[Qemu-devel] [PATCH v2 06/18] pc: implement NVDIMM device abstract

[Xiao Guangrong <guangrong.xiao@linux.intel.com>]

Introduce "pc-nvdimm" device and it has two parameters:
- @file, which is the backed memory file for NVDIMM device

- @configdata, specify if we need to reserve 128k at the end of
  @file for nvdimm device's config data. Default is false

If @configdata is false, Qemu will build a static and readonly
namespace in memory and use it serveing for
DSM GET_CONFIG_SIZE/GET_CONFIG_DATA requests.
This is good for the user who want to pass whole nvdimm device
and make its data is complete visible to guest

We can use "-device pc-nvdimm,file=/dev/pmem,configdata" in the
Qemu command to create NVDIMM device for the guest

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
---
 default-configs/i386-softmmu.mak   |  1 +
 default-configs/x86_64-softmmu.mak |  1 +
 hw/Makefile.objs                   |  2 +-
 hw/mem/Makefile.objs               |  1 +
 hw/mem/nvdimm/pc-nvdimm.c          | 99 ++++++++++++++++++++++++++++++++++++++
 include/hw/mem/pc-nvdimm.h         | 31 ++++++++++++
 6 files changed, 134 insertions(+), 1 deletion(-)
 create mode 100644 hw/mem/nvdimm/pc-nvdimm.c
 create mode 100644 include/hw/mem/pc-nvdimm.h

diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
index 48b5762..67fc3a8 100644
--- a/default-configs/i386-softmmu.mak
+++ b/default-configs/i386-softmmu.mak
@@ -49,3 +49,4 @@ CONFIG_MEM_HOTPLUG=y
 CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y
+CONFIG_NVDIMM=y
diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
index 4962ed7..dfcde36 100644
--- a/default-configs/x86_64-softmmu.mak
+++ b/default-configs/x86_64-softmmu.mak
@@ -50,3 +50,4 @@ CONFIG_MEM_HOTPLUG=y
 CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y
+CONFIG_NVDIMM=y
diff --git a/hw/Makefile.objs b/hw/Makefile.objs
index 73afa41..1e25d3f 100644
--- a/hw/Makefile.objs
+++ b/hw/Makefile.objs
@@ -30,7 +30,7 @@ devices-dirs-$(CONFIG_SOFTMMU) += vfio/
 devices-dirs-$(CONFIG_VIRTIO) += virtio/
 devices-dirs-$(CONFIG_SOFTMMU) += watchdog/
 devices-dirs-$(CONFIG_SOFTMMU) += xen/
-devices-dirs-$(CONFIG_MEM_HOTPLUG) += mem/
+devices-dirs-y += mem/
 devices-dirs-y += core/
 common-obj-y += $(devices-dirs-y)
 obj-y += $(devices-dirs-y)
diff --git a/hw/mem/Makefile.objs b/hw/mem/Makefile.objs
index b000fb4..4df7482 100644
--- a/hw/mem/Makefile.objs
+++ b/hw/mem/Makefile.objs
@@ -1 +1,2 @@
 common-obj-$(CONFIG_MEM_HOTPLUG) += pc-dimm.o
+common-obj-$(CONFIG_NVDIMM) += nvdimm/pc-nvdimm.o
diff --git a/hw/mem/nvdimm/pc-nvdimm.c b/hw/mem/nvdimm/pc-nvdimm.c
new file mode 100644
index 0000000..a53d235
--- /dev/null
+++ b/hw/mem/nvdimm/pc-nvdimm.c
@@ -0,0 +1,99 @@
+/*
+ * NVDIMM (A Non-Volatile Dual In-line Memory Module) Virtualization Implement
+ *
+ * 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/pc-nvdimm.h"
+
+static char *get_file(Object *obj, Error **errp)
+{
+    PCNVDIMMDevice *nvdimm = PC_NVDIMM(obj);
+
+    return g_strdup(nvdimm->file);
+}
+
+static void set_file(Object *obj, const char *str, Error **errp)
+{
+    PCNVDIMMDevice *nvdimm = PC_NVDIMM(obj);
+
+    if (nvdimm->file) {
+        g_free(nvdimm->file);
+    }
+
+    nvdimm->file = g_strdup(str);
+}
+
+static bool has_configdata(Object *obj, Error **errp)
+{
+    PCNVDIMMDevice *nvdimm = PC_NVDIMM(obj);
+
+    return nvdimm->configdata;
+}
+
+static void set_configdata(Object *obj, bool value, Error **errp)
+{
+    PCNVDIMMDevice *nvdimm = PC_NVDIMM(obj);
+
+    nvdimm->configdata = value;
+}
+
+static void pc_nvdimm_init(Object *obj)
+{
+    object_property_add_str(obj, "file", get_file, set_file, NULL);
+    object_property_add_bool(obj, "configdata", has_configdata,
+                             set_configdata, NULL);
+}
+
+static void pc_nvdimm_realize(DeviceState *dev, Error **errp)
+{
+    PCNVDIMMDevice *nvdimm = PC_NVDIMM(dev);
+
+    if (!nvdimm->file) {
+        error_setg(errp, "file property is not set");
+    }
+}
+
+static void pc_nvdimm_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    /* nvdimm hotplug has not been supported yet. */
+    dc->hotpluggable = false;
+
+    dc->realize = pc_nvdimm_realize;
+    dc->desc = "NVDIMM memory module";
+}
+
+static TypeInfo pc_nvdimm_info = {
+    .name          = TYPE_PC_NVDIMM,
+    .parent        = TYPE_DEVICE,
+    .instance_size = sizeof(PCNVDIMMDevice),
+    .instance_init = pc_nvdimm_init,
+    .class_init    = pc_nvdimm_class_init,
+};
+
+static void pc_nvdimm_register_types(void)
+{
+    type_register_static(&pc_nvdimm_info);
+}
+
+type_init(pc_nvdimm_register_types)
diff --git a/include/hw/mem/pc-nvdimm.h b/include/hw/mem/pc-nvdimm.h
new file mode 100644
index 0000000..51152b8
--- /dev/null
+++ b/include/hw/mem/pc-nvdimm.h
@@ -0,0 +1,31 @@
+/*
+ * NVDIMM (A Non-Volatile Dual In-line Memory Module) Virtualization Implement
+ *
+ * Copyright(C) 2015 Intel Corporation.
+ *
+ * Author:
+ *  Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ *
+ * 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 __PC_NVDIMM_H
+#define __PC_NVDIMM_H
+
+#include "hw/qdev.h"
+
+typedef struct PCNVDIMMDevice {
+    /* private */
+    DeviceState parent_obj;
+
+    char *file;
+    bool configdata;
+} PCNVDIMMDevice;
+
+#define TYPE_PC_NVDIMM "pc-nvdimm"
+
+#define PC_NVDIMM(obj) \
+    OBJECT_CHECK(PCNVDIMMDevice, (obj), TYPE_PC_NVDIMM)
+
+#endif
-- 
2.4.3