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