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GPU Passthrough Configuration

This guide explains how GPUs are exposed to Talos nodes.

Finding GPU BDFs​

On each Proxmox host, run lspci to locate the Bus:Device.Function (BDF) for your GPU.

OpenTofu Configuration​

Add the BDFs to gpu_devices in tofu/nodes.auto.tfvars:

"work-03" = {
  machine_type = "worker"
  igpu         = true
  gpu_devices  = ["0000:03:00.0", "0000:03:00.1"]
}

The gpu_devices list is available in both tofu/variables.tf and tofu/talos/variables.tf.

Virtual Machine Definition​

tofu/talos/virtual-machines.tf attaches the devices directly:

dynamic "hostpci" {
  for_each = each.value.igpu ? toset(each.value.gpu_devices) : []
  content {
    device = hostpci.value
    pcie   = true
  }
}

Talos loads the NVIDIA drivers through system extensions, and Node Feature Discovery labels the node so the device plugin runs only on GPU nodes.

VGA Configuration for Console Access​

To ensure a working noVNC console for management while the dedicated GPU is passed through, the VM's VGA adapter is set to virtio. This allows the primary GPU to be used exclusively by the guest OS for workloads.

vga {
  type = "virtio"
}