On Sat, 2022-11-12 at 23:45 +1100, Andy Bui wrote:
> The virtIO spec does not specify a need for a value when nominating a
> port as a console port, yet the virtio_console driver requires the value
> to be 1.
>
> Besides being a check that's not specified by the virtIO spec, I don't
> see anywhere else in the kernel the value is used when the corresponding
> event is VIRTIO_CONSOLE_CONSOLE_PORT. As an example QEMU also currently
> only passes in value=1 when nominating a console port.
The original virtio-console driver just had the one port, and it was,
as the name suggests, was a console port. When we converted this
console driver to a generic serial driver, the first port was kept as
the console port to not break old drivers or hypervisors. I'm afraid
we'll have to keep this bit of backward compatibility forever.
Amit
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