x86: 0.915
mistranslation: 0.784
architecture: 0.749
device: 0.719
performance: 0.702
graphic: 0.698
user-level: 0.689
semantic: 0.673
boot: 0.637
i386: 0.620
peripherals: 0.592
KVM: 0.592
kernel: 0.552
network: 0.513
risc-v: 0.505
ppc: 0.500
permissions: 0.496
VMM: 0.457
hypervisor: 0.445
arm: 0.437
virtual: 0.420
vnc: 0.419
debug: 0.417
register: 0.406
files: 0.403
socket: 0.398
TCG: 0.394
PID: 0.327
assembly: 0.175

qemu-system-x86_64 -cdrom -nographic gives no output

Running 'sudo qemu-system-x86_64 -m 2048M -cpu host -cdrom github/xvisor-bootable.iso -boot d -enable-kvm' will create a qemu window, boot to a grub prompt and then boot the xvisor binary correctly.

Once I append -nographic to the command - after the user has selected the grub boot binary, there is no further output.

I've tried various permutations with qemu options, but to no avail. It would be great to have this working as it will permit scrolling back up into the command history for reference and large data output.

QEMU emulator version 5.2.50 (v5.2.0-925-g7b09f12773)

The vga-to-serial redirection activated by -nographics works only for vgabios calls,
not for direct vga hardware access. grub2 uses the vgabios, the linux kernel doesn't.
You can edit the menu entry in grub and add "console=ttyS0" to the linux command line.