nvdimm: implement NVDIMM device abstract

Introduce "nvdimm" device which is based on pc-dimm device type

Currently, nothing is specific for nvdimm but hotplug is disabled

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

default-configs/i386-softmmu.mak

@@ -51,6 +51,7 @@ CONFIG_APIC=y
 CONFIG_IOAPIC=y
 CONFIG_PVPANIC=y
 CONFIG_MEM_HOTPLUG=y
+CONFIG_NVDIMM=y
 CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y

default-configs/x86_64-softmmu.mak

@@ -51,6 +51,7 @@ CONFIG_APIC=y
 CONFIG_IOAPIC=y
 CONFIG_PVPANIC=y
 CONFIG_MEM_HOTPLUG=y
+CONFIG_NVDIMM=y
 CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y

hw/acpi/memory_hotplug.c

@@ -231,6 +231,11 @@ void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
                          DeviceState *dev, Error **errp)
 {
     MemStatus *mdev;
+    DeviceClass *dc = DEVICE_GET_CLASS(dev);
+
+    if (!dc->hotpluggable) {
+        return;
+    }
 
     mdev = acpi_memory_slot_status(mem_st, dev, errp);
     if (!mdev) {

hw/mem/Makefile.objs

@@ -1 +1,2 @@
 common-obj-$(CONFIG_MEM_HOTPLUG) += pc-dimm.o
+common-obj-$(CONFIG_NVDIMM) += nvdimm.o

hw/mem/nvdimm.c

@@ -0,0 +1,46 @@
+/*
+ * Non-Volatile Dual In-line Memory Module Virtualization Implementation
+ *
+ * Copyright(C) 2015 Intel Corporation.
+ *
+ * Author:
+ *  Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ *
+ * Currently, it only supports PMEM Virtualization.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "hw/mem/nvdimm.h"
+
+static void nvdimm_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    /* nvdimm hotplug has not been supported yet. */
+    dc->hotpluggable = false;
+}
+
+static TypeInfo nvdimm_info = {
+    .name          = TYPE_NVDIMM,
+    .parent        = TYPE_PC_DIMM,
+    .class_init    = nvdimm_class_init,
+};
+
+static void nvdimm_register_types(void)
+{
+    type_register_static(&nvdimm_info);
+}
+
+type_init(nvdimm_register_types)

include/hw/mem/nvdimm.h

@@ -0,0 +1,29 @@
+/*
+ * Non-Volatile Dual In-line Memory Module Virtualization Implementation
+ *
+ * Copyright(C) 2015 Intel Corporation.
+ *
+ * Author:
+ *  Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ *
+ * NVDIMM specifications and some documents can be found at:
+ * NVDIMM ACPI device and NFIT are introduced in ACPI 6:
+ *      http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
+ * NVDIMM Namespace specification:
+ *      http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
+ * DSM Interface Example:
+ *      http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
+ * Driver Writer's Guide:
+ *      http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_NVDIMM_H
+#define QEMU_NVDIMM_H
+
+#include "hw/mem/pc-dimm.h"
+
+#define TYPE_NVDIMM      "nvdimm"
+#endif