[Bug 290920] FreeBSD 15 Regression: BHyve PCI Passthrough Broken on 15-STABLE (No GSI/Interrupt Remapping Failure)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290920

John Baldwin <jhb@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jhb@FreeBSD.org

--- Comment #7 from John Baldwin <jhb@FreeBSD.org> ---
For PCI passthrough, there are several potential things that it would be good
to confirm:

1) Is the host an AMD system or Intel?  (I think it's AMD from some of the
comments.)

2) For the Nvidia GPU, there was a recent commit in 15:

commit effcd0ded0ef1c92bef29c1e9bbf517c97bb45b8
Author:     Corvin Köhne <corvink@FreeBSD.org>
AuthorDate: Thu Mar 17 13:11:14 2022 +0100
Commit:     Corvin Köhne <corvink@FreeBSD.org>
CommitDate: Tue Sep 16 08:55:09 2025 +0200

    bhyve: assign a valid INTPIN to NVIDIA GPUs

    When passing an NVIDIA GPU to a Linux VM, the GPU driver refuses to work
and
    complains about a missing IRQ:

    [ 77.208984] NVRM: Can't find an IRQ for your NVIDIA card!
    [ 77.212697] NVRM: Please check your BIOS settings.
    [ 77.212699] NVRM: [Plug & Play OS] should be set to NO
    [ 77.212700] NVRM: [Assign IRQ to VGA] should be set to YES
    [ 77.212702] nvidia: probe of 0000:00:07.0 failed with error -1
...

However, this commit isn't present in 14.  You could try reverting that commit
locally perhaps?

3) For the USB pass through, it would be really handy to have a full Linux
dmesg (and lspci output perhaps) inside the guest when booted under 14 vs
booted under 15.

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