qcow2: refactor decompress_buffer
[qemu/ar7.git] / hw / misc / vmcoreinfo.c
blob304c6287c76508dd2e6c17f30d0bf9ed050125a6
1 /*
2 * Virtual Machine coreinfo device
4 * Copyright (C) 2017 Red Hat, Inc.
6 * Authors: Marc-André Lureau <marcandre.lureau@redhat.com>
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.
12 #include "qemu/osdep.h"
13 #include "qapi/error.h"
14 #include "hw/nvram/fw_cfg.h"
15 #include "hw/misc/vmcoreinfo.h"
17 static void fw_cfg_vmci_write(void *dev, off_t offset, size_t len)
19 VMCoreInfoState *s = VMCOREINFO(dev);
21 s->has_vmcoreinfo = offset == 0 && len == sizeof(s->vmcoreinfo)
22 && s->vmcoreinfo.guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE;
25 static void vmcoreinfo_reset(void *dev)
27 VMCoreInfoState *s = VMCOREINFO(dev);
29 s->has_vmcoreinfo = false;
30 memset(&s->vmcoreinfo, 0, sizeof(s->vmcoreinfo));
31 s->vmcoreinfo.host_format = cpu_to_le16(FW_CFG_VMCOREINFO_FORMAT_ELF);
34 static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
36 VMCoreInfoState *s = VMCOREINFO(dev);
37 FWCfgState *fw_cfg = fw_cfg_find();
38 /* for gdb script dump-guest-memory.py */
39 static VMCoreInfoState * volatile vmcoreinfo_state G_GNUC_UNUSED;
41 /* Given that this function is executing, there is at least one VMCOREINFO
42 * device. Check if there are several.
44 if (!vmcoreinfo_find()) {
45 error_setg(errp, "at most one %s device is permitted",
46 VMCOREINFO_DEVICE);
47 return;
50 if (!fw_cfg || !fw_cfg->dma_enabled) {
51 error_setg(errp, "%s device requires fw_cfg with DMA",
52 VMCOREINFO_DEVICE);
53 return;
56 fw_cfg_add_file_callback(fw_cfg, FW_CFG_VMCOREINFO_FILENAME,
57 NULL, fw_cfg_vmci_write, s,
58 &s->vmcoreinfo, sizeof(s->vmcoreinfo), false);
60 qemu_register_reset(vmcoreinfo_reset, dev);
61 vmcoreinfo_state = s;
64 static const VMStateDescription vmstate_vmcoreinfo = {
65 .name = "vmcoreinfo",
66 .version_id = 1,
67 .minimum_version_id = 1,
68 .fields = (VMStateField[]) {
69 VMSTATE_BOOL(has_vmcoreinfo, VMCoreInfoState),
70 VMSTATE_UINT16(vmcoreinfo.host_format, VMCoreInfoState),
71 VMSTATE_UINT16(vmcoreinfo.guest_format, VMCoreInfoState),
72 VMSTATE_UINT32(vmcoreinfo.size, VMCoreInfoState),
73 VMSTATE_UINT64(vmcoreinfo.paddr, VMCoreInfoState),
74 VMSTATE_END_OF_LIST()
78 static void vmcoreinfo_device_class_init(ObjectClass *klass, void *data)
80 DeviceClass *dc = DEVICE_CLASS(klass);
82 dc->vmsd = &vmstate_vmcoreinfo;
83 dc->realize = vmcoreinfo_realize;
84 dc->hotpluggable = false;
85 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
88 static const TypeInfo vmcoreinfo_device_info = {
89 .name = VMCOREINFO_DEVICE,
90 .parent = TYPE_DEVICE,
91 .instance_size = sizeof(VMCoreInfoState),
92 .class_init = vmcoreinfo_device_class_init,
95 static void vmcoreinfo_register_types(void)
97 type_register_static(&vmcoreinfo_device_info);
100 type_init(vmcoreinfo_register_types)