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, 57 insertions, 0 deletions

diff --git a/backends/hostmem-ram.c b/backends/hostmem-ram.c
new file mode 100644
index 000000000..b8e55cdbd
--- /dev/null
+++ b/backends/hostmem-ram.c
@@ -0,0 +1,57 @@
+/*
+ * QEMU Host Memory Backend
+ *
+ * Copyright (C) 2013-2014 Red Hat Inc
+ *
+ * Authors:
+ *   Igor Mammedov <imammedo@redhat.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.
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/hostmem.h"
+#include "qapi/error.h"
+#include "qemu/module.h"
+#include "qom/object_interfaces.h"
+
+static void
+ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
+{
+    uint32_t ram_flags;
+    char *name;
+
+    if (!backend->size) {
+        error_setg(errp, "can't create backend with size 0");
+        return;
+    }
+
+    name = host_memory_backend_get_name(backend);
+    ram_flags = backend->share ? RAM_SHARED : 0;
+    ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;
+    memory_region_init_ram_flags_nomigrate(&backend->mr, OBJECT(backend), name,
+                                           backend->size, ram_flags, errp);
+    g_free(name);
+}
+
+static void
+ram_backend_class_init(ObjectClass *oc, void *data)
+{
+    HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
+
+    bc->alloc = ram_backend_memory_alloc;
+}
+
+static const TypeInfo ram_backend_info = {
+    .name = TYPE_MEMORY_BACKEND_RAM,
+    .parent = TYPE_MEMORY_BACKEND,
+    .class_init = ram_backend_class_init,
+};
+
+static void register_types(void)
+{
+    type_register_static(&ram_backend_info);
+}
+
+type_init(register_types);