x86-urgent-2021-03-28

 - Fix build failure on Ubuntu with new GCC packages that turn on -fcf-protection

 - Fix SME memory encryption PTE encoding bug - AFAICT the code worked on
   4K page sizes (level 1) but had the wrong shift at higher page level orders
   (level 2 and higher).

Signed-off-by: Ingo Molnar <mingo@kernel.org>