[Graphics] Help with RX460 hardware acceleration is KVM setup

Hi! I managed to get around to setup a KVM hackintosh on AMD x570 with a dedicated passthrough RX460 (Gigabyte, 4GB). However, there's no hardware acceleration in the OS. (Black dock, slow animations, slow launchpad, etc)

Here are my full specs:

• CPU: Ryzen 7 3700X (with 8 cores to the KVM)
• RAM: 23GB DDR4-3200 (with 16GB to the KVM)
• GPU: 1x NVidia RTX 2080 Super (Linux), 1x AMD RX460 4GB Gigabyte (KVM, excluded with pci-stub.ids in GRUB)
• Mobo: MSI X570 Gaming (however, KVM, so IDK if this matters)
• Audio codec: no idea, but I don't really care
• Ethernet card: Realtek of some sort, however virtualized via KVM)
• Wifi: none
• Guide: Part 1 and Part 2
• Configs: the defaults generated with the guide (however OVMF configured for 2560x1440 resolution)

EDIT: forgot to mention, I'm running Mojave 10.14.6, and the RX 460 shows up in 'About this mac'. And the title should say 'IN KVM setup'