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Its function is analogous to the memory management unit ( MMU) that maps virtual addresses to physical addresses on your CPU. ![]() For those of you who don't already know, IOMMU refers to the chipset device that maps virtual addresses to physical addresses on your I/O devices (i.e. Next, we need to determine the IOMMU groups of the graphics card we want to pass through to the VM. That way, whenever the VM isn't in use, the GPU is available to the host machine to do work on its native drivers. #CORSAIR VENGEANCE 1500 SOFTWARE 2.0.0 DRIVERS#I prefer to dynamically unbind the nvidia/amd drivers and bind the vfio drivers right before the VM starts and subsequently reversing these actions when the VM stops ( see Part 2). I found that this solution wasn't suitable for me. Most tutorials will have you add a kernel parameter called pci-stub with the PCI bus ID of your GPU to achieve this. The logic stems from the fact that since the native drivers can't attach to the GPU at boot-time, the GPU will be freed-up and available to bind to the vfio drivers instead. When planning my GPU passthrough setup, I discovered that many tutorials at this point will go ahead and have you blacklist the nvidia/amd drivers. Similarly, if your system is configured with GRUB2, you can achieve the same result by editing the /etc/default/grub file with sudo permissions and including the kernel parameter as follows:įor Intel: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_iommu=on"įor AMD: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amd_iommu=on" Since my machine uses systemd and these configuration files are often overwritten on updates, I will be using a tool called kernelstub:įor Intel: $ sudo kernelstub -add-options "intel_iommu=on"įor AMD: $ sudo kernelstub -add-options "amd_iommu=on" grub, systemd, rEFInd), you'll have to modify a specific configuration file. For our purposes, it makes the most sense to enable this feature at boot-time. Now you're going to need to pass the hardware-enabled IOMMU functionality into the kernel as a kernel parameter. Once you've booted into the host, make sure that IOMMU is enabled:Īlso check that CPU virtualization is enabled: Save any changes and restart the machine. My motherboard is unique so I had to enable a feature called SVM Mode. For AMD, look for something called AMD-Vi. For Intel processors, look for something called VT-d. You'll also need to enable CPU virtualization. #CORSAIR VENGEANCE 1500 SOFTWARE 2.0.0 INSTALL#$ sudo apt install libvirt-daemon-system libvirt-clients qemu-kvm qemu-utils virt-manager ovmf #CORSAIR VENGEANCE 1500 SOFTWARE 2.0.0 PLUS#
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