QEMU boot with no progress for quite long after using the -enable-kvm option

I just wanna start a vm based on x86_64 via qemu, everything goes as expected(e.g. showing the console and login part) when I run the command below

qemu-system-x86_64 \
-nographic \
-smp 4 \
-kernel ~/Documents/linux-6.1.1/arch/x86_64/boot/bzImage \
-hda jammy_rootfs_ext4.img \
-m 4G \
-append "root=/dev/sda console=ttyS0 ignore_loglevel"

outcome:

Ubuntu 22.04.1 LTS x8664 ttyS0

x8664 login: sam
Password: 
Welcome to Ubuntu 22.04.1 LTS (GNU/Linux 6.1.1 x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

 ...

sam@x8664:~$

however the weirdest part comes when adding options -enable-kvm to the command above, which looks like this

qemu-system-x86_64 \
-nographic \
-smp 4 \
-kernel ~/Documents/linux-6.1.1/arch/x86_64/boot/bzImage \
-hda jammy_rootfs_ext4.img \
-enable-kvm \
-cpu host \
-m 4G \
-append "root=/dev/sda console=ttyS0 ignore_loglevel"

then there was no output for half of an hour before killing qemu, but the top tool showed the qemu-system-x86_64 task kept taking up the nearly full use of CPU during that time the host is a virtual machine running on VirtualBox with Ubuntu Jammy Desktop, and the intel vt has been enabled shown by the command below

sudo kvm-ok
[sudo] password for qwer: 
INFO: /dev/kvm exists
KVM acceleration can be used

Can anyone give some suggestion? Waiting any useful help!(cuz being tortured by this for weeks)