IOMMU not detected and cant enable it

[mduartel]

I have been trying to enable iommu for the last 6 hours but even though I vae tried adding it to GRUB_CMDLINE_LINUX_DEFAULT and made sure that I am booting with grub and not uefi mode it still tells me that iommu is not detected when trying to add a pcie device to windows 10VM. I have followed these tutorials and none of the have helped me:
https://www.youtube.com/watch?v=BoMlfk397h0&t=2814s
https://www.reddit.com/r/homelab/comments/b5xpua/the_ultimate_beginners_guide_to_gpu_passthrough/
I have also checked that vt-d is enabled in bios and all the other settings that I have found to affect iommu

output of dmesg
root@p310prox:~# dmesg | grep -e DMAR -e IOMMU [ 0.010767] ACPI: DMAR 0x00000000B8188540 000070 (v01 INTEL EDK2 00000001 INTL 00000001) [ 0.010803] ACPI: Reserving DMAR table memory at [mem 0xb8188540-0xb81885af] [ 0.091293] DMAR: Host address width 39 [ 0.091295] DMAR: DRHD base: 0x000000fed90000 flags: 0x1 [ 0.091300] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap d2008c40660462 ecap f050da [ 0.091304] DMAR: RMRR base: 0x000000c723c000 end: 0x000000c7485fff [ 0.091309] DMAR-IR: IOAPIC id 2 under DRHD base 0xfed90000 IOMMU 0 [ 0.091311] DMAR-IR: HPET id 0 under DRHD base 0xfed90000 [ 0.091313] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping. [ 0.092781] DMAR-IR: Enabled IRQ remapping in x2apic mode


I have tried everything that i can think of can anyone help me with this please?

 

[leesteken]

What is the output of cat /proc/cmdline? Maybe your Proxmox does not use GRUB but systemd-boot instead? What is your Intel CPU and motherboard (both need to support VT-d)?