| 1 | /* |
| 2 | * QEMU System Emulator, accelerator interfaces |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright (c) 2014 Red Hat Inc. |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | * of this software and associated documentation files (the "Software"), to deal |
| 9 | * in the Software without restriction, including without limitation the rights |
| 10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | * copies of the Software, and to permit persons to whom the Software is |
| 12 | * furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included in |
| 15 | * all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 23 | * THE SOFTWARE. |
| 24 | */ |
| 25 | |
| 26 | #include "qemu/osdep.h" |
| 27 | #include "system/tcg.h" |
| 28 | #include "exec/replay-core.h" |
| 29 | #include "exec/icount.h" |
| 30 | #include "tcg/startup.h" |
| 31 | #include "qapi/error.h" |
| 32 | #include "qemu/error-report.h" |
| 33 | #include "qemu/accel.h" |
| 34 | #include "qemu/atomic.h" |
| 35 | #include "qapi/qapi-types-common.h" |
| 36 | #include "qapi/qapi-builtin-visit.h" |
| 37 | #include "qemu/units.h" |
| 38 | #include "qemu/target-info.h" |
| 39 | #ifndef CONFIG_USER_ONLY |
| 40 | #include "hw/core/boards.h" |
| 41 | #include "exec/tb-flush.h" |
| 42 | #include "system/runstate.h" |
| 43 | #endif |
| 44 | #include "accel/accel-ops.h" |
| 45 | #include "accel/accel-cpu-ops.h" |
| 46 | #include "accel/tcg/cpu-ops.h" |
| 47 | #include "internal-common.h" |
| 48 | |
| 49 | |
| 50 | struct TCGState { |
| 51 | AccelState parent_obj; |
| 52 | |
| 53 | OnOffAuto mttcg_enabled; |
| 54 | bool one_insn_per_tb; |
| 55 | int splitwx_enabled; |
| 56 | unsigned long tb_size; |
| 57 | }; |
| 58 | typedef struct TCGState TCGState; |
| 59 | |
| 60 | #define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg") |
| 61 | |
| 62 | DECLARE_INSTANCE_CHECKER(TCGState, TCG_STATE, |
| 63 | TYPE_TCG_ACCEL) |
| 64 | |
| 65 | #ifndef CONFIG_USER_ONLY |
| 66 | bool qemu_tcg_mttcg_enabled(void) |
| 67 | { |
| 68 | TCGState *s = TCG_STATE(current_accel()); |
| 69 | return s->mttcg_enabled == ON_OFF_AUTO_ON; |
| 70 | } |
| 71 | #endif /* !CONFIG_USER_ONLY */ |
| 72 | |
| 73 | static void tcg_accel_instance_init(Object *obj) |
| 74 | { |
| 75 | TCGState *s = TCG_STATE(obj); |
| 76 | |
| 77 | /* If debugging enabled, default "auto on", otherwise off. */ |
| 78 | #if defined(CONFIG_DEBUG_TCG) && !defined(CONFIG_USER_ONLY) |
| 79 | s->splitwx_enabled = -1; |
| 80 | #else |
| 81 | s->splitwx_enabled = 0; |
| 82 | #endif |
| 83 | } |
| 84 | |
| 85 | bool one_insn_per_tb; |
| 86 | |
| 87 | #ifndef CONFIG_USER_ONLY |
| 88 | static void tcg_vm_change_state(void *opaque, bool running, RunState state) |
| 89 | { |
| 90 | if (state == RUN_STATE_RESTORE_VM) { |
| 91 | /* |
| 92 | * loadvm will update the content of RAM, bypassing the usual |
| 93 | * mechanisms that ensure we flush TBs for writes to memory |
| 94 | * we've translated code from, so we must flush all TBs. |
| 95 | * |
| 96 | * vm_stop() has just stopped all cpus, so we are exclusive. |
| 97 | */ |
| 98 | assert(!running); |
| 99 | tb_flush__exclusive_or_serial(); |
| 100 | } |
| 101 | } |
| 102 | #endif |
| 103 | |
| 104 | static int tcg_init_machine(AccelState *as, MachineState *ms) |
| 105 | { |
| 106 | TCGState *s = TCG_STATE(as); |
| 107 | unsigned max_threads = 1; |
| 108 | |
| 109 | #ifndef CONFIG_USER_ONLY |
| 110 | CPUClass *cc = CPU_CLASS(object_class_by_name(target_cpu_type())); |
| 111 | bool mttcg_supported = cc->tcg_ops->mttcg_supported; |
| 112 | |
| 113 | switch (s->mttcg_enabled) { |
| 114 | case ON_OFF_AUTO_AUTO: |
| 115 | /* |
| 116 | * We default to false if we know other options have been enabled |
| 117 | * which are currently incompatible with MTTCG. Otherwise when each |
| 118 | * guest (target) has been updated to support: |
| 119 | * - atomic instructions |
| 120 | * - memory ordering primitives (barriers) |
| 121 | * they can set the appropriate CONFIG flags in ${target}-softmmu.mak |
| 122 | * |
| 123 | * Once a guest architecture has been converted to the new primitives |
| 124 | * there is one remaining limitation to check: |
| 125 | * - The guest can't be oversized (e.g. 64 bit guest on 32 bit host) |
| 126 | */ |
| 127 | if (mttcg_supported && !icount_enabled()) { |
| 128 | s->mttcg_enabled = ON_OFF_AUTO_ON; |
| 129 | max_threads = ms->smp.max_cpus; |
| 130 | } else { |
| 131 | s->mttcg_enabled = ON_OFF_AUTO_OFF; |
| 132 | } |
| 133 | break; |
| 134 | case ON_OFF_AUTO_ON: |
| 135 | if (!mttcg_supported) { |
| 136 | warn_report("Guest not yet converted to MTTCG - " |
| 137 | "you may get unexpected results"); |
| 138 | } |
| 139 | max_threads = ms->smp.max_cpus; |
| 140 | break; |
| 141 | case ON_OFF_AUTO_OFF: |
| 142 | break; |
| 143 | default: |
| 144 | g_assert_not_reached(); |
| 145 | } |
| 146 | |
| 147 | qemu_add_vm_change_state_handler(tcg_vm_change_state, NULL); |
| 148 | #endif |
| 149 | |
| 150 | tcg_allowed = true; |
| 151 | |
| 152 | as->gdbstub.sstep_flags = SSTEP_ENABLE; |
| 153 | if (replay_mode == REPLAY_MODE_NONE) { |
| 154 | /* |
| 155 | * In replay mode all events will come from the log and can't be |
| 156 | * suppressed otherwise we would break determinism. However as those |
| 157 | * events are tied to the number of executed instructions we won't see |
| 158 | * them occurring every time we single step. |
| 159 | */ |
| 160 | as->gdbstub.sstep_flags |= SSTEP_NOIRQ | SSTEP_NOTIMER; |
| 161 | } |
| 162 | if (replay_mode == REPLAY_MODE_PLAY) { |
| 163 | as->gdbstub.can_reverse = true; |
| 164 | } |
| 165 | |
| 166 | page_init(); |
| 167 | tb_htable_init(); |
| 168 | tcg_init(s->tb_size * MiB, s->splitwx_enabled, max_threads); |
| 169 | |
| 170 | #if defined(CONFIG_SOFTMMU) |
| 171 | /* |
| 172 | * There's no guest base to take into account, so go ahead and |
| 173 | * initialize the prologue now. |
| 174 | */ |
| 175 | tcg_prologue_init(); |
| 176 | #endif |
| 177 | |
| 178 | #ifdef CONFIG_USER_ONLY |
| 179 | qdev_create_fake_machine(); |
| 180 | #endif |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static char *tcg_get_thread(Object *obj, Error **errp) |
| 186 | { |
| 187 | TCGState *s = TCG_STATE(obj); |
| 188 | |
| 189 | return g_strdup(s->mttcg_enabled == ON_OFF_AUTO_ON ? "multi" : "single"); |
| 190 | } |
| 191 | |
| 192 | static void tcg_set_thread(Object *obj, const char *value, Error **errp) |
| 193 | { |
| 194 | TCGState *s = TCG_STATE(obj); |
| 195 | |
| 196 | if (strcmp(value, "multi") == 0) { |
| 197 | if (icount_enabled()) { |
| 198 | error_setg(errp, "No MTTCG when icount is enabled"); |
| 199 | } else { |
| 200 | s->mttcg_enabled = ON_OFF_AUTO_ON; |
| 201 | } |
| 202 | } else if (strcmp(value, "single") == 0) { |
| 203 | s->mttcg_enabled = ON_OFF_AUTO_OFF; |
| 204 | } else { |
| 205 | error_setg(errp, "Invalid 'thread' setting %s", value); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | static void tcg_get_tb_size(Object *obj, Visitor *v, |
| 210 | const char *name, void *opaque, |
| 211 | Error **errp) |
| 212 | { |
| 213 | TCGState *s = TCG_STATE(obj); |
| 214 | uint32_t value = s->tb_size; |
| 215 | |
| 216 | visit_type_uint32(v, name, &value, errp); |
| 217 | } |
| 218 | |
| 219 | static void tcg_set_tb_size(Object *obj, Visitor *v, |
| 220 | const char *name, void *opaque, |
| 221 | Error **errp) |
| 222 | { |
| 223 | TCGState *s = TCG_STATE(obj); |
| 224 | uint32_t value; |
| 225 | |
| 226 | if (!visit_type_uint32(v, name, &value, errp)) { |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | s->tb_size = value; |
| 231 | } |
| 232 | |
| 233 | static bool tcg_get_splitwx(Object *obj, Error **errp) |
| 234 | { |
| 235 | TCGState *s = TCG_STATE(obj); |
| 236 | return s->splitwx_enabled; |
| 237 | } |
| 238 | |
| 239 | static void tcg_set_splitwx(Object *obj, bool value, Error **errp) |
| 240 | { |
| 241 | TCGState *s = TCG_STATE(obj); |
| 242 | s->splitwx_enabled = value; |
| 243 | } |
| 244 | |
| 245 | static bool tcg_get_one_insn_per_tb(Object *obj, Error **errp) |
| 246 | { |
| 247 | TCGState *s = TCG_STATE(obj); |
| 248 | return s->one_insn_per_tb; |
| 249 | } |
| 250 | |
| 251 | static void tcg_set_one_insn_per_tb(Object *obj, bool value, Error **errp) |
| 252 | { |
| 253 | TCGState *s = TCG_STATE(obj); |
| 254 | s->one_insn_per_tb = value; |
| 255 | /* Set the global also: this changes the behaviour */ |
| 256 | qatomic_set(&one_insn_per_tb, value); |
| 257 | } |
| 258 | |
| 259 | static void tcg_accel_class_init(ObjectClass *oc, const void *data) |
| 260 | { |
| 261 | AccelClass *ac = ACCEL_CLASS(oc); |
| 262 | ac->name = "tcg"; |
| 263 | ac->init_machine = tcg_init_machine; |
| 264 | ac->cpu_common_realize = tcg_exec_realizefn; |
| 265 | ac->cpu_common_unrealize = tcg_exec_unrealizefn; |
| 266 | ac->get_stats = tcg_get_stats; |
| 267 | ac->allowed = &tcg_allowed; |
| 268 | |
| 269 | object_class_property_add_str(oc, "thread", |
| 270 | tcg_get_thread, |
| 271 | tcg_set_thread); |
| 272 | |
| 273 | object_class_property_add(oc, "tb-size", "int", |
| 274 | tcg_get_tb_size, tcg_set_tb_size, |
| 275 | NULL, NULL); |
| 276 | object_class_property_set_description(oc, "tb-size", |
| 277 | "TCG translation block cache size"); |
| 278 | |
| 279 | object_class_property_add_bool(oc, "split-wx", |
| 280 | tcg_get_splitwx, tcg_set_splitwx); |
| 281 | object_class_property_set_description(oc, "split-wx", |
| 282 | "Map jit pages into separate RW and RX regions"); |
| 283 | |
| 284 | object_class_property_add_bool(oc, "one-insn-per-tb", |
| 285 | tcg_get_one_insn_per_tb, |
| 286 | tcg_set_one_insn_per_tb); |
| 287 | object_class_property_set_description(oc, "one-insn-per-tb", |
| 288 | "Only put one guest insn in each translation block"); |
| 289 | } |
| 290 | |
| 291 | static const TypeInfo tcg_accel_type = { |
| 292 | .name = TYPE_TCG_ACCEL, |
| 293 | .parent = TYPE_ACCEL, |
| 294 | .instance_init = tcg_accel_instance_init, |
| 295 | .class_init = tcg_accel_class_init, |
| 296 | .instance_size = sizeof(TCGState), |
| 297 | }; |
| 298 | module_obj(TYPE_TCG_ACCEL); |
| 299 | |
| 300 | static void register_accel_types(void) |
| 301 | { |
| 302 | type_register_static(&tcg_accel_type); |
| 303 | } |
| 304 | |
| 305 | type_init(register_accel_types); |