more customized qemu options

[Lerr1uqs]

[*] NOTE : run qemu now [Y/n] Y
qemu-system-x86_64: -net user: network backend 'user' is not compiled into this binary

    def make_run_script(self) -> Type["Krunner"]:
        '''example
        qemu-system-x86_64 \
            -m 256M \
            -kernel ./bzImage \
            -initrd ./initrd.modified.cpio \
            -append "console=ttyS0 oops=panic panic=1 quiet nokaslr" \
            -no-reboot \
            -smp cores=2,threads=2 \
            -cpu kvm64,+smep,+smap \
            -monitor /dev/null \
            -nographic \
            -net nic,model=virtio \
            -net user \
            -device e1000 \
            -s
        '''