Hi, i had the same issue on Alpine Linux with an Supermicro X10SLL-F. CPU is a Xeon E3-1270 V3 (a QS actually) Using that parameter worked for me!
x10:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-lts root=UUID=zzzz ro modules=sd-mod,usb-storage,ext4 quiet modules=sd-mod,usb-storage,ext4 quiet intel_iommu=on iommu=pti pci=realloc,assign-busses rootfstype=ext4