Thanks to this guide: https://kaanlabs.com/simultaneous-intel-gvt-g-and-nvidia-pcie-gpu-passthrough-in-proxmox/
- In BIOS enable Intel VT-d
In /etc/modules:
# Modules required for PCIe passthrough
vfio
vfio_pci
vfio_iommu_type1
vfio_virqfd
# Modules required for Intel GVT
kvmgt
exngt
vfio_mdev
In /etc/modprobe.d/i915.conf:
options i915 enable_gvt=1
options i915 enable_guc=0
In /etc/modprobe.d/kvm.conf:
options kvm ignore_msrs=1
options kvm report_ignored_msrs=0
In /etc/modprobe.d/vfio_iommu_type1.conf:
options vfio_iommu_type1 allow_unsafe_interrupts=1
In /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on iommu=pt"
Run:
update-initramfs -u -k allupdate-grubreboot