KVM: s390: Refactor host cmma and pfmfi interpretation controls

use_cmma in kvm_arch means that the KVM hypervisor is allowed to use
cmma, whereas use_cmma in the mm context means cmm has been used before.
Let's rename the context one to uses_cmm, as the vm does use
collaborative memory management but the host uses the cmm assist
(interpretation facility).

Also let's introduce use_pfmfi, so we can remove the pfmfi disablement
when we activate cmma and rather not activate it in the first place.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1518779775-256056-2-git-send-email-frankja@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

3 files changed, 4 insertions, 3 deletions

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index afb0f08b8021..27918b15a8ba 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -792,6 +792,7 @@ struct kvm_arch{
         int css_support;
         int use_irqchip;
         int use_cmma;
+        int use_pfmfi;
         int user_cpu_state_ctrl;
         int user_sigp;
         int user_stsi;
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index db35c41a59d5..c639c95850e4 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -22,8 +22,8 @@ typedef struct {
         unsigned int has_pgste:1;
         /* The mmu context uses storage keys. */
         unsigned int use_skey:1;
-        /* The mmu context uses CMMA. */
-        unsigned int use_cmma:1;
+        /* The mmu context uses CMM. */
+        unsigned int uses_cmm:1;
 } mm_context_t;
 
 #define INIT_MM_CONTEXT(name)                                              \
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 65154eaa3714..d3ebfa8f8a9f 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -31,7 +31,7 @@ static inline int init_new_context(struct task_struct *tsk,
                 (current->mm && current->mm->context.alloc_pgste);
         mm->context.has_pgste = 0;
         mm->context.use_skey = 0;
-        mm->context.use_cmma = 0;
+        mm->context.uses_cmm = 0;
 #endif
         switch (mm->context.asce_limit) {
         case _REGION2_SIZE: