hw/ppc/spapr_caps.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition capabilities handling
   3  *
   4  * Copyright (c) 2017 David Gibson, Red Hat Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu/error-report.h"
  27 #include "qapi/error.h"
  28 #include "qapi/visitor.h"
  29 #include "sysemu/hw_accel.h"
  30 #include "exec/ram_addr.h"
  31 #include "target/ppc/cpu.h"
  32 #include "target/ppc/mmu-hash64.h"
  33 #include "cpu-models.h"
  34 #include "kvm_ppc.h"
  35 #include "migration/vmstate.h"
  36 #include "sysemu/qtest.h"
  37 #include "sysemu/tcg.h"
  38
  39 #include "hw/ppc/spapr.h"
  40
  41 typedef struct SpaprCapPossible {
  42     int num;            /* size of vals array below */
  43     const char *help;   /* help text for vals */
  44     /*
  45      * Note:
  46      * - because of the way compatibility is determined vals MUST be ordered
  47      *   such that later options are a superset of all preceding options.
  48      * - the order of vals must be preserved, that is their index is important,
  49      *   however vals may be added to the end of the list so long as the above
  50      *   point is observed
  51      */
  52     const char *vals[];
  53 } SpaprCapPossible;
  54
  55 typedef struct SpaprCapabilityInfo {
  56     const char *name;
  57     const char *description;
  58     int index;
  59
  60     /* Getter and Setter Function Pointers */
  61     ObjectPropertyAccessor *get;
  62     ObjectPropertyAccessor *set;
  63     const char *type;
  64     /* Possible values if this is a custom string type */
  65     SpaprCapPossible *possible;
  66     /* Make sure the virtual hardware can support this capability */
  67     void (*apply)(SpaprMachineState *spapr, uint8_t val, Error **errp);
  68     void (*cpu_apply)(SpaprMachineState *spapr, PowerPCCPU *cpu,
  69                       uint8_t val, Error **errp);
  70     bool (*migrate_needed)(void *opaque);
  71 } SpaprCapabilityInfo;
  72
  73 static void spapr_cap_get_bool(Object *obj, Visitor *v, const char *name,
  74                                void *opaque, Error **errp)
  75 {
  76     SpaprCapabilityInfo *cap = opaque;
  77     SpaprMachineState *spapr = SPAPR_MACHINE(obj);
  78     bool value = spapr_get_cap(spapr, cap->index) == SPAPR_CAP_ON;
  79
  80     visit_type_bool(v, name, &value, errp);
  81 }
  82
  83 static void spapr_cap_set_bool(Object *obj, Visitor *v, const char *name,
  84                                void *opaque, Error **errp)
  85 {
  86     SpaprCapabilityInfo *cap = opaque;
  87     SpaprMachineState *spapr = SPAPR_MACHINE(obj);
  88     bool value;
  89     Error *local_err = NULL;
  90
  91     visit_type_bool(v, name, &value, &local_err);
  92     if (local_err) {
  93         error_propagate(errp, local_err);
  94         return;
  95     }
  96
  97     spapr->cmd_line_caps[cap->index] = true;
  98     spapr->eff.caps[cap->index] = value ? SPAPR_CAP_ON : SPAPR_CAP_OFF;
  99 }
 100
 101
 102 static void  spapr_cap_get_string(Object *obj, Visitor *v, const char *name,
 103                                   void *opaque, Error **errp)
 104 {
 105     SpaprCapabilityInfo *cap = opaque;
 106     SpaprMachineState *spapr = SPAPR_MACHINE(obj);
 107     char *val = NULL;
 108     uint8_t value = spapr_get_cap(spapr, cap->index);
 109
 110     if (value >= cap->possible->num) {
 111         error_setg(errp, "Invalid value (%d) for cap-%s", value, cap->name);
 112         return;
 113     }
 114
 115     val = g_strdup(cap->possible->vals[value]);
 116
 117     visit_type_str(v, name, &val, errp);
 118     g_free(val);
 119 }
 120
 121 static void spapr_cap_set_string(Object *obj, Visitor *v, const char *name,
 122                                  void *opaque, Error **errp)
 123 {
 124     SpaprCapabilityInfo *cap = opaque;
 125     SpaprMachineState *spapr = SPAPR_MACHINE(obj);
 126     Error *local_err = NULL;
 127     uint8_t i;
 128     char *val;
 129
 130     visit_type_str(v, name, &val, &local_err);
 131     if (local_err) {
 132         error_propagate(errp, local_err);
 133         return;
 134     }
 135
 136     if (!strcmp(val, "?")) {
 137         error_setg(errp, "%s", cap->possible->help);
 138         goto out;
 139     }
 140     for (i = 0; i < cap->possible->num; i++) {
 141         if (!strcasecmp(val, cap->possible->vals[i])) {
 142             spapr->cmd_line_caps[cap->index] = true;
 143             spapr->eff.caps[cap->index] = i;
 144             goto out;
 145         }
 146     }
 147
 148     error_setg(errp, "Invalid capability mode \"%s\" for cap-%s", val,
 149                cap->name);
 150 out:
 151     g_free(val);
 152 }
 153
 154 static void spapr_cap_get_pagesize(Object *obj, Visitor *v, const char *name,
 155                                    void *opaque, Error **errp)
 156 {
 157     SpaprCapabilityInfo *cap = opaque;
 158     SpaprMachineState *spapr = SPAPR_MACHINE(obj);
 159     uint8_t val = spapr_get_cap(spapr, cap->index);
 160     uint64_t pagesize = (1ULL << val);
 161
 162     visit_type_size(v, name, &pagesize, errp);
 163 }
 164
 165 static void spapr_cap_set_pagesize(Object *obj, Visitor *v, const char *name,
 166                                    void *opaque, Error **errp)
 167 {
 168     SpaprCapabilityInfo *cap = opaque;
 169     SpaprMachineState *spapr = SPAPR_MACHINE(obj);
 170     uint64_t pagesize;
 171     uint8_t val;
 172     Error *local_err = NULL;
 173
 174     visit_type_size(v, name, &pagesize, &local_err);
 175     if (local_err) {
 176         error_propagate(errp, local_err);
 177         return;
 178     }
 179
 180     if (!is_power_of_2(pagesize)) {
 181         error_setg(errp, "cap-%s must be a power of 2", cap->name);
 182         return;
 183     }
 184
 185     val = ctz64(pagesize);
 186     spapr->cmd_line_caps[cap->index] = true;
 187     spapr->eff.caps[cap->index] = val;
 188 }
 189
 190 static void cap_htm_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
 191 {
 192     if (!val) {
 193         /* TODO: We don't support disabling htm yet */
 194         return;
 195     }
 196     if (tcg_enabled()) {
 197         error_setg(errp,
 198                    "No Transactional Memory support in TCG,"
 199                    " try appending -machine cap-htm=off");
 200     } else if (kvm_enabled() && !kvmppc_has_cap_htm()) {
 201         error_setg(errp,
 202 "KVM implementation does not support Transactional Memory,"
 203                    " try appending -machine cap-htm=off"
 204             );
 205     }
 206 }
 207
 208 static void cap_vsx_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
 209 {
 210     PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
 211     CPUPPCState *env = &cpu->env;
 212
 213     if (!val) {
 214         /* TODO: We don't support disabling vsx yet */
 215         return;
 216     }
 217     /* Allowable CPUs in spapr_cpu_core.c should already have gotten
 218      * rid of anything that doesn't do VMX */
 219     g_assert(env->insns_flags & PPC_ALTIVEC);
 220     if (!(env->insns_flags2 & PPC2_VSX)) {
 221         error_setg(errp, "VSX support not available,"
 222                    " try appending -machine cap-vsx=off");
 223     }
 224 }
 225
 226 static void cap_dfp_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
 227 {
 228     PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
 229     CPUPPCState *env = &cpu->env;
 230
 231     if (!val) {
 232         /* TODO: We don't support disabling dfp yet */
 233         return;
 234     }
 235     if (!(env->insns_flags2 & PPC2_DFP)) {
 236         error_setg(errp, "DFP support not available,"
 237                    " try appending -machine cap-dfp=off");
 238     }
 239 }
 240
 241 SpaprCapPossible cap_cfpc_possible = {
 242     .num = 3,
 243     .vals = {"broken", "workaround", "fixed"},
 244     .help = "broken - no protection, workaround - workaround available,"
 245             " fixed - fixed in hardware",
 246 };
 247
 248 static void cap_safe_cache_apply(SpaprMachineState *spapr, uint8_t val,
 249                                  Error **errp)
 250 {
 251     uint8_t kvm_val =  kvmppc_get_cap_safe_cache();
 252
 253     if (tcg_enabled() && val) {
 254         /* TCG only supports broken, allow other values and print a warning */
 255         warn_report("TCG doesn't support requested feature, cap-cfpc=%s",
 256                     cap_cfpc_possible.vals[val]);
 257     } else if (kvm_enabled() && (val > kvm_val)) {
 258         error_setg(errp,
 259                    "Requested safe cache capability level not supported by kvm,"
 260                    " try appending -machine cap-cfpc=%s",
 261                    cap_cfpc_possible.vals[kvm_val]);
 262     }
 263 }
 264
 265 SpaprCapPossible cap_sbbc_possible = {
 266     .num = 3,
 267     .vals = {"broken", "workaround", "fixed"},
 268     .help = "broken - no protection, workaround - workaround available,"
 269             " fixed - fixed in hardware",
 270 };
 271
 272 static void cap_safe_bounds_check_apply(SpaprMachineState *spapr, uint8_t val,
 273                                         Error **errp)
 274 {
 275     uint8_t kvm_val =  kvmppc_get_cap_safe_bounds_check();
 276
 277     if (tcg_enabled() && val) {
 278         /* TCG only supports broken, allow other values and print a warning */
 279         warn_report("TCG doesn't support requested feature, cap-sbbc=%s",
 280                     cap_sbbc_possible.vals[val]);
 281     } else if (kvm_enabled() && (val > kvm_val)) {
 282         error_setg(errp,
 283 "Requested safe bounds check capability level not supported by kvm,"
 284                    " try appending -machine cap-sbbc=%s",
 285                    cap_sbbc_possible.vals[kvm_val]);
 286     }
 287 }
 288
 289 SpaprCapPossible cap_ibs_possible = {
 290     .num = 5,
 291     /* Note workaround only maintained for compatibility */
 292     .vals = {"broken", "workaround", "fixed-ibs", "fixed-ccd", "fixed-na"},
 293     .help = "broken - no protection, workaround - count cache flush"
 294             ", fixed-ibs - indirect branch serialisation,"
 295             " fixed-ccd - cache count disabled,"
 296             " fixed-na - fixed in hardware (no longer applicable)",
 297 };
 298
 299 static void cap_safe_indirect_branch_apply(SpaprMachineState *spapr,
 300                                            uint8_t val, Error **errp)
 301 {
 302     uint8_t kvm_val = kvmppc_get_cap_safe_indirect_branch();
 303
 304     if (tcg_enabled() && val) {
 305         /* TCG only supports broken, allow other values and print a warning */
 306         warn_report("TCG doesn't support requested feature, cap-ibs=%s",
 307                     cap_ibs_possible.vals[val]);
 308     } else if (kvm_enabled() && (val > kvm_val)) {
 309         error_setg(errp,
 310 "Requested safe indirect branch capability level not supported by kvm,"
 311                    " try appending -machine cap-ibs=%s",
 312                    cap_ibs_possible.vals[kvm_val]);
 313     }
 314 }
 315
 316 #define VALUE_DESC_TRISTATE     " (broken, workaround, fixed)"
 317
 318 void spapr_check_pagesize(SpaprMachineState *spapr, hwaddr pagesize,
 319                           Error **errp)
 320 {
 321     hwaddr maxpagesize = (1ULL << spapr->eff.caps[SPAPR_CAP_HPT_MAXPAGESIZE]);
 322
 323     if (!kvmppc_hpt_needs_host_contiguous_pages()) {
 324         return;
 325     }
 326
 327     if (maxpagesize > pagesize) {
 328         error_setg(errp,
 329                    "Can't support %"HWADDR_PRIu" kiB guest pages with %"
 330                    HWADDR_PRIu" kiB host pages with this KVM implementation",
 331                    maxpagesize >> 10, pagesize >> 10);
 332     }
 333 }
 334
 335 static void cap_hpt_maxpagesize_apply(SpaprMachineState *spapr,
 336                                       uint8_t val, Error **errp)
 337 {
 338     if (val < 12) {
 339         error_setg(errp, "Require at least 4kiB hpt-max-page-size");
 340         return;
 341     } else if (val < 16) {
 342         warn_report("Many guests require at least 64kiB hpt-max-page-size");
 343     }
 344
 345     spapr_check_pagesize(spapr, qemu_minrampagesize(), errp);
 346 }
 347
 348 static bool cap_hpt_maxpagesize_migrate_needed(void *opaque)
 349 {
 350     return !SPAPR_MACHINE_GET_CLASS(opaque)->pre_4_1_migration;
 351 }
 352
 353 static bool spapr_pagesize_cb(void *opaque, uint32_t seg_pshift,
 354                               uint32_t pshift)
 355 {
 356     unsigned maxshift = *((unsigned *)opaque);
 357
 358     assert(pshift >= seg_pshift);
 359
 360     /* Don't allow the guest to use pages bigger than the configured
 361      * maximum size */
 362     if (pshift > maxshift) {
 363         return false;
 364     }
 365
 366     /* For whatever reason, KVM doesn't allow multiple pagesizes
 367      * within a segment, *except* for the case of 16M pages in a 4k or
 368      * 64k segment.  Always exclude other cases, so that TCG and KVM
 369      * guests see a consistent environment */
 370     if ((pshift != seg_pshift) && (pshift != 24)) {
 371         return false;
 372     }
 373
 374     return true;
 375 }
 376
 377 static void cap_hpt_maxpagesize_cpu_apply(SpaprMachineState *spapr,
 378                                           PowerPCCPU *cpu,
 379                                           uint8_t val, Error **errp)
 380 {
 381     unsigned maxshift = val;
 382
 383     ppc_hash64_filter_pagesizes(cpu, spapr_pagesize_cb, &maxshift);
 384 }
 385
 386 static void cap_nested_kvm_hv_apply(SpaprMachineState *spapr,
 387                                     uint8_t val, Error **errp)
 388 {
 389     if (!val) {
 390         /* capability disabled by default */
 391         return;
 392     }
 393
 394     if (tcg_enabled()) {
 395         error_setg(errp,
 396                    "No Nested KVM-HV support in tcg,"
 397                    " try appending -machine cap-nested-hv=off");
 398     } else if (kvm_enabled()) {
 399         if (!kvmppc_has_cap_nested_kvm_hv()) {
 400             error_setg(errp,
 401 "KVM implementation does not support Nested KVM-HV,"
 402                        " try appending -machine cap-nested-hv=off");
 403         } else if (kvmppc_set_cap_nested_kvm_hv(val) < 0) {
 404                 error_setg(errp,
 405 "Error enabling cap-nested-hv with KVM, try cap-nested-hv=off");
 406         }
 407     }
 408 }
 409
 410 static void cap_large_decr_apply(SpaprMachineState *spapr,
 411                                  uint8_t val, Error **errp)
 412 {
 413     PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
 414     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 415
 416     if (!val) {
 417         return; /* Disabled by default */
 418     }
 419
 420     if (tcg_enabled()) {
 421         if (!ppc_check_compat(cpu, CPU_POWERPC_LOGICAL_3_00, 0,
 422                               spapr->max_compat_pvr)) {
 423             error_setg(errp,
 424                 "Large decrementer only supported on POWER9, try -cpu POWER9");
 425             return;
 426         }
 427     } else if (kvm_enabled()) {
 428         int kvm_nr_bits = kvmppc_get_cap_large_decr();
 429
 430         if (!kvm_nr_bits) {
 431             error_setg(errp,
 432                        "No large decrementer support,"
 433                         " try appending -machine cap-large-decr=off");
 434         } else if (pcc->lrg_decr_bits != kvm_nr_bits) {
 435             error_setg(errp,
 436 "KVM large decrementer size (%d) differs to model (%d),"
 437                 " try appending -machine cap-large-decr=off",
 438                 kvm_nr_bits, pcc->lrg_decr_bits);
 439         }
 440     }
 441 }
 442
 443 static void cap_large_decr_cpu_apply(SpaprMachineState *spapr,
 444                                      PowerPCCPU *cpu,
 445                                      uint8_t val, Error **errp)
 446 {
 447     CPUPPCState *env = &cpu->env;
 448     target_ulong lpcr = env->spr[SPR_LPCR];
 449
 450     if (kvm_enabled()) {
 451         if (kvmppc_enable_cap_large_decr(cpu, val)) {
 452             error_setg(errp,
 453                        "No large decrementer support,"
 454                        " try appending -machine cap-large-decr=off");
 455         }
 456     }
 457
 458     if (val) {
 459         lpcr |= LPCR_LD;
 460     } else {
 461         lpcr &= ~LPCR_LD;
 462     }
 463     ppc_store_lpcr(cpu, lpcr);
 464 }
 465
 466 static void cap_ccf_assist_apply(SpaprMachineState *spapr, uint8_t val,
 467                                  Error **errp)
 468 {
 469     uint8_t kvm_val = kvmppc_get_cap_count_cache_flush_assist();
 470
 471     if (tcg_enabled() && val) {
 472         /* TCG doesn't implement anything here, but allow with a warning */
 473         warn_report("TCG doesn't support requested feature, cap-ccf-assist=on");
 474     } else if (kvm_enabled() && (val > kvm_val)) {
 475         uint8_t kvm_ibs = kvmppc_get_cap_safe_indirect_branch();
 476
 477         if (kvm_ibs == SPAPR_CAP_FIXED_CCD) {
 478             /*
 479              * If we don't have CCF assist on the host, the assist
 480              * instruction is a harmless no-op.  It won't correctly
 481              * implement the cache count flush *but* if we have
 482              * count-cache-disabled in the host, that flush is
 483              * unnnecessary.  So, specifically allow this case.  This
 484              * allows us to have better performance on POWER9 DD2.3,
 485              * while still working on POWER9 DD2.2 and POWER8 host
 486              * cpus.
 487              */
 488             return;
 489         }
 490         error_setg(errp,
 491 "Requested count cache flush assist capability level not supported by kvm,"
 492                    " try appending -machine cap-ccf-assist=off");
 493     }
 494 }
 495
 496 static void cap_fwnmi_apply(SpaprMachineState *spapr, uint8_t val,
 497                                 Error **errp)
 498 {
 499     if (!val) {
 500         return; /* Disabled by default */
 501     }
 502
 503     if (kvm_enabled()) {
 504         if (!kvmppc_get_fwnmi()) {
 505             error_setg(errp,
 506 "Firmware Assisted Non-Maskable Interrupts(FWNMI) not supported by KVM.");
 507             error_append_hint(errp, "Try appending -machine cap-fwnmi=off\n");
 508         }
 509     }
 510 }
 511
 512 SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
 513     [SPAPR_CAP_HTM] = {
 514         .name = "htm",
 515         .description = "Allow Hardware Transactional Memory (HTM)",
 516         .index = SPAPR_CAP_HTM,
 517         .get = spapr_cap_get_bool,
 518         .set = spapr_cap_set_bool,
 519         .type = "bool",
 520         .apply = cap_htm_apply,
 521     },
 522     [SPAPR_CAP_VSX] = {
 523         .name = "vsx",
 524         .description = "Allow Vector Scalar Extensions (VSX)",
 525         .index = SPAPR_CAP_VSX,
 526         .get = spapr_cap_get_bool,
 527         .set = spapr_cap_set_bool,
 528         .type = "bool",
 529         .apply = cap_vsx_apply,
 530     },
 531     [SPAPR_CAP_DFP] = {
 532         .name = "dfp",
 533         .description = "Allow Decimal Floating Point (DFP)",
 534         .index = SPAPR_CAP_DFP,
 535         .get = spapr_cap_get_bool,
 536         .set = spapr_cap_set_bool,
 537         .type = "bool",
 538         .apply = cap_dfp_apply,
 539     },
 540     [SPAPR_CAP_CFPC] = {
 541         .name = "cfpc",
 542         .description = "Cache Flush on Privilege Change" VALUE_DESC_TRISTATE,
 543         .index = SPAPR_CAP_CFPC,
 544         .get = spapr_cap_get_string,
 545         .set = spapr_cap_set_string,
 546         .type = "string",
 547         .possible = &cap_cfpc_possible,
 548         .apply = cap_safe_cache_apply,
 549     },
 550     [SPAPR_CAP_SBBC] = {
 551         .name = "sbbc",
 552         .description = "Speculation Barrier Bounds Checking" VALUE_DESC_TRISTATE,
 553         .index = SPAPR_CAP_SBBC,
 554         .get = spapr_cap_get_string,
 555         .set = spapr_cap_set_string,
 556         .type = "string",
 557         .possible = &cap_sbbc_possible,
 558         .apply = cap_safe_bounds_check_apply,
 559     },
 560     [SPAPR_CAP_IBS] = {
 561         .name = "ibs",
 562         .description =
 563             "Indirect Branch Speculation (broken, workaround, fixed-ibs,"
 564             "fixed-ccd, fixed-na)",
 565         .index = SPAPR_CAP_IBS,
 566         .get = spapr_cap_get_string,
 567         .set = spapr_cap_set_string,
 568         .type = "string",
 569         .possible = &cap_ibs_possible,
 570         .apply = cap_safe_indirect_branch_apply,
 571     },
 572     [SPAPR_CAP_HPT_MAXPAGESIZE] = {
 573         .name = "hpt-max-page-size",
 574         .description = "Maximum page size for Hash Page Table guests",
 575         .index = SPAPR_CAP_HPT_MAXPAGESIZE,
 576         .get = spapr_cap_get_pagesize,
 577         .set = spapr_cap_set_pagesize,
 578         .type = "int",
 579         .apply = cap_hpt_maxpagesize_apply,
 580         .cpu_apply = cap_hpt_maxpagesize_cpu_apply,
 581         .migrate_needed = cap_hpt_maxpagesize_migrate_needed,
 582     },
 583     [SPAPR_CAP_NESTED_KVM_HV] = {
 584         .name = "nested-hv",
 585         .description = "Allow Nested KVM-HV",
 586         .index = SPAPR_CAP_NESTED_KVM_HV,
 587         .get = spapr_cap_get_bool,
 588         .set = spapr_cap_set_bool,
 589         .type = "bool",
 590         .apply = cap_nested_kvm_hv_apply,
 591     },
 592     [SPAPR_CAP_LARGE_DECREMENTER] = {
 593         .name = "large-decr",
 594         .description = "Allow Large Decrementer",
 595         .index = SPAPR_CAP_LARGE_DECREMENTER,
 596         .get = spapr_cap_get_bool,
 597         .set = spapr_cap_set_bool,
 598         .type = "bool",
 599         .apply = cap_large_decr_apply,
 600         .cpu_apply = cap_large_decr_cpu_apply,
 601     },
 602     [SPAPR_CAP_CCF_ASSIST] = {
 603         .name = "ccf-assist",
 604         .description = "Count Cache Flush Assist via HW Instruction",
 605         .index = SPAPR_CAP_CCF_ASSIST,
 606         .get = spapr_cap_get_bool,
 607         .set = spapr_cap_set_bool,
 608         .type = "bool",
 609         .apply = cap_ccf_assist_apply,
 610     },
 611     [SPAPR_CAP_FWNMI] = {
 612         .name = "fwnmi",
 613         .description = "Implements PAPR FWNMI option",
 614         .index = SPAPR_CAP_FWNMI,
 615         .get = spapr_cap_get_bool,
 616         .set = spapr_cap_set_bool,
 617         .type = "bool",
 618         .apply = cap_fwnmi_apply,
 619     },
 620 };
 621
 622 static SpaprCapabilities default_caps_with_cpu(SpaprMachineState *spapr,
 623                                                const char *cputype)
 624 {
 625     SpaprMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
 626     SpaprCapabilities caps;
 627
 628     caps = smc->default_caps;
 629
 630     if (!ppc_type_check_compat(cputype, CPU_POWERPC_LOGICAL_3_00,
 631                                0, spapr->max_compat_pvr)) {
 632         caps.caps[SPAPR_CAP_LARGE_DECREMENTER] = SPAPR_CAP_OFF;
 633     }
 634
 635     if (!ppc_type_check_compat(cputype, CPU_POWERPC_LOGICAL_2_07,
 636                                0, spapr->max_compat_pvr)) {
 637         caps.caps[SPAPR_CAP_HTM] = SPAPR_CAP_OFF;
 638         caps.caps[SPAPR_CAP_CFPC] = SPAPR_CAP_BROKEN;
 639     }
 640
 641     if (!ppc_type_check_compat(cputype, CPU_POWERPC_LOGICAL_2_06_PLUS,
 642                                0, spapr->max_compat_pvr)) {
 643         caps.caps[SPAPR_CAP_SBBC] = SPAPR_CAP_BROKEN;
 644     }
 645
 646     if (!ppc_type_check_compat(cputype, CPU_POWERPC_LOGICAL_2_06,
 647                                0, spapr->max_compat_pvr)) {
 648         caps.caps[SPAPR_CAP_VSX] = SPAPR_CAP_OFF;
 649         caps.caps[SPAPR_CAP_DFP] = SPAPR_CAP_OFF;
 650         caps.caps[SPAPR_CAP_IBS] = SPAPR_CAP_BROKEN;
 651     }
 652
 653     /* This is for pseries-2.12 and older */
 654     if (smc->default_caps.caps[SPAPR_CAP_HPT_MAXPAGESIZE] == 0) {
 655         uint8_t mps;
 656
 657         if (kvmppc_hpt_needs_host_contiguous_pages()) {
 658             mps = ctz64(qemu_minrampagesize());
 659         } else {
 660             mps = 34; /* allow everything up to 16GiB, i.e. everything */
 661         }
 662
 663         caps.caps[SPAPR_CAP_HPT_MAXPAGESIZE] = mps;
 664     }
 665
 666     return caps;
 667 }
 668
 669 int spapr_caps_pre_load(void *opaque)
 670 {
 671     SpaprMachineState *spapr = opaque;
 672
 673     /* Set to default so we can tell if this came in with the migration */
 674     spapr->mig = spapr->def;
 675     return 0;
 676 }
 677
 678 int spapr_caps_pre_save(void *opaque)
 679 {
 680     SpaprMachineState *spapr = opaque;
 681
 682     spapr->mig = spapr->eff;
 683     return 0;
 684 }
 685
 686 /* This has to be called from the top-level spapr post_load, not the
 687  * caps specific one.  Otherwise it wouldn't be called when the source
 688  * caps are all defaults, which could still conflict with overridden
 689  * caps on the destination */
 690 int spapr_caps_post_migration(SpaprMachineState *spapr)
 691 {
 692     int i;
 693     bool ok = true;
 694     SpaprCapabilities dstcaps = spapr->eff;
 695     SpaprCapabilities srccaps;
 696
 697     srccaps = default_caps_with_cpu(spapr, MACHINE(spapr)->cpu_type);
 698     for (i = 0; i < SPAPR_CAP_NUM; i++) {
 699         /* If not default value then assume came in with the migration */
 700         if (spapr->mig.caps[i] != spapr->def.caps[i]) {
 701             srccaps.caps[i] = spapr->mig.caps[i];
 702         }
 703     }
 704
 705     for (i = 0; i < SPAPR_CAP_NUM; i++) {
 706         SpaprCapabilityInfo *info = &capability_table[i];
 707
 708         if (srccaps.caps[i] > dstcaps.caps[i]) {
 709             error_report("cap-%s higher level (%d) in incoming stream than on destination (%d)",
 710                          info->name, srccaps.caps[i], dstcaps.caps[i]);
 711             ok = false;
 712         }
 713
 714         if (srccaps.caps[i] < dstcaps.caps[i]) {
 715             warn_report("cap-%s lower level (%d) in incoming stream than on destination (%d)",
 716                          info->name, srccaps.caps[i], dstcaps.caps[i]);
 717         }
 718     }
 719
 720     return ok ? 0 : -EINVAL;
 721 }
 722
 723 /* Used to generate the migration field and needed function for a spapr cap */
 724 #define SPAPR_CAP_MIG_STATE(sname, cap)                 \
 725 static bool spapr_cap_##sname##_needed(void *opaque)    \
 726 {                                                       \
 727     SpaprMachineState *spapr = opaque;                  \
 728     bool (*needed)(void *opaque) =                      \
 729         capability_table[cap].migrate_needed;           \
 730                                                         \
 731     return needed ? needed(opaque) : true &&            \
 732            spapr->cmd_line_caps[cap] &&                 \
 733            (spapr->eff.caps[cap] !=                     \
 734             spapr->def.caps[cap]);                      \
 735 }                                                       \
 736                                                         \
 737 const VMStateDescription vmstate_spapr_cap_##sname = {  \
 738     .name = "spapr/cap/" #sname,                        \
 739     .version_id = 1,                                    \
 740     .minimum_version_id = 1,                            \
 741     .needed = spapr_cap_##sname##_needed,               \
 742     .fields = (VMStateField[]) {                        \
 743         VMSTATE_UINT8(mig.caps[cap],                    \
 744                       SpaprMachineState),               \
 745         VMSTATE_END_OF_LIST()                           \
 746     },                                                  \
 747 }
 748
 749 SPAPR_CAP_MIG_STATE(htm, SPAPR_CAP_HTM);
 750 SPAPR_CAP_MIG_STATE(vsx, SPAPR_CAP_VSX);
 751 SPAPR_CAP_MIG_STATE(dfp, SPAPR_CAP_DFP);
 752 SPAPR_CAP_MIG_STATE(cfpc, SPAPR_CAP_CFPC);
 753 SPAPR_CAP_MIG_STATE(sbbc, SPAPR_CAP_SBBC);
 754 SPAPR_CAP_MIG_STATE(ibs, SPAPR_CAP_IBS);
 755 SPAPR_CAP_MIG_STATE(hpt_maxpagesize, SPAPR_CAP_HPT_MAXPAGESIZE);
 756 SPAPR_CAP_MIG_STATE(nested_kvm_hv, SPAPR_CAP_NESTED_KVM_HV);
 757 SPAPR_CAP_MIG_STATE(large_decr, SPAPR_CAP_LARGE_DECREMENTER);
 758 SPAPR_CAP_MIG_STATE(ccf_assist, SPAPR_CAP_CCF_ASSIST);
 759 SPAPR_CAP_MIG_STATE(fwnmi, SPAPR_CAP_FWNMI);
 760
 761 void spapr_caps_init(SpaprMachineState *spapr)
 762 {
 763     SpaprCapabilities default_caps;
 764     int i;
 765
 766     /* Compute the actual set of caps we should run with */
 767     default_caps = default_caps_with_cpu(spapr, MACHINE(spapr)->cpu_type);
 768
 769     for (i = 0; i < SPAPR_CAP_NUM; i++) {
 770         /* Store the defaults */
 771         spapr->def.caps[i] = default_caps.caps[i];
 772         /* If not set on the command line then apply the default value */
 773         if (!spapr->cmd_line_caps[i]) {
 774             spapr->eff.caps[i] = default_caps.caps[i];
 775         }
 776     }
 777 }
 778
 779 void spapr_caps_apply(SpaprMachineState *spapr)
 780 {
 781     int i;
 782
 783     for (i = 0; i < SPAPR_CAP_NUM; i++) {
 784         SpaprCapabilityInfo *info = &capability_table[i];
 785
 786         /*
 787          * If the apply function can't set the desired level and thinks it's
 788          * fatal, it should cause that.
 789          */
 790         info->apply(spapr, spapr->eff.caps[i], &error_fatal);
 791     }
 792 }
 793
 794 void spapr_caps_cpu_apply(SpaprMachineState *spapr, PowerPCCPU *cpu)
 795 {
 796     int i;
 797
 798     for (i = 0; i < SPAPR_CAP_NUM; i++) {
 799         SpaprCapabilityInfo *info = &capability_table[i];
 800
 801         /*
 802          * If the apply function can't set the desired level and thinks it's
 803          * fatal, it should cause that.
 804          */
 805         if (info->cpu_apply) {
 806             info->cpu_apply(spapr, cpu, spapr->eff.caps[i], &error_fatal);
 807         }
 808     }
 809 }
 810
 811 void spapr_caps_add_properties(SpaprMachineClass *smc)
 812 {
 813     ObjectClass *klass = OBJECT_CLASS(smc);
 814     int i;
 815
 816     for (i = 0; i < ARRAY_SIZE(capability_table); i++) {
 817         SpaprCapabilityInfo *cap = &capability_table[i];
 818         char *name = g_strdup_printf("cap-%s", cap->name);
 819         char *desc;
 820
 821         object_class_property_add(klass, name, cap->type,
 822                                   cap->get, cap->set,
 823                                   NULL, cap);
 824
 825         desc = g_strdup_printf("%s", cap->description);
 826         object_class_property_set_description(klass, name, desc);
 827         g_free(name);
 828         g_free(desc);
 829     }
 830 }