s390/mm: use pfmf instruction to initialize storage keys

Make use of the pfmf instruction, if available, to initialize storage keys
of whole 1MB or 2GB frames instead of initializing every single page with
the sske instruction.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 4c91d078d09..1f0eee9e7da 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -374,6 +374,8 @@ static __init void detect_machine_facilities(void)
                 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
                 __ctl_set_bit(0, 23);
         }
+        if (test_facility(78))
+                S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
         if (test_facility(3))
                 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
         if (test_facility(27))