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 | LPCR_MER; 265 266 /* 267 * Additional filtering is required depending on hardware 268 * and configuration. 269 */ 270 *lpcr = kvmppc_filter_lpcr_hv(vcpu->kvm, 271 (vc->lpcr & ~mask) | (*lpcr & mask)); 272 273 /* 274 * Don't let L1 enable features for L2 which we don't allow for L1, 275 * but preserve the interrupt cause field. 276 */ 277 vcpu->arch.hfscr = l2_hv->hfscr & (HFSCR_INTR_CAUSE | vcpu->arch.hfscr_permitted); 278 279 /* Don't let data address watchpoint match in hypervisor state */ 280 vcpu->arch.dawrx0 = l2_hv->dawrx0 & ~DAWRX_HYP; 281 vcpu->arch.dawrx1 = l2_hv->dawrx1 & ~DAWRX_HYP; 282 283 /* Don't let completed instruction address breakpt match in HV state */ 284 if ((l2_hv->ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) 285 vcpu->arch.ciabr = l2_hv->ciabr & ~CIABR_PRIV; 286 } 287 288 long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu) 289 { 290 long int err, r; 291 struct kvm_nested_guest *l2; 292 struct pt_regs l2_regs, saved_l1_regs; 293 struct hv_guest_state l2_hv = {0}, saved_l1_hv; 294 struct kvmppc_vcore *vc = vcpu->arch.vcore; 295 u64 hv_ptr, regs_ptr; 296 u64 hdec_exp, lpcr; 297 s64 delta_purr, delta_spurr, delta_ic, delta_vtb; 298 299 if (vcpu->kvm->arch.l1_ptcr == 0) 300 return H_NOT_AVAILABLE; 301 302 if (MSR_TM_TRANSACTIONAL(vcpu->arch.shregs.msr)) 303 return H_BAD_MODE; 304 305 /* copy parameters in */ 306 hv_ptr = kvmppc_get_gpr(vcpu, 4); 307 regs_ptr = kvmppc_get_gpr(vcpu, 5); 308 kvm_vcpu_srcu_read_lock(vcpu); 309 err = kvmhv_read_guest_state_and_regs(vcpu, &l2_hv, &l2_regs, 310 hv_ptr, regs_ptr); 311 kvm_vcpu_srcu_read_unlock(vcpu); 312 if (err) 313 return H_PARAMETER; 314 315 if (kvmppc_need_byteswap(vcpu)) 316 byteswap_hv_regs(&l2_hv); 317 if (l2_hv.version > HV_GUEST_STATE_VERSION) 318 return H_P2; 319 320 if (kvmppc_need_byteswap(vcpu)) 321 byteswap_pt_regs(&l2_regs); 322 if (l2_hv.vcpu_token >= NR_CPUS) 323 return H_PARAMETER; 324 325 /* 326 * L1 must have set up a suspended state to enter the L2 in a 327 * transactional state, and only in that case. These have to be 328 * filtered out here to prevent causing a TM Bad Thing in the 329 * host HRFID. We could synthesize a TM Bad Thing back to the L1 330 * here but there doesn't seem like much point. 331 */ 332 if (MSR_TM_SUSPENDED(vcpu->arch.shregs.msr)) { 333 if (!MSR_TM_ACTIVE(l2_regs.msr)) 334 return H_BAD_MODE; 335 } else { 336 if (l2_regs.msr & MSR_TS_MASK) 337 return H_BAD_MODE; 338 if (WARN_ON_ONCE(vcpu->arch.shregs.msr & MSR_TS_MASK)) 339 return H_BAD_MODE; 340 } 341 342 /* translate lpid */ 343 l2 = kvmhv_get_nested(vcpu->kvm, l2_hv.lpid, true); 344 if (!l2) 345 return H_PARAMETER; 346 if (!l2->l1_gr_to_hr) { 347 mutex_lock(&l2->tlb_lock); 348 kvmhv_update_ptbl_cache(l2); 349 mutex_unlock(&l2->tlb_lock); 350 } 351 352 /* save l1 values of things */ 353 vcpu->arch.regs.msr = vcpu->arch.shregs.msr; 354 saved_l1_regs = vcpu->arch.regs; 355 kvmhv_save_hv_regs(vcpu, &saved_l1_hv); 356 357 /* convert TB values/offsets to host (L0) values */ 358 hdec_exp = l2_hv.hdec_expiry - vc->tb_offset; 359 vc->tb_offset += l2_hv.tb_offset; 360 vcpu->arch.dec_expires += 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 vcpu->arch.nested_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 r = kvmhv_run_single_vcpu(vcpu, hdec_exp, lpcr); 378 } while (is_kvmppc_resume_guest(r)); 379 380 /* save L2 state for return */ 381 l2_regs = vcpu->arch.regs; 382 l2_regs.msr = vcpu->arch.shregs.msr; 383 delta_purr = vcpu->arch.purr - l2_hv.purr; 384 delta_spurr = vcpu->arch.spurr - l2_hv.spurr; 385 delta_ic = vcpu->arch.ic - l2_hv.ic; 386 delta_vtb = vc->vtb - l2_hv.vtb; 387 save_hv_return_state(vcpu, &l2_hv); 388 389 /* restore L1 state */ 390 vcpu->arch.nested = NULL; 391 vcpu->arch.regs = saved_l1_regs; 392 vcpu->arch.shregs.msr = saved_l1_regs.msr & ~MSR_TS_MASK; 393 /* set L1 MSR TS field according to L2 transaction state */ 394 if (l2_regs.msr & MSR_TS_MASK) 395 vcpu->arch.shregs.msr |= MSR_TS_S; 396 vc->tb_offset = saved_l1_hv.tb_offset; 397 /* XXX: is this always the same delta as saved_l1_hv.tb_offset? */ 398 vcpu->arch.dec_expires -= l2_hv.tb_offset; 399 restore_hv_regs(vcpu, &saved_l1_hv); 400 vcpu->arch.purr += delta_purr; 401 vcpu->arch.spurr += delta_spurr; 402 vcpu->arch.ic += delta_ic; 403 vc->vtb += delta_vtb; 404 405 kvmhv_put_nested(l2); 406 407 /* copy l2_hv_state and regs back to guest */ 408 if (kvmppc_need_byteswap(vcpu)) { 409 byteswap_hv_regs(&l2_hv); 410 byteswap_pt_regs(&l2_regs); 411 } 412 kvm_vcpu_srcu_read_lock(vcpu); 413 err = kvmhv_write_guest_state_and_regs(vcpu, &l2_hv, &l2_regs, 414 hv_ptr, regs_ptr); 415 kvm_vcpu_srcu_read_unlock(vcpu); 416 if (err) 417 return H_AUTHORITY; 418 419 if (r == -EINTR) 420 return H_INTERRUPT; 421 422 if (vcpu->mmio_needed) { 423 kvmhv_nested_mmio_needed(vcpu, regs_ptr); 424 return H_TOO_HARD; 425 } 426 427 return vcpu->arch.trap; 428 } 429 430 long kvmhv_nested_init(void) 431 { 432 long int ptb_order; 433 unsigned long ptcr; 434 long rc; 435 436 if (!kvmhv_on_pseries()) 437 return 0; 438 if (!radix_enabled()) 439 return -ENODEV; 440 441 /* Partition table entry is 1<<4 bytes in size, hence the 4. */ 442 ptb_order = KVM_MAX_NESTED_GUESTS_SHIFT + 4; 443 /* Minimum partition table size is 1<<12 bytes */ 444 if (ptb_order < 12) 445 ptb_order = 12; 446 pseries_partition_tb = kmalloc(sizeof(struct patb_entry) << ptb_order, 447 GFP_KERNEL); 448 if (!pseries_partition_tb) { 449 pr_err("kvm-hv: failed to allocated nested partition table\n"); 450 return -ENOMEM; 451 } 452 453 ptcr = __pa(pseries_partition_tb) | (ptb_order - 12); 454 rc = plpar_hcall_norets(H_SET_PARTITION_TABLE, ptcr); 455 if (rc != H_SUCCESS) { 456 pr_err("kvm-hv: Parent hypervisor does not support nesting (rc=%ld)\n", 457 rc); 458 kfree(pseries_partition_tb); 459 pseries_partition_tb = NULL; 460 return -ENODEV; 461 } 462 463 return 0; 464 } 465 466 void kvmhv_nested_exit(void) 467 { 468 /* 469 * N.B. the kvmhv_on_pseries() test is there because it enables 470 * the compiler to remove the call to plpar_hcall_norets() 471 * when CONFIG_PPC_PSERIES=n. 472 */ 473 if (kvmhv_on_pseries() && pseries_partition_tb) { 474 plpar_hcall_norets(H_SET_PARTITION_TABLE, 0); 475 kfree(pseries_partition_tb); 476 pseries_partition_tb = NULL; 477 } 478 } 479 480 static void kvmhv_flush_lpid(unsigned int lpid) 481 { 482 long rc; 483 484 if (!kvmhv_on_pseries()) { 485 radix__flush_all_lpid(lpid); 486 return; 487 } 488 489 if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE)) 490 rc = plpar_hcall_norets(H_TLB_INVALIDATE, H_TLBIE_P1_ENC(2, 0, 1), 491 lpid, TLBIEL_INVAL_SET_LPID); 492 else 493 rc = pseries_rpt_invalidate(lpid, H_RPTI_TARGET_CMMU, 494 H_RPTI_TYPE_NESTED | 495 H_RPTI_TYPE_TLB | H_RPTI_TYPE_PWC | 496 H_RPTI_TYPE_PAT, 497 H_RPTI_PAGE_ALL, 0, -1UL); 498 if (rc) 499 pr_err("KVM: TLB LPID invalidation hcall failed, rc=%ld\n", rc); 500 } 501 502 void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1) 503 { 504 if (!kvmhv_on_pseries()) { 505 mmu_partition_table_set_entry(lpid, dw0, dw1, true); 506 return; 507 } 508 509 pseries_partition_tb[lpid].patb0 = cpu_to_be64(dw0); 510 pseries_partition_tb[lpid].patb1 = cpu_to_be64(dw1); 511 /* L0 will do the necessary barriers */ 512 kvmhv_flush_lpid(lpid); 513 } 514 515 static void kvmhv_set_nested_ptbl(struct kvm_nested_guest *gp) 516 { 517 unsigned long dw0; 518 519 dw0 = PATB_HR | radix__get_tree_size() | 520 __pa(gp->shadow_pgtable) | RADIX_PGD_INDEX_SIZE; 521 kvmhv_set_ptbl_entry(gp->shadow_lpid, dw0, gp->process_table); 522 } 523 524 /* 525 * Handle the H_SET_PARTITION_TABLE hcall. 526 * r4 = guest real address of partition table + log_2(size) - 12 527 * (formatted as for the PTCR). 528 */ 529 long kvmhv_set_partition_table(struct kvm_vcpu *vcpu) 530 { 531 struct kvm *kvm = vcpu->kvm; 532 unsigned long ptcr = kvmppc_get_gpr(vcpu, 4); 533 int srcu_idx; 534 long ret = H_SUCCESS; 535 536 srcu_idx = srcu_read_lock(&kvm->srcu); 537 /* Check partition size and base address. */ 538 if ((ptcr & PRTS_MASK) + 12 - 4 > KVM_MAX_NESTED_GUESTS_SHIFT || 539 !kvm_is_visible_gfn(vcpu->kvm, (ptcr & PRTB_MASK) >> PAGE_SHIFT)) 540 ret = H_PARAMETER; 541 srcu_read_unlock(&kvm->srcu, srcu_idx); 542 if (ret == H_SUCCESS) 543 kvm->arch.l1_ptcr = ptcr; 544 545 return ret; 546 } 547 548 /* 549 * Handle the H_COPY_TOFROM_GUEST hcall. 550 * r4 = L1 lpid of nested guest 551 * r5 = pid 552 * r6 = eaddr to access 553 * r7 = to buffer (L1 gpa) 554 * r8 = from buffer (L1 gpa) 555 * r9 = n bytes to copy 556 */ 557 long kvmhv_copy_tofrom_guest_nested(struct kvm_vcpu *vcpu) 558 { 559 struct kvm_nested_guest *gp; 560 int l1_lpid = kvmppc_get_gpr(vcpu, 4); 561 int pid = kvmppc_get_gpr(vcpu, 5); 562 gva_t eaddr = kvmppc_get_gpr(vcpu, 6); 563 gpa_t gp_to = (gpa_t) kvmppc_get_gpr(vcpu, 7); 564 gpa_t gp_from = (gpa_t) kvmppc_get_gpr(vcpu, 8); 565 void *buf; 566 unsigned long n = kvmppc_get_gpr(vcpu, 9); 567 bool is_load = !!gp_to; 568 long rc; 569 570 if (gp_to && gp_from) /* One must be NULL to determine the direction */ 571 return H_PARAMETER; 572 573 if (eaddr & (0xFFFUL << 52)) 574 return H_PARAMETER; 575 576 buf = kzalloc(n, GFP_KERNEL | __GFP_NOWARN); 577 if (!buf) 578 return H_NO_MEM; 579 580 gp = kvmhv_get_nested(vcpu->kvm, l1_lpid, false); 581 if (!gp) { 582 rc = H_PARAMETER; 583 goto out_free; 584 } 585 586 mutex_lock(&gp->tlb_lock); 587 588 if (is_load) { 589 /* Load from the nested guest into our buffer */ 590 rc = __kvmhv_copy_tofrom_guest_radix(gp->shadow_lpid, pid, 591 eaddr, buf, NULL, n); 592 if (rc) 593 goto not_found; 594 595 /* Write what was loaded into our buffer back to the L1 guest */ 596 kvm_vcpu_srcu_read_lock(vcpu); 597 rc = kvm_vcpu_write_guest(vcpu, gp_to, buf, n); 598 kvm_vcpu_srcu_read_unlock(vcpu); 599 if (rc) 600 goto not_found; 601 } else { 602 /* Load the data to be stored from the L1 guest into our buf */ 603 kvm_vcpu_srcu_read_lock(vcpu); 604 rc = kvm_vcpu_read_guest(vcpu, gp_from, buf, n); 605 kvm_vcpu_srcu_read_unlock(vcpu); 606 if (rc) 607 goto not_found; 608 609 /* Store from our buffer into the nested guest */ 610 rc = __kvmhv_copy_tofrom_guest_radix(gp->shadow_lpid, pid, 611 eaddr, NULL, buf, n); 612 if (rc) 613 goto not_found; 614 } 615 616 out_unlock: 617 mutex_unlock(&gp->tlb_lock); 618 kvmhv_put_nested(gp); 619 out_free: 620 kfree(buf); 621 return rc; 622 not_found: 623 rc = H_NOT_FOUND; 624 goto out_unlock; 625 } 626 627 /* 628 * Reload the partition table entry for a guest. 629 * Caller must hold gp->tlb_lock. 630 */ 631 static void kvmhv_update_ptbl_cache(struct kvm_nested_guest *gp) 632 { 633 int ret; 634 struct patb_entry ptbl_entry; 635 unsigned long ptbl_addr; 636 struct kvm *kvm = gp->l1_host; 637 638 ret = -EFAULT; 639 ptbl_addr = (kvm->arch.l1_ptcr & PRTB_MASK) + (gp->l1_lpid << 4); 640 if (gp->l1_lpid < (1ul << ((kvm->arch.l1_ptcr & PRTS_MASK) + 12 - 4))) { 641 int srcu_idx = srcu_read_lock(&kvm->srcu); 642 ret = kvm_read_guest(kvm, ptbl_addr, 643 &ptbl_entry, sizeof(ptbl_entry)); 644 srcu_read_unlock(&kvm->srcu, srcu_idx); 645 } 646 if (ret) { 647 gp->l1_gr_to_hr = 0; 648 gp->process_table = 0; 649 } else { 650 gp->l1_gr_to_hr = be64_to_cpu(ptbl_entry.patb0); 651 gp->process_table = be64_to_cpu(ptbl_entry.patb1); 652 } 653 kvmhv_set_nested_ptbl(gp); 654 } 655 656 void kvmhv_vm_nested_init(struct kvm *kvm) 657 { 658 idr_init(&kvm->arch.kvm_nested_guest_idr); 659 } 660 661 static struct kvm_nested_guest *__find_nested(struct kvm *kvm, int lpid) 662 { 663 return idr_find(&kvm->arch.kvm_nested_guest_idr, lpid); 664 } 665 666 static bool __prealloc_nested(struct kvm *kvm, int lpid) 667 { 668 if (idr_alloc(&kvm->arch.kvm_nested_guest_idr, 669 NULL, lpid, lpid + 1, GFP_KERNEL) != lpid) 670 return false; 671 return true; 672 } 673 674 static void __add_nested(struct kvm *kvm, int lpid, struct kvm_nested_guest *gp) 675 { 676 if (idr_replace(&kvm->arch.kvm_nested_guest_idr, gp, lpid)) 677 WARN_ON(1); 678 } 679 680 static void __remove_nested(struct kvm *kvm, int lpid) 681 { 682 idr_remove(&kvm->arch.kvm_nested_guest_idr, lpid); 683 } 684 685 static struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm *kvm, unsigned int lpid) 686 { 687 struct kvm_nested_guest *gp; 688 long shadow_lpid; 689 690 gp = kzalloc(sizeof(*gp), GFP_KERNEL); 691 if (!gp) 692 return NULL; 693 gp->l1_host = kvm; 694 gp->l1_lpid = lpid; 695 mutex_init(&gp->tlb_lock); 696 gp->shadow_pgtable = pgd_alloc(kvm->mm); 697 if (!gp->shadow_pgtable) 698 goto out_free; 699 shadow_lpid = kvmppc_alloc_lpid(); 700 if (shadow_lpid < 0) 701 goto out_free2; 702 gp->shadow_lpid = shadow_lpid; 703 gp->radix = 1; 704 705 memset(gp->prev_cpu, -1, sizeof(gp->prev_cpu)); 706 707 return gp; 708 709 out_free2: 710 pgd_free(kvm->mm, gp->shadow_pgtable); 711 out_free: 712 kfree(gp); 713 return NULL; 714 } 715 716 /* 717 * Free up any resources allocated for a nested guest. 718 */ 719 static void kvmhv_release_nested(struct kvm_nested_guest *gp) 720 { 721 struct kvm *kvm = gp->l1_host; 722 723 if (gp->shadow_pgtable) { 724 /* 725 * No vcpu is using this struct and no call to 726 * kvmhv_get_nested can find this struct, 727 * so we don't need to hold kvm->mmu_lock. 728 */ 729 kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, 730 gp->shadow_lpid); 731 pgd_free(kvm->mm, gp->shadow_pgtable); 732 } 733 kvmhv_set_ptbl_entry(gp->shadow_lpid, 0, 0); 734 kvmppc_free_lpid(gp->shadow_lpid); 735 kfree(gp); 736 } 737 738 static void kvmhv_remove_nested(struct kvm_nested_guest *gp) 739 { 740 struct kvm *kvm = gp->l1_host; 741 int lpid = gp->l1_lpid; 742 long ref; 743 744 spin_lock(&kvm->mmu_lock); 745 if (gp == __find_nested(kvm, lpid)) { 746 __remove_nested(kvm, lpid); 747 --gp->refcnt; 748 } 749 ref = gp->refcnt; 750 spin_unlock(&kvm->mmu_lock); 751 if (ref == 0) 752 kvmhv_release_nested(gp); 753 } 754 755 /* 756 * Free up all nested resources allocated for this guest. 757 * This is called with no vcpus of the guest running, when 758 * switching the guest to HPT mode or when destroying the 759 * guest. 760 */ 761 void kvmhv_release_all_nested(struct kvm *kvm) 762 { 763 int lpid; 764 struct kvm_nested_guest *gp; 765 struct kvm_nested_guest *freelist = NULL; 766 struct kvm_memory_slot *memslot; 767 int srcu_idx, bkt; 768 769 spin_lock(&kvm->mmu_lock); 770 idr_for_each_entry(&kvm->arch.kvm_nested_guest_idr, gp, lpid) { 771 __remove_nested(kvm, lpid); 772 if (--gp->refcnt == 0) { 773 gp->next = freelist; 774 freelist = gp; 775 } 776 } 777 idr_destroy(&kvm->arch.kvm_nested_guest_idr); 778 /* idr is empty and may be reused at this point */ 779 spin_unlock(&kvm->mmu_lock); 780 while ((gp = freelist) != NULL) { 781 freelist = gp->next; 782 kvmhv_release_nested(gp); 783 } 784 785 srcu_idx = srcu_read_lock(&kvm->srcu); 786 kvm_for_each_memslot(memslot, bkt, kvm_memslots(kvm)) 787 kvmhv_free_memslot_nest_rmap(memslot); 788 srcu_read_unlock(&kvm->srcu, srcu_idx); 789 } 790 791 /* caller must hold gp->tlb_lock */ 792 static void kvmhv_flush_nested(struct kvm_nested_guest *gp) 793 { 794 struct kvm *kvm = gp->l1_host; 795 796 spin_lock(&kvm->mmu_lock); 797 kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, gp->shadow_lpid); 798 spin_unlock(&kvm->mmu_lock); 799 kvmhv_flush_lpid(gp->shadow_lpid); 800 kvmhv_update_ptbl_cache(gp); 801 if (gp->l1_gr_to_hr == 0) 802 kvmhv_remove_nested(gp); 803 } 804 805 struct kvm_nested_guest *kvmhv_get_nested(struct kvm *kvm, int l1_lpid, 806 bool create) 807 { 808 struct kvm_nested_guest *gp, *newgp; 809 810 if (l1_lpid >= (1ul << ((kvm->arch.l1_ptcr & PRTS_MASK) + 12 - 4))) 811 return NULL; 812 813 spin_lock(&kvm->mmu_lock); 814 gp = __find_nested(kvm, l1_lpid); 815 if (gp) 816 ++gp->refcnt; 817 spin_unlock(&kvm->mmu_lock); 818 819 if (gp || !create) 820 return gp; 821 822 newgp = kvmhv_alloc_nested(kvm, l1_lpid); 823 if (!newgp) 824 return NULL; 825 826 if (!__prealloc_nested(kvm, l1_lpid)) { 827 kvmhv_release_nested(newgp); 828 return NULL; 829 } 830 831 spin_lock(&kvm->mmu_lock); 832 gp = __find_nested(kvm, l1_lpid); 833 if (!gp) { 834 __add_nested(kvm, l1_lpid, newgp); 835 ++newgp->refcnt; 836 gp = newgp; 837 newgp = NULL; 838 } 839 ++gp->refcnt; 840 spin_unlock(&kvm->mmu_lock); 841 842 if (newgp) 843 kvmhv_release_nested(newgp); 844 845 return gp; 846 } 847 848 void kvmhv_put_nested(struct kvm_nested_guest *gp) 849 { 850 struct kvm *kvm = gp->l1_host; 851 long ref; 852 853 spin_lock(&kvm->mmu_lock); 854 ref = --gp->refcnt; 855 spin_unlock(&kvm->mmu_lock); 856 if (ref == 0) 857 kvmhv_release_nested(gp); 858 } 859 860 pte_t *find_kvm_nested_guest_pte(struct kvm *kvm, unsigned long lpid, 861 unsigned long ea, unsigned *hshift) 862 { 863 struct kvm_nested_guest *gp; 864 pte_t *pte; 865 866 gp = __find_nested(kvm, lpid); 867 if (!gp) 868 return NULL; 869 870 VM_WARN(!spin_is_locked(&kvm->mmu_lock), 871 "%s called with kvm mmu_lock not held \n", __func__); 872 pte = __find_linux_pte(gp->shadow_pgtable, ea, NULL, hshift); 873 874 return pte; 875 } 876 877 static inline bool kvmhv_n_rmap_is_equal(u64 rmap_1, u64 rmap_2) 878 { 879 return !((rmap_1 ^ rmap_2) & (RMAP_NESTED_LPID_MASK | 880 RMAP_NESTED_GPA_MASK)); 881 } 882 883 void kvmhv_insert_nest_rmap(struct kvm *kvm, unsigned long *rmapp, 884 struct rmap_nested **n_rmap) 885 { 886 struct llist_node *entry = ((struct llist_head *) rmapp)->first; 887 struct rmap_nested *cursor; 888 u64 rmap, new_rmap = (*n_rmap)->rmap; 889 890 /* Are there any existing entries? */ 891 if (!(*rmapp)) { 892 /* No -> use the rmap as a single entry */ 893 *rmapp = new_rmap | RMAP_NESTED_IS_SINGLE_ENTRY; 894 return; 895 } 896 897 /* Do any entries match what we're trying to insert? */ 898 for_each_nest_rmap_safe(cursor, entry, &rmap) { 899 if (kvmhv_n_rmap_is_equal(rmap, new_rmap)) 900 return; 901 } 902 903 /* Do we need to create a list or just add the new entry? */ 904 rmap = *rmapp; 905 if (rmap & RMAP_NESTED_IS_SINGLE_ENTRY) /* Not previously a list */ 906 *rmapp = 0UL; 907 llist_add(&((*n_rmap)->list), (struct llist_head *) rmapp); 908 if (rmap & RMAP_NESTED_IS_SINGLE_ENTRY) /* Not previously a list */ 909 (*n_rmap)->list.next = (struct llist_node *) rmap; 910 911 /* Set NULL so not freed by caller */ 912 *n_rmap = NULL; 913 } 914 915 static void kvmhv_update_nest_rmap_rc(struct kvm *kvm, u64 n_rmap, 916 unsigned long clr, unsigned long set, 917 unsigned long hpa, unsigned long mask) 918 { 919 unsigned long gpa; 920 unsigned int shift, lpid; 921 pte_t *ptep; 922 923 gpa = n_rmap & RMAP_NESTED_GPA_MASK; 924 lpid = (n_rmap & RMAP_NESTED_LPID_MASK) >> RMAP_NESTED_LPID_SHIFT; 925 926 /* Find the pte */ 927 ptep = find_kvm_nested_guest_pte(kvm, lpid, gpa, &shift); 928 /* 929 * If the pte is present and the pfn is still the same, update the pte. 930 * If the pfn has changed then this is a stale rmap entry, the nested 931 * gpa actually points somewhere else now, and there is nothing to do. 932 * XXX A future optimisation would be to remove the rmap entry here. 933 */ 934 if (ptep && pte_present(*ptep) && ((pte_val(*ptep) & mask) == hpa)) { 935 __radix_pte_update(ptep, clr, set); 936 kvmppc_radix_tlbie_page(kvm, gpa, shift, lpid); 937 } 938 } 939 940 /* 941 * For a given list of rmap entries, update the rc bits in all ptes in shadow 942 * page tables for nested guests which are referenced by the rmap list. 943 */ 944 void kvmhv_update_nest_rmap_rc_list(struct kvm *kvm, unsigned long *rmapp, 945 unsigned long clr, unsigned long set, 946 unsigned long hpa, unsigned long nbytes) 947 { 948 struct llist_node *entry = ((struct llist_head *) rmapp)->first; 949 struct rmap_nested *cursor; 950 unsigned long rmap, mask; 951 952 if ((clr | set) & ~(_PAGE_DIRTY | _PAGE_ACCESSED)) 953 return; 954 955 mask = PTE_RPN_MASK & ~(nbytes - 1); 956 hpa &= mask; 957 958 for_each_nest_rmap_safe(cursor, entry, &rmap) 959 kvmhv_update_nest_rmap_rc(kvm, rmap, clr, set, hpa, mask); 960 } 961 962 static void kvmhv_remove_nest_rmap(struct kvm *kvm, u64 n_rmap, 963 unsigned long hpa, unsigned long mask) 964 { 965 struct kvm_nested_guest *gp; 966 unsigned long gpa; 967 unsigned int shift, lpid; 968 pte_t *ptep; 969 970 gpa = n_rmap & RMAP_NESTED_GPA_MASK; 971 lpid = (n_rmap & RMAP_NESTED_LPID_MASK) >> RMAP_NESTED_LPID_SHIFT; 972 gp = __find_nested(kvm, lpid); 973 if (!gp) 974 return; 975 976 /* Find and invalidate the pte */ 977 ptep = find_kvm_nested_guest_pte(kvm, lpid, gpa, &shift); 978 /* Don't spuriously invalidate ptes if the pfn has changed */ 979 if (ptep && pte_present(*ptep) && ((pte_val(*ptep) & mask) == hpa)) 980 kvmppc_unmap_pte(kvm, ptep, gpa, shift, NULL, gp->shadow_lpid); 981 } 982 983 static void kvmhv_remove_nest_rmap_list(struct kvm *kvm, unsigned long *rmapp, 984 unsigned long hpa, unsigned long mask) 985 { 986 struct llist_node *entry = llist_del_all((struct llist_head *) rmapp); 987 struct rmap_nested *cursor; 988 unsigned long rmap; 989 990 for_each_nest_rmap_safe(cursor, entry, &rmap) { 991 kvmhv_remove_nest_rmap(kvm, rmap, hpa, mask); 992 kfree(cursor); 993 } 994 } 995 996 /* called with kvm->mmu_lock held */ 997 void kvmhv_remove_nest_rmap_range(struct kvm *kvm, 998 const struct kvm_memory_slot *memslot, 999 unsigned long gpa, unsigned long hpa, 1000 unsigned long nbytes) 1001 { 1002 unsigned long gfn, end_gfn; 1003 unsigned long addr_mask; 1004 1005 if (!memslot) 1006 return; 1007 gfn = (gpa >> PAGE_SHIFT) - memslot->base_gfn; 1008 end_gfn = gfn + (nbytes >> PAGE_SHIFT); 1009 1010 addr_mask = PTE_RPN_MASK & ~(nbytes - 1); 1011 hpa &= addr_mask; 1012 1013 for (; gfn < end_gfn; gfn++) { 1014 unsigned long *rmap = &memslot->arch.rmap[gfn]; 1015 kvmhv_remove_nest_rmap_list(kvm, rmap, hpa, addr_mask); 1016 } 1017 } 1018 1019 static void kvmhv_free_memslot_nest_rmap(struct kvm_memory_slot *free) 1020 { 1021 unsigned long page; 1022 1023 for (page = 0; page < free->npages; page++) { 1024 unsigned long rmap, *rmapp = &free->arch.rmap[page]; 1025 struct rmap_nested *cursor; 1026 struct llist_node *entry; 1027 1028 entry = llist_del_all((struct llist_head *) rmapp); 1029 for_each_nest_rmap_safe(cursor, entry, &rmap) 1030 kfree(cursor); 1031 } 1032 } 1033 1034 static bool kvmhv_invalidate_shadow_pte(struct kvm_vcpu *vcpu, 1035 struct kvm_nested_guest *gp, 1036 long gpa, int *shift_ret) 1037 { 1038 struct kvm *kvm = vcpu->kvm; 1039 bool ret = false; 1040 pte_t *ptep; 1041 int shift; 1042 1043 spin_lock(&kvm->mmu_lock); 1044 ptep = find_kvm_nested_guest_pte(kvm, gp->l1_lpid, gpa, &shift); 1045 if (!shift) 1046 shift = PAGE_SHIFT; 1047 if (ptep && pte_present(*ptep)) { 1048 kvmppc_unmap_pte(kvm, ptep, gpa, shift, NULL, gp->shadow_lpid); 1049 ret = true; 1050 } 1051 spin_unlock(&kvm->mmu_lock); 1052 1053 if (shift_ret) 1054 *shift_ret = shift; 1055 return ret; 1056 } 1057 1058 static inline int get_ric(unsigned int instr) 1059 { 1060 return (instr >> 18) & 0x3; 1061 } 1062 1063 static inline int get_prs(unsigned int instr) 1064 { 1065 return (instr >> 17) & 0x1; 1066 } 1067 1068 static inline int get_r(unsigned int instr) 1069 { 1070 return (instr >> 16) & 0x1; 1071 } 1072 1073 static inline int get_lpid(unsigned long r_val) 1074 { 1075 return r_val & 0xffffffff; 1076 } 1077 1078 static inline int get_is(unsigned long r_val) 1079 { 1080 return (r_val >> 10) & 0x3; 1081 } 1082 1083 static inline int get_ap(unsigned long r_val) 1084 { 1085 return (r_val >> 5) & 0x7; 1086 } 1087 1088 static inline long get_epn(unsigned long r_val) 1089 { 1090 return r_val >> 12; 1091 } 1092 1093 static int kvmhv_emulate_tlbie_tlb_addr(struct kvm_vcpu *vcpu, int lpid, 1094 int ap, long epn) 1095 { 1096 struct kvm *kvm = vcpu->kvm; 1097 struct kvm_nested_guest *gp; 1098 long npages; 1099 int shift, shadow_shift; 1100 unsigned long addr; 1101 1102 shift = ap_to_shift(ap); 1103 addr = epn << 12; 1104 if (shift < 0) 1105 /* Invalid ap encoding */ 1106 return -EINVAL; 1107 1108 addr &= ~((1UL << shift) - 1); 1109 npages = 1UL << (shift - PAGE_SHIFT); 1110 1111 gp = kvmhv_get_nested(kvm, lpid, false); 1112 if (!gp) /* No such guest -> nothing to do */ 1113 return 0; 1114 mutex_lock(&gp->tlb_lock); 1115 1116 /* There may be more than one host page backing this single guest pte */ 1117 do { 1118 kvmhv_invalidate_shadow_pte(vcpu, gp, addr, &shadow_shift); 1119 1120 npages -= 1UL << (shadow_shift - PAGE_SHIFT); 1121 addr += 1UL << shadow_shift; 1122 } while (npages > 0); 1123 1124 mutex_unlock(&gp->tlb_lock); 1125 kvmhv_put_nested(gp); 1126 return 0; 1127 } 1128 1129 static void kvmhv_emulate_tlbie_lpid(struct kvm_vcpu *vcpu, 1130 struct kvm_nested_guest *gp, int ric) 1131 { 1132 struct kvm *kvm = vcpu->kvm; 1133 1134 mutex_lock(&gp->tlb_lock); 1135 switch (ric) { 1136 case 0: 1137 /* Invalidate TLB */ 1138 spin_lock(&kvm->mmu_lock); 1139 kvmppc_free_pgtable_radix(kvm, gp->shadow_pgtable, 1140 gp->shadow_lpid); 1141 kvmhv_flush_lpid(gp->shadow_lpid); 1142 spin_unlock(&kvm->mmu_lock); 1143 break; 1144 case 1: 1145 /* 1146 * Invalidate PWC 1147 * We don't cache this -> nothing to do 1148 */ 1149 break; 1150 case 2: 1151 /* Invalidate TLB, PWC and caching of partition table entries */ 1152 kvmhv_flush_nested(gp); 1153 break; 1154 default: 1155 break; 1156 } 1157 mutex_unlock(&gp->tlb_lock); 1158 } 1159 1160 static void kvmhv_emulate_tlbie_all_lpid(struct kvm_vcpu *vcpu, int ric) 1161 { 1162 struct kvm *kvm = vcpu->kvm; 1163 struct kvm_nested_guest *gp; 1164 int lpid; 1165 1166 spin_lock(&kvm->mmu_lock); 1167 idr_for_each_entry(&kvm->arch.kvm_nested_guest_idr, gp, lpid) { 1168 spin_unlock(&kvm->mmu_lock); 1169 kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); 1170 spin_lock(&kvm->mmu_lock); 1171 } 1172 spin_unlock(&kvm->mmu_lock); 1173 } 1174 1175 static int kvmhv_emulate_priv_tlbie(struct kvm_vcpu *vcpu, unsigned int instr, 1176 unsigned long rsval, unsigned long rbval) 1177 { 1178 struct kvm *kvm = vcpu->kvm; 1179 struct kvm_nested_guest *gp; 1180 int r, ric, prs, is, ap; 1181 int lpid; 1182 long epn; 1183 int ret = 0; 1184 1185 ric = get_ric(instr); 1186 prs = get_prs(instr); 1187 r = get_r(instr); 1188 lpid = get_lpid(rsval); 1189 is = get_is(rbval); 1190 1191 /* 1192 * These cases are invalid and are not handled: 1193 * r != 1 -> Only radix supported 1194 * prs == 1 -> Not HV privileged 1195 * ric == 3 -> No cluster bombs for radix 1196 * is == 1 -> Partition scoped translations not associated with pid 1197 * (!is) && (ric == 1 || ric == 2) -> Not supported by ISA 1198 */ 1199 if ((!r) || (prs) || (ric == 3) || (is == 1) || 1200 ((!is) && (ric == 1 || ric == 2))) 1201 return -EINVAL; 1202 1203 switch (is) { 1204 case 0: 1205 /* 1206 * We know ric == 0 1207 * Invalidate TLB for a given target address 1208 */ 1209 epn = get_epn(rbval); 1210 ap = get_ap(rbval); 1211 ret = kvmhv_emulate_tlbie_tlb_addr(vcpu, lpid, ap, epn); 1212 break; 1213 case 2: 1214 /* Invalidate matching LPID */ 1215 gp = kvmhv_get_nested(kvm, lpid, false); 1216 if (gp) { 1217 kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); 1218 kvmhv_put_nested(gp); 1219 } 1220 break; 1221 case 3: 1222 /* Invalidate ALL LPIDs */ 1223 kvmhv_emulate_tlbie_all_lpid(vcpu, ric); 1224 break; 1225 default: 1226 ret = -EINVAL; 1227 break; 1228 } 1229 1230 return ret; 1231 } 1232 1233 /* 1234 * This handles the H_TLB_INVALIDATE hcall. 1235 * Parameters are (r4) tlbie instruction code, (r5) rS contents, 1236 * (r6) rB contents. 1237 */ 1238 long kvmhv_do_nested_tlbie(struct kvm_vcpu *vcpu) 1239 { 1240 int ret; 1241 1242 ret = kvmhv_emulate_priv_tlbie(vcpu, kvmppc_get_gpr(vcpu, 4), 1243 kvmppc_get_gpr(vcpu, 5), kvmppc_get_gpr(vcpu, 6)); 1244 if (ret) 1245 return H_PARAMETER; 1246 return H_SUCCESS; 1247 } 1248 1249 static long do_tlb_invalidate_nested_all(struct kvm_vcpu *vcpu, 1250 unsigned long lpid, unsigned long ric) 1251 { 1252 struct kvm *kvm = vcpu->kvm; 1253 struct kvm_nested_guest *gp; 1254 1255 gp = kvmhv_get_nested(kvm, lpid, false); 1256 if (gp) { 1257 kvmhv_emulate_tlbie_lpid(vcpu, gp, ric); 1258 kvmhv_put_nested(gp); 1259 } 1260 return H_SUCCESS; 1261 } 1262 1263 /* 1264 * Number of pages above which we invalidate the entire LPID rather than 1265 * flush individual pages. 1266 */ 1267 static unsigned long tlb_range_flush_page_ceiling __read_mostly = 33; 1268 1269 static long do_tlb_invalidate_nested_tlb(struct kvm_vcpu *vcpu, 1270 unsigned long lpid, 1271 unsigned long pg_sizes, 1272 unsigned long start, 1273 unsigned long end) 1274 { 1275 int ret = H_P4; 1276 unsigned long addr, nr_pages; 1277 struct mmu_psize_def *def; 1278 unsigned long psize, ap, page_size; 1279 bool flush_lpid; 1280 1281 for (psize = 0; psize < MMU_PAGE_COUNT; psize++) { 1282 def = &mmu_psize_defs[psize]; 1283 if (!(pg_sizes & def->h_rpt_pgsize)) 1284 continue; 1285 1286 nr_pages = (end - start) >> def->shift; 1287 flush_lpid = nr_pages > tlb_range_flush_page_ceiling; 1288 if (flush_lpid) 1289 return do_tlb_invalidate_nested_all(vcpu, lpid, 1290 RIC_FLUSH_TLB); 1291 addr = start; 1292 ap = mmu_get_ap(psize); 1293 page_size = 1UL << def->shift; 1294 do { 1295 ret = kvmhv_emulate_tlbie_tlb_addr(vcpu, lpid, ap, 1296 get_epn(addr)); 1297 if (ret) 1298 return H_P4; 1299 addr += page_size; 1300 } while (addr < end); 1301 } 1302 return ret; 1303 } 1304 1305 /* 1306 * Performs partition-scoped invalidations for nested guests 1307 * as part of H_RPT_INVALIDATE hcall. 1308 */ 1309 long do_h_rpt_invalidate_pat(struct kvm_vcpu *vcpu, unsigned long lpid, 1310 unsigned long type, unsigned long pg_sizes, 1311 unsigned long start, unsigned long end) 1312 { 1313 /* 1314 * If L2 lpid isn't valid, we need to return H_PARAMETER. 1315 * 1316 * However, nested KVM issues a L2 lpid flush call when creating 1317 * partition table entries for L2. This happens even before the 1318 * corresponding shadow lpid is created in HV which happens in 1319 * H_ENTER_NESTED call. Since we can't differentiate this case from 1320 * the invalid case, we ignore such flush requests and return success. 1321 */ 1322 if (!__find_nested(vcpu->kvm, lpid)) 1323 return H_SUCCESS; 1324 1325 /* 1326 * A flush all request can be handled by a full lpid flush only. 1327 */ 1328 if ((type & H_RPTI_TYPE_NESTED_ALL) == H_RPTI_TYPE_NESTED_ALL) 1329 return do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_ALL); 1330 1331 /* 1332 * We don't need to handle a PWC flush like process table here, 1333 * because intermediate partition scoped table in nested guest doesn't 1334 * really have PWC. Only level we have PWC is in L0 and for nested 1335 * invalidate at L0 we always do kvm_flush_lpid() which does 1336 * radix__flush_all_lpid(). For range invalidate at any level, we 1337 * are not removing the higher level page tables and hence there is 1338 * no PWC invalidate needed. 1339 * 1340 * if (type & H_RPTI_TYPE_PWC) { 1341 * ret = do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_PWC); 1342 * if (ret) 1343 * return H_P4; 1344 * } 1345 */ 1346 1347 if (start == 0 && end == -1) 1348 return do_tlb_invalidate_nested_all(vcpu, lpid, RIC_FLUSH_TLB); 1349 1350 if (type & H_RPTI_TYPE_TLB) 1351 return do_tlb_invalidate_nested_tlb(vcpu, lpid, pg_sizes, 1352 start, end); 1353 return H_SUCCESS; 1354 } 1355 1356 /* Used to convert a nested guest real address to a L1 guest real address */ 1357 static int kvmhv_translate_addr_nested(struct kvm_vcpu *vcpu, 1358 struct kvm_nested_guest *gp, 1359 unsigned long n_gpa, unsigned long dsisr, 1360 struct kvmppc_pte *gpte_p) 1361 { 1362 u64 fault_addr, flags = dsisr & DSISR_ISSTORE; 1363 int ret; 1364 1365 ret = kvmppc_mmu_walk_radix_tree(vcpu, n_gpa, gpte_p, gp->l1_gr_to_hr, 1366 &fault_addr); 1367 1368 if (ret) { 1369 /* We didn't find a pte */ 1370 if (ret == -EINVAL) { 1371 /* Unsupported mmu config */ 1372 flags |= DSISR_UNSUPP_MMU; 1373 } else if (ret == -ENOENT) { 1374 /* No translation found */ 1375 flags |= DSISR_NOHPTE; 1376 } else if (ret == -EFAULT) { 1377 /* Couldn't access L1 real address */ 1378 flags |= DSISR_PRTABLE_FAULT; 1379 vcpu->arch.fault_gpa = fault_addr; 1380 } else { 1381 /* Unknown error */ 1382 return ret; 1383 } 1384 goto forward_to_l1; 1385 } else { 1386 /* We found a pte -> check permissions */ 1387 if (dsisr & DSISR_ISSTORE) { 1388 /* Can we write? */ 1389 if (!gpte_p->may_write) { 1390 flags |= DSISR_PROTFAULT; 1391 goto forward_to_l1; 1392 } 1393 } else if (vcpu->arch.trap == BOOK3S_INTERRUPT_H_INST_STORAGE) { 1394 /* Can we execute? */ 1395 if (!gpte_p->may_execute) { 1396 flags |= SRR1_ISI_N_G_OR_CIP; 1397 goto forward_to_l1; 1398 } 1399 } else { 1400 /* Can we read? */ 1401 if (!gpte_p->may_read && !gpte_p->may_write) { 1402 flags |= DSISR_PROTFAULT; 1403 goto forward_to_l1; 1404 } 1405 } 1406 } 1407 1408 return 0; 1409 1410 forward_to_l1: 1411 vcpu->arch.fault_dsisr = flags; 1412 if (vcpu->arch.trap == BOOK3S_INTERRUPT_H_INST_STORAGE) { 1413 vcpu->arch.shregs.msr &= SRR1_MSR_BITS; 1414 vcpu->arch.shregs.msr |= flags; 1415 } 1416 return RESUME_HOST; 1417 } 1418 1419 static long kvmhv_handle_nested_set_rc(struct kvm_vcpu *vcpu, 1420 struct kvm_nested_guest *gp, 1421 unsigned long n_gpa, 1422 struct kvmppc_pte gpte, 1423 unsigned long dsisr) 1424 { 1425 struct kvm *kvm = vcpu->kvm; 1426 bool writing = !!(dsisr & DSISR_ISSTORE); 1427 u64 pgflags; 1428 long ret; 1429 1430 /* Are the rc bits set in the L1 partition scoped pte? */ 1431 pgflags = _PAGE_ACCESSED; 1432 if (writing) 1433 pgflags |= _PAGE_DIRTY; 1434 if (pgflags & ~gpte.rc) 1435 return RESUME_HOST; 1436 1437 spin_lock(&kvm->mmu_lock); 1438 /* Set the rc bit in the pte of our (L0) pgtable for the L1 guest */ 1439 ret = kvmppc_hv_handle_set_rc(kvm, false, writing, 1440 gpte.raddr, kvm->arch.lpid); 1441 if (!ret) { 1442 ret = -EINVAL; 1443 goto out_unlock; 1444 } 1445 1446 /* Set the rc bit in the pte of the shadow_pgtable for the nest guest */ 1447 ret = kvmppc_hv_handle_set_rc(kvm, true, writing, 1448 n_gpa, gp->l1_lpid); 1449 if (!ret) 1450 ret = -EINVAL; 1451 else 1452 ret = 0; 1453 1454 out_unlock: 1455 spin_unlock(&kvm->mmu_lock); 1456 return ret; 1457 } 1458 1459 static inline int kvmppc_radix_level_to_shift(int level) 1460 { 1461 switch (level) { 1462 case 2: 1463 return PUD_SHIFT; 1464 case 1: 1465 return PMD_SHIFT; 1466 default: 1467 return PAGE_SHIFT; 1468 } 1469 } 1470 1471 static inline int kvmppc_radix_shift_to_level(int shift) 1472 { 1473 if (shift == PUD_SHIFT) 1474 return 2; 1475 if (shift == PMD_SHIFT) 1476 return 1; 1477 if (shift == PAGE_SHIFT) 1478 return 0; 1479 WARN_ON_ONCE(1); 1480 return 0; 1481 } 1482 1483 /* called with gp->tlb_lock held */ 1484 static long int __kvmhv_nested_page_fault(struct kvm_vcpu *vcpu, 1485 struct kvm_nested_guest *gp) 1486 { 1487 struct kvm *kvm = vcpu->kvm; 1488 struct kvm_memory_slot *memslot; 1489 struct rmap_nested *n_rmap; 1490 struct kvmppc_pte gpte; 1491 pte_t pte, *pte_p; 1492 unsigned long mmu_seq; 1493 unsigned long dsisr = vcpu->arch.fault_dsisr; 1494 unsigned long ea = vcpu->arch.fault_dar; 1495 unsigned long *rmapp; 1496 unsigned long n_gpa, gpa, gfn, perm = 0UL; 1497 unsigned int shift, l1_shift, level; 1498 bool writing = !!(dsisr & DSISR_ISSTORE); 1499 bool kvm_ro = false; 1500 long int ret; 1501 1502 if (!gp->l1_gr_to_hr) { 1503 kvmhv_update_ptbl_cache(gp); 1504 if (!gp->l1_gr_to_hr) 1505 return RESUME_HOST; 1506 } 1507 1508 /* Convert the nested guest real address into a L1 guest real address */ 1509 1510 n_gpa = vcpu->arch.fault_gpa & ~0xF000000000000FFFULL; 1511 if (!(dsisr & DSISR_PRTABLE_FAULT)) 1512 n_gpa |= ea & 0xFFF; 1513 ret = kvmhv_translate_addr_nested(vcpu, gp, n_gpa, dsisr, &gpte); 1514 1515 /* 1516 * If the hardware found a translation but we don't now have a usable 1517 * translation in the l1 partition-scoped tree, remove the shadow pte 1518 * and let the guest retry. 1519 */ 1520 if (ret == RESUME_HOST && 1521 (dsisr & (DSISR_PROTFAULT | DSISR_BADACCESS | DSISR_NOEXEC_OR_G | 1522 DSISR_BAD_COPYPASTE))) 1523 goto inval; 1524 if (ret) 1525 return ret; 1526 1527 /* Failed to set the reference/change bits */ 1528 if (dsisr & DSISR_SET_RC) { 1529 ret = kvmhv_handle_nested_set_rc(vcpu, gp, n_gpa, gpte, dsisr); 1530 if (ret == RESUME_HOST) 1531 return ret; 1532 if (ret) 1533 goto inval; 1534 dsisr &= ~DSISR_SET_RC; 1535 if (!(dsisr & (DSISR_BAD_FAULT_64S | DSISR_NOHPTE | 1536 DSISR_PROTFAULT))) 1537 return RESUME_GUEST; 1538 } 1539 1540 /* 1541 * We took an HISI or HDSI while we were running a nested guest which 1542 * means we have no partition scoped translation for that. This means 1543 * we need to insert a pte for the mapping into our shadow_pgtable. 1544 */ 1545 1546 l1_shift = gpte.page_shift; 1547 if (l1_shift < PAGE_SHIFT) { 1548 /* We don't support l1 using a page size smaller than our own */ 1549 pr_err("KVM: L1 guest page shift (%d) less than our own (%d)\n", 1550 l1_shift, PAGE_SHIFT); 1551 return -EINVAL; 1552 } 1553 gpa = gpte.raddr; 1554 gfn = gpa >> PAGE_SHIFT; 1555 1556 /* 1. Get the corresponding host memslot */ 1557 1558 memslot = gfn_to_memslot(kvm, gfn); 1559 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) { 1560 if (dsisr & (DSISR_PRTABLE_FAULT | DSISR_BADACCESS)) { 1561 /* unusual error -> reflect to the guest as a DSI */ 1562 kvmppc_core_queue_data_storage(vcpu, ea, dsisr); 1563 return RESUME_GUEST; 1564 } 1565 1566 /* passthrough of emulated MMIO case */ 1567 return kvmppc_hv_emulate_mmio(vcpu, gpa, ea, writing); 1568 } 1569 if (memslot->flags & KVM_MEM_READONLY) { 1570 if (writing) { 1571 /* Give the guest a DSI */ 1572 kvmppc_core_queue_data_storage(vcpu, ea, 1573 DSISR_ISSTORE | DSISR_PROTFAULT); 1574 return RESUME_GUEST; 1575 } 1576 kvm_ro = true; 1577 } 1578 1579 /* 2. Find the host pte for this L1 guest real address */ 1580 1581 /* Used to check for invalidations in progress */ 1582 mmu_seq = kvm->mmu_notifier_seq; 1583 smp_rmb(); 1584 1585 /* See if can find translation in our partition scoped tables for L1 */ 1586 pte = __pte(0); 1587 spin_lock(&kvm->mmu_lock); 1588 pte_p = find_kvm_secondary_pte(kvm, gpa, &shift); 1589 if (!shift) 1590 shift = PAGE_SHIFT; 1591 if (pte_p) 1592 pte = *pte_p; 1593 spin_unlock(&kvm->mmu_lock); 1594 1595 if (!pte_present(pte) || (writing && !(pte_val(pte) & _PAGE_WRITE))) { 1596 /* No suitable pte found -> try to insert a mapping */ 1597 ret = kvmppc_book3s_instantiate_page(vcpu, gpa, memslot, 1598 writing, kvm_ro, &pte, &level); 1599 if (ret == -EAGAIN) 1600 return RESUME_GUEST; 1601 else if (ret) 1602 return ret; 1603 shift = kvmppc_radix_level_to_shift(level); 1604 } 1605 /* Align gfn to the start of the page */ 1606 gfn = (gpa & ~((1UL << shift) - 1)) >> PAGE_SHIFT; 1607 1608 /* 3. Compute the pte we need to insert for nest_gpa -> host r_addr */ 1609 1610 /* The permissions is the combination of the host and l1 guest ptes */ 1611 perm |= gpte.may_read ? 0UL : _PAGE_READ; 1612 perm |= gpte.may_write ? 0UL : _PAGE_WRITE; 1613 perm |= gpte.may_execute ? 0UL : _PAGE_EXEC; 1614 /* Only set accessed/dirty (rc) bits if set in host and l1 guest ptes */ 1615 perm |= (gpte.rc & _PAGE_ACCESSED) ? 0UL : _PAGE_ACCESSED; 1616 perm |= ((gpte.rc & _PAGE_DIRTY) && writing) ? 0UL : _PAGE_DIRTY; 1617 pte = __pte(pte_val(pte) & ~perm); 1618 1619 /* What size pte can we insert? */ 1620 if (shift > l1_shift) { 1621 u64 mask; 1622 unsigned int actual_shift = PAGE_SHIFT; 1623 if (PMD_SHIFT < l1_shift) 1624 actual_shift = PMD_SHIFT; 1625 mask = (1UL << shift) - (1UL << actual_shift); 1626 pte = __pte(pte_val(pte) | (gpa & mask)); 1627 shift = actual_shift; 1628 } 1629 level = kvmppc_radix_shift_to_level(shift); 1630 n_gpa &= ~((1UL << shift) - 1); 1631 1632 /* 4. Insert the pte into our shadow_pgtable */ 1633 1634 n_rmap = kzalloc(sizeof(*n_rmap), GFP_KERNEL); 1635 if (!n_rmap) 1636 return RESUME_GUEST; /* Let the guest try again */ 1637 n_rmap->rmap = (n_gpa & RMAP_NESTED_GPA_MASK) | 1638 (((unsigned long) gp->l1_lpid) << RMAP_NESTED_LPID_SHIFT); 1639 rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn]; 1640 ret = kvmppc_create_pte(kvm, gp->shadow_pgtable, pte, n_gpa, level, 1641 mmu_seq, gp->shadow_lpid, rmapp, &n_rmap); 1642 kfree(n_rmap); 1643 if (ret == -EAGAIN) 1644 ret = RESUME_GUEST; /* Let the guest try again */ 1645 1646 return ret; 1647 1648 inval: 1649 kvmhv_invalidate_shadow_pte(vcpu, gp, n_gpa, NULL); 1650 return RESUME_GUEST; 1651 } 1652 1653 long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu) 1654 { 1655 struct kvm_nested_guest *gp = vcpu->arch.nested; 1656 long int ret; 1657 1658 mutex_lock(&gp->tlb_lock); 1659 ret = __kvmhv_nested_page_fault(vcpu, gp); 1660 mutex_unlock(&gp->tlb_lock); 1661 return ret; 1662 } 1663 1664 int kvmhv_nested_next_lpid(struct kvm *kvm, int lpid) 1665 { 1666 int ret = lpid + 1; 1667 1668 spin_lock(&kvm->mmu_lock); 1669 if (!idr_get_next(&kvm->arch.kvm_nested_guest_idr, &ret)) 1670 ret = -1; 1671 spin_unlock(&kvm->mmu_lock); 1672 1673 return ret; 1674 } 1675