1 /* 2 * QEMU emulation of an Intel IOMMU (VT-d) 3 * (DMA Remapping device) 4 * 5 * Copyright (C) 2013 Knut Omang, Oracle <knut.omang@oracle.com> 6 * Copyright (C) 2014 Le Tan, <tamlokveer@gmail.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "qemu/osdep.h" 23 #include "qemu/error-report.h" 24 #include "qemu/main-loop.h" 25 #include "qapi/error.h" 26 #include "hw/sysbus.h" 27 #include "exec/address-spaces.h" 28 #include "intel_iommu_internal.h" 29 #include "hw/pci/pci.h" 30 #include "hw/pci/pci_bus.h" 31 #include "hw/qdev-properties.h" 32 #include "hw/i386/pc.h" 33 #include "hw/i386/apic-msidef.h" 34 #include "hw/boards.h" 35 #include "hw/i386/x86-iommu.h" 36 #include "hw/pci-host/q35.h" 37 #include "sysemu/kvm.h" 38 #include "sysemu/sysemu.h" 39 #include "hw/i386/apic_internal.h" 40 #include "kvm_i386.h" 41 #include "migration/vmstate.h" 42 #include "trace.h" 43 44 /* context entry operations */ 45 #define VTD_CE_GET_RID2PASID(ce) \ 46 ((ce)->val[1] & VTD_SM_CONTEXT_ENTRY_RID2PASID_MASK) 47 #define VTD_CE_GET_PASID_DIR_TABLE(ce) \ 48 ((ce)->val[0] & VTD_PASID_DIR_BASE_ADDR_MASK) 49 50 /* pe operations */ 51 #define VTD_PE_GET_TYPE(pe) ((pe)->val[0] & VTD_SM_PASID_ENTRY_PGTT) 52 #define VTD_PE_GET_LEVEL(pe) (2 + (((pe)->val[0] >> 2) & VTD_SM_PASID_ENTRY_AW)) 53 #define VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write) {\ 54 if (ret_fr) { \ 55 ret_fr = -ret_fr; \ 56 if (is_fpd_set && vtd_is_qualified_fault(ret_fr)) { \ 57 trace_vtd_fault_disabled(); \ 58 } else { \ 59 vtd_report_dmar_fault(s, source_id, addr, ret_fr, is_write); \ 60 } \ 61 goto error; \ 62 } \ 63 } 64 65 static void vtd_address_space_refresh_all(IntelIOMMUState *s); 66 static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n); 67 68 static void vtd_panic_require_caching_mode(void) 69 { 70 error_report("We need to set caching-mode=on for intel-iommu to enable " 71 "device assignment with IOMMU protection."); 72 exit(1); 73 } 74 75 static void vtd_define_quad(IntelIOMMUState *s, hwaddr addr, uint64_t val, 76 uint64_t wmask, uint64_t w1cmask) 77 { 78 stq_le_p(&s->csr[addr], val); 79 stq_le_p(&s->wmask[addr], wmask); 80 stq_le_p(&s->w1cmask[addr], w1cmask); 81 } 82 83 static void vtd_define_quad_wo(IntelIOMMUState *s, hwaddr addr, uint64_t mask) 84 { 85 stq_le_p(&s->womask[addr], mask); 86 } 87 88 static void vtd_define_long(IntelIOMMUState *s, hwaddr addr, uint32_t val, 89 uint32_t wmask, uint32_t w1cmask) 90 { 91 stl_le_p(&s->csr[addr], val); 92 stl_le_p(&s->wmask[addr], wmask); 93 stl_le_p(&s->w1cmask[addr], w1cmask); 94 } 95 96 static void vtd_define_long_wo(IntelIOMMUState *s, hwaddr addr, uint32_t mask) 97 { 98 stl_le_p(&s->womask[addr], mask); 99 } 100 101 /* "External" get/set operations */ 102 static void vtd_set_quad(IntelIOMMUState *s, hwaddr addr, uint64_t val) 103 { 104 uint64_t oldval = ldq_le_p(&s->csr[addr]); 105 uint64_t wmask = ldq_le_p(&s->wmask[addr]); 106 uint64_t w1cmask = ldq_le_p(&s->w1cmask[addr]); 107 stq_le_p(&s->csr[addr], 108 ((oldval & ~wmask) | (val & wmask)) & ~(w1cmask & val)); 109 } 110 111 static void vtd_set_long(IntelIOMMUState *s, hwaddr addr, uint32_t val) 112 { 113 uint32_t oldval = ldl_le_p(&s->csr[addr]); 114 uint32_t wmask = ldl_le_p(&s->wmask[addr]); 115 uint32_t w1cmask = ldl_le_p(&s->w1cmask[addr]); 116 stl_le_p(&s->csr[addr], 117 ((oldval & ~wmask) | (val & wmask)) & ~(w1cmask & val)); 118 } 119 120 static uint64_t vtd_get_quad(IntelIOMMUState *s, hwaddr addr) 121 { 122 uint64_t val = ldq_le_p(&s->csr[addr]); 123 uint64_t womask = ldq_le_p(&s->womask[addr]); 124 return val & ~womask; 125 } 126 127 static uint32_t vtd_get_long(IntelIOMMUState *s, hwaddr addr) 128 { 129 uint32_t val = ldl_le_p(&s->csr[addr]); 130 uint32_t womask = ldl_le_p(&s->womask[addr]); 131 return val & ~womask; 132 } 133 134 /* "Internal" get/set operations */ 135 static uint64_t vtd_get_quad_raw(IntelIOMMUState *s, hwaddr addr) 136 { 137 return ldq_le_p(&s->csr[addr]); 138 } 139 140 static uint32_t vtd_get_long_raw(IntelIOMMUState *s, hwaddr addr) 141 { 142 return ldl_le_p(&s->csr[addr]); 143 } 144 145 static void vtd_set_quad_raw(IntelIOMMUState *s, hwaddr addr, uint64_t val) 146 { 147 stq_le_p(&s->csr[addr], val); 148 } 149 150 static uint32_t vtd_set_clear_mask_long(IntelIOMMUState *s, hwaddr addr, 151 uint32_t clear, uint32_t mask) 152 { 153 uint32_t new_val = (ldl_le_p(&s->csr[addr]) & ~clear) | mask; 154 stl_le_p(&s->csr[addr], new_val); 155 return new_val; 156 } 157 158 static uint64_t vtd_set_clear_mask_quad(IntelIOMMUState *s, hwaddr addr, 159 uint64_t clear, uint64_t mask) 160 { 161 uint64_t new_val = (ldq_le_p(&s->csr[addr]) & ~clear) | mask; 162 stq_le_p(&s->csr[addr], new_val); 163 return new_val; 164 } 165 166 static inline void vtd_iommu_lock(IntelIOMMUState *s) 167 { 168 qemu_mutex_lock(&s->iommu_lock); 169 } 170 171 static inline void vtd_iommu_unlock(IntelIOMMUState *s) 172 { 173 qemu_mutex_unlock(&s->iommu_lock); 174 } 175 176 static void vtd_update_scalable_state(IntelIOMMUState *s) 177 { 178 uint64_t val = vtd_get_quad_raw(s, DMAR_RTADDR_REG); 179 180 if (s->scalable_mode) { 181 s->root_scalable = val & VTD_RTADDR_SMT; 182 } 183 } 184 185 /* Whether the address space needs to notify new mappings */ 186 static inline gboolean vtd_as_has_map_notifier(VTDAddressSpace *as) 187 { 188 return as->notifier_flags & IOMMU_NOTIFIER_MAP; 189 } 190 191 /* GHashTable functions */ 192 static gboolean vtd_uint64_equal(gconstpointer v1, gconstpointer v2) 193 { 194 return *((const uint64_t *)v1) == *((const uint64_t *)v2); 195 } 196 197 static guint vtd_uint64_hash(gconstpointer v) 198 { 199 return (guint)*(const uint64_t *)v; 200 } 201 202 static gboolean vtd_hash_remove_by_domain(gpointer key, gpointer value, 203 gpointer user_data) 204 { 205 VTDIOTLBEntry *entry = (VTDIOTLBEntry *)value; 206 uint16_t domain_id = *(uint16_t *)user_data; 207 return entry->domain_id == domain_id; 208 } 209 210 /* The shift of an addr for a certain level of paging structure */ 211 static inline uint32_t vtd_slpt_level_shift(uint32_t level) 212 { 213 assert(level != 0); 214 return VTD_PAGE_SHIFT_4K + (level - 1) * VTD_SL_LEVEL_BITS; 215 } 216 217 static inline uint64_t vtd_slpt_level_page_mask(uint32_t level) 218 { 219 return ~((1ULL << vtd_slpt_level_shift(level)) - 1); 220 } 221 222 static gboolean vtd_hash_remove_by_page(gpointer key, gpointer value, 223 gpointer user_data) 224 { 225 VTDIOTLBEntry *entry = (VTDIOTLBEntry *)value; 226 VTDIOTLBPageInvInfo *info = (VTDIOTLBPageInvInfo *)user_data; 227 uint64_t gfn = (info->addr >> VTD_PAGE_SHIFT_4K) & info->mask; 228 uint64_t gfn_tlb = (info->addr & entry->mask) >> VTD_PAGE_SHIFT_4K; 229 return (entry->domain_id == info->domain_id) && 230 (((entry->gfn & info->mask) == gfn) || 231 (entry->gfn == gfn_tlb)); 232 } 233 234 /* Reset all the gen of VTDAddressSpace to zero and set the gen of 235 * IntelIOMMUState to 1. Must be called with IOMMU lock held. 236 */ 237 static void vtd_reset_context_cache_locked(IntelIOMMUState *s) 238 { 239 VTDAddressSpace *vtd_as; 240 VTDBus *vtd_bus; 241 GHashTableIter bus_it; 242 uint32_t devfn_it; 243 244 trace_vtd_context_cache_reset(); 245 246 g_hash_table_iter_init(&bus_it, s->vtd_as_by_busptr); 247 248 while (g_hash_table_iter_next (&bus_it, NULL, (void**)&vtd_bus)) { 249 for (devfn_it = 0; devfn_it < PCI_DEVFN_MAX; ++devfn_it) { 250 vtd_as = vtd_bus->dev_as[devfn_it]; 251 if (!vtd_as) { 252 continue; 253 } 254 vtd_as->context_cache_entry.context_cache_gen = 0; 255 } 256 } 257 s->context_cache_gen = 1; 258 } 259 260 /* Must be called with IOMMU lock held. */ 261 static void vtd_reset_iotlb_locked(IntelIOMMUState *s) 262 { 263 assert(s->iotlb); 264 g_hash_table_remove_all(s->iotlb); 265 } 266 267 static void vtd_reset_iotlb(IntelIOMMUState *s) 268 { 269 vtd_iommu_lock(s); 270 vtd_reset_iotlb_locked(s); 271 vtd_iommu_unlock(s); 272 } 273 274 static void vtd_reset_caches(IntelIOMMUState *s) 275 { 276 vtd_iommu_lock(s); 277 vtd_reset_iotlb_locked(s); 278 vtd_reset_context_cache_locked(s); 279 vtd_iommu_unlock(s); 280 } 281 282 static uint64_t vtd_get_iotlb_key(uint64_t gfn, uint16_t source_id, 283 uint32_t level) 284 { 285 return gfn | ((uint64_t)(source_id) << VTD_IOTLB_SID_SHIFT) | 286 ((uint64_t)(level) << VTD_IOTLB_LVL_SHIFT); 287 } 288 289 static uint64_t vtd_get_iotlb_gfn(hwaddr addr, uint32_t level) 290 { 291 return (addr & vtd_slpt_level_page_mask(level)) >> VTD_PAGE_SHIFT_4K; 292 } 293 294 /* Must be called with IOMMU lock held */ 295 static VTDIOTLBEntry *vtd_lookup_iotlb(IntelIOMMUState *s, uint16_t source_id, 296 hwaddr addr) 297 { 298 VTDIOTLBEntry *entry; 299 uint64_t key; 300 int level; 301 302 for (level = VTD_SL_PT_LEVEL; level < VTD_SL_PML4_LEVEL; level++) { 303 key = vtd_get_iotlb_key(vtd_get_iotlb_gfn(addr, level), 304 source_id, level); 305 entry = g_hash_table_lookup(s->iotlb, &key); 306 if (entry) { 307 goto out; 308 } 309 } 310 311 out: 312 return entry; 313 } 314 315 /* Must be with IOMMU lock held */ 316 static void vtd_update_iotlb(IntelIOMMUState *s, uint16_t source_id, 317 uint16_t domain_id, hwaddr addr, uint64_t slpte, 318 uint8_t access_flags, uint32_t level) 319 { 320 VTDIOTLBEntry *entry = g_malloc(sizeof(*entry)); 321 uint64_t *key = g_malloc(sizeof(*key)); 322 uint64_t gfn = vtd_get_iotlb_gfn(addr, level); 323 324 trace_vtd_iotlb_page_update(source_id, addr, slpte, domain_id); 325 if (g_hash_table_size(s->iotlb) >= VTD_IOTLB_MAX_SIZE) { 326 trace_vtd_iotlb_reset("iotlb exceeds size limit"); 327 vtd_reset_iotlb_locked(s); 328 } 329 330 entry->gfn = gfn; 331 entry->domain_id = domain_id; 332 entry->slpte = slpte; 333 entry->access_flags = access_flags; 334 entry->mask = vtd_slpt_level_page_mask(level); 335 *key = vtd_get_iotlb_key(gfn, source_id, level); 336 g_hash_table_replace(s->iotlb, key, entry); 337 } 338 339 /* Given the reg addr of both the message data and address, generate an 340 * interrupt via MSI. 341 */ 342 static void vtd_generate_interrupt(IntelIOMMUState *s, hwaddr mesg_addr_reg, 343 hwaddr mesg_data_reg) 344 { 345 MSIMessage msi; 346 347 assert(mesg_data_reg < DMAR_REG_SIZE); 348 assert(mesg_addr_reg < DMAR_REG_SIZE); 349 350 msi.address = vtd_get_long_raw(s, mesg_addr_reg); 351 msi.data = vtd_get_long_raw(s, mesg_data_reg); 352 353 trace_vtd_irq_generate(msi.address, msi.data); 354 355 apic_get_class()->send_msi(&msi); 356 } 357 358 /* Generate a fault event to software via MSI if conditions are met. 359 * Notice that the value of FSTS_REG being passed to it should be the one 360 * before any update. 361 */ 362 static void vtd_generate_fault_event(IntelIOMMUState *s, uint32_t pre_fsts) 363 { 364 if (pre_fsts & VTD_FSTS_PPF || pre_fsts & VTD_FSTS_PFO || 365 pre_fsts & VTD_FSTS_IQE) { 366 error_report_once("There are previous interrupt conditions " 367 "to be serviced by software, fault event " 368 "is not generated"); 369 return; 370 } 371 vtd_set_clear_mask_long(s, DMAR_FECTL_REG, 0, VTD_FECTL_IP); 372 if (vtd_get_long_raw(s, DMAR_FECTL_REG) & VTD_FECTL_IM) { 373 error_report_once("Interrupt Mask set, irq is not generated"); 374 } else { 375 vtd_generate_interrupt(s, DMAR_FEADDR_REG, DMAR_FEDATA_REG); 376 vtd_set_clear_mask_long(s, DMAR_FECTL_REG, VTD_FECTL_IP, 0); 377 } 378 } 379 380 /* Check if the Fault (F) field of the Fault Recording Register referenced by 381 * @index is Set. 382 */ 383 static bool vtd_is_frcd_set(IntelIOMMUState *s, uint16_t index) 384 { 385 /* Each reg is 128-bit */ 386 hwaddr addr = DMAR_FRCD_REG_OFFSET + (((uint64_t)index) << 4); 387 addr += 8; /* Access the high 64-bit half */ 388 389 assert(index < DMAR_FRCD_REG_NR); 390 391 return vtd_get_quad_raw(s, addr) & VTD_FRCD_F; 392 } 393 394 /* Update the PPF field of Fault Status Register. 395 * Should be called whenever change the F field of any fault recording 396 * registers. 397 */ 398 static void vtd_update_fsts_ppf(IntelIOMMUState *s) 399 { 400 uint32_t i; 401 uint32_t ppf_mask = 0; 402 403 for (i = 0; i < DMAR_FRCD_REG_NR; i++) { 404 if (vtd_is_frcd_set(s, i)) { 405 ppf_mask = VTD_FSTS_PPF; 406 break; 407 } 408 } 409 vtd_set_clear_mask_long(s, DMAR_FSTS_REG, VTD_FSTS_PPF, ppf_mask); 410 trace_vtd_fsts_ppf(!!ppf_mask); 411 } 412 413 static void vtd_set_frcd_and_update_ppf(IntelIOMMUState *s, uint16_t index) 414 { 415 /* Each reg is 128-bit */ 416 hwaddr addr = DMAR_FRCD_REG_OFFSET + (((uint64_t)index) << 4); 417 addr += 8; /* Access the high 64-bit half */ 418 419 assert(index < DMAR_FRCD_REG_NR); 420 421 vtd_set_clear_mask_quad(s, addr, 0, VTD_FRCD_F); 422 vtd_update_fsts_ppf(s); 423 } 424 425 /* Must not update F field now, should be done later */ 426 static void vtd_record_frcd(IntelIOMMUState *s, uint16_t index, 427 uint16_t source_id, hwaddr addr, 428 VTDFaultReason fault, bool is_write) 429 { 430 uint64_t hi = 0, lo; 431 hwaddr frcd_reg_addr = DMAR_FRCD_REG_OFFSET + (((uint64_t)index) << 4); 432 433 assert(index < DMAR_FRCD_REG_NR); 434 435 lo = VTD_FRCD_FI(addr); 436 hi = VTD_FRCD_SID(source_id) | VTD_FRCD_FR(fault); 437 if (!is_write) { 438 hi |= VTD_FRCD_T; 439 } 440 vtd_set_quad_raw(s, frcd_reg_addr, lo); 441 vtd_set_quad_raw(s, frcd_reg_addr + 8, hi); 442 443 trace_vtd_frr_new(index, hi, lo); 444 } 445 446 /* Try to collapse multiple pending faults from the same requester */ 447 static bool vtd_try_collapse_fault(IntelIOMMUState *s, uint16_t source_id) 448 { 449 uint32_t i; 450 uint64_t frcd_reg; 451 hwaddr addr = DMAR_FRCD_REG_OFFSET + 8; /* The high 64-bit half */ 452 453 for (i = 0; i < DMAR_FRCD_REG_NR; i++) { 454 frcd_reg = vtd_get_quad_raw(s, addr); 455 if ((frcd_reg & VTD_FRCD_F) && 456 ((frcd_reg & VTD_FRCD_SID_MASK) == source_id)) { 457 return true; 458 } 459 addr += 16; /* 128-bit for each */ 460 } 461 return false; 462 } 463 464 /* Log and report an DMAR (address translation) fault to software */ 465 static void vtd_report_dmar_fault(IntelIOMMUState *s, uint16_t source_id, 466 hwaddr addr, VTDFaultReason fault, 467 bool is_write) 468 { 469 uint32_t fsts_reg = vtd_get_long_raw(s, DMAR_FSTS_REG); 470 471 assert(fault < VTD_FR_MAX); 472 473 if (fault == VTD_FR_RESERVED_ERR) { 474 /* This is not a normal fault reason case. Drop it. */ 475 return; 476 } 477 478 trace_vtd_dmar_fault(source_id, fault, addr, is_write); 479 480 if (fsts_reg & VTD_FSTS_PFO) { 481 error_report_once("New fault is not recorded due to " 482 "Primary Fault Overflow"); 483 return; 484 } 485 486 if (vtd_try_collapse_fault(s, source_id)) { 487 error_report_once("New fault is not recorded due to " 488 "compression of faults"); 489 return; 490 } 491 492 if (vtd_is_frcd_set(s, s->next_frcd_reg)) { 493 error_report_once("Next Fault Recording Reg is used, " 494 "new fault is not recorded, set PFO field"); 495 vtd_set_clear_mask_long(s, DMAR_FSTS_REG, 0, VTD_FSTS_PFO); 496 return; 497 } 498 499 vtd_record_frcd(s, s->next_frcd_reg, source_id, addr, fault, is_write); 500 501 if (fsts_reg & VTD_FSTS_PPF) { 502 error_report_once("There are pending faults already, " 503 "fault event is not generated"); 504 vtd_set_frcd_and_update_ppf(s, s->next_frcd_reg); 505 s->next_frcd_reg++; 506 if (s->next_frcd_reg == DMAR_FRCD_REG_NR) { 507 s->next_frcd_reg = 0; 508 } 509 } else { 510 vtd_set_clear_mask_long(s, DMAR_FSTS_REG, VTD_FSTS_FRI_MASK, 511 VTD_FSTS_FRI(s->next_frcd_reg)); 512 vtd_set_frcd_and_update_ppf(s, s->next_frcd_reg); /* Will set PPF */ 513 s->next_frcd_reg++; 514 if (s->next_frcd_reg == DMAR_FRCD_REG_NR) { 515 s->next_frcd_reg = 0; 516 } 517 /* This case actually cause the PPF to be Set. 518 * So generate fault event (interrupt). 519 */ 520 vtd_generate_fault_event(s, fsts_reg); 521 } 522 } 523 524 /* Handle Invalidation Queue Errors of queued invalidation interface error 525 * conditions. 526 */ 527 static void vtd_handle_inv_queue_error(IntelIOMMUState *s) 528 { 529 uint32_t fsts_reg = vtd_get_long_raw(s, DMAR_FSTS_REG); 530 531 vtd_set_clear_mask_long(s, DMAR_FSTS_REG, 0, VTD_FSTS_IQE); 532 vtd_generate_fault_event(s, fsts_reg); 533 } 534 535 /* Set the IWC field and try to generate an invalidation completion interrupt */ 536 static void vtd_generate_completion_event(IntelIOMMUState *s) 537 { 538 if (vtd_get_long_raw(s, DMAR_ICS_REG) & VTD_ICS_IWC) { 539 trace_vtd_inv_desc_wait_irq("One pending, skip current"); 540 return; 541 } 542 vtd_set_clear_mask_long(s, DMAR_ICS_REG, 0, VTD_ICS_IWC); 543 vtd_set_clear_mask_long(s, DMAR_IECTL_REG, 0, VTD_IECTL_IP); 544 if (vtd_get_long_raw(s, DMAR_IECTL_REG) & VTD_IECTL_IM) { 545 trace_vtd_inv_desc_wait_irq("IM in IECTL_REG is set, " 546 "new event not generated"); 547 return; 548 } else { 549 /* Generate the interrupt event */ 550 trace_vtd_inv_desc_wait_irq("Generating complete event"); 551 vtd_generate_interrupt(s, DMAR_IEADDR_REG, DMAR_IEDATA_REG); 552 vtd_set_clear_mask_long(s, DMAR_IECTL_REG, VTD_IECTL_IP, 0); 553 } 554 } 555 556 static inline bool vtd_root_entry_present(IntelIOMMUState *s, 557 VTDRootEntry *re, 558 uint8_t devfn) 559 { 560 if (s->root_scalable && devfn > UINT8_MAX / 2) { 561 return re->hi & VTD_ROOT_ENTRY_P; 562 } 563 564 return re->lo & VTD_ROOT_ENTRY_P; 565 } 566 567 static int vtd_get_root_entry(IntelIOMMUState *s, uint8_t index, 568 VTDRootEntry *re) 569 { 570 dma_addr_t addr; 571 572 addr = s->root + index * sizeof(*re); 573 if (dma_memory_read(&address_space_memory, addr, re, sizeof(*re))) { 574 re->lo = 0; 575 return -VTD_FR_ROOT_TABLE_INV; 576 } 577 re->lo = le64_to_cpu(re->lo); 578 re->hi = le64_to_cpu(re->hi); 579 return 0; 580 } 581 582 static inline bool vtd_ce_present(VTDContextEntry *context) 583 { 584 return context->lo & VTD_CONTEXT_ENTRY_P; 585 } 586 587 static int vtd_get_context_entry_from_root(IntelIOMMUState *s, 588 VTDRootEntry *re, 589 uint8_t index, 590 VTDContextEntry *ce) 591 { 592 dma_addr_t addr, ce_size; 593 594 /* we have checked that root entry is present */ 595 ce_size = s->root_scalable ? VTD_CTX_ENTRY_SCALABLE_SIZE : 596 VTD_CTX_ENTRY_LEGACY_SIZE; 597 598 if (s->root_scalable && index > UINT8_MAX / 2) { 599 index = index & (~VTD_DEVFN_CHECK_MASK); 600 addr = re->hi & VTD_ROOT_ENTRY_CTP; 601 } else { 602 addr = re->lo & VTD_ROOT_ENTRY_CTP; 603 } 604 605 addr = addr + index * ce_size; 606 if (dma_memory_read(&address_space_memory, addr, ce, ce_size)) { 607 return -VTD_FR_CONTEXT_TABLE_INV; 608 } 609 610 ce->lo = le64_to_cpu(ce->lo); 611 ce->hi = le64_to_cpu(ce->hi); 612 if (ce_size == VTD_CTX_ENTRY_SCALABLE_SIZE) { 613 ce->val[2] = le64_to_cpu(ce->val[2]); 614 ce->val[3] = le64_to_cpu(ce->val[3]); 615 } 616 return 0; 617 } 618 619 static inline dma_addr_t vtd_ce_get_slpt_base(VTDContextEntry *ce) 620 { 621 return ce->lo & VTD_CONTEXT_ENTRY_SLPTPTR; 622 } 623 624 static inline uint64_t vtd_get_slpte_addr(uint64_t slpte, uint8_t aw) 625 { 626 return slpte & VTD_SL_PT_BASE_ADDR_MASK(aw); 627 } 628 629 /* Whether the pte indicates the address of the page frame */ 630 static inline bool vtd_is_last_slpte(uint64_t slpte, uint32_t level) 631 { 632 return level == VTD_SL_PT_LEVEL || (slpte & VTD_SL_PT_PAGE_SIZE_MASK); 633 } 634 635 /* Get the content of a spte located in @base_addr[@index] */ 636 static uint64_t vtd_get_slpte(dma_addr_t base_addr, uint32_t index) 637 { 638 uint64_t slpte; 639 640 assert(index < VTD_SL_PT_ENTRY_NR); 641 642 if (dma_memory_read(&address_space_memory, 643 base_addr + index * sizeof(slpte), &slpte, 644 sizeof(slpte))) { 645 slpte = (uint64_t)-1; 646 return slpte; 647 } 648 slpte = le64_to_cpu(slpte); 649 return slpte; 650 } 651 652 /* Given an iova and the level of paging structure, return the offset 653 * of current level. 654 */ 655 static inline uint32_t vtd_iova_level_offset(uint64_t iova, uint32_t level) 656 { 657 return (iova >> vtd_slpt_level_shift(level)) & 658 ((1ULL << VTD_SL_LEVEL_BITS) - 1); 659 } 660 661 /* Check Capability Register to see if the @level of page-table is supported */ 662 static inline bool vtd_is_level_supported(IntelIOMMUState *s, uint32_t level) 663 { 664 return VTD_CAP_SAGAW_MASK & s->cap & 665 (1ULL << (level - 2 + VTD_CAP_SAGAW_SHIFT)); 666 } 667 668 /* Return true if check passed, otherwise false */ 669 static inline bool vtd_pe_type_check(X86IOMMUState *x86_iommu, 670 VTDPASIDEntry *pe) 671 { 672 switch (VTD_PE_GET_TYPE(pe)) { 673 case VTD_SM_PASID_ENTRY_FLT: 674 case VTD_SM_PASID_ENTRY_SLT: 675 case VTD_SM_PASID_ENTRY_NESTED: 676 break; 677 case VTD_SM_PASID_ENTRY_PT: 678 if (!x86_iommu->pt_supported) { 679 return false; 680 } 681 break; 682 default: 683 /* Unknwon type */ 684 return false; 685 } 686 return true; 687 } 688 689 static inline bool vtd_pdire_present(VTDPASIDDirEntry *pdire) 690 { 691 return pdire->val & 1; 692 } 693 694 /** 695 * Caller of this function should check present bit if wants 696 * to use pdir entry for futher usage except for fpd bit check. 697 */ 698 static int vtd_get_pdire_from_pdir_table(dma_addr_t pasid_dir_base, 699 uint32_t pasid, 700 VTDPASIDDirEntry *pdire) 701 { 702 uint32_t index; 703 dma_addr_t addr, entry_size; 704 705 index = VTD_PASID_DIR_INDEX(pasid); 706 entry_size = VTD_PASID_DIR_ENTRY_SIZE; 707 addr = pasid_dir_base + index * entry_size; 708 if (dma_memory_read(&address_space_memory, addr, pdire, entry_size)) { 709 return -VTD_FR_PASID_TABLE_INV; 710 } 711 712 return 0; 713 } 714 715 static inline bool vtd_pe_present(VTDPASIDEntry *pe) 716 { 717 return pe->val[0] & VTD_PASID_ENTRY_P; 718 } 719 720 static int vtd_get_pe_in_pasid_leaf_table(IntelIOMMUState *s, 721 uint32_t pasid, 722 dma_addr_t addr, 723 VTDPASIDEntry *pe) 724 { 725 uint32_t index; 726 dma_addr_t entry_size; 727 X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s); 728 729 index = VTD_PASID_TABLE_INDEX(pasid); 730 entry_size = VTD_PASID_ENTRY_SIZE; 731 addr = addr + index * entry_size; 732 if (dma_memory_read(&address_space_memory, addr, pe, entry_size)) { 733 return -VTD_FR_PASID_TABLE_INV; 734 } 735 736 /* Do translation type check */ 737 if (!vtd_pe_type_check(x86_iommu, pe)) { 738 return -VTD_FR_PASID_TABLE_INV; 739 } 740 741 if (!vtd_is_level_supported(s, VTD_PE_GET_LEVEL(pe))) { 742 return -VTD_FR_PASID_TABLE_INV; 743 } 744 745 return 0; 746 } 747 748 /** 749 * Caller of this function should check present bit if wants 750 * to use pasid entry for futher usage except for fpd bit check. 751 */ 752 static int vtd_get_pe_from_pdire(IntelIOMMUState *s, 753 uint32_t pasid, 754 VTDPASIDDirEntry *pdire, 755 VTDPASIDEntry *pe) 756 { 757 dma_addr_t addr = pdire->val & VTD_PASID_TABLE_BASE_ADDR_MASK; 758 759 return vtd_get_pe_in_pasid_leaf_table(s, pasid, addr, pe); 760 } 761 762 /** 763 * This function gets a pasid entry from a specified pasid 764 * table (includes dir and leaf table) with a specified pasid. 765 * Sanity check should be done to ensure return a present 766 * pasid entry to caller. 767 */ 768 static int vtd_get_pe_from_pasid_table(IntelIOMMUState *s, 769 dma_addr_t pasid_dir_base, 770 uint32_t pasid, 771 VTDPASIDEntry *pe) 772 { 773 int ret; 774 VTDPASIDDirEntry pdire; 775 776 ret = vtd_get_pdire_from_pdir_table(pasid_dir_base, 777 pasid, &pdire); 778 if (ret) { 779 return ret; 780 } 781 782 if (!vtd_pdire_present(&pdire)) { 783 return -VTD_FR_PASID_TABLE_INV; 784 } 785 786 ret = vtd_get_pe_from_pdire(s, pasid, &pdire, pe); 787 if (ret) { 788 return ret; 789 } 790 791 if (!vtd_pe_present(pe)) { 792 return -VTD_FR_PASID_TABLE_INV; 793 } 794 795 return 0; 796 } 797 798 static int vtd_ce_get_rid2pasid_entry(IntelIOMMUState *s, 799 VTDContextEntry *ce, 800 VTDPASIDEntry *pe) 801 { 802 uint32_t pasid; 803 dma_addr_t pasid_dir_base; 804 int ret = 0; 805 806 pasid = VTD_CE_GET_RID2PASID(ce); 807 pasid_dir_base = VTD_CE_GET_PASID_DIR_TABLE(ce); 808 ret = vtd_get_pe_from_pasid_table(s, pasid_dir_base, pasid, pe); 809 810 return ret; 811 } 812 813 static int vtd_ce_get_pasid_fpd(IntelIOMMUState *s, 814 VTDContextEntry *ce, 815 bool *pe_fpd_set) 816 { 817 int ret; 818 uint32_t pasid; 819 dma_addr_t pasid_dir_base; 820 VTDPASIDDirEntry pdire; 821 VTDPASIDEntry pe; 822 823 pasid = VTD_CE_GET_RID2PASID(ce); 824 pasid_dir_base = VTD_CE_GET_PASID_DIR_TABLE(ce); 825 826 /* 827 * No present bit check since fpd is meaningful even 828 * if the present bit is clear. 829 */ 830 ret = vtd_get_pdire_from_pdir_table(pasid_dir_base, pasid, &pdire); 831 if (ret) { 832 return ret; 833 } 834 835 if (pdire.val & VTD_PASID_DIR_FPD) { 836 *pe_fpd_set = true; 837 return 0; 838 } 839 840 if (!vtd_pdire_present(&pdire)) { 841 return -VTD_FR_PASID_TABLE_INV; 842 } 843 844 /* 845 * No present bit check since fpd is meaningful even 846 * if the present bit is clear. 847 */ 848 ret = vtd_get_pe_from_pdire(s, pasid, &pdire, &pe); 849 if (ret) { 850 return ret; 851 } 852 853 if (pe.val[0] & VTD_PASID_ENTRY_FPD) { 854 *pe_fpd_set = true; 855 } 856 857 return 0; 858 } 859 860 /* Get the page-table level that hardware should use for the second-level 861 * page-table walk from the Address Width field of context-entry. 862 */ 863 static inline uint32_t vtd_ce_get_level(VTDContextEntry *ce) 864 { 865 return 2 + (ce->hi & VTD_CONTEXT_ENTRY_AW); 866 } 867 868 static uint32_t vtd_get_iova_level(IntelIOMMUState *s, 869 VTDContextEntry *ce) 870 { 871 VTDPASIDEntry pe; 872 873 if (s->root_scalable) { 874 vtd_ce_get_rid2pasid_entry(s, ce, &pe); 875 return VTD_PE_GET_LEVEL(&pe); 876 } 877 878 return vtd_ce_get_level(ce); 879 } 880 881 static inline uint32_t vtd_ce_get_agaw(VTDContextEntry *ce) 882 { 883 return 30 + (ce->hi & VTD_CONTEXT_ENTRY_AW) * 9; 884 } 885 886 static uint32_t vtd_get_iova_agaw(IntelIOMMUState *s, 887 VTDContextEntry *ce) 888 { 889 VTDPASIDEntry pe; 890 891 if (s->root_scalable) { 892 vtd_ce_get_rid2pasid_entry(s, ce, &pe); 893 return 30 + ((pe.val[0] >> 2) & VTD_SM_PASID_ENTRY_AW) * 9; 894 } 895 896 return vtd_ce_get_agaw(ce); 897 } 898 899 static inline uint32_t vtd_ce_get_type(VTDContextEntry *ce) 900 { 901 return ce->lo & VTD_CONTEXT_ENTRY_TT; 902 } 903 904 /* Only for Legacy Mode. Return true if check passed, otherwise false */ 905 static inline bool vtd_ce_type_check(X86IOMMUState *x86_iommu, 906 VTDContextEntry *ce) 907 { 908 switch (vtd_ce_get_type(ce)) { 909 case VTD_CONTEXT_TT_MULTI_LEVEL: 910 /* Always supported */ 911 break; 912 case VTD_CONTEXT_TT_DEV_IOTLB: 913 if (!x86_iommu->dt_supported) { 914 error_report_once("%s: DT specified but not supported", __func__); 915 return false; 916 } 917 break; 918 case VTD_CONTEXT_TT_PASS_THROUGH: 919 if (!x86_iommu->pt_supported) { 920 error_report_once("%s: PT specified but not supported", __func__); 921 return false; 922 } 923 break; 924 default: 925 /* Unknown type */ 926 error_report_once("%s: unknown ce type: %"PRIu32, __func__, 927 vtd_ce_get_type(ce)); 928 return false; 929 } 930 return true; 931 } 932 933 static inline uint64_t vtd_iova_limit(IntelIOMMUState *s, 934 VTDContextEntry *ce, uint8_t aw) 935 { 936 uint32_t ce_agaw = vtd_get_iova_agaw(s, ce); 937 return 1ULL << MIN(ce_agaw, aw); 938 } 939 940 /* Return true if IOVA passes range check, otherwise false. */ 941 static inline bool vtd_iova_range_check(IntelIOMMUState *s, 942 uint64_t iova, VTDContextEntry *ce, 943 uint8_t aw) 944 { 945 /* 946 * Check if @iova is above 2^X-1, where X is the minimum of MGAW 947 * in CAP_REG and AW in context-entry. 948 */ 949 return !(iova & ~(vtd_iova_limit(s, ce, aw) - 1)); 950 } 951 952 static dma_addr_t vtd_get_iova_pgtbl_base(IntelIOMMUState *s, 953 VTDContextEntry *ce) 954 { 955 VTDPASIDEntry pe; 956 957 if (s->root_scalable) { 958 vtd_ce_get_rid2pasid_entry(s, ce, &pe); 959 return pe.val[0] & VTD_SM_PASID_ENTRY_SLPTPTR; 960 } 961 962 return vtd_ce_get_slpt_base(ce); 963 } 964 965 /* 966 * Rsvd field masks for spte: 967 * vtd_spte_rsvd 4k pages 968 * vtd_spte_rsvd_large large pages 969 */ 970 static uint64_t vtd_spte_rsvd[5]; 971 static uint64_t vtd_spte_rsvd_large[5]; 972 973 static bool vtd_slpte_nonzero_rsvd(uint64_t slpte, uint32_t level) 974 { 975 uint64_t rsvd_mask = vtd_spte_rsvd[level]; 976 977 if ((level == VTD_SL_PD_LEVEL || level == VTD_SL_PDP_LEVEL) && 978 (slpte & VTD_SL_PT_PAGE_SIZE_MASK)) { 979 /* large page */ 980 rsvd_mask = vtd_spte_rsvd_large[level]; 981 } 982 983 return slpte & rsvd_mask; 984 } 985 986 /* Find the VTD address space associated with a given bus number */ 987 static VTDBus *vtd_find_as_from_bus_num(IntelIOMMUState *s, uint8_t bus_num) 988 { 989 VTDBus *vtd_bus = s->vtd_as_by_bus_num[bus_num]; 990 if (!vtd_bus) { 991 /* 992 * Iterate over the registered buses to find the one which 993 * currently hold this bus number, and update the bus_num 994 * lookup table: 995 */ 996 GHashTableIter iter; 997 998 g_hash_table_iter_init(&iter, s->vtd_as_by_busptr); 999 while (g_hash_table_iter_next(&iter, NULL, (void **)&vtd_bus)) { 1000 if (pci_bus_num(vtd_bus->bus) == bus_num) { 1001 s->vtd_as_by_bus_num[bus_num] = vtd_bus; 1002 return vtd_bus; 1003 } 1004 } 1005 vtd_bus = NULL; 1006 } 1007 return vtd_bus; 1008 } 1009 1010 /* Given the @iova, get relevant @slptep. @slpte_level will be the last level 1011 * of the translation, can be used for deciding the size of large page. 1012 */ 1013 static int vtd_iova_to_slpte(IntelIOMMUState *s, VTDContextEntry *ce, 1014 uint64_t iova, bool is_write, 1015 uint64_t *slptep, uint32_t *slpte_level, 1016 bool *reads, bool *writes, uint8_t aw_bits) 1017 { 1018 dma_addr_t addr = vtd_get_iova_pgtbl_base(s, ce); 1019 uint32_t level = vtd_get_iova_level(s, ce); 1020 uint32_t offset; 1021 uint64_t slpte; 1022 uint64_t access_right_check; 1023 1024 if (!vtd_iova_range_check(s, iova, ce, aw_bits)) { 1025 error_report_once("%s: detected IOVA overflow (iova=0x%" PRIx64 ")", 1026 __func__, iova); 1027 return -VTD_FR_ADDR_BEYOND_MGAW; 1028 } 1029 1030 /* FIXME: what is the Atomics request here? */ 1031 access_right_check = is_write ? VTD_SL_W : VTD_SL_R; 1032 1033 while (true) { 1034 offset = vtd_iova_level_offset(iova, level); 1035 slpte = vtd_get_slpte(addr, offset); 1036 1037 if (slpte == (uint64_t)-1) { 1038 error_report_once("%s: detected read error on DMAR slpte " 1039 "(iova=0x%" PRIx64 ")", __func__, iova); 1040 if (level == vtd_get_iova_level(s, ce)) { 1041 /* Invalid programming of context-entry */ 1042 return -VTD_FR_CONTEXT_ENTRY_INV; 1043 } else { 1044 return -VTD_FR_PAGING_ENTRY_INV; 1045 } 1046 } 1047 *reads = (*reads) && (slpte & VTD_SL_R); 1048 *writes = (*writes) && (slpte & VTD_SL_W); 1049 if (!(slpte & access_right_check)) { 1050 error_report_once("%s: detected slpte permission error " 1051 "(iova=0x%" PRIx64 ", level=0x%" PRIx32 ", " 1052 "slpte=0x%" PRIx64 ", write=%d)", __func__, 1053 iova, level, slpte, is_write); 1054 return is_write ? -VTD_FR_WRITE : -VTD_FR_READ; 1055 } 1056 if (vtd_slpte_nonzero_rsvd(slpte, level)) { 1057 error_report_once("%s: detected splte reserve non-zero " 1058 "iova=0x%" PRIx64 ", level=0x%" PRIx32 1059 "slpte=0x%" PRIx64 ")", __func__, iova, 1060 level, slpte); 1061 return -VTD_FR_PAGING_ENTRY_RSVD; 1062 } 1063 1064 if (vtd_is_last_slpte(slpte, level)) { 1065 *slptep = slpte; 1066 *slpte_level = level; 1067 return 0; 1068 } 1069 addr = vtd_get_slpte_addr(slpte, aw_bits); 1070 level--; 1071 } 1072 } 1073 1074 typedef int (*vtd_page_walk_hook)(IOMMUTLBEntry *entry, void *private); 1075 1076 /** 1077 * Constant information used during page walking 1078 * 1079 * @hook_fn: hook func to be called when detected page 1080 * @private: private data to be passed into hook func 1081 * @notify_unmap: whether we should notify invalid entries 1082 * @as: VT-d address space of the device 1083 * @aw: maximum address width 1084 * @domain: domain ID of the page walk 1085 */ 1086 typedef struct { 1087 VTDAddressSpace *as; 1088 vtd_page_walk_hook hook_fn; 1089 void *private; 1090 bool notify_unmap; 1091 uint8_t aw; 1092 uint16_t domain_id; 1093 } vtd_page_walk_info; 1094 1095 static int vtd_page_walk_one(IOMMUTLBEntry *entry, vtd_page_walk_info *info) 1096 { 1097 VTDAddressSpace *as = info->as; 1098 vtd_page_walk_hook hook_fn = info->hook_fn; 1099 void *private = info->private; 1100 DMAMap target = { 1101 .iova = entry->iova, 1102 .size = entry->addr_mask, 1103 .translated_addr = entry->translated_addr, 1104 .perm = entry->perm, 1105 }; 1106 DMAMap *mapped = iova_tree_find(as->iova_tree, &target); 1107 1108 if (entry->perm == IOMMU_NONE && !info->notify_unmap) { 1109 trace_vtd_page_walk_one_skip_unmap(entry->iova, entry->addr_mask); 1110 return 0; 1111 } 1112 1113 assert(hook_fn); 1114 1115 /* Update local IOVA mapped ranges */ 1116 if (entry->perm) { 1117 if (mapped) { 1118 /* If it's exactly the same translation, skip */ 1119 if (!memcmp(mapped, &target, sizeof(target))) { 1120 trace_vtd_page_walk_one_skip_map(entry->iova, entry->addr_mask, 1121 entry->translated_addr); 1122 return 0; 1123 } else { 1124 /* 1125 * Translation changed. Normally this should not 1126 * happen, but it can happen when with buggy guest 1127 * OSes. Note that there will be a small window that 1128 * we don't have map at all. But that's the best 1129 * effort we can do. The ideal way to emulate this is 1130 * atomically modify the PTE to follow what has 1131 * changed, but we can't. One example is that vfio 1132 * driver only has VFIO_IOMMU_[UN]MAP_DMA but no 1133 * interface to modify a mapping (meanwhile it seems 1134 * meaningless to even provide one). Anyway, let's 1135 * mark this as a TODO in case one day we'll have 1136 * a better solution. 1137 */ 1138 IOMMUAccessFlags cache_perm = entry->perm; 1139 int ret; 1140 1141 /* Emulate an UNMAP */ 1142 entry->perm = IOMMU_NONE; 1143 trace_vtd_page_walk_one(info->domain_id, 1144 entry->iova, 1145 entry->translated_addr, 1146 entry->addr_mask, 1147 entry->perm); 1148 ret = hook_fn(entry, private); 1149 if (ret) { 1150 return ret; 1151 } 1152 /* Drop any existing mapping */ 1153 iova_tree_remove(as->iova_tree, &target); 1154 /* Recover the correct permission */ 1155 entry->perm = cache_perm; 1156 } 1157 } 1158 iova_tree_insert(as->iova_tree, &target); 1159 } else { 1160 if (!mapped) { 1161 /* Skip since we didn't map this range at all */ 1162 trace_vtd_page_walk_one_skip_unmap(entry->iova, entry->addr_mask); 1163 return 0; 1164 } 1165 iova_tree_remove(as->iova_tree, &target); 1166 } 1167 1168 trace_vtd_page_walk_one(info->domain_id, entry->iova, 1169 entry->translated_addr, entry->addr_mask, 1170 entry->perm); 1171 return hook_fn(entry, private); 1172 } 1173 1174 /** 1175 * vtd_page_walk_level - walk over specific level for IOVA range 1176 * 1177 * @addr: base GPA addr to start the walk 1178 * @start: IOVA range start address 1179 * @end: IOVA range end address (start <= addr < end) 1180 * @read: whether parent level has read permission 1181 * @write: whether parent level has write permission 1182 * @info: constant information for the page walk 1183 */ 1184 static int vtd_page_walk_level(dma_addr_t addr, uint64_t start, 1185 uint64_t end, uint32_t level, bool read, 1186 bool write, vtd_page_walk_info *info) 1187 { 1188 bool read_cur, write_cur, entry_valid; 1189 uint32_t offset; 1190 uint64_t slpte; 1191 uint64_t subpage_size, subpage_mask; 1192 IOMMUTLBEntry entry; 1193 uint64_t iova = start; 1194 uint64_t iova_next; 1195 int ret = 0; 1196 1197 trace_vtd_page_walk_level(addr, level, start, end); 1198 1199 subpage_size = 1ULL << vtd_slpt_level_shift(level); 1200 subpage_mask = vtd_slpt_level_page_mask(level); 1201 1202 while (iova < end) { 1203 iova_next = (iova & subpage_mask) + subpage_size; 1204 1205 offset = vtd_iova_level_offset(iova, level); 1206 slpte = vtd_get_slpte(addr, offset); 1207 1208 if (slpte == (uint64_t)-1) { 1209 trace_vtd_page_walk_skip_read(iova, iova_next); 1210 goto next; 1211 } 1212 1213 if (vtd_slpte_nonzero_rsvd(slpte, level)) { 1214 trace_vtd_page_walk_skip_reserve(iova, iova_next); 1215 goto next; 1216 } 1217 1218 /* Permissions are stacked with parents' */ 1219 read_cur = read && (slpte & VTD_SL_R); 1220 write_cur = write && (slpte & VTD_SL_W); 1221 1222 /* 1223 * As long as we have either read/write permission, this is a 1224 * valid entry. The rule works for both page entries and page 1225 * table entries. 1226 */ 1227 entry_valid = read_cur | write_cur; 1228 1229 if (!vtd_is_last_slpte(slpte, level) && entry_valid) { 1230 /* 1231 * This is a valid PDE (or even bigger than PDE). We need 1232 * to walk one further level. 1233 */ 1234 ret = vtd_page_walk_level(vtd_get_slpte_addr(slpte, info->aw), 1235 iova, MIN(iova_next, end), level - 1, 1236 read_cur, write_cur, info); 1237 } else { 1238 /* 1239 * This means we are either: 1240 * 1241 * (1) the real page entry (either 4K page, or huge page) 1242 * (2) the whole range is invalid 1243 * 1244 * In either case, we send an IOTLB notification down. 1245 */ 1246 entry.target_as = &address_space_memory; 1247 entry.iova = iova & subpage_mask; 1248 entry.perm = IOMMU_ACCESS_FLAG(read_cur, write_cur); 1249 entry.addr_mask = ~subpage_mask; 1250 /* NOTE: this is only meaningful if entry_valid == true */ 1251 entry.translated_addr = vtd_get_slpte_addr(slpte, info->aw); 1252 ret = vtd_page_walk_one(&entry, info); 1253 } 1254 1255 if (ret < 0) { 1256 return ret; 1257 } 1258 1259 next: 1260 iova = iova_next; 1261 } 1262 1263 return 0; 1264 } 1265 1266 /** 1267 * vtd_page_walk - walk specific IOVA range, and call the hook 1268 * 1269 * @s: intel iommu state 1270 * @ce: context entry to walk upon 1271 * @start: IOVA address to start the walk 1272 * @end: IOVA range end address (start <= addr < end) 1273 * @info: page walking information struct 1274 */ 1275 static int vtd_page_walk(IntelIOMMUState *s, VTDContextEntry *ce, 1276 uint64_t start, uint64_t end, 1277 vtd_page_walk_info *info) 1278 { 1279 dma_addr_t addr = vtd_get_iova_pgtbl_base(s, ce); 1280 uint32_t level = vtd_get_iova_level(s, ce); 1281 1282 if (!vtd_iova_range_check(s, start, ce, info->aw)) { 1283 return -VTD_FR_ADDR_BEYOND_MGAW; 1284 } 1285 1286 if (!vtd_iova_range_check(s, end, ce, info->aw)) { 1287 /* Fix end so that it reaches the maximum */ 1288 end = vtd_iova_limit(s, ce, info->aw); 1289 } 1290 1291 return vtd_page_walk_level(addr, start, end, level, true, true, info); 1292 } 1293 1294 static int vtd_root_entry_rsvd_bits_check(IntelIOMMUState *s, 1295 VTDRootEntry *re) 1296 { 1297 /* Legacy Mode reserved bits check */ 1298 if (!s->root_scalable && 1299 (re->hi || (re->lo & VTD_ROOT_ENTRY_RSVD(s->aw_bits)))) 1300 goto rsvd_err; 1301 1302 /* Scalable Mode reserved bits check */ 1303 if (s->root_scalable && 1304 ((re->lo & VTD_ROOT_ENTRY_RSVD(s->aw_bits)) || 1305 (re->hi & VTD_ROOT_ENTRY_RSVD(s->aw_bits)))) 1306 goto rsvd_err; 1307 1308 return 0; 1309 1310 rsvd_err: 1311 error_report_once("%s: invalid root entry: hi=0x%"PRIx64 1312 ", lo=0x%"PRIx64, 1313 __func__, re->hi, re->lo); 1314 return -VTD_FR_ROOT_ENTRY_RSVD; 1315 } 1316 1317 static inline int vtd_context_entry_rsvd_bits_check(IntelIOMMUState *s, 1318 VTDContextEntry *ce) 1319 { 1320 if (!s->root_scalable && 1321 (ce->hi & VTD_CONTEXT_ENTRY_RSVD_HI || 1322 ce->lo & VTD_CONTEXT_ENTRY_RSVD_LO(s->aw_bits))) { 1323 error_report_once("%s: invalid context entry: hi=%"PRIx64 1324 ", lo=%"PRIx64" (reserved nonzero)", 1325 __func__, ce->hi, ce->lo); 1326 return -VTD_FR_CONTEXT_ENTRY_RSVD; 1327 } 1328 1329 if (s->root_scalable && 1330 (ce->val[0] & VTD_SM_CONTEXT_ENTRY_RSVD_VAL0(s->aw_bits) || 1331 ce->val[1] & VTD_SM_CONTEXT_ENTRY_RSVD_VAL1 || 1332 ce->val[2] || 1333 ce->val[3])) { 1334 error_report_once("%s: invalid context entry: val[3]=%"PRIx64 1335 ", val[2]=%"PRIx64 1336 ", val[1]=%"PRIx64 1337 ", val[0]=%"PRIx64" (reserved nonzero)", 1338 __func__, ce->val[3], ce->val[2], 1339 ce->val[1], ce->val[0]); 1340 return -VTD_FR_CONTEXT_ENTRY_RSVD; 1341 } 1342 1343 return 0; 1344 } 1345 1346 static int vtd_ce_rid2pasid_check(IntelIOMMUState *s, 1347 VTDContextEntry *ce) 1348 { 1349 VTDPASIDEntry pe; 1350 1351 /* 1352 * Make sure in Scalable Mode, a present context entry 1353 * has valid rid2pasid setting, which includes valid 1354 * rid2pasid field and corresponding pasid entry setting 1355 */ 1356 return vtd_ce_get_rid2pasid_entry(s, ce, &pe); 1357 } 1358 1359 /* Map a device to its corresponding domain (context-entry) */ 1360 static int vtd_dev_to_context_entry(IntelIOMMUState *s, uint8_t bus_num, 1361 uint8_t devfn, VTDContextEntry *ce) 1362 { 1363 VTDRootEntry re; 1364 int ret_fr; 1365 X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s); 1366 1367 ret_fr = vtd_get_root_entry(s, bus_num, &re); 1368 if (ret_fr) { 1369 return ret_fr; 1370 } 1371 1372 if (!vtd_root_entry_present(s, &re, devfn)) { 1373 /* Not error - it's okay we don't have root entry. */ 1374 trace_vtd_re_not_present(bus_num); 1375 return -VTD_FR_ROOT_ENTRY_P; 1376 } 1377 1378 ret_fr = vtd_root_entry_rsvd_bits_check(s, &re); 1379 if (ret_fr) { 1380 return ret_fr; 1381 } 1382 1383 ret_fr = vtd_get_context_entry_from_root(s, &re, devfn, ce); 1384 if (ret_fr) { 1385 return ret_fr; 1386 } 1387 1388 if (!vtd_ce_present(ce)) { 1389 /* Not error - it's okay we don't have context entry. */ 1390 trace_vtd_ce_not_present(bus_num, devfn); 1391 return -VTD_FR_CONTEXT_ENTRY_P; 1392 } 1393 1394 ret_fr = vtd_context_entry_rsvd_bits_check(s, ce); 1395 if (ret_fr) { 1396 return ret_fr; 1397 } 1398 1399 /* Check if the programming of context-entry is valid */ 1400 if (!s->root_scalable && 1401 !vtd_is_level_supported(s, vtd_ce_get_level(ce))) { 1402 error_report_once("%s: invalid context entry: hi=%"PRIx64 1403 ", lo=%"PRIx64" (level %d not supported)", 1404 __func__, ce->hi, ce->lo, 1405 vtd_ce_get_level(ce)); 1406 return -VTD_FR_CONTEXT_ENTRY_INV; 1407 } 1408 1409 if (!s->root_scalable) { 1410 /* Do translation type check */ 1411 if (!vtd_ce_type_check(x86_iommu, ce)) { 1412 /* Errors dumped in vtd_ce_type_check() */ 1413 return -VTD_FR_CONTEXT_ENTRY_INV; 1414 } 1415 } else { 1416 /* 1417 * Check if the programming of context-entry.rid2pasid 1418 * and corresponding pasid setting is valid, and thus 1419 * avoids to check pasid entry fetching result in future 1420 * helper function calling. 1421 */ 1422 ret_fr = vtd_ce_rid2pasid_check(s, ce); 1423 if (ret_fr) { 1424 return ret_fr; 1425 } 1426 } 1427 1428 return 0; 1429 } 1430 1431 static int vtd_sync_shadow_page_hook(IOMMUTLBEntry *entry, 1432 void *private) 1433 { 1434 memory_region_notify_iommu((IOMMUMemoryRegion *)private, 0, *entry); 1435 return 0; 1436 } 1437 1438 static uint16_t vtd_get_domain_id(IntelIOMMUState *s, 1439 VTDContextEntry *ce) 1440 { 1441 VTDPASIDEntry pe; 1442 1443 if (s->root_scalable) { 1444 vtd_ce_get_rid2pasid_entry(s, ce, &pe); 1445 return VTD_SM_PASID_ENTRY_DID(pe.val[1]); 1446 } 1447 1448 return VTD_CONTEXT_ENTRY_DID(ce->hi); 1449 } 1450 1451 static int vtd_sync_shadow_page_table_range(VTDAddressSpace *vtd_as, 1452 VTDContextEntry *ce, 1453 hwaddr addr, hwaddr size) 1454 { 1455 IntelIOMMUState *s = vtd_as->iommu_state; 1456 vtd_page_walk_info info = { 1457 .hook_fn = vtd_sync_shadow_page_hook, 1458 .private = (void *)&vtd_as->iommu, 1459 .notify_unmap = true, 1460 .aw = s->aw_bits, 1461 .as = vtd_as, 1462 .domain_id = vtd_get_domain_id(s, ce), 1463 }; 1464 1465 return vtd_page_walk(s, ce, addr, addr + size, &info); 1466 } 1467 1468 static int vtd_sync_shadow_page_table(VTDAddressSpace *vtd_as) 1469 { 1470 int ret; 1471 VTDContextEntry ce; 1472 IOMMUNotifier *n; 1473 1474 ret = vtd_dev_to_context_entry(vtd_as->iommu_state, 1475 pci_bus_num(vtd_as->bus), 1476 vtd_as->devfn, &ce); 1477 if (ret) { 1478 if (ret == -VTD_FR_CONTEXT_ENTRY_P) { 1479 /* 1480 * It's a valid scenario to have a context entry that is 1481 * not present. For example, when a device is removed 1482 * from an existing domain then the context entry will be 1483 * zeroed by the guest before it was put into another 1484 * domain. When this happens, instead of synchronizing 1485 * the shadow pages we should invalidate all existing 1486 * mappings and notify the backends. 1487 */ 1488 IOMMU_NOTIFIER_FOREACH(n, &vtd_as->iommu) { 1489 vtd_address_space_unmap(vtd_as, n); 1490 } 1491 ret = 0; 1492 } 1493 return ret; 1494 } 1495 1496 return vtd_sync_shadow_page_table_range(vtd_as, &ce, 0, UINT64_MAX); 1497 } 1498 1499 /* 1500 * Check if specific device is configed to bypass address 1501 * translation for DMA requests. In Scalable Mode, bypass 1502 * 1st-level translation or 2nd-level translation, it depends 1503 * on PGTT setting. 1504 */ 1505 static bool vtd_dev_pt_enabled(VTDAddressSpace *as) 1506 { 1507 IntelIOMMUState *s; 1508 VTDContextEntry ce; 1509 VTDPASIDEntry pe; 1510 int ret; 1511 1512 assert(as); 1513 1514 s = as->iommu_state; 1515 ret = vtd_dev_to_context_entry(s, pci_bus_num(as->bus), 1516 as->devfn, &ce); 1517 if (ret) { 1518 /* 1519 * Possibly failed to parse the context entry for some reason 1520 * (e.g., during init, or any guest configuration errors on 1521 * context entries). We should assume PT not enabled for 1522 * safety. 1523 */ 1524 return false; 1525 } 1526 1527 if (s->root_scalable) { 1528 ret = vtd_ce_get_rid2pasid_entry(s, &ce, &pe); 1529 if (ret) { 1530 error_report_once("%s: vtd_ce_get_rid2pasid_entry error: %"PRId32, 1531 __func__, ret); 1532 return false; 1533 } 1534 return (VTD_PE_GET_TYPE(&pe) == VTD_SM_PASID_ENTRY_PT); 1535 } 1536 1537 return (vtd_ce_get_type(&ce) == VTD_CONTEXT_TT_PASS_THROUGH); 1538 } 1539 1540 /* Return whether the device is using IOMMU translation. */ 1541 static bool vtd_switch_address_space(VTDAddressSpace *as) 1542 { 1543 bool use_iommu; 1544 /* Whether we need to take the BQL on our own */ 1545 bool take_bql = !qemu_mutex_iothread_locked(); 1546 1547 assert(as); 1548 1549 use_iommu = as->iommu_state->dmar_enabled && !vtd_dev_pt_enabled(as); 1550 1551 trace_vtd_switch_address_space(pci_bus_num(as->bus), 1552 VTD_PCI_SLOT(as->devfn), 1553 VTD_PCI_FUNC(as->devfn), 1554 use_iommu); 1555 1556 /* 1557 * It's possible that we reach here without BQL, e.g., when called 1558 * from vtd_pt_enable_fast_path(). However the memory APIs need 1559 * it. We'd better make sure we have had it already, or, take it. 1560 */ 1561 if (take_bql) { 1562 qemu_mutex_lock_iothread(); 1563 } 1564 1565 /* Turn off first then on the other */ 1566 if (use_iommu) { 1567 memory_region_set_enabled(&as->nodmar, false); 1568 memory_region_set_enabled(MEMORY_REGION(&as->iommu), true); 1569 } else { 1570 memory_region_set_enabled(MEMORY_REGION(&as->iommu), false); 1571 memory_region_set_enabled(&as->nodmar, true); 1572 } 1573 1574 if (take_bql) { 1575 qemu_mutex_unlock_iothread(); 1576 } 1577 1578 return use_iommu; 1579 } 1580 1581 static void vtd_switch_address_space_all(IntelIOMMUState *s) 1582 { 1583 GHashTableIter iter; 1584 VTDBus *vtd_bus; 1585 int i; 1586 1587 g_hash_table_iter_init(&iter, s->vtd_as_by_busptr); 1588 while (g_hash_table_iter_next(&iter, NULL, (void **)&vtd_bus)) { 1589 for (i = 0; i < PCI_DEVFN_MAX; i++) { 1590 if (!vtd_bus->dev_as[i]) { 1591 continue; 1592 } 1593 vtd_switch_address_space(vtd_bus->dev_as[i]); 1594 } 1595 } 1596 } 1597 1598 static inline uint16_t vtd_make_source_id(uint8_t bus_num, uint8_t devfn) 1599 { 1600 return ((bus_num & 0xffUL) << 8) | (devfn & 0xffUL); 1601 } 1602 1603 static const bool vtd_qualified_faults[] = { 1604 [VTD_FR_RESERVED] = false, 1605 [VTD_FR_ROOT_ENTRY_P] = false, 1606 [VTD_FR_CONTEXT_ENTRY_P] = true, 1607 [VTD_FR_CONTEXT_ENTRY_INV] = true, 1608 [VTD_FR_ADDR_BEYOND_MGAW] = true, 1609 [VTD_FR_WRITE] = true, 1610 [VTD_FR_READ] = true, 1611 [VTD_FR_PAGING_ENTRY_INV] = true, 1612 [VTD_FR_ROOT_TABLE_INV] = false, 1613 [VTD_FR_CONTEXT_TABLE_INV] = false, 1614 [VTD_FR_ROOT_ENTRY_RSVD] = false, 1615 [VTD_FR_PAGING_ENTRY_RSVD] = true, 1616 [VTD_FR_CONTEXT_ENTRY_TT] = true, 1617 [VTD_FR_PASID_TABLE_INV] = false, 1618 [VTD_FR_RESERVED_ERR] = false, 1619 [VTD_FR_MAX] = false, 1620 }; 1621 1622 /* To see if a fault condition is "qualified", which is reported to software 1623 * only if the FPD field in the context-entry used to process the faulting 1624 * request is 0. 1625 */ 1626 static inline bool vtd_is_qualified_fault(VTDFaultReason fault) 1627 { 1628 return vtd_qualified_faults[fault]; 1629 } 1630 1631 static inline bool vtd_is_interrupt_addr(hwaddr addr) 1632 { 1633 return VTD_INTERRUPT_ADDR_FIRST <= addr && addr <= VTD_INTERRUPT_ADDR_LAST; 1634 } 1635 1636 static void vtd_pt_enable_fast_path(IntelIOMMUState *s, uint16_t source_id) 1637 { 1638 VTDBus *vtd_bus; 1639 VTDAddressSpace *vtd_as; 1640 bool success = false; 1641 1642 vtd_bus = vtd_find_as_from_bus_num(s, VTD_SID_TO_BUS(source_id)); 1643 if (!vtd_bus) { 1644 goto out; 1645 } 1646 1647 vtd_as = vtd_bus->dev_as[VTD_SID_TO_DEVFN(source_id)]; 1648 if (!vtd_as) { 1649 goto out; 1650 } 1651 1652 if (vtd_switch_address_space(vtd_as) == false) { 1653 /* We switched off IOMMU region successfully. */ 1654 success = true; 1655 } 1656 1657 out: 1658 trace_vtd_pt_enable_fast_path(source_id, success); 1659 } 1660 1661 /* Map dev to context-entry then do a paging-structures walk to do a iommu 1662 * translation. 1663 * 1664 * Called from RCU critical section. 1665 * 1666 * @bus_num: The bus number 1667 * @devfn: The devfn, which is the combined of device and function number 1668 * @is_write: The access is a write operation 1669 * @entry: IOMMUTLBEntry that contain the addr to be translated and result 1670 * 1671 * Returns true if translation is successful, otherwise false. 1672 */ 1673 static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus, 1674 uint8_t devfn, hwaddr addr, bool is_write, 1675 IOMMUTLBEntry *entry) 1676 { 1677 IntelIOMMUState *s = vtd_as->iommu_state; 1678 VTDContextEntry ce; 1679 uint8_t bus_num = pci_bus_num(bus); 1680 VTDContextCacheEntry *cc_entry; 1681 uint64_t slpte, page_mask; 1682 uint32_t level; 1683 uint16_t source_id = vtd_make_source_id(bus_num, devfn); 1684 int ret_fr; 1685 bool is_fpd_set = false; 1686 bool reads = true; 1687 bool writes = true; 1688 uint8_t access_flags; 1689 VTDIOTLBEntry *iotlb_entry; 1690 1691 /* 1692 * We have standalone memory region for interrupt addresses, we 1693 * should never receive translation requests in this region. 1694 */ 1695 assert(!vtd_is_interrupt_addr(addr)); 1696 1697 vtd_iommu_lock(s); 1698 1699 cc_entry = &vtd_as->context_cache_entry; 1700 1701 /* Try to fetch slpte form IOTLB */ 1702 iotlb_entry = vtd_lookup_iotlb(s, source_id, addr); 1703 if (iotlb_entry) { 1704 trace_vtd_iotlb_page_hit(source_id, addr, iotlb_entry->slpte, 1705 iotlb_entry->domain_id); 1706 slpte = iotlb_entry->slpte; 1707 access_flags = iotlb_entry->access_flags; 1708 page_mask = iotlb_entry->mask; 1709 goto out; 1710 } 1711 1712 /* Try to fetch context-entry from cache first */ 1713 if (cc_entry->context_cache_gen == s->context_cache_gen) { 1714 trace_vtd_iotlb_cc_hit(bus_num, devfn, cc_entry->context_entry.hi, 1715 cc_entry->context_entry.lo, 1716 cc_entry->context_cache_gen); 1717 ce = cc_entry->context_entry; 1718 is_fpd_set = ce.lo & VTD_CONTEXT_ENTRY_FPD; 1719 if (!is_fpd_set && s->root_scalable) { 1720 ret_fr = vtd_ce_get_pasid_fpd(s, &ce, &is_fpd_set); 1721 VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write); 1722 } 1723 } else { 1724 ret_fr = vtd_dev_to_context_entry(s, bus_num, devfn, &ce); 1725 is_fpd_set = ce.lo & VTD_CONTEXT_ENTRY_FPD; 1726 if (!ret_fr && !is_fpd_set && s->root_scalable) { 1727 ret_fr = vtd_ce_get_pasid_fpd(s, &ce, &is_fpd_set); 1728 } 1729 VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write); 1730 /* Update context-cache */ 1731 trace_vtd_iotlb_cc_update(bus_num, devfn, ce.hi, ce.lo, 1732 cc_entry->context_cache_gen, 1733 s->context_cache_gen); 1734 cc_entry->context_entry = ce; 1735 cc_entry->context_cache_gen = s->context_cache_gen; 1736 } 1737 1738 /* 1739 * We don't need to translate for pass-through context entries. 1740 * Also, let's ignore IOTLB caching as well for PT devices. 1741 */ 1742 if (vtd_ce_get_type(&ce) == VTD_CONTEXT_TT_PASS_THROUGH) { 1743 entry->iova = addr & VTD_PAGE_MASK_4K; 1744 entry->translated_addr = entry->iova; 1745 entry->addr_mask = ~VTD_PAGE_MASK_4K; 1746 entry->perm = IOMMU_RW; 1747 trace_vtd_translate_pt(source_id, entry->iova); 1748 1749 /* 1750 * When this happens, it means firstly caching-mode is not 1751 * enabled, and this is the first passthrough translation for 1752 * the device. Let's enable the fast path for passthrough. 1753 * 1754 * When passthrough is disabled again for the device, we can 1755 * capture it via the context entry invalidation, then the 1756 * IOMMU region can be swapped back. 1757 */ 1758 vtd_pt_enable_fast_path(s, source_id); 1759 vtd_iommu_unlock(s); 1760 return true; 1761 } 1762 1763 ret_fr = vtd_iova_to_slpte(s, &ce, addr, is_write, &slpte, &level, 1764 &reads, &writes, s->aw_bits); 1765 VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write); 1766 1767 page_mask = vtd_slpt_level_page_mask(level); 1768 access_flags = IOMMU_ACCESS_FLAG(reads, writes); 1769 vtd_update_iotlb(s, source_id, vtd_get_domain_id(s, &ce), addr, slpte, 1770 access_flags, level); 1771 out: 1772 vtd_iommu_unlock(s); 1773 entry->iova = addr & page_mask; 1774 entry->translated_addr = vtd_get_slpte_addr(slpte, s->aw_bits) & page_mask; 1775 entry->addr_mask = ~page_mask; 1776 entry->perm = access_flags; 1777 return true; 1778 1779 error: 1780 vtd_iommu_unlock(s); 1781 entry->iova = 0; 1782 entry->translated_addr = 0; 1783 entry->addr_mask = 0; 1784 entry->perm = IOMMU_NONE; 1785 return false; 1786 } 1787 1788 static void vtd_root_table_setup(IntelIOMMUState *s) 1789 { 1790 s->root = vtd_get_quad_raw(s, DMAR_RTADDR_REG); 1791 s->root &= VTD_RTADDR_ADDR_MASK(s->aw_bits); 1792 1793 vtd_update_scalable_state(s); 1794 1795 trace_vtd_reg_dmar_root(s->root, s->root_scalable); 1796 } 1797 1798 static void vtd_iec_notify_all(IntelIOMMUState *s, bool global, 1799 uint32_t index, uint32_t mask) 1800 { 1801 x86_iommu_iec_notify_all(X86_IOMMU_DEVICE(s), global, index, mask); 1802 } 1803 1804 static void vtd_interrupt_remap_table_setup(IntelIOMMUState *s) 1805 { 1806 uint64_t value = 0; 1807 value = vtd_get_quad_raw(s, DMAR_IRTA_REG); 1808 s->intr_size = 1UL << ((value & VTD_IRTA_SIZE_MASK) + 1); 1809 s->intr_root = value & VTD_IRTA_ADDR_MASK(s->aw_bits); 1810 s->intr_eime = value & VTD_IRTA_EIME; 1811 1812 /* Notify global invalidation */ 1813 vtd_iec_notify_all(s, true, 0, 0); 1814 1815 trace_vtd_reg_ir_root(s->intr_root, s->intr_size); 1816 } 1817 1818 static void vtd_iommu_replay_all(IntelIOMMUState *s) 1819 { 1820 VTDAddressSpace *vtd_as; 1821 1822 QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) { 1823 vtd_sync_shadow_page_table(vtd_as); 1824 } 1825 } 1826 1827 static void vtd_context_global_invalidate(IntelIOMMUState *s) 1828 { 1829 trace_vtd_inv_desc_cc_global(); 1830 /* Protects context cache */ 1831 vtd_iommu_lock(s); 1832 s->context_cache_gen++; 1833 if (s->context_cache_gen == VTD_CONTEXT_CACHE_GEN_MAX) { 1834 vtd_reset_context_cache_locked(s); 1835 } 1836 vtd_iommu_unlock(s); 1837 vtd_address_space_refresh_all(s); 1838 /* 1839 * From VT-d spec 6.5.2.1, a global context entry invalidation 1840 * should be followed by a IOTLB global invalidation, so we should 1841 * be safe even without this. Hoewever, let's replay the region as 1842 * well to be safer, and go back here when we need finer tunes for 1843 * VT-d emulation codes. 1844 */ 1845 vtd_iommu_replay_all(s); 1846 } 1847 1848 /* Do a context-cache device-selective invalidation. 1849 * @func_mask: FM field after shifting 1850 */ 1851 static void vtd_context_device_invalidate(IntelIOMMUState *s, 1852 uint16_t source_id, 1853 uint16_t func_mask) 1854 { 1855 uint16_t mask; 1856 VTDBus *vtd_bus; 1857 VTDAddressSpace *vtd_as; 1858 uint8_t bus_n, devfn; 1859 uint16_t devfn_it; 1860 1861 trace_vtd_inv_desc_cc_devices(source_id, func_mask); 1862 1863 switch (func_mask & 3) { 1864 case 0: 1865 mask = 0; /* No bits in the SID field masked */ 1866 break; 1867 case 1: 1868 mask = 4; /* Mask bit 2 in the SID field */ 1869 break; 1870 case 2: 1871 mask = 6; /* Mask bit 2:1 in the SID field */ 1872 break; 1873 case 3: 1874 mask = 7; /* Mask bit 2:0 in the SID field */ 1875 break; 1876 } 1877 mask = ~mask; 1878 1879 bus_n = VTD_SID_TO_BUS(source_id); 1880 vtd_bus = vtd_find_as_from_bus_num(s, bus_n); 1881 if (vtd_bus) { 1882 devfn = VTD_SID_TO_DEVFN(source_id); 1883 for (devfn_it = 0; devfn_it < PCI_DEVFN_MAX; ++devfn_it) { 1884 vtd_as = vtd_bus->dev_as[devfn_it]; 1885 if (vtd_as && ((devfn_it & mask) == (devfn & mask))) { 1886 trace_vtd_inv_desc_cc_device(bus_n, VTD_PCI_SLOT(devfn_it), 1887 VTD_PCI_FUNC(devfn_it)); 1888 vtd_iommu_lock(s); 1889 vtd_as->context_cache_entry.context_cache_gen = 0; 1890 vtd_iommu_unlock(s); 1891 /* 1892 * Do switch address space when needed, in case if the 1893 * device passthrough bit is switched. 1894 */ 1895 vtd_switch_address_space(vtd_as); 1896 /* 1897 * So a device is moving out of (or moving into) a 1898 * domain, resync the shadow page table. 1899 * This won't bring bad even if we have no such 1900 * notifier registered - the IOMMU notification 1901 * framework will skip MAP notifications if that 1902 * happened. 1903 */ 1904 vtd_sync_shadow_page_table(vtd_as); 1905 } 1906 } 1907 } 1908 } 1909 1910 /* Context-cache invalidation 1911 * Returns the Context Actual Invalidation Granularity. 1912 * @val: the content of the CCMD_REG 1913 */ 1914 static uint64_t vtd_context_cache_invalidate(IntelIOMMUState *s, uint64_t val) 1915 { 1916 uint64_t caig; 1917 uint64_t type = val & VTD_CCMD_CIRG_MASK; 1918 1919 switch (type) { 1920 case VTD_CCMD_DOMAIN_INVL: 1921 /* Fall through */ 1922 case VTD_CCMD_GLOBAL_INVL: 1923 caig = VTD_CCMD_GLOBAL_INVL_A; 1924 vtd_context_global_invalidate(s); 1925 break; 1926 1927 case VTD_CCMD_DEVICE_INVL: 1928 caig = VTD_CCMD_DEVICE_INVL_A; 1929 vtd_context_device_invalidate(s, VTD_CCMD_SID(val), VTD_CCMD_FM(val)); 1930 break; 1931 1932 default: 1933 error_report_once("%s: invalid context: 0x%" PRIx64, 1934 __func__, val); 1935 caig = 0; 1936 } 1937 return caig; 1938 } 1939 1940 static void vtd_iotlb_global_invalidate(IntelIOMMUState *s) 1941 { 1942 trace_vtd_inv_desc_iotlb_global(); 1943 vtd_reset_iotlb(s); 1944 vtd_iommu_replay_all(s); 1945 } 1946 1947 static void vtd_iotlb_domain_invalidate(IntelIOMMUState *s, uint16_t domain_id) 1948 { 1949 VTDContextEntry ce; 1950 VTDAddressSpace *vtd_as; 1951 1952 trace_vtd_inv_desc_iotlb_domain(domain_id); 1953 1954 vtd_iommu_lock(s); 1955 g_hash_table_foreach_remove(s->iotlb, vtd_hash_remove_by_domain, 1956 &domain_id); 1957 vtd_iommu_unlock(s); 1958 1959 QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) { 1960 if (!vtd_dev_to_context_entry(s, pci_bus_num(vtd_as->bus), 1961 vtd_as->devfn, &ce) && 1962 domain_id == vtd_get_domain_id(s, &ce)) { 1963 vtd_sync_shadow_page_table(vtd_as); 1964 } 1965 } 1966 } 1967 1968 static void vtd_iotlb_page_invalidate_notify(IntelIOMMUState *s, 1969 uint16_t domain_id, hwaddr addr, 1970 uint8_t am) 1971 { 1972 VTDAddressSpace *vtd_as; 1973 VTDContextEntry ce; 1974 int ret; 1975 hwaddr size = (1 << am) * VTD_PAGE_SIZE; 1976 1977 QLIST_FOREACH(vtd_as, &(s->vtd_as_with_notifiers), next) { 1978 ret = vtd_dev_to_context_entry(s, pci_bus_num(vtd_as->bus), 1979 vtd_as->devfn, &ce); 1980 if (!ret && domain_id == vtd_get_domain_id(s, &ce)) { 1981 if (vtd_as_has_map_notifier(vtd_as)) { 1982 /* 1983 * As long as we have MAP notifications registered in 1984 * any of our IOMMU notifiers, we need to sync the 1985 * shadow page table. 1986 */ 1987 vtd_sync_shadow_page_table_range(vtd_as, &ce, addr, size); 1988 } else { 1989 /* 1990 * For UNMAP-only notifiers, we don't need to walk the 1991 * page tables. We just deliver the PSI down to 1992 * invalidate caches. 1993 */ 1994 IOMMUTLBEntry entry = { 1995 .target_as = &address_space_memory, 1996 .iova = addr, 1997 .translated_addr = 0, 1998 .addr_mask = size - 1, 1999 .perm = IOMMU_NONE, 2000 }; 2001 memory_region_notify_iommu(&vtd_as->iommu, 0, entry); 2002 } 2003 } 2004 } 2005 } 2006 2007 static void vtd_iotlb_page_invalidate(IntelIOMMUState *s, uint16_t domain_id, 2008 hwaddr addr, uint8_t am) 2009 { 2010 VTDIOTLBPageInvInfo info; 2011 2012 trace_vtd_inv_desc_iotlb_pages(domain_id, addr, am); 2013 2014 assert(am <= VTD_MAMV); 2015 info.domain_id = domain_id; 2016 info.addr = addr; 2017 info.mask = ~((1 << am) - 1); 2018 vtd_iommu_lock(s); 2019 g_hash_table_foreach_remove(s->iotlb, vtd_hash_remove_by_page, &info); 2020 vtd_iommu_unlock(s); 2021 vtd_iotlb_page_invalidate_notify(s, domain_id, addr, am); 2022 } 2023 2024 /* Flush IOTLB 2025 * Returns the IOTLB Actual Invalidation Granularity. 2026 * @val: the content of the IOTLB_REG 2027 */ 2028 static uint64_t vtd_iotlb_flush(IntelIOMMUState *s, uint64_t val) 2029 { 2030 uint64_t iaig; 2031 uint64_t type = val & VTD_TLB_FLUSH_GRANU_MASK; 2032 uint16_t domain_id; 2033 hwaddr addr; 2034 uint8_t am; 2035 2036 switch (type) { 2037 case VTD_TLB_GLOBAL_FLUSH: 2038 iaig = VTD_TLB_GLOBAL_FLUSH_A; 2039 vtd_iotlb_global_invalidate(s); 2040 break; 2041 2042 case VTD_TLB_DSI_FLUSH: 2043 domain_id = VTD_TLB_DID(val); 2044 iaig = VTD_TLB_DSI_FLUSH_A; 2045 vtd_iotlb_domain_invalidate(s, domain_id); 2046 break; 2047 2048 case VTD_TLB_PSI_FLUSH: 2049 domain_id = VTD_TLB_DID(val); 2050 addr = vtd_get_quad_raw(s, DMAR_IVA_REG); 2051 am = VTD_IVA_AM(addr); 2052 addr = VTD_IVA_ADDR(addr); 2053 if (am > VTD_MAMV) { 2054 error_report_once("%s: address mask overflow: 0x%" PRIx64, 2055 __func__, vtd_get_quad_raw(s, DMAR_IVA_REG)); 2056 iaig = 0; 2057 break; 2058 } 2059 iaig = VTD_TLB_PSI_FLUSH_A; 2060 vtd_iotlb_page_invalidate(s, domain_id, addr, am); 2061 break; 2062 2063 default: 2064 error_report_once("%s: invalid granularity: 0x%" PRIx64, 2065 __func__, val); 2066 iaig = 0; 2067 } 2068 return iaig; 2069 } 2070 2071 static void vtd_fetch_inv_desc(IntelIOMMUState *s); 2072 2073 static inline bool vtd_queued_inv_disable_check(IntelIOMMUState *s) 2074 { 2075 return s->qi_enabled && (s->iq_tail == s->iq_head) && 2076 (s->iq_last_desc_type == VTD_INV_DESC_WAIT); 2077 } 2078 2079 static void vtd_handle_gcmd_qie(IntelIOMMUState *s, bool en) 2080 { 2081 uint64_t iqa_val = vtd_get_quad_raw(s, DMAR_IQA_REG); 2082 2083 trace_vtd_inv_qi_enable(en); 2084 2085 if (en) { 2086 s->iq = iqa_val & VTD_IQA_IQA_MASK(s->aw_bits); 2087 /* 2^(x+8) entries */ 2088 s->iq_size = 1UL << ((iqa_val & VTD_IQA_QS) + 8 - (s->iq_dw ? 1 : 0)); 2089 s->qi_enabled = true; 2090 trace_vtd_inv_qi_setup(s->iq, s->iq_size); 2091 /* Ok - report back to driver */ 2092 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, 0, VTD_GSTS_QIES); 2093 2094 if (s->iq_tail != 0) { 2095 /* 2096 * This is a spec violation but Windows guests are known to set up 2097 * Queued Invalidation this way so we allow the write and process 2098 * Invalidation Descriptors right away. 2099 */ 2100 trace_vtd_warn_invalid_qi_tail(s->iq_tail); 2101 if (!(vtd_get_long_raw(s, DMAR_FSTS_REG) & VTD_FSTS_IQE)) { 2102 vtd_fetch_inv_desc(s); 2103 } 2104 } 2105 } else { 2106 if (vtd_queued_inv_disable_check(s)) { 2107 /* disable Queued Invalidation */ 2108 vtd_set_quad_raw(s, DMAR_IQH_REG, 0); 2109 s->iq_head = 0; 2110 s->qi_enabled = false; 2111 /* Ok - report back to driver */ 2112 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, VTD_GSTS_QIES, 0); 2113 } else { 2114 error_report_once("%s: detected improper state when disable QI " 2115 "(head=0x%x, tail=0x%x, last_type=%d)", 2116 __func__, 2117 s->iq_head, s->iq_tail, s->iq_last_desc_type); 2118 } 2119 } 2120 } 2121 2122 /* Set Root Table Pointer */ 2123 static void vtd_handle_gcmd_srtp(IntelIOMMUState *s) 2124 { 2125 vtd_root_table_setup(s); 2126 /* Ok - report back to driver */ 2127 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, 0, VTD_GSTS_RTPS); 2128 vtd_reset_caches(s); 2129 vtd_address_space_refresh_all(s); 2130 } 2131 2132 /* Set Interrupt Remap Table Pointer */ 2133 static void vtd_handle_gcmd_sirtp(IntelIOMMUState *s) 2134 { 2135 vtd_interrupt_remap_table_setup(s); 2136 /* Ok - report back to driver */ 2137 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, 0, VTD_GSTS_IRTPS); 2138 } 2139 2140 /* Handle Translation Enable/Disable */ 2141 static void vtd_handle_gcmd_te(IntelIOMMUState *s, bool en) 2142 { 2143 if (s->dmar_enabled == en) { 2144 return; 2145 } 2146 2147 trace_vtd_dmar_enable(en); 2148 2149 if (en) { 2150 s->dmar_enabled = true; 2151 /* Ok - report back to driver */ 2152 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, 0, VTD_GSTS_TES); 2153 } else { 2154 s->dmar_enabled = false; 2155 2156 /* Clear the index of Fault Recording Register */ 2157 s->next_frcd_reg = 0; 2158 /* Ok - report back to driver */ 2159 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, VTD_GSTS_TES, 0); 2160 } 2161 2162 vtd_reset_caches(s); 2163 vtd_address_space_refresh_all(s); 2164 } 2165 2166 /* Handle Interrupt Remap Enable/Disable */ 2167 static void vtd_handle_gcmd_ire(IntelIOMMUState *s, bool en) 2168 { 2169 trace_vtd_ir_enable(en); 2170 2171 if (en) { 2172 s->intr_enabled = true; 2173 /* Ok - report back to driver */ 2174 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, 0, VTD_GSTS_IRES); 2175 } else { 2176 s->intr_enabled = false; 2177 /* Ok - report back to driver */ 2178 vtd_set_clear_mask_long(s, DMAR_GSTS_REG, VTD_GSTS_IRES, 0); 2179 } 2180 } 2181 2182 /* Handle write to Global Command Register */ 2183 static void vtd_handle_gcmd_write(IntelIOMMUState *s) 2184 { 2185 uint32_t status = vtd_get_long_raw(s, DMAR_GSTS_REG); 2186 uint32_t val = vtd_get_long_raw(s, DMAR_GCMD_REG); 2187 uint32_t changed = status ^ val; 2188 2189 trace_vtd_reg_write_gcmd(status, val); 2190 if (changed & VTD_GCMD_TE) { 2191 /* Translation enable/disable */ 2192 vtd_handle_gcmd_te(s, val & VTD_GCMD_TE); 2193 } 2194 if (val & VTD_GCMD_SRTP) { 2195 /* Set/update the root-table pointer */ 2196 vtd_handle_gcmd_srtp(s); 2197 } 2198 if (changed & VTD_GCMD_QIE) { 2199 /* Queued Invalidation Enable */ 2200 vtd_handle_gcmd_qie(s, val & VTD_GCMD_QIE); 2201 } 2202 if (val & VTD_GCMD_SIRTP) { 2203 /* Set/update the interrupt remapping root-table pointer */ 2204 vtd_handle_gcmd_sirtp(s); 2205 } 2206 if (changed & VTD_GCMD_IRE) { 2207 /* Interrupt remap enable/disable */ 2208 vtd_handle_gcmd_ire(s, val & VTD_GCMD_IRE); 2209 } 2210 } 2211 2212 /* Handle write to Context Command Register */ 2213 static void vtd_handle_ccmd_write(IntelIOMMUState *s) 2214 { 2215 uint64_t ret; 2216 uint64_t val = vtd_get_quad_raw(s, DMAR_CCMD_REG); 2217 2218 /* Context-cache invalidation request */ 2219 if (val & VTD_CCMD_ICC) { 2220 if (s->qi_enabled) { 2221 error_report_once("Queued Invalidation enabled, " 2222 "should not use register-based invalidation"); 2223 return; 2224 } 2225 ret = vtd_context_cache_invalidate(s, val); 2226 /* Invalidation completed. Change something to show */ 2227 vtd_set_clear_mask_quad(s, DMAR_CCMD_REG, VTD_CCMD_ICC, 0ULL); 2228 ret = vtd_set_clear_mask_quad(s, DMAR_CCMD_REG, VTD_CCMD_CAIG_MASK, 2229 ret); 2230 } 2231 } 2232 2233 /* Handle write to IOTLB Invalidation Register */ 2234 static void vtd_handle_iotlb_write(IntelIOMMUState *s) 2235 { 2236 uint64_t ret; 2237 uint64_t val = vtd_get_quad_raw(s, DMAR_IOTLB_REG); 2238 2239 /* IOTLB invalidation request */ 2240 if (val & VTD_TLB_IVT) { 2241 if (s->qi_enabled) { 2242 error_report_once("Queued Invalidation enabled, " 2243 "should not use register-based invalidation"); 2244 return; 2245 } 2246 ret = vtd_iotlb_flush(s, val); 2247 /* Invalidation completed. Change something to show */ 2248 vtd_set_clear_mask_quad(s, DMAR_IOTLB_REG, VTD_TLB_IVT, 0ULL); 2249 ret = vtd_set_clear_mask_quad(s, DMAR_IOTLB_REG, 2250 VTD_TLB_FLUSH_GRANU_MASK_A, ret); 2251 } 2252 } 2253 2254 /* Fetch an Invalidation Descriptor from the Invalidation Queue */ 2255 static bool vtd_get_inv_desc(IntelIOMMUState *s, 2256 VTDInvDesc *inv_desc) 2257 { 2258 dma_addr_t base_addr = s->iq; 2259 uint32_t offset = s->iq_head; 2260 uint32_t dw = s->iq_dw ? 32 : 16; 2261 dma_addr_t addr = base_addr + offset * dw; 2262 2263 if (dma_memory_read(&address_space_memory, addr, inv_desc, dw)) { 2264 error_report_once("Read INV DESC failed."); 2265 return false; 2266 } 2267 inv_desc->lo = le64_to_cpu(inv_desc->lo); 2268 inv_desc->hi = le64_to_cpu(inv_desc->hi); 2269 if (dw == 32) { 2270 inv_desc->val[2] = le64_to_cpu(inv_desc->val[2]); 2271 inv_desc->val[3] = le64_to_cpu(inv_desc->val[3]); 2272 } 2273 return true; 2274 } 2275 2276 static bool vtd_process_wait_desc(IntelIOMMUState *s, VTDInvDesc *inv_desc) 2277 { 2278 if ((inv_desc->hi & VTD_INV_DESC_WAIT_RSVD_HI) || 2279 (inv_desc->lo & VTD_INV_DESC_WAIT_RSVD_LO)) { 2280 error_report_once("%s: invalid wait desc: hi=%"PRIx64", lo=%"PRIx64 2281 " (reserved nonzero)", __func__, inv_desc->hi, 2282 inv_desc->lo); 2283 return false; 2284 } 2285 if (inv_desc->lo & VTD_INV_DESC_WAIT_SW) { 2286 /* Status Write */ 2287 uint32_t status_data = (uint32_t)(inv_desc->lo >> 2288 VTD_INV_DESC_WAIT_DATA_SHIFT); 2289 2290 assert(!(inv_desc->lo & VTD_INV_DESC_WAIT_IF)); 2291 2292 /* FIXME: need to be masked with HAW? */ 2293 dma_addr_t status_addr = inv_desc->hi; 2294 trace_vtd_inv_desc_wait_sw(status_addr, status_data); 2295 status_data = cpu_to_le32(status_data); 2296 if (dma_memory_write(&address_space_memory, status_addr, &status_data, 2297 sizeof(status_data))) { 2298 trace_vtd_inv_desc_wait_write_fail(inv_desc->hi, inv_desc->lo); 2299 return false; 2300 } 2301 } else if (inv_desc->lo & VTD_INV_DESC_WAIT_IF) { 2302 /* Interrupt flag */ 2303 vtd_generate_completion_event(s); 2304 } else { 2305 error_report_once("%s: invalid wait desc: hi=%"PRIx64", lo=%"PRIx64 2306 " (unknown type)", __func__, inv_desc->hi, 2307 inv_desc->lo); 2308 return false; 2309 } 2310 return true; 2311 } 2312 2313 static bool vtd_process_context_cache_desc(IntelIOMMUState *s, 2314 VTDInvDesc *inv_desc) 2315 { 2316 uint16_t sid, fmask; 2317 2318 if ((inv_desc->lo & VTD_INV_DESC_CC_RSVD) || inv_desc->hi) { 2319 error_report_once("%s: invalid cc inv desc: hi=%"PRIx64", lo=%"PRIx64 2320 " (reserved nonzero)", __func__, inv_desc->hi, 2321 inv_desc->lo); 2322 return false; 2323 } 2324 switch (inv_desc->lo & VTD_INV_DESC_CC_G) { 2325 case VTD_INV_DESC_CC_DOMAIN: 2326 trace_vtd_inv_desc_cc_domain( 2327 (uint16_t)VTD_INV_DESC_CC_DID(inv_desc->lo)); 2328 /* Fall through */ 2329 case VTD_INV_DESC_CC_GLOBAL: 2330 vtd_context_global_invalidate(s); 2331 break; 2332 2333 case VTD_INV_DESC_CC_DEVICE: 2334 sid = VTD_INV_DESC_CC_SID(inv_desc->lo); 2335 fmask = VTD_INV_DESC_CC_FM(inv_desc->lo); 2336 vtd_context_device_invalidate(s, sid, fmask); 2337 break; 2338 2339 default: 2340 error_report_once("%s: invalid cc inv desc: hi=%"PRIx64", lo=%"PRIx64 2341 " (invalid type)", __func__, inv_desc->hi, 2342 inv_desc->lo); 2343 return false; 2344 } 2345 return true; 2346 } 2347 2348 static bool vtd_process_iotlb_desc(IntelIOMMUState *s, VTDInvDesc *inv_desc) 2349 { 2350 uint16_t domain_id; 2351 uint8_t am; 2352 hwaddr addr; 2353 2354 if ((inv_desc->lo & VTD_INV_DESC_IOTLB_RSVD_LO) || 2355 (inv_desc->hi & VTD_INV_DESC_IOTLB_RSVD_HI)) { 2356 error_report_once("%s: invalid iotlb inv desc: hi=0x%"PRIx64 2357 ", lo=0x%"PRIx64" (reserved bits unzero)\n", 2358 __func__, inv_desc->hi, inv_desc->lo); 2359 return false; 2360 } 2361 2362 switch (inv_desc->lo & VTD_INV_DESC_IOTLB_G) { 2363 case VTD_INV_DESC_IOTLB_GLOBAL: 2364 vtd_iotlb_global_invalidate(s); 2365 break; 2366 2367 case VTD_INV_DESC_IOTLB_DOMAIN: 2368 domain_id = VTD_INV_DESC_IOTLB_DID(inv_desc->lo); 2369 vtd_iotlb_domain_invalidate(s, domain_id); 2370 break; 2371 2372 case VTD_INV_DESC_IOTLB_PAGE: 2373 domain_id = VTD_INV_DESC_IOTLB_DID(inv_desc->lo); 2374 addr = VTD_INV_DESC_IOTLB_ADDR(inv_desc->hi); 2375 am = VTD_INV_DESC_IOTLB_AM(inv_desc->hi); 2376 if (am > VTD_MAMV) { 2377 error_report_once("%s: invalid iotlb inv desc: hi=0x%"PRIx64 2378 ", lo=0x%"PRIx64" (am=%u > VTD_MAMV=%u)\n", 2379 __func__, inv_desc->hi, inv_desc->lo, 2380 am, (unsigned)VTD_MAMV); 2381 return false; 2382 } 2383 vtd_iotlb_page_invalidate(s, domain_id, addr, am); 2384 break; 2385 2386 default: 2387 error_report_once("%s: invalid iotlb inv desc: hi=0x%"PRIx64 2388 ", lo=0x%"PRIx64" (type mismatch: 0x%llx)\n", 2389 __func__, inv_desc->hi, inv_desc->lo, 2390 inv_desc->lo & VTD_INV_DESC_IOTLB_G); 2391 return false; 2392 } 2393 return true; 2394 } 2395 2396 static bool vtd_process_inv_iec_desc(IntelIOMMUState *s, 2397 VTDInvDesc *inv_desc) 2398 { 2399 trace_vtd_inv_desc_iec(inv_desc->iec.granularity, 2400 inv_desc->iec.index, 2401 inv_desc->iec.index_mask); 2402 2403 vtd_iec_notify_all(s, !inv_desc->iec.granularity, 2404 inv_desc->iec.index, 2405 inv_desc->iec.index_mask); 2406 return true; 2407 } 2408 2409 static bool vtd_process_device_iotlb_desc(IntelIOMMUState *s, 2410 VTDInvDesc *inv_desc) 2411 { 2412 VTDAddressSpace *vtd_dev_as; 2413 IOMMUTLBEntry entry; 2414 struct VTDBus *vtd_bus; 2415 hwaddr addr; 2416 uint64_t sz; 2417 uint16_t sid; 2418 uint8_t devfn; 2419 bool size; 2420 uint8_t bus_num; 2421 2422 addr = VTD_INV_DESC_DEVICE_IOTLB_ADDR(inv_desc->hi); 2423 sid = VTD_INV_DESC_DEVICE_IOTLB_SID(inv_desc->lo); 2424 devfn = sid & 0xff; 2425 bus_num = sid >> 8; 2426 size = VTD_INV_DESC_DEVICE_IOTLB_SIZE(inv_desc->hi); 2427 2428 if ((inv_desc->lo & VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO) || 2429 (inv_desc->hi & VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI)) { 2430 error_report_once("%s: invalid dev-iotlb inv desc: hi=%"PRIx64 2431 ", lo=%"PRIx64" (reserved nonzero)", __func__, 2432 inv_desc->hi, inv_desc->lo); 2433 return false; 2434 } 2435 2436 vtd_bus = vtd_find_as_from_bus_num(s, bus_num); 2437 if (!vtd_bus) { 2438 goto done; 2439 } 2440 2441 vtd_dev_as = vtd_bus->dev_as[devfn]; 2442 if (!vtd_dev_as) { 2443 goto done; 2444 } 2445 2446 /* According to ATS spec table 2.4: 2447 * S = 0, bits 15:12 = xxxx range size: 4K 2448 * S = 1, bits 15:12 = xxx0 range size: 8K 2449 * S = 1, bits 15:12 = xx01 range size: 16K 2450 * S = 1, bits 15:12 = x011 range size: 32K 2451 * S = 1, bits 15:12 = 0111 range size: 64K 2452 * ... 2453 */ 2454 if (size) { 2455 sz = (VTD_PAGE_SIZE * 2) << cto64(addr >> VTD_PAGE_SHIFT); 2456 addr &= ~(sz - 1); 2457 } else { 2458 sz = VTD_PAGE_SIZE; 2459 } 2460 2461 entry.target_as = &vtd_dev_as->as; 2462 entry.addr_mask = sz - 1; 2463 entry.iova = addr; 2464 entry.perm = IOMMU_NONE; 2465 entry.translated_addr = 0; 2466 memory_region_notify_iommu(&vtd_dev_as->iommu, 0, entry); 2467 2468 done: 2469 return true; 2470 } 2471 2472 static bool vtd_process_inv_desc(IntelIOMMUState *s) 2473 { 2474 VTDInvDesc inv_desc; 2475 uint8_t desc_type; 2476 2477 trace_vtd_inv_qi_head(s->iq_head); 2478 if (!vtd_get_inv_desc(s, &inv_desc)) { 2479 s->iq_last_desc_type = VTD_INV_DESC_NONE; 2480 return false; 2481 } 2482 2483 desc_type = inv_desc.lo & VTD_INV_DESC_TYPE; 2484 /* FIXME: should update at first or at last? */ 2485 s->iq_last_desc_type = desc_type; 2486 2487 switch (desc_type) { 2488 case VTD_INV_DESC_CC: 2489 trace_vtd_inv_desc("context-cache", inv_desc.hi, inv_desc.lo); 2490 if (!vtd_process_context_cache_desc(s, &inv_desc)) { 2491 return false; 2492 } 2493 break; 2494 2495 case VTD_INV_DESC_IOTLB: 2496 trace_vtd_inv_desc("iotlb", inv_desc.hi, inv_desc.lo); 2497 if (!vtd_process_iotlb_desc(s, &inv_desc)) { 2498 return false; 2499 } 2500 break; 2501 2502 /* 2503 * TODO: the entity of below two cases will be implemented in future series. 2504 * To make guest (which integrates scalable mode support patch set in 2505 * iommu driver) work, just return true is enough so far. 2506 */ 2507 case VTD_INV_DESC_PC: 2508 break; 2509 2510 case VTD_INV_DESC_PIOTLB: 2511 break; 2512 2513 case VTD_INV_DESC_WAIT: 2514 trace_vtd_inv_desc("wait", inv_desc.hi, inv_desc.lo); 2515 if (!vtd_process_wait_desc(s, &inv_desc)) { 2516 return false; 2517 } 2518 break; 2519 2520 case VTD_INV_DESC_IEC: 2521 trace_vtd_inv_desc("iec", inv_desc.hi, inv_desc.lo); 2522 if (!vtd_process_inv_iec_desc(s, &inv_desc)) { 2523 return false; 2524 } 2525 break; 2526 2527 case VTD_INV_DESC_DEVICE: 2528 trace_vtd_inv_desc("device", inv_desc.hi, inv_desc.lo); 2529 if (!vtd_process_device_iotlb_desc(s, &inv_desc)) { 2530 return false; 2531 } 2532 break; 2533 2534 default: 2535 error_report_once("%s: invalid inv desc: hi=%"PRIx64", lo=%"PRIx64 2536 " (unknown type)", __func__, inv_desc.hi, 2537 inv_desc.lo); 2538 return false; 2539 } 2540 s->iq_head++; 2541 if (s->iq_head == s->iq_size) { 2542 s->iq_head = 0; 2543 } 2544 return true; 2545 } 2546 2547 /* Try to fetch and process more Invalidation Descriptors */ 2548 static void vtd_fetch_inv_desc(IntelIOMMUState *s) 2549 { 2550 trace_vtd_inv_qi_fetch(); 2551 2552 if (s->iq_tail >= s->iq_size) { 2553 /* Detects an invalid Tail pointer */ 2554 error_report_once("%s: detected invalid QI tail " 2555 "(tail=0x%x, size=0x%x)", 2556 __func__, s->iq_tail, s->iq_size); 2557 vtd_handle_inv_queue_error(s); 2558 return; 2559 } 2560 while (s->iq_head != s->iq_tail) { 2561 if (!vtd_process_inv_desc(s)) { 2562 /* Invalidation Queue Errors */ 2563 vtd_handle_inv_queue_error(s); 2564 break; 2565 } 2566 /* Must update the IQH_REG in time */ 2567 vtd_set_quad_raw(s, DMAR_IQH_REG, 2568 (((uint64_t)(s->iq_head)) << VTD_IQH_QH_SHIFT) & 2569 VTD_IQH_QH_MASK); 2570 } 2571 } 2572 2573 /* Handle write to Invalidation Queue Tail Register */ 2574 static void vtd_handle_iqt_write(IntelIOMMUState *s) 2575 { 2576 uint64_t val = vtd_get_quad_raw(s, DMAR_IQT_REG); 2577 2578 if (s->iq_dw && (val & VTD_IQT_QT_256_RSV_BIT)) { 2579 error_report_once("%s: RSV bit is set: val=0x%"PRIx64, 2580 __func__, val); 2581 return; 2582 } 2583 s->iq_tail = VTD_IQT_QT(s->iq_dw, val); 2584 trace_vtd_inv_qi_tail(s->iq_tail); 2585 2586 if (s->qi_enabled && !(vtd_get_long_raw(s, DMAR_FSTS_REG) & VTD_FSTS_IQE)) { 2587 /* Process Invalidation Queue here */ 2588 vtd_fetch_inv_desc(s); 2589 } 2590 } 2591 2592 static void vtd_handle_fsts_write(IntelIOMMUState *s) 2593 { 2594 uint32_t fsts_reg = vtd_get_long_raw(s, DMAR_FSTS_REG); 2595 uint32_t fectl_reg = vtd_get_long_raw(s, DMAR_FECTL_REG); 2596 uint32_t status_fields = VTD_FSTS_PFO | VTD_FSTS_PPF | VTD_FSTS_IQE; 2597 2598 if ((fectl_reg & VTD_FECTL_IP) && !(fsts_reg & status_fields)) { 2599 vtd_set_clear_mask_long(s, DMAR_FECTL_REG, VTD_FECTL_IP, 0); 2600 trace_vtd_fsts_clear_ip(); 2601 } 2602 /* FIXME: when IQE is Clear, should we try to fetch some Invalidation 2603 * Descriptors if there are any when Queued Invalidation is enabled? 2604 */ 2605 } 2606 2607 static void vtd_handle_fectl_write(IntelIOMMUState *s) 2608 { 2609 uint32_t fectl_reg; 2610 /* FIXME: when software clears the IM field, check the IP field. But do we 2611 * need to compare the old value and the new value to conclude that 2612 * software clears the IM field? Or just check if the IM field is zero? 2613 */ 2614 fectl_reg = vtd_get_long_raw(s, DMAR_FECTL_REG); 2615 2616 trace_vtd_reg_write_fectl(fectl_reg); 2617 2618 if ((fectl_reg & VTD_FECTL_IP) && !(fectl_reg & VTD_FECTL_IM)) { 2619 vtd_generate_interrupt(s, DMAR_FEADDR_REG, DMAR_FEDATA_REG); 2620 vtd_set_clear_mask_long(s, DMAR_FECTL_REG, VTD_FECTL_IP, 0); 2621 } 2622 } 2623 2624 static void vtd_handle_ics_write(IntelIOMMUState *s) 2625 { 2626 uint32_t ics_reg = vtd_get_long_raw(s, DMAR_ICS_REG); 2627 uint32_t iectl_reg = vtd_get_long_raw(s, DMAR_IECTL_REG); 2628 2629 if ((iectl_reg & VTD_IECTL_IP) && !(ics_reg & VTD_ICS_IWC)) { 2630 trace_vtd_reg_ics_clear_ip(); 2631 vtd_set_clear_mask_long(s, DMAR_IECTL_REG, VTD_IECTL_IP, 0); 2632 } 2633 } 2634 2635 static void vtd_handle_iectl_write(IntelIOMMUState *s) 2636 { 2637 uint32_t iectl_reg; 2638 /* FIXME: when software clears the IM field, check the IP field. But do we 2639 * need to compare the old value and the new value to conclude that 2640 * software clears the IM field? Or just check if the IM field is zero? 2641 */ 2642 iectl_reg = vtd_get_long_raw(s, DMAR_IECTL_REG); 2643 2644 trace_vtd_reg_write_iectl(iectl_reg); 2645 2646 if ((iectl_reg & VTD_IECTL_IP) && !(iectl_reg & VTD_IECTL_IM)) { 2647 vtd_generate_interrupt(s, DMAR_IEADDR_REG, DMAR_IEDATA_REG); 2648 vtd_set_clear_mask_long(s, DMAR_IECTL_REG, VTD_IECTL_IP, 0); 2649 } 2650 } 2651 2652 static uint64_t vtd_mem_read(void *opaque, hwaddr addr, unsigned size) 2653 { 2654 IntelIOMMUState *s = opaque; 2655 uint64_t val; 2656 2657 trace_vtd_reg_read(addr, size); 2658 2659 if (addr + size > DMAR_REG_SIZE) { 2660 error_report_once("%s: MMIO over range: addr=0x%" PRIx64 2661 " size=0x%u", __func__, addr, size); 2662 return (uint64_t)-1; 2663 } 2664 2665 switch (addr) { 2666 /* Root Table Address Register, 64-bit */ 2667 case DMAR_RTADDR_REG: 2668 val = vtd_get_quad_raw(s, DMAR_RTADDR_REG); 2669 if (size == 4) { 2670 val = val & ((1ULL << 32) - 1); 2671 } 2672 break; 2673 2674 case DMAR_RTADDR_REG_HI: 2675 assert(size == 4); 2676 val = vtd_get_quad_raw(s, DMAR_RTADDR_REG) >> 32; 2677 break; 2678 2679 /* Invalidation Queue Address Register, 64-bit */ 2680 case DMAR_IQA_REG: 2681 val = s->iq | (vtd_get_quad(s, DMAR_IQA_REG) & VTD_IQA_QS); 2682 if (size == 4) { 2683 val = val & ((1ULL << 32) - 1); 2684 } 2685 break; 2686 2687 case DMAR_IQA_REG_HI: 2688 assert(size == 4); 2689 val = s->iq >> 32; 2690 break; 2691 2692 default: 2693 if (size == 4) { 2694 val = vtd_get_long(s, addr); 2695 } else { 2696 val = vtd_get_quad(s, addr); 2697 } 2698 } 2699 2700 return val; 2701 } 2702 2703 static void vtd_mem_write(void *opaque, hwaddr addr, 2704 uint64_t val, unsigned size) 2705 { 2706 IntelIOMMUState *s = opaque; 2707 2708 trace_vtd_reg_write(addr, size, val); 2709 2710 if (addr + size > DMAR_REG_SIZE) { 2711 error_report_once("%s: MMIO over range: addr=0x%" PRIx64 2712 " size=0x%u", __func__, addr, size); 2713 return; 2714 } 2715 2716 switch (addr) { 2717 /* Global Command Register, 32-bit */ 2718 case DMAR_GCMD_REG: 2719 vtd_set_long(s, addr, val); 2720 vtd_handle_gcmd_write(s); 2721 break; 2722 2723 /* Context Command Register, 64-bit */ 2724 case DMAR_CCMD_REG: 2725 if (size == 4) { 2726 vtd_set_long(s, addr, val); 2727 } else { 2728 vtd_set_quad(s, addr, val); 2729 vtd_handle_ccmd_write(s); 2730 } 2731 break; 2732 2733 case DMAR_CCMD_REG_HI: 2734 assert(size == 4); 2735 vtd_set_long(s, addr, val); 2736 vtd_handle_ccmd_write(s); 2737 break; 2738 2739 /* IOTLB Invalidation Register, 64-bit */ 2740 case DMAR_IOTLB_REG: 2741 if (size == 4) { 2742 vtd_set_long(s, addr, val); 2743 } else { 2744 vtd_set_quad(s, addr, val); 2745 vtd_handle_iotlb_write(s); 2746 } 2747 break; 2748 2749 case DMAR_IOTLB_REG_HI: 2750 assert(size == 4); 2751 vtd_set_long(s, addr, val); 2752 vtd_handle_iotlb_write(s); 2753 break; 2754 2755 /* Invalidate Address Register, 64-bit */ 2756 case DMAR_IVA_REG: 2757 if (size == 4) { 2758 vtd_set_long(s, addr, val); 2759 } else { 2760 vtd_set_quad(s, addr, val); 2761 } 2762 break; 2763 2764 case DMAR_IVA_REG_HI: 2765 assert(size == 4); 2766 vtd_set_long(s, addr, val); 2767 break; 2768 2769 /* Fault Status Register, 32-bit */ 2770 case DMAR_FSTS_REG: 2771 assert(size == 4); 2772 vtd_set_long(s, addr, val); 2773 vtd_handle_fsts_write(s); 2774 break; 2775 2776 /* Fault Event Control Register, 32-bit */ 2777 case DMAR_FECTL_REG: 2778 assert(size == 4); 2779 vtd_set_long(s, addr, val); 2780 vtd_handle_fectl_write(s); 2781 break; 2782 2783 /* Fault Event Data Register, 32-bit */ 2784 case DMAR_FEDATA_REG: 2785 assert(size == 4); 2786 vtd_set_long(s, addr, val); 2787 break; 2788 2789 /* Fault Event Address Register, 32-bit */ 2790 case DMAR_FEADDR_REG: 2791 if (size == 4) { 2792 vtd_set_long(s, addr, val); 2793 } else { 2794 /* 2795 * While the register is 32-bit only, some guests (Xen...) write to 2796 * it with 64-bit. 2797 */ 2798 vtd_set_quad(s, addr, val); 2799 } 2800 break; 2801 2802 /* Fault Event Upper Address Register, 32-bit */ 2803 case DMAR_FEUADDR_REG: 2804 assert(size == 4); 2805 vtd_set_long(s, addr, val); 2806 break; 2807 2808 /* Protected Memory Enable Register, 32-bit */ 2809 case DMAR_PMEN_REG: 2810 assert(size == 4); 2811 vtd_set_long(s, addr, val); 2812 break; 2813 2814 /* Root Table Address Register, 64-bit */ 2815 case DMAR_RTADDR_REG: 2816 if (size == 4) { 2817 vtd_set_long(s, addr, val); 2818 } else { 2819 vtd_set_quad(s, addr, val); 2820 } 2821 break; 2822 2823 case DMAR_RTADDR_REG_HI: 2824 assert(size == 4); 2825 vtd_set_long(s, addr, val); 2826 break; 2827 2828 /* Invalidation Queue Tail Register, 64-bit */ 2829 case DMAR_IQT_REG: 2830 if (size == 4) { 2831 vtd_set_long(s, addr, val); 2832 } else { 2833 vtd_set_quad(s, addr, val); 2834 } 2835 vtd_handle_iqt_write(s); 2836 break; 2837 2838 case DMAR_IQT_REG_HI: 2839 assert(size == 4); 2840 vtd_set_long(s, addr, val); 2841 /* 19:63 of IQT_REG is RsvdZ, do nothing here */ 2842 break; 2843 2844 /* Invalidation Queue Address Register, 64-bit */ 2845 case DMAR_IQA_REG: 2846 if (size == 4) { 2847 vtd_set_long(s, addr, val); 2848 } else { 2849 vtd_set_quad(s, addr, val); 2850 } 2851 if (s->ecap & VTD_ECAP_SMTS && 2852 val & VTD_IQA_DW_MASK) { 2853 s->iq_dw = true; 2854 } else { 2855 s->iq_dw = false; 2856 } 2857 break; 2858 2859 case DMAR_IQA_REG_HI: 2860 assert(size == 4); 2861 vtd_set_long(s, addr, val); 2862 break; 2863 2864 /* Invalidation Completion Status Register, 32-bit */ 2865 case DMAR_ICS_REG: 2866 assert(size == 4); 2867 vtd_set_long(s, addr, val); 2868 vtd_handle_ics_write(s); 2869 break; 2870 2871 /* Invalidation Event Control Register, 32-bit */ 2872 case DMAR_IECTL_REG: 2873 assert(size == 4); 2874 vtd_set_long(s, addr, val); 2875 vtd_handle_iectl_write(s); 2876 break; 2877 2878 /* Invalidation Event Data Register, 32-bit */ 2879 case DMAR_IEDATA_REG: 2880 assert(size == 4); 2881 vtd_set_long(s, addr, val); 2882 break; 2883 2884 /* Invalidation Event Address Register, 32-bit */ 2885 case DMAR_IEADDR_REG: 2886 assert(size == 4); 2887 vtd_set_long(s, addr, val); 2888 break; 2889 2890 /* Invalidation Event Upper Address Register, 32-bit */ 2891 case DMAR_IEUADDR_REG: 2892 assert(size == 4); 2893 vtd_set_long(s, addr, val); 2894 break; 2895 2896 /* Fault Recording Registers, 128-bit */ 2897 case DMAR_FRCD_REG_0_0: 2898 if (size == 4) { 2899 vtd_set_long(s, addr, val); 2900 } else { 2901 vtd_set_quad(s, addr, val); 2902 } 2903 break; 2904 2905 case DMAR_FRCD_REG_0_1: 2906 assert(size == 4); 2907 vtd_set_long(s, addr, val); 2908 break; 2909 2910 case DMAR_FRCD_REG_0_2: 2911 if (size == 4) { 2912 vtd_set_long(s, addr, val); 2913 } else { 2914 vtd_set_quad(s, addr, val); 2915 /* May clear bit 127 (Fault), update PPF */ 2916 vtd_update_fsts_ppf(s); 2917 } 2918 break; 2919 2920 case DMAR_FRCD_REG_0_3: 2921 assert(size == 4); 2922 vtd_set_long(s, addr, val); 2923 /* May clear bit 127 (Fault), update PPF */ 2924 vtd_update_fsts_ppf(s); 2925 break; 2926 2927 case DMAR_IRTA_REG: 2928 if (size == 4) { 2929 vtd_set_long(s, addr, val); 2930 } else { 2931 vtd_set_quad(s, addr, val); 2932 } 2933 break; 2934 2935 case DMAR_IRTA_REG_HI: 2936 assert(size == 4); 2937 vtd_set_long(s, addr, val); 2938 break; 2939 2940 default: 2941 if (size == 4) { 2942 vtd_set_long(s, addr, val); 2943 } else { 2944 vtd_set_quad(s, addr, val); 2945 } 2946 } 2947 } 2948 2949 static IOMMUTLBEntry vtd_iommu_translate(IOMMUMemoryRegion *iommu, hwaddr addr, 2950 IOMMUAccessFlags flag, int iommu_idx) 2951 { 2952 VTDAddressSpace *vtd_as = container_of(iommu, VTDAddressSpace, iommu); 2953 IntelIOMMUState *s = vtd_as->iommu_state; 2954 IOMMUTLBEntry iotlb = { 2955 /* We'll fill in the rest later. */ 2956 .target_as = &address_space_memory, 2957 }; 2958 bool success; 2959 2960 if (likely(s->dmar_enabled)) { 2961 success = vtd_do_iommu_translate(vtd_as, vtd_as->bus, vtd_as->devfn, 2962 addr, flag & IOMMU_WO, &iotlb); 2963 } else { 2964 /* DMAR disabled, passthrough, use 4k-page*/ 2965 iotlb.iova = addr & VTD_PAGE_MASK_4K; 2966 iotlb.translated_addr = addr & VTD_PAGE_MASK_4K; 2967 iotlb.addr_mask = ~VTD_PAGE_MASK_4K; 2968 iotlb.perm = IOMMU_RW; 2969 success = true; 2970 } 2971 2972 if (likely(success)) { 2973 trace_vtd_dmar_translate(pci_bus_num(vtd_as->bus), 2974 VTD_PCI_SLOT(vtd_as->devfn), 2975 VTD_PCI_FUNC(vtd_as->devfn), 2976 iotlb.iova, iotlb.translated_addr, 2977 iotlb.addr_mask); 2978 } else { 2979 error_report_once("%s: detected translation failure " 2980 "(dev=%02x:%02x:%02x, iova=0x%" PRIx64 ")", 2981 __func__, pci_bus_num(vtd_as->bus), 2982 VTD_PCI_SLOT(vtd_as->devfn), 2983 VTD_PCI_FUNC(vtd_as->devfn), 2984 addr); 2985 } 2986 2987 return iotlb; 2988 } 2989 2990 static int vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu, 2991 IOMMUNotifierFlag old, 2992 IOMMUNotifierFlag new, 2993 Error **errp) 2994 { 2995 VTDAddressSpace *vtd_as = container_of(iommu, VTDAddressSpace, iommu); 2996 IntelIOMMUState *s = vtd_as->iommu_state; 2997 2998 /* Update per-address-space notifier flags */ 2999 vtd_as->notifier_flags = new; 3000 3001 if (old == IOMMU_NOTIFIER_NONE) { 3002 QLIST_INSERT_HEAD(&s->vtd_as_with_notifiers, vtd_as, next); 3003 } else if (new == IOMMU_NOTIFIER_NONE) { 3004 QLIST_REMOVE(vtd_as, next); 3005 } 3006 return 0; 3007 } 3008 3009 static int vtd_post_load(void *opaque, int version_id) 3010 { 3011 IntelIOMMUState *iommu = opaque; 3012 3013 /* 3014 * Memory regions are dynamically turned on/off depending on 3015 * context entry configurations from the guest. After migration, 3016 * we need to make sure the memory regions are still correct. 3017 */ 3018 vtd_switch_address_space_all(iommu); 3019 3020 /* 3021 * We don't need to migrate the root_scalable because we can 3022 * simply do the calculation after the loading is complete. We 3023 * can actually do similar things with root, dmar_enabled, etc. 3024 * however since we've had them already so we'd better keep them 3025 * for compatibility of migration. 3026 */ 3027 vtd_update_scalable_state(iommu); 3028 3029 return 0; 3030 } 3031 3032 static const VMStateDescription vtd_vmstate = { 3033 .name = "iommu-intel", 3034 .version_id = 1, 3035 .minimum_version_id = 1, 3036 .priority = MIG_PRI_IOMMU, 3037 .post_load = vtd_post_load, 3038 .fields = (VMStateField[]) { 3039 VMSTATE_UINT64(root, IntelIOMMUState), 3040 VMSTATE_UINT64(intr_root, IntelIOMMUState), 3041 VMSTATE_UINT64(iq, IntelIOMMUState), 3042 VMSTATE_UINT32(intr_size, IntelIOMMUState), 3043 VMSTATE_UINT16(iq_head, IntelIOMMUState), 3044 VMSTATE_UINT16(iq_tail, IntelIOMMUState), 3045 VMSTATE_UINT16(iq_size, IntelIOMMUState), 3046 VMSTATE_UINT16(next_frcd_reg, IntelIOMMUState), 3047 VMSTATE_UINT8_ARRAY(csr, IntelIOMMUState, DMAR_REG_SIZE), 3048 VMSTATE_UINT8(iq_last_desc_type, IntelIOMMUState), 3049 VMSTATE_UNUSED(1), /* bool root_extended is obsolete by VT-d */ 3050 VMSTATE_BOOL(dmar_enabled, IntelIOMMUState), 3051 VMSTATE_BOOL(qi_enabled, IntelIOMMUState), 3052 VMSTATE_BOOL(intr_enabled, IntelIOMMUState), 3053 VMSTATE_BOOL(intr_eime, IntelIOMMUState), 3054 VMSTATE_END_OF_LIST() 3055 } 3056 }; 3057 3058 static const MemoryRegionOps vtd_mem_ops = { 3059 .read = vtd_mem_read, 3060 .write = vtd_mem_write, 3061 .endianness = DEVICE_LITTLE_ENDIAN, 3062 .impl = { 3063 .min_access_size = 4, 3064 .max_access_size = 8, 3065 }, 3066 .valid = { 3067 .min_access_size = 4, 3068 .max_access_size = 8, 3069 }, 3070 }; 3071 3072 static Property vtd_properties[] = { 3073 DEFINE_PROP_UINT32("version", IntelIOMMUState, version, 0), 3074 DEFINE_PROP_ON_OFF_AUTO("eim", IntelIOMMUState, intr_eim, 3075 ON_OFF_AUTO_AUTO), 3076 DEFINE_PROP_BOOL("x-buggy-eim", IntelIOMMUState, buggy_eim, false), 3077 DEFINE_PROP_UINT8("aw-bits", IntelIOMMUState, aw_bits, 3078 VTD_HOST_ADDRESS_WIDTH), 3079 DEFINE_PROP_BOOL("caching-mode", IntelIOMMUState, caching_mode, FALSE), 3080 DEFINE_PROP_BOOL("x-scalable-mode", IntelIOMMUState, scalable_mode, FALSE), 3081 DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true), 3082 DEFINE_PROP_END_OF_LIST(), 3083 }; 3084 3085 /* Read IRTE entry with specific index */ 3086 static int vtd_irte_get(IntelIOMMUState *iommu, uint16_t index, 3087 VTD_IR_TableEntry *entry, uint16_t sid) 3088 { 3089 static const uint16_t vtd_svt_mask[VTD_SQ_MAX] = \ 3090 {0xffff, 0xfffb, 0xfff9, 0xfff8}; 3091 dma_addr_t addr = 0x00; 3092 uint16_t mask, source_id; 3093 uint8_t bus, bus_max, bus_min; 3094 3095 addr = iommu->intr_root + index * sizeof(*entry); 3096 if (dma_memory_read(&address_space_memory, addr, entry, 3097 sizeof(*entry))) { 3098 error_report_once("%s: read failed: ind=0x%x addr=0x%" PRIx64, 3099 __func__, index, addr); 3100 return -VTD_FR_IR_ROOT_INVAL; 3101 } 3102 3103 trace_vtd_ir_irte_get(index, le64_to_cpu(entry->data[1]), 3104 le64_to_cpu(entry->data[0])); 3105 3106 if (!entry->irte.present) { 3107 error_report_once("%s: detected non-present IRTE " 3108 "(index=%u, high=0x%" PRIx64 ", low=0x%" PRIx64 ")", 3109 __func__, index, le64_to_cpu(entry->data[1]), 3110 le64_to_cpu(entry->data[0])); 3111 return -VTD_FR_IR_ENTRY_P; 3112 } 3113 3114 if (entry->irte.__reserved_0 || entry->irte.__reserved_1 || 3115 entry->irte.__reserved_2) { 3116 error_report_once("%s: detected non-zero reserved IRTE " 3117 "(index=%u, high=0x%" PRIx64 ", low=0x%" PRIx64 ")", 3118 __func__, index, le64_to_cpu(entry->data[1]), 3119 le64_to_cpu(entry->data[0])); 3120 return -VTD_FR_IR_IRTE_RSVD; 3121 } 3122 3123 if (sid != X86_IOMMU_SID_INVALID) { 3124 /* Validate IRTE SID */ 3125 source_id = le32_to_cpu(entry->irte.source_id); 3126 switch (entry->irte.sid_vtype) { 3127 case VTD_SVT_NONE: 3128 break; 3129 3130 case VTD_SVT_ALL: 3131 mask = vtd_svt_mask[entry->irte.sid_q]; 3132 if ((source_id & mask) != (sid & mask)) { 3133 error_report_once("%s: invalid IRTE SID " 3134 "(index=%u, sid=%u, source_id=%u)", 3135 __func__, index, sid, source_id); 3136 return -VTD_FR_IR_SID_ERR; 3137 } 3138 break; 3139 3140 case VTD_SVT_BUS: 3141 bus_max = source_id >> 8; 3142 bus_min = source_id & 0xff; 3143 bus = sid >> 8; 3144 if (bus > bus_max || bus < bus_min) { 3145 error_report_once("%s: invalid SVT_BUS " 3146 "(index=%u, bus=%u, min=%u, max=%u)", 3147 __func__, index, bus, bus_min, bus_max); 3148 return -VTD_FR_IR_SID_ERR; 3149 } 3150 break; 3151 3152 default: 3153 error_report_once("%s: detected invalid IRTE SVT " 3154 "(index=%u, type=%d)", __func__, 3155 index, entry->irte.sid_vtype); 3156 /* Take this as verification failure. */ 3157 return -VTD_FR_IR_SID_ERR; 3158 break; 3159 } 3160 } 3161 3162 return 0; 3163 } 3164 3165 /* Fetch IRQ information of specific IR index */ 3166 static int vtd_remap_irq_get(IntelIOMMUState *iommu, uint16_t index, 3167 X86IOMMUIrq *irq, uint16_t sid) 3168 { 3169 VTD_IR_TableEntry irte = {}; 3170 int ret = 0; 3171 3172 ret = vtd_irte_get(iommu, index, &irte, sid); 3173 if (ret) { 3174 return ret; 3175 } 3176 3177 irq->trigger_mode = irte.irte.trigger_mode; 3178 irq->vector = irte.irte.vector; 3179 irq->delivery_mode = irte.irte.delivery_mode; 3180 irq->dest = le32_to_cpu(irte.irte.dest_id); 3181 if (!iommu->intr_eime) { 3182 #define VTD_IR_APIC_DEST_MASK (0xff00ULL) 3183 #define VTD_IR_APIC_DEST_SHIFT (8) 3184 irq->dest = (irq->dest & VTD_IR_APIC_DEST_MASK) >> 3185 VTD_IR_APIC_DEST_SHIFT; 3186 } 3187 irq->dest_mode = irte.irte.dest_mode; 3188 irq->redir_hint = irte.irte.redir_hint; 3189 3190 trace_vtd_ir_remap(index, irq->trigger_mode, irq->vector, 3191 irq->delivery_mode, irq->dest, irq->dest_mode); 3192 3193 return 0; 3194 } 3195 3196 /* Interrupt remapping for MSI/MSI-X entry */ 3197 static int vtd_interrupt_remap_msi(IntelIOMMUState *iommu, 3198 MSIMessage *origin, 3199 MSIMessage *translated, 3200 uint16_t sid) 3201 { 3202 int ret = 0; 3203 VTD_IR_MSIAddress addr; 3204 uint16_t index; 3205 X86IOMMUIrq irq = {}; 3206 3207 assert(origin && translated); 3208 3209 trace_vtd_ir_remap_msi_req(origin->address, origin->data); 3210 3211 if (!iommu || !iommu->intr_enabled) { 3212 memcpy(translated, origin, sizeof(*origin)); 3213 goto out; 3214 } 3215 3216 if (origin->address & VTD_MSI_ADDR_HI_MASK) { 3217 error_report_once("%s: MSI address high 32 bits non-zero detected: " 3218 "address=0x%" PRIx64, __func__, origin->address); 3219 return -VTD_FR_IR_REQ_RSVD; 3220 } 3221 3222 addr.data = origin->address & VTD_MSI_ADDR_LO_MASK; 3223 if (addr.addr.__head != 0xfee) { 3224 error_report_once("%s: MSI address low 32 bit invalid: 0x%" PRIx32, 3225 __func__, addr.data); 3226 return -VTD_FR_IR_REQ_RSVD; 3227 } 3228 3229 /* This is compatible mode. */ 3230 if (addr.addr.int_mode != VTD_IR_INT_FORMAT_REMAP) { 3231 memcpy(translated, origin, sizeof(*origin)); 3232 goto out; 3233 } 3234 3235 index = addr.addr.index_h << 15 | le16_to_cpu(addr.addr.index_l); 3236 3237 #define VTD_IR_MSI_DATA_SUBHANDLE (0x0000ffff) 3238 #define VTD_IR_MSI_DATA_RESERVED (0xffff0000) 3239 3240 if (addr.addr.sub_valid) { 3241 /* See VT-d spec 5.1.2.2 and 5.1.3 on subhandle */ 3242 index += origin->data & VTD_IR_MSI_DATA_SUBHANDLE; 3243 } 3244 3245 ret = vtd_remap_irq_get(iommu, index, &irq, sid); 3246 if (ret) { 3247 return ret; 3248 } 3249 3250 if (addr.addr.sub_valid) { 3251 trace_vtd_ir_remap_type("MSI"); 3252 if (origin->data & VTD_IR_MSI_DATA_RESERVED) { 3253 error_report_once("%s: invalid IR MSI " 3254 "(sid=%u, address=0x%" PRIx64 3255 ", data=0x%" PRIx32 ")", 3256 __func__, sid, origin->address, origin->data); 3257 return -VTD_FR_IR_REQ_RSVD; 3258 } 3259 } else { 3260 uint8_t vector = origin->data & 0xff; 3261 uint8_t trigger_mode = (origin->data >> MSI_DATA_TRIGGER_SHIFT) & 0x1; 3262 3263 trace_vtd_ir_remap_type("IOAPIC"); 3264 /* IOAPIC entry vector should be aligned with IRTE vector 3265 * (see vt-d spec 5.1.5.1). */ 3266 if (vector != irq.vector) { 3267 trace_vtd_warn_ir_vector(sid, index, vector, irq.vector); 3268 } 3269 3270 /* The Trigger Mode field must match the Trigger Mode in the IRTE. 3271 * (see vt-d spec 5.1.5.1). */ 3272 if (trigger_mode != irq.trigger_mode) { 3273 trace_vtd_warn_ir_trigger(sid, index, trigger_mode, 3274 irq.trigger_mode); 3275 } 3276 } 3277 3278 /* 3279 * We'd better keep the last two bits, assuming that guest OS 3280 * might modify it. Keep it does not hurt after all. 3281 */ 3282 irq.msi_addr_last_bits = addr.addr.__not_care; 3283 3284 /* Translate X86IOMMUIrq to MSI message */ 3285 x86_iommu_irq_to_msi_message(&irq, translated); 3286 3287 out: 3288 trace_vtd_ir_remap_msi(origin->address, origin->data, 3289 translated->address, translated->data); 3290 return 0; 3291 } 3292 3293 static int vtd_int_remap(X86IOMMUState *iommu, MSIMessage *src, 3294 MSIMessage *dst, uint16_t sid) 3295 { 3296 return vtd_interrupt_remap_msi(INTEL_IOMMU_DEVICE(iommu), 3297 src, dst, sid); 3298 } 3299 3300 static MemTxResult vtd_mem_ir_read(void *opaque, hwaddr addr, 3301 uint64_t *data, unsigned size, 3302 MemTxAttrs attrs) 3303 { 3304 return MEMTX_OK; 3305 } 3306 3307 static MemTxResult vtd_mem_ir_write(void *opaque, hwaddr addr, 3308 uint64_t value, unsigned size, 3309 MemTxAttrs attrs) 3310 { 3311 int ret = 0; 3312 MSIMessage from = {}, to = {}; 3313 uint16_t sid = X86_IOMMU_SID_INVALID; 3314 3315 from.address = (uint64_t) addr + VTD_INTERRUPT_ADDR_FIRST; 3316 from.data = (uint32_t) value; 3317 3318 if (!attrs.unspecified) { 3319 /* We have explicit Source ID */ 3320 sid = attrs.requester_id; 3321 } 3322 3323 ret = vtd_interrupt_remap_msi(opaque, &from, &to, sid); 3324 if (ret) { 3325 /* TODO: report error */ 3326 /* Drop this interrupt */ 3327 return MEMTX_ERROR; 3328 } 3329 3330 apic_get_class()->send_msi(&to); 3331 3332 return MEMTX_OK; 3333 } 3334 3335 static const MemoryRegionOps vtd_mem_ir_ops = { 3336 .read_with_attrs = vtd_mem_ir_read, 3337 .write_with_attrs = vtd_mem_ir_write, 3338 .endianness = DEVICE_LITTLE_ENDIAN, 3339 .impl = { 3340 .min_access_size = 4, 3341 .max_access_size = 4, 3342 }, 3343 .valid = { 3344 .min_access_size = 4, 3345 .max_access_size = 4, 3346 }, 3347 }; 3348 3349 VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn) 3350 { 3351 uintptr_t key = (uintptr_t)bus; 3352 VTDBus *vtd_bus = g_hash_table_lookup(s->vtd_as_by_busptr, &key); 3353 VTDAddressSpace *vtd_dev_as; 3354 char name[128]; 3355 3356 if (!vtd_bus) { 3357 uintptr_t *new_key = g_malloc(sizeof(*new_key)); 3358 *new_key = (uintptr_t)bus; 3359 /* No corresponding free() */ 3360 vtd_bus = g_malloc0(sizeof(VTDBus) + sizeof(VTDAddressSpace *) * \ 3361 PCI_DEVFN_MAX); 3362 vtd_bus->bus = bus; 3363 g_hash_table_insert(s->vtd_as_by_busptr, new_key, vtd_bus); 3364 } 3365 3366 vtd_dev_as = vtd_bus->dev_as[devfn]; 3367 3368 if (!vtd_dev_as) { 3369 snprintf(name, sizeof(name), "vtd-%02x.%x", PCI_SLOT(devfn), 3370 PCI_FUNC(devfn)); 3371 vtd_bus->dev_as[devfn] = vtd_dev_as = g_malloc0(sizeof(VTDAddressSpace)); 3372 3373 vtd_dev_as->bus = bus; 3374 vtd_dev_as->devfn = (uint8_t)devfn; 3375 vtd_dev_as->iommu_state = s; 3376 vtd_dev_as->context_cache_entry.context_cache_gen = 0; 3377 vtd_dev_as->iova_tree = iova_tree_new(); 3378 3379 memory_region_init(&vtd_dev_as->root, OBJECT(s), name, UINT64_MAX); 3380 address_space_init(&vtd_dev_as->as, &vtd_dev_as->root, "vtd-root"); 3381 3382 /* 3383 * Build the DMAR-disabled container with aliases to the 3384 * shared MRs. Note that aliasing to a shared memory region 3385 * could help the memory API to detect same FlatViews so we 3386 * can have devices to share the same FlatView when DMAR is 3387 * disabled (either by not providing "intel_iommu=on" or with 3388 * "iommu=pt"). It will greatly reduce the total number of 3389 * FlatViews of the system hence VM runs faster. 3390 */ 3391 memory_region_init_alias(&vtd_dev_as->nodmar, OBJECT(s), 3392 "vtd-nodmar", &s->mr_nodmar, 0, 3393 memory_region_size(&s->mr_nodmar)); 3394 3395 /* 3396 * Build the per-device DMAR-enabled container. 3397 * 3398 * TODO: currently we have per-device IOMMU memory region only 3399 * because we have per-device IOMMU notifiers for devices. If 3400 * one day we can abstract the IOMMU notifiers out of the 3401 * memory regions then we can also share the same memory 3402 * region here just like what we've done above with the nodmar 3403 * region. 3404 */ 3405 strcat(name, "-dmar"); 3406 memory_region_init_iommu(&vtd_dev_as->iommu, sizeof(vtd_dev_as->iommu), 3407 TYPE_INTEL_IOMMU_MEMORY_REGION, OBJECT(s), 3408 name, UINT64_MAX); 3409 memory_region_init_alias(&vtd_dev_as->iommu_ir, OBJECT(s), "vtd-ir", 3410 &s->mr_ir, 0, memory_region_size(&s->mr_ir)); 3411 memory_region_add_subregion_overlap(MEMORY_REGION(&vtd_dev_as->iommu), 3412 VTD_INTERRUPT_ADDR_FIRST, 3413 &vtd_dev_as->iommu_ir, 1); 3414 3415 /* 3416 * Hook both the containers under the root container, we 3417 * switch between DMAR & noDMAR by enable/disable 3418 * corresponding sub-containers 3419 */ 3420 memory_region_add_subregion_overlap(&vtd_dev_as->root, 0, 3421 MEMORY_REGION(&vtd_dev_as->iommu), 3422 0); 3423 memory_region_add_subregion_overlap(&vtd_dev_as->root, 0, 3424 &vtd_dev_as->nodmar, 0); 3425 3426 vtd_switch_address_space(vtd_dev_as); 3427 } 3428 return vtd_dev_as; 3429 } 3430 3431 static uint64_t get_naturally_aligned_size(uint64_t start, 3432 uint64_t size, int gaw) 3433 { 3434 uint64_t max_mask = 1ULL << gaw; 3435 uint64_t alignment = start ? start & -start : max_mask; 3436 3437 alignment = MIN(alignment, max_mask); 3438 size = MIN(size, max_mask); 3439 3440 if (alignment <= size) { 3441 /* Increase the alignment of start */ 3442 return alignment; 3443 } else { 3444 /* Find the largest page mask from size */ 3445 return 1ULL << (63 - clz64(size)); 3446 } 3447 } 3448 3449 /* Unmap the whole range in the notifier's scope. */ 3450 static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n) 3451 { 3452 hwaddr size, remain; 3453 hwaddr start = n->start; 3454 hwaddr end = n->end; 3455 IntelIOMMUState *s = as->iommu_state; 3456 DMAMap map; 3457 3458 /* 3459 * Note: all the codes in this function has a assumption that IOVA 3460 * bits are no more than VTD_MGAW bits (which is restricted by 3461 * VT-d spec), otherwise we need to consider overflow of 64 bits. 3462 */ 3463 3464 if (end > VTD_ADDRESS_SIZE(s->aw_bits) - 1) { 3465 /* 3466 * Don't need to unmap regions that is bigger than the whole 3467 * VT-d supported address space size 3468 */ 3469 end = VTD_ADDRESS_SIZE(s->aw_bits) - 1; 3470 } 3471 3472 assert(start <= end); 3473 size = remain = end - start + 1; 3474 3475 while (remain >= VTD_PAGE_SIZE) { 3476 IOMMUTLBEntry entry; 3477 uint64_t mask = get_naturally_aligned_size(start, remain, s->aw_bits); 3478 3479 assert(mask); 3480 3481 entry.iova = start; 3482 entry.addr_mask = mask - 1; 3483 entry.target_as = &address_space_memory; 3484 entry.perm = IOMMU_NONE; 3485 /* This field is meaningless for unmap */ 3486 entry.translated_addr = 0; 3487 3488 memory_region_notify_one(n, &entry); 3489 3490 start += mask; 3491 remain -= mask; 3492 } 3493 3494 assert(!remain); 3495 3496 trace_vtd_as_unmap_whole(pci_bus_num(as->bus), 3497 VTD_PCI_SLOT(as->devfn), 3498 VTD_PCI_FUNC(as->devfn), 3499 n->start, size); 3500 3501 map.iova = n->start; 3502 map.size = size; 3503 iova_tree_remove(as->iova_tree, &map); 3504 } 3505 3506 static void vtd_address_space_unmap_all(IntelIOMMUState *s) 3507 { 3508 VTDAddressSpace *vtd_as; 3509 IOMMUNotifier *n; 3510 3511 QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) { 3512 IOMMU_NOTIFIER_FOREACH(n, &vtd_as->iommu) { 3513 vtd_address_space_unmap(vtd_as, n); 3514 } 3515 } 3516 } 3517 3518 static void vtd_address_space_refresh_all(IntelIOMMUState *s) 3519 { 3520 vtd_address_space_unmap_all(s); 3521 vtd_switch_address_space_all(s); 3522 } 3523 3524 static int vtd_replay_hook(IOMMUTLBEntry *entry, void *private) 3525 { 3526 memory_region_notify_one((IOMMUNotifier *)private, entry); 3527 return 0; 3528 } 3529 3530 static void vtd_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n) 3531 { 3532 VTDAddressSpace *vtd_as = container_of(iommu_mr, VTDAddressSpace, iommu); 3533 IntelIOMMUState *s = vtd_as->iommu_state; 3534 uint8_t bus_n = pci_bus_num(vtd_as->bus); 3535 VTDContextEntry ce; 3536 3537 /* 3538 * The replay can be triggered by either a invalidation or a newly 3539 * created entry. No matter what, we release existing mappings 3540 * (it means flushing caches for UNMAP-only registers). 3541 */ 3542 vtd_address_space_unmap(vtd_as, n); 3543 3544 if (vtd_dev_to_context_entry(s, bus_n, vtd_as->devfn, &ce) == 0) { 3545 trace_vtd_replay_ce_valid(s->root_scalable ? "scalable mode" : 3546 "legacy mode", 3547 bus_n, PCI_SLOT(vtd_as->devfn), 3548 PCI_FUNC(vtd_as->devfn), 3549 vtd_get_domain_id(s, &ce), 3550 ce.hi, ce.lo); 3551 if (vtd_as_has_map_notifier(vtd_as)) { 3552 /* This is required only for MAP typed notifiers */ 3553 vtd_page_walk_info info = { 3554 .hook_fn = vtd_replay_hook, 3555 .private = (void *)n, 3556 .notify_unmap = false, 3557 .aw = s->aw_bits, 3558 .as = vtd_as, 3559 .domain_id = vtd_get_domain_id(s, &ce), 3560 }; 3561 3562 vtd_page_walk(s, &ce, 0, ~0ULL, &info); 3563 } 3564 } else { 3565 trace_vtd_replay_ce_invalid(bus_n, PCI_SLOT(vtd_as->devfn), 3566 PCI_FUNC(vtd_as->devfn)); 3567 } 3568 3569 return; 3570 } 3571 3572 /* Do the initialization. It will also be called when reset, so pay 3573 * attention when adding new initialization stuff. 3574 */ 3575 static void vtd_init(IntelIOMMUState *s) 3576 { 3577 X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s); 3578 3579 memset(s->csr, 0, DMAR_REG_SIZE); 3580 memset(s->wmask, 0, DMAR_REG_SIZE); 3581 memset(s->w1cmask, 0, DMAR_REG_SIZE); 3582 memset(s->womask, 0, DMAR_REG_SIZE); 3583 3584 s->root = 0; 3585 s->root_scalable = false; 3586 s->dmar_enabled = false; 3587 s->intr_enabled = false; 3588 s->iq_head = 0; 3589 s->iq_tail = 0; 3590 s->iq = 0; 3591 s->iq_size = 0; 3592 s->qi_enabled = false; 3593 s->iq_last_desc_type = VTD_INV_DESC_NONE; 3594 s->iq_dw = false; 3595 s->next_frcd_reg = 0; 3596 s->cap = VTD_CAP_FRO | VTD_CAP_NFR | VTD_CAP_ND | 3597 VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SLLPS | 3598 VTD_CAP_SAGAW_39bit | VTD_CAP_MGAW(s->aw_bits); 3599 if (s->dma_drain) { 3600 s->cap |= VTD_CAP_DRAIN; 3601 } 3602 if (s->aw_bits == VTD_HOST_AW_48BIT) { 3603 s->cap |= VTD_CAP_SAGAW_48bit; 3604 } 3605 s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO; 3606 3607 /* 3608 * Rsvd field masks for spte 3609 */ 3610 vtd_spte_rsvd[0] = ~0ULL; 3611 vtd_spte_rsvd[1] = VTD_SPTE_PAGE_L1_RSVD_MASK(s->aw_bits, 3612 x86_iommu->dt_supported); 3613 vtd_spte_rsvd[2] = VTD_SPTE_PAGE_L2_RSVD_MASK(s->aw_bits); 3614 vtd_spte_rsvd[3] = VTD_SPTE_PAGE_L3_RSVD_MASK(s->aw_bits); 3615 vtd_spte_rsvd[4] = VTD_SPTE_PAGE_L4_RSVD_MASK(s->aw_bits); 3616 3617 vtd_spte_rsvd_large[2] = VTD_SPTE_LPAGE_L2_RSVD_MASK(s->aw_bits, 3618 x86_iommu->dt_supported); 3619 vtd_spte_rsvd_large[3] = VTD_SPTE_LPAGE_L3_RSVD_MASK(s->aw_bits, 3620 x86_iommu->dt_supported); 3621 3622 if (x86_iommu_ir_supported(x86_iommu)) { 3623 s->ecap |= VTD_ECAP_IR | VTD_ECAP_MHMV; 3624 if (s->intr_eim == ON_OFF_AUTO_ON) { 3625 s->ecap |= VTD_ECAP_EIM; 3626 } 3627 assert(s->intr_eim != ON_OFF_AUTO_AUTO); 3628 } 3629 3630 if (x86_iommu->dt_supported) { 3631 s->ecap |= VTD_ECAP_DT; 3632 } 3633 3634 if (x86_iommu->pt_supported) { 3635 s->ecap |= VTD_ECAP_PT; 3636 } 3637 3638 if (s->caching_mode) { 3639 s->cap |= VTD_CAP_CM; 3640 } 3641 3642 /* TODO: read cap/ecap from host to decide which cap to be exposed. */ 3643 if (s->scalable_mode) { 3644 s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_SRS | VTD_ECAP_SLTS; 3645 } 3646 3647 vtd_reset_caches(s); 3648 3649 /* Define registers with default values and bit semantics */ 3650 vtd_define_long(s, DMAR_VER_REG, 0x10UL, 0, 0); 3651 vtd_define_quad(s, DMAR_CAP_REG, s->cap, 0, 0); 3652 vtd_define_quad(s, DMAR_ECAP_REG, s->ecap, 0, 0); 3653 vtd_define_long(s, DMAR_GCMD_REG, 0, 0xff800000UL, 0); 3654 vtd_define_long_wo(s, DMAR_GCMD_REG, 0xff800000UL); 3655 vtd_define_long(s, DMAR_GSTS_REG, 0, 0, 0); 3656 vtd_define_quad(s, DMAR_RTADDR_REG, 0, 0xfffffffffffffc00ULL, 0); 3657 vtd_define_quad(s, DMAR_CCMD_REG, 0, 0xe0000003ffffffffULL, 0); 3658 vtd_define_quad_wo(s, DMAR_CCMD_REG, 0x3ffff0000ULL); 3659 3660 /* Advanced Fault Logging not supported */ 3661 vtd_define_long(s, DMAR_FSTS_REG, 0, 0, 0x11UL); 3662 vtd_define_long(s, DMAR_FECTL_REG, 0x80000000UL, 0x80000000UL, 0); 3663 vtd_define_long(s, DMAR_FEDATA_REG, 0, 0x0000ffffUL, 0); 3664 vtd_define_long(s, DMAR_FEADDR_REG, 0, 0xfffffffcUL, 0); 3665 3666 /* Treated as RsvdZ when EIM in ECAP_REG is not supported 3667 * vtd_define_long(s, DMAR_FEUADDR_REG, 0, 0xffffffffUL, 0); 3668 */ 3669 vtd_define_long(s, DMAR_FEUADDR_REG, 0, 0, 0); 3670 3671 /* Treated as RO for implementations that PLMR and PHMR fields reported 3672 * as Clear in the CAP_REG. 3673 * vtd_define_long(s, DMAR_PMEN_REG, 0, 0x80000000UL, 0); 3674 */ 3675 vtd_define_long(s, DMAR_PMEN_REG, 0, 0, 0); 3676 3677 vtd_define_quad(s, DMAR_IQH_REG, 0, 0, 0); 3678 vtd_define_quad(s, DMAR_IQT_REG, 0, 0x7fff0ULL, 0); 3679 vtd_define_quad(s, DMAR_IQA_REG, 0, 0xfffffffffffff807ULL, 0); 3680 vtd_define_long(s, DMAR_ICS_REG, 0, 0, 0x1UL); 3681 vtd_define_long(s, DMAR_IECTL_REG, 0x80000000UL, 0x80000000UL, 0); 3682 vtd_define_long(s, DMAR_IEDATA_REG, 0, 0xffffffffUL, 0); 3683 vtd_define_long(s, DMAR_IEADDR_REG, 0, 0xfffffffcUL, 0); 3684 /* Treadted as RsvdZ when EIM in ECAP_REG is not supported */ 3685 vtd_define_long(s, DMAR_IEUADDR_REG, 0, 0, 0); 3686 3687 /* IOTLB registers */ 3688 vtd_define_quad(s, DMAR_IOTLB_REG, 0, 0Xb003ffff00000000ULL, 0); 3689 vtd_define_quad(s, DMAR_IVA_REG, 0, 0xfffffffffffff07fULL, 0); 3690 vtd_define_quad_wo(s, DMAR_IVA_REG, 0xfffffffffffff07fULL); 3691 3692 /* Fault Recording Registers, 128-bit */ 3693 vtd_define_quad(s, DMAR_FRCD_REG_0_0, 0, 0, 0); 3694 vtd_define_quad(s, DMAR_FRCD_REG_0_2, 0, 0, 0x8000000000000000ULL); 3695 3696 /* 3697 * Interrupt remapping registers. 3698 */ 3699 vtd_define_quad(s, DMAR_IRTA_REG, 0, 0xfffffffffffff80fULL, 0); 3700 } 3701 3702 /* Should not reset address_spaces when reset because devices will still use 3703 * the address space they got at first (won't ask the bus again). 3704 */ 3705 static void vtd_reset(DeviceState *dev) 3706 { 3707 IntelIOMMUState *s = INTEL_IOMMU_DEVICE(dev); 3708 3709 vtd_init(s); 3710 vtd_address_space_refresh_all(s); 3711 } 3712 3713 static AddressSpace *vtd_host_dma_iommu(PCIBus *bus, void *opaque, int devfn) 3714 { 3715 IntelIOMMUState *s = opaque; 3716 VTDAddressSpace *vtd_as; 3717 3718 assert(0 <= devfn && devfn < PCI_DEVFN_MAX); 3719 3720 vtd_as = vtd_find_add_as(s, bus, devfn); 3721 return &vtd_as->as; 3722 } 3723 3724 static bool vtd_decide_config(IntelIOMMUState *s, Error **errp) 3725 { 3726 X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s); 3727 3728 if (s->intr_eim == ON_OFF_AUTO_ON && !x86_iommu_ir_supported(x86_iommu)) { 3729 error_setg(errp, "eim=on cannot be selected without intremap=on"); 3730 return false; 3731 } 3732 3733 if (s->intr_eim == ON_OFF_AUTO_AUTO) { 3734 s->intr_eim = (kvm_irqchip_in_kernel() || s->buggy_eim) 3735 && x86_iommu_ir_supported(x86_iommu) ? 3736 ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; 3737 } 3738 if (s->intr_eim == ON_OFF_AUTO_ON && !s->buggy_eim) { 3739 if (!kvm_irqchip_in_kernel()) { 3740 error_setg(errp, "eim=on requires accel=kvm,kernel-irqchip=split"); 3741 return false; 3742 } 3743 if (!kvm_enable_x2apic()) { 3744 error_setg(errp, "eim=on requires support on the KVM side" 3745 "(X2APIC_API, first shipped in v4.7)"); 3746 return false; 3747 } 3748 } 3749 3750 /* Currently only address widths supported are 39 and 48 bits */ 3751 if ((s->aw_bits != VTD_HOST_AW_39BIT) && 3752 (s->aw_bits != VTD_HOST_AW_48BIT)) { 3753 error_setg(errp, "Supported values for x-aw-bits are: %d, %d", 3754 VTD_HOST_AW_39BIT, VTD_HOST_AW_48BIT); 3755 return false; 3756 } 3757 3758 if (s->scalable_mode && !s->dma_drain) { 3759 error_setg(errp, "Need to set dma_drain for scalable mode"); 3760 return false; 3761 } 3762 3763 return true; 3764 } 3765 3766 static int vtd_machine_done_notify_one(Object *child, void *unused) 3767 { 3768 IntelIOMMUState *iommu = INTEL_IOMMU_DEVICE(x86_iommu_get_default()); 3769 3770 /* 3771 * We hard-coded here because vfio-pci is the only special case 3772 * here. Let's be more elegant in the future when we can, but so 3773 * far there seems to be no better way. 3774 */ 3775 if (object_dynamic_cast(child, "vfio-pci") && !iommu->caching_mode) { 3776 vtd_panic_require_caching_mode(); 3777 } 3778 3779 return 0; 3780 } 3781 3782 static void vtd_machine_done_hook(Notifier *notifier, void *unused) 3783 { 3784 object_child_foreach_recursive(object_get_root(), 3785 vtd_machine_done_notify_one, NULL); 3786 } 3787 3788 static Notifier vtd_machine_done_notify = { 3789 .notify = vtd_machine_done_hook, 3790 }; 3791 3792 static void vtd_realize(DeviceState *dev, Error **errp) 3793 { 3794 MachineState *ms = MACHINE(qdev_get_machine()); 3795 PCMachineState *pcms = PC_MACHINE(ms); 3796 X86MachineState *x86ms = X86_MACHINE(ms); 3797 PCIBus *bus = pcms->bus; 3798 IntelIOMMUState *s = INTEL_IOMMU_DEVICE(dev); 3799 X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(dev); 3800 3801 x86_iommu->type = TYPE_INTEL; 3802 3803 if (!vtd_decide_config(s, errp)) { 3804 return; 3805 } 3806 3807 QLIST_INIT(&s->vtd_as_with_notifiers); 3808 qemu_mutex_init(&s->iommu_lock); 3809 memset(s->vtd_as_by_bus_num, 0, sizeof(s->vtd_as_by_bus_num)); 3810 memory_region_init_io(&s->csrmem, OBJECT(s), &vtd_mem_ops, s, 3811 "intel_iommu", DMAR_REG_SIZE); 3812 3813 /* Create the shared memory regions by all devices */ 3814 memory_region_init(&s->mr_nodmar, OBJECT(s), "vtd-nodmar", 3815 UINT64_MAX); 3816 memory_region_init_io(&s->mr_ir, OBJECT(s), &vtd_mem_ir_ops, 3817 s, "vtd-ir", VTD_INTERRUPT_ADDR_SIZE); 3818 memory_region_init_alias(&s->mr_sys_alias, OBJECT(s), 3819 "vtd-sys-alias", get_system_memory(), 0, 3820 memory_region_size(get_system_memory())); 3821 memory_region_add_subregion_overlap(&s->mr_nodmar, 0, 3822 &s->mr_sys_alias, 0); 3823 memory_region_add_subregion_overlap(&s->mr_nodmar, 3824 VTD_INTERRUPT_ADDR_FIRST, 3825 &s->mr_ir, 1); 3826 3827 sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->csrmem); 3828 /* No corresponding destroy */ 3829 s->iotlb = g_hash_table_new_full(vtd_uint64_hash, vtd_uint64_equal, 3830 g_free, g_free); 3831 s->vtd_as_by_busptr = g_hash_table_new_full(vtd_uint64_hash, vtd_uint64_equal, 3832 g_free, g_free); 3833 vtd_init(s); 3834 sysbus_mmio_map(SYS_BUS_DEVICE(s), 0, Q35_HOST_BRIDGE_IOMMU_ADDR); 3835 pci_setup_iommu(bus, vtd_host_dma_iommu, dev); 3836 /* Pseudo address space under root PCI bus. */ 3837 x86ms->ioapic_as = vtd_host_dma_iommu(bus, s, Q35_PSEUDO_DEVFN_IOAPIC); 3838 qemu_add_machine_init_done_notifier(&vtd_machine_done_notify); 3839 } 3840 3841 static void vtd_class_init(ObjectClass *klass, void *data) 3842 { 3843 DeviceClass *dc = DEVICE_CLASS(klass); 3844 X86IOMMUClass *x86_class = X86_IOMMU_CLASS(klass); 3845 3846 dc->reset = vtd_reset; 3847 dc->vmsd = &vtd_vmstate; 3848 dc->props = vtd_properties; 3849 dc->hotpluggable = false; 3850 x86_class->realize = vtd_realize; 3851 x86_class->int_remap = vtd_int_remap; 3852 /* Supported by the pc-q35-* machine types */ 3853 dc->user_creatable = true; 3854 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 3855 dc->desc = "Intel IOMMU (VT-d) DMA Remapping device"; 3856 } 3857 3858 static const TypeInfo vtd_info = { 3859 .name = TYPE_INTEL_IOMMU_DEVICE, 3860 .parent = TYPE_X86_IOMMU_DEVICE, 3861 .instance_size = sizeof(IntelIOMMUState), 3862 .class_init = vtd_class_init, 3863 }; 3864 3865 static void vtd_iommu_memory_region_class_init(ObjectClass *klass, 3866 void *data) 3867 { 3868 IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass); 3869 3870 imrc->translate = vtd_iommu_translate; 3871 imrc->notify_flag_changed = vtd_iommu_notify_flag_changed; 3872 imrc->replay = vtd_iommu_replay; 3873 } 3874 3875 static const TypeInfo vtd_iommu_memory_region_info = { 3876 .parent = TYPE_IOMMU_MEMORY_REGION, 3877 .name = TYPE_INTEL_IOMMU_MEMORY_REGION, 3878 .class_init = vtd_iommu_memory_region_class_init, 3879 }; 3880 3881 static void vtd_register_types(void) 3882 { 3883 type_register_static(&vtd_info); 3884 type_register_static(&vtd_iommu_memory_region_info); 3885 } 3886 3887 type_init(vtd_register_types) 3888