1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * xen-stub.c - stub drivers to reserve space for Xen 4 * 5 * Copyright (C) 2012 Intel Corporation 6 * Author: Liu Jinsong <jinsong.liu@intel.com> 7 * Author: Jiang Yunhong <yunhong.jiang@intel.com> 8 * 9 * Copyright (C) 2012 Oracle Inc 10 * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 11 */ 12 13#include <linux/kernel.h> 14#include <linux/init.h> 15#include <linux/export.h> 16#include <linux/types.h> 17#include <linux/acpi.h> 18#include <xen/acpi.h> 19 20#ifdef CONFIG_ACPI 21 22/*-------------------------------------------- 23 stub driver for Xen memory hotplug 24--------------------------------------------*/ 25 26static const struct acpi_device_id memory_device_ids[] = { 27 {ACPI_MEMORY_DEVICE_HID, 0}, 28 {"", 0}, 29}; 30 31static struct acpi_driver xen_stub_memory_device_driver = { 32 /* same name as native memory driver to block native loaded */ 33 .name = "acpi_memhotplug", 34 .class = ACPI_MEMORY_DEVICE_CLASS, 35 .ids = memory_device_ids, 36}; 37 38int xen_stub_memory_device_init(void) 39{ 40 if (!xen_initial_domain()) 41 return -ENODEV; 42 43 /* just reserve space for Xen, block native driver loaded */ 44 return acpi_bus_register_driver(&xen_stub_memory_device_driver); 45} 46EXPORT_SYMBOL_GPL(xen_stub_memory_device_init); 47subsys_initcall(xen_stub_memory_device_init); 48 49void xen_stub_memory_device_exit(void) 50{ 51 acpi_bus_unregister_driver(&xen_stub_memory_device_driver); 52} 53EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit); 54 55 56/*-------------------------------------------- 57 stub driver for Xen cpu hotplug 58--------------------------------------------*/ 59 60static const struct acpi_device_id processor_device_ids[] = { 61 {ACPI_PROCESSOR_OBJECT_HID, 0}, 62 {ACPI_PROCESSOR_DEVICE_HID, 0}, 63 {"", 0}, 64}; 65 66static struct acpi_driver xen_stub_processor_driver = { 67 /* same name as native processor driver to block native loaded */ 68 .name = "processor", 69 .class = ACPI_PROCESSOR_CLASS, 70 .ids = processor_device_ids, 71}; 72 73int xen_stub_processor_init(void) 74{ 75 if (!xen_initial_domain()) 76 return -ENODEV; 77 78 /* just reserve space for Xen, block native driver loaded */ 79 return acpi_bus_register_driver(&xen_stub_processor_driver); 80} 81EXPORT_SYMBOL_GPL(xen_stub_processor_init); 82subsys_initcall(xen_stub_processor_init); 83 84void xen_stub_processor_exit(void) 85{ 86 acpi_bus_unregister_driver(&xen_stub_processor_driver); 87} 88EXPORT_SYMBOL_GPL(xen_stub_processor_exit); 89 90#endif 91