GPU Passthrough Fedora

readme.md

Simular Guides

• (My) Perfect Gaming VM Setup with GPU Passthrough – Virtualization Server Part 14
• Configuring GPU Passthrough with VFIO on Fedora 30 notes

Usefull Commands

• lspci -nnk list pci devices
• sudo grub2-mkconfig -o /etc/grub2-efi.cfg updates the grub
• sudo call-a-friend @ballas calls the best knowledge base, fuck wiki 🤣

Detach the GPU from the host

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Retrieve the GPU id's

First you will have to find the GPU id's that you would like to passthrough, you can do this by running in the terminal:

# For AMD GPU's:
$ lspci -nnk | grep Navi

# For nvidia GPU's:
$ lspci -nnk | grep NVIDIA 

Example output, here we are interested in the VGA compatible controller (1002:73bf) and the Audio device (1002:ab28)

0a:00.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Upstream Port of PCI Express Switch [1002:1478] (rev c1)
0b:00.0 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Downstream Port of PCI Express Switch [1002:1479]
0c:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21 [Radeon RX 6800/6800 XT / 6900 XT] [1002:73bf] (rev c1)
0c:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21 HDMI Audio [Radeon RX 6800/6800 XT / 6900 XT] [1002:ab28]
	Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Navi 21 HDMI Audio [Radeon RX 6800/6800 XT / 6900 XT] [1002:ab28]

Blacklist id's and enable iommu

First you will have to modify the default grub file.

$ sudo gedit /etc/default/grub

We want to modify the GRUB_CMDLINE_LINUX

# `vfio-pci.ids` are equivalent to the id's found in the previous step.

# Explanation:
rd.driver.pre=vfio-pci       // This preloads the vfio-pci driver
intel_iommu=on               // Flags the IOMMU instruction set on Intel CPUs. If you have an AMD, amd_iommu=on is the equivalent for them.
modprobe.blacklist=nouveau   // Prevents modprobe from loading the nouveau drivers after initial boot.
rd.driver.blacklist=nouveau  // Blocks the nouveau drivers from being loaded in the ram drive before booting.
iommu=pt                     // Specifies to use “passthrough” mode for IOMMU, allowing the KVM hypervisor to directly use the device instead of relying on DMA for the device we’re giving to the VM
vfio-pci.ids                 // Binding vfio-pci via device ID

- GRUB_CMDLINE_LINUX="rhgb quiet"
+ GRUB_CMDLINE_LINUX="rhgb quiet rd.driver.blacklist=nouveau modprobe.blacklist=nouveau rd.driver.blacklist=nvidia modprobe.blacklist=nvidia intel_iommu=on iommu=pt rd.driver.pre=vfio-pci vfio-pci.ids=1002:73bf,1002:ab28"

Then we need to update grup

sudo grub2-mkconfig -o /etc/grub2-efi.cfg

We then need to edit the dracut config

$ sudo gedit /etc/dracut.conf.d/local.conf

// If anyone wondering: driver "vfio_virqfd" has been consolidated with the vfio driver so you don't need to append it in the dracut config anymore.

add_drivers+=" vfio vfio_iommu_type1 vfio_pci "

$ sudo dracut -f --kver $(uname -r)

Rebooot!

Attach the GPU from the guest

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Install Virtual Machine

$ sudo dnf groupinstall virtualization

Then you reboot 🦸

1. Open up Virtual Machine Manager
2. Create new virtual machine
3. Local install media (ISO image or CDROM) -> Select the ISO to windows10 or windows11
4. Assign Ram & CPU
5. Tick the Customize configuration before install

If you are running windows 11 you will need a secure boot and tpm module.

1. Under overview add the following config

Chipset: q35
Firmware: x86_64:/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd

2. Under CPUs, untick the copy host cpu configuration then for a example use the following config for a Ryzen 5900x

Model: host-passthrough
Topology
[X] Manually set CPU topology
Sockets: 1
Cores: 6
Threads: 2

3. Add a TPM module by clicking on Add Hardware > TPM

Model: TIS
Backend: Emulated device
Version: 2.0

4. Then passthrough the GPU and if needed the GPU Audio under the Add Hardware > PCI HOST Device

And then you can begin installation. Bobs your uncle 🤠