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