[SOLVED] help to enable iommu

[lubopetrov]

I have proxmox running on Asus Sabertooth x79 mobo with single Xeon E5-2697. I'm trying to setup Plex VM with Nvidia GPU in passthrough mode. For whatever reason appears IOMMU is not enabled. I triple checked the bios settings and everything related to virtualization of CPU is enabled. I updated to the latest bios for this particular motherboard is 4801. Here is the output of the shell:
root@pve:~# dmesg | grep -i iommu
[ 0.365685] DMAR-IR: IOAPIC id 0 under DRHD base 0xfbffc000 IOMMU 0
[ 0.365688] DMAR-IR: IOAPIC id 2 under DRHD base 0xfbffc000 IOMMU 0
[ 0.739840] iommu: Default domain type: Translated
[ 0.739840] iommu: DMA domain TLB invalidation policy: lazy mode

I followed the instructions from here: https://pve.proxmox.com/wiki/PCI_Passthrough

But when I try to add PCI device to VM I see the message that says that IOMMU is not enabled.

Please help.

 

[LeCaNo]

It seems that the mainboard doesn't support VT-d/IOMMU

https://rog.asus.com/forum/showthread.php?41388-Vt-d-IOMMU-NOT-FUNCTIONING-TUF-SABERTOOTH-X79

 

[lubopetrov]

I think this issue was caused by old bios. Now I'm with the latest and VT-d shoud be fixed

 

[lubopetrov]

I was able to solve the problem by clearing cmos, enabling/disabling vt-d and clean install of proxmox, updating it to latest and following the guide: https://pve.proxmox.com/wiki/PCI_Passthrough