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Subject[PATCH 1/2] create /sys/hypervisor when needed
To have a home for all hypervisors, this patch
creates /sys/hypervisor.
A new config option SYS_HYPERVISOR is introduced,
which should to be set by architecture dependent
hypervisors (e.g. s390 or Xen).

Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>

---

drivers/base/Kconfig | 4 ++++
drivers/base/Makefile | 1 +
drivers/base/base.h | 5 +++++
drivers/base/hypervisor.c | 20 ++++++++++++++++++++
drivers/base/init.c | 1 +
include/linux/kobject.h | 2 ++
6 files changed, 33 insertions(+)

diff -urpN linux-2.6.17-rc3-mm1/drivers/base/Kconfig linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/Kconfig
--- linux-2.6.17-rc3-mm1/drivers/base/Kconfig 2006-05-08 15:56:23.000000000 +0200
+++ linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/Kconfig 2006-05-08 16:00:58.000000000 +0200
@@ -38,3 +38,7 @@ config DEBUG_DRIVER
If you are unsure about this, say N here.

endmenu
+
+config SYS_HYPERVISOR
+ bool
+ default n
diff -urpN linux-2.6.17-rc3-mm1/drivers/base/Makefile linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/Makefile
--- linux-2.6.17-rc3-mm1/drivers/base/Makefile 2006-05-08 15:56:23.000000000 +0200
+++ linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/Makefile 2006-05-08 16:00:41.000000000 +0200
@@ -9,6 +9,7 @@ obj-$(CONFIG_FW_LOADER) += firmware_clas
obj-$(CONFIG_NUMA) += node.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory.o
obj-$(CONFIG_SMP) += topology.o
+obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o

ifeq ($(CONFIG_DEBUG_DRIVER),y)
EXTRA_CFLAGS += -DDEBUG
diff -urpN linux-2.6.17-rc3-mm1/drivers/base/base.h linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/base.h
--- linux-2.6.17-rc3-mm1/drivers/base/base.h 2006-05-12 18:23:05.000000000 +0200
+++ linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/base.h 2006-05-12 18:13:55.000000000 +0200
@@ -5,6 +5,11 @@ extern int devices_init(void);
extern int buses_init(void);
extern int classes_init(void);
extern int firmware_init(void);
+#ifdef CONFIG_SYS_HYPERVISOR
+extern int hypervisor_init(void);
+#else
+static inline int hypervisor_init(void) { return 0; }
+#endif
extern int platform_bus_init(void);
extern int system_bus_init(void);
extern int cpu_dev_init(void);
diff -urpN linux-2.6.17-rc3-mm1/drivers/base/hypervisor.c linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/hypervisor.c
--- linux-2.6.17-rc3-mm1/drivers/base/hypervisor.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/hypervisor.c 2006-05-12 18:21:43.000000000 +0200
@@ -0,0 +1,20 @@
+/*
+ * hypervisor.c - /sys/hypervisor subsystem.
+ *
+ * Copyright (C) IBM Corp. 2006
+ *
+ * This file is released under the GPLv2
+ */
+
+#include <linux/kobject.h>
+#include <linux/device.h>
+
+#include "base.h"
+
+decl_subsys(hypervisor, NULL, NULL);
+EXPORT_SYMBOL_GPL(hypervisor_subsys);
+
+int __init hypervisor_init(void)
+{
+ return subsystem_register(&hypervisor_subsys);
+}
diff -urpN linux-2.6.17-rc3-mm1/drivers/base/init.c linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/init.c
--- linux-2.6.17-rc3-mm1/drivers/base/init.c 2006-05-08 15:56:23.000000000 +0200
+++ linux-2.6.17-rc3-mm1-sys-hypervisor/drivers/base/init.c 2006-05-08 16:00:07.000000000 +0200
@@ -27,6 +27,7 @@ void __init driver_init(void)
buses_init();
classes_init();
firmware_init();
+ hypervisor_init();

/* These are also core pieces, but must come after the
* core core pieces.
diff -urpN linux-2.6.17-rc3-mm1/include/linux/kobject.h linux-2.6.17-rc3-mm1-sys-hypervisor/include/linux/kobject.h
--- linux-2.6.17-rc3-mm1/include/linux/kobject.h 2006-05-12 18:23:08.000000000 +0200
+++ linux-2.6.17-rc3-mm1-sys-hypervisor/include/linux/kobject.h 2006-05-12 18:13:58.000000000 +0200
@@ -190,6 +190,8 @@ struct subsystem _varname##_subsys = { \

/* The global /sys/kernel/ subsystem for people to chain off of */
extern struct subsystem kernel_subsys;
+/* The global /sys/hypervisor/ subsystem */
+extern struct subsystem hypervisor_subsys;

/**
* Helpers for setting the kset of registered objects.
-
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