--- tags: Redhat --- # Redhat Grub Update with Iommu on ###### tags: Redhat , Grub Video Link: https://www.youtube.com/watch?v=uq3hrvxnlIs ### How to update the grub ```javascript= su grub2- [+tab] grub2-editenv list grub2-set-default 1 ``` ![](https://i.imgur.com/1AqbNjP.png) ```javascript= nano /etc/default/grub update this line with intel_iommu=on iommu=pt "GRUB_CMDLINE_LINUX="nofb splash=quiet console=tty0 ... intel_iommu=on iommu=pt" ``` ![](https://i.imgur.com/7P9fLaj.png) ```javascript= grub2-mkconfig -o /boot/grub2/grub.cfg ``` ![](https://i.imgur.com/nJOQ52v.png) ```javascript= reboot ``` ### Now check the IOMMU enabled or not ```javascript= dmesg | grep -i -e DMAR -e IOMMU ``` ### Before IOMMU=ON ![](https://i.imgur.com/nuTh0wl.jpg) ### After IOMMU=ON you can see in the screenshot IOMMU enabled ![](https://i.imgur.com/9BCnsK3.jpg)