include/sysemu/hostmem.h

   1 /*
   2  * QEMU Host Memory Backend
   3  *
   4  * Copyright (C) 2013-2014 Red Hat Inc
   5  *
   6  * Authors:
   7  *   Igor Mammedov <imammedo@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #ifndef SYSEMU_HOSTMEM_H
  14 #define SYSEMU_HOSTMEM_H
  15
  16 #include "sysemu/sysemu.h" /* for MAX_NODES */
  17 #include "qapi/qapi-types-misc.h"
  18 #include "qom/object.h"
  19 #include "exec/memory.h"
  20 #include "qemu/bitmap.h"
  21
  22 #define TYPE_MEMORY_BACKEND "memory-backend"
  23 #define MEMORY_BACKEND(obj) \
  24     OBJECT_CHECK(HostMemoryBackend, (obj), TYPE_MEMORY_BACKEND)
  25 #define MEMORY_BACKEND_GET_CLASS(obj) \
  26     OBJECT_GET_CLASS(HostMemoryBackendClass, (obj), TYPE_MEMORY_BACKEND)
  27 #define MEMORY_BACKEND_CLASS(klass) \
  28     OBJECT_CLASS_CHECK(HostMemoryBackendClass, (klass), TYPE_MEMORY_BACKEND)
  29
  30 typedef struct HostMemoryBackend HostMemoryBackend;
  31 typedef struct HostMemoryBackendClass HostMemoryBackendClass;
  32
  33 /**
  34  * HostMemoryBackendClass:
  35  * @parent_class: opaque parent class container
  36  */
  37 struct HostMemoryBackendClass {
  38     ObjectClass parent_class;
  39
  40     void (*alloc)(HostMemoryBackend *backend, Error **errp);
  41 };
  42
  43 /**
  44  * @HostMemoryBackend
  45  *
  46  * @parent: opaque parent object container
  47  * @size: amount of memory backend provides
  48  * @mr: MemoryRegion representing host memory belonging to backend
  49  */
  50 struct HostMemoryBackend {
  51     /* private */
  52     Object parent;
  53
  54     /* protected */
  55     char *id;
  56     uint64_t size;
  57     bool merge, dump;
  58     bool prealloc, force_prealloc, is_mapped, share;
  59     DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
  60     HostMemPolicy policy;
  61
  62     MemoryRegion mr;
  63 };
  64
  65 bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
  66 MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend,
  67                                              Error **errp);
  68
  69 void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped);
  70 bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
  71 size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
  72
  73 #endif