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        <title>Passing a GPU to a Proxmox VM with PCI Passthrough</title>
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            <h1>Passing a GPU to a Proxmox VM with PCI Passthrough</h1>
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          <h2>Enabling PCI Passthrough</h2>

<ol>
	<li>Log into ProxMox VE either via SSH or the web based shell</li>
	<li>Run the following commands
	<div class="codeBlock"># edit grub configuration to enable IOMMU<br />
	nano /etc/default/grub</div>
	</li>
	<li>Press CTRL+W and search for GRUB_CMDLINE_LINUX_DEFAULT=</li>
	<li>Add the following value to GRUB_CMDLINE_LINUX_DEFAULT
	<ol start="1" style="list-style-type: lower-alpha;">
		<li>If running an Intel CPU, intel_iommu=on
		<p>GRUB_CMDLINE_LINUX_DEFAULT=&quot;quiet intel_iommu=on&quot;</p>
		</li>
		<li>If running an AMD CPU, amd_iommu=on
		<p>GRUB_CMDLINE_LINUX_DEFAULT=&quot;quiet amd_iommu=on&quot;</p>
		</li>
	</ol>
	</li>
	<li>Press CTRL+O, Enter, CTRL+X to write the changes</li>
	<li>Continue with the following commands
	<div class="codeBlock"># update grub with config change<br />
	update-grub<br />
	# add vfio modules<br />
	nano /etc/modules</div>
	</li>
	<li>Add the following to the bottom of the file
	<p>vfio<br />
	vfio_iommu_type1<br />
	vfio_pci<br />
	vfio_virqfd</p>
	</li>
	<li>Press CTRL+O, Enter, CTRL+X to write the changes</li>
	<li>Continue with the following commands
	<div class="codeBlock"># IOMMU interrupt mapping<br />
	echo &quot;options vfio_iommu_type1 allow_unsafe_interrupts=1&quot; &gt; /etc/modprobe.d/iommu_unsafe_interrupts.conf<br />
	echo &quot;options kvm ignore_msrs=1&quot; &gt; /etc/modprobe.d/kvm.conf<br />
	# blacklist drivers<br />
	echo &quot;blacklist radeon&quot; &gt;&gt; /etc/modprobe.d/blacklist.conf<br />
	echo &quot;blacklist nouveau&quot; &gt;&gt; /etc/modprobe.d/blacklist.conf<br />
	echo &quot;blacklist nvidia&quot; &gt;&gt; /etc/modprobe.d/blacklist.conf<br />
	# list pci devices<br />
	lspci -v</div>
	</li>
	<li>Scroll through the output and find the GPU (usually a video and audio device associated with it) and make note of the device identifier (ex 01:00.0, 01:00.1)</li>
	<li>Continue with the following commands
	<div class="codeBlock"># output the vendor ID(s) of the devices<br />
	# replace the device identifier (01:00) as needed<br />
	lspci -n -s 01:00</div>
	</li>
	<li>Make note of the vendor ID(s) output in the format abcd:1234</li>
	<li>Continue with the following commands
	<div class="codeBlock"># replace the vendor ids from the output of the previous step as needed<br />
	echo &quot;options vfio-pci ids=1002:6611,1002:aab0 disable_vga=1&quot;&gt; /etc/modprobe.d/vfio.conf<br />
	# update initramfs<br />
	update-initramfs -u<br />
	# reboot proxmox host<br />
	reboot now</div>
	</li>
</ol>

<h2>Passing GPU to A VM</h2>

<ol>
	<li>Log into the ProxMox web UI</li>
	<li>Expand the target node and select the target VM from the left navigation menu</li>
	<li>Select Hardware from the left sub-navigation menu</li>
	<li>Click Add &gt; PCI Device</li>
	<li>Select the GPU from the listing<br />
	<span style="font-size:14px;"><em>NOTE: I have found that there is some trial and error required to get the GPU to work properly depending on the guest operating system. If you find that the GPU isn&#39;t working with all options checked, stop the VM, and edit the PCI hardware, unchecking one option at a time to see if you can find a working combination</em></span></li>
	<li>Select Display &gt; Set the dropdown to none (none) &gt; Click OK</li>
	<li>If you intend to use the VM at the console (not via RDP or VNC), you will need to passthrough a USB keyboard and mouse by clicking Add &gt; USB Device &gt; Select the USB device(s) or port(s) to pass to the VM</li>
	<li>Click Start at the top right of the page</li>
	<li>Watch the output of the GPU on an external display<br />
	<span style="font-size:14px;"><em>If there is no output from the GPU, stop the VM and adjust the PCI hardware options as noted above</em></span></li>
	<li>Once the VM has booted and is outputting to the GPU, install drivers for the GPU as necessary</li>
</ol>

<p>Source: <a href="https://www.reddit.com/r/homelab/comments/b5xpua/the_ultimate_beginners_guide_to_gpu_passthrough/" target="_blank">https://www.reddit.com/r/homelab/comments/b5xpua/the_ultimate_beginners_guide_to_gpu_passthrough/</a><br />
Documentation: <a href="https://pve.proxmox.com/wiki/Pci_passthrough" target="_blank">https://pve.proxmox.com/wiki/Pci_passthrough</a></p>
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