hw/misc/pvpanic.c

   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 "qapi/qmp/qobject.h"
  16 #include "qapi/qmp/qjson.h"
  17 #include "monitor/monitor.h"
  18 #include "sysemu/sysemu.h"
  19 #include "qemu/log.h"
  20
  21 #include "hw/nvram/fw_cfg.h"
  22 #include "hw/i386/pc.h"
  23
  24 /* The bit of supported pv event */
  25 #define PVPANIC_F_PANICKED      0
  26
  27 /* The pv event value */
  28 #define PVPANIC_PANICKED        (1 << PVPANIC_F_PANICKED)
  29
  30 #define TYPE_ISA_PVPANIC_DEVICE    "pvpanic"
  31 #define ISA_PVPANIC_DEVICE(obj)    \
  32     OBJECT_CHECK(PVPanicState, (obj), TYPE_ISA_PVPANIC_DEVICE)
  33
  34 static void panicked_mon_event(const char *action)
  35 {
  36     QObject *data;
  37
  38     data = qobject_from_jsonf("{ 'action': %s }", action);
  39     monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
  40     qobject_decref(data);
  41 }
  42
  43 static void handle_event(int event)
  44 {
  45     static bool logged;
  46
  47     if (event & ~PVPANIC_PANICKED && !logged) {
  48         qemu_log_mask(LOG_GUEST_ERROR, "pvpanic: unknown event %#x.\n", event);
  49         logged = true;
  50     }
  51
  52     if (event & PVPANIC_PANICKED) {
  53         panicked_mon_event("pause");
  54         vm_stop(RUN_STATE_GUEST_PANICKED);
  55         return;
  56     }
  57 }
  58
  59 #include "hw/isa/isa.h"
  60
  61 typedef struct PVPanicState {
  62     ISADevice parent_obj;
  63
  64     MemoryRegion io;
  65     uint16_t ioport;
  66 } PVPanicState;
  67
  68 /* return supported events on read */
  69 static uint64_t pvpanic_ioport_read(void *opaque, hwaddr addr, unsigned size)
  70 {
  71     return PVPANIC_PANICKED;
  72 }
  73
  74 static void pvpanic_ioport_write(void *opaque, hwaddr addr, uint64_t val,
  75                                  unsigned size)
  76 {
  77     handle_event(val);
  78 }
  79
  80 static const MemoryRegionOps pvpanic_ops = {
  81     .read = pvpanic_ioport_read,
  82     .write = pvpanic_ioport_write,
  83     .impl = {
  84         .min_access_size = 1,
  85         .max_access_size = 1,
  86     },
  87 };
  88
  89 static int pvpanic_isa_initfn(ISADevice *dev)
  90 {
  91     PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
  92     static bool port_configured;
  93     void *fw_cfg;
  94
  95     memory_region_init_io(&s->io, &pvpanic_ops, s, "pvpanic", 1);
  96     isa_register_ioport(dev, &s->io, s->ioport);
  97
  98     if (!port_configured) {
  99         fw_cfg = object_resolve_path("/machine/fw_cfg", NULL);
 100         if (fw_cfg) {
 101             fw_cfg_add_file(fw_cfg, "etc/pvpanic-port",
 102                             g_memdup(&s->ioport, sizeof(s->ioport)),
 103                             sizeof(s->ioport));
 104             port_configured = true;
 105         }
 106     }
 107
 108     return 0;
 109 }
 110
 111 int pvpanic_init(ISABus *bus)
 112 {
 113     isa_create_simple(bus, TYPE_ISA_PVPANIC_DEVICE);
 114     return 0;
 115 }
 116
 117 static Property pvpanic_isa_properties[] = {
 118     DEFINE_PROP_UINT16("ioport", PVPanicState, ioport, 0x505),
 119     DEFINE_PROP_END_OF_LIST(),
 120 };
 121
 122 static void pvpanic_isa_class_init(ObjectClass *klass, void *data)
 123 {
 124     DeviceClass *dc = DEVICE_CLASS(klass);
 125     ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
 126
 127     ic->init = pvpanic_isa_initfn;
 128     dc->no_user = 1;
 129     dc->props = pvpanic_isa_properties;
 130 }
 131
 132 static TypeInfo pvpanic_isa_info = {
 133     .name          = TYPE_ISA_PVPANIC_DEVICE,
 134     .parent        = TYPE_ISA_DEVICE,
 135     .instance_size = sizeof(PVPanicState),
 136     .class_init    = pvpanic_isa_class_init,
 137 };
 138
 139 static void pvpanic_register_types(void)
 140 {
 141     type_register_static(&pvpanic_isa_info);
 142 }
 143
 144 type_init(pvpanic_register_types)