[PATCH v5 16/20] microvm: wire up hotplug

From: Gerd Hoffmann <kraxel@redhat.com>
To: qemu-devel@nongnu.org
Cc: Laurent Vivier <lvivier@redhat.com>,
	Peter Maydell <peter.maydell@linaro.org>,
	Thomas Huth <thuth@redhat.com>,
	Eduardo Habkost <ehabkost@redhat.com>,
	Sergio Lopez <slp@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Shannon Zhao <shannon.zhaosl@gmail.com>,
	qemu-arm@nongnu.org, Gerd Hoffmann <kraxel@redhat.com>,
	Igor Mammedov <imammedo@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Richard Henderson <rth@twiddle.net>
Subject: [PATCH v5 16/20] microvm: wire up hotplug
Date: Tue,  7 Jul 2020 14:53:52 +0200	[thread overview]
Message-ID: <20200707125356.32450-17-kraxel@redhat.com> (raw)
In-Reply-To: <20200707125356.32450-1-kraxel@redhat.com>

The cpu hotplug code handles the initialization of coldplugged cpus
too, so it is needed even in case cpu hotplug is not supported.

Wire cpu hotplug up for microvm.
Without this we get a broken MADT table.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/i386/microvm.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c
index 3d8a66cfc3ac..a5b16b728f9f 100644
--- a/hw/i386/microvm.c
+++ b/hw/i386/microvm.c
@@ -320,6 +320,39 @@ static void microvm_fix_kernel_cmdline(MachineState *machine)
     g_free(cmdline);
 }
 
+static void microvm_device_pre_plug_cb(HotplugHandler *hotplug_dev,
+                                       DeviceState *dev, Error **errp)
+{
+    x86_cpu_pre_plug(hotplug_dev, dev, errp);
+}
+
+static void microvm_device_plug_cb(HotplugHandler *hotplug_dev,
+                                   DeviceState *dev, Error **errp)
+{
+    x86_cpu_plug(hotplug_dev, dev, errp);
+}
+
+static void microvm_device_unplug_request_cb(HotplugHandler *hotplug_dev,
+                                             DeviceState *dev, Error **errp)
+{
+    error_setg(errp, "unplug not supported by microvm");
+}
+
+static void microvm_device_unplug_cb(HotplugHandler *hotplug_dev,
+                                     DeviceState *dev, Error **errp)
+{
+    error_setg(errp, "unplug not supported by microvm");
+}
+
+static HotplugHandler *microvm_get_hotplug_handler(MachineState *machine,
+                                                   DeviceState *dev)
+{
+    if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+        return HOTPLUG_HANDLER(machine);
+    }
+    return NULL;
+}
+
 static void microvm_machine_state_init(MachineState *machine)
 {
     MicrovmMachineState *mms = MICROVM_MACHINE(machine);
@@ -503,6 +536,7 @@ static void microvm_machine_initfn(Object *obj)
 static void microvm_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
 
     mc->init = microvm_machine_state_init;
 
@@ -523,6 +557,13 @@ static void microvm_class_init(ObjectClass *oc, void *data)
     /* Machine class handlers */
     mc->reset = microvm_machine_reset;
 
+    /* hotplug (for cpu coldplug) */
+    mc->get_hotplug_handler = microvm_get_hotplug_handler;
+    hc->pre_plug = microvm_device_pre_plug_cb;
+    hc->plug = microvm_device_plug_cb;
+    hc->unplug_request = microvm_device_unplug_request_cb;
+    hc->unplug = microvm_device_unplug_cb;
+
     object_class_property_add(oc, MICROVM_MACHINE_PIC, "OnOffAuto",
                               microvm_machine_get_pic,
                               microvm_machine_set_pic,
@@ -572,6 +613,7 @@ static const TypeInfo microvm_machine_info = {
     .class_size    = sizeof(MicrovmMachineClass),
     .class_init    = microvm_class_init,
     .interfaces = (InterfaceInfo[]) {
+         { TYPE_HOTPLUG_HANDLER },
          { }
     },
 };
-- 
2.18.4


