KVM_CAP_DIRTY_LOG_RING_ACQ_REL
kvm_has_cap(KVM_CAP_DIRTY_LOG_RING_ACQ_REL));
if (vm_check_cap(vm, KVM_CAP_DIRTY_LOG_RING_ACQ_REL))
vm_enable_cap(vm, KVM_CAP_DIRTY_LOG_RING_ACQ_REL, ring_size);
case KVM_CAP_DIRTY_LOG_RING_ACQ_REL:
case KVM_CAP_DIRTY_LOG_RING_ACQ_REL: