (Stable virtio-win ISO) and windows 11 iso

Boot vm and install windows 11 if it asks for drivers you can select browse and choose virtio drivers to install go to amd64 folder > w11

15) Dump vbios and edit full guide : https://gitlab.com/risingprismtv/single-gpu-passthrough/-/wikis/6)-Preparation-and-placing-of-the-ROM-file

16)Open vm add hardware > PCI host device and choose both your GPU and AUDIO (ones you added to the script ) for your GPU add to the xml tab in virtual manager https://imgur.com/a/XT6VDeG

add keyboard and mouse via > add hardware > usb device. Remove spice / qxl stuff in VM

17) Download this repo : edit both vfio-startup.sh and vfio-teardown.sh scripts in hooks folder to your PCI gpu and audio ids you can get from the iommu

add this line to the XML in your virutal manager PCI GPU tab

<rom file="/var/lib/libvirt/vgabios/patched.rom"/>

(Change GP102.ROM To your rom file name)

18) if you have nvidia GPU : sudo virsh edit win10

add or edit the following lines:

  </os>
  <features>
    <acpi/>
    <apic/>
    <hyperv>
      <relaxed state='on'/>
      <vapic state='on'/>
      <spinlocks state='on' retries='8191'/>
      <vendor_id state='on' value='123456789123'/>
    </hyperv>
    <kvm>
      <hidden state='on'/>
    </kvm>
    <vmport state='off'/>
    <ioapic driver='kvm'/>

for AMD CPU:

</features>
  <cpu mode='host-passthrough' check='none'>
    <topology sockets='1' cores='6' threads='2'/>
    <feature policy='require' name='topoext'/>
  </cpu>

for intel

</features>
  <cpu mode='host-passthrough' check='none'>
    <topology sockets='1' cores='6' threads='2'/>
    <feature policy='disable' name='smep'/>
  </cpu>