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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
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)
26 && s->vmcoreinfo.guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE;
27}
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));
35 s->vmcoreinfo.host_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF);
36}
37
38static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
39{
40 VMCoreInfoState *s = VMCOREINFO(dev);
41 FWCfgState *fw_cfg = fw_cfg_find();
42
43 static VMCoreInfoState * volatile vmcoreinfo_state G_GNUC_UNUSED;
44
45
46
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
66
67
68 qemu_register_reset(vmcoreinfo_reset, dev);
69 vmcoreinfo_state = s;
70}
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;
93 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
94}
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)
109