The virtio configuration options are inconsistent. According to this,
every options that needs virtio will select it:
# Virtio always gets selected by whoever wants it.
config VIRTIO
tristate
Note that it's not user-selectable, so any config file that tries to
set it will be ignored when kconfig loads those options. And yet we
have a whole set of options that depend on VIRTIO, like VIRTIO_CONSOLE
for example. This makes it impossible to have VIRTIO_PCI modular and
VIRTIO_CONSOLE built-in on x86_64, because:
1. VIRTIO_PCI selects VIRTIO and sets it to M
2. VIRTIO_CONSOLE gets forced to M because one of its dependencies is M
So either VIRTIO (and VIRTIO_RING) need to be user-selectable, or all
of the options that depend on VIRTIO need to be changed to select it
instead.
(For even more fun, LGUEST_GUEST on i386 forces VIRTIO, VIRTIO_RING and
VIRTIO_CONSOLE all to Y.)
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