PCI passthrough allows you to use a physical PCI device (graphics card, network card) inside a VM (KVM virtualization only).

If you “PCI passthrough” a device, the device is not available to the host anymore.

The hardware should, at the very least, support: VT-d, interrupt mapping, and UEFI BIOS.

There are multiple steps needed. Do these in the following order.

• Configure Proxmox
• Configure VM

https://pve.proxmox.com/wiki/PCI(e)_Passthrough

https://passthroughpo.st/explaining-csm-efifboff-setting-boot-gpu-manually/

https://www.reddit.com/r/VFIO/