Getting PCI Passthrough working on G6 HP Proliant Servers with Proxmox Standard This is a quick stub post to show how I finally got PCI pass-through working on my HP DL360 G6 server, since it would show an error such as DMAR-IR: This system BIOS has enabled interrupt remapping interrupt remapping is being disabled. If you actually tried to launch a machine with a PCI device attached, it would say: Device is ineligible for IOMMU domain attach due to platform RMRR requirement. Contact your platform vendor. From what I can tell this is because the system uses RMRR to control fan speeds, and having these bits set causes the driver to disable IOMMU. There is a simple change you can make to the Proxmox kernel source code to get passed this error and use PCI devices with VMs without issue. sed -i.new 's/device_is_rmrr_locked(dev)/false/' ./$UBUNTU_NAME/drivers/iommu/intel-iommu.c After making that change and recompiling the kernel, it works perfectly fine, but the system will still say DMAR-IR interrupts have been disabled, however it will work fine. I am indebted to this Reddit post and the script that they put together that was created from their research, which let me get my DL360 G6 working. They have a DL380 but I am pleased it works on my system. I don’t have a Reddit account, but show the original author some love if you do! https://old.reddit.com/r/homelab/comments/iw5cew/proxmox_i_created_a_script_to_fix_gpu_pass/ I’ve quoted their script below just in-case the original pastebin link in their Reddit post goes down. #!/bin/bash #Proxmox 6.2 over Ubuntu Focal Fossa patch for IOMMU. #this can be done with Proxmox vanilla, just run the script! #based heavily on #https://forum.proxmox.com/threads/help-with-pci-passthrough.23980/ #move to working dir cd "${0%/*}" #Proxmox 4.4 kernel modding guide dependencies (see the above link) #apt-get install git screen fakeroot build-essential devscripts libncurses5 libncurses5-dev libssl-dev bc flex bison libelf-dev libaudit-dev libgtk2.0-dev libperl-dev libperl-dev asciidoc xmlto gnupg gnupg2 #Debian kernel build dependencies #apt-get install build-essential linux-source bc kmod cpio flex cpio libncurses5-dev #zfsonlinux has hidden dependencies #apt-get install dh-python python3-cffi python3-setuptools python3-sphinx python3-all-dev #even more dependencies #apt-get install libdw-dev libiberty-dev libnuma-dev libslang2-dev lz4 #full list of dependencies, though it may contain duplicates apt-get install git screen fakeroot build-essential devscripts libncurses5 libncurses5-dev libssl-dev bc flex bison libelf-dev libaudit-dev libgtk2.0-dev libperl-dev libperl-dev asciidoc xmlto gnupg gnupg2 build-essential linux-source bc kmod cpio flex cpio libncurses5-dev dh-python python3-cffi python3-setuptools python3-sphinx python3-all-dev libdw-dev libiberty-dev libnuma-dev libslang2-dev lz4 #rm -r ./tmp/proliant-iommu-patch/ #TODO Only if the user says so on finishing compilation - Ubuntu-focal file is weird so we have to remove #rm -r ./pve-kernel #mkdir ./tmp/proliant-iommu-patch #cd ./tmp/proliant-iommu-patch #/tmp/proliant-iommu-patch/pve-kernel/patches/kernel/ git clone git://git.proxmox.com/git/pve-kernel.git #mkdir ./pve-kernel cd ./pve-kernel #use a proxmox makefile bug to only get the submodules. THIS iS A BAD IDEA make -j 2 cd ./submodules #saves the hassle of Proxmox using git on its own #git clone git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git/ #TODO UBUNTU_NAME= "$(ls | grep -m 1 ubuntu)" > used for compatibility UBUNTU_NAME="$(ls | grep -m 1 ubuntu)" echo $UBUNTU_NAME #if [ ! -d ./$UBUNTU_NAME/drivers ] #then # #git clone git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git # #git clone git://git.proxmox.com/git/mirror_$UBUNTU_NAME-kernel # git clone https://github.com/torvalds/linux.git # echo "" # #git clone $REPOSRC $LOCALREPO #else # echo $UBUNTU_NAME + " is already cloned, skipping!" # #cd $LOCALREPO # #git pull $REPOSRC #fi # #mv -T ./mirror_$UBUNTU_NAME-kernel ./$UBUNTU_NAME sed -i.new 's/device_is_rmrr_locked(dev)/false/' ./$UBUNTU_NAME/drivers/iommu/intel-iommu.c #cat ./iommu/intel-iommu.c | grep 'device_is_rmrr_locked' #named according to proxmox tutorial :) #diff -u ./iommu/intel-iommu.c ./ubuntu-focal/drivers/iommu/intel-iommu.c > ./remove_mbrr_check.patch #move back to working dir - TODO this #cd "${0%/*}" cd ../ echo "building" make find ./ -name '*.deb' -exec cp -prv '{}' '../' ';' #optional TODO ##dpkg -i *.deb #update-grub cd ../ echo " #find ./ -name '*.deb' -exec dpkg -i '{}' ';' dpkg -i *.deb update-grub echo \"=======================================================================\" echo \"Please reboot your system. Tell u/oezingle if your machine doesn't boot\" echo \"=======================================================================\" " > ./install-new-kernel.sh chmod 0777 ./install-new-kernel.sh rm -R ./pve-kernel echo "" echo "" echo "====================================================================" echo "Install all .deb files and update-grub, or run install-new-kernel.sh" echo "===================================================================="
