xen/stub: driver for CPU hotplug
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@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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>
+#ifdef CONFIG_ACPI
+
/*--------------------------------------------
stub driver for Xen memory hotplug
--------------------------------------------*/
-#ifdef CONFIG_ACPI
-
static const struct acpi_device_id memory_device_ids[] = {
{ACPI_MEMORY_DEVICE_HID, 0},
{"", 0},
@@ -63,4 +63,39 @@
}
EXPORT_SYMBOL_GPL(xen_stub_memory_device_exit);
+
+/*--------------------------------------------
+ stub driver for Xen cpu hotplug
+--------------------------------------------*/
+
+static const struct acpi_device_id processor_device_ids[] = {
+ {ACPI_PROCESSOR_OBJECT_HID, 0},
+ {ACPI_PROCESSOR_DEVICE_HID, 0},
+ {"", 0},
+};
+
+static struct acpi_driver xen_stub_processor_driver = {
+ /* same name as native processor driver to block native loaded */
+ .name = "processor",
+ .class = ACPI_PROCESSOR_CLASS,
+ .ids = 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);
+#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);
