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 | qemu_register_reset(vmcoreinfo_reset, dev); |
65 | vmcoreinfo_state = s; |
66 | } |
67 | |
68 | static const VMStateDescription vmstate_vmcoreinfo = { |
69 | .name = "vmcoreinfo" , |
70 | .version_id = 1, |
71 | .minimum_version_id = 1, |
72 | .fields = (VMStateField[]) { |
73 | VMSTATE_BOOL(has_vmcoreinfo, VMCoreInfoState), |
74 | VMSTATE_UINT16(vmcoreinfo.host_format, VMCoreInfoState), |
75 | VMSTATE_UINT16(vmcoreinfo.guest_format, VMCoreInfoState), |
76 | VMSTATE_UINT32(vmcoreinfo.size, VMCoreInfoState), |
77 | VMSTATE_UINT64(vmcoreinfo.paddr, VMCoreInfoState), |
78 | VMSTATE_END_OF_LIST() |
79 | }, |
80 | }; |
81 | |
82 | static void vmcoreinfo_device_class_init(ObjectClass *klass, void *data) |
83 | { |
84 | DeviceClass *dc = DEVICE_CLASS(klass); |
85 | |
86 | dc->vmsd = &vmstate_vmcoreinfo; |
87 | dc->realize = vmcoreinfo_realize; |
88 | dc->hotpluggable = false; |
89 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
90 | } |
91 | |
92 | static const TypeInfo vmcoreinfo_device_info = { |
93 | .name = VMCOREINFO_DEVICE, |
94 | .parent = TYPE_DEVICE, |
95 | .instance_size = sizeof(VMCoreInfoState), |
96 | .class_init = vmcoreinfo_device_class_init, |
97 | }; |
98 | |
99 | static void vmcoreinfo_register_types(void) |
100 | { |
101 | type_register_static(&vmcoreinfo_device_info); |
102 | } |
103 | |
104 | type_init(vmcoreinfo_register_types) |
105 | |