Merge tag 'pull-testing-gdbstub-plugins-gitdm-061022-3' of https://github.com/stsquad...
[qemu.git] / hw / misc / vmcoreinfo.c
1 /*
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 */
12
13 #include "qemu/osdep.h"
14 #include "qapi/error.h"
15 #include "qemu/module.h"
16 #include "sysemu/reset.h"
17 #include "hw/nvram/fw_cfg.h"
18 #include "migration/vmstate.h"
19 #include "hw/misc/vmcoreinfo.h"
20
21 static 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)
26 && s->vmcoreinfo.guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE;
27 }
28
29 static 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));
35 s->vmcoreinfo.host_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF);
36 }
37
38 static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
39 {
40 VMCoreInfoState *s = VMCOREINFO(dev);
41 FWCfgState *fw_cfg = fw_cfg_find();
42 /* for gdb script dump-guest-memory.py */
43 static VMCoreInfoState * volatile vmcoreinfo_state G_GNUC_UNUSED;
44
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
60 fw_cfg_add_file_callback(fw_cfg, FW_CFG_VMCOREINFO_FILENAME,
61 NULL, fw_cfg_vmci_write, s,
62 &s->vmcoreinfo, sizeof(s->vmcoreinfo), false);
63
64 /*
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 */
68 qemu_register_reset(vmcoreinfo_reset, dev);
69 vmcoreinfo_state = s;
70 }
71
72 static 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
86 static 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;
93 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
94 }
95
96 static 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
103 static void vmcoreinfo_register_types(void)
104 {
105 type_register_static(&vmcoreinfo_device_info);
106 }
107
108 type_init(vmcoreinfo_register_types)