NVHE_STACK_SHIFT
#define NVHE_STACK_SIZE (UL(1) << NVHE_STACK_SHIFT)
free_pages(per_cpu(kvm_arm_hyp_stack_base, cpu), NVHE_STACK_SHIFT - PAGE_SHIFT);
stack_base = __get_free_pages(GFP_KERNEL, NVHE_STACK_SHIFT - PAGE_SHIFT);