Another video pass-through question

[FritzGman]

Hi.

Very new to Proxmox and not a linux head.

I'm trying to pass-through an Intel iGPU (P530). CPU and MSI motherboard both support VT-d and is enabled in the BIOS but it just has not worked. "No IOMMU detected. Please activate it."

Read guides here. https://pve.proxmox.com/wiki/PCI_Passthrough - and here - https://peanut-tech.com/how-to-pass-through-intel-igpu-to-proxmox-virtual-machine/

I also searched the forum a bunch but none seem to be the problem I have.

Here are the steps I took:

1) updated grub with - GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt"
2) Ctrl + O, Ctrl + X, update-grub
3) reboot
4) updated vfio modules
vfio
vfio_iommu_type1
vfio_pci
5) update-initramfs -u -k all
6) reboot
7) dmesg | grep -e DMAR -e IOMMU - confirms DMAR:IOMMU enabled

Go to the VM to add the PCI device and ....

CPU(s) 8 x Intel(R) Xeon(R) CPU E3-1275 v5 @ 3.60GHz (1 Socket)

Kernel Version Linux 6.5.13-5-pve (2024-04-05T11:03Z)

Boot Mode EFI

Manager Version pve-manager/8.1.10/4b06efb5db453f29

Repository Status Proxmox VE updates Non production-ready repository enabled!

I just don't understand what I am doing wrong. Hoping someone can help me out. Thanks.

 

[leesteken]

As always with this weekly issue on this forum: what is the output of cat /proc/cmdline? Maybe you added it to the wrong bootloader. Did you follow the steps from the manual ?

 

[FritzGman]

As always with this weekly issue on this forum: what is the output of cat /proc/cmdline? Maybe you added it to the wrong bootloader. Did you follow the steps from the manual ?

Thought I had added that, my bad.

cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.5.13-5-pve root=/dev/mapper/pve-root ro quiet intel_iommu=on

Yes, I RTFM.

That said, I was able to resolve my issue.



The motherboard BIOS has two areas for virtualization features. First under motherboard settings to enable CPU virtualization, then secondly, VT-d was under CPU overclocking. I had missed that so it was not turned on. I only found it because I decided to check every single setting in BIOS. I knew it had to be something I missed but didn't think it was that. This is not documented in the motherboard manual. Thanks MSI.