Re: [RFC 1/2] virtio_console: Add support for DMA memory allocation

Hi Michael,

Exactly. Though if we just fail load it will be much less code.

Generally, using a feature bit for this is a bit of a problem though:
normally driver is expected to be able to simply ignore
a feature bit. In this case driver is required to
do something so a feature bit is not a good fit.
I am not sure what the right thing to do is.

I see - so in order to avoid the binding between driver and device
there are two options I guess. Either make virtio_dev_match() or
virtcons_probe() fail. Neither of them seems like the obvious choice.

Maybe adding a check for VIRTIO_CONSOLE_F_DMA_MEM match
between device and driver in virtcons_probe() is the lesser evil?

Regards,
Sjur