Have anyone susscesfully passthroughed the iGPU AMD Radeon 680M to VM?

[isc30]

Hey I managed to get passthrough working in a MinisForum UM773 (Ryzen 7 7735hs) and wrote down the instructions:

https://gist.github.com/isc30/74ff0f3544c35ef81a9cedf81cb3fca8

 

[tew]

Here is the method to dump vbios which may help somebody. Compile the following code, and run as root:

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

typedef uint32_t ULONG;
typedef uint8_t UCHAR;
typedef uint16_t USHORT;

typedef struct {
    ULONG Signature;
    ULONG TableLength; // Length
    UCHAR Revision;
    UCHAR Checksum;
    UCHAR OemId[6];
    UCHAR OemTableId[8]; // UINT64  OemTableId;
    ULONG OemRevision;
    ULONG CreatorId;
    ULONG CreatorRevision;
} AMD_ACPI_DESCRIPTION_HEADER;

typedef struct {
    AMD_ACPI_DESCRIPTION_HEADER SHeader;
    UCHAR TableUUID[16]; // 0x24
    ULONG VBIOSImageOffset; // 0x34. Offset to the first GOP_VBIOS_CONTENT block from the beginning of the stucture.
    ULONG Lib1ImageOffset; // 0x38. Offset to the first GOP_LIB1_CONTENT block from the beginning of the stucture.
    ULONG Reserved[4]; // 0x3C
} UEFI_ACPI_VFCT;

typedef struct {
    ULONG PCIBus; // 0x4C
    ULONG PCIDevice; // 0x50
    ULONG PCIFunction; // 0x54
    USHORT VendorID; // 0x58
    USHORT DeviceID; // 0x5A
    USHORT SSVID; // 0x5C
    USHORT SSID; // 0x5E
    ULONG Revision; // 0x60
    ULONG ImageLength; // 0x64
} VFCT_IMAGE_HEADER;

typedef struct {
    VFCT_IMAGE_HEADER VbiosHeader;
    UCHAR VbiosContent[1];
} GOP_VBIOS_CONTENT;

int main(int argc, char** argv)
{
    FILE* fp_vfct;
    FILE* fp_vbios;
    UEFI_ACPI_VFCT* pvfct;
    char vbios_name[0x400];

    if (!(fp_vfct = fopen("/sys/firmware/acpi/tables/VFCT", "r"))) {
        perror(argv[0]);
        return -1;
    }

    if (!(pvfct = malloc(sizeof(UEFI_ACPI_VFCT)))) {
        perror(argv[0]);
        return -1;
    }

    if (sizeof(UEFI_ACPI_VFCT) != fread(pvfct, 1, sizeof(UEFI_ACPI_VFCT), fp_vfct)) {
        fprintf(stderr, "%s: failed to read VFCT header!\n", argv[0]);
        return -1;
    }

    ULONG offset = pvfct->VBIOSImageOffset;
    ULONG tbl_size = pvfct->SHeader.TableLength;

    if (!(pvfct = realloc(pvfct, tbl_size))) {
        perror(argv[0]);
        return -1;
    }

    if (tbl_size - sizeof(UEFI_ACPI_VFCT) != fread(pvfct + 1, 1, tbl_size - sizeof(UEFI_ACPI_VFCT), fp_vfct)) {
        fprintf(stderr, "%s: failed to read VFCT body!\n", argv[0]);
        return -1;
    }

    fclose(fp_vfct);

    while (offset < tbl_size) {
        GOP_VBIOS_CONTENT* vbios = (GOP_VBIOS_CONTENT*)((char*)pvfct + offset);
        VFCT_IMAGE_HEADER* vhdr = &vbios->VbiosHeader;

        if (!vhdr->ImageLength)
            break;

        snprintf(vbios_name, sizeof(vbios_name), "vbios_%x_%x.bin", vhdr->VendorID, vhdr->DeviceID);

        if (!(fp_vbios = fopen(vbios_name, "wb"))) {
            perror(argv[0]);
            return -1;
        }

        if (vhdr->ImageLength != fwrite(&vbios->VbiosContent, 1, vhdr->ImageLength, fp_vbios)) {
            fprintf(stderr, "%s: failed to dump vbios %x:%x\n", argv[0], vhdr->VendorID, vhdr->DeviceID);
            return -1;
        }

        fclose(fp_vbios);

        printf("dump vbios %x:%x to %s\n", vhdr->VendorID, vhdr->DeviceID, vbios_name);

        offset += sizeof(VFCT_IMAGE_HEADER);
        offset += vhdr->ImageLength;
    }

    return 0;
}

Many thanks for this - was the only way I could get the vbios for my HP T630 / AMD GX-420CI. All the other available scripts would simply fail, and extracting from the most recent available HP BIOS updater weirdly gave me a non-working firmware (seemingly for a slightly older hardware version).

Following the guide here for system configuration, I'm now able to do passthrough using

hostpci0: 0000:00:01,pcie=1,x-vga=1,romfile=vbios_1002_9874.bin

 

[Chris_nl]

hi, as a Minisforum UM 690 owner. I can say that the only way to passthrough the gpu requires additional bios file usage for both vm and gpu. andt it only works for win 10. for win 11 it is no go again. the main reason is minisforum locked basically every thing in the bios. no advanced virtualization support and settings in the bios. They are probably not building their own bios just rebranding things because every conversation I have tried to make with them end up in a deadend.

By the way, are you sure your device is Minisforum M600? can it be UM790? or brand not Minisforum

You can turn on advanced mode in the BIOS, that gives lots and lots of options:
To get into the advanced BIOS settings you'll need to press Alt-F5, Save and Exit, then reboot again into BIOS.

I use it to disable C6 state, without that PVE crashes the minisforum after a few hours.