jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
1/*
2 * QEMU simulated pvpanic device.
3 *
4 * Copyright Fujitsu, Corp. 2013
5 *
6 * Authors:
7 * Wen Congyang <wency@cn.fujitsu.com>
8 * Hu Tao <hutao@cn.fujitsu.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
12 *
13 */
14
15#include "qemu/osdep.h"
16#include "qemu/log.h"
17#include "qemu/module.h"
18#include "sysemu/runstate.h"
19
20#include "hw/nvram/fw_cfg.h"
21#include "hw/qdev-properties.h"
22#include "hw/misc/pvpanic.h"
23
24/* The bit of supported pv event, TODO: include uapi header and remove this */
25#define PVPANIC_F_PANICKED 0
26#define PVPANIC_F_CRASHLOADED 1
27
28/* The pv event value */
29#define PVPANIC_PANICKED (1 << PVPANIC_F_PANICKED)
30#define PVPANIC_CRASHLOADED (1 << PVPANIC_F_CRASHLOADED)
31
32#define ISA_PVPANIC_DEVICE(obj) \
33 OBJECT_CHECK(PVPanicState, (obj), TYPE_PVPANIC)
34
35static void handle_event(int event)
36{
37 static bool logged;
38
39 if (event & ~(PVPANIC_PANICKED | PVPANIC_CRASHLOADED) && !logged) {
40 qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
41 logged = true;
42 }
43
44 if (event & PVPANIC_PANICKED) {
45 qemu_system_guest_panicked(NULL);
46 return;
47 }
48
49 if (event & PVPANIC_CRASHLOADED) {
50 qemu_system_guest_crashloaded(NULL);
51 return;
52 }
53}
54
55#include "hw/isa/isa.h"
56
57typedef struct PVPanicState {
58 ISADevice parent_obj;
59
60 MemoryRegion io;
61 uint16_t ioport;
62} PVPanicState;
63
64/* return supported events on read */
65static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size)
66{
67 return PVPANIC_PANICKED;
68}
69
70static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val,
71 unsigned size)
72{
73 handle_event(val);
74}
75
76static const MemoryRegionOps pvpanic_ops = {
77 .read = pvpanic_ioport_read,
78 .write = pvpanic_ioport_write,
79 .impl = {
80 .min_access_size = 1,
81 .max_access_size = 1,
82 },
83};
84
85static void pvpanic_isa_initfn(Object *obj)
86{
87 PVPanicState *s = ISA_PVPANIC_DEVICE(obj);
88
89 memory_region_init_io(&s->io, OBJECT(s), &pvpanic_ops, s, "pvpanic", 1);
90}
91
92static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp)
93{
94 ISADevice *d = ISA_DEVICE(dev);
95 PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
96 FWCfgState *fw_cfg = fw_cfg_find();
97 uint16_t *pvpanic_port;
98
99 if (!fw_cfg) {
100 return;
101 }
102
103 pvpanic_port = g_malloc(sizeof(*pvpanic_port));
104 *pvpanic_port = cpu_to_le16(s->ioport);
105 fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port,
106 sizeof(*pvpanic_port));
107
108 isa_register_ioport(d, &s->io, s->ioport);
109}
110
111static Property pvpanic_isa_properties[] = {
112 DEFINE_PROP_UINT16(PVPANIC_IOPORT_PROP, PVPanicState, ioport, 0x505),
113 DEFINE_PROP_END_OF_LIST(),
114};
115
116static void pvpanic_isa_class_init(ObjectClass *klass, void *data)
117{
118 DeviceClass *dc = DEVICE_CLASS(klass);
119
120 dc->realize = pvpanic_isa_realizefn;
121 device_class_set_props(dc, pvpanic_isa_properties);
122 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
123}
124
125static TypeInfo pvpanic_isa_info = {
126 .name = TYPE_PVPANIC,
127 .parent = TYPE_ISA_DEVICE,
128 .instance_size = sizeof(PVPanicState),
129 .instance_init = pvpanic_isa_initfn,
130 .class_init = pvpanic_isa_class_init,
131};
132
133static void pvpanic_register_types(void)
134{
135 type_register_static(&pvpanic_isa_info);
136}
137
138type_init(pvpanic_register_types)