vm_unmap_mmio
int vm_unmap_mmio(struct vm *vm, vm_paddr_t gpa, size_t len);
vm_unmap_mmio(vmx->vm, DEFAULT_APIC_BASE, PAGE_SIZE);
error = vm_unmap_mmio(vmx->vm, DEFAULT_APIC_BASE, PAGE_SIZE);
(void)vm_unmap_mmio(vm, seg->gpa, seg->len);
error = vm_unmap_mmio(vm, seg->gpa, seg->len);