LXR qemu/hw/remote/memory.c

   1/*
   2 * Memory manager for remote device
   3 *
   4 * Copyright © 2018, 2021 Oracle and/or its affiliates.
   5 *
   6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7 * See the COPYING file in the top-level directory.
   8 *
   9 */
  10
  11#include "qemu/osdep.h"
  12
  13#include "hw/remote/memory.h"
  14#include "exec/ram_addr.h"
  15#include "qapi/error.h"
  16
  17static void remote_sysmem_reset(void)
  18{
  19    MemoryRegion *sysmem, *subregion, *next;
  20
  21    sysmem = get_system_memory();
  22
  23    QTAILQ_FOREACH_SAFE(subregion, &sysmem->subregions, subregions_link, next) {
  24        if (subregion->ram) {
  25            memory_region_del_subregion(sysmem, subregion);
  26            object_unparent(OBJECT(subregion));
  27        }
  28    }
  29}
  30
  31void remote_sysmem_reconfig(MPQemuMsg *msg, Error **errp)
  32{
  33    ERRP_GUARD();
  34    SyncSysmemMsg *sysmem_info = &msg->data.sync_sysmem;
  35    MemoryRegion *sysmem, *subregion;
  36    static unsigned int suffix;
  37    int region;
  38
  39    sysmem = get_system_memory();
  40
  41    remote_sysmem_reset();
  42
  43    for (region = 0; region < msg->num_fds; region++, suffix++) {
  44        g_autofree char *name = g_strdup_printf("remote-mem-%u", suffix);
  45        subregion = g_new(MemoryRegion, 1);
  46        memory_region_init_ram_from_fd(subregion, NULL,
  47                                       name, sysmem_info->sizes[region],
  48                                       RAM_SHARED, msg->fds[region],
  49                                       sysmem_info->offsets[region],
  50                                       errp);
  51
  52        if (*errp) {
  53            g_free(subregion);
  54            remote_sysmem_reset();
  55            return;
  56        }
  57
  58        memory_region_add_subregion(sysmem, sysmem_info->gpas[region],
  59                                    subregion);
  60
  61    }
  62}
  63