arch/powerpc/kvm/book3s_pr_papr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2011. Freescale Inc. All rights reserved.
   4  *
   5  * Authors:
   6  *    Alexander Graf <agraf@suse.de>
   7  *    Paul Mackerras <paulus@samba.org>
   8  *
   9  * Description:
  10  *
  11  * Hypercall handling for running PAPR guests in PR KVM on Book 3S
  12  * processors.
  13  */
  14
  15 #include <linux/anon_inodes.h>
  16
  17 #include <linux/uaccess.h>
  18 #include <asm/kvm_ppc.h>
  19 #include <asm/kvm_book3s.h>
  20
  21 #define HPTE_SIZE       16              /* bytes per HPT entry */
  22
  23 static unsigned long get_pteg_addr(struct kvm_vcpu *vcpu, long pte_index)
  24 {
  25         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
  26         unsigned long pteg_addr;
  27
  28         pte_index <<= 4;
  29         pte_index &= ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1) << 7 | 0x70;
  30         pteg_addr = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
  31         pteg_addr |= pte_index;
  32
  33         return pteg_addr;
  34 }
  35
  36 static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
  37 {
  38         long flags = kvmppc_get_gpr(vcpu, 4);
  39         long pte_index = kvmppc_get_gpr(vcpu, 5);
  40         __be64 pteg[2 * 8];
  41         __be64 *hpte;
  42         unsigned long pteg_addr, i;
  43         long int ret;
  44
  45         i = pte_index & 7;
  46         pte_index &= ~7UL;
  47         pteg_addr = get_pteg_addr(vcpu, pte_index);
  48
  49         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
  50         ret = H_FUNCTION;
  51         if (copy_from_user(pteg, (void __user *)pteg_addr, sizeof(pteg)))
  52                 goto done;
  53         hpte = pteg;
  54
  55         ret = H_PTEG_FULL;
  56         if (likely((flags & H_EXACT) == 0)) {
  57                 for (i = 0; ; ++i) {
  58                         if (i == 8)
  59                                 goto done;
  60                         if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0)
  61                                 break;
  62                         hpte += 2;
  63                 }
  64         } else {
  65                 hpte += i * 2;
  66                 if (*hpte & HPTE_V_VALID)
  67                         goto done;
  68         }
  69
  70         hpte[0] = cpu_to_be64(kvmppc_get_gpr(vcpu, 6));
  71         hpte[1] = cpu_to_be64(kvmppc_get_gpr(vcpu, 7));
  72         pteg_addr += i * HPTE_SIZE;
  73         ret = H_FUNCTION;
  74         if (copy_to_user((void __user *)pteg_addr, hpte, HPTE_SIZE))
  75                 goto done;
  76         kvmppc_set_gpr(vcpu, 4, pte_index | i);
  77         ret = H_SUCCESS;
  78
  79  done:
  80         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
  81         kvmppc_set_gpr(vcpu, 3, ret);
  82
  83         return EMULATE_DONE;
  84 }
  85
  86 static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu)
  87 {
  88         unsigned long flags= kvmppc_get_gpr(vcpu, 4);
  89         unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
  90         unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
  91         unsigned long v = 0, pteg, rb;
  92         unsigned long pte[2];
  93         long int ret;
  94
  95         pteg = get_pteg_addr(vcpu, pte_index);
  96         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
  97         ret = H_FUNCTION;
  98         if (copy_from_user(pte, (void __user *)pteg, sizeof(pte)))
  99                 goto done;
 100         pte[0] = be64_to_cpu((__force __be64)pte[0]);
 101         pte[1] = be64_to_cpu((__force __be64)pte[1]);
 102
 103         ret = H_NOT_FOUND;
 104         if ((pte[0] & HPTE_V_VALID) == 0 ||
 105             ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn) ||
 106             ((flags & H_ANDCOND) && (pte[0] & avpn) != 0))
 107                 goto done;
 108
 109         ret = H_FUNCTION;
 110         if (copy_to_user((void __user *)pteg, &v, sizeof(v)))
 111                 goto done;
 112
 113         rb = compute_tlbie_rb(pte[0], pte[1], pte_index);
 114         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 115
 116         ret = H_SUCCESS;
 117         kvmppc_set_gpr(vcpu, 4, pte[0]);
 118         kvmppc_set_gpr(vcpu, 5, pte[1]);
 119
 120  done:
 121         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
 122         kvmppc_set_gpr(vcpu, 3, ret);
 123
 124         return EMULATE_DONE;
 125 }
 126
 127 /* Request defs for kvmppc_h_pr_bulk_remove() */
 128 #define H_BULK_REMOVE_TYPE             0xc000000000000000ULL
 129 #define   H_BULK_REMOVE_REQUEST        0x4000000000000000ULL
 130 #define   H_BULK_REMOVE_RESPONSE       0x8000000000000000ULL
 131 #define   H_BULK_REMOVE_END            0xc000000000000000ULL
 132 #define H_BULK_REMOVE_CODE             0x3000000000000000ULL
 133 #define   H_BULK_REMOVE_SUCCESS        0x0000000000000000ULL
 134 #define   H_BULK_REMOVE_NOT_FOUND      0x1000000000000000ULL
 135 #define   H_BULK_REMOVE_PARM           0x2000000000000000ULL
 136 #define   H_BULK_REMOVE_HW             0x3000000000000000ULL
 137 #define H_BULK_REMOVE_RC               0x0c00000000000000ULL
 138 #define H_BULK_REMOVE_FLAGS            0x0300000000000000ULL
 139 #define   H_BULK_REMOVE_ABSOLUTE       0x0000000000000000ULL
 140 #define   H_BULK_REMOVE_ANDCOND        0x0100000000000000ULL
 141 #define   H_BULK_REMOVE_AVPN           0x0200000000000000ULL
 142 #define H_BULK_REMOVE_PTEX             0x00ffffffffffffffULL
 143 #define H_BULK_REMOVE_MAX_BATCH        4
 144
 145 static int kvmppc_h_pr_bulk_remove(struct kvm_vcpu *vcpu)
 146 {
 147         int i;
 148         int paramnr = 4;
 149         int ret = H_SUCCESS;
 150
 151         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
 152         for (i = 0; i < H_BULK_REMOVE_MAX_BATCH; i++) {
 153                 unsigned long tsh = kvmppc_get_gpr(vcpu, paramnr+(2*i));
 154                 unsigned long tsl = kvmppc_get_gpr(vcpu, paramnr+(2*i)+1);
 155                 unsigned long pteg, rb, flags;
 156                 unsigned long pte[2];
 157                 unsigned long v = 0;
 158
 159                 if ((tsh & H_BULK_REMOVE_TYPE) == H_BULK_REMOVE_END) {
 160                         break; /* Exit success */
 161                 } else if ((tsh & H_BULK_REMOVE_TYPE) !=
 162                            H_BULK_REMOVE_REQUEST) {
 163                         ret = H_PARAMETER;
 164                         break; /* Exit fail */
 165                 }
 166
 167                 tsh &= H_BULK_REMOVE_PTEX | H_BULK_REMOVE_FLAGS;
 168                 tsh |= H_BULK_REMOVE_RESPONSE;
 169
 170                 if ((tsh & H_BULK_REMOVE_ANDCOND) &&
 171                     (tsh & H_BULK_REMOVE_AVPN)) {
 172                         tsh |= H_BULK_REMOVE_PARM;
 173                         kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
 174                         ret = H_PARAMETER;
 175                         break; /* Exit fail */
 176                 }
 177
 178                 pteg = get_pteg_addr(vcpu, tsh & H_BULK_REMOVE_PTEX);
 179                 if (copy_from_user(pte, (void __user *)pteg, sizeof(pte))) {
 180                         ret = H_FUNCTION;
 181                         break;
 182                 }
 183                 pte[0] = be64_to_cpu((__force __be64)pte[0]);
 184                 pte[1] = be64_to_cpu((__force __be64)pte[1]);
 185
 186                 /* tsl = AVPN */
 187                 flags = (tsh & H_BULK_REMOVE_FLAGS) >> 26;
 188
 189                 if ((pte[0] & HPTE_V_VALID) == 0 ||
 190                     ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != tsl) ||
 191                     ((flags & H_ANDCOND) && (pte[0] & tsl) != 0)) {
 192                         tsh |= H_BULK_REMOVE_NOT_FOUND;
 193                 } else {
 194                         /* Splat the pteg in (userland) hpt */
 195                         if (copy_to_user((void __user *)pteg, &v, sizeof(v))) {
 196                                 ret = H_FUNCTION;
 197                                 break;
 198                         }
 199
 200                         rb = compute_tlbie_rb(pte[0], pte[1],
 201                                               tsh & H_BULK_REMOVE_PTEX);
 202                         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 203                         tsh |= H_BULK_REMOVE_SUCCESS;
 204                         tsh |= (pte[1] & (HPTE_R_C | HPTE_R_R)) << 43;
 205                 }
 206                 kvmppc_set_gpr(vcpu, paramnr+(2*i), tsh);
 207         }
 208         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
 209         kvmppc_set_gpr(vcpu, 3, ret);
 210
 211         return EMULATE_DONE;
 212 }
 213
 214 static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
 215 {
 216         unsigned long flags = kvmppc_get_gpr(vcpu, 4);
 217         unsigned long pte_index = kvmppc_get_gpr(vcpu, 5);
 218         unsigned long avpn = kvmppc_get_gpr(vcpu, 6);
 219         unsigned long rb, pteg, r, v;
 220         unsigned long pte[2];
 221         long int ret;
 222
 223         pteg = get_pteg_addr(vcpu, pte_index);
 224         mutex_lock(&vcpu->kvm->arch.hpt_mutex);
 225         ret = H_FUNCTION;
 226         if (copy_from_user(pte, (void __user *)pteg, sizeof(pte)))
 227                 goto done;
 228         pte[0] = be64_to_cpu((__force __be64)pte[0]);
 229         pte[1] = be64_to_cpu((__force __be64)pte[1]);
 230
 231         ret = H_NOT_FOUND;
 232         if ((pte[0] & HPTE_V_VALID) == 0 ||
 233             ((flags & H_AVPN) && (pte[0] & ~0x7fUL) != avpn))
 234                 goto done;
 235
 236         v = pte[0];
 237         r = pte[1];
 238         r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_HI |
 239                HPTE_R_KEY_LO);
 240         r |= (flags << 55) & HPTE_R_PP0;
 241         r |= (flags << 48) & HPTE_R_KEY_HI;
 242         r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
 243
 244         pte[1] = r;
 245
 246         rb = compute_tlbie_rb(v, r, pte_index);
 247         vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
 248         pte[0] = (__force u64)cpu_to_be64(pte[0]);
 249         pte[1] = (__force u64)cpu_to_be64(pte[1]);
 250         ret = H_FUNCTION;
 251         if (copy_to_user((void __user *)pteg, pte, sizeof(pte)))
 252                 goto done;
 253         ret = H_SUCCESS;
 254
 255  done:
 256         mutex_unlock(&vcpu->kvm->arch.hpt_mutex);
 257         kvmppc_set_gpr(vcpu, 3, ret);
 258
 259         return EMULATE_DONE;
 260 }
 261
 262 static int kvmppc_h_pr_logical_ci_load(struct kvm_vcpu *vcpu)
 263 {
 264         long rc;
 265
 266         rc = kvmppc_h_logical_ci_load(vcpu);
 267         if (rc == H_TOO_HARD)
 268                 return EMULATE_FAIL;
 269         kvmppc_set_gpr(vcpu, 3, rc);
 270         return EMULATE_DONE;
 271 }
 272
 273 static int kvmppc_h_pr_logical_ci_store(struct kvm_vcpu *vcpu)
 274 {
 275         long rc;
 276
 277         rc = kvmppc_h_logical_ci_store(vcpu);
 278         if (rc == H_TOO_HARD)
 279                 return EMULATE_FAIL;
 280         kvmppc_set_gpr(vcpu, 3, rc);
 281         return EMULATE_DONE;
 282 }
 283
 284 #ifdef CONFIG_SPAPR_TCE_IOMMU
 285 static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu)
 286 {
 287         unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
 288         unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
 289         unsigned long tce = kvmppc_get_gpr(vcpu, 6);
 290         long rc;
 291
 292         rc = kvmppc_h_put_tce(vcpu, liobn, ioba, tce);
 293         if (rc == H_TOO_HARD)
 294                 return EMULATE_FAIL;
 295         kvmppc_set_gpr(vcpu, 3, rc);
 296         return EMULATE_DONE;
 297 }
 298
 299 static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu)
 300 {
 301         unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
 302         unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
 303         unsigned long tce = kvmppc_get_gpr(vcpu, 6);
 304         unsigned long npages = kvmppc_get_gpr(vcpu, 7);
 305         long rc;
 306
 307         rc = kvmppc_h_put_tce_indirect(vcpu, liobn, ioba,
 308                         tce, npages);
 309         if (rc == H_TOO_HARD)
 310                 return EMULATE_FAIL;
 311         kvmppc_set_gpr(vcpu, 3, rc);
 312         return EMULATE_DONE;
 313 }
 314
 315 static int kvmppc_h_pr_stuff_tce(struct kvm_vcpu *vcpu)
 316 {
 317         unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
 318         unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
 319         unsigned long tce_value = kvmppc_get_gpr(vcpu, 6);
 320         unsigned long npages = kvmppc_get_gpr(vcpu, 7);
 321         long rc;
 322
 323         rc = kvmppc_h_stuff_tce(vcpu, liobn, ioba, tce_value, npages);
 324         if (rc == H_TOO_HARD)
 325                 return EMULATE_FAIL;
 326         kvmppc_set_gpr(vcpu, 3, rc);
 327         return EMULATE_DONE;
 328 }
 329
 330 #else /* CONFIG_SPAPR_TCE_IOMMU */
 331 static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu)
 332 {
 333         return EMULATE_FAIL;
 334 }
 335
 336 static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu)
 337 {
 338         return EMULATE_FAIL;
 339 }
 340
 341 static int kvmppc_h_pr_stuff_tce(struct kvm_vcpu *vcpu)
 342 {
 343         return EMULATE_FAIL;
 344 }
 345 #endif /* CONFIG_SPAPR_TCE_IOMMU */
 346
 347 static int kvmppc_h_pr_xics_hcall(struct kvm_vcpu *vcpu, u32 cmd)
 348 {
 349         long rc = kvmppc_xics_hcall(vcpu, cmd);
 350         kvmppc_set_gpr(vcpu, 3, rc);
 351         return EMULATE_DONE;
 352 }
 353
 354 int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
 355 {
 356         int rc, idx;
 357
 358         if (cmd <= MAX_HCALL_OPCODE &&
 359             !test_bit(cmd/4, vcpu->kvm->arch.enabled_hcalls))
 360                 return EMULATE_FAIL;
 361
 362         switch (cmd) {
 363         case H_ENTER:
 364                 return kvmppc_h_pr_enter(vcpu);
 365         case H_REMOVE:
 366                 return kvmppc_h_pr_remove(vcpu);
 367         case H_PROTECT:
 368                 return kvmppc_h_pr_protect(vcpu);
 369         case H_BULK_REMOVE:
 370                 return kvmppc_h_pr_bulk_remove(vcpu);
 371         case H_PUT_TCE:
 372                 return kvmppc_h_pr_put_tce(vcpu);
 373         case H_PUT_TCE_INDIRECT:
 374                 return kvmppc_h_pr_put_tce_indirect(vcpu);
 375         case H_STUFF_TCE:
 376                 return kvmppc_h_pr_stuff_tce(vcpu);
 377         case H_CEDE:
 378                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
 379                 kvm_vcpu_block(vcpu);
 380                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
 381                 vcpu->stat.halt_wakeup++;
 382                 return EMULATE_DONE;
 383         case H_LOGICAL_CI_LOAD:
 384                 return kvmppc_h_pr_logical_ci_load(vcpu);
 385         case H_LOGICAL_CI_STORE:
 386                 return kvmppc_h_pr_logical_ci_store(vcpu);
 387         case H_XIRR:
 388         case H_CPPR:
 389         case H_EOI:
 390         case H_IPI:
 391         case H_IPOLL:
 392         case H_XIRR_X:
 393                 if (kvmppc_xics_enabled(vcpu))
 394                         return kvmppc_h_pr_xics_hcall(vcpu, cmd);
 395                 break;
 396         case H_RTAS:
 397                 if (list_empty(&vcpu->kvm->arch.rtas_tokens))
 398                         break;
 399                 idx = srcu_read_lock(&vcpu->kvm->srcu);
 400                 rc = kvmppc_rtas_hcall(vcpu);
 401                 srcu_read_unlock(&vcpu->kvm->srcu, idx);
 402                 if (rc)
 403                         break;
 404                 kvmppc_set_gpr(vcpu, 3, 0);
 405                 return EMULATE_DONE;
 406         }
 407
 408         return EMULATE_FAIL;
 409 }
 410
 411 int kvmppc_hcall_impl_pr(unsigned long cmd)
 412 {
 413         switch (cmd) {
 414         case H_ENTER:
 415         case H_REMOVE:
 416         case H_PROTECT:
 417         case H_BULK_REMOVE:
 418         case H_PUT_TCE:
 419         case H_PUT_TCE_INDIRECT:
 420         case H_STUFF_TCE:
 421         case H_CEDE:
 422         case H_LOGICAL_CI_LOAD:
 423         case H_LOGICAL_CI_STORE:
 424 #ifdef CONFIG_KVM_XICS
 425         case H_XIRR:
 426         case H_CPPR:
 427         case H_EOI:
 428         case H_IPI:
 429         case H_IPOLL:
 430         case H_XIRR_X:
 431 #endif
 432                 return 1;
 433         }
 434         return 0;
 435 }
 436
 437 /*
 438  * List of hcall numbers to enable by default.
 439  * For compatibility with old userspace, we enable by default
 440  * all hcalls that were implemented before the hcall-enabling
 441  * facility was added.  Note this list should not include H_RTAS.
 442  */
 443 static unsigned int default_hcall_list[] = {
 444         H_ENTER,
 445         H_REMOVE,
 446         H_PROTECT,
 447         H_BULK_REMOVE,
 448         H_PUT_TCE,
 449         H_CEDE,
 450 #ifdef CONFIG_KVM_XICS
 451         H_XIRR,
 452         H_CPPR,
 453         H_EOI,
 454         H_IPI,
 455         H_IPOLL,
 456         H_XIRR_X,
 457 #endif
 458         0
 459 };
 460
 461 void kvmppc_pr_init_default_hcalls(struct kvm *kvm)
 462 {
 463         int i;
 464         unsigned int hcall;
 465
 466         for (i = 0; default_hcall_list[i]; ++i) {
 467                 hcall = default_hcall_list[i];
 468                 WARN_ON(!kvmppc_hcall_impl_pr(hcall));
 469                 __set_bit(hcall / 4, kvm->arch.enabled_hcalls);
 470         }
 471 }