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I've got an HPE DL325 server running Ubuntu 18.04.3 LTS that I'd like to use with an AMD S7150 MxGPU. I've got VirtualBox Version 6.0.14 r133895 (Qt5.9.5) installed and I've created a Ubuntu 18.04.3 LTS guest.

I've built and installed the AMD GIM v3.0 kernel driver on the host and the installed the amdgpu-pro-19.30-909144-ubuntu-18.04 radeon pro driver on the guest.

lspci shows that the host can see the AMD S7150 MxGPU

44:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XT GL [FirePro S7150]
44:02.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:02.1 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:02.2 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:02.3 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:02.4 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:02.5 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:02.6 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:02.7 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.1 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.2 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.3 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.4 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.5 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.6 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]
44:03.7 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tonga XTV GL [FirePro S7150V]

BUT, issuing this command "VBoxManage modifyvm "Ubuntu" --pciattach 44:02.0" causes the following error when I try to start the VM.

Failed to open a session for the virtual machine Ubuntu.

The configuration constructor in main failed due to a COM error. Check the release log of the VM for further details. (VERR_MAIN_CONFIG_CONSTRUCTOR_COM_ERROR).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

I don't mind doing some driver development work but if it has already been done or if there is an easy way to do it I'd like to know! Thanks