hw/s390x/ipl.c

   1 /*
   2  * bootloader support
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Christian Borntraeger <borntraeger@de.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
  10  * option) any later version.  See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "qapi/error.h"
  16 #include "sysemu/sysemu.h"
  17 #include "cpu.h"
  18 #include "elf.h"
  19 #include "hw/loader.h"
  20 #include "hw/s390x/virtio-ccw.h"
  21 #include "hw/s390x/css.h"
  22 #include "ipl.h"
  23 #include "qemu/error-report.h"
  24
  25 #define KERN_IMAGE_START                0x010000UL
  26 #define KERN_PARM_AREA                  0x010480UL
  27 #define INITRD_START                    0x800000UL
  28 #define INITRD_PARM_START               0x010408UL
  29 #define INITRD_PARM_SIZE                0x010410UL
  30 #define PARMFILE_START                  0x001000UL
  31 #define ZIPL_IMAGE_START                0x009000UL
  32 #define IPL_PSW_MASK                    (PSW_MASK_32 | PSW_MASK_64)
  33
  34 static bool iplb_extended_needed(void *opaque)
  35 {
  36     S390IPLState *ipl = S390_IPL(object_resolve_path(TYPE_S390_IPL, NULL));
  37
  38     return ipl->iplbext_migration;
  39 }
  40
  41 static const VMStateDescription vmstate_iplb_extended = {
  42     .name = "ipl/iplb_extended",
  43     .version_id = 0,
  44     .minimum_version_id = 0,
  45     .needed = iplb_extended_needed,
  46     .fields = (VMStateField[]) {
  47         VMSTATE_UINT8_ARRAY(reserved_ext, IplParameterBlock, 4096 - 200),
  48         VMSTATE_END_OF_LIST()
  49     }
  50 };
  51
  52 static const VMStateDescription vmstate_iplb = {
  53     .name = "ipl/iplb",
  54     .version_id = 0,
  55     .minimum_version_id = 0,
  56     .fields = (VMStateField[]) {
  57         VMSTATE_UINT8_ARRAY(reserved1, IplParameterBlock, 110),
  58         VMSTATE_UINT16(devno, IplParameterBlock),
  59         VMSTATE_UINT8_ARRAY(reserved2, IplParameterBlock, 88),
  60         VMSTATE_END_OF_LIST()
  61     },
  62     .subsections = (const VMStateDescription*[]) {
  63         &vmstate_iplb_extended,
  64         NULL
  65     }
  66 };
  67
  68 static const VMStateDescription vmstate_ipl = {
  69     .name = "ipl",
  70     .version_id = 0,
  71     .minimum_version_id = 0,
  72     .fields = (VMStateField[]) {
  73         VMSTATE_UINT64(compat_start_addr, S390IPLState),
  74         VMSTATE_UINT64(compat_bios_start_addr, S390IPLState),
  75         VMSTATE_STRUCT(iplb, S390IPLState, 0, vmstate_iplb, IplParameterBlock),
  76         VMSTATE_BOOL(iplb_valid, S390IPLState),
  77         VMSTATE_UINT8(cssid, S390IPLState),
  78         VMSTATE_UINT8(ssid, S390IPLState),
  79         VMSTATE_UINT16(devno, S390IPLState),
  80         VMSTATE_END_OF_LIST()
  81      }
  82 };
  83
  84 static S390IPLState *get_ipl_device(void)
  85 {
  86     return S390_IPL(object_resolve_path_type("", TYPE_S390_IPL, NULL));
  87 }
  88
  89 static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
  90 {
  91     uint64_t dstaddr = *(uint64_t *) opaque;
  92     /*
  93      * Assuming that our s390-ccw.img was linked for starting at address 0,
  94      * we can simply add the destination address for the final location
  95      */
  96     return srcaddr + dstaddr;
  97 }
  98
  99 static void s390_ipl_realize(DeviceState *dev, Error **errp)
 100 {
 101     S390IPLState *ipl = S390_IPL(dev);
 102     uint64_t pentry = KERN_IMAGE_START;
 103     int kernel_size;
 104     Error *err = NULL;
 105
 106     int bios_size;
 107     char *bios_filename;
 108
 109     /*
 110      * Always load the bios if it was enforced,
 111      * even if an external kernel has been defined.
 112      */
 113     if (!ipl->kernel || ipl->enforce_bios) {
 114         uint64_t fwbase = (MIN(ram_size, 0x80000000U) - 0x200000) & ~0xffffUL;
 115
 116         if (bios_name == NULL) {
 117             bios_name = ipl->firmware;
 118         }
 119
 120         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 121         if (bios_filename == NULL) {
 122             error_setg(&err, "could not find stage1 bootloader");
 123             goto error;
 124         }
 125
 126         bios_size = load_elf(bios_filename, bios_translate_addr, &fwbase,
 127                              &ipl->bios_start_addr, NULL, NULL, 1,
 128                              EM_S390, 0, 0);
 129         if (bios_size > 0) {
 130             /* Adjust ELF start address to final location */
 131             ipl->bios_start_addr += fwbase;
 132         } else {
 133             /* Try to load non-ELF file */
 134             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
 135                                             4096);
 136             ipl->bios_start_addr = ZIPL_IMAGE_START;
 137         }
 138         g_free(bios_filename);
 139
 140         if (bios_size == -1) {
 141             error_setg(&err, "could not load bootloader '%s'", bios_name);
 142             goto error;
 143         }
 144
 145         /* default boot target is the bios */
 146         ipl->start_addr = ipl->bios_start_addr;
 147     }
 148
 149     if (ipl->kernel) {
 150         kernel_size = load_elf(ipl->kernel, NULL, NULL, &pentry, NULL,
 151                                NULL, 1, EM_S390, 0, 0);
 152         if (kernel_size < 0) {
 153             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
 154         }
 155         if (kernel_size < 0) {
 156             error_setg(&err, "could not load kernel '%s'", ipl->kernel);
 157             goto error;
 158         }
 159         /*
 160          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
 161          * kernel parameters here as well. Note: For old kernels (up to 3.2)
 162          * we can not rely on the ELF entry point - it was 0x800 (the SALIPL
 163          * loader) and it won't work. For this case we force it to 0x10000, too.
 164          */
 165         if (pentry == KERN_IMAGE_START || pentry == 0x800) {
 166             ipl->start_addr = KERN_IMAGE_START;
 167             /* Overwrite parameters in the kernel image, which are "rom" */
 168             strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
 169         } else {
 170             ipl->start_addr = pentry;
 171         }
 172
 173         if (ipl->initrd) {
 174             ram_addr_t initrd_offset;
 175             int initrd_size;
 176
 177             initrd_offset = INITRD_START;
 178             while (kernel_size + 0x100000 > initrd_offset) {
 179                 initrd_offset += 0x100000;
 180             }
 181             initrd_size = load_image_targphys(ipl->initrd, initrd_offset,
 182                                               ram_size - initrd_offset);
 183             if (initrd_size == -1) {
 184                 error_setg(&err, "could not load initrd '%s'", ipl->initrd);
 185                 goto error;
 186             }
 187
 188             /*
 189              * we have to overwrite values in the kernel image,
 190              * which are "rom"
 191              */
 192             stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 193             stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 194         }
 195     }
 196     /*
 197      * Don't ever use the migrated values, they could come from a different
 198      * BIOS and therefore don't work. But still migrate the values, so
 199      * QEMUs relying on it don't break.
 200      */
 201     ipl->compat_start_addr = ipl->start_addr;
 202     ipl->compat_bios_start_addr = ipl->bios_start_addr;
 203     qemu_register_reset(qdev_reset_all_fn, dev);
 204 error:
 205     error_propagate(errp, err);
 206 }
 207
 208 static Property s390_ipl_properties[] = {
 209     DEFINE_PROP_STRING("kernel", S390IPLState, kernel),
 210     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
 211     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
 212     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
 213     DEFINE_PROP_STRING("netboot_fw", S390IPLState, netboot_fw),
 214     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
 215     DEFINE_PROP_BOOL("iplbext_migration", S390IPLState, iplbext_migration,
 216                      true),
 217     DEFINE_PROP_END_OF_LIST(),
 218 };
 219
 220 static bool s390_gen_initial_iplb(S390IPLState *ipl)
 221 {
 222     DeviceState *dev_st;
 223
 224     dev_st = get_boot_device(0);
 225     if (dev_st) {
 226         VirtioCcwDevice *virtio_ccw_dev = (VirtioCcwDevice *)
 227             object_dynamic_cast(OBJECT(qdev_get_parent_bus(dev_st)->parent),
 228                 TYPE_VIRTIO_CCW_DEVICE);
 229         SCSIDevice *sd = (SCSIDevice *) object_dynamic_cast(OBJECT(dev_st),
 230                                                             TYPE_SCSI_DEVICE);
 231         VirtIONet *vn = (VirtIONet *) object_dynamic_cast(OBJECT(dev_st),
 232                                                           TYPE_VIRTIO_NET);
 233
 234         if (vn) {
 235             ipl->netboot = true;
 236         }
 237         if (virtio_ccw_dev) {
 238             CcwDevice *ccw_dev = CCW_DEVICE(virtio_ccw_dev);
 239
 240             ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_CCW_LEN);
 241             ipl->iplb.blk0_len =
 242                 cpu_to_be32(S390_IPLB_MIN_CCW_LEN - S390_IPLB_HEADER_LEN);
 243             ipl->iplb.pbt = S390_IPL_TYPE_CCW;
 244             ipl->iplb.ccw.devno = cpu_to_be16(ccw_dev->sch->devno);
 245             ipl->iplb.ccw.ssid = ccw_dev->sch->ssid & 3;
 246             return true;
 247         } else if (sd) {
 248             SCSIBus *bus = scsi_bus_from_device(sd);
 249             VirtIOSCSI *vdev = container_of(bus, VirtIOSCSI, bus);
 250             VirtIOSCSICcw *scsi_ccw = container_of(vdev, VirtIOSCSICcw, vdev);
 251             CcwDevice *ccw_dev = CCW_DEVICE(scsi_ccw);
 252
 253             ipl->iplb.len = cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN);
 254             ipl->iplb.blk0_len =
 255                 cpu_to_be32(S390_IPLB_MIN_QEMU_SCSI_LEN - S390_IPLB_HEADER_LEN);
 256             ipl->iplb.pbt = S390_IPL_TYPE_QEMU_SCSI;
 257             ipl->iplb.scsi.lun = cpu_to_be32(sd->lun);
 258             ipl->iplb.scsi.target = cpu_to_be16(sd->id);
 259             ipl->iplb.scsi.channel = cpu_to_be16(sd->channel);
 260             ipl->iplb.scsi.devno = cpu_to_be16(ccw_dev->sch->devno);
 261             ipl->iplb.scsi.ssid = ccw_dev->sch->ssid & 3;
 262             return true;
 263         }
 264     }
 265
 266     return false;
 267 }
 268
 269 static int load_netboot_image(Error **errp)
 270 {
 271     S390IPLState *ipl = get_ipl_device();
 272     char *netboot_filename;
 273     MemoryRegion *sysmem =  get_system_memory();
 274     MemoryRegion *mr = NULL;
 275     void *ram_ptr = NULL;
 276     int img_size = -1;
 277
 278     mr = memory_region_find(sysmem, 0, 1).mr;
 279     if (!mr) {
 280         error_setg(errp, "Failed to find memory region at address 0");
 281         return -1;
 282     }
 283
 284     ram_ptr = memory_region_get_ram_ptr(mr);
 285     if (!ram_ptr) {
 286         error_setg(errp, "No RAM found");
 287         goto unref_mr;
 288     }
 289
 290     netboot_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, ipl->netboot_fw);
 291     if (netboot_filename == NULL) {
 292         error_setg(errp, "Could not find network bootloader");
 293         goto unref_mr;
 294     }
 295
 296     img_size = load_elf_ram(netboot_filename, NULL, NULL, &ipl->start_addr,
 297                             NULL, NULL, 1, EM_S390, 0, 0, NULL, false);
 298
 299     if (img_size < 0) {
 300         img_size = load_image_size(netboot_filename, ram_ptr, ram_size);
 301         ipl->start_addr = KERN_IMAGE_START;
 302     }
 303
 304     if (img_size < 0) {
 305         error_setg(errp, "Failed to load network bootloader");
 306     }
 307
 308     g_free(netboot_filename);
 309
 310 unref_mr:
 311     memory_region_unref(mr);
 312     return img_size;
 313 }
 314
 315 static bool is_virtio_net_device(IplParameterBlock *iplb)
 316 {
 317     uint8_t cssid;
 318     uint8_t ssid;
 319     uint16_t devno;
 320     uint16_t schid;
 321     SubchDev *sch = NULL;
 322
 323     if (iplb->pbt != S390_IPL_TYPE_CCW) {
 324         return false;
 325     }
 326
 327     devno = be16_to_cpu(iplb->ccw.devno);
 328     ssid = iplb->ccw.ssid & 3;
 329
 330     for (schid = 0; schid < MAX_SCHID; schid++) {
 331         for (cssid = 0; cssid < MAX_CSSID; cssid++) {
 332             sch = css_find_subch(1, cssid, ssid, schid);
 333
 334             if (sch && sch->devno == devno) {
 335                 return sch->id.cu_model == VIRTIO_ID_NET;
 336             }
 337         }
 338     }
 339     return false;
 340 }
 341
 342 void s390_ipl_update_diag308(IplParameterBlock *iplb)
 343 {
 344     S390IPLState *ipl = get_ipl_device();
 345
 346     ipl->iplb = *iplb;
 347     ipl->iplb_valid = true;
 348     ipl->netboot = is_virtio_net_device(iplb);
 349 }
 350
 351 IplParameterBlock *s390_ipl_get_iplb(void)
 352 {
 353     S390IPLState *ipl = get_ipl_device();
 354
 355     if (!ipl->iplb_valid) {
 356         return NULL;
 357     }
 358     return &ipl->iplb;
 359 }
 360
 361 void s390_reipl_request(void)
 362 {
 363     S390IPLState *ipl = get_ipl_device();
 364
 365     ipl->reipl_requested = true;
 366     qemu_system_reset_request();
 367 }
 368
 369 void s390_ipl_prepare_cpu(S390CPU *cpu)
 370 {
 371     S390IPLState *ipl = get_ipl_device();
 372     Error *err = NULL;
 373
 374     cpu->env.psw.addr = ipl->start_addr;
 375     cpu->env.psw.mask = IPL_PSW_MASK;
 376
 377     if (!ipl->kernel || ipl->iplb_valid) {
 378         cpu->env.psw.addr = ipl->bios_start_addr;
 379         if (!ipl->iplb_valid) {
 380             ipl->iplb_valid = s390_gen_initial_iplb(ipl);
 381         }
 382     }
 383     if (ipl->netboot) {
 384         if (load_netboot_image(&err) < 0) {
 385             error_report_err(err);
 386             vm_stop(RUN_STATE_INTERNAL_ERROR);
 387         }
 388         ipl->iplb.ccw.netboot_start_addr = ipl->start_addr;
 389     }
 390 }
 391
 392 static void s390_ipl_reset(DeviceState *dev)
 393 {
 394     S390IPLState *ipl = S390_IPL(dev);
 395
 396     if (!ipl->reipl_requested) {
 397         ipl->iplb_valid = false;
 398         memset(&ipl->iplb, 0, sizeof(IplParameterBlock));
 399     }
 400     ipl->reipl_requested = false;
 401 }
 402
 403 static void s390_ipl_class_init(ObjectClass *klass, void *data)
 404 {
 405     DeviceClass *dc = DEVICE_CLASS(klass);
 406
 407     dc->realize = s390_ipl_realize;
 408     dc->props = s390_ipl_properties;
 409     dc->reset = s390_ipl_reset;
 410     dc->vmsd = &vmstate_ipl;
 411     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 412 }
 413
 414 static const TypeInfo s390_ipl_info = {
 415     .class_init = s390_ipl_class_init,
 416     .parent = TYPE_DEVICE,
 417     .name  = TYPE_S390_IPL,
 418     .instance_size  = sizeof(S390IPLState),
 419 };
 420
 421 static void s390_ipl_register_types(void)
 422 {
 423     type_register_static(&s390_ipl_info);
 424 }
 425
 426 type_init(s390_ipl_register_types)