Enable ***Intel VT-d*** or ***AMD-Vi*** in BIOS settings. \
If you can't find those virtualization options in BIOS, your hardware probably doesn't support it.
***Set the kernel paramater depending on your CPU.*** \
For GRUB user, edit grub configuration.
| /etc/default/grub |
@ -32,6 +36,22 @@ Reboot your system for the changes to take effect.
dmesg | grep 'IOMMU enabled'
```
Now, you need to make sure that your IOMMU groups are valid. \
Run the following script to view the IOMMU groups and attached devices. \
```sh
#!/bin/bash
shopt -s nullglob
for g in `find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V`; do
echo "IOMMU Group ${g##*/}:"
for d in $g/devices/*; do
echo -e "\t$(lspci -nns ${d##*/})"
done;
done;
```
During passthrough, you need to pass every device (except PCI) in the group which includes your GPU. \
You can avoid having to pass everything by using [ACS override patch](https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Bypassing_the_IOMMU_groups_(ACS_override_patch)).
### **Install required tools**
<details>
<summary><b>Gentoo Linux</b></summary>
@ -115,6 +135,10 @@ Now, click on ***Add Hardware***, select ***PCI Devices*** and add the PCI Host
### **Libvirt Hooks**
Libvirt hooks automate the process of running specific tasks during VM state change. \
More info at: [PassthroughPost](https://passthroughpo.st/simple-per-vm-libvirt-hooks-with-the-vfio-tools-hook-helper/)
**Note**: Comment Unbind/rebind EFI framebuffer line from start and stop script if you're using AMD 6000 series cards, thanks to [cdgriffith](https://github.com/cdgriffith).
Also, move the line to unbind AMD kernal module below detaching devices from host. These might also apply to older AMD cards.
QaidVoid
3 years ago
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