Add support for --fb option (like --graphics but without X)

[intelfx]

Add support for a --fb option that starts QEMU in a graphical mode but without actually launching any graphical environment. This is intended for working with the framebuffer console (or anything else that might be run on top of such).

Additionally, this makes a few changes that synergize with the one above:

• the serial console is connected on stdout when (any) graphics are used
• a single --verbose only enables loglevel=7 and --show-boot-console
• a repeated --verbose is now required to also enable debug

[arighi]

This looks interesting, do you have any special use case / example on how to use it? Also CI isn't happy, but should be an easy fix. Thanks!

[arighi]

Why we need to accept multiple --verbose?

[arighi]

Oh I see, multiple --verbose enable debug. I think this should go in a separate PR.

[intelfx]

This looks interesting, do you have any special use case / example on how to use it?

I just made it for myself because I was trying to do something with fbcon. If you run vng --fb you get a framebuffer console in a GUI window and the kernel log on stderr.

I think this should go in a separate PR.

OK, I'll split off the --verbose changes. Do you want run: dump kernel console on stdout even if graphics are used here or in a separate PR as well?

[arighi]

This looks interesting, do you have any special use case / example on how to use it?

I just made it for myself because I was trying to do something with fbcon. If you run vng --fb you get a framebuffer console in a GUI window and the kernel log on stderr.

Ack, another nice thing to do would be to enable the required CONFIG_* options in the default config to properly support --fb, see:

virtme-ng/virtme/commands/configkernel.py

Line 196 in 951e30a

"##: Graphics support",

I think this should go in a separate PR.

OK, I'll split off the --verbose changes. Do you want run: dump kernel console on stdout even if graphics are used here or in a separate PR as well?

I think it's fine to include this commit in the current PR. Thanks!

[matttbe]

(Explicitly marking this PR as "Request Changes", because there are suggested changes.)