OSPM evaluates _EVT method to map the event. The cpu hotplug event eventually
results in start of the cpu scan. Scan figures out the cpu and the kind of
event(plug/unplug) and notifies it back to the guest.
The change in this patch updates the GED AML _EVT method with the call to
\\_SB.CPUS.CSCN which will do above.
Co-developed-by: Salil Mehta <salil.me...@huawei.com>
Signed-off-by: Salil Mehta <salil.me...@huawei.com>
Co-developed-by: Keqian Zhu <zhukeqi...@huawei.com>
Signed-off-by: Keqian Zhu <zhukeqi...@huawei.com>
Signed-off-by: Salil Mehta <salil.me...@huawei.com>
---
hw/acpi/generic_event_device.c | 4 ++++
include/hw/acpi/cpu_hotplug.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index b84602b238..ad252e6a91 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -108,6 +108,10 @@ void build_ged_aml(Aml *table, const char *name,
HotplugHandler *hotplug_dev,
aml_append(if_ctx, aml_call0(MEMORY_DEVICES_CONTAINER "."
MEMORY_SLOT_SCAN_METHOD));
break;
+ case ACPI_GED_CPU_HOTPLUG_EVT:
+ aml_append(if_ctx, aml_call0(ACPI_CPU_CONTAINER "."
+ ACPI_CPU_SCAN_METHOD));
+ break;
case ACPI_GED_PWR_DOWN_EVT:
aml_append(if_ctx,
aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
diff --git a/include/hw/acpi/cpu_hotplug.h b/include/hw/acpi/cpu_hotplug.h
index 48b291e45e..ef631750b4 100644
--- a/include/hw/acpi/cpu_hotplug.h
+++ b/include/hw/acpi/cpu_hotplug.h
@@ -20,6 +20,8 @@
#include "hw/acpi/cpu.h"
#define ACPI_CPU_HOTPLUG_REG_LEN 12
+#define ACPI_CPU_SCAN_METHOD "CSCN"
+#define ACPI_CPU_CONTAINER "\\_SB.CPUS"
typedef struct AcpiCpuHotplug {
Object *device;
--
2.34.1
