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, 83 insertions, 0 deletions

diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h
new file mode 100644
index 000000000..9ff5c1696
--- /dev/null
+++ b/include/sysemu/hostmem.h
@@ -0,0 +1,83 @@
+/*
+ * 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.
+ */
+
+#ifndef SYSEMU_HOSTMEM_H
+#define SYSEMU_HOSTMEM_H
+
+#include "sysemu/numa.h"
+#include "qapi/qapi-types-machine.h"
+#include "qom/object.h"
+#include "exec/memory.h"
+#include "qemu/bitmap.h"
+
+#define TYPE_MEMORY_BACKEND "memory-backend"
+OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass,
+                    MEMORY_BACKEND)
+
+/* hostmem-ram.c */
+/**
+ * @TYPE_MEMORY_BACKEND_RAM:
+ * name of backend that uses mmap on the anonymous RAM
+ */
+
+#define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
+
+/* hostmem-file.c */
+/**
+ * @TYPE_MEMORY_BACKEND_FILE:
+ * name of backend that uses mmap on a file descriptor
+ */
+#define TYPE_MEMORY_BACKEND_FILE "memory-backend-file"
+
+
+/**
+ * HostMemoryBackendClass:
+ * @parent_class: opaque parent class container
+ */
+struct HostMemoryBackendClass {
+    ObjectClass parent_class;
+
+    void (*alloc)(HostMemoryBackend *backend, Error **errp);
+};
+
+/**
+ * @HostMemoryBackend
+ *
+ * @parent: opaque parent object container
+ * @size: amount of memory backend provides
+ * @mr: MemoryRegion representing host memory belonging to backend
+ * @prealloc_threads: number of threads to be used for preallocatining RAM
+ */
+struct HostMemoryBackend {
+    /* private */
+    Object parent;
+
+    /* protected */
+    uint64_t size;
+    bool merge, dump, use_canonical_path;
+    bool prealloc, is_mapped, share, reserve;
+    uint32_t prealloc_threads;
+    DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
+    HostMemPolicy policy;
+
+    MemoryRegion mr;
+};
+
+bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
+MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend);
+
+void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped);
+bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
+size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
+char *host_memory_backend_get_name(HostMemoryBackend *backend);
+
+#endif