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/numa.h"
  17 #include "qapi/qapi-types-machine.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 OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass,
  24                     MEMORY_BACKEND)
  25
  26 /* hostmem-ram.c */
  27 /**
  28  * @TYPE_MEMORY_BACKEND_RAM:
  29  * name of backend that uses mmap on the anonymous RAM
  30  */
  31
  32 #define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
  33
  34 /* hostmem-file.c */
  35 /**
  36  * @TYPE_MEMORY_BACKEND_FILE:
  37  * name of backend that uses mmap on a file descriptor
  38  */
  39 #define TYPE_MEMORY_BACKEND_FILE "memory-backend-file"
  40
  41
  42 /**
  43  * HostMemoryBackendClass:
  44  * @parent_class: opaque parent class container
  45  */
  46 struct HostMemoryBackendClass {
  47     ObjectClass parent_class;
  48
  49     void (*alloc)(HostMemoryBackend *backend, Error **errp);
  50 };
  51
  52 /**
  53  * @HostMemoryBackend
  54  *
  55  * @parent: opaque parent object container
  56  * @size: amount of memory backend provides
  57  * @mr: MemoryRegion representing host memory belonging to backend
  58  * @prealloc_threads: number of threads to be used for preallocatining RAM
  59  */
  60 struct HostMemoryBackend {
  61     /* private */
  62     Object parent;
  63
  64     /* protected */
  65     uint64_t size;
  66     bool merge, dump, use_canonical_path;
  67     bool prealloc, is_mapped, share, reserve;
  68     uint32_t prealloc_threads;
  69     DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
  70     HostMemPolicy policy;
  71
  72     MemoryRegion mr;
  73 };
  74
  75 bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
  76 MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend);
  77
  78 void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped);
  79 bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
  80 size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
  81 char *host_memory_backend_get_name(HostMemoryBackend *backend);
  82
  83 #endif