Arch OVMF GPT/MBR Passthrough

I . Packages to install :

pacman -S qemu virt-manager virtviewer dnsmasq iptables ebtables

II. Configuring Host before passing through :

 modprobe -r kvm_intel
 modprobe kvm_intel nested=1

III. The script below will show you all PCI devices and their mapping to their respective IOMMU groups. If the output is blank, you do not have IOMMU enabled. 

#!/bin/bash
shopt -s nullglob
for d in /sys/kernel/iommu_groups/*/devices/*; do 
    n=${d#*/iommu_groups/*}; n=${n%%/*}
    printf 'IOMMU Group %s ' "$n"
    lspci -nns "${d##*/}"
done;

Enabling IOMMU :

You will need to add a boot load kernel option.

For Intel CPUs : intel_iommu=on

For AMD CPUs: amd_iommu=on

Example output :

IOMMU Group 30 00:1d.0 USB controller [0c03]: Intel Corporation C610/X99 series chipset USB Enhanced Host Controller #1 [8086:8d26] (rev 05)
IOMMU Group 31 00:1f.0 ISA bridge [0601]: Intel Corporation C610/X99 series chipset LPC Controller [8086:8d47] (rev 05)
IOMMU Group 31 00:1f.2 SATA controller [0106]: Intel Corporation C610/X99 series chipset 6-Port SATA Controller [AHCI mode] [8086:8d02] (rev 05)
IOMMU Group 31 00:1f.3 SMBus [0c05]: Intel Corporation C610/X99 series chipset SMBus Controller [8086:8d22] (rev 05)
IOMMU Group 32 06:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP104 [GeForce GTX 1080] [10de:1b80] (rev a1)
IOMMU Group 32 06:00.1 Audio device [0403]: NVIDIA Corporation GP104 High Definition Audio Controller [10de:10f0] (rev a1)
IOMMU Group 33 07:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP107 [GeForce GTX 1050] [10de:1c81] (rev a1)
IOMMU Group 33 07:00.1 Audio device [0403]: NVIDIA Corporation GP107GL High Definition Audio Controller [10de:0fb9] (rev a1)
IOMMU Group 34 09:00.0 USB controller [0c03]: VIA Technologies, Inc. VL805 USB 3.0 Host Controller [1106:3483] (rev 01)
IOMMU Group 35 0a:00.0 USB controller [0c03]: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller [1b21:1142]