SSDT patch for macOS with VFIO GPU

// This file (after compiling with MaciASL) gets put into /EFI/Clover/ACPI/patched

DefinitionBlock ("", "SSDT", 2, "hack", "GFX", 0x00000000)
{
    External (_SB_.PCI0.PEGP, DeviceObj) // <--- This is the device that had the correct address for my passthrough GPU (0x001C0000); it just isn't correctly identified by macOS (needs GFX0 and DTGP). It may vary depending on your system configuration
    External (DTGP, MethodObj) // <--- This refers to a DTGP method added by Clover (Clover Configurator makes it easy to enable the option)

    Scope (_SB.PCI0.PEGP)
    {
        Name (_PRW, Package (0x02)
        {
            0x09,
            0x05
        })
        Device (GFX0)
        {
            Name (_ADR, Zero)
            Method (_DSM, 4, NotSerialized)
            {
                Store (Package (0x0E)
                    {
                        "@0,connector-type",
                        Buffer (0x04)
                        {
                             0x00, 0x08, 0x00, 0x00
                        },

                        "@1,connector-type",
                        Buffer (0x04)
                        {
                             0x00, 0x08, 0x00, 0x00
                        },

                        "@2,connector-type",
                        Buffer (0x04)
                        {
                             0x00, 0x08, 0x00, 0x00
                        },

                        "@3,connector-type",
                        Buffer (0x04)
                        {
                             0x00, 0x08, 0x00, 0x00
                        },

                        "@4,connector-type",
                        Buffer (0x04)
                        {
                             0x00, 0x08, 0x00, 0x00
                        },

                        "@5,connector-type",
                        Buffer (0x04)
                        {
                             0x00, 0x08, 0x00, 0x00
                        },

                        "hda-gfx",
                        Buffer (0x0A)
                        {
                            "onboard-1"
                        }
                    }, Local0)
                DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
                Return (Local0)
            }
        }
    }
}