LXR qemu/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"
  23OBJECT_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 */
  46struct 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 */
  60struct 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;
  68    uint32_t prealloc_threads;
  69    DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
  70    HostMemPolicy policy;
  71
  72    MemoryRegion mr;
  73};
  74
  75bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
  76MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend);
  77
  78void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped);
  79bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
  80size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
  81char *host_memory_backend_get_name(HostMemoryBackend *backend);
  82
  83#endif
  84