diff mbox series

[RFC,v4,09/16] hw/arm/virt: Add memory hotplug framework

Message ID 20181018143042.29588-10-eric.auger@redhat.com
State New
Headers show
Series [RFC,v4,01/16] hw/arm/boot: introduce fdt_add_memory_node helper | expand

Commit Message

Eric Auger Oct. 18, 2018, 2:30 p.m. UTC 
From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>


This patch adds the the memory hot-plug/hot-unplug infrastructure
in machvirt.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>

Signed-off-by: Kwangwoo Lee <kwangwoo.lee@sk.com>


---
v3 -> v4:
- check the memory device is not hotplugged

v2 -> v3:
- change in pc_dimm_plug()'s signature
- add pc_dimm_pre_plug call

v1 -> v2:
- s/virt_dimm_plug|unplug/virt_memory_plug|unplug
- s/pc_dimm_memory_plug/pc_dimm_plug
- reworded title and commit message
- added pre_plug cb
- don't handle get_memory_region failure anymore
---
 default-configs/arm-softmmu.mak |  2 ++
 hw/arm/virt.c                   | 64 ++++++++++++++++++++++++++++++++-
 2 files changed, 65 insertions(+), 1 deletion(-)

-- 
2.17.1
diff mbox series

Patch

diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
index 2420491aac..1c110cfe7f 100644
--- a/default-configs/arm-softmmu.mak
+++ b/default-configs/arm-softmmu.mak
@@ -159,3 +159,5 @@  CONFIG_PCI_DESIGNWARE=y
 CONFIG_STRONGARM=y
 CONFIG_HIGHBANK=y
 CONFIG_MUSICPAL=y
+CONFIG_MEM_HOTPLUG=y
+
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 9b06797090..1548e9480a 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -60,6 +60,8 @@ 
 #include "standard-headers/linux/input.h"
 #include "hw/arm/smmuv3.h"
 #include "hw/acpi/acpi.h"
+#include "hw/mem/pc-dimm.h"
+#include "hw/mem/nvdimm.h"
 
 #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
     static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
@@ -1771,6 +1773,49 @@  static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
     return ms->possible_cpus;
 }
 
+static void virt_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
+                                 Error **errp)
+{
+    const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
+
+    if (dev->hotplugged) {
+        error_setg(errp, "memory hotplug is not supported");
+    }
+
+    if (is_nvdimm) {
+        error_setg(errp, "nvdimm is not yet supported");
+        return;
+    }
+
+    pc_dimm_pre_plug(dev, MACHINE(hotplug_dev), NULL, errp);
+}
+
+static void virt_memory_plug(HotplugHandler *hotplug_dev,
+                             DeviceState *dev, Error **errp)
+{
+    VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
+    Error *local_err = NULL;
+
+    pc_dimm_plug(dev, MACHINE(vms), &local_err);
+
+    error_propagate(errp, local_err);
+}
+
+static void virt_memory_unplug(HotplugHandler *hotplug_dev,
+                               DeviceState *dev, Error **errp)
+{
+    pc_dimm_unplug(dev, MACHINE(hotplug_dev));
+    object_unparent(OBJECT(dev));
+}
+
+static void virt_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
+                                            DeviceState *dev, Error **errp)
+{
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+        virt_memory_pre_plug(hotplug_dev, dev, errp);
+    }
+}
+
 static void virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
                                         DeviceState *dev, Error **errp)
 {
@@ -1782,12 +1827,27 @@  static void virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
                                      SYS_BUS_DEVICE(dev));
         }
     }
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+            virt_memory_plug(hotplug_dev, dev, errp);
+    }
+}
+
+static void virt_machine_device_unplug_cb(HotplugHandler *hotplug_dev,
+                                          DeviceState *dev, Error **errp)
+{
+    if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+        virt_memory_unplug(hotplug_dev, dev, errp);
+    } else {
+        error_setg(errp, "device unplug request for unsupported device"
+                   " type: %s", object_get_typename(OBJECT(dev)));
+    }
 }
 
 static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
                                                         DeviceState *dev)
 {
-    if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) {
+    if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE) ||
+       (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM))) {
         return HOTPLUG_HANDLER(machine);
     }
 
@@ -1853,7 +1913,9 @@  static void virt_machine_class_init(ObjectClass *oc, void *data)
     mc->kvm_type = virt_kvm_type;
     assert(!mc->get_hotplug_handler);
     mc->get_hotplug_handler = virt_machine_get_hotplug_handler;
+    hc->pre_plug = virt_machine_device_pre_plug_cb;
     hc->plug = virt_machine_device_plug_cb;
+    hc->unplug = virt_machine_device_unplug_cb;
 }
 
 static const TypeInfo virt_machine_info = {