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

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