[PATCH 1/3] Xen stub driver for CPU hotplug

[Liu Jinsong]

Add Xen stub driver for CPU hotplug, early occupy to block native,
will be replaced later by real Xen processor driver module.

Signed-off-by: Liu Jinsong <jinsong.liu@xxxxxxxxx>
---
 drivers/xen/xen-stub.c |   39 +++++++++++++++++++++++++++++++++++++--
 include/xen/acpi.h     |    7 +++++++
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-stub.c b/drivers/xen/xen-stub.c
index 811152f..d85e411 100644
--- a/drivers/xen/xen-stub.c
+++ b/drivers/xen/xen-stub.c
@@ -28,12 +28,12 @@
 #include <acpi/acpi_drivers.h>
 #include <xen/acpi.h>
=20
+#ifdef CONFIG_ACPI
+
 /*--------------------------------------------
 	stub driver for Xen memory hotplug
 --------------------------------------------*/
=20
-#ifdef CONFIG_ACPI
-
 static const struct acpi_device_id memory_device_ids[] =3D {
 	{ACPI_MEMORY_DEVICE_HID, 0},
 	{"", 0},
@@ -63,4 +63,39 @@ void xen_stub_memory_device_exit(void)
 }
 EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
=20
+
+/*--------------------------------------------
+	stub driver for Xen cpu hotplug
+--------------------------------------------*/
+
+static const struct acpi_device_id processor_device_ids[] =3D {
+	{ACPI_PROCESSOR_OBJECT_HID, 0},
+	{ACPI_PROCESSOR_DEVICE_HID, 0},
+	{"", 0},
+};
+
+static struct acpi_driver xen_stub_processor_driver =3D {
+	/* same name as native processor driver to block native loaded */
+	.name =3D "processor",
+	.class =3D ACPI_PROCESSOR_CLASS,
+	.ids =3D processor_device_ids,
+};
+
+int xen_stub_processor_init(void)
+{
+	if (!xen_initial_domain())
+		return -ENODEV;
+
+	/* just reserve space for Xen, block native driver loaded */
+	return acpi_bus_register_driver(&xen_stub_processor_driver);
+}
+EXPORT_SYMBOL_GPL(xen_stub_processor_init);
+subsys_initcall(xen_stub_processor_init);
+
+void xen_stub_processor_exit(void)
+{
+	acpi_bus_unregister_driver(&xen_stub_processor_driver);
+}
+EXPORT_SYMBOL_GPL(xen_stub_processor_exit);
+
 #endif
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
index ce7e526..2b3103b 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -47,6 +47,13 @@
 int xen_stub_memory_device_init(void);
 void xen_stub_memory_device_exit(void);
=20
+#define ACPI_PROCESSOR_CLASS            "processor"
+#define ACPI_PROCESSOR_DEVICE_HID       "ACPI0007"
+#define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
+
+int xen_stub_processor_init(void);
+void xen_stub_processor_exit(void);
+
 int xen_acpi_notify_hypervisor_state(u8 sleep_state,
 				     u32 pm1a_cnt, u32 pm1b_cnd);
=20
--=20
1.7.1

--_002_DE8DF0795D48FD4CA783C40EC82923353DD6E1SHSMSX101ccrcorpi_
Content-Type: application/octet-stream;
	name="0001-Xen-stub-driver-for-CPU-hotplug.patch"
Content-Description: 0001-Xen-stub-driver-for-CPU-hotplug.patch
Content-Disposition: attachment;
	filename="0001-Xen-stub-driver-for-CPU-hotplug.patch"; size=2707;
	creation-date="Fri, 25 Jan 2013 08:52:32 GMT";
	modification-date="Fri, 25 Jan 2013 16:45:18 GMT"
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--_002_DE8DF0795D48FD4CA783C40EC82923353DD6E1SHSMSX101ccrcorpi_--
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