target/riscv/kvm.c

   1 /*
   2  * RISC-V implementation of KVM hooks
   3  *
   4  * Copyright (c) 2020 Huawei Technologies Co., Ltd
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2 or later, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "qemu/osdep.h"
  20 #include <sys/ioctl.h>
  21
  22 #include <linux/kvm.h>
  23
  24 #include "qemu/timer.h"
  25 #include "qemu/error-report.h"
  26 #include "qemu/main-loop.h"
  27 #include "sysemu/sysemu.h"
  28 #include "sysemu/kvm.h"
  29 #include "sysemu/kvm_int.h"
  30 #include "cpu.h"
  31 #include "trace.h"
  32 #include "hw/pci/pci.h"
  33 #include "exec/memattrs.h"
  34 #include "exec/address-spaces.h"
  35 #include "hw/boards.h"
  36 #include "hw/irq.h"
  37 #include "qemu/log.h"
  38 #include "hw/loader.h"
  39 #include "kvm_riscv.h"
  40 #include "sbi_ecall_interface.h"
  41 #include "chardev/char-fe.h"
  42 #include "migration/migration.h"
  43 #include "sysemu/runstate.h"
  44
  45 static uint64_t kvm_riscv_reg_id(CPURISCVState *env, uint64_t type,
  46                                  uint64_t idx)
  47 {
  48     uint64_t id = KVM_REG_RISCV | type | idx;
  49
  50     switch (riscv_cpu_mxl(env)) {
  51     case MXL_RV32:
  52         id |= KVM_REG_SIZE_U32;
  53         break;
  54     case MXL_RV64:
  55         id |= KVM_REG_SIZE_U64;
  56         break;
  57     default:
  58         g_assert_not_reached();
  59     }
  60     return id;
  61 }
  62
  63 #define RISCV_CORE_REG(env, name)  kvm_riscv_reg_id(env, KVM_REG_RISCV_CORE, \
  64                  KVM_REG_RISCV_CORE_REG(name))
  65
  66 #define RISCV_CSR_REG(env, name)  kvm_riscv_reg_id(env, KVM_REG_RISCV_CSR, \
  67                  KVM_REG_RISCV_CSR_REG(name))
  68
  69 #define RISCV_TIMER_REG(env, name)  kvm_riscv_reg_id(env, KVM_REG_RISCV_TIMER, \
  70                  KVM_REG_RISCV_TIMER_REG(name))
  71
  72 #define RISCV_FP_F_REG(env, idx)  kvm_riscv_reg_id(env, KVM_REG_RISCV_FP_F, idx)
  73
  74 #define RISCV_FP_D_REG(env, idx)  kvm_riscv_reg_id(env, KVM_REG_RISCV_FP_D, idx)
  75
  76 #define KVM_RISCV_GET_CSR(cs, env, csr, reg) \
  77     do { \
  78         int ret = kvm_get_one_reg(cs, RISCV_CSR_REG(env, csr), &reg); \
  79         if (ret) { \
  80             return ret; \
  81         } \
  82     } while (0)
  83
  84 #define KVM_RISCV_SET_CSR(cs, env, csr, reg) \
  85     do { \
  86         int ret = kvm_set_one_reg(cs, RISCV_CSR_REG(env, csr), &reg); \
  87         if (ret) { \
  88             return ret; \
  89         } \
  90     } while (0)
  91
  92 #define KVM_RISCV_GET_TIMER(cs, env, name, reg) \
  93     do { \
  94         int ret = kvm_get_one_reg(cs, RISCV_TIMER_REG(env, name), &reg); \
  95         if (ret) { \
  96             abort(); \
  97         } \
  98     } while (0)
  99
 100 #define KVM_RISCV_SET_TIMER(cs, env, name, reg) \
 101     do { \
 102         int ret = kvm_set_one_reg(cs, RISCV_TIMER_REG(env, time), &reg); \
 103         if (ret) { \
 104             abort(); \
 105         } \
 106     } while (0)
 107
 108 static int kvm_riscv_get_regs_core(CPUState *cs)
 109 {
 110     int ret = 0;
 111     int i;
 112     target_ulong reg;
 113     CPURISCVState *env = &RISCV_CPU(cs)->env;
 114
 115     ret = kvm_get_one_reg(cs, RISCV_CORE_REG(env, regs.pc), &reg);
 116     if (ret) {
 117         return ret;
 118     }
 119     env->pc = reg;
 120
 121     for (i = 1; i < 32; i++) {
 122         uint64_t id = kvm_riscv_reg_id(env, KVM_REG_RISCV_CORE, i);
 123         ret = kvm_get_one_reg(cs, id, &reg);
 124         if (ret) {
 125             return ret;
 126         }
 127         env->gpr[i] = reg;
 128     }
 129
 130     return ret;
 131 }
 132
 133 static int kvm_riscv_put_regs_core(CPUState *cs)
 134 {
 135     int ret = 0;
 136     int i;
 137     target_ulong reg;
 138     CPURISCVState *env = &RISCV_CPU(cs)->env;
 139
 140     reg = env->pc;
 141     ret = kvm_set_one_reg(cs, RISCV_CORE_REG(env, regs.pc), &reg);
 142     if (ret) {
 143         return ret;
 144     }
 145
 146     for (i = 1; i < 32; i++) {
 147         uint64_t id = kvm_riscv_reg_id(env, KVM_REG_RISCV_CORE, i);
 148         reg = env->gpr[i];
 149         ret = kvm_set_one_reg(cs, id, &reg);
 150         if (ret) {
 151             return ret;
 152         }
 153     }
 154
 155     return ret;
 156 }
 157
 158 static int kvm_riscv_get_regs_csr(CPUState *cs)
 159 {
 160     int ret = 0;
 161     CPURISCVState *env = &RISCV_CPU(cs)->env;
 162
 163     KVM_RISCV_GET_CSR(cs, env, sstatus, env->mstatus);
 164     KVM_RISCV_GET_CSR(cs, env, sie, env->mie);
 165     KVM_RISCV_GET_CSR(cs, env, stvec, env->stvec);
 166     KVM_RISCV_GET_CSR(cs, env, sscratch, env->sscratch);
 167     KVM_RISCV_GET_CSR(cs, env, sepc, env->sepc);
 168     KVM_RISCV_GET_CSR(cs, env, scause, env->scause);
 169     KVM_RISCV_GET_CSR(cs, env, stval, env->stval);
 170     KVM_RISCV_GET_CSR(cs, env, sip, env->mip);
 171     KVM_RISCV_GET_CSR(cs, env, satp, env->satp);
 172     return ret;
 173 }
 174
 175 static int kvm_riscv_put_regs_csr(CPUState *cs)
 176 {
 177     int ret = 0;
 178     CPURISCVState *env = &RISCV_CPU(cs)->env;
 179
 180     KVM_RISCV_SET_CSR(cs, env, sstatus, env->mstatus);
 181     KVM_RISCV_SET_CSR(cs, env, sie, env->mie);
 182     KVM_RISCV_SET_CSR(cs, env, stvec, env->stvec);
 183     KVM_RISCV_SET_CSR(cs, env, sscratch, env->sscratch);
 184     KVM_RISCV_SET_CSR(cs, env, sepc, env->sepc);
 185     KVM_RISCV_SET_CSR(cs, env, scause, env->scause);
 186     KVM_RISCV_SET_CSR(cs, env, stval, env->stval);
 187     KVM_RISCV_SET_CSR(cs, env, sip, env->mip);
 188     KVM_RISCV_SET_CSR(cs, env, satp, env->satp);
 189
 190     return ret;
 191 }
 192
 193 static int kvm_riscv_get_regs_fp(CPUState *cs)
 194 {
 195     int ret = 0;
 196     int i;
 197     CPURISCVState *env = &RISCV_CPU(cs)->env;
 198
 199     if (riscv_has_ext(env, RVD)) {
 200         uint64_t reg;
 201         for (i = 0; i < 32; i++) {
 202             ret = kvm_get_one_reg(cs, RISCV_FP_D_REG(env, i), &reg);
 203             if (ret) {
 204                 return ret;
 205             }
 206             env->fpr[i] = reg;
 207         }
 208         return ret;
 209     }
 210
 211     if (riscv_has_ext(env, RVF)) {
 212         uint32_t reg;
 213         for (i = 0; i < 32; i++) {
 214             ret = kvm_get_one_reg(cs, RISCV_FP_F_REG(env, i), &reg);
 215             if (ret) {
 216                 return ret;
 217             }
 218             env->fpr[i] = reg;
 219         }
 220         return ret;
 221     }
 222
 223     return ret;
 224 }
 225
 226 static int kvm_riscv_put_regs_fp(CPUState *cs)
 227 {
 228     int ret = 0;
 229     int i;
 230     CPURISCVState *env = &RISCV_CPU(cs)->env;
 231
 232     if (riscv_has_ext(env, RVD)) {
 233         uint64_t reg;
 234         for (i = 0; i < 32; i++) {
 235             reg = env->fpr[i];
 236             ret = kvm_set_one_reg(cs, RISCV_FP_D_REG(env, i), &reg);
 237             if (ret) {
 238                 return ret;
 239             }
 240         }
 241         return ret;
 242     }
 243
 244     if (riscv_has_ext(env, RVF)) {
 245         uint32_t reg;
 246         for (i = 0; i < 32; i++) {
 247             reg = env->fpr[i];
 248             ret = kvm_set_one_reg(cs, RISCV_FP_F_REG(env, i), &reg);
 249             if (ret) {
 250                 return ret;
 251             }
 252         }
 253         return ret;
 254     }
 255
 256     return ret;
 257 }
 258
 259 static void kvm_riscv_get_regs_timer(CPUState *cs)
 260 {
 261     CPURISCVState *env = &RISCV_CPU(cs)->env;
 262
 263     if (env->kvm_timer_dirty) {
 264         return;
 265     }
 266
 267     KVM_RISCV_GET_TIMER(cs, env, time, env->kvm_timer_time);
 268     KVM_RISCV_GET_TIMER(cs, env, compare, env->kvm_timer_compare);
 269     KVM_RISCV_GET_TIMER(cs, env, state, env->kvm_timer_state);
 270     KVM_RISCV_GET_TIMER(cs, env, frequency, env->kvm_timer_frequency);
 271
 272     env->kvm_timer_dirty = true;
 273 }
 274
 275 static void kvm_riscv_put_regs_timer(CPUState *cs)
 276 {
 277     uint64_t reg;
 278     CPURISCVState *env = &RISCV_CPU(cs)->env;
 279
 280     if (!env->kvm_timer_dirty) {
 281         return;
 282     }
 283
 284     KVM_RISCV_SET_TIMER(cs, env, time, env->kvm_timer_time);
 285     KVM_RISCV_SET_TIMER(cs, env, compare, env->kvm_timer_compare);
 286
 287     /*
 288      * To set register of RISCV_TIMER_REG(state) will occur a error from KVM
 289      * on env->kvm_timer_state == 0, It's better to adapt in KVM, but it
 290      * doesn't matter that adaping in QEMU now.
 291      * TODO If KVM changes, adapt here.
 292      */
 293     if (env->kvm_timer_state) {
 294         KVM_RISCV_SET_TIMER(cs, env, state, env->kvm_timer_state);
 295     }
 296
 297     /*
 298      * For now, migration will not work between Hosts with different timer
 299      * frequency. Therefore, we should check whether they are the same here
 300      * during the migration.
 301      */
 302     if (migration_is_running(migrate_get_current()->state)) {
 303         KVM_RISCV_GET_TIMER(cs, env, frequency, reg);
 304         if (reg != env->kvm_timer_frequency) {
 305             error_report("Dst Hosts timer frequency != Src Hosts");
 306         }
 307     }
 308
 309     env->kvm_timer_dirty = false;
 310 }
 311
 312 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
 313     KVM_CAP_LAST_INFO
 314 };
 315
 316 int kvm_arch_get_registers(CPUState *cs)
 317 {
 318     int ret = 0;
 319
 320     ret = kvm_riscv_get_regs_core(cs);
 321     if (ret) {
 322         return ret;
 323     }
 324
 325     ret = kvm_riscv_get_regs_csr(cs);
 326     if (ret) {
 327         return ret;
 328     }
 329
 330     ret = kvm_riscv_get_regs_fp(cs);
 331     if (ret) {
 332         return ret;
 333     }
 334
 335     return ret;
 336 }
 337
 338 int kvm_arch_put_registers(CPUState *cs, int level)
 339 {
 340     int ret = 0;
 341
 342     ret = kvm_riscv_put_regs_core(cs);
 343     if (ret) {
 344         return ret;
 345     }
 346
 347     ret = kvm_riscv_put_regs_csr(cs);
 348     if (ret) {
 349         return ret;
 350     }
 351
 352     ret = kvm_riscv_put_regs_fp(cs);
 353     if (ret) {
 354         return ret;
 355     }
 356
 357     return ret;
 358 }
 359
 360 int kvm_arch_release_virq_post(int virq)
 361 {
 362     return 0;
 363 }
 364
 365 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
 366                              uint64_t address, uint32_t data, PCIDevice *dev)
 367 {
 368     return 0;
 369 }
 370
 371 int kvm_arch_destroy_vcpu(CPUState *cs)
 372 {
 373     return 0;
 374 }
 375
 376 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 377 {
 378     return cpu->cpu_index;
 379 }
 380
 381 static void kvm_riscv_vm_state_change(void *opaque, bool running,
 382                                       RunState state)
 383 {
 384     CPUState *cs = opaque;
 385
 386     if (running) {
 387         kvm_riscv_put_regs_timer(cs);
 388     } else {
 389         kvm_riscv_get_regs_timer(cs);
 390     }
 391 }
 392
 393 void kvm_arch_init_irq_routing(KVMState *s)
 394 {
 395 }
 396
 397 int kvm_arch_init_vcpu(CPUState *cs)
 398 {
 399     int ret = 0;
 400     target_ulong isa;
 401     RISCVCPU *cpu = RISCV_CPU(cs);
 402     CPURISCVState *env = &cpu->env;
 403     uint64_t id;
 404
 405     qemu_add_vm_change_state_handler(kvm_riscv_vm_state_change, cs);
 406
 407     id = kvm_riscv_reg_id(env, KVM_REG_RISCV_CONFIG,
 408                           KVM_REG_RISCV_CONFIG_REG(isa));
 409     ret = kvm_get_one_reg(cs, id, &isa);
 410     if (ret) {
 411         return ret;
 412     }
 413     env->misa_ext = isa;
 414
 415     return ret;
 416 }
 417
 418 int kvm_arch_msi_data_to_gsi(uint32_t data)
 419 {
 420     abort();
 421 }
 422
 423 int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
 424                                 int vector, PCIDevice *dev)
 425 {
 426     return 0;
 427 }
 428
 429 int kvm_arch_init(MachineState *ms, KVMState *s)
 430 {
 431     return 0;
 432 }
 433
 434 int kvm_arch_irqchip_create(KVMState *s)
 435 {
 436     return 0;
 437 }
 438
 439 int kvm_arch_process_async_events(CPUState *cs)
 440 {
 441     return 0;
 442 }
 443
 444 void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
 445 {
 446 }
 447
 448 MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
 449 {
 450     return MEMTXATTRS_UNSPECIFIED;
 451 }
 452
 453 bool kvm_arch_stop_on_emulation_error(CPUState *cs)
 454 {
 455     return true;
 456 }
 457
 458 static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
 459 {
 460     int ret = 0;
 461     unsigned char ch;
 462     switch (run->riscv_sbi.extension_id) {
 463     case SBI_EXT_0_1_CONSOLE_PUTCHAR:
 464         ch = run->riscv_sbi.args[0];
 465         qemu_chr_fe_write(serial_hd(0)->be, &ch, sizeof(ch));
 466         break;
 467     case SBI_EXT_0_1_CONSOLE_GETCHAR:
 468         ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
 469         if (ret == sizeof(ch)) {
 470             run->riscv_sbi.ret[0] = ch;
 471         } else {
 472             run->riscv_sbi.ret[0] = -1;
 473         }
 474         ret = 0;
 475         break;
 476     default:
 477         qemu_log_mask(LOG_UNIMP,
 478                       "%s: un-handled SBI EXIT, specific reasons is %lu\n",
 479                       __func__, run->riscv_sbi.extension_id);
 480         ret = -1;
 481         break;
 482     }
 483     return ret;
 484 }
 485
 486 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 487 {
 488     int ret = 0;
 489     switch (run->exit_reason) {
 490     case KVM_EXIT_RISCV_SBI:
 491         ret = kvm_riscv_handle_sbi(cs, run);
 492         break;
 493     default:
 494         qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n",
 495                       __func__, run->exit_reason);
 496         ret = -1;
 497         break;
 498     }
 499     return ret;
 500 }
 501
 502 void kvm_riscv_reset_vcpu(RISCVCPU *cpu)
 503 {
 504     CPURISCVState *env = &cpu->env;
 505
 506     if (!kvm_enabled()) {
 507         return;
 508     }
 509     env->pc = cpu->env.kernel_addr;
 510     env->gpr[10] = kvm_arch_vcpu_id(CPU(cpu)); /* a0 */
 511     env->gpr[11] = cpu->env.fdt_addr;          /* a1 */
 512     env->satp = 0;
 513 }
 514
 515 void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
 516 {
 517     int ret;
 518     unsigned virq = level ? KVM_INTERRUPT_SET : KVM_INTERRUPT_UNSET;
 519
 520     if (irq != IRQ_S_EXT) {
 521         perror("kvm riscv set irq != IRQ_S_EXT\n");
 522         abort();
 523     }
 524
 525     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_INTERRUPT, &virq);
 526     if (ret < 0) {
 527         perror("Set irq failed");
 528         abort();
 529     }
 530 }
 531
 532 bool kvm_arch_cpu_check_are_resettable(void)
 533 {
 534     return true;
 535 }
 536
 537 void kvm_arch_accel_class_init(ObjectClass *oc)
 538 {
 539 }