I've seen reports for crashes under Xen on EFI machines with dom0 running kernel 4.12. Reason seem to be missing upstream patches 6c64447ec58b0bac612732303f7ab04562124587 ("x86/xen/efi: Initialize only the EFI struct members used by Xen") and 457ea3f7e97881f937136ce0ba1f29f82b9abdb0 ("efi: Process the MEMATTR table only if EFI_MEMMAP is enabled") Please consider adding those patches to (at least) the stable 4.12 tree. Thanks, Juergen