That’s confusing me.
KVM cannot see a virtual console anymore? Why not? I think it could last time I checked.
Found some arbitrary screenshot online, this is what I mean: https://www.tecmint.com/wp-content/uploads/2015/02/Booting-Virtual-Machine-620x448.jpeg
That is a virtual console.
Also grub boot menu while not considered a virtual console (?) uses similar (virtual) hardware access to draw to the CLI screen as virtual console.
Just to clarify:
Virtual console is different from serial console.
(Actually non-trivial from wikipedia to guess who serial console is used nowadays in context of host reading textual output from the kernel from a KVM VM without need for a functional graphic device/driver.)
This forum thread is about virtual console only.
Serial console is really cool but entirely different thing as far as I understand. (Serial Console) Should be unrelated.
Even a flashing underscore (Debian + KVM + Whonix 16 (Flashing underscore on black screen) - #15) is a type of use of a virtual console. There can/should be more output but that isn’t an issue with the virtual console implementation. That depends on kernel parameters.
Kernel Boot Parameter Change
But would be a topic for a different forum thread.
Did you try that? Did that ever work in KVM? Does it work now?