bhyve/virtio: add config option to change the subvendor

[corvink]

Summary

A Windows VM with secure boot only accepts Windows signed driver. So, it
doesn't accept the widely used VirtIO driver from Red Hat. The VM only
accepts the VritIO driver from Oracle. Instead of setting the subvendor
id of each VirtIO device separately, create a single config option to
change it.

The use case for secure boot is Windows 11. It requires secure boot.

[wanpengqian_gmail.com]

Can we have a universal PCI vendor/subvendor setting for all PCI devices instead of for particular PCI devices? other pci devices may want to change the ID/subID too. For example, if I want to fake the NVMe controller as an Intel one.

[corvink]

Thought of this approach too but it's harder for the user to patch all virtio device properly than setting a single flag.

Maybe some bhyve maintainer could give some feedback.

[f0andrey_gmail.com]

The VM only accepts the VritIO driver from Oracle

official virtio-win-0.1.221-1 not work?

[corvink]

In D36450#827795, @f0andrey_gmail.com wrote:

The VM only accepts the VritIO driver from Oracle

official virtio-win-0.1.221-1 not work?

I've tested virtio-win-0.1.185-2 which doesn't work but virtio-win-0.1.221-1 works. Thanks for the hint.