The purpose of virtio-console is to create arbitrary bidirectional,
host-to-guest communication channels that bypass guest's network
stack (don't require working networking in the guest).
Could virtio-vsock be a better solution for this ? Docker's hyperkit
has an implementation, though it appears Linux guest support is very recent.
But even for
using it as the system console, it's a bit better than emulated
serial port, because the protocol supports passing console resize
events from host to guest.
It makes for an excellent serial port since it uses descriptor rings
for data transfer, but the lack of a simple polled-mode operation
(unless the emergency support is used) isn't the best for a system console.
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