x86: use new method to correct reset sequence

During reset some devices (such as hpet, rtc) might send IRQ to APIC which changes APIC's state from default one it's supposed to have at machine startup time. Fix this by resetting APIC after devices have been reset to cancel any changes that qemu_devices_reset() might have done to its state. Signed-off-by: Zhu Guihua <[email protected]> Reviewed-by: Igor Mammedov <[email protected]> Signed-off-by: Eduardo Habkost <[email protected]>
yinghaoxie · Oct 2, 2015 · ae50c55 · ae50c55
1 parent 8d42d2d
commit ae50c55
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
@@ -1926,6 +1926,25 @@ static void pc_machine_initfn(Object *obj)
                              NULL, &error_abort);
 }
 
+static void pc_machine_reset(void)
+{
+    CPUState *cs;
+    X86CPU *cpu;
+
+    qemu_devices_reset();
+
+    /* Reset APIC after devices have been reset to cancel
+     * any changes that qemu_devices_reset() might have done.
+     */
+    CPU_FOREACH(cs) {
+        cpu = X86_CPU(cs);
+
+        if (cpu->apic_state) {
+            device_reset(cpu->apic_state);
+        }
+    }
+}
+
 static unsigned pc_cpu_index_to_socket_id(unsigned cpu_index)
 {
     X86CPUTopoInfo topo;
@@ -1947,6 +1966,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
     mc->default_boot_order = "cad";
     mc->hot_add_cpu = pc_hot_add_cpu;
     mc->max_cpus = 255;
+    mc->reset = pc_machine_reset;
     hc->plug = pc_machine_device_plug_cb;
     hc->unplug_request = pc_machine_device_unplug_request_cb;
     hc->unplug = pc_machine_device_unplug_cb;