Merge tag 'for-upstream' of git://repo.or.cz/qemu/kevin into staging
[qemu.git] / 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
17 static 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
31 void 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 }