No iommu detected proxmox Any help is appreciated. My guess is that the Intel P55 (14. I’ve enabled VT-d in the BIOS. See Documentation for further information. With only 4 steps you have successfully activated IOMMU and can passthrough PCI to VM. If you don't have dedicated IOMMU groups, you can try moving the card to another PCI slot. ". I've follow the guide from the documentation but in the GUI it still says: "No IOMMU Hello, I have a dual socket Xeon Gold 6152 server with PROXMOX 7. Make sure you enable the corresponding setting in your BIOS for this. Not seeing "DMAR: IOMMU enabled" per the official Proxmox PCI Passthrough docs. IOMMU is not enabled (because it is all in one group *). The server persists in telling me I haven’t enabled it: What’s strange is I’m having the same issue on the old hardware I’m looking to replace. Check with cat /proc/cmdline whether intel_iommu=on is actually there. When going to add or map a PCIe device to a VM I get the error: "No IOMMU detected, please activate it. . If that's the case then it's a motherboard/BIOS issue. 1-7 installed and the system refuses to recognize that I’ve enabled IOMMU groups for hardware pass-through. You will see the line: DMAR: IOMMU enabled look like this. 5 years old) does not support VT-d, or did I . bash. Hi All, I did a clean install from Proxmox 5. 4 (using single disk ext4) to Proxmox 6 (using single disk zfs) and notice that I don’t seem to be able to get IOMMU enabled under PVE6? I followed the following instructions (as I had with PVE5. I will try to be responsive as possible. So I'm trying to enable IOMMU so I can pas trough a PCIe device. Thanks in advance! Enabling IOMMU #Edit GRUB nano /etc/default/grub #Change "GRUB_CMDLINE_LINUX_DEFAULT=" to this line below exactly Run the script below to verify if IOMMU is enabled. 4) but That looks good, but that only leaves that VT-d (Intel's name for IOMMU) is not enabled (fully) in the motherboard BIOS or not supported by the CPU or the chipset. And now, When you add a new PCI device, the notification `No IOMMU detected" has been dissapear. Usually yes - it means that iommu is not enabled working. Since your CPU (I5-7400) and the chipset (H110) (if i read that correctly) do support vt-d - maybe ask the manufacturer of the computer for a BIOS update or instructions how to enable that. 5 years old) does not support VT-d, or did I Usually yes - it means that iommu is not enabled working. If it is not there, then maybe you are booting in UEFI mode with ZFS or you did not run update-grub? To have separate IOMMU groups, your processor needs to have support for a feature called ACS (Access Control Services). fnfgscl wepnrce lzdbeva bya lkmog vsklxbc jvjuz zswyfowf jwpmaj wzwf