diff options
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/xen/Makefile | 1 | ||||
| -rw-r--r-- | drivers/xen/xen-stub.c | 66 |
3 files changed, 78 insertions, 0 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig index cabfa97f4674..c1c8566c6840 100644 --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -180,6 +180,17 @@ config XEN_PRIVCMD depends on XEN default m +config XEN_STUB + bool "Xen stub drivers" + depends on XEN && X86_64 + default n + help + Allow kernel to install stub drivers, to reserve space for Xen drivers, + i.e. memory hotplug and cpu hotplug, and to block native drivers loaded, + so that real Xen drivers can be modular. + + To enable Xen features like cpu and memory hotplug, select Y here. + config XEN_ACPI_PROCESSOR tristate "Xen ACPI processor" depends on XEN && X86 && ACPI_PROCESSOR && CPU_FREQ diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile index fb213cf81a7b..b63edd824ad4 100644 --- a/drivers/xen/Makefile +++ b/drivers/xen/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_SWIOTLB_XEN) += swiotlb-xen.o obj-$(CONFIG_XEN_MCE_LOG) += mcelog.o obj-$(CONFIG_XEN_PCIDEV_BACKEND) += xen-pciback/ obj-$(CONFIG_XEN_PRIVCMD) += xen-privcmd.o +obj-$(CONFIG_XEN_STUB) += xen-stub.o obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o xen-evtchn-y := evtchn.o xen-gntdev-y := gntdev.o diff --git a/drivers/xen/xen-stub.c b/drivers/xen/xen-stub.c new file mode 100644 index 000000000000..811152f67137 --- /dev/null +++ b/drivers/xen/xen-stub.c @@ -0,0 +1,66 @@ +/* + * xen-stub.c - stub drivers to reserve space for Xen + * + * Copyright (C) 2012 Intel Corporation + * Author: Liu Jinsong <jinsong.liu@intel.com> + * Author: Jiang Yunhong <yunhong.jiang@intel.com> + * + * Copyright (C) 2012 Oracle Inc + * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/types.h> +#include <linux/acpi.h> +#include <acpi/acpi_drivers.h> +#include <xen/acpi.h> + +/*-------------------------------------------- + stub driver for Xen memory hotplug +--------------------------------------------*/ + +#ifdef CONFIG_ACPI + +static const struct acpi_device_id memory_device_ids[] = { + {ACPI_MEMORY_DEVICE_HID, 0}, + {"", 0}, +}; + +static struct acpi_driver xen_stub_memory_device_driver = { + /* same name as native memory driver to block native loaded */ + .name = "acpi_memhotplug", + .class = ACPI_MEMORY_DEVICE_CLASS, + .ids = memory_device_ids, +}; + +int xen_stub_memory_device_init(void) +{ + if (!xen_initial_domain()) + return -ENODEV; + + /* just reserve space for Xen, block native driver loaded */ + return acpi_bus_register_driver(&xen_stub_memory_device_driver); +} +EXPORT_SYMBOL_GPL(xen_stub_memory_device_init); +subsys_initcall(xen_stub_memory_device_init); + +void xen_stub_memory_device_exit(void) +{ + acpi_bus_unregister_driver(&xen_stub_memory_device_driver); +} +EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit); + +#endif |