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#include "qemu/thread-context.h"
  22
  23#define TYPE_MEMORY_BACKEND "memory-backend"
  24OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass,
  25                    MEMORY_BACKEND)
  26
  27/* hostmem-ram.c */
  28/**
  29 * @TYPE_MEMORY_BACKEND_RAM:
  30 * name of backend that uses mmap on the anonymous RAM
  31 */
  32
  33#define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
  34
  35/* hostmem-file.c */
  36/**
  37 * @TYPE_MEMORY_BACKEND_FILE:
  38 * name of backend that uses mmap on a file descriptor
  39 */
  40#define TYPE_MEMORY_BACKEND_FILE "memory-backend-file"
  41
  42
  43/**
  44 * HostMemoryBackendClass:
  45 * @parent_class: opaque parent class container
  46 */
  47struct HostMemoryBackendClass {
  48    ObjectClass parent_class;
  49
  50    void (*alloc)(HostMemoryBackend *backend, Error **errp);
  51};
  52
  53/**
  54 * @HostMemoryBackend
  55 *
  56 * @parent: opaque parent object container
  57 * @size: amount of memory backend provides
  58 * @mr: MemoryRegion representing host memory belonging to backend
  59 * @prealloc_threads: number of threads to be used for preallocatining RAM
  60 */
  61struct HostMemoryBackend {
  62    /* private */
  63    Object parent;
  64
  65    /* protected */
  66    uint64_t size;
  67    bool merge, dump, use_canonical_path;
  68    bool prealloc, is_mapped, share, reserve;
  69    uint32_t prealloc_threads;
  70    ThreadContext *prealloc_context;
  71    DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
  72    HostMemPolicy policy;
  73
  74    MemoryRegion mr;
  75};
  76
  77bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
  78MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend);
  79
  80void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped);
  81bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
  82size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
  83char *host_memory_backend_get_name(HostMemoryBackend *backend);
  84
  85#endif
  86