hw/s390-virtio.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw.h"
  21 #include "block.h"
  22 #include "blockdev.h"
  23 #include "sysemu.h"
  24 #include "net.h"
  25 #include "boards.h"
  26 #include "monitor.h"
  27 #include "loader.h"
  28 #include "elf.h"
  29 #include "hw/virtio.h"
  30 #include "hw/sysbus.h"
  31 #include "kvm.h"
  32 #include "exec-memory.h"
  33
  34 #include "hw/s390-virtio-bus.h"
  35 #include "hw/s390x/sclp.h"
  36
  37 //#define DEBUG_S390
  38
  39 #ifdef DEBUG_S390
  40 #define dprintf(fmt, ...) \
  41     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  42 #else
  43 #define dprintf(fmt, ...) \
  44     do { } while (0)
  45 #endif
  46
  47 #define KVM_S390_VIRTIO_NOTIFY          0
  48 #define KVM_S390_VIRTIO_RESET           1
  49 #define KVM_S390_VIRTIO_SET_STATUS      2
  50
  51 #define KERN_IMAGE_START                0x010000UL
  52 #define KERN_PARM_AREA                  0x010480UL
  53 #define INITRD_START                    0x800000UL
  54 #define INITRD_PARM_START               0x010408UL
  55 #define INITRD_PARM_SIZE                0x010410UL
  56 #define PARMFILE_START                  0x001000UL
  57
  58 #define ZIPL_START                      0x009000UL
  59 #define ZIPL_LOAD_ADDR                  0x009000UL
  60 #define ZIPL_FILENAME                   "s390-zipl.rom"
  61
  62 #define MAX_BLK_DEVS                    10
  63
  64 static VirtIOS390Bus *s390_bus;
  65 static S390CPU **ipi_states;
  66
  67 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  68 {
  69     if (cpu_addr >= smp_cpus) {
  70         return NULL;
  71     }
  72
  73     return ipi_states[cpu_addr];
  74 }
  75
  76 int s390_virtio_hypercall(CPUS390XState *env, uint64_t mem, uint64_t hypercall)
  77 {
  78     int r = 0, i;
  79
  80     dprintf("KVM hypercall: %ld\n", hypercall);
  81     switch (hypercall) {
  82     case KVM_S390_VIRTIO_NOTIFY:
  83         if (mem > ram_size) {
  84             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  85                                                                mem, &i);
  86             if (dev) {
  87                 virtio_queue_notify(dev->vdev, i);
  88             } else {
  89                 r = -EINVAL;
  90             }
  91         } else {
  92             /* Early printk */
  93         }
  94         break;
  95     case KVM_S390_VIRTIO_RESET:
  96     {
  97         VirtIOS390Device *dev;
  98
  99         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 100         virtio_reset(dev->vdev);
 101         stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
 102         s390_virtio_device_sync(dev);
 103         s390_virtio_reset_idx(dev);
 104         break;
 105     }
 106     case KVM_S390_VIRTIO_SET_STATUS:
 107     {
 108         VirtIOS390Device *dev;
 109
 110         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 111         if (dev) {
 112             s390_virtio_device_update_status(dev);
 113         } else {
 114             r = -EINVAL;
 115         }
 116         break;
 117     }
 118     default:
 119         r = -EINVAL;
 120         break;
 121     }
 122
 123     return r;
 124 }
 125
 126 /*
 127  * The number of running CPUs. On s390 a shutdown is the state of all CPUs
 128  * being either stopped or disabled (for interrupts) waiting. We have to
 129  * track this number to call the shutdown sequence accordingly. This
 130  * number is modified either on startup or while holding the big qemu lock.
 131  */
 132 static unsigned s390_running_cpus;
 133
 134 void s390_add_running_cpu(CPUS390XState *env)
 135 {
 136     if (env->halted) {
 137         s390_running_cpus++;
 138         env->halted = 0;
 139         env->exception_index = -1;
 140     }
 141 }
 142
 143 unsigned s390_del_running_cpu(CPUS390XState *env)
 144 {
 145     if (env->halted == 0) {
 146         assert(s390_running_cpus >= 1);
 147         s390_running_cpus--;
 148         env->halted = 1;
 149         env->exception_index = EXCP_HLT;
 150     }
 151     return s390_running_cpus;
 152 }
 153
 154 /* PC hardware initialisation */
 155 static void s390_init(QEMUMachineInitArgs *args)
 156 {
 157     ram_addr_t my_ram_size = args->ram_size;
 158     const char *cpu_model = args->cpu_model;
 159     const char *kernel_filename = args->kernel_filename;
 160     const char *kernel_cmdline = args->kernel_cmdline;
 161     const char *initrd_filename = args->initrd_filename;
 162     CPUS390XState *env = NULL;
 163     MemoryRegion *sysmem = get_system_memory();
 164     MemoryRegion *ram = g_new(MemoryRegion, 1);
 165     ram_addr_t kernel_size = 0;
 166     ram_addr_t initrd_offset;
 167     ram_addr_t initrd_size = 0;
 168     int shift = 0;
 169     uint8_t *storage_keys;
 170     void *virtio_region;
 171     hwaddr virtio_region_len;
 172     hwaddr virtio_region_start;
 173     int i;
 174
 175     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 176        guests > 64GB can be specified in 2MB steps etc. */
 177     while ((my_ram_size >> (20 + shift)) > 65535) {
 178         shift++;
 179     }
 180     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 181
 182     /* lets propagate the changed ram size into the global variable. */
 183     ram_size = my_ram_size;
 184
 185     /* get a BUS */
 186     s390_bus = s390_virtio_bus_init(&my_ram_size);
 187     s390_sclp_init();
 188
 189     /* allocate RAM */
 190     memory_region_init_ram(ram, "s390.ram", my_ram_size);
 191     vmstate_register_ram_global(ram);
 192     memory_region_add_subregion(sysmem, 0, ram);
 193
 194     /* clear virtio region */
 195     virtio_region_len = my_ram_size - ram_size;
 196     virtio_region_start = ram_size;
 197     virtio_region = cpu_physical_memory_map(virtio_region_start,
 198                                             &virtio_region_len, true);
 199     memset(virtio_region, 0, virtio_region_len);
 200     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 201                               virtio_region_len);
 202
 203     /* allocate storage keys */
 204     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 205
 206     /* init CPUs */
 207     if (cpu_model == NULL) {
 208         cpu_model = "host";
 209     }
 210
 211     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 212
 213     for (i = 0; i < smp_cpus; i++) {
 214         S390CPU *cpu;
 215         CPUS390XState *tmp_env;
 216
 217         cpu = cpu_s390x_init(cpu_model);
 218         tmp_env = &cpu->env;
 219         if (!env) {
 220             env = tmp_env;
 221         }
 222         ipi_states[i] = cpu;
 223         tmp_env->halted = 1;
 224         tmp_env->exception_index = EXCP_HLT;
 225         tmp_env->storage_keys = storage_keys;
 226     }
 227
 228     /* One CPU has to run */
 229     s390_add_running_cpu(env);
 230
 231     if (kernel_filename) {
 232
 233         kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, NULL,
 234                                NULL, 1, ELF_MACHINE, 0);
 235         if (kernel_size == -1UL) {
 236             kernel_size = load_image_targphys(kernel_filename, 0, ram_size);
 237         }
 238         if (kernel_size == -1UL) {
 239             fprintf(stderr, "qemu: could not load kernel '%s'\n",
 240                     kernel_filename);
 241             exit(1);
 242         }
 243         /*
 244          * we can not rely on the ELF entry point, since up to 3.2 this
 245          * value was 0x800 (the SALIPL loader) and it wont work. For
 246          * all (Linux) cases 0x10000 (KERN_IMAGE_START) should be fine.
 247          */
 248         env->psw.addr = KERN_IMAGE_START;
 249         env->psw.mask = 0x0000000180000000ULL;
 250     } else {
 251         ram_addr_t bios_size = 0;
 252         char *bios_filename;
 253
 254         /* Load zipl bootloader */
 255         if (bios_name == NULL) {
 256             bios_name = ZIPL_FILENAME;
 257         }
 258
 259         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 260         bios_size = load_image_targphys(bios_filename, ZIPL_LOAD_ADDR, 4096);
 261         g_free(bios_filename);
 262
 263         if ((long)bios_size < 0) {
 264             hw_error("could not load bootloader '%s'\n", bios_name);
 265         }
 266
 267         if (bios_size > 4096) {
 268             hw_error("stage1 bootloader is > 4k\n");
 269         }
 270
 271         env->psw.addr = ZIPL_START;
 272         env->psw.mask = 0x0000000180000000ULL;
 273     }
 274
 275     if (initrd_filename) {
 276         initrd_offset = INITRD_START;
 277         while (kernel_size + 0x100000 > initrd_offset) {
 278             initrd_offset += 0x100000;
 279         }
 280         initrd_size = load_image_targphys(initrd_filename, initrd_offset,
 281                                           ram_size - initrd_offset);
 282         if (initrd_size == -1UL) {
 283             fprintf(stderr, "qemu: could not load initrd '%s'\n",
 284                     initrd_filename);
 285             exit(1);
 286         }
 287
 288         /* we have to overwrite values in the kernel image, which are "rom" */
 289         stq_p(rom_ptr(INITRD_PARM_START), initrd_offset);
 290         stq_p(rom_ptr(INITRD_PARM_SIZE), initrd_size);
 291     }
 292
 293     if (rom_ptr(KERN_PARM_AREA)) {
 294         /* we have to overwrite values in the kernel image, which are "rom" */
 295         memcpy(rom_ptr(KERN_PARM_AREA), kernel_cmdline,
 296                strlen(kernel_cmdline) + 1);
 297     }
 298
 299     /* Create VirtIO network adapters */
 300     for(i = 0; i < nb_nics; i++) {
 301         NICInfo *nd = &nd_table[i];
 302         DeviceState *dev;
 303
 304         if (!nd->model) {
 305             nd->model = g_strdup("virtio");
 306         }
 307
 308         if (strcmp(nd->model, "virtio")) {
 309             fprintf(stderr, "S390 only supports VirtIO nics\n");
 310             exit(1);
 311         }
 312
 313         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 314         qdev_set_nic_properties(dev, nd);
 315         qdev_init_nofail(dev);
 316     }
 317
 318     /* Create VirtIO disk drives */
 319     for(i = 0; i < MAX_BLK_DEVS; i++) {
 320         DriveInfo *dinfo;
 321         DeviceState *dev;
 322
 323         dinfo = drive_get(IF_IDE, 0, i);
 324         if (!dinfo) {
 325             continue;
 326         }
 327
 328         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 329         qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
 330         qdev_init_nofail(dev);
 331     }
 332 }
 333
 334 static QEMUMachine s390_machine = {
 335     .name = "s390-virtio",
 336     .alias = "s390",
 337     .desc = "VirtIO based S390 machine",
 338     .init = s390_init,
 339     .no_cdrom = 1,
 340     .no_floppy = 1,
 341     .no_serial = 1,
 342     .no_parallel = 1,
 343     .no_sdcard = 1,
 344     .use_virtcon = 1,
 345     .max_cpus = 255,
 346     .is_default = 1,
 347 };
 348
 349 static void s390_machine_init(void)
 350 {
 351     qemu_register_machine(&s390_machine);
 352 }
 353
 354 machine_init(s390_machine_init);