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Marc-André Lureau6e433532017-09-11 18:59:24 +02001/*
2 * Virtual Machine coreinfo device
3 *
4 * Copyright (C) 2017 Red Hat, Inc.
5 *
6 * Authors: Marc-André Lureau <marcandre.lureau@redhat.com>
7 *
8 * This work is licensed under the terms of the GNU GPL, version 2 or later.
9 * See the COPYING file in the top-level directory.
10 *
11 */
Markus Armbruster0b8fa322019-05-23 16:35:07 +020012
Marc-André Lureau6e433532017-09-11 18:59:24 +020013#include "qemu/osdep.h"
14#include "qapi/error.h"
Markus Armbruster0b8fa322019-05-23 16:35:07 +020015#include "qemu/module.h"
Markus Armbruster71e8a912019-08-12 07:23:38 +020016#include "sysemu/reset.h"
Marc-André Lureau6e433532017-09-11 18:59:24 +020017#include "hw/nvram/fw_cfg.h"
Markus Armbrusterd6454272019-08-12 07:23:45 +020018#include "migration/vmstate.h"
Marc-André Lureau6e433532017-09-11 18:59:24 +020019#include "hw/misc/vmcoreinfo.h"
20
21static void fw_cfg_vmci_write(void *dev, off_t offset, size_t len)
22{
23 VMCoreInfoState *s = VMCOREINFO(dev);
24
25 s->has_vmcoreinfo = offset == 0 && len == sizeof(s->vmcoreinfo)
Marc-André Lureau5be5df72018-08-17 17:59:10 +020026 && s->vmcoreinfo.guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE;
Marc-André Lureau6e433532017-09-11 18:59:24 +020027}
28
29static void vmcoreinfo_reset(void *dev)
30{
31 VMCoreInfoState *s = VMCOREINFO(dev);
32
33 s->has_vmcoreinfo = false;
34 memset(&s->vmcoreinfo, 0, sizeof(s->vmcoreinfo));
Marc-André Lureau5be5df72018-08-17 17:59:10 +020035 s->vmcoreinfo.host_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF);
Marc-André Lureau6e433532017-09-11 18:59:24 +020036}
37
38static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
39{
40 VMCoreInfoState *s = VMCOREINFO(dev);
41 FWCfgState *fw_cfg = fw_cfg_find();
Marc-André Lureauc3b16422017-12-12 17:27:58 +010042 /* for gdb script dump-guest-memory.py */
43 static VMCoreInfoState * volatile vmcoreinfo_state G_GNUC_UNUSED;
Marc-André Lureau6e433532017-09-11 18:59:24 +020044
45 /* Given that this function is executing, there is at least one VMCOREINFO
46 * device. Check if there are several.
47 */
48 if (!vmcoreinfo_find()) {
49 error_setg(errp, "at most one %s device is permitted",
50 VMCOREINFO_DEVICE);
51 return;
52 }
53
54 if (!fw_cfg || !fw_cfg->dma_enabled) {
55 error_setg(errp, "%s device requires fw_cfg with DMA",
56 VMCOREINFO_DEVICE);
57 return;
58 }
59
Marc-André Lureau5be5df72018-08-17 17:59:10 +020060 fw_cfg_add_file_callback(fw_cfg, FW_CFG_VMCOREINFO_FILENAME,
Marc-André Lureau6e433532017-09-11 18:59:24 +020061 NULL, fw_cfg_vmci_write, s,
62 &s->vmcoreinfo, sizeof(s->vmcoreinfo), false);
63
Philippe Mathieu-Daudé88552b12019-10-10 15:15:27 +020064 /*
65 * This device requires to register a global reset because it is
66 * not plugged to a bus (which, as its QOM parent, would reset it).
67 */
Marc-André Lureau6e433532017-09-11 18:59:24 +020068 qemu_register_reset(vmcoreinfo_reset, dev);
Marc-André Lureauc3b16422017-12-12 17:27:58 +010069 vmcoreinfo_state = s;
Marc-André Lureau6e433532017-09-11 18:59:24 +020070}
71
72static const VMStateDescription vmstate_vmcoreinfo = {
73 .name = "vmcoreinfo",
74 .version_id = 1,
75 .minimum_version_id = 1,
76 .fields = (VMStateField[]) {
77 VMSTATE_BOOL(has_vmcoreinfo, VMCoreInfoState),
78 VMSTATE_UINT16(vmcoreinfo.host_format, VMCoreInfoState),
79 VMSTATE_UINT16(vmcoreinfo.guest_format, VMCoreInfoState),
80 VMSTATE_UINT32(vmcoreinfo.size, VMCoreInfoState),
81 VMSTATE_UINT64(vmcoreinfo.paddr, VMCoreInfoState),
82 VMSTATE_END_OF_LIST()
83 },
84};
85
86static void vmcoreinfo_device_class_init(ObjectClass *klass, void *data)
87{
88 DeviceClass *dc = DEVICE_CLASS(klass);
89
90 dc->vmsd = &vmstate_vmcoreinfo;
91 dc->realize = vmcoreinfo_realize;
92 dc->hotpluggable = false;
Marc-André Lureaub948bb52017-11-06 12:50:32 +010093 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
Marc-André Lureau6e433532017-09-11 18:59:24 +020094}
95
96static const TypeInfo vmcoreinfo_device_info = {
97 .name = VMCOREINFO_DEVICE,
98 .parent = TYPE_DEVICE,
99 .instance_size = sizeof(VMCoreInfoState),
100 .class_init = vmcoreinfo_device_class_init,
101};
102
103static void vmcoreinfo_register_types(void)
104{
105 type_register_static(&vmcoreinfo_device_info);
106}
107
108type_init(vmcoreinfo_register_types)