Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 266 insertions, 0 deletions

diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c
new file mode 100644
index 000000000..7397b6715
--- /dev/null
+++ b/hw/mem/nvdimm.c
@@ -0,0 +1,266 @@
+/*
+ * 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 2.1 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 "qemu/osdep.h"
+#include "qemu/module.h"
+#include "qemu/pmem.h"
+#include "qapi/error.h"
+#include "qapi/visitor.h"
+#include "hw/mem/nvdimm.h"
+#include "hw/qdev-properties.h"
+#include "hw/mem/memory-device.h"
+#include "sysemu/hostmem.h"
+
+static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name,
+                                  void *opaque, Error **errp)
+{
+    NVDIMMDevice *nvdimm = NVDIMM(obj);
+    uint64_t value = nvdimm->label_size;
+
+    visit_type_size(v, name, &value, errp);
+}
+
+static void nvdimm_set_label_size(Object *obj, Visitor *v, const char *name,
+                                  void *opaque, Error **errp)
+{
+    NVDIMMDevice *nvdimm = NVDIMM(obj);
+    uint64_t value;
+
+    if (nvdimm->nvdimm_mr) {
+        error_setg(errp, "cannot change property value");
+        return;
+    }
+
+    if (!visit_type_size(v, name, &value, errp)) {
+        return;
+    }
+    if (value < MIN_NAMESPACE_LABEL_SIZE) {
+        error_setg(errp, "Property '%s.%s' (0x%" PRIx64 ") is required"
+                   " at least 0x%lx", object_get_typename(obj), name, value,
+                   MIN_NAMESPACE_LABEL_SIZE);
+        return;
+    }
+
+    nvdimm->label_size = value;
+}
+
+static void nvdimm_get_uuid(Object *obj, Visitor *v, const char *name,
+                                  void *opaque, Error **errp)
+{
+    NVDIMMDevice *nvdimm = NVDIMM(obj);
+    char *value = NULL;
+
+    value = qemu_uuid_unparse_strdup(&nvdimm->uuid);
+
+    visit_type_str(v, name, &value, errp);
+    g_free(value);
+}
+
+
+static void nvdimm_set_uuid(Object *obj, Visitor *v, const char *name,
+                                  void *opaque, Error **errp)
+{
+    NVDIMMDevice *nvdimm = NVDIMM(obj);
+    char *value;
+
+    if (!visit_type_str(v, name, &value, errp)) {
+        return;
+    }
+
+    if (qemu_uuid_parse(value, &nvdimm->uuid) != 0) {
+        error_setg(errp, "Property '%s.%s' has invalid value",
+                   object_get_typename(obj), name);
+    }
+
+    g_free(value);
+}
+
+
+static void nvdimm_init(Object *obj)
+{
+    object_property_add(obj, NVDIMM_LABEL_SIZE_PROP, "int",
+                        nvdimm_get_label_size, nvdimm_set_label_size, NULL,
+                        NULL);
+
+    object_property_add(obj, NVDIMM_UUID_PROP, "QemuUUID", nvdimm_get_uuid,
+                        nvdimm_set_uuid, NULL, NULL);
+}
+
+static void nvdimm_finalize(Object *obj)
+{
+    NVDIMMDevice *nvdimm = NVDIMM(obj);
+
+    g_free(nvdimm->nvdimm_mr);
+}
+
+static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
+{
+    PCDIMMDevice *dimm = PC_DIMM(nvdimm);
+    uint64_t align, pmem_size, size;
+    MemoryRegion *mr;
+
+    g_assert(!nvdimm->nvdimm_mr);
+
+    if (!dimm->hostmem) {
+        error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
+        return;
+    }
+
+    mr = host_memory_backend_get_memory(dimm->hostmem);
+    align = memory_region_get_alignment(mr);
+    size = memory_region_size(mr);
+
+    pmem_size = size - nvdimm->label_size;
+    nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
+    pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
+
+    if (size <= nvdimm->label_size || !pmem_size) {
+        HostMemoryBackend *hostmem = dimm->hostmem;
+
+        error_setg(errp, "the size of memdev %s (0x%" PRIx64 ") is too "
+                   "small to contain nvdimm label (0x%" PRIx64 ") and "
+                   "aligned PMEM (0x%" PRIx64 ")",
+                   object_get_canonical_path_component(OBJECT(hostmem)),
+                   memory_region_size(mr), nvdimm->label_size, align);
+        return;
+    }
+
+    if (!nvdimm->unarmed && memory_region_is_rom(mr)) {
+        HostMemoryBackend *hostmem = dimm->hostmem;
+
+        error_setg(errp, "'unarmed' property must be off since memdev %s "
+                   "is read-only",
+                   object_get_canonical_path_component(OBJECT(hostmem)));
+        return;
+    }
+
+    nvdimm->nvdimm_mr = g_new(MemoryRegion, 1);
+    memory_region_init_alias(nvdimm->nvdimm_mr, OBJECT(dimm),
+                             "nvdimm-memory", mr, 0, pmem_size);
+    memory_region_set_nonvolatile(nvdimm->nvdimm_mr, true);
+    nvdimm->nvdimm_mr->align = align;
+}
+
+static MemoryRegion *nvdimm_md_get_memory_region(MemoryDeviceState *md,
+                                                 Error **errp)
+{
+    NVDIMMDevice *nvdimm = NVDIMM(md);
+    Error *local_err = NULL;
+
+    if (!nvdimm->nvdimm_mr) {
+        nvdimm_prepare_memory_region(nvdimm, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return NULL;
+        }
+    }
+    return nvdimm->nvdimm_mr;
+}
+
+static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
+{
+    NVDIMMDevice *nvdimm = NVDIMM(dimm);
+
+    if (!nvdimm->nvdimm_mr) {
+        nvdimm_prepare_memory_region(nvdimm, errp);
+    }
+}
+
+/*
+ * the caller should check the input parameters before calling
+ * label read/write functions.
+ */
+static void nvdimm_validate_rw_label_data(NVDIMMDevice *nvdimm, uint64_t size,
+                                        uint64_t offset)
+{
+    assert((nvdimm->label_size >= size + offset) && (offset + size > offset));
+}
+
+static void nvdimm_read_label_data(NVDIMMDevice *nvdimm, void *buf,
+                                   uint64_t size, uint64_t offset)
+{
+    nvdimm_validate_rw_label_data(nvdimm, size, offset);
+
+    memcpy(buf, nvdimm->label_data + offset, size);
+}
+
+static void nvdimm_write_label_data(NVDIMMDevice *nvdimm, const void *buf,
+                                    uint64_t size, uint64_t offset)
+{
+    MemoryRegion *mr;
+    PCDIMMDevice *dimm = PC_DIMM(nvdimm);
+    bool is_pmem = object_property_get_bool(OBJECT(dimm->hostmem),
+                                            "pmem", NULL);
+    uint64_t backend_offset;
+
+    nvdimm_validate_rw_label_data(nvdimm, size, offset);
+
+    if (!is_pmem) {
+        memcpy(nvdimm->label_data + offset, buf, size);
+    } else {
+        pmem_memcpy_persist(nvdimm->label_data + offset, buf, size);
+    }
+
+    mr = host_memory_backend_get_memory(dimm->hostmem);
+    backend_offset = memory_region_size(mr) - nvdimm->label_size + offset;
+    memory_region_set_dirty(mr, backend_offset, size);
+}
+
+static Property nvdimm_properties[] = {
+    DEFINE_PROP_BOOL(NVDIMM_UNARMED_PROP, NVDIMMDevice, unarmed, false),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void nvdimm_class_init(ObjectClass *oc, void *data)
+{
+    PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
+    MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
+    NVDIMMClass *nvc = NVDIMM_CLASS(oc);
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    ddc->realize = nvdimm_realize;
+    mdc->get_memory_region = nvdimm_md_get_memory_region;
+    device_class_set_props(dc, nvdimm_properties);
+
+    nvc->read_label_data = nvdimm_read_label_data;
+    nvc->write_label_data = nvdimm_write_label_data;
+    set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
+}
+
+static TypeInfo nvdimm_info = {
+    .name          = TYPE_NVDIMM,
+    .parent        = TYPE_PC_DIMM,
+    .class_size    = sizeof(NVDIMMClass),
+    .class_init    = nvdimm_class_init,
+    .instance_size = sizeof(NVDIMMDevice),
+    .instance_init = nvdimm_init,
+    .instance_finalize = nvdimm_finalize,
+};
+
+static void nvdimm_register_types(void)
+{
+    type_register_static(&nvdimm_info);
+}
+
+type_init(nvdimm_register_types)