Re: git: f44ff2aba2d6 - main - bhyve: Treat the COMMAND register for PCI passthru devices as emulated

Hello,

I can confirm that net/wifibox fails to operate after f44ff2aba2d6

On Wed, Aug 14, 2024 at 4:17 AM Navdeep Parhar <np@freebsd.org> wrote:
>
> On 7/31/24 7:50 AM, John Baldwin wrote:
> > The branch main has been updated by jhb:
> >
> > URL: https://cgit.FreeBSD.org/src/commit/?id=f44ff2aba2d64d1d9312cb55008dc90275ccdc04
> >
> > commit f44ff2aba2d64d1d9312cb55008dc90275ccdc04
> > Author:     John Baldwin <jhb@FreeBSD.org>
> > AuthorDate: 2024-07-31 14:50:33 +0000
> > Commit:     John Baldwin <jhb@FreeBSD.org>
> > CommitDate: 2024-07-31 14:50:33 +0000
> >
> >      bhyve: Treat the COMMAND register for PCI passthru devices as emulated
> >
> >      Don't pass through writes of the command register through to the
> >      physical device.  These registers do not need to be in sync, and in
> >      some cases (e.g. when the guest is sizing the BAR and temporarily
> >      disables decoding), the states need to diverge.
>
> This seems to break MSI-X interrupts for a device that is passed through
> to a VM.  That is, the device generates an interrupt but the driver in
> the VM never receives it.  Reverting this change fixes the problem.
>
> Regards,
> Navdeep
>
>