Boot with: spectre_v2_user=off Test in qemu: qemu-system-x86_64 --enable-kvm -smp 32 -cpu host -m 4G -kernel vmlinuz-6.5.5-t2 -initrd initrd-6.5.5-t2.gz -nographic -append "console=ttyS0" Test on your system with chroot: mkdir t; cd t; gunzip ../initrd-6.5.5-t2 | cpio -i chroot . usr/local/init René Rebe