[PATCH RFC 15/22] arm/cpuhp: Update ACPI GED framework to support vcpu hotplug

[Salil Mehta]

ACPI GED shall be used to convey to the guest kernel about any cpu hot-(un)plug
events. Therefore, existing ACPI GED framework inside QEMU needs to be enhanced
to support CPU hotplug state and events.

Co-developed-by: Keqian Zhu <zhukeqi...@huawei.com>
Signed-off-by: Salil Mehta <salil.me...@huawei.com>
---
 hw/acpi/generic_event_device.c | 42 ++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index 79177deda2..df81e9292a 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -13,7 +13,9 @@
 #include "qapi/error.h"
 #include "exec/address-spaces.h"
 #include "hw/acpi/acpi.h"
+#include "hw/acpi/cpu.h"
 #include "hw/acpi/generic_event_device.h"
+#include "hw/arm/virt.h"
 #include "hw/irq.h"
 #include "hw/mem/pc-dimm.h"
 #include "hw/mem/nvdimm.h"
@@ -192,12 +194,47 @@ static void acpi_ged_device_plug_cb(HotplugHandler 
*hotplug_dev,
         } else {
             acpi_memory_plug_cb(hotplug_dev, &s->memhp_state, dev, errp);
         }
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+        acpi_cpu_plug_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
     } else {
         error_setg(errp, "virt: device plug request for unsupported device"
                    " type: %s", object_get_typename(OBJECT(dev)));
     }
 }
 
+static void acpi_ged_device_unplug_request_cb(HotplugHandler *hotplug_dev,
+                                    DeviceState *dev, Error **errp)
+{
+    AcpiGedState *s = ACPI_GED(hotplug_dev);
+
+    if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+            acpi_cpu_unplug_request_cb(hotplug_dev, &s->cpuhp_state, dev, 
errp);
+    } else {
+        error_setg(errp, "virt: device unplug request for the unsupported 
device"
+                   " type: %s", object_get_typename(OBJECT(dev)));
+    }
+}
+
+static void acpi_ged_device_unplug_cb(HotplugHandler *hotplug_dev,
+                                      DeviceState *dev, Error **errp)
+{
+    AcpiGedState *s = ACPI_GED(hotplug_dev);
+
+    if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+            acpi_cpu_unplug_cb(&s->cpuhp_state, dev, errp);
+     } else {
+         error_setg(errp, "virt: device plug request for unsupported device"
+                    " type: %s", object_get_typename(OBJECT(dev)));
+     }
+}
+
+static void acpi_ged_ospm_status(AcpiDeviceIf *adev, ACPIOSTInfoList ***list)
+{
+    AcpiGedState *s = ACPI_GED(adev);
+
+    acpi_cpu_ospm_status(&s->cpuhp_state, list);
+}
+
 static void acpi_ged_send_event(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
 {
     AcpiGedState *s = ACPI_GED(adev);
@@ -210,6 +247,8 @@ static void acpi_ged_send_event(AcpiDeviceIf *adev, 
AcpiEventStatusBits ev)
         sel = ACPI_GED_PWR_DOWN_EVT;
     } else if (ev & ACPI_NVDIMM_HOTPLUG_STATUS) {
         sel = ACPI_GED_NVDIMM_HOTPLUG_EVT;
+    } else if (ev & ACPI_CPU_HOTPLUG_STATUS) {
+        sel = ACPI_GED_CPU_HOTPLUG_EVT;
     } else {
         /* Unknown event. Return without generating interrupt. */
         warn_report("GED: Unsupported event %d. No irq injected", ev);
@@ -330,8 +369,11 @@ static void acpi_ged_class_init(ObjectClass *class, void 
*data)
     dc->vmsd = &vmstate_acpi_ged;
 
     hc->plug = acpi_ged_device_plug_cb;
+    hc->unplug_request = acpi_ged_device_unplug_request_cb;
+    hc->unplug = acpi_ged_device_unplug_cb;
 
     adevc->send_event = acpi_ged_send_event;
+    adevc->ospm_status = acpi_ged_ospm_status;
 }
 
 static const TypeInfo acpi_ged_info = {
-- 
2.17.1