palacios/src/devices/lnx_virtio_sym.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20 #include <palacios/vmm.h>
  21 #include <palacios/vmm_dev_mgr.h>
  22 #include <palacios/vm_guest_mem.h>
  23 #include <devices/lnx_virtio_pci.h>
  24
  25 #include <devices/pci.h>
  26
  27
  28 #define SYM_MAGIC_PORT 20
  29 #define SYM_SWAP_BASE_PORT 24
  30 #define SYM_SWAP_SIZE_PORT 32
  31
  32
  33 #define QUEUE_SIZE 128
  34
  35 struct sym_config {
  36     uint32_t magic;
  37     uint64_t swap_base;
  38     uint32_t swap_size;
  39 } __attribute__((packed));
  40
  41
  42
  43 struct virtio_sym_state {
  44     struct sym_config sym_cfg;
  45     struct virtio_config virtio_cfg;
  46
  47
  48     struct vm_device * pci_bus;
  49     struct pci_device * pci_dev;
  50
  51     struct virtio_queue queue[1];
  52
  53     struct virtio_queue * cur_queue;
  54
  55     int io_range_size;
  56 };
  57
  58
  59
  60
  61
  62 static int virtio_reset(struct virtio_sym_state * virtio) {
  63
  64     memset(virtio->queue, 0, sizeof(struct virtio_queue));
  65
  66     virtio->cur_queue = &(virtio->queue[0]);
  67
  68
  69     virtio->virtio_cfg.status = 0;
  70     virtio->virtio_cfg.pci_isr = 0;
  71
  72     virtio->queue[1].queue_size = QUEUE_SIZE;
  73
  74
  75     memset(&(virtio->sym_cfg), 0, sizeof(struct sym_config));
  76
  77     return 0;
  78 }
  79
  80
  81 static int get_desc_count(struct virtio_queue * q, int index) {
  82     struct vring_desc * tmp_desc = &(q->desc[index]);
  83     int cnt = 1;
  84
  85     while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
  86         tmp_desc = &(q->desc[tmp_desc->next]);
  87         cnt++;
  88     }
  89
  90     return cnt;
  91 }
  92
  93
  94 static int handle_kick(struct guest_info * core, struct virtio_sym_state * sym_state) {
  95     struct virtio_queue * q = sym_state->cur_queue;
  96
  97     return -1;
  98
  99     PrintDebug("VIRTIO Symbiotic KICK: cur_index=%d (mod=%d), avail_index=%d\n",
 100                q->cur_avail_idx, q->cur_avail_idx % QUEUE_SIZE, q->avail->index);
 101
 102     while (q->cur_avail_idx < q->avail->index) {
 103         struct vring_desc * tmp_desc = NULL;
 104         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 105         int desc_cnt = get_desc_count(q, desc_idx);
 106         int i = 0;
 107         uint32_t req_len = 0;
 108
 109
 110         PrintDebug("Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE);
 111
 112         for (i = 0; i < desc_cnt; i++) {
 113             addr_t page_addr;
 114             tmp_desc = &(q->desc[desc_idx]);
 115
 116             PrintDebug("Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n",
 117                        tmp_desc,
 118                        (void *)(addr_t)(tmp_desc->addr_gpa), tmp_desc->length,
 119                        tmp_desc->flags, tmp_desc->next);
 120
 121
 122             if (v3_gpa_to_hva(core, tmp_desc->addr_gpa, (addr_t *)&(page_addr)) == -1) {
 123                 PrintError("Could not translate block header address\n");
 124                 return -1;
 125             }
 126
 127             /*
 128                if (handle_sym_op(dev, tmp_desc, buf_desc, status_desc) == -1) {
 129                PrintError("Error handling symbiotic operation\n");
 130                return -1;
 131                }
 132             */
 133
 134             PrintDebug("Symbiotic Device Currently Ignored\n");
 135
 136
 137             req_len += tmp_desc->length;
 138             desc_idx = tmp_desc->next;
 139         }
 140
 141         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 142         q->used->ring[q->used->index % QUEUE_SIZE].length = req_len; // What do we set this to????
 143
 144         q->used->index++;
 145         q->cur_avail_idx++;
 146     }
 147
 148     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 149         PrintDebug("Raising IRQ %d\n",  sym_state->pci_dev->config_header.intr_line);
 150         v3_pci_raise_irq(sym_state->pci_bus, 0, sym_state->pci_dev);
 151         sym_state->virtio_cfg.pci_isr = VIRTIO_ISR_ACTIVE;
 152     }
 153
 154     return 0;
 155 }
 156
 157
 158 static int virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 159     struct virtio_sym_state * sym_state = (struct virtio_sym_state *)private_data;
 160     int port_idx = port % sym_state->io_range_size;
 161
 162
 163 /*
 164     PrintDebug("VIRTIO SYMBIOTIC Write for port %d (index=%d) len=%d, value=%x\n",
 165                port, port_idx,  length, *(uint32_t *)src);
 166 */
 167
 168
 169     switch (port_idx) {
 170         case GUEST_FEATURES_PORT:
 171             if (length != 4) {
 172                 PrintError("Illegal write length for guest features\n");
 173                 return -1;
 174             }
 175
 176             sym_state->virtio_cfg.guest_features = *(uint32_t *)src;
 177
 178             break;
 179         case VRING_PG_NUM_PORT:
 180             if (length == 4) {
 181                 addr_t pfn = *(uint32_t *)src;
 182                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 183
 184
 185                 sym_state->cur_queue->pfn = pfn;
 186
 187                 sym_state->cur_queue->ring_desc_addr = page_addr ;
 188                 sym_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 189                 sym_state->cur_queue->ring_used_addr = ( sym_state->cur_queue->ring_avail_addr + \
 190                                                  sizeof(struct vring_avail)    + \
 191                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 192
 193                 // round up to next page boundary.
 194                 sym_state->cur_queue->ring_used_addr = (sym_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 195
 196                 if (v3_gpa_to_hva(core, sym_state->cur_queue->ring_desc_addr, (addr_t *)&(sym_state->cur_queue->desc)) == -1) {
 197                     PrintError("Could not translate ring descriptor address\n");
 198                     return -1;
 199                 }
 200
 201
 202                 if (v3_gpa_to_hva(core, sym_state->cur_queue->ring_avail_addr, (addr_t *)&(sym_state->cur_queue->avail)) == -1) {
 203                     PrintError("Could not translate ring available address\n");
 204                     return -1;
 205                 }
 206
 207
 208                 if (v3_gpa_to_hva(core, sym_state->cur_queue->ring_used_addr, (addr_t *)&(sym_state->cur_queue->used)) == -1) {
 209                     PrintError("Could not translate ring used address\n");
 210                     return -1;
 211                 }
 212
 213                 PrintDebug("RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 214                            (void *)(sym_state->cur_queue->ring_desc_addr),
 215                            (void *)(sym_state->cur_queue->ring_avail_addr),
 216                            (void *)(sym_state->cur_queue->ring_used_addr));
 217
 218                 PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n",
 219                            sym_state->cur_queue->desc, sym_state->cur_queue->avail, sym_state->cur_queue->used);
 220
 221             } else {
 222                 PrintError("Illegal write length for page frame number\n");
 223                 return -1;
 224             }
 225             break;
 226         case VRING_Q_SEL_PORT:
 227             sym_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 228
 229             if (sym_state->virtio_cfg.vring_queue_selector > 0) {
 230                 PrintError("Virtio Symbiotic device has not qeueues. Selected %d\n",
 231                            sym_state->virtio_cfg.vring_queue_selector);
 232                 return -1;
 233             }
 234
 235             sym_state->cur_queue = &(sym_state->queue[sym_state->virtio_cfg.vring_queue_selector]);
 236
 237             break;
 238         case VRING_Q_NOTIFY_PORT:
 239             PrintDebug("Handling Kick\n");
 240             if (handle_kick(core, sym_state) == -1) {
 241                 PrintError("Could not handle Symbiotic Notification\n");
 242                 return -1;
 243             }
 244             break;
 245         case VIRTIO_STATUS_PORT:
 246             sym_state->virtio_cfg.status = *(uint8_t *)src;
 247
 248             if (sym_state->virtio_cfg.status == 0) {
 249                 PrintDebug("Resetting device\n");
 250                 virtio_reset(sym_state);
 251             }
 252
 253             break;
 254
 255         case VIRTIO_ISR_PORT:
 256             sym_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 257             break;
 258         default:
 259             return -1;
 260             break;
 261     }
 262
 263     return length;
 264 }
 265
 266
 267 static int virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 268
 269     struct virtio_sym_state * sym_state = (struct virtio_sym_state *)private_data;
 270     int port_idx = port % sym_state->io_range_size;
 271
 272 /*
 273     PrintDebug("VIRTIO SYMBIOTIC Read  for port %d (index =%d), length=%d\n",
 274                port, port_idx, length);
 275 */
 276     switch (port_idx) {
 277         case HOST_FEATURES_PORT:
 278             if (length != 4) {
 279                 PrintError("Illegal read length for host features\n");
 280                 return -1;
 281             }
 282
 283             *(uint32_t *)dst = sym_state->virtio_cfg.host_features;
 284
 285             break;
 286         case VRING_PG_NUM_PORT:
 287             if (length != 4) {
 288                 PrintError("Illegal read length for page frame number\n");
 289                 return -1;
 290             }
 291
 292             *(uint32_t *)dst = sym_state->cur_queue->pfn;
 293
 294             break;
 295         case VRING_SIZE_PORT:
 296             if (length != 2) {
 297                 PrintError("Illegal read length for vring size\n");
 298                 return -1;
 299             }
 300
 301             *(uint16_t *)dst = sym_state->cur_queue->queue_size;
 302
 303             break;
 304
 305         case VIRTIO_STATUS_PORT:
 306             if (length != 1) {
 307                 PrintError("Illegal read length for status\n");
 308                 return -1;
 309             }
 310
 311             *(uint8_t *)dst = sym_state->virtio_cfg.status;
 312             break;
 313
 314         case VIRTIO_ISR_PORT:
 315             *(uint8_t *)dst = sym_state->virtio_cfg.pci_isr;
 316             sym_state->virtio_cfg.pci_isr = 0;
 317             v3_pci_lower_irq(sym_state->pci_bus, 0, sym_state->pci_dev);
 318             break;
 319
 320         default:
 321             if ( (port_idx >= sizeof(struct virtio_config)) &&
 322                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct sym_config))) ) {
 323                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 324                 uint8_t * cfg_ptr = (uint8_t *)&(sym_state->sym_cfg);
 325
 326                 memcpy(dst, cfg_ptr + cfg_offset, length);
 327
 328             } else {
 329                 PrintError("Read of Unhandled Virtio Read\n");
 330                 return -1;
 331             }
 332
 333             break;
 334     }
 335
 336     return length;
 337 }
 338
 339
 340 int virtio_free(struct virtio_sym_state * virtio_state) {
 341
 342     // unregister from PCI
 343
 344     V3_Free(virtio_state);
 345     return 0;
 346 }
 347
 348
 349
 350 static struct v3_device_ops dev_ops = {
 351     .free = (int (*)(void *))virtio_free,
 352 };
 353
 354
 355
 356
 357 static int virtio_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 358     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 359     struct virtio_sym_state * virtio_state = NULL;
 360     struct pci_device * pci_dev = NULL;
 361     char * dev_id = v3_cfg_val(cfg, "ID");
 362
 363     PrintDebug("Initializing VIRTIO Symbiotic device\n");
 364
 365     if (pci_bus == NULL) {
 366         PrintError("VirtIO devices require a PCI Bus");
 367         return -1;
 368     }
 369
 370
 371     virtio_state  = (struct virtio_sym_state *)V3_Malloc(sizeof(struct virtio_sym_state));
 372     memset(virtio_state, 0, sizeof(struct virtio_sym_state));
 373
 374
 375     struct vm_device * dev = v3_add_device(vm, dev_id, &dev_ops, virtio_state);
 376
 377     if (dev == NULL) {
 378         PrintError("Could not attach device %s\n", dev_id);
 379         V3_Free(virtio_state);
 380         return -1;
 381     }
 382
 383
 384     // PCI initialization
 385     {
 386         struct v3_pci_bar bars[6];
 387         int num_ports = sizeof(struct virtio_config) + sizeof(struct sym_config);
 388         int tmp_ports = num_ports;
 389         int i;
 390
 391
 392
 393         // This gets the number of ports, rounded up to a power of 2
 394         virtio_state->io_range_size = 1; // must be a power of 2
 395
 396         while (tmp_ports > 0) {
 397             tmp_ports >>= 1;
 398             virtio_state->io_range_size <<= 1;
 399         }
 400
 401         // this is to account for any low order bits being set in num_ports
 402         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 403         if ((num_ports & ((virtio_state->io_range_size >> 1) - 1)) == 0) {
 404             virtio_state->io_range_size >>= 1;
 405         }
 406
 407
 408         for (i = 0; i < 6; i++) {
 409             bars[i].type = PCI_BAR_NONE;
 410         }
 411
 412         bars[0].type = PCI_BAR_IO;
 413         bars[0].default_base_port = -1;
 414         bars[0].num_ports = virtio_state->io_range_size;
 415
 416         bars[0].io_read = virtio_io_read;
 417         bars[0].io_write = virtio_io_write;
 418         bars[0].private_data = virtio_state;
 419
 420         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 421                                          0, PCI_AUTO_DEV_NUM, 0,
 422                                          "LNX_VIRTIO_SYM", bars,
 423                                          NULL, NULL, NULL, virtio_state);
 424
 425         if (!pci_dev) {
 426             PrintError("Could not register PCI Device\n");
 427             v3_remove_device(dev);
 428             return -1;
 429         }
 430
 431         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 432         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 433
 434
 435         pci_dev->config_header.device_id = VIRTIO_SYMBIOTIC_DEV_ID;
 436         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 437         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 438
 439         pci_dev->config_header.subsystem_id = VIRTIO_SYMBIOTIC_SUBDEVICE_ID;
 440
 441
 442         pci_dev->config_header.intr_pin = 1;
 443
 444         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 445
 446
 447         virtio_state->pci_dev = pci_dev;
 448         virtio_state->pci_bus = pci_bus;
 449     }
 450
 451     virtio_reset(virtio_state);
 452
 453
 454     return 0;
 455 }
 456
 457
 458 device_register("LNX_VIRTIO_SYM", virtio_init)