1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corporation, 2018 4 * Authors Suraj Jitindar Singh <sjitindarsingh@gmail.com> 5 * Paul Mackerras <paulus@ozlabs.org> 6 * 7 * Description: KVM functions specific to running nested KVM-HV guests 8 * on Book3S processors (specifically POWER9 and later). 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/kvm_host.h> 13 #include <linux/llist.h> 14 #include <linux/pgtable.h> 15 16 #include <asm/kvm_ppc.h> 17 #include <asm/kvm_book3s.h> 18 #include <asm/mmu.h> 19 #include <asm/pgalloc.h> 20 #include <asm/pte-walk.h> 21 #include <asm/reg.h> 22 #include <asm/plpar_wrappers.h> 23 24 static struct patb_entry *pseries_partition_tb; 25 26 static void kvmhv_update_ptbl_cache(struct kvm_nested_guest *gp); 27 static void kvmhv_free_memslot_nest_rmap(struct kvm_memory_slot *free); 28 29 void kvmhv_save_hv_regs(struct kvm_vcpu *vcpu, struct hv_guest_state *hr) 30 { 31 struct kvmppc_vcore *vc = vcpu->arch.vcore; 32 33 hr->pcr = vc->pcr | PCR_MASK; 34 hr->dpdes = vc->dpdes; 35 hr->hfscr = vcpu->arch.hfscr; 36 hr->tb_offset = vc->tb_offset; 37 hr->dawr0 = vcpu->arch.dawr0; 38 hr->dawrx0 = vcpu->arch.dawrx0; 39 hr->ciabr = vcpu->arch.ciabr; 40 hr->purr = vcpu->arch.purr; 41 hr->spurr = vcpu->arch.spurr; 42 hr->ic = vcpu->arch.ic; 43 hr->vtb = vc->vtb; 44 hr->srr0 = vcpu->arch.shregs.srr0; 45 hr->srr1 = vcpu->arch.shregs.srr1; 46 hr->sprg[0] = vcpu->arch.shregs.sprg0; 47 hr->sprg[1] = vcpu->arch.shregs.sprg1; 48 hr->sprg[2] = vcpu->arch.shregs.sprg2; 49 hr->sprg[3] = vcpu->arch.shregs.sprg3; 50 hr->pidr = vcpu->arch.pid; 51 hr->cfar = vcpu->arch.cfar; 52 hr->ppr = vcpu->arch.ppr; 53 hr->dawr1 = vcpu->arch.dawr1; 54 hr->dawrx1 = vcpu->arch.dawrx1; 55 } 56 57 /* Use noinline_for_stack due to https://bugs.llvm.org/show_bug.cgi?id=49610 */ 58 static noinline_for_stack void byteswap_pt_regs(struct pt_regs *regs) 59 { 60 unsigned long *addr = (unsigned long *) regs; 61 62 for (; addr < ((unsigned long *) (regs + 1)); addr++) 63 *addr = swab64(*addr); 64 } 65 66 static void byteswap_hv_regs(struct hv_guest_state *hr) 67 { 68 hr->version = swab64(hr->version); 69 hr->lpid = swab32(hr->lpid); 70 hr->vcpu_token = swab32(hr->vcpu_token); 71 hr->lpcr = swab64(hr->lpcr); 72 hr->pcr = swab64(hr->pcr) | PCR_MASK; 73 hr->amor = swab64(hr->amor); 74 hr->dpdes = swab64(hr->dpdes); 75 hr->hfscr = swab64(hr->hfscr); 76 hr->tb_offset = swab64(hr->tb_offset); 77 hr->dawr0 = swab64(hr->dawr0); 78 hr->dawrx0 = swab64(hr->dawrx0); 79 hr->ciabr = swab64(hr->ciabr); 80 hr->hdec_expiry = swab64(hr->hdec_expiry); 81 hr->purr = swab64(hr->purr); 82 hr->spurr = swab64(hr->spurr); 83 hr->ic = swab64(hr->ic); 84 hr->vtb = swab64(hr->vtb); 85 hr->hdar = swab64(hr->hdar); 86 hr->hdsisr = swab64(hr->hdsisr); 87 hr->heir = swab64(hr->heir); 88 hr->asdr = swab64(hr->asdr); 89 hr->srr0 = swab64(hr->srr0); 90 hr->srr1 = swab64(hr->srr1); 91 hr->sprg[0] = swab64(hr->sprg[0]); 92 hr->sprg[1] = swab64(hr->sprg[1]); 93 hr->sprg[2] = swab64(hr->sprg[2]); 94 hr->sprg[3] = swab64(hr->sprg[3]); 95 hr->pidr = swab64(hr->pidr); 96 hr->cfar = swab64(hr->cfar); 97 hr->ppr = swab64(hr->ppr); 98 hr->dawr1 = swab64(hr->dawr1); 99 hr->dawrx1 = swab64(hr->dawrx1); 100 } 101 102 static void save_hv_return_state(struct kvm_vcpu *vcpu, 103 struct hv_guest_state *hr) 104 { 105 struct kvmppc_vcore *vc = vcpu->arch.vcore; 106 107 hr->dpdes = vc->dpdes; 108 hr->purr = vcpu->arch.purr; 109 hr->spurr = vcpu->arch.spurr; 110 hr->ic = vcpu->arch.ic; 111 hr->vtb = vc->vtb; 112 hr->srr0 = vcpu->arch.shregs.srr0; 113 hr->srr1 = vcpu->arch.shregs.srr1; 114 hr->sprg[0] = vcpu->arch.shregs.sprg0; 115 hr->sprg[1] = vcpu->arch.shregs.sprg1; 116 hr->sprg[2] = vcpu->arch.shregs.sprg2; 117 hr->sprg[3] = vcpu->arch.shregs.sprg3; 118 hr->pidr = vcpu->arch.pid; 119 hr->cfar = vcpu->arch.cfar; 120 hr->ppr = vcpu->arch.ppr; 121 switch (vcpu->arch.trap) { 122 case BOOK3S_INTERRUPT_H_DATA_STORAGE: 123 hr->hdar = vcpu->arch.fault_dar; 124 hr->hdsisr = vcpu->arch.fault_dsisr; 125 hr->asdr = vcpu->arch.fault_gpa; 126 break; 127 case BOOK3S_INTERRUPT_H_INST_STORAGE: 128 hr->asdr = vcpu->arch.fault_gpa; 129 break; 130 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: 131 hr->hfscr = ((~HFSCR_INTR_CAUSE & hr->hfscr) | 132 (HFSCR_INTR_CAUSE & vcpu->arch.hfscr)); 133 break; 134 case BOOK3S_INTERRUPT_H_EMUL_ASSIST: 135 hr->heir = vcpu->arch.emul_inst; 136 break; 137 } 138 } 139 140 static void restore_hv_regs(struct kvm_vcpu *vcpu, const struct hv_guest_state *hr) 141 { 142 struct kvmppc_vcore *vc = vcpu->arch.vcore; 143 144 vc->pcr = hr->pcr | PCR_MASK; 145 vc->dpdes = hr->dpdes; 146 vcpu->arch.hfscr = hr->hfscr; 147 vcpu->arch.dawr0 = hr->dawr0; 148 vcpu->arch.dawrx0 = hr->dawrx0; 149 vcpu->arch.ciabr = hr->ciabr; 150 vcpu->arch.purr = hr->purr; 151 vcpu->arch.spurr = hr->spurr; 152 vcpu->arch.ic = hr->ic; 153 vc->vtb = hr->vtb; 154 vcpu->arch.shregs.srr0 = hr->srr0; 155 vcpu->arch.shregs.srr1 = hr->srr1; 156 vcpu->arch.shregs.sprg0 = hr->sprg[0]; 157 vcpu->arch.shregs.sprg1 = hr->sprg[1]; 158 vcpu->arch.shregs.sprg2 = hr->sprg[2]; 159 vcpu->arch.shregs.sprg3 = hr->sprg[3]; 160 vcpu->arch.pid = hr->pidr; 161 vcpu->arch.cfar = hr->cfar; 162 vcpu->arch.ppr = hr->ppr; 163 vcpu->arch.dawr1 = hr->dawr1; 164 vcpu->arch.dawrx1 = hr->dawrx1; 165 } 166 167 void kvmhv_restore_hv_return_state(struct kvm_vcpu *vcpu, 168 struct hv_guest_state *hr) 169 { 170 struct kvmppc_vcore *vc = vcpu->arch.vcore; 171 172 vc->dpdes = hr->dpdes; 173 vcpu->arch.hfscr = hr->hfscr; 174 vcpu->arch.purr = hr->purr; 175 vcpu->arch.spurr = hr->spurr; 176 vcpu->arch.ic = hr->ic; 177 vc->vtb = hr->vtb; 178 vcpu->arch.fault_dar = hr->hdar; 179 vcpu->arch.fault_dsisr = hr->hdsisr; 180 vcpu->arch.fault_gpa = hr->asdr; 181 vcpu->arch.emul_inst = hr->heir; 182 vcpu->arch.shregs.srr0 = hr->srr0; 183 vcpu->arch.shregs.srr1 = hr->srr1; 184 vcpu->arch.shregs.sprg0 = hr->sprg[0]; 185 vcpu->arch.shregs.sprg1 = hr->sprg[1]; 186 vcpu->arch.shregs.sprg2 = hr->sprg[2]; 187 vcpu->arch.shregs.sprg3 = hr->sprg[3]; 188 vcpu->arch.pid = hr->pidr; 189 vcpu->arch.cfar = hr->cfar; 190 vcpu->arch.ppr = hr->ppr; 191 } 192 193 static void kvmhv_nested_mmio_needed(struct kvm_vcpu *vcpu, u64 regs_ptr) 194 { 195 /* No need to reflect the page fault to L1, we've handled it */ 196 vcpu->arch.trap = 0; 197 198 /* 199 * Since the L2 gprs have already been written back into L1 memory when 200 * we complete the mmio, store the L1 memory location of the L2 gpr 201 * being loaded into by the mmio so that the loaded value can be 202 * written there in kvmppc_complete_mmio_load() 203 */ 204 if (((vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) == KVM_MMIO_REG_GPR) 205 && (vcpu->mmio_is_write == 0)) { 206 vcpu->arch.nested_io_gpr = (gpa_t) regs_ptr + 207 offsetof(struct pt_regs, 208 gpr[vcpu->arch.io_gpr]); 209 vcpu->arch.io_gpr = KVM_MMIO_REG_NESTED_GPR; 210 } 211 } 212 213 static int kvmhv_read_guest_state_and_regs(struct kvm_vcpu *vcpu, 214 struct hv_guest_state *l2_hv, 215 struct pt_regs *l2_regs, 216 u64 hv_ptr, u64 regs_ptr) 217 { 218 int size; 219 220 if (kvm_vcpu_read_guest(vcpu, hv_ptr, &l2_hv->version, 221 sizeof(l2_hv->version))) 222 return -1; 223 224 if (kvmppc_need_byteswap(vcpu)) 225 l2_hv->version = swab64(l2_hv->version); 226 227 size = hv_guest_state_size(l2_hv->version); 228 if (size < 0) 229 return -1; 230 231 return kvm_vcpu_read_guest(vcpu, hv_ptr, l2_hv, size) || 232 kvm_vcpu_read_guest(vcpu, regs_ptr, l2_regs, 233 sizeof(struct pt_regs)); 234 } 235 236 static int kvmhv_write_guest_state_and_regs(struct kvm_vcpu *vcpu, 237 struct hv_guest_state *l2_hv, 238 struct pt_regs *l2_regs, 239 u64 hv_ptr, u64 regs_ptr) 240 { 241 int size; 242 243 size = hv_guest_state_size(l2_hv->version); 244 if (size < 0) 245 return -1; 246 247 return kvm_vcpu_write_guest(vcpu, hv_ptr, l2_hv, size) || 248 kvm_vcpu_write_guest(vcpu, regs_ptr, l2_regs, 249 sizeof(struct pt_regs)); 250 } 251 252 static void load_l2_hv_regs(struct kvm_vcpu *vcpu, 253 const struct hv_guest_state *l2_hv, 254 const struct hv_guest_state *l1_hv, u64 *lpcr) 255 { 256 struct kvmppc_vcore *vc = vcpu->arch.vcore; 257 u64 mask; 258 259 restore_hv_regs(vcpu, l2_hv); 260 261 /* 262 * Don't let L1 change LPCR bits for the L2 except these: 263 */ 264 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD | 265 LPCR_LPES | LPCR_MER; 266 267 /* 268 * Additional filtering is required depending on hardware 269 * and configuration. 270 */ 271 *lpcr = kvmppc_filter_lpcr_hv(vcpu->kvm, 272 (vc->lpcr & ~mask) | (*lpcr & mask)); 273 274 /* 275 * Don't let L1 enable features for L2 which we don't allow for L1, 276 * but preserve the interrupt cause field. 277 */ 278 vcpu->arch.hfscr = l2_hv->hfscr & (HFSCR_INTR_CAUSE | vcpu->arch.hfscr_permitted); 279 280 /* Don't let data address watchpoint match in hypervisor state */ 281 vcpu->arch.dawrx0 = l2_hv->dawrx0 & ~DAWRX_HYP; 282 vcpu->arch.dawrx1 = l2_hv->dawrx1 & ~DAWRX_HYP; 283 284 /* Don't let completed instruction address breakpt match in HV state */ 285 if ((l2_hv->ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) 286 vcpu->arch.ciabr = l2_hv->ciabr & ~CIABR_PRIV; 287 } 288 289 long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu) 290 { 291 long int err, r; 292 struct kvm_nested_guest *l2; 293 struct pt_regs l2_regs, saved_l1_regs; 294 struct hv_guest_state l2_hv = {0}, saved_l1_hv; 295 struct kvmppc_vcore *vc = vcpu->arch.vcore; 296 u64 hv_ptr, regs_ptr; 297 u64 hdec_exp, lpcr; 298 s64 delta_purr, delta_spurr, delta_ic, delta_vtb; 299 300 if (vcpu->kvm->arch.l1_ptcr == 0) 301 return H_NOT_AVAILABLE; 302 303 if (MSR_TM_TRANSACTIONAL(vcpu->arch.shregs.msr)) 304 return H_BAD_MODE; 305 306 /* copy parameters in */ 307 hv_ptr = kvmppc_get_gpr(vcpu, 4); 308 regs_ptr = kvmppc_get_gpr(vcpu, 5); 309 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 310 err = kvmhv_read_guest_state_and_regs(vcpu, &l2_hv, &l2_regs, 311 hv_ptr, regs_ptr); 312 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 313 if (err) 314 return H_PARAMETER; 315 316 if (kvmppc_need_byteswap(vcpu)) 317 byteswap_hv_regs(&l2_hv); 318 if (l2_hv.version > HV_GUEST_STATE_VERSION) 319 return H_P2; 320 321 if (kvmppc_need_byteswap(vcpu)) 322 byteswap_pt_regs(&l2_regs); 323 if (l2_hv.vcpu_token >= NR_CPUS) 324 return H_PARAMETER; 325 326 /* 327 * L1 must have set up a suspended state to enter the L2 in a 328 * transactional state, and only in that case. These have to be 329 * filtered out here to prevent causing a TM Bad Thing in the 330 * host HRFID. We could synthesize a TM Bad Thing back to the L1 331 * here but there doesn't seem like much point. 332 */ 333 if (MSR_TM_SUSPENDED(vcpu->arch.shregs.msr)) { 334 if (!MSR_TM_ACTIVE(l2_regs.msr)) 335 return H_BAD_MODE; 336 } else { 337 if (l2_regs.msr & MSR_TS_MASK) 338 return H_BAD_MODE; 339 if (WARN_ON_ONCE(vcpu->arch.shregs.msr & MSR_TS_MASK)) 340 return H_BAD_MODE; 341 } 342 343 /* translate lpid */ 344 l2 = kvmhv_get_nested(vcpu->kvm, l2_hv.lpid, true); 345 if (!l2) 346 return H_PARAMETER; 347 if (!l2->l1_gr_to_hr) { 348 mutex_lock(&l2->tlb_lock); 349 kvmhv_update_ptbl_cache(l2); 350 mutex_unlock(&l2->tlb_lock); 351 } 352 353 /* save l1 values of things */ 354 vcpu->arch.regs.msr = vcpu->arch.shregs.msr; 355 saved_l1_regs = vcpu->arch.regs; 356 kvmhv_save_hv_regs(vcpu, &saved_l1_hv); 357 358 /* convert TB values/offsets to host (L0) values */ 359 hdec_exp = l2_hv.hdec_expiry - vc->tb_offset; 360 vc->tb_offset += l2_hv.tb_offset; 361 362 /* set L1 state to L2 state */ 363 vcpu->arch.nested = l2; 364 vcpu->arch.nested_vcpu_id = l2_hv.vcpu_token; 365 l2->hfscr = l2_hv.hfscr; 366 vcpu->arch.regs = l2_regs; 367 368 /* Guest must always run with ME enabled, HV disabled. */ 369 vcpu->arch.shregs.msr = (vcpu->arch.regs.msr | MSR_ME) & ~MSR_HV; 370 371 lpcr = l2_hv.lpcr; 372 load_l2_hv_regs(vcpu, &l2_hv, &saved_l1_hv, &lpcr); 373 374 vcpu->arch.ret = RESUME_GUEST; 375 vcpu->arch.trap = 0; 376 do { 377 if (mftb() >= hdec_exp) { 378 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; 379 r = RESUME_HOST; 380 break; 381 } 382 r = kvmhv_run_single_vcpu(vcpu, hdec_exp, lpcr); 383 } while (is_kvmppc_resume_guest(r)); 384 385 /* save L2 state for return */ 386 l2_regs = vcpu->arch.regs; 387 l2_regs.msr = vcpu->arch.shregs.msr; 388 delta_purr = vcpu->arch.purr - l2_hv.purr; 389 delta_spurr = vcpu->arch.spurr - l2_hv.spurr; 390 delta_ic = vcpu->arch.ic - l2_hv.ic; 391 delta_vtb = vc->vtb - l2_hv.vtb; 392 save_hv_return_state(vcpu, &l2_hv); 393 394 /* restore L1 state */ 395 vcpu->arch.nested = NULL; 396 vcpu->arch.regs = saved_l1_regs; 397 vcpu->arch.shregs.msr = saved_l1_regs.msr & ~MSR_TS_MASK; 398 /* set L1 MSR TS field according to L2 transaction state */ 399 if (l2_regs.msr & MSR_TS_MASK) 400 vcpu->arch.shregs.msr |= MSR_TS_S; 401 vc->tb_offset = saved_l1_hv.tb_offset; 402 restore_hv_regs(vcpu, &saved_l1_hv); 403 vcpu->arch.purr += delta_purr; 404 vcpu->arch.spurr += delta_spurr; 405 vcpu->arch.ic += delta_ic; 406 vc->vtb += delta_vtb; 407 408 kvmhv_put_nested(l2); 409 410 /* copy l2_hv_state and regs back to guest */ 411 if (kvmppc_need_byteswap(vcpu)) { 412 byteswap_hv_regs(&l2_hv); 413 byteswap_pt_regs(&l2_regs); 414 } 415 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 416 err = kvmhv_write_guest_state_and_regs(vcpu, &l2_hv, &l2_regs, 417 hv_ptr, regs_ptr); 418 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 419 if (err) 420 return H_AUTHORITY; 421 422 if (r == -EINTR) 423 return H_INTERRUPT; 424 425 if (vcpu->mmio_needed) { 426 kvmhv_nested_mmio_needed(vcpu, regs_ptr); 427 return H_TOO_HARD; 428 } 429 430 return vcpu->arch.trap; 431 } 432 433 long kvmhv_nested_init(void) 434 { 435 long int ptb_order; 436 unsigned long ptcr; 437 long rc; 438 439 if (!kvmhv_on_pseries()) 440 return 0; 441 if (!radix_enabled()) 442 return -ENODEV; 443 444 /* find log base 2 of KVMPPC_NR_LPIDS, rounding up */ 445 ptb_order = __ilog2(KVMPPC_NR_LPIDS - 1) + 1; 446 if (ptb_order < 8) 447 ptb_order = 8; 448 pseries_partition_tb = kmalloc(sizeof(struct patb_entry) << ptb_order, 449 GFP_KERNEL); 450 if (!pseries_partition_tb) { 451 pr_err("kvm-hv: failed to allocated nested partition table\n"); 452 return -ENOMEM; 453 } 454 455 ptcr = __pa(pseries_partition_tb) | (ptb_order - 8); 456 rc = plpar_hcall_norets(H_SET_PARTITION_TABLE, ptcr); 457 if (rc != H_SUCCESS) { 458 pr_err("kvm-hv: Parent hypervisor does not support nesting (rc=%ld)\n", 459 rc); 460 kfree(pseries_partition_tb); 461 pseries_partition_tb = NULL; 462 return -ENODEV; 463 } 464 465 return 0; 466 } 467 468 void kvmhv_nested_exit(void) 469 { 470 /* 471 * N.B. the kvmhv_on_pseries() test is there because it enables 472 * the compiler to remove the call to plpar_hcall_norets() 473 * when CONFIG_PPC_PSERIES=n. 474 */ 475 if (kvmhv_on_pseries() && pseries_partition_tb) { 476 plpar_hcall_norets(H_SET_PARTITION_TABLE, 0); 477 kfree(pseries_partition_tb); 478 pseries_partition_tb = NULL; 479 } 480 } 481 482 static void kvmhv_flush_lpid(unsigned int lpid) 483 { 484 long rc; 485 486 if (!kvmhv_on_pseries()) { 487 radix__flush_all_lpid(lpid); 488 return; 489 } 490 491 if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE)) 492 rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(2, 0, 1), 493 lpid, TLBIEL_INVAL_SET_LPID); 494 else 495 rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU, 496 H_RPTI_TYPE_NESTED | 497 H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC | 498 H_RPTI_TYPE_PAT, 499 H_RPTI_PAGE_ALL, 0, -1UL); 500 if (rc) 501 pr_err("KVM: TLB LPID invalidation hcall failed, rc=%ld\n", rc); 502 } 503 504 void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1) 505 { 506 if (!kvmhv_on_pseries()) { 507 mmu_partition_table_set_entry(lpid, dw0, dw1, true); 508 return; 509 } 510 511 pseries_partition_tb[lpid].patb0 = cpu_to_be64(dw0); 512 pseries_partition_tb[lpid].patb1 = cpu_to_be64(dw1); 513 /* L0 will do the necessary barriers */ 514 kvmhv_flush_lpid(lpid); 515 } 516 517 static void kvmhv_set_nested_ptbl(struct kvm_nested_guest *gp) 518 { 519 unsigned long dw0; 520 521 dw0 = PATB_HR | radix__get_tree_size() | 522 __pa(gp->shadow_pgtable) | RADIX_PGD_INDEX_SIZE; 523 kvmhv_set_ptbl_entry(gp->shadow_lpid, dw0, gp->process_table); 524 } 525 526 void kvmhv_vm_nested_init(struct kvm *kvm) 527 { 528 kvm->arch.max_nested_lpid = -1; 529 } 530 531 /* 532 * Handle the H_SET_PARTITION_TABLE hcall. 533 * r4 = guest real address of partition table + log_2(size) - 12 534 * (formatted as for the PTCR). 535 */ 536 long kvmhv_set_partition_table(struct kvm_vcpu *vcpu) 537 { 538 struct kvm *kvm = vcpu->kvm; 539 unsigned long ptcr = kvmppc_get_gpr(vcpu, 4); 540 int srcu_idx; 541 long ret = H_SUCCESS; 542 543 srcu_idx = srcu_read_lock(&kvm->srcu); 544 /* 545 * Limit the partition table to 4096 entries (because that's what 546 * hardware supports), and check the base address. 547 */ 548 if ((ptcr & PRTS_MASK) > 12 - 8 || 549 !kvm_is_visible_gfn(vcpu->kvm, (ptcr & PRTB_MASK) >> PAGE_SHIFT)) 550 ret = H_PARAMETER; 551 srcu_read_unlock(&kvm->srcu, srcu_idx); 552 if (ret == H_SUCCESS) 553 kvm->arch.l1_ptcr = ptcr; 554 return ret; 555 } 556 557 /* 558 * Handle the H_COPY_TOFROM_GUEST hcall. 559 * r4 = L1 lpid of nested guest 560 * r5 = pid 561 * r6 = eaddr to access 562 * r7 = to buffer (L1 gpa) 563 * r8 = from buffer (L1 gpa) 564 * r9 = n bytes to copy 565 */ 566 long kvmhv_copy_tofrom_guest_nested(struct kvm_vcpu *vcpu) 567 { 568 struct kvm_nested_guest *gp; 569 int l1_lpid = kvmppc_get_gpr(vcpu, 4); 570 int pid = kvmppc_get_gpr(vcpu, 5); 571 gva_t eaddr = kvmppc_get_gpr(vcpu, 6); 572 gpa_t gp_to = (gpa_t) kvmppc_get_gpr(vcpu, 7); 573 gpa_t gp_from = (gpa_t) kvmppc_get_gpr(vcpu, 8); 574 void *buf; 575 unsigned long n = kvmppc_get_gpr(vcpu, 9); 576 bool is_load = !!gp_to; 577 long rc; 578 579 if (gp_to && gp_from) /* One must be NULL to determine the direction */ 580 return H_PARAMETER; 581 582 if (eaddr & (0xFFFUL << 52)) 583 return H_PARAMETER; 584 585 buf = kzalloc(n, GFP_KERNEL); 586 if (!buf) 587 return H_NO_MEM; 588 589 gp = kvmhv_get_nested(vcpu->kvm, l1_lpid, false); 590 if (!gp) { 591 rc = H_PARAMETER; 592 goto out_free; 593 } 594 595 mutex_lock(&gp->tlb_lock); 596 597 if (is_load) { 598 /* Load from the nested guest into our buffer */ 599 rc = __kvmhv_copy_tofrom_guest_radix(gp->shadow_lpid, pid, 600 eaddr, buf, NULL, n); 601 if (rc) 602 goto not_found; 603 604 /* Write what was loaded into our buffer back to the L1 guest */ 605 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 606 rc = kvm_vcpu_write_guest(vcpu, gp_to, buf, n); 607 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 608 if (rc) 609 goto not_found; 610 } else { 611 /* Load the data to be stored from the L1 guest into our buf */ 612 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 613 rc = kvm_vcpu_read_guest(vcpu, gp_from, buf, n); 614 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); 615 if (rc) 616 goto not_found; 617 618 /* Store from our buffer into the nested guest */ 619 rc = __kvmhv_copy_tofrom_guest_radix(gp->shadow_lpid, pid, 620 eaddr, NULL, buf, n); 621 if (rc) 622 goto not_found; 623 } 624 625 out_unlock: 626 mutex_unlock(&gp->tlb_lock); 627 kvmhv_put_nested(gp); 628 out_free: 629 kfree(buf); 630 return rc; 631 not_found: 632 rc = H_NOT_FOUND; 633 goto out_unlock; 634 } 635 636 /* 637 * Reload the partition table entry for a guest. 638 * Caller must hold gp->tlb_lock. 639 */ 640 static void kvmhv_update_ptbl_cache(struct kvm_nested_guest *gp) 641 { 642 int ret; 643 struct patb_entry ptbl_entry; 644 unsigned long ptbl_addr; 645 struct kvm *kvm = gp->l1_host; 646 647 ret = -EFAULT; 648 ptbl_addr = (kvm->arch.l1_ptcr & PRTB_MASK) + (gp->l1_lpid << 4); 649 if (gp->l1_lpid < (1ul << ((kvm->arch.l1_ptcr & PRTS_MASK) + 8))) { 650 int srcu_idx = srcu_read_lock(&kvm->srcu); 651 ret = kvm_read_guest(kvm, ptbl_addr, 652 &ptbl_entry, sizeof(ptbl_entry)); 653 srcu_read_unlock(&kvm->srcu, srcu_idx); 654 } 655 if (ret) { 656 gp->l1_gr_to_hr = 0; 657 gp->process_table = 0; 658 } else { 659 gp->l1_gr_to_hr = be64_to_cpu(ptbl_entry.patb0); 660 gp->process_table = be64_to_cpu(ptbl_entry.patb1); 661 } 662 kvmhv_set_nested_ptbl(gp); 663 } 664 665 static struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm *kvm, unsigned int lpid) 666 { 667 struct kvm_nested_guest *gp; 668 long shadow_lpid; 669 670 gp = kzalloc(sizeof(*gp), GFP_KERNEL); 671 if (!gp) 672 return NULL; 673 gp->l1_host = kvm; 674 gp->l1_lpid = lpid; 675 mutex_init(&gp->tlb_lock); 676 gp->shadow_pgtable = pgd_alloc(kvm->mm); 677 if (!gp->shadow_pgtable) 678 goto out_free; 679 shadow_lpid = kvmppc_alloc_lpid(); 680 if (shadow_lpid < 0) 681 goto out_free2; 682 gp->shadow_lpid = shadow_lpid; 683 gp->radix = 1; 684 685 memset(gp->prev_cpu, -1, sizeof(gp->prev_cpu)); 686 687 return gp; 688 689 out_free2: 690 pgd_free(kvm->mm, gp->shadow_pgtable); 691 out_free: 692 kfree(gp); 693 return NULL; 694 } 695 696 /* 697 * Free up any resources allocated for a nested guest. 698 */ 699 static void kvmhv_release_nested(struct kvm_nested_guest *gp) 700 { 701 struct kvm *kvm = gp->l1_host; 702 703 if (gp->shadow_pgtable) { 704 /* 705 * No vcpu is using this struct and no call to 706 * kvmhv_get_nested can find this struct, 707 * so we don't need to hold kvm->mmu_lock. 708 */ 709 kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, 710 gp->shadow_lpid); 711 pgd_free(kvm->mm, gp->shadow_pgtable); 712 } 713 kvmhv_set_ptbl_entry(gp->shadow_lpid, 0, 0); 714 kvmppc_free_lpid(gp->shadow_lpid); 715 kfree(gp); 716 } 717 718 static void kvmhv_remove_nested(struct kvm_nested_guest *gp) 719 { 720 struct kvm *kvm = gp->l1_host; 721 int lpid = gp->l1_lpid; 722 long ref; 723 724 spin_lock(&kvm->mmu_lock); 725 if (gp == kvm->arch.nested_guests[lpid]) { 726 kvm->arch.nested_guests[lpid] = NULL; 727 if (lpid == kvm->arch.max_nested_lpid) { 728 while (--lpid >= 0 && !kvm->arch.nested_guests[lpid]) 729 ; 730 kvm->arch.max_nested_lpid = lpid; 731 } 732 --gp->refcnt; 733 } 734 ref = gp->refcnt; 735 spin_unlock(&kvm->mmu_lock); 736 if (ref == 0) 737 kvmhv_release_nested(gp); 738 } 739 740 /* 741 * Free up all nested resources allocated for this guest. 742 * This is called with no vcpus of the guest running, when 743 * switching the guest to HPT mode or when destroying the 744 * guest. 745 */ 746 void kvmhv_release_all_nested(struct kvm *kvm) 747 { 748 int i; 749 struct kvm_nested_guest *gp; 750 struct kvm_nested_guest *freelist = NULL; 751 struct kvm_memory_slot *memslot; 752 int srcu_idx; 753 754 spin_lock(&kvm->mmu_lock); 755 for (i = 0; i <= kvm->arch.max_nested_lpid; i++) { 756 gp = kvm->arch.nested_guests[i]; 757 if (!gp) 758 continue; 759 kvm->arch.nested_guests[i] = NULL; 760 if (--gp->refcnt == 0) { 761 gp->next = freelist; 762 freelist = gp; 763 } 764 } 765 kvm->arch.max_nested_lpid = -1; 766 spin_unlock(&kvm->mmu_lock); 767 while ((gp = freelist) != NULL) { 768 freelist = gp->next; 769 kvmhv_release_nested(gp); 770 } 771 772 srcu_idx = srcu_read_lock(&kvm->srcu); 773 kvm_for_each_memslot(memslot, kvm_memslots(kvm)) 774 kvmhv_free_memslot_nest_rmap(memslot); 775 srcu_read_unlock(&kvm->srcu, srcu_idx); 776 } 777 778 /* caller must hold gp->tlb_lock */ 779 static void kvmhv_flush_nested(struct kvm_nested_guest *gp) 780 { 781 struct kvm *kvm = gp->l1_host; 782 783 spin_lock(&kvm->mmu_lock); 784 kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, gp->shadow_lpid); 785 spin_unlock(&kvm->mmu_lock); 786 kvmhv_flush_lpid(gp->shadow_lpid); 787 kvmhv_update_ptbl_cache(gp); 788 if (gp->l1_gr_to_hr == 0) 789 kvmhv_remove_nested(gp); 790 } 791 792 struct kvm_nested_guest *kvmhv_get_nested(struct kvm *kvm, int l1_lpid, 793 bool create) 794 { 795 struct kvm_nested_guest *gp, *newgp; 796 797 if (l1_lpid >= KVM_MAX_NESTED_GUESTS || 798 l1_lpid >= (1ul << ((kvm->arch.l1_ptcr & PRTS_MASK) + 12 - 4))) 799 return NULL; 800 801 spin_lock(&kvm->mmu_lock); 802 gp = kvm->arch.nested_guests[l1_lpid]; 803 if (gp) 804 ++gp->refcnt; 805 spin_unlock(&kvm->mmu_lock); 806 807 if (gp || !create) 808 return gp; 809 810 newgp = kvmhv_alloc_nested(kvm, l1_lpid); 811 if (!newgp) 812 return NULL; 813 spin_lock(&kvm->mmu_lock); 814 if (kvm->arch.nested_guests[l1_lpid]) { 815 /* someone else beat us to it */ 816 gp = kvm->arch.nested_guests[l1_lpid]; 817 } else { 818 kvm->arch.nested_guests[l1_lpid] = newgp; 819 ++newgp->refcnt; 820 gp = newgp; 821 newgp = NULL; 822 if (l1_lpid > kvm->arch.max_nested_lpid) 823 kvm->arch.max_nested_lpid = l1_lpid; 824 } 825 ++gp->refcnt; 826 spin_unlock(&kvm->mmu_lock); 827 828 if (newgp) 829 kvmhv_release_nested(newgp); 830 831 return gp; 832 } 833 834 void kvmhv_put_nested(struct kvm_nested_guest *gp) 835 { 836 struct kvm *kvm = gp->l1_host; 837 long ref; 838 839 spin_lock(&kvm->mmu_lock); 840 ref = --gp->refcnt; 841 spin_unlock(&kvm->mmu_lock); 842 if (ref == 0) 843 kvmhv_release_nested(gp); 844 } 845 846 static struct kvm_nested_guest *kvmhv_find_nested(struct kvm *kvm, int lpid) 847 { 848 if (lpid > kvm->arch.max_nested_lpid) 849 return NULL; 850 return kvm->arch.nested_guests[lpid]; 851 } 852 853 pte_t *find_kvm_nested_guest_pte(struct kvm *kvm, unsigned long lpid, 854 unsigned long ea, unsigned *hshift) 855 { 856 struct kvm_nested_guest *gp; 857 pte_t *pte; 858 859 gp = kvmhv_find_nested(kvm, lpid); 860 if (!gp) 861 return NULL; 862 863 VM_WARN(!spin_is_locked(&kvm->mmu_lock), 864 "%s called with kvm mmu_lock not held \n", __func__); 865 pte = __find_linux_pte(gp->shadow_pgtable, ea, NULL, hshift); 866 867 return pte; 868 } 869 870 static inline bool kvmhv_n_rmap_is_equal(u64 rmap_1, u64 rmap_2) 871 { 872 return !((rmap_1 ^ rmap_2) & (RMAP_NESTED_LPID_MASK | 873 RMAP_NESTED_GPA_MASK)); 874 } 875 876 void kvmhv_insert_nest_rmap(struct kvm *kvm, unsigned long *rmapp, 877 struct rmap_nested **n_rmap) 878 { 879 struct llist_node *entry = ((struct llist_head *) rmapp)->first; 880 struct rmap_nested *cursor; 881 u64 rmap, new_rmap = (*n_rmap)->rmap; 882 883 /* Are there any existing entries? */ 884 if (!(*rmapp)) { 885 /* No -> use the rmap as a single entry */ 886 *rmapp = new_rmap | RMAP_NESTED_IS_SINGLE_ENTRY; 887 return; 888 } 889 890 /* Do any entries match what we're trying to insert? */ 891 for_each_nest_rmap_safe(cursor, entry, &rmap) { 892 if (kvmhv_n_rmap_is_equal(rmap, new_rmap)) 893 return; 894 } 895 896 /* Do we need to create a list or just add the new entry? */ 897 rmap = *rmapp; 898 if (rmap & RMAP_NESTED_IS_SINGLE_ENTRY) /* Not previously a list */ 899 *rmapp = 0UL; 900 llist_add(&((*n_rmap)->list), (struct llist_head *) rmapp); 901 if (rmap & RMAP_NESTED_IS_SINGLE_ENTRY) /* Not previously a list */ 902 (*n_rmap)->list.next = (struct llist_node *) rmap; 903 904 /* Set NULL so not freed by caller */ 905 *n_rmap = NULL; 906 } 907 908 static void kvmhv_update_nest_rmap_rc(struct kvm *kvm, u64 n_rmap, 909 unsigned long clr, unsigned long set, 910 unsigned long hpa, unsigned long mask) 911 { 912 unsigned long gpa; 913 unsigned int shift, lpid; 914 pte_t *ptep; 915 916 gpa = n_rmap & RMAP_NESTED_GPA_MASK; 917 lpid = (n_rmap & RMAP_NESTED_LPID_MASK) >> RMAP_NESTED_LPID_SHIFT; 918 919 /* Find the pte */ 920 ptep = find_kvm_nested_guest_pte(kvm, lpid, gpa, &shift); 921 /* 922 * If the pte is present and the pfn is still the same, update the pte. 923 * If the pfn has changed then this is a stale rmap entry, the nested 924 * gpa actually points somewhere else now, and there is nothing to do. 925 * XXX A future optimisation would be to remove the rmap entry here. 926 */ 927 if (ptep && pte_present(*ptep) && ((pte_val(*ptep) & mask) == hpa)) { 928 __radix_pte_update(ptep, clr, set); 929 kvmppc_radix_tlbie_page(kvm, gpa, shift, lpid); 930 } 931 } 932 933 /* 934 * For a given list of rmap entries, update the rc bits in all ptes in shadow 935 * page tables for nested guests which are referenced by the rmap list. 936 */ 937 void kvmhv_update_nest_rmap_rc_list(struct kvm *kvm, unsigned long *rmapp, 938 unsigned long clr, unsigned long set, 939 unsigned long hpa, unsigned long nbytes) 940 { 941 struct llist_node *entry = ((struct llist_head *) rmapp)->first; 942 struct rmap_nested *cursor; 943 unsigned long rmap, mask; 944 945 if ((clr | set) & ~(_PAGE_DIRTY | _PAGE_ACCESSED)) 946 return; 947 948 mask = PTE_RPN_MASK & ~(nbytes - 1); 949 hpa &= mask; 950 951 for_each_nest_rmap_safe(cursor, entry, &rmap) 952 kvmhv_update_nest_rmap_rc(kvm, rmap, clr, set, hpa, mask); 953 } 954 955 static void kvmhv_remove_nest_rmap(struct kvm *kvm, u64 n_rmap, 956 unsigned long hpa, unsigned long mask) 957 { 958 struct kvm_nested_guest *gp; 959 unsigned long gpa; 960 unsigned int shift, lpid; 961 pte_t *ptep; 962 963 gpa = n_rmap & RMAP_NESTED_GPA_MASK; 964 lpid = (n_rmap & RMAP_NESTED_LPID_MASK) >> RMAP_NESTED_LPID_SHIFT; 965 gp = kvmhv_find_nested(kvm, lpid); 966 if (!gp) 967 return; 968 969 /* Find and invalidate the pte */ 970 ptep = find_kvm_nested_guest_pte(kvm, lpid, gpa, &shift); 971 /* Don't spuriously invalidate ptes if the pfn has changed */ 972 if (ptep && pte_present(*ptep) && ((pte_val(*ptep) & mask) == hpa)) 973 kvmppc_unmap_pte(kvm, ptep, gpa, shift, NULL, gp->shadow_lpid); 974 } 975 976 static void kvmhv_remove_nest_rmap_list(struct kvm *kvm, unsigned long *rmapp, 977 unsigned long hpa, unsigned long mask) 978 { 979 struct llist_node *entry = llist_del_all((struct llist_head *) rmapp); 980 struct rmap_nested *cursor; 981 unsigned long rmap; 982 983 for_each_nest_rmap_safe(cursor, entry, &rmap) { 984 kvmhv_remove_nest_rmap(kvm, rmap, hpa, mask); 985 kfree(cursor); 986 } 987 } 988 989 /* called with kvm->mmu_lock held */ 990 void kvmhv_remove_nest_rmap_range(struct kvm *kvm, 991 const struct kvm_memory_slot *memslot, 992 unsigned long gpa, unsigned long hpa, 993 unsigned long nbytes) 994 { 995 unsigned long gfn, end_gfn; 996 unsigned long addr_mask; 997 998 if (!memslot) 999 return; 1000 gfn = (gpa >> PAGE_SHIFT) - memslot->base_gfn; 1001 end_gfn = gfn + (nbytes >> PAGE_SHIFT); 1002 1003 addr_mask = PTE_RPN_MASK & ~(nbytes - 1); 1004 hpa &= addr_mask; 1005 1006 for (; gfn < end_gfn; gfn++) { 1007 unsigned long *rmap = &memslot->arch.rmap[gfn]; 1008 kvmhv_remove_nest_rmap_list(kvm, rmap, hpa, addr_mask); 1009 } 1010 } 1011 1012 static void kvmhv_free_memslot_nest_rmap(struct kvm_memory_slot *free) 1013 { 1014 unsigned long page; 1015 1016 for (page = 0; page < free->npages; page++) { 1017 unsigned long rmap, *rmapp = &free->arch.rmap[page]; 1018 struct rmap_nested *cursor; 1019 struct llist_node *entry; 1020 1021 entry = llist_del_all((struct llist_head *) rmapp); 1022 for_each_nest_rmap_safe(cursor, entry, &rmap) 1023 kfree(cursor); 1024 } 1025 } 1026 1027 static bool kvmhv_invalidate_shadow_pte(struct kvm_vcpu *vcpu, 1028 struct kvm_nested_guest *gp, 1029 long gpa, int *shift_ret) 1030 { 1031 struct kvm *kvm = vcpu->kvm; 1032 bool ret = false; 1033 pte_t *ptep; 1034 int shift; 1035 1036 spin_lock(&kvm->mmu_lock); 1037 ptep = find_kvm_nested_guest_pte(kvm, gp->l1_lpid, gpa, &shift); 1038 if (!shift) 1039 shift = PAGE_SHIFT; 1040 if (ptep && pte_present(*ptep)) { 1041 kvmppc_unmap_pte(kvm, ptep, gpa, shift, NULL, gp->shadow_lpid); 1042 ret = true; 1043 } 1044 spin_unlock(&kvm->mmu_lock); 1045 1046 if (shift_ret) 1047 *shift_ret = shift; 1048 return ret; 1049 } 1050 1051 static inline int get_ric(unsigned int instr) 1052 { 1053 return (instr >> 18) & 0x3; 1054 } 1055 1056 static inline int get_prs(unsigned int instr) 1057 { 1058 return (instr >> 17) & 0x1; 1059 } 1060 1061 static inline int get_r(unsigned int instr) 1062 { 1063 return (instr >> 16) & 0x1; 1064 } 1065 1066 static inline int get_lpid(unsigned long r_val) 1067 { 1068 return r_val & 0xffffffff; 1069 } 1070 1071 static inline int get_is(unsigned long r_val) 1072 { 1073 return (r_val >> 10) & 0x3; 1074 } 1075 1076 static inline int get_ap(unsigned long r_val) 1077 { 1078 return (r_val >> 5) & 0x7; 1079 } 1080 1081 static inline long get_epn(unsigned long r_val) 1082 { 1083 return r_val >> 12; 1084 } 1085 1086 static int kvmhv_emulate_tlbie_tlb_addr(struct kvm_vcpu *vcpu, int lpid, 1087 int ap, long epn) 1088 { 1089 struct kvm *kvm = vcpu->kvm; 1090 struct kvm_nested_guest *gp; 1091 long npages; 1092 int shift, shadow_shift; 1093 unsigned long addr; 1094 1095 shift = ap_to_shift(ap); 1096 addr = epn << 12; 1097 if (shift < 0) 1098 /* Invalid ap encoding */ 1099 return -EINVAL; 1100 1101 addr &= ~((1UL << shift) - 1); 1102 npages = 1UL << (shift - PAGE_SHIFT); 1103 1104 gp = kvmhv_get_nested(kvm, lpid, false); 1105 if (!gp) /* No such guest -> nothing to do */ 1106 return 0; 1107 mutex_lock(&gp->tlb_lock); 1108 1109 /* There may be more than one host page backing this single guest pte */ 1110 do { 1111 kvmhv_invalidate_shadow_pte(vcpu, gp, addr, &shadow_shift); 1112 1113 npages -= 1UL << (shadow_shift - PAGE_SHIFT); 1114 addr += 1UL << shadow_shift; 1115 } while (npages > 0); 1116 1117 mutex_unlock(&gp->tlb_lock); 1118 kvmhv_put_nested(gp); 1119 return 0; 1120 } 1121 1122 static void kvmhv_emulate_tlbie_lpid(struct kvm_vcpu *vcpu, 1123 struct kvm_nested_guest *gp, int ric) 1124 { 1125 struct kvm *kvm = vcpu->kvm; 1126 1127 mutex_lock(&gp->tlb_lock); 1128 switch (ric) { 1129 case 0: 1130 /* Invalidate TLB */ 1131 spin_lock(&kvm->mmu_lock); 1132 kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, 1133 gp->shadow_lpid); 1134 kvmhv_flush_lpid(gp->shadow_lpid); 1135 spin_unlock(&kvm->mmu_lock); 1136 break; 1137 case 1: 1138 /* 1139 * Invalidate PWC 1140 * We don't cache this -> nothing to do 1141 */ 1142 break; 1143 case 2: 1144 /* Invalidate TLB, PWC and caching of partition table entries */ 1145 kvmhv_flush_nested(gp); 1146 break; 1147 default: 1148 break; 1149 } 1150 mutex_unlock(&gp->tlb_lock); 1151 } 1152 1153 static void kvmhv_emulate_tlbie_all_lpid(struct kvm_vcpu *vcpu, int ric) 1154 { 1155 struct kvm *kvm = vcpu->kvm; 1156 struct kvm_nested_guest *gp; 1157 int i; 1158 1159 spin_lock(&kvm->mmu_lock); 1160 for (i = 0; i <= kvm->arch.max_nested_lpid; i++) { 1161 gp = kvm->arch.nested_guests[i]; 1162 if (gp) { 1163 spin_unlock(&kvm->mmu_lock); 1164 kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); 1165 spin_lock(&kvm->mmu_lock); 1166 } 1167 } 1168 spin_unlock(&kvm->mmu_lock); 1169 } 1170 1171 static int kvmhv_emulate_priv_tlbie(struct kvm_vcpu *vcpu, unsigned int instr, 1172 unsigned long rsval, unsigned long rbval) 1173 { 1174 struct kvm *kvm = vcpu->kvm; 1175 struct kvm_nested_guest *gp; 1176 int r, ric, prs, is, ap; 1177 int lpid; 1178 long epn; 1179 int ret = 0; 1180 1181 ric = get_ric(instr); 1182 prs = get_prs(instr); 1183 r = get_r(instr); 1184 lpid = get_lpid(rsval); 1185 is = get_is(rbval); 1186 1187 /* 1188 * These cases are invalid and are not handled: 1189 * r != 1 -> Only radix supported 1190 * prs == 1 -> Not HV privileged 1191 * ric == 3 -> No cluster bombs for radix 1192 * is == 1 -> Partition scoped translations not associated with pid 1193 * (!is) && (ric == 1 || ric == 2) -> Not supported by ISA 1194 */ 1195 if ((!r) || (prs) || (ric == 3) || (is == 1) || 1196 ((!is) && (ric == 1 || ric == 2))) 1197 return -EINVAL; 1198 1199 switch (is) { 1200 case 0: 1201 /* 1202 * We know ric == 0 1203 * Invalidate TLB for a given target address 1204 */ 1205 epn = get_epn(rbval); 1206 ap = get_ap(rbval); 1207 ret = kvmhv_emulate_tlbie_tlb_addr(vcpu, lpid, ap, epn); 1208 break; 1209 case 2: 1210 /* Invalidate matching LPID */ 1211 gp = kvmhv_get_nested(kvm, lpid, false); 1212 if (gp) { 1213 kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); 1214 kvmhv_put_nested(gp); 1215 } 1216 break; 1217 case 3: 1218 /* Invalidate ALL LPIDs */ 1219 kvmhv_emulate_tlbie_all_lpid(vcpu, ric); 1220 break; 1221 default: 1222 ret = -EINVAL; 1223 break; 1224 } 1225 1226 return ret; 1227 } 1228 1229 /* 1230 * This handles the H_TLB_INVALIDATE hcall. 1231 * Parameters are (r4) tlbie instruction code, (r5) rS contents, 1232 * (r6) rB contents. 1233 */ 1234 long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu) 1235 { 1236 int ret; 1237 1238 ret = kvmhv_emulate_priv_tlbie(vcpu, kvmppc_get_gpr(vcpu, 4), 1239 kvmppc_get_gpr(vcpu, 5), kvmppc_get_gpr(vcpu, 6)); 1240 if (ret) 1241 return H_PARAMETER; 1242 return H_SUCCESS; 1243 } 1244 1245 static long do_tlb_invalidate_nested_all(struct kvm_vcpu *vcpu, 1246 unsigned long lpid, unsigned long ric) 1247 { 1248 struct kvm *kvm = vcpu->kvm; 1249 struct kvm_nested_guest *gp; 1250 1251 gp = kvmhv_get_nested(kvm, lpid, false); 1252 if (gp) { 1253 kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); 1254 kvmhv_put_nested(gp); 1255 } 1256 return H_SUCCESS; 1257 } 1258 1259 /* 1260 * Number of pages above which we invalidate the entire LPID rather than 1261 * flush individual pages. 1262 */ 1263 static unsigned long tlb_range_flush_page_ceiling __read_mostly = 33; 1264 1265 static long do_tlb_invalidate_nested_tlb(struct kvm_vcpu *vcpu, 1266 unsigned long lpid, 1267 unsigned long pg_sizes, 1268 unsigned long start, 1269 unsigned long end) 1270 { 1271 int ret = H_P4; 1272 unsigned long addr, nr_pages; 1273 struct mmu_psize_def *def; 1274 unsigned long psize, ap, page_size; 1275 bool flush_lpid; 1276 1277 for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { 1278 def = &mmu_psize_defs[psize]; 1279 if (!(pg_sizes & def->h_rpt_pgsize)) 1280 continue; 1281 1282 nr_pages = (end - start) >> def->shift; 1283 flush_lpid = nr_pages > tlb_range_flush_page_ceiling; 1284 if (flush_lpid) 1285 return do_tlb_invalidate_nested_all(vcpu, lpid, 1286 RIC_FLUSH_TLB); 1287 addr = start; 1288 ap = mmu_get_ap(psize); 1289 page_size = 1UL << def->shift; 1290 do { 1291 ret = kvmhv_emulate_tlbie_tlb_addr(vcpu, lpid, ap, 1292 get_epn(addr)); 1293 if (ret) 1294 return H_P4; 1295 addr += page_size; 1296 } while (addr < end); 1297 } 1298 return ret; 1299 } 1300 1301 /* 1302 * Performs partition-scoped invalidations for nested guests 1303 * as part of H_RPT_INVALIDATE hcall. 1304 */ 1305 long do_h_rpt_invalidate_pat(struct kvm_vcpu *vcpu, unsigned long lpid, 1306 unsigned long type, unsigned long pg_sizes, 1307 unsigned long start, unsigned long end) 1308 { 1309 /* 1310 * If L2 lpid isn't valid, we need to return H_PARAMETER. 1311 * 1312 * However, nested KVM issues a L2 lpid flush call when creating 1313 * partition table entries for L2. This happens even before the 1314 * corresponding shadow lpid is created in HV which happens in 1315 * H_ENTER_NESTED call. Since we can't differentiate this case from 1316 * the invalid case, we ignore such flush requests and return success. 1317 */ 1318 if (!kvmhv_find_nested(vcpu->kvm, lpid)) 1319 return H_SUCCESS; 1320 1321 /* 1322 * A flush all request can be handled by a full lpid flush only. 1323 */ 1324 if ((type & H_RPTI_TYPE_NESTED_ALL) == H_RPTI_TYPE_NESTED_ALL) 1325 return do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_ALL); 1326 1327 /* 1328 * We don't need to handle a PWC flush like process table here, 1329 * because intermediate partition scoped table in nested guest doesn't 1330 * really have PWC. Only level we have PWC is in L0 and for nested 1331 * invalidate at L0 we always do kvm_flush_lpid() which does 1332 * radix__flush_all_lpid(). For range invalidate at any level, we 1333 * are not removing the higher level page tables and hence there is 1334 * no PWC invalidate needed. 1335 * 1336 * if (type & H_RPTI_TYPE_PWC) { 1337 * ret = do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_PWC); 1338 * if (ret) 1339 * return H_P4; 1340 * } 1341 */ 1342 1343 if (start == 0 && end == -1) 1344 return do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_TLB); 1345 1346 if (type & H_RPTI_TYPE_TLB) 1347 return do_tlb_invalidate_nested_tlb(vcpu, lpid, pg_sizes, 1348 start, end); 1349 return H_SUCCESS; 1350 } 1351 1352 /* Used to convert a nested guest real address to a L1 guest real address */ 1353 static int kvmhv_translate_addr_nested(struct kvm_vcpu *vcpu, 1354 struct kvm_nested_guest *gp, 1355 unsigned long n_gpa, unsigned long dsisr, 1356 struct kvmppc_pte *gpte_p) 1357 { 1358 u64 fault_addr, flags = dsisr & DSISR_ISSTORE; 1359 int ret; 1360 1361 ret = kvmppc_mmu_walk_radix_tree(vcpu, n_gpa, gpte_p, gp->l1_gr_to_hr, 1362 &fault_addr); 1363 1364 if (ret) { 1365 /* We didn't find a pte */ 1366 if (ret == -EINVAL) { 1367 /* Unsupported mmu config */ 1368 flags |= DSISR_UNSUPP_MMU; 1369 } else if (ret == -ENOENT) { 1370 /* No translation found */ 1371 flags |= DSISR_NOHPTE; 1372 } else if (ret == -EFAULT) { 1373 /* Couldn't access L1 real address */ 1374 flags |= DSISR_PRTABLE_FAULT; 1375 vcpu->arch.fault_gpa = fault_addr; 1376 } else { 1377 /* Unknown error */ 1378 return ret; 1379 } 1380 goto forward_to_l1; 1381 } else { 1382 /* We found a pte -> check permissions */ 1383 if (dsisr & DSISR_ISSTORE) { 1384 /* Can we write? */ 1385 if (!gpte_p->may_write) { 1386 flags |= DSISR_PROTFAULT; 1387 goto forward_to_l1; 1388 } 1389 } else if (vcpu->arch.trap == BOOK3S_INTERRUPT_H_INST_STORAGE) { 1390 /* Can we execute? */ 1391 if (!gpte_p->may_execute) { 1392 flags |= SRR1_ISI_N_G_OR_CIP; 1393 goto forward_to_l1; 1394 } 1395 } else { 1396 /* Can we read? */ 1397 if (!gpte_p->may_read && !gpte_p->may_write) { 1398 flags |= DSISR_PROTFAULT; 1399 goto forward_to_l1; 1400 } 1401 } 1402 } 1403 1404 return 0; 1405 1406 forward_to_l1: 1407 vcpu->arch.fault_dsisr = flags; 1408 if (vcpu->arch.trap == BOOK3S_INTERRUPT_H_INST_STORAGE) { 1409 vcpu->arch.shregs.msr &= SRR1_MSR_BITS; 1410 vcpu->arch.shregs.msr |= flags; 1411 } 1412 return RESUME_HOST; 1413 } 1414 1415 static long kvmhv_handle_nested_set_rc(struct kvm_vcpu *vcpu, 1416 struct kvm_nested_guest *gp, 1417 unsigned long n_gpa, 1418 struct kvmppc_pte gpte, 1419 unsigned long dsisr) 1420 { 1421 struct kvm *kvm = vcpu->kvm; 1422 bool writing = !!(dsisr & DSISR_ISSTORE); 1423 u64 pgflags; 1424 long ret; 1425 1426 /* Are the rc bits set in the L1 partition scoped pte? */ 1427 pgflags = _PAGE_ACCESSED; 1428 if (writing) 1429 pgflags |= _PAGE_DIRTY; 1430 if (pgflags & ~gpte.rc) 1431 return RESUME_HOST; 1432 1433 spin_lock(&kvm->mmu_lock); 1434 /* Set the rc bit in the pte of our (L0) pgtable for the L1 guest */ 1435 ret = kvmppc_hv_handle_set_rc(kvm, false, writing, 1436 gpte.raddr, kvm->arch.lpid); 1437 if (!ret) { 1438 ret = -EINVAL; 1439 goto out_unlock; 1440 } 1441 1442 /* Set the rc bit in the pte of the shadow_pgtable for the nest guest */ 1443 ret = kvmppc_hv_handle_set_rc(kvm, true, writing, 1444 n_gpa, gp->l1_lpid); 1445 if (!ret) 1446 ret = -EINVAL; 1447 else 1448 ret = 0; 1449 1450 out_unlock: 1451 spin_unlock(&kvm->mmu_lock); 1452 return ret; 1453 } 1454 1455 static inline int kvmppc_radix_level_to_shift(int level) 1456 { 1457 switch (level) { 1458 case 2: 1459 return PUD_SHIFT; 1460 case 1: 1461 return PMD_SHIFT; 1462 default: 1463 return PAGE_SHIFT; 1464 } 1465 } 1466 1467 static inline int kvmppc_radix_shift_to_level(int shift) 1468 { 1469 if (shift == PUD_SHIFT) 1470 return 2; 1471 if (shift == PMD_SHIFT) 1472 return 1; 1473 if (shift == PAGE_SHIFT) 1474 return 0; 1475 WARN_ON_ONCE(1); 1476 return 0; 1477 } 1478 1479 /* called with gp->tlb_lock held */ 1480 static long int __kvmhv_nested_page_fault(struct kvm_vcpu *vcpu, 1481 struct kvm_nested_guest *gp) 1482 { 1483 struct kvm *kvm = vcpu->kvm; 1484 struct kvm_memory_slot *memslot; 1485 struct rmap_nested *n_rmap; 1486 struct kvmppc_pte gpte; 1487 pte_t pte, *pte_p; 1488 unsigned long mmu_seq; 1489 unsigned long dsisr = vcpu->arch.fault_dsisr; 1490 unsigned long ea = vcpu->arch.fault_dar; 1491 unsigned long *rmapp; 1492 unsigned long n_gpa, gpa, gfn, perm = 0UL; 1493 unsigned int shift, l1_shift, level; 1494 bool writing = !!(dsisr & DSISR_ISSTORE); 1495 bool kvm_ro = false; 1496 long int ret; 1497 1498 if (!gp->l1_gr_to_hr) { 1499 kvmhv_update_ptbl_cache(gp); 1500 if (!gp->l1_gr_to_hr) 1501 return RESUME_HOST; 1502 } 1503 1504 /* Convert the nested guest real address into a L1 guest real address */ 1505 1506 n_gpa = vcpu->arch.fault_gpa & ~0xF000000000000FFFULL; 1507 if (!(dsisr & DSISR_PRTABLE_FAULT)) 1508 n_gpa |= ea & 0xFFF; 1509 ret = kvmhv_translate_addr_nested(vcpu, gp, n_gpa, dsisr, &gpte); 1510 1511 /* 1512 * If the hardware found a translation but we don't now have a usable 1513 * translation in the l1 partition-scoped tree, remove the shadow pte 1514 * and let the guest retry. 1515 */ 1516 if (ret == RESUME_HOST && 1517 (dsisr & (DSISR_PROTFAULT | DSISR_BADACCESS | DSISR_NOEXEC_OR_G | 1518 DSISR_BAD_COPYPASTE))) 1519 goto inval; 1520 if (ret) 1521 return ret; 1522 1523 /* Failed to set the reference/change bits */ 1524 if (dsisr & DSISR_SET_RC) { 1525 ret = kvmhv_handle_nested_set_rc(vcpu, gp, n_gpa, gpte, dsisr); 1526 if (ret == RESUME_HOST) 1527 return ret; 1528 if (ret) 1529 goto inval; 1530 dsisr &= ~DSISR_SET_RC; 1531 if (!(dsisr & (DSISR_BAD_FAULT_64S | DSISR_NOHPTE | 1532 DSISR_PROTFAULT))) 1533 return RESUME_GUEST; 1534 } 1535 1536 /* 1537 * We took an HISI or HDSI while we were running a nested guest which 1538 * means we have no partition scoped translation for that. This means 1539 * we need to insert a pte for the mapping into our shadow_pgtable. 1540 */ 1541 1542 l1_shift = gpte.page_shift; 1543 if (l1_shift < PAGE_SHIFT) { 1544 /* We don't support l1 using a page size smaller than our own */ 1545 pr_err("KVM: L1 guest page shift (%d) less than our own (%d)\n", 1546 l1_shift, PAGE_SHIFT); 1547 return -EINVAL; 1548 } 1549 gpa = gpte.raddr; 1550 gfn = gpa >> PAGE_SHIFT; 1551 1552 /* 1. Get the corresponding host memslot */ 1553 1554 memslot = gfn_to_memslot(kvm, gfn); 1555 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) { 1556 if (dsisr & (DSISR_PRTABLE_FAULT | DSISR_BADACCESS)) { 1557 /* unusual error -> reflect to the guest as a DSI */ 1558 kvmppc_core_queue_data_storage(vcpu, ea, dsisr); 1559 return RESUME_GUEST; 1560 } 1561 1562 /* passthrough of emulated MMIO case */ 1563 return kvmppc_hv_emulate_mmio(vcpu, gpa, ea, writing); 1564 } 1565 if (memslot->flags & KVM_MEM_READONLY) { 1566 if (writing) { 1567 /* Give the guest a DSI */ 1568 kvmppc_core_queue_data_storage(vcpu, ea, 1569 DSISR_ISSTORE | DSISR_PROTFAULT); 1570 return RESUME_GUEST; 1571 } 1572 kvm_ro = true; 1573 } 1574 1575 /* 2. Find the host pte for this L1 guest real address */ 1576 1577 /* Used to check for invalidations in progress */ 1578 mmu_seq = kvm->mmu_notifier_seq; 1579 smp_rmb(); 1580 1581 /* See if can find translation in our partition scoped tables for L1 */ 1582 pte = __pte(0); 1583 spin_lock(&kvm->mmu_lock); 1584 pte_p = find_kvm_secondary_pte(kvm, gpa, &shift); 1585 if (!shift) 1586 shift = PAGE_SHIFT; 1587 if (pte_p) 1588 pte = *pte_p; 1589 spin_unlock(&kvm->mmu_lock); 1590 1591 if (!pte_present(pte) || (writing && !(pte_val(pte) & _PAGE_WRITE))) { 1592 /* No suitable pte found -> try to insert a mapping */ 1593 ret = kvmppc_book3s_instantiate_page(vcpu, gpa, memslot, 1594 writing, kvm_ro, &pte, &level); 1595 if (ret == -EAGAIN) 1596 return RESUME_GUEST; 1597 else if (ret) 1598 return ret; 1599 shift = kvmppc_radix_level_to_shift(level); 1600 } 1601 /* Align gfn to the start of the page */ 1602 gfn = (gpa & ~((1UL << shift) - 1)) >> PAGE_SHIFT; 1603 1604 /* 3. Compute the pte we need to insert for nest_gpa -> host r_addr */ 1605 1606 /* The permissions is the combination of the host and l1 guest ptes */ 1607 perm |= gpte.may_read ? 0UL : _PAGE_READ; 1608 perm |= gpte.may_write ? 0UL : _PAGE_WRITE; 1609 perm |= gpte.may_execute ? 0UL : _PAGE_EXEC; 1610 /* Only set accessed/dirty (rc) bits if set in host and l1 guest ptes */ 1611 perm |= (gpte.rc & _PAGE_ACCESSED) ? 0UL : _PAGE_ACCESSED; 1612 perm |= ((gpte.rc & _PAGE_DIRTY) && writing) ? 0UL : _PAGE_DIRTY; 1613 pte = __pte(pte_val(pte) & ~perm); 1614 1615 /* What size pte can we insert? */ 1616 if (shift > l1_shift) { 1617 u64 mask; 1618 unsigned int actual_shift = PAGE_SHIFT; 1619 if (PMD_SHIFT < l1_shift) 1620 actual_shift = PMD_SHIFT; 1621 mask = (1UL << shift) - (1UL << actual_shift); 1622 pte = __pte(pte_val(pte) | (gpa & mask)); 1623 shift = actual_shift; 1624 } 1625 level = kvmppc_radix_shift_to_level(shift); 1626 n_gpa &= ~((1UL << shift) - 1); 1627 1628 /* 4. Insert the pte into our shadow_pgtable */ 1629 1630 n_rmap = kzalloc(sizeof(*n_rmap), GFP_KERNEL); 1631 if (!n_rmap) 1632 return RESUME_GUEST; /* Let the guest try again */ 1633 n_rmap->rmap = (n_gpa & RMAP_NESTED_GPA_MASK) | 1634 (((unsigned long) gp->l1_lpid) << RMAP_NESTED_LPID_SHIFT); 1635 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; 1636 ret = kvmppc_create_pte(kvm, gp->shadow_pgtable, pte, n_gpa, level, 1637 mmu_seq, gp->shadow_lpid, rmapp, &n_rmap); 1638 kfree(n_rmap); 1639 if (ret == -EAGAIN) 1640 ret = RESUME_GUEST; /* Let the guest try again */ 1641 1642 return ret; 1643 1644 inval: 1645 kvmhv_invalidate_shadow_pte(vcpu, gp, n_gpa, NULL); 1646 return RESUME_GUEST; 1647 } 1648 1649 long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu) 1650 { 1651 struct kvm_nested_guest *gp = vcpu->arch.nested; 1652 long int ret; 1653 1654 mutex_lock(&gp->tlb_lock); 1655 ret = __kvmhv_nested_page_fault(vcpu, gp); 1656 mutex_unlock(&gp->tlb_lock); 1657 return ret; 1658 } 1659 1660 int kvmhv_nested_next_lpid(struct kvm *kvm, int lpid) 1661 { 1662 int ret = -1; 1663 1664 spin_lock(&kvm->mmu_lock); 1665 while (++lpid <= kvm->arch.max_nested_lpid) { 1666 if (kvm->arch.nested_guests[lpid]) { 1667 ret = lpid; 1668 break; 1669 } 1670 } 1671 spin_unlock(&kvm->mmu_lock); 1672 return ret; 1673 } 1674