How to Enable IOMMU

Prerequisites

Before enabling IOMMU, make sure you have:

• SSH access to your VPS
• Root or sudo privileges
• Hardware that supports IOMMU (most VPS do NOT support this)

Step 1: Check if IOMMU is Already Enabled

Connect to your VPS:

ssh hxroot@YOUR_SERVER_IP -p 22

dmesg | grep -e DMAR -e IOMMU

Step 2: Enable IOMMU in GRUB

Edit GRUB configuration:

sudo nano /etc/default/grub

Find the line GRUB_CMDLINE_LINUX_DEFAULT and add:

For Intel CPUs:

intel_iommu=on

For AMD CPUs:

amd_iommu=on

Example:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_iommu=on"

Step 3: Update GRUB and Reboot

sudo update-grub
sudo reboot

Step 4: Verify IOMMU is Enabled

After reboot, check again:

dmesg | grep -e DMAR -e IOMMU

You should see messages confirming IOMMU is active.

Check IOMMU Groups for PCI Passthrough

find /sys/kernel/iommu_groups/ -type l