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             virtio_queue_notify(dev->vdev, i);
  81         } else {
  82             r = -EINVAL;
  83         }
  84     } else {
  85         /* Early printk */
  86     }
  87     return r;
  88 }
  89
  90 static int s390_virtio_hcall_reset(const uint64_t *args)
  91 {
  92     uint64_t mem = args[0];
  93     VirtIOS390Device *dev;
  94
  95     dev = s390_virtio_bus_find_mem(s390_bus, mem);
  96     if (dev == NULL) {
  97         return -EINVAL;
  98     }
  99     virtio_reset(dev->vdev);
 100     stb_phys(&address_space_memory, dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
 101     s390_virtio_device_sync(dev);
 102     s390_virtio_reset_idx(dev);
 103
 104     return 0;
 105 }
 106
 107 static int s390_virtio_hcall_set_status(const uint64_t *args)
 108 {
 109     uint64_t mem = args[0];
 110     int r = 0;
 111     VirtIOS390Device *dev;
 112
 113     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 114     if (dev) {
 115         s390_virtio_device_update_status(dev);
 116     } else {
 117         r = -EINVAL;
 118     }
 119     return r;
 120 }
 121
 122 static void s390_virtio_register_hcalls(void)
 123 {
 124     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 125                                    s390_virtio_hcall_notify);
 126     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 127                                    s390_virtio_hcall_reset);
 128     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 129                                    s390_virtio_hcall_set_status);
 130 }
 131
 132 void s390_init_ipl_dev(const char *kernel_filename,
 133                        const char *kernel_cmdline,
 134                        const char *initrd_filename,
 135                        const char *firmware,
 136                        bool enforce_bios)
 137 {
 138     DeviceState *dev;
 139
 140     dev  = qdev_create(NULL, "s390-ipl");
 141     if (kernel_filename) {
 142         qdev_prop_set_string(dev, "kernel", kernel_filename);
 143     }
 144     if (initrd_filename) {
 145         qdev_prop_set_string(dev, "initrd", initrd_filename);
 146     }
 147     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 148     qdev_prop_set_string(dev, "firmware", firmware);
 149     qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
 150     object_property_add_child(qdev_get_machine(), "s390-ipl",
 151                               OBJECT(dev), NULL);
 152     qdev_init_nofail(dev);
 153 }
 154
 155 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 156 {
 157     int i;
 158
 159     if (cpu_model == NULL) {
 160         cpu_model = "host";
 161     }
 162
 163     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 164
 165     for (i = 0; i < smp_cpus; i++) {
 166         S390CPU *cpu;
 167         CPUState *cs;
 168
 169         cpu = cpu_s390x_init(cpu_model);
 170         cs = CPU(cpu);
 171
 172         ipi_states[i] = cpu;
 173         cs->halted = 1;
 174         cs->exception_index = EXCP_HLT;
 175         cpu->env.storage_keys = storage_keys;
 176     }
 177 }
 178
 179
 180 void s390_create_virtio_net(BusState *bus, const char *name)
 181 {
 182     int i;
 183
 184     for (i = 0; i < nb_nics; i++) {
 185         NICInfo *nd = &nd_table[i];
 186         DeviceState *dev;
 187
 188         if (!nd->model) {
 189             nd->model = g_strdup("virtio");
 190         }
 191
 192         if (strcmp(nd->model, "virtio")) {
 193             fprintf(stderr, "S390 only supports VirtIO nics\n");
 194             exit(1);
 195         }
 196
 197         dev = qdev_create(bus, name);
 198         qdev_set_nic_properties(dev, nd);
 199         qdev_init_nofail(dev);
 200     }
 201 }
 202
 203 void gtod_save(QEMUFile *f, void *opaque)
 204 {
 205     uint64_t tod_low;
 206     uint8_t tod_high;
 207     int r;
 208
 209     r = s390_get_clock(&tod_high, &tod_low);
 210     if (r) {
 211         fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
 212                         "Error code %d. Guest clock will not be migrated "
 213                         "which could cause the guest to hang.\n", r);
 214         qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
 215         return;
 216     }
 217
 218     qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
 219     qemu_put_byte(f, tod_high);
 220     qemu_put_be64(f, tod_low);
 221 }
 222
 223 int gtod_load(QEMUFile *f, void *opaque, int version_id)
 224 {
 225     uint64_t tod_low;
 226     uint8_t tod_high;
 227     int r;
 228
 229     if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
 230         fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
 231                         "cause the guest to hang.\n");
 232         return 0;
 233     }
 234
 235     tod_high = qemu_get_byte(f);
 236     tod_low = qemu_get_be64(f);
 237
 238     r = s390_set_clock(&tod_high, &tod_low);
 239     if (r) {
 240         fprintf(stderr, "WARNING: Unable to set guest clock value. "
 241                         "s390_get_clock returned error %d. This could cause "
 242                         "the guest to hang.\n", r);
 243     }
 244
 245     return 0;
 246 }
 247
 248 /* PC hardware initialisation */
 249 static void s390_init(MachineState *machine)
 250 {
 251     ram_addr_t my_ram_size = machine->ram_size;
 252     MemoryRegion *sysmem = get_system_memory();
 253     MemoryRegion *ram = g_new(MemoryRegion, 1);
 254     int increment_size = 20;
 255     uint8_t *storage_keys;
 256     void *virtio_region;
 257     hwaddr virtio_region_len;
 258     hwaddr virtio_region_start;
 259
 260     /*
 261      * The storage increment size is a multiple of 1M and is a power of 2.
 262      * The number of storage increments must be MAX_STORAGE_INCREMENTS or
 263      * fewer.
 264      */
 265     while ((my_ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
 266         increment_size++;
 267     }
 268     my_ram_size = my_ram_size >> increment_size << increment_size;
 269
 270     /* let's propagate the changed ram size into the global variable. */
 271     ram_size = my_ram_size;
 272
 273     /* get a BUS */
 274     s390_bus = s390_virtio_bus_init(&my_ram_size);
 275     s390_sclp_init();
 276     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 277                       machine->initrd_filename, ZIPL_FILENAME, false);
 278     s390_flic_init();
 279
 280     /* register hypercalls */
 281     s390_virtio_register_hcalls();
 282
 283     /* allocate RAM */
 284     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
 285     vmstate_register_ram_global(ram);
 286     memory_region_add_subregion(sysmem, 0, ram);
 287
 288     /* clear virtio region */
 289     virtio_region_len = my_ram_size - ram_size;
 290     virtio_region_start = ram_size;
 291     virtio_region = cpu_physical_memory_map(virtio_region_start,
 292                                             &virtio_region_len, true);
 293     memset(virtio_region, 0, virtio_region_len);
 294     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 295                               virtio_region_len);
 296
 297     /* allocate storage keys */
 298     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 299
 300     /* init CPUs */
 301     s390_init_cpus(machine->cpu_model, storage_keys);
 302
 303     /* Create VirtIO network adapters */
 304     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 305
 306     /* Register savevm handler for guest TOD clock */
 307     register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
 308 }
 309
 310 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
 311 {
 312     CPUState *cs = qemu_get_cpu(cpu_index);
 313
 314     if (s390_cpu_restart(S390_CPU(cs))) {
 315         error_set(errp, QERR_UNSUPPORTED);
 316     }
 317 }
 318
 319 static void s390_machine_class_init(ObjectClass *oc, void *data)
 320 {
 321     MachineClass *mc = MACHINE_CLASS(oc);
 322     NMIClass *nc = NMI_CLASS(oc);
 323
 324     mc->name = "s390-virtio";
 325     mc->alias = "s390";
 326     mc->desc = "VirtIO based S390 machine";
 327     mc->init = s390_init;
 328     mc->block_default_type = IF_VIRTIO;
 329     mc->max_cpus = 255;
 330     mc->no_serial = 1;
 331     mc->no_parallel = 1;
 332     mc->use_virtcon = 1;
 333     mc->no_floppy = 1;
 334     mc->no_cdrom = 1;
 335     mc->no_sdcard = 1;
 336     mc->is_default = 1;
 337     nc->nmi_monitor_handler = s390_nmi;
 338 }
 339
 340 static const TypeInfo s390_machine_info = {
 341     .name          = TYPE_S390_MACHINE,
 342     .parent        = TYPE_MACHINE,
 343     .class_init    = s390_machine_class_init,
 344     .interfaces = (InterfaceInfo[]) {
 345         { TYPE_NMI },
 346         { }
 347     },
 348 };
 349
 350 static void s390_machine_register_types(void)
 351 {
 352     type_register_static(&s390_machine_info);
 353 }
 354
 355 type_init(s390_machine_register_types)