How to fix Emulator: qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.abm [bit 5]
I had the same problem on MacOS. Adding -cpu host
to qemu-system-x86_64
solved it.
For example:
qemu-system-x86_64 -m 4000 -vga virtio -accel hvf -usb -device usb -tablet -drive file=ubuntu.qcow2,if=virtio -cpu host
Solution found on github here.