[Qemu-devel] [PATCH 05/16] introduce CPU hot-plug notifier

[Igor Mammedov <imammedo@redhat.com>]

hot-added CPU will be distributed to acpi_piix4 and rtc_cmos

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
---
v2:
  * move notifier to qom/cpu.c and call it from CPUClass.realize() on hotplug
  * remove get_firmware_id() since it belong to other patch
---
 include/sysemu/sysemu.h |  3 +++
 qom/cpu.c               | 12 ++++++++++++
 2 files changed, 15 insertions(+)

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 40a4259..819986e 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)
 {
@@ -61,6 +72,7 @@ static void cpu_common_realizefn(DeviceState *dev, Error **errp)
     if (dev->hotplugged) {
         cpu_synchronize_post_init(CPU(dev));
         resume_vcpu(CPU(dev));
+        notifier_list_notify(&cpu_added_notifiers, dev);
     }
 }
 
-- 
1.8.2