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QEMU has a -no-reboot option, which halts instead of reboots when the guest asks to reboot. This is invaluable when used with CONFIG_PANIC_TIMEOUT=-1 (and panic_on_warn), because it allows panics and warnings to be caught immediately in CI. Implement this in UML too, by way of a basic setup param. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Richard Weinberger <richard@nod.at>