1 /* 2 * XEN platform pci device, formerly known as the event channel device 3 * 4 * Copyright (c) 2003-2004 Intel Corp. 5 * Copyright (c) 2006 XenSource 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qapi/error.h" 28 #include "hw/hw.h" 29 #include "hw/i386/pc.h" 30 #include "hw/ide.h" 31 #include "hw/pci/pci.h" 32 #include "hw/irq.h" 33 #include "hw/xen/xen_common.h" 34 #include "hw/xen/xen_backend.h" 35 #include "trace.h" 36 #include "exec/address-spaces.h" 37 #include "sysemu/block-backend.h" 38 #include "qemu/error-report.h" 39 40 #include <xenguest.h> 41 42 //#define DEBUG_PLATFORM 43 44 #ifdef DEBUG_PLATFORM 45 #define DPRINTF(fmt, ...) do { \ 46 fprintf(stderr, "xen_platform: " fmt, ## __VA_ARGS__); \ 47 } while (0) 48 #else 49 #define DPRINTF(fmt, ...) do { } while (0) 50 #endif 51 52 #define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */ 53 54 typedef struct PCIXenPlatformState { 55 /*< private >*/ 56 PCIDevice parent_obj; 57 /*< public >*/ 58 59 MemoryRegion fixed_io; 60 MemoryRegion bar; 61 MemoryRegion mmio_bar; 62 uint8_t flags; /* used only for version_id == 2 */ 63 int drivers_blacklisted; 64 uint16_t driver_product_version; 65 66 /* Log from guest drivers */ 67 char log_buffer[4096]; 68 int log_buffer_off; 69 } PCIXenPlatformState; 70 71 #define TYPE_XEN_PLATFORM "xen-platform" 72 #define XEN_PLATFORM(obj) \ 73 OBJECT_CHECK(PCIXenPlatformState, (obj), TYPE_XEN_PLATFORM) 74 75 #define XEN_PLATFORM_IOPORT 0x10 76 77 /* Send bytes to syslog */ 78 static void log_writeb(PCIXenPlatformState *s, char val) 79 { 80 if (val == '\n' || s->log_buffer_off == sizeof(s->log_buffer) - 1) { 81 /* Flush buffer */ 82 s->log_buffer[s->log_buffer_off] = 0; 83 trace_xen_platform_log(s->log_buffer); 84 s->log_buffer_off = 0; 85 } else { 86 s->log_buffer[s->log_buffer_off++] = val; 87 } 88 } 89 90 /* 91 * Unplug device flags. 92 * 93 * The logic got a little confused at some point in the past but this is 94 * what they do now. 95 * 96 * bit 0: Unplug all IDE and SCSI disks. 97 * bit 1: Unplug all NICs. 98 * bit 2: Unplug IDE disks except primary master. This is overridden if 99 * bit 0 is also present in the mask. 100 * bit 3: Unplug all NVMe disks. 101 * 102 */ 103 #define _UNPLUG_IDE_SCSI_DISKS 0 104 #define UNPLUG_IDE_SCSI_DISKS (1u << _UNPLUG_IDE_SCSI_DISKS) 105 106 #define _UNPLUG_ALL_NICS 1 107 #define UNPLUG_ALL_NICS (1u << _UNPLUG_ALL_NICS) 108 109 #define _UNPLUG_AUX_IDE_DISKS 2 110 #define UNPLUG_AUX_IDE_DISKS (1u << _UNPLUG_AUX_IDE_DISKS) 111 112 #define _UNPLUG_NVME_DISKS 3 113 #define UNPLUG_NVME_DISKS (1u << _UNPLUG_NVME_DISKS) 114 115 static void unplug_nic(PCIBus *b, PCIDevice *d, void *o) 116 { 117 /* We have to ignore passthrough devices */ 118 if (pci_get_word(d->config + PCI_CLASS_DEVICE) == 119 PCI_CLASS_NETWORK_ETHERNET 120 && strcmp(d->name, "xen-pci-passthrough") != 0) { 121 object_unparent(OBJECT(d)); 122 } 123 } 124 125 /* Remove the peer of the NIC device. Normally, this would be a tap device. */ 126 static void del_nic_peer(NICState *nic, void *opaque) 127 { 128 NetClientState *nc; 129 130 nc = qemu_get_queue(nic); 131 if (nc->peer) 132 qemu_del_net_client(nc->peer); 133 } 134 135 static void pci_unplug_nics(PCIBus *bus) 136 { 137 qemu_foreach_nic(del_nic_peer, NULL); 138 pci_for_each_device(bus, 0, unplug_nic, NULL); 139 } 140 141 static void unplug_disks(PCIBus *b, PCIDevice *d, void *opaque) 142 { 143 uint32_t flags = *(uint32_t *)opaque; 144 bool aux = (flags & UNPLUG_AUX_IDE_DISKS) && 145 !(flags & UNPLUG_IDE_SCSI_DISKS); 146 147 /* We have to ignore passthrough devices */ 148 if (!strcmp(d->name, "xen-pci-passthrough")) { 149 return; 150 } 151 152 switch (pci_get_word(d->config + PCI_CLASS_DEVICE)) { 153 case PCI_CLASS_STORAGE_IDE: 154 pci_piix3_xen_ide_unplug(DEVICE(d), aux); 155 break; 156 157 case PCI_CLASS_STORAGE_SCSI: 158 if (!aux) { 159 object_unparent(OBJECT(d)); 160 } 161 break; 162 163 case PCI_CLASS_STORAGE_EXPRESS: 164 if (flags & UNPLUG_NVME_DISKS) { 165 object_unparent(OBJECT(d)); 166 } 167 168 default: 169 break; 170 } 171 } 172 173 static void pci_unplug_disks(PCIBus *bus, uint32_t flags) 174 { 175 pci_for_each_device(bus, 0, unplug_disks, &flags); 176 } 177 178 static void platform_fixed_ioport_writew(void *opaque, uint32_t addr, uint32_t val) 179 { 180 PCIXenPlatformState *s = opaque; 181 182 switch (addr) { 183 case 0: { 184 PCIDevice *pci_dev = PCI_DEVICE(s); 185 /* Unplug devices. See comment above flag definitions */ 186 if (val & (UNPLUG_IDE_SCSI_DISKS | UNPLUG_AUX_IDE_DISKS | 187 UNPLUG_NVME_DISKS)) { 188 DPRINTF("unplug disks\n"); 189 pci_unplug_disks(pci_dev->bus, val); 190 } 191 if (val & UNPLUG_ALL_NICS) { 192 DPRINTF("unplug nics\n"); 193 pci_unplug_nics(pci_dev->bus); 194 } 195 break; 196 } 197 case 2: 198 switch (val) { 199 case 1: 200 DPRINTF("Citrix Windows PV drivers loaded in guest\n"); 201 break; 202 case 0: 203 DPRINTF("Guest claimed to be running PV product 0?\n"); 204 break; 205 default: 206 DPRINTF("Unknown PV product %d loaded in guest\n", val); 207 break; 208 } 209 s->driver_product_version = val; 210 break; 211 } 212 } 213 214 static void platform_fixed_ioport_writel(void *opaque, uint32_t addr, 215 uint32_t val) 216 { 217 switch (addr) { 218 case 0: 219 /* PV driver version */ 220 break; 221 } 222 } 223 224 static void platform_fixed_ioport_writeb(void *opaque, uint32_t addr, uint32_t val) 225 { 226 PCIXenPlatformState *s = opaque; 227 228 switch (addr) { 229 case 0: /* Platform flags */ { 230 hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ? 231 HVMMEM_ram_ro : HVMMEM_ram_rw; 232 if (xen_set_mem_type(xen_domid, mem_type, 0xc0, 0x40)) { 233 DPRINTF("unable to change ro/rw state of ROM memory area!\n"); 234 } else { 235 s->flags = val & PFFLAG_ROM_LOCK; 236 DPRINTF("changed ro/rw state of ROM memory area. now is %s state.\n", 237 (mem_type == HVMMEM_ram_ro ? "ro":"rw")); 238 } 239 break; 240 } 241 case 2: 242 log_writeb(s, val); 243 break; 244 } 245 } 246 247 static uint32_t platform_fixed_ioport_readw(void *opaque, uint32_t addr) 248 { 249 PCIXenPlatformState *s = opaque; 250 251 switch (addr) { 252 case 0: 253 if (s->drivers_blacklisted) { 254 /* The drivers will recognise this magic number and refuse 255 * to do anything. */ 256 return 0xd249; 257 } else { 258 /* Magic value so that you can identify the interface. */ 259 return 0x49d2; 260 } 261 default: 262 return 0xffff; 263 } 264 } 265 266 static uint32_t platform_fixed_ioport_readb(void *opaque, uint32_t addr) 267 { 268 PCIXenPlatformState *s = opaque; 269 270 switch (addr) { 271 case 0: 272 /* Platform flags */ 273 return s->flags; 274 case 2: 275 /* Version number */ 276 return 1; 277 default: 278 return 0xff; 279 } 280 } 281 282 static void platform_fixed_ioport_reset(void *opaque) 283 { 284 PCIXenPlatformState *s = opaque; 285 286 platform_fixed_ioport_writeb(s, 0, 0); 287 } 288 289 static uint64_t platform_fixed_ioport_read(void *opaque, 290 hwaddr addr, 291 unsigned size) 292 { 293 switch (size) { 294 case 1: 295 return platform_fixed_ioport_readb(opaque, addr); 296 case 2: 297 return platform_fixed_ioport_readw(opaque, addr); 298 default: 299 return -1; 300 } 301 } 302 303 static void platform_fixed_ioport_write(void *opaque, hwaddr addr, 304 305 uint64_t val, unsigned size) 306 { 307 switch (size) { 308 case 1: 309 platform_fixed_ioport_writeb(opaque, addr, val); 310 break; 311 case 2: 312 platform_fixed_ioport_writew(opaque, addr, val); 313 break; 314 case 4: 315 platform_fixed_ioport_writel(opaque, addr, val); 316 break; 317 } 318 } 319 320 321 static const MemoryRegionOps platform_fixed_io_ops = { 322 .read = platform_fixed_ioport_read, 323 .write = platform_fixed_ioport_write, 324 .valid = { 325 .unaligned = true, 326 }, 327 .impl = { 328 .min_access_size = 1, 329 .max_access_size = 4, 330 .unaligned = true, 331 }, 332 .endianness = DEVICE_LITTLE_ENDIAN, 333 }; 334 335 static void platform_fixed_ioport_init(PCIXenPlatformState* s) 336 { 337 memory_region_init_io(&s->fixed_io, OBJECT(s), &platform_fixed_io_ops, s, 338 "xen-fixed", 16); 339 memory_region_add_subregion(get_system_io(), XEN_PLATFORM_IOPORT, 340 &s->fixed_io); 341 } 342 343 /* Xen Platform PCI Device */ 344 345 static uint64_t xen_platform_ioport_readb(void *opaque, hwaddr addr, 346 unsigned int size) 347 { 348 if (addr == 0) { 349 return platform_fixed_ioport_readb(opaque, 0); 350 } else { 351 return ~0u; 352 } 353 } 354 355 static void xen_platform_ioport_writeb(void *opaque, hwaddr addr, 356 uint64_t val, unsigned int size) 357 { 358 PCIXenPlatformState *s = opaque; 359 PCIDevice *pci_dev = PCI_DEVICE(s); 360 361 switch (addr) { 362 case 0: /* Platform flags */ 363 platform_fixed_ioport_writeb(opaque, 0, (uint32_t)val); 364 break; 365 case 4: 366 if (val == 1) { 367 /* 368 * SUSE unplug for Xenlinux 369 * xen-kmp used this since xen-3.0.4, instead the official protocol 370 * from xen-3.3+ It did an unconditional "outl(1, (ioaddr + 4));" 371 * Pre VMDP 1.7 used 4 and 8 depending on how VMDP was configured. 372 * If VMDP was to control both disk and LAN it would use 4. 373 * If it controlled just disk or just LAN, it would use 8 below. 374 */ 375 pci_unplug_disks(pci_dev->bus, UNPLUG_IDE_SCSI_DISKS); 376 pci_unplug_nics(pci_dev->bus); 377 } 378 break; 379 case 8: 380 switch (val) { 381 case 1: 382 pci_unplug_disks(pci_dev->bus, UNPLUG_IDE_SCSI_DISKS); 383 break; 384 case 2: 385 pci_unplug_nics(pci_dev->bus); 386 break; 387 default: 388 log_writeb(s, (uint32_t)val); 389 break; 390 } 391 break; 392 default: 393 break; 394 } 395 } 396 397 static const MemoryRegionOps xen_pci_io_ops = { 398 .read = xen_platform_ioport_readb, 399 .write = xen_platform_ioport_writeb, 400 .impl.min_access_size = 1, 401 .impl.max_access_size = 1, 402 }; 403 404 static void platform_ioport_bar_setup(PCIXenPlatformState *d) 405 { 406 memory_region_init_io(&d->bar, OBJECT(d), &xen_pci_io_ops, d, 407 "xen-pci", 0x100); 408 } 409 410 static uint64_t platform_mmio_read(void *opaque, hwaddr addr, 411 unsigned size) 412 { 413 DPRINTF("Warning: attempted read from physical address " 414 "0x" TARGET_FMT_plx " in xen platform mmio space\n", addr); 415 416 return 0; 417 } 418 419 static void platform_mmio_write(void *opaque, hwaddr addr, 420 uint64_t val, unsigned size) 421 { 422 DPRINTF("Warning: attempted write of 0x%"PRIx64" to physical " 423 "address 0x" TARGET_FMT_plx " in xen platform mmio space\n", 424 val, addr); 425 } 426 427 static const MemoryRegionOps platform_mmio_handler = { 428 .read = &platform_mmio_read, 429 .write = &platform_mmio_write, 430 .endianness = DEVICE_NATIVE_ENDIAN, 431 }; 432 433 static void platform_mmio_setup(PCIXenPlatformState *d) 434 { 435 memory_region_init_io(&d->mmio_bar, OBJECT(d), &platform_mmio_handler, d, 436 "xen-mmio", 0x1000000); 437 } 438 439 static int xen_platform_post_load(void *opaque, int version_id) 440 { 441 PCIXenPlatformState *s = opaque; 442 443 platform_fixed_ioport_writeb(s, 0, s->flags); 444 445 return 0; 446 } 447 448 static const VMStateDescription vmstate_xen_platform = { 449 .name = "platform", 450 .version_id = 4, 451 .minimum_version_id = 4, 452 .post_load = xen_platform_post_load, 453 .fields = (VMStateField[]) { 454 VMSTATE_PCI_DEVICE(parent_obj, PCIXenPlatformState), 455 VMSTATE_UINT8(flags, PCIXenPlatformState), 456 VMSTATE_END_OF_LIST() 457 } 458 }; 459 460 static void xen_platform_realize(PCIDevice *dev, Error **errp) 461 { 462 PCIXenPlatformState *d = XEN_PLATFORM(dev); 463 uint8_t *pci_conf; 464 465 /* Device will crash on reset if xen is not initialized */ 466 if (!xen_enabled()) { 467 error_setg(errp, "xen-platform device requires the Xen accelerator"); 468 return; 469 } 470 471 pci_conf = dev->config; 472 473 pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY); 474 475 pci_config_set_prog_interface(pci_conf, 0); 476 477 pci_conf[PCI_INTERRUPT_PIN] = 1; 478 479 platform_ioport_bar_setup(d); 480 pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &d->bar); 481 482 /* reserve 16MB mmio address for share memory*/ 483 platform_mmio_setup(d); 484 pci_register_bar(dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH, 485 &d->mmio_bar); 486 487 platform_fixed_ioport_init(d); 488 } 489 490 static void platform_reset(DeviceState *dev) 491 { 492 PCIXenPlatformState *s = XEN_PLATFORM(dev); 493 494 platform_fixed_ioport_reset(s); 495 } 496 497 static void xen_platform_class_init(ObjectClass *klass, void *data) 498 { 499 DeviceClass *dc = DEVICE_CLASS(klass); 500 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 501 502 k->realize = xen_platform_realize; 503 k->vendor_id = PCI_VENDOR_ID_XEN; 504 k->device_id = PCI_DEVICE_ID_XEN_PLATFORM; 505 k->class_id = PCI_CLASS_OTHERS << 8 | 0x80; 506 k->subsystem_vendor_id = PCI_VENDOR_ID_XEN; 507 k->subsystem_id = PCI_DEVICE_ID_XEN_PLATFORM; 508 k->revision = 1; 509 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 510 dc->desc = "XEN platform pci device"; 511 dc->reset = platform_reset; 512 dc->vmsd = &vmstate_xen_platform; 513 } 514 515 static const TypeInfo xen_platform_info = { 516 .name = TYPE_XEN_PLATFORM, 517 .parent = TYPE_PCI_DEVICE, 518 .instance_size = sizeof(PCIXenPlatformState), 519 .class_init = xen_platform_class_init, 520 .interfaces = (InterfaceInfo[]) { 521 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 522 { }, 523 }, 524 }; 525 526 static void xen_platform_register_types(void) 527 { 528 type_register_static(&xen_platform_info); 529 } 530 531 type_init(xen_platform_register_types) 532