VCPUS
vm = memstress_create_vm(mode, VCPUS, guest_percpu_mem_size,
guest_num_pages = (VCPUS * guest_percpu_mem_size) >> vm->page_shift;
for (i = 0; i < VCPUS; i++)
memstress_start_vcpu_threads(VCPUS, vcpu_worker);
memstress_join_vcpu_threads(VCPUS);
for (i = 0; i < VCPUS; i++) {