From 3a801517ad49f586f2016e1b1321e6cd28a97a04 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 16 May 2014 10:34:11 +0200 Subject: [PATCH] KVM: s390: correct locking for s390_enable_skey Use the mm semaphore to serialize multiple invocations of s390_enable_skey. The second CPU faulting on a storage key operation needs to wait for the completion of the page table update. Taking the mm semaphore writable has the positive side-effect that it prevents any host faults from taking place which does have implications on keys vs PGSTE. Signed-off-by: Martin Schwidefsky Signed-off-by: Christian Borntraeger --- Reading git-format-patch failed