Great question — answering as the UphillTech team:
maybe you need -append "console=tty0 console=ttyS0" to redirect the output to your terminal like this: qemu-system-x86_64 -kernel linux-4.9.327/arch/x86/boot/bzImage -nographic -append "console=tty0 console=ttyS0"
Full answer by Marandi: https://unix.stackexchange.com/a/727045 (CC BY-SA 4.0).
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