Re:_**[Help]_bhyve:_bootrom_alloc:_vm_mmap _mapseg:_Invalid_argument_—_NVIDIA_passthrough_with_C orvin's_branch_on_FreeBSD_15.0**

Thanks Corvin.

The passthrough feature appears to be working well. I appreciate the 
time and effort you've put into this. Once passed, I can use the device 
in a Debian 13 guest to execute cuda workloads. There do appear to be a 
few issues:

1) The nvidia device is always claimed as the primary GPU by the guest.
2) The guest hangs on shutdown and/or reboot. This only happens when the 
GPU is passed through.

The first issue prevents me from performing a device reset if the GPU 
gets wedged in a CUDA operation. Reboot required. The second issue 
prevents a clean reboot ( always a dirty FS at startup ). Any ideas how 
to force UEFI to prefer the virtual frame buffer device? I've tried 
everything I can think of but no luck so far.

Thanks again,

-Matthew

On 6/8/26 01:39, Corvin Köhne wrote:
> On Fri, 2026-06-05 at 11:20 -0500, Matthew Grooms wrote:
>> On 6/5/26 01:34, Corvin Köhne wrote:
>>> On Thu, 2026-06-04 at 13:23 +0200, Mario Marietto wrote:
>>>>           Hi everyone,
>>>>    I'm trying to get NVIDIA GPU passthrough working with bhyve on FreeBSD
>>>> 15.0-
>>>> RELEASE-p5, using Corvin Köhne's nvidia-wip branch:
>>>>    
>>>> https://github.com/Beckhoff/freebsd-src/tree/phab/corvink/15.0/nvidia-wip
>>>>    The VM fails to start with the following error before the guest even
>>>> boots:
>>>>    bhyve: bootrom_alloc: vm_mmap_mapseg: Invalid argument
>>> NVIDIA GPU passthrough should work with stock 15.0, no patches required.
>> I was about to attempt this myself. Are all the required patches present
>> in 14.4 as well?
>>
>> Thanks,
>>
>> -Matthew
>>
> Yes, the required patch is present in 14.4 as well.
>
>