hw/xen/xen_pt_msi.c

   1 /*
   2  * Copyright (c) 2007, Intel Corporation.
   3  *
   4  * This work is licensed under the terms of the GNU GPL, version 2.  See
   5  * the COPYING file in the top-level directory.
   6  *
   7  * Jiang Yunhong <yunhong.jiang@intel.com>
   8  *
   9  * This file implements direct PCI assignment to a HVM guest
  10  */
  11
  12 #include "qemu/osdep.h"
  13
  14 #include "hw/xen/xen-legacy-backend.h"
  15 #include "xen_pt.h"
  16 #include "hw/i386/apic-msidef.h"
  17
  18
  19 #define XEN_PT_AUTO_ASSIGN -1
  20
  21 /* shift count for gflags */
  22 #define XEN_PT_GFLAGS_SHIFT_DEST_ID        0
  23 #define XEN_PT_GFLAGS_SHIFT_RH             8
  24 #define XEN_PT_GFLAGS_SHIFT_DM             9
  25 #define XEN_PT_GFLAGSSHIFT_DELIV_MODE     12
  26 #define XEN_PT_GFLAGSSHIFT_TRG_MODE       15
  27 #define XEN_PT_GFLAGSSHIFT_UNMASKED       16
  28
  29 #define latch(fld) latch[PCI_MSIX_ENTRY_##fld / sizeof(uint32_t)]
  30
  31 /*
  32  * Helpers
  33  */
  34
  35 static inline uint8_t msi_vector(uint32_t data)
  36 {
  37     return (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
  38 }
  39
  40 static inline uint8_t msi_dest_id(uint32_t addr)
  41 {
  42     return (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
  43 }
  44
  45 static inline uint32_t msi_ext_dest_id(uint32_t addr_hi)
  46 {
  47     return addr_hi & 0xffffff00;
  48 }
  49
  50 static uint32_t msi_gflags(uint32_t data, uint64_t addr)
  51 {
  52     uint32_t result = 0;
  53     int rh, dm, dest_id, deliv_mode, trig_mode;
  54
  55     rh = (addr >> MSI_ADDR_REDIRECTION_SHIFT) & 0x1;
  56     dm = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
  57     dest_id = msi_dest_id(addr);
  58     deliv_mode = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) & 0x7;
  59     trig_mode = (data >> MSI_DATA_TRIGGER_SHIFT) & 0x1;
  60
  61     result = dest_id | (rh << XEN_PT_GFLAGS_SHIFT_RH)
  62         | (dm << XEN_PT_GFLAGS_SHIFT_DM)
  63         | (deliv_mode << XEN_PT_GFLAGSSHIFT_DELIV_MODE)
  64         | (trig_mode << XEN_PT_GFLAGSSHIFT_TRG_MODE);
  65
  66     return result;
  67 }
  68
  69 static inline uint64_t msi_addr64(XenPTMSI *msi)
  70 {
  71     return (uint64_t)msi->addr_hi << 32 | msi->addr_lo;
  72 }
  73
  74 static int msi_msix_enable(XenPCIPassthroughState *s,
  75                            uint32_t address,
  76                            uint16_t flag,
  77                            bool enable)
  78 {
  79     uint16_t val = 0;
  80     int rc;
  81
  82     if (!address) {
  83         return -1;
  84     }
  85
  86     rc = xen_host_pci_get_word(&s->real_device, address, &val);
  87     if (rc) {
  88         XEN_PT_ERR(&s->dev, "Failed to read MSI/MSI-X register (0x%x), rc:%d\n",
  89                    address, rc);
  90         return rc;
  91     }
  92     if (enable) {
  93         val |= flag;
  94     } else {
  95         val &= ~flag;
  96     }
  97     rc = xen_host_pci_set_word(&s->real_device, address, val);
  98     if (rc) {
  99         XEN_PT_ERR(&s->dev, "Failed to write MSI/MSI-X register (0x%x), rc:%d\n",
 100                    address, rc);
 101     }
 102     return rc;
 103 }
 104
 105 static int msi_msix_setup(XenPCIPassthroughState *s,
 106                           uint64_t addr,
 107                           uint32_t data,
 108                           int *ppirq,
 109                           bool is_msix,
 110                           int msix_entry,
 111                           bool is_not_mapped)
 112 {
 113     uint8_t gvec = msi_vector(data);
 114     int rc = 0;
 115
 116     assert((!is_msix && msix_entry == 0) || is_msix);
 117
 118     if (xen_is_pirq_msi(data)) {
 119         *ppirq = msi_ext_dest_id(addr >> 32) | msi_dest_id(addr);
 120         if (!*ppirq) {
 121             /* this probably identifies an misconfiguration of the guest,
 122              * try the emulated path */
 123             *ppirq = XEN_PT_UNASSIGNED_PIRQ;
 124         } else {
 125             XEN_PT_LOG(&s->dev, "requested pirq %d for MSI%s"
 126                        " (vec: 0x%x, entry: 0x%x)\n",
 127                        *ppirq, is_msix ? "-X" : "", gvec, msix_entry);
 128         }
 129     }
 130
 131     if (is_not_mapped) {
 132         uint64_t table_base = 0;
 133
 134         if (is_msix) {
 135             table_base = s->msix->table_base;
 136         }
 137
 138         rc = xc_physdev_map_pirq_msi(xen_xc, xen_domid, XEN_PT_AUTO_ASSIGN,
 139                                      ppirq, PCI_DEVFN(s->real_device.dev,
 140                                                       s->real_device.func),
 141                                      s->real_device.bus,
 142                                      msix_entry, table_base);
 143         if (rc) {
 144             XEN_PT_ERR(&s->dev,
 145                        "Mapping of MSI%s (err: %i, vec: 0x%x, entry 0x%x)\n",
 146                        is_msix ? "-X" : "", errno, gvec, msix_entry);
 147             return rc;
 148         }
 149     }
 150
 151     return 0;
 152 }
 153 static int msi_msix_update(XenPCIPassthroughState *s,
 154                            uint64_t addr,
 155                            uint32_t data,
 156                            int pirq,
 157                            bool is_msix,
 158                            int msix_entry,
 159                            int *old_pirq,
 160                            bool masked)
 161 {
 162     PCIDevice *d = &s->dev;
 163     uint8_t gvec = msi_vector(data);
 164     uint32_t gflags = msi_gflags(data, addr);
 165     int rc = 0;
 166     uint64_t table_addr = 0;
 167
 168     XEN_PT_LOG(d, "Updating MSI%s with pirq %d gvec 0x%x gflags 0x%x"
 169                " (entry: 0x%x)\n",
 170                is_msix ? "-X" : "", pirq, gvec, gflags, msix_entry);
 171
 172     if (is_msix) {
 173         table_addr = s->msix->mmio_base_addr;
 174     }
 175
 176     gflags |= masked ? 0 : (1u << XEN_PT_GFLAGSSHIFT_UNMASKED);
 177
 178     rc = xc_domain_update_msi_irq(xen_xc, xen_domid, gvec,
 179                                   pirq, gflags, table_addr);
 180
 181     if (rc) {
 182         XEN_PT_ERR(d, "Updating of MSI%s failed. (err: %d)\n",
 183                    is_msix ? "-X" : "", errno);
 184
 185         if (xc_physdev_unmap_pirq(xen_xc, xen_domid, *old_pirq)) {
 186             XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (err: %d)\n",
 187                        is_msix ? "-X" : "", *old_pirq, errno);
 188         }
 189         *old_pirq = XEN_PT_UNASSIGNED_PIRQ;
 190     }
 191     return rc;
 192 }
 193
 194 static int msi_msix_disable(XenPCIPassthroughState *s,
 195                             uint64_t addr,
 196                             uint32_t data,
 197                             int pirq,
 198                             bool is_msix,
 199                             bool is_binded)
 200 {
 201     PCIDevice *d = &s->dev;
 202     uint8_t gvec = msi_vector(data);
 203     uint32_t gflags = msi_gflags(data, addr);
 204     int rc = 0;
 205
 206     if (pirq == XEN_PT_UNASSIGNED_PIRQ) {
 207         return 0;
 208     }
 209
 210     if (is_binded) {
 211         XEN_PT_LOG(d, "Unbind MSI%s with pirq %d, gvec 0x%x\n",
 212                    is_msix ? "-X" : "", pirq, gvec);
 213         rc = xc_domain_unbind_msi_irq(xen_xc, xen_domid, gvec, pirq, gflags);
 214         if (rc) {
 215             XEN_PT_ERR(d, "Unbinding of MSI%s failed. (err: %d, pirq: %d, gvec: 0x%x)\n",
 216                        is_msix ? "-X" : "", errno, pirq, gvec);
 217             return rc;
 218         }
 219     }
 220
 221     XEN_PT_LOG(d, "Unmap MSI%s pirq %d\n", is_msix ? "-X" : "", pirq);
 222     rc = xc_physdev_unmap_pirq(xen_xc, xen_domid, pirq);
 223     if (rc) {
 224         XEN_PT_ERR(d, "Unmapping of MSI%s pirq %d failed. (err: %i)\n",
 225                    is_msix ? "-X" : "", pirq, errno);
 226         return rc;
 227     }
 228
 229     return 0;
 230 }
 231
 232 /*
 233  * MSI virtualization functions
 234  */
 235
 236 static int xen_pt_msi_set_enable(XenPCIPassthroughState *s, bool enable)
 237 {
 238     XEN_PT_LOG(&s->dev, "%s MSI.\n", enable ? "enabling" : "disabling");
 239
 240     if (!s->msi) {
 241         return -1;
 242     }
 243
 244     return msi_msix_enable(s, s->msi->ctrl_offset, PCI_MSI_FLAGS_ENABLE,
 245                            enable);
 246 }
 247
 248 /* setup physical msi, but don't enable it */
 249 int xen_pt_msi_setup(XenPCIPassthroughState *s)
 250 {
 251     int pirq = XEN_PT_UNASSIGNED_PIRQ;
 252     int rc = 0;
 253     XenPTMSI *msi = s->msi;
 254
 255     if (msi->initialized) {
 256         XEN_PT_ERR(&s->dev,
 257                    "Setup physical MSI when it has been properly initialized.\n");
 258         return -1;
 259     }
 260
 261     rc = msi_msix_setup(s, msi_addr64(msi), msi->data, &pirq, false, 0, true);
 262     if (rc) {
 263         return rc;
 264     }
 265
 266     if (pirq < 0) {
 267         XEN_PT_ERR(&s->dev, "Invalid pirq number: %d.\n", pirq);
 268         return -1;
 269     }
 270
 271     msi->pirq = pirq;
 272     XEN_PT_LOG(&s->dev, "MSI mapped with pirq %d.\n", pirq);
 273
 274     return 0;
 275 }
 276
 277 int xen_pt_msi_update(XenPCIPassthroughState *s)
 278 {
 279     XenPTMSI *msi = s->msi;
 280
 281     /* Current MSI emulation in QEMU only supports 1 vector */
 282     return msi_msix_update(s, msi_addr64(msi), msi->data, msi->pirq,
 283                            false, 0, &msi->pirq, msi->mask & 1);
 284 }
 285
 286 void xen_pt_msi_disable(XenPCIPassthroughState *s)
 287 {
 288     XenPTMSI *msi = s->msi;
 289
 290     if (!msi) {
 291         return;
 292     }
 293
 294     (void)xen_pt_msi_set_enable(s, false);
 295
 296     msi_msix_disable(s, msi_addr64(msi), msi->data, msi->pirq, false,
 297                      msi->initialized);
 298
 299     /* clear msi info */
 300     msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
 301     msi->initialized = false;
 302     msi->mapped = false;
 303     msi->pirq = XEN_PT_UNASSIGNED_PIRQ;
 304 }
 305
 306 /*
 307  * MSI-X virtualization functions
 308  */
 309
 310 static int msix_set_enable(XenPCIPassthroughState *s, bool enabled)
 311 {
 312     XEN_PT_LOG(&s->dev, "%s MSI-X.\n", enabled ? "enabling" : "disabling");
 313
 314     if (!s->msix) {
 315         return -1;
 316     }
 317
 318     return msi_msix_enable(s, s->msix->ctrl_offset, PCI_MSIX_FLAGS_ENABLE,
 319                            enabled);
 320 }
 321
 322 static int xen_pt_msix_update_one(XenPCIPassthroughState *s, int entry_nr,
 323                                   uint32_t vec_ctrl)
 324 {
 325     XenPTMSIXEntry *entry = NULL;
 326     int pirq;
 327     int rc;
 328
 329     if (entry_nr < 0 || entry_nr >= s->msix->total_entries) {
 330         return -EINVAL;
 331     }
 332
 333     entry = &s->msix->msix_entry[entry_nr];
 334
 335     if (!entry->updated) {
 336         return 0;
 337     }
 338
 339     pirq = entry->pirq;
 340
 341     /*
 342      * Update the entry addr and data to the latest values only when the
 343      * entry is masked or they are all masked, as required by the spec.
 344      * Addr and data changes while the MSI-X entry is unmasked get deferred
 345      * until the next masked -> unmasked transition.
 346      */
 347     if (pirq == XEN_PT_UNASSIGNED_PIRQ || s->msix->maskall ||
 348         (vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
 349         entry->addr = entry->latch(LOWER_ADDR) |
 350                       ((uint64_t)entry->latch(UPPER_ADDR) << 32);
 351         entry->data = entry->latch(DATA);
 352     }
 353
 354     rc = msi_msix_setup(s, entry->addr, entry->data, &pirq, true, entry_nr,
 355                         entry->pirq == XEN_PT_UNASSIGNED_PIRQ);
 356     if (rc) {
 357         return rc;
 358     }
 359     if (entry->pirq == XEN_PT_UNASSIGNED_PIRQ) {
 360         entry->pirq = pirq;
 361     }
 362
 363     rc = msi_msix_update(s, entry->addr, entry->data, pirq, true,
 364                          entry_nr, &entry->pirq,
 365                          vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);
 366
 367     if (!rc) {
 368         entry->updated = false;
 369     }
 370
 371     return rc;
 372 }
 373
 374 int xen_pt_msix_update(XenPCIPassthroughState *s)
 375 {
 376     XenPTMSIX *msix = s->msix;
 377     int i;
 378
 379     for (i = 0; i < msix->total_entries; i++) {
 380         xen_pt_msix_update_one(s, i, msix->msix_entry[i].latch(VECTOR_CTRL));
 381     }
 382
 383     return 0;
 384 }
 385
 386 void xen_pt_msix_disable(XenPCIPassthroughState *s)
 387 {
 388     int i = 0;
 389
 390     msix_set_enable(s, false);
 391
 392     for (i = 0; i < s->msix->total_entries; i++) {
 393         XenPTMSIXEntry *entry = &s->msix->msix_entry[i];
 394
 395         msi_msix_disable(s, entry->addr, entry->data, entry->pirq, true, true);
 396
 397         /* clear MSI-X info */
 398         entry->pirq = XEN_PT_UNASSIGNED_PIRQ;
 399         entry->updated = false;
 400     }
 401 }
 402
 403 int xen_pt_msix_update_remap(XenPCIPassthroughState *s, int bar_index)
 404 {
 405     XenPTMSIXEntry *entry;
 406     int i, ret;
 407
 408     if (!(s->msix && s->msix->bar_index == bar_index)) {
 409         return 0;
 410     }
 411
 412     for (i = 0; i < s->msix->total_entries; i++) {
 413         entry = &s->msix->msix_entry[i];
 414         if (entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
 415             ret = xc_domain_unbind_pt_irq(xen_xc, xen_domid, entry->pirq,
 416                                           PT_IRQ_TYPE_MSI, 0, 0, 0, 0);
 417             if (ret) {
 418                 XEN_PT_ERR(&s->dev, "unbind MSI-X entry %d failed (err: %d)\n",
 419                            entry->pirq, errno);
 420             }
 421             entry->updated = true;
 422         }
 423     }
 424     return xen_pt_msix_update(s);
 425 }
 426
 427 static uint32_t get_entry_value(XenPTMSIXEntry *e, int offset)
 428 {
 429     assert(!(offset % sizeof(*e->latch)));
 430     return e->latch[offset / sizeof(*e->latch)];
 431 }
 432
 433 static void set_entry_value(XenPTMSIXEntry *e, int offset, uint32_t val)
 434 {
 435     assert(!(offset % sizeof(*e->latch)));
 436     e->latch[offset / sizeof(*e->latch)] = val;
 437 }
 438
 439 static void pci_msix_write(void *opaque, hwaddr addr,
 440                            uint64_t val, unsigned size)
 441 {
 442     XenPCIPassthroughState *s = opaque;
 443     XenPTMSIX *msix = s->msix;
 444     XenPTMSIXEntry *entry;
 445     unsigned int entry_nr, offset;
 446
 447     entry_nr = addr / PCI_MSIX_ENTRY_SIZE;
 448     if (entry_nr >= msix->total_entries) {
 449         return;
 450     }
 451     entry = &msix->msix_entry[entry_nr];
 452     offset = addr % PCI_MSIX_ENTRY_SIZE;
 453
 454     if (offset != PCI_MSIX_ENTRY_VECTOR_CTRL) {
 455         if (get_entry_value(entry, offset) == val
 456             && entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
 457             return;
 458         }
 459
 460         entry->updated = true;
 461     } else if (msix->enabled && entry->updated &&
 462                !(val & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
 463         const volatile uint32_t *vec_ctrl;
 464
 465         /*
 466          * If Xen intercepts the mask bit access, entry->vec_ctrl may not be
 467          * up-to-date. Read from hardware directly.
 468          */
 469         vec_ctrl = s->msix->phys_iomem_base + entry_nr * PCI_MSIX_ENTRY_SIZE
 470             + PCI_MSIX_ENTRY_VECTOR_CTRL;
 471         xen_pt_msix_update_one(s, entry_nr, *vec_ctrl);
 472     }
 473
 474     set_entry_value(entry, offset, val);
 475 }
 476
 477 static uint64_t pci_msix_read(void *opaque, hwaddr addr,
 478                               unsigned size)
 479 {
 480     XenPCIPassthroughState *s = opaque;
 481     XenPTMSIX *msix = s->msix;
 482     int entry_nr, offset;
 483
 484     entry_nr = addr / PCI_MSIX_ENTRY_SIZE;
 485     if (entry_nr < 0) {
 486         XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr);
 487         return 0;
 488     }
 489
 490     offset = addr % PCI_MSIX_ENTRY_SIZE;
 491
 492     if (addr < msix->total_entries * PCI_MSIX_ENTRY_SIZE) {
 493         return get_entry_value(&msix->msix_entry[entry_nr], offset);
 494     } else {
 495         /* Pending Bit Array (PBA) */
 496         return *(uint32_t *)(msix->phys_iomem_base + addr);
 497     }
 498 }
 499
 500 static bool pci_msix_accepts(void *opaque, hwaddr addr,
 501                              unsigned size, bool is_write,
 502                              MemTxAttrs attrs)
 503 {
 504     return !(addr & (size - 1));
 505 }
 506
 507 static const MemoryRegionOps pci_msix_ops = {
 508     .read = pci_msix_read,
 509     .write = pci_msix_write,
 510     .endianness = DEVICE_NATIVE_ENDIAN,
 511     .valid = {
 512         .min_access_size = 4,
 513         .max_access_size = 4,
 514         .unaligned = false,
 515         .accepts = pci_msix_accepts
 516     },
 517     .impl = {
 518         .min_access_size = 4,
 519         .max_access_size = 4,
 520         .unaligned = false
 521     }
 522 };
 523
 524 int xen_pt_msix_init(XenPCIPassthroughState *s, uint32_t base)
 525 {
 526     uint8_t id = 0;
 527     uint16_t control = 0;
 528     uint32_t table_off = 0;
 529     int i, total_entries, bar_index;
 530     XenHostPCIDevice *hd = &s->real_device;
 531     PCIDevice *d = &s->dev;
 532     int fd = -1;
 533     XenPTMSIX *msix = NULL;
 534     int rc = 0;
 535
 536     rc = xen_host_pci_get_byte(hd, base + PCI_CAP_LIST_ID, &id);
 537     if (rc) {
 538         return rc;
 539     }
 540
 541     if (id != PCI_CAP_ID_MSIX) {
 542         XEN_PT_ERR(d, "Invalid id 0x%x base 0x%x\n", id, base);
 543         return -1;
 544     }
 545
 546     rc = xen_host_pci_get_word(hd, base + PCI_MSIX_FLAGS, &control);
 547     if (rc) {
 548         XEN_PT_ERR(d, "Failed to read PCI_MSIX_FLAGS field\n");
 549         return rc;
 550     }
 551     total_entries = control & PCI_MSIX_FLAGS_QSIZE;
 552     total_entries += 1;
 553
 554     s->msix = g_malloc0(sizeof (XenPTMSIX)
 555                         + total_entries * sizeof (XenPTMSIXEntry));
 556     msix = s->msix;
 557
 558     msix->total_entries = total_entries;
 559     for (i = 0; i < total_entries; i++) {
 560         msix->msix_entry[i].pirq = XEN_PT_UNASSIGNED_PIRQ;
 561     }
 562
 563     memory_region_init_io(&msix->mmio, OBJECT(s), &pci_msix_ops,
 564                           s, "xen-pci-pt-msix",
 565                           (total_entries * PCI_MSIX_ENTRY_SIZE
 566                            + XC_PAGE_SIZE - 1)
 567                           & XC_PAGE_MASK);
 568
 569     rc = xen_host_pci_get_long(hd, base + PCI_MSIX_TABLE, &table_off);
 570     if (rc) {
 571         XEN_PT_ERR(d, "Failed to read PCI_MSIX_TABLE field\n");
 572         goto error_out;
 573     }
 574     bar_index = msix->bar_index = table_off & PCI_MSIX_FLAGS_BIRMASK;
 575     table_off = table_off & ~PCI_MSIX_FLAGS_BIRMASK;
 576     msix->table_base = s->real_device.io_regions[bar_index].base_addr;
 577     XEN_PT_LOG(d, "get MSI-X table BAR base 0x%"PRIx64"\n", msix->table_base);
 578
 579     fd = open("/dev/mem", O_RDWR);
 580     if (fd == -1) {
 581         rc = -errno;
 582         XEN_PT_ERR(d, "Can't open /dev/mem: %s\n", strerror(errno));
 583         goto error_out;
 584     }
 585     XEN_PT_LOG(d, "table_off = 0x%x, total_entries = %d\n",
 586                table_off, total_entries);
 587     msix->table_offset_adjust = table_off & 0x0fff;
 588     msix->phys_iomem_base =
 589         mmap(NULL,
 590              total_entries * PCI_MSIX_ENTRY_SIZE + msix->table_offset_adjust,
 591              PROT_READ,
 592              MAP_SHARED | MAP_LOCKED,
 593              fd,
 594              msix->table_base + table_off - msix->table_offset_adjust);
 595     close(fd);
 596     if (msix->phys_iomem_base == MAP_FAILED) {
 597         rc = -errno;
 598         XEN_PT_ERR(d, "Can't map physical MSI-X table: %s\n", strerror(errno));
 599         goto error_out;
 600     }
 601     msix->phys_iomem_base = (char *)msix->phys_iomem_base
 602         + msix->table_offset_adjust;
 603
 604     XEN_PT_LOG(d, "mapping physical MSI-X table to %p\n",
 605                msix->phys_iomem_base);
 606
 607     memory_region_add_subregion_overlap(&s->bar[bar_index], table_off,
 608                                         &msix->mmio,
 609                                         2); /* Priority: pci default + 1 */
 610
 611     return 0;
 612
 613 error_out:
 614     g_free(s->msix);
 615     s->msix = NULL;
 616     return rc;
 617 }
 618
 619 void xen_pt_msix_unmap(XenPCIPassthroughState *s)
 620 {
 621     XenPTMSIX *msix = s->msix;
 622
 623     if (!msix) {
 624         return;
 625     }
 626
 627     /* unmap the MSI-X memory mapped register area */
 628     if (msix->phys_iomem_base) {
 629         XEN_PT_LOG(&s->dev, "unmapping physical MSI-X table from %p\n",
 630                    msix->phys_iomem_base);
 631         munmap(msix->phys_iomem_base, msix->total_entries * PCI_MSIX_ENTRY_SIZE
 632                + msix->table_offset_adjust);
 633     }
 634
 635     memory_region_del_subregion(&s->bar[msix->bar_index], &msix->mmio);
 636 }
 637
 638 void xen_pt_msix_delete(XenPCIPassthroughState *s)
 639 {
 640     XenPTMSIX *msix = s->msix;
 641
 642     if (!msix) {
 643         return;
 644     }
 645
 646     object_unparent(OBJECT(&msix->mmio));
 647
 648     g_free(s->msix);
 649     s->msix = NULL;
 650 }