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#include "qemu-common.h"
  13
  14#include "hw/remote/memory.h"
  15#include "exec/ram_addr.h"
  16#include "qapi/error.h"
  17
  18static void remote_sysmem_reset(void)
  19{
  20    MemoryRegion *sysmem, *subregion, *next;
  21
  22    sysmem = get_system_memory();
  23
  24    QTAILQ_FOREACH_SAFE(subregion, &sysmem->subregions, subregions_link, next) {
  25        if (subregion->ram) {
  26            memory_region_del_subregion(sysmem, subregion);
  27            object_unparent(OBJECT(subregion));
  28        }
  29    }
  30}
  31
  32void remote_sysmem_reconfig(MPQemuMsg *msg, Error **errp)
  33{
  34    ERRP_GUARD();
  35    SyncSysmemMsg *sysmem_info = &msg->data.sync_sysmem;
  36    MemoryRegion *sysmem, *subregion;
  37    static unsigned int suffix;
  38    int region;
  39
  40    sysmem = get_system_memory();
  41
  42    remote_sysmem_reset();
  43
  44    for (region = 0; region < msg->num_fds; region++, suffix++) {
  45        g_autofree char *name = g_strdup_printf("remote-mem-%u", suffix);
  46        subregion = g_new(MemoryRegion, 1);
  47        memory_region_init_ram_from_fd(subregion, NULL,
  48                                       name, sysmem_info->sizes[region],
  49                                       RAM_SHARED, msg->fds[region],
  50                                       sysmem_info->offsets[region],
  51                                       errp);
  52
  53        if (*errp) {
  54            g_free(subregion);
  55            remote_sysmem_reset();
  56            return;
  57        }
  58
  59        memory_region_add_subregion(sysmem, sysmem_info->gpas[region],
  60                                    subregion);
  61
  62    }
  63}
  64