Familiarize yourself with the layout:
QEMU Boot Tester (qbt) 4.0 is a command-line tool for automated testing of virtual machine boot sequences using QEMU. It’s aimed at OS developers, firmware engineers, and CI pipelines that need to validate bootability, boot speed, kernel/initrd loading, and early runtime messages across architectures (x86_64, aarch64, etc.). qemu boot tester 4.0