[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 |   34 ++++++++++++++++++++++++++++++++--
 include/xen/acpi.h     |    6 ++++++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-stub.c b/drivers/xen/xen-stub.c
index 01a49e3..681e9cc 100644
--- a/drivers/xen/xen-stub.c
+++ b/drivers/xen/xen-stub.c
@@ -28,12 +28,13 @@
 #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},
@@ -57,4 +58,33 @@ static int __init xen_stub_memory_device_init(void)
 }
 subsys_initcall(xen_stub_memory_device_init);
=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},
+};
+
+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,
+};
+EXPORT_SYMBOL_GPL(xen_stub_processor_driver);
+
+static int __init 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);
+}
+subsys_initcall(xen_stub_processor_init);
+
 #endif
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
index 7366e58..1c99eb5 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -46,6 +46,12 @@
=20
 extern struct acpi_driver xen_stub_memory_device_driver;
=20
+#define ACPI_PROCESSOR_CLASS            "processor"
+#define ACPI_PROCESSOR_DEVICE_HID       "ACPI0007"
+#define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
+
+extern struct acpi_driver xen_stub_processor_driver;
+
 int xen_acpi_notify_hypervisor_state(u8 sleep_state,
 				     u32 pm1a_cnt, u32 pm1b_cnd);
=20
--=20
1.7.1

--_002_DE8DF0795D48FD4CA783C40EC82923353C3DB4SHSMSX101ccrcorpi_
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=2536;
	creation-date="Tue, 15 Jan 2013 12:28:09 GMT";
	modification-date="Tue, 15 Jan 2013 20:17:14 GMT"
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--_002_DE8DF0795D48FD4CA783C40EC82923353C3DB4SHSMSX101ccrcorpi_--
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