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-rw-r--r--arch/s390/kvm/kvm-s390.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index fc2fe49488c0..fe2396cc0856 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -258,11 +258,43 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
return r;
}
+static int kvm_s390_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
+{
+ int ret;
+ unsigned int idx;
+ switch (attr->attr) {
+ case KVM_S390_VM_MEM_ENABLE_CMMA:
+ ret = -EBUSY;
+ mutex_lock(&kvm->lock);
+ if (atomic_read(&kvm->online_vcpus) == 0) {
+ kvm->arch.use_cmma = 1;
+ ret = 0;
+ }
+ mutex_unlock(&kvm->lock);
+ break;
+ case KVM_S390_VM_MEM_CLR_CMMA:
+ mutex_lock(&kvm->lock);
+ idx = srcu_read_lock(&kvm->srcu);
+ page_table_reset_pgste(kvm->arch.gmap->mm, 0, TASK_SIZE, false);
+ srcu_read_unlock(&kvm->srcu, idx);
+ mutex_unlock(&kvm->lock);
+ ret = 0;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ return ret;
+}
+
static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
int ret;
switch (attr->group) {
+ case KVM_S390_VM_MEM_CTRL:
+ ret = kvm_s390_mem_control(kvm, attr);
+ break;
default:
ret = -ENXIO;
break;
@@ -281,6 +313,17 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
int ret;
switch (attr->group) {
+ case KVM_S390_VM_MEM_CTRL:
+ switch (attr->attr) {
+ case KVM_S390_VM_MEM_ENABLE_CMMA:
+ case KVM_S390_VM_MEM_CLR_CMMA:
+ ret = 0;
+ break;
+ default:
+ ret = -ENXIO;
+ break;
+ }
+ break;
default:
ret = -ENXIO;
break;

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