s390/kvm: set guest page states to stable on re-ipl

The guest page state needs to be reset to stable for all pages
on initial program load via diagnose 0x308.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --cc arch/s390/include/asm/pgalloc.h
Simple merge

diff --cc arch/s390/kvm/diag.c
Simple merge

diff --cc arch/s390/mm/pgtable.c
Simple merge