[Qemu-devel] [PATCH 09/22] introduce CPU hot-plug notifier

[Igor Mammedov]

hot-added CPU will be distributed to acpi_piix4, rtc_cmos and icc_bridge

Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
v2:
  * move notifier to qom/cpu.c and call it from CPUClass.realize() on hotplug
---
 include/qom/cpu.h       |  2 ++
 include/sysemu/sysemu.h |  3 +++
 qom/cpu.c               | 12 ++++++++++++
 3 files changed, 17 insertions(+)

diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 6d6eb7a..210aca3 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -46,6 +46,7 @@ typedef struct CPUState CPUState;
  * @reset: Callback to reset the #CPUState to its initial state.
  * @do_interrupt: Callback for interrupt handling.
  * @resume: Callback for putting CPU in runable state
+ * @get_firmware_id: Callback for getting arch depended CPU id
  * @vmsd: State description for migration.
  *
  * Represents a CPU family or model.
@@ -60,6 +61,7 @@ typedef struct CPUClass {
     void (*reset)(CPUState *cpu);
     void (*do_interrupt)(CPUState *cpu);
     void (*resume)(CPUState *cpu);
+    void (*get_firmware_id)(CPUState *cpu);
 
     const struct VMStateDescription *vmsd;
 } CPUClass;
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 6578782..a8c3de1 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -152,6 +152,9 @@ void do_pci_device_hot_remove(Monitor *mon, const QDict 
*qdict);
 /* generic hotplug */
 void drive_hot_add(Monitor *mon, const QDict *qdict);
 
+/* CPU hotplug */
+void qemu_register_cpu_added_notifier(Notifier *notifier);
+
 /* pcie aer error injection */
 void pcie_aer_inject_error_print(Monitor *mon, const QObject *data);
 int do_pcie_aer_inject_error(Monitor *mon,
diff --git a/qom/cpu.c b/qom/cpu.c
index c062e00..10ceaed 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -21,6 +21,17 @@
 #include "qom/cpu.h"
 #include "qemu-common.h"
 #include "sysemu/kvm.h"
+#include "qemu/notify.h"
+#include "sysemu/sysemu.h"
+
+/* CPU hot-plug notifiers */
+static NotifierList cpu_added_notifiers =
+    NOTIFIER_LIST_INITIALIZER(cpu_add_notifiers);
+
+void qemu_register_cpu_added_notifier(Notifier *notifier)
+{
+    notifier_list_add(&cpu_added_notifiers, notifier);
+}
 
 void cpu_reset_interrupt(CPUState *cpu, int mask)
 {
@@ -65,6 +76,7 @@ static void cpu_common_realizefn(DeviceState *dev, Error 
**errp)
         if (klass->resume != NULL) {
             klass->resume(CPU(dev));
         }
+        notifier_list_notify(&cpu_added_notifiers, dev);
     }
 }
 
-- 
1.8.1.4