2 ====================================
4 The virtual machine "device" also accepts the ioctls KVM_SET_DEVICE_ATTR,
5 KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same
6 struct kvm_device_attr as other devices, but targets VM-wide settings
9 The groups and attributes per virtual machine, if any, are architecture
12 1. GROUP: KVM_S390_VM_MEM_CTRL
15 1.1. ATTRIBUTE: KVM_S390_VM_MEM_ENABLE_CMMA
17 Returns: -EBUSY if a vcpu is already defined, otherwise 0
19 Enables Collaborative Memory Management Assist (CMMA) for the virtual machine.
21 1.2. ATTRIBUTE: KVM_S390_VM_MEM_CLR_CMMA
25 Clear the CMMA status for all guest pages, so any pages the guest marked
26 as unused are again used any may not be reclaimed by the host.