hw/s390x/s390-virtio.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  * Copyright IBM Corp 2012
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * Contributions after 2012-10-29 are licensed under the terms of the
  18  * GNU GPL, version 2 or (at your option) any later version.
  19  *
  20  * You should have received a copy of the GNU (Lesser) General Public
  21  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "hw/hw.h"
  25 #include "sysemu/block-backend.h"
  26 #include "sysemu/blockdev.h"
  27 #include "sysemu/sysemu.h"
  28 #include "net/net.h"
  29 #include "hw/boards.h"
  30 #include "monitor/monitor.h"
  31 #include "hw/loader.h"
  32 #include "hw/virtio/virtio.h"
  33 #include "hw/sysbus.h"
  34 #include "sysemu/kvm.h"
  35 #include "exec/address-spaces.h"
  36
  37 #include "hw/s390x/s390-virtio-bus.h"
  38 #include "hw/s390x/sclp.h"
  39 #include "hw/s390x/s390_flic.h"
  40 #include "hw/s390x/s390-virtio.h"
  41 #include "cpu.h"
  42
  43 //#define DEBUG_S390
  44
  45 #ifdef DEBUG_S390
  46 #define DPRINTF(fmt, ...) \
  47     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  48 #else
  49 #define DPRINTF(fmt, ...) \
  50     do { } while (0)
  51 #endif
  52
  53 #define MAX_BLK_DEVS                    10
  54 #define ZIPL_FILENAME                   "s390-zipl.rom"
  55 #define TYPE_S390_MACHINE               "s390-machine"
  56
  57 #define S390_TOD_CLOCK_VALUE_MISSING    0x00
  58 #define S390_TOD_CLOCK_VALUE_PRESENT    0x01
  59
  60 static VirtIOS390Bus *s390_bus;
  61 static S390CPU **ipi_states;
  62
  63 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  64 {
  65     if (cpu_addr >= smp_cpus) {
  66         return NULL;
  67     }
  68
  69     return ipi_states[cpu_addr];
  70 }
  71
  72 static int s390_virtio_hcall_notify(const uint64_t *args)
  73 {
  74     uint64_t mem = args[0];
  75     int r = 0, i;
  76
  77     if (mem > ram_size) {
  78         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  79         if (dev) {
  80             /*
  81              * Older kernels will use the virtqueue before setting DRIVER_OK.
  82              * In this case the feature bits are not yet up to date, meaning
  83              * that several funny things can happen, e.g. the guest thinks
  84              * EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
  85              * and status sync.
  86              */
  87             if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
  88                 s390_virtio_device_update_status(dev);
  89             }
  90             virtio_queue_notify(dev->vdev, i);
  91         } else {
  92             r = -EINVAL;
  93         }
  94     } else {
  95         /* Early printk */
  96     }
  97     return r;
  98 }
  99
 100 static int s390_virtio_hcall_reset(const uint64_t *args)
 101 {
 102     uint64_t mem = args[0];
 103     VirtIOS390Device *dev;
 104
 105     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 106     if (dev == NULL) {
 107         return -EINVAL;
 108     }
 109     virtio_reset(dev->vdev);
 110     address_space_stb(&address_space_memory,
 111                       dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0,
 112                       MEMTXATTRS_UNSPECIFIED, NULL);
 113     s390_virtio_device_sync(dev);
 114     s390_virtio_reset_idx(dev);
 115
 116     return 0;
 117 }
 118
 119 static int s390_virtio_hcall_set_status(const uint64_t *args)
 120 {
 121     uint64_t mem = args[0];
 122     int r = 0;
 123     VirtIOS390Device *dev;
 124
 125     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 126     if (dev) {
 127         s390_virtio_device_update_status(dev);
 128     } else {
 129         r = -EINVAL;
 130     }
 131     return r;
 132 }
 133
 134 static void s390_virtio_register_hcalls(void)
 135 {
 136     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 137                                    s390_virtio_hcall_notify);
 138     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 139                                    s390_virtio_hcall_reset);
 140     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 141                                    s390_virtio_hcall_set_status);
 142 }
 143
 144 void s390_init_ipl_dev(const char *kernel_filename,
 145                        const char *kernel_cmdline,
 146                        const char *initrd_filename,
 147                        const char *firmware,
 148                        bool enforce_bios)
 149 {
 150     DeviceState *dev;
 151
 152     dev  = qdev_create(NULL, "s390-ipl");
 153     if (kernel_filename) {
 154         qdev_prop_set_string(dev, "kernel", kernel_filename);
 155     }
 156     if (initrd_filename) {
 157         qdev_prop_set_string(dev, "initrd", initrd_filename);
 158     }
 159     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 160     qdev_prop_set_string(dev, "firmware", firmware);
 161     qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
 162     object_property_add_child(qdev_get_machine(), "s390-ipl",
 163                               OBJECT(dev), NULL);
 164     qdev_init_nofail(dev);
 165 }
 166
 167 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 168 {
 169     int i;
 170
 171     if (cpu_model == NULL) {
 172         cpu_model = "host";
 173     }
 174
 175     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 176
 177     for (i = 0; i < smp_cpus; i++) {
 178         S390CPU *cpu;
 179         CPUState *cs;
 180
 181         cpu = cpu_s390x_init(cpu_model);
 182         cs = CPU(cpu);
 183
 184         ipi_states[i] = cpu;
 185         cs->halted = 1;
 186         cs->exception_index = EXCP_HLT;
 187         cpu->env.storage_keys = storage_keys;
 188     }
 189 }
 190
 191
 192 void s390_create_virtio_net(BusState *bus, const char *name)
 193 {
 194     int i;
 195
 196     for (i = 0; i < nb_nics; i++) {
 197         NICInfo *nd = &nd_table[i];
 198         DeviceState *dev;
 199
 200         if (!nd->model) {
 201             nd->model = g_strdup("virtio");
 202         }
 203
 204         if (strcmp(nd->model, "virtio")) {
 205             fprintf(stderr, "S390 only supports VirtIO nics\n");
 206             exit(1);
 207         }
 208
 209         dev = qdev_create(bus, name);
 210         qdev_set_nic_properties(dev, nd);
 211         qdev_init_nofail(dev);
 212     }
 213 }
 214
 215 void gtod_save(QEMUFile *f, void *opaque)
 216 {
 217     uint64_t tod_low;
 218     uint8_t tod_high;
 219     int r;
 220
 221     r = s390_get_clock(&tod_high, &tod_low);
 222     if (r) {
 223         fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
 224                         "Error code %d. Guest clock will not be migrated "
 225                         "which could cause the guest to hang.\n", r);
 226         qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
 227         return;
 228     }
 229
 230     qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
 231     qemu_put_byte(f, tod_high);
 232     qemu_put_be64(f, tod_low);
 233 }
 234
 235 int gtod_load(QEMUFile *f, void *opaque, int version_id)
 236 {
 237     uint64_t tod_low;
 238     uint8_t tod_high;
 239     int r;
 240
 241     if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
 242         fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
 243                         "cause the guest to hang.\n");
 244         return 0;
 245     }
 246
 247     tod_high = qemu_get_byte(f);
 248     tod_low = qemu_get_be64(f);
 249
 250     r = s390_set_clock(&tod_high, &tod_low);
 251     if (r) {
 252         fprintf(stderr, "WARNING: Unable to set guest clock value. "
 253                         "s390_get_clock returned error %d. This could cause "
 254                         "the guest to hang.\n", r);
 255     }
 256
 257     return 0;
 258 }
 259
 260 /* PC hardware initialisation */
 261 static void s390_init(MachineState *machine)
 262 {
 263     ram_addr_t my_ram_size = machine->ram_size;
 264     MemoryRegion *sysmem = get_system_memory();
 265     MemoryRegion *ram = g_new(MemoryRegion, 1);
 266     int increment_size = 20;
 267     uint8_t *storage_keys;
 268     void *virtio_region;
 269     hwaddr virtio_region_len;
 270     hwaddr virtio_region_start;
 271
 272     /*
 273      * The storage increment size is a multiple of 1M and is a power of 2.
 274      * The number of storage increments must be MAX_STORAGE_INCREMENTS or
 275      * fewer.
 276      */
 277     while ((my_ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
 278         increment_size++;
 279     }
 280     my_ram_size = my_ram_size >> increment_size << increment_size;
 281
 282     /* let's propagate the changed ram size into the global variable. */
 283     ram_size = my_ram_size;
 284
 285     /* get a BUS */
 286     s390_bus = s390_virtio_bus_init(&my_ram_size);
 287     s390_sclp_init();
 288     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 289                       machine->initrd_filename, ZIPL_FILENAME, false);
 290     s390_flic_init();
 291
 292     /* register hypercalls */
 293     s390_virtio_register_hcalls();
 294
 295     /* allocate RAM */
 296     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
 297     vmstate_register_ram_global(ram);
 298     memory_region_add_subregion(sysmem, 0, ram);
 299
 300     /* clear virtio region */
 301     virtio_region_len = my_ram_size - ram_size;
 302     virtio_region_start = ram_size;
 303     virtio_region = cpu_physical_memory_map(virtio_region_start,
 304                                             &virtio_region_len, true);
 305     memset(virtio_region, 0, virtio_region_len);
 306     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 307                               virtio_region_len);
 308
 309     /* allocate storage keys */
 310     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 311
 312     /* init CPUs */
 313     s390_init_cpus(machine->cpu_model, storage_keys);
 314
 315     /* Create VirtIO network adapters */
 316     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 317
 318     /* Register savevm handler for guest TOD clock */
 319     register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
 320 }
 321
 322 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
 323 {
 324     CPUState *cs = qemu_get_cpu(cpu_index);
 325
 326     if (s390_cpu_restart(S390_CPU(cs))) {
 327         error_set(errp, QERR_UNSUPPORTED);
 328     }
 329 }
 330
 331 static void s390_machine_class_init(ObjectClass *oc, void *data)
 332 {
 333     MachineClass *mc = MACHINE_CLASS(oc);
 334     NMIClass *nc = NMI_CLASS(oc);
 335
 336     mc->name = "s390-virtio";
 337     mc->alias = "s390";
 338     mc->desc = "VirtIO based S390 machine";
 339     mc->init = s390_init;
 340     mc->block_default_type = IF_VIRTIO;
 341     mc->max_cpus = 255;
 342     mc->no_serial = 1;
 343     mc->no_parallel = 1;
 344     mc->use_virtcon = 1;
 345     mc->no_floppy = 1;
 346     mc->no_cdrom = 1;
 347     mc->no_sdcard = 1;
 348     mc->is_default = 1;
 349     nc->nmi_monitor_handler = s390_nmi;
 350 }
 351
 352 static const TypeInfo s390_machine_info = {
 353     .name          = TYPE_S390_MACHINE,
 354     .parent        = TYPE_MACHINE,
 355     .class_init    = s390_machine_class_init,
 356     .interfaces = (InterfaceInfo[]) {
 357         { TYPE_NMI },
 358         { }
 359     },
 360 };
 361
 362 static void s390_machine_register_types(void)
 363 {
 364     type_register_static(&s390_machine_info);
 365 }
 366
 367 type_init(s390_machine_register_types)