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