KVM: s390: only reset CMMA state if it was enabled before

There is no point in resetting the CMMA state if it was never enabled.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 641639b2fbd0..3772947ac194 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -344,6 +344,10 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
                 mutex_unlock(&kvm->lock);
                 break;
         case KVM_S390_VM_MEM_CLR_CMMA:
+                ret = -EINVAL;
+                if (!kvm->arch.use_cmma)
+                        break;
+
                 mutex_lock(&kvm->lock);
                 idx = srcu_read_lock(&kvm->srcu);
                 s390_reset_cmma(kvm->arch.gmap->mm);