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 "qapi/qmp/qerror.h"
  26 #include "qemu/error-report.h"
  27 #include "sysemu/block-backend.h"
  28 #include "sysemu/blockdev.h"
  29 #include "sysemu/sysemu.h"
  30 #include "net/net.h"
  31 #include "hw/boards.h"
  32 #include "hw/loader.h"
  33 #include "hw/virtio/virtio.h"
  34 #include "hw/sysbus.h"
  35 #include "sysemu/kvm.h"
  36 #include "exec/address-spaces.h"
  37
  38 #include "hw/s390x/s390-virtio-bus.h"
  39 #include "hw/s390x/sclp.h"
  40 #include "hw/s390x/s390_flic.h"
  41 #include "hw/s390x/s390-virtio.h"
  42 #include "hw/s390x/storage-keys.h"
  43 #include "hw/s390x/ipl.h"
  44 #include "cpu.h"
  45
  46 //#define DEBUG_S390
  47
  48 #ifdef DEBUG_S390
  49 #define DPRINTF(fmt, ...) \
  50     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  51 #else
  52 #define DPRINTF(fmt, ...) \
  53     do { } while (0)
  54 #endif
  55
  56 #define MAX_BLK_DEVS                    10
  57 #define ZIPL_FILENAME                   "s390-zipl.rom"
  58 #define S390_MACHINE                    "s390-virtio"
  59 #define TYPE_S390_MACHINE               MACHINE_TYPE_NAME(S390_MACHINE)
  60
  61 #define S390_TOD_CLOCK_VALUE_MISSING    0x00
  62 #define S390_TOD_CLOCK_VALUE_PRESENT    0x01
  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 static int s390_virtio_hcall_notify(const uint64_t *args)
  77 {
  78     uint64_t mem = args[0];
  79     int r = 0, i;
  80
  81     if (mem > ram_size) {
  82         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  83         if (dev) {
  84             /*
  85              * Older kernels will use the virtqueue before setting DRIVER_OK.
  86              * In this case the feature bits are not yet up to date, meaning
  87              * that several funny things can happen, e.g. the guest thinks
  88              * EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
  89              * and status sync.
  90              */
  91             if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
  92                 s390_virtio_device_update_status(dev);
  93             }
  94             virtio_queue_notify(dev->vdev, i);
  95         } else {
  96             r = -EINVAL;
  97         }
  98     } else {
  99         /* Early printk */
 100     }
 101     return r;
 102 }
 103
 104 static int s390_virtio_hcall_reset(const uint64_t *args)
 105 {
 106     uint64_t mem = args[0];
 107     VirtIOS390Device *dev;
 108
 109     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 110     if (dev == NULL) {
 111         return -EINVAL;
 112     }
 113     virtio_reset(dev->vdev);
 114     address_space_stb(&address_space_memory,
 115                       dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0,
 116                       MEMTXATTRS_UNSPECIFIED, NULL);
 117     s390_virtio_device_sync(dev);
 118     s390_virtio_reset_idx(dev);
 119
 120     return 0;
 121 }
 122
 123 static int s390_virtio_hcall_set_status(const uint64_t *args)
 124 {
 125     uint64_t mem = args[0];
 126     int r = 0;
 127     VirtIOS390Device *dev;
 128
 129     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 130     if (dev) {
 131         s390_virtio_device_update_status(dev);
 132     } else {
 133         r = -EINVAL;
 134     }
 135     return r;
 136 }
 137
 138 static void s390_virtio_register_hcalls(void)
 139 {
 140     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 141                                    s390_virtio_hcall_notify);
 142     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 143                                    s390_virtio_hcall_reset);
 144     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 145                                    s390_virtio_hcall_set_status);
 146 }
 147
 148 void s390_init_ipl_dev(const char *kernel_filename,
 149                        const char *kernel_cmdline,
 150                        const char *initrd_filename,
 151                        const char *firmware,
 152                        bool enforce_bios)
 153 {
 154     DeviceState *dev;
 155
 156     dev  = qdev_create(NULL, "s390-ipl");
 157     if (kernel_filename) {
 158         qdev_prop_set_string(dev, "kernel", kernel_filename);
 159     }
 160     if (initrd_filename) {
 161         qdev_prop_set_string(dev, "initrd", initrd_filename);
 162     }
 163     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 164     qdev_prop_set_string(dev, "firmware", firmware);
 165     qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
 166     object_property_add_child(qdev_get_machine(), "s390-ipl",
 167                               OBJECT(dev), NULL);
 168     qdev_init_nofail(dev);
 169 }
 170
 171 void s390_init_cpus(const char *cpu_model)
 172 {
 173     int i;
 174
 175     if (cpu_model == NULL) {
 176         cpu_model = "host";
 177     }
 178
 179     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 180
 181     for (i = 0; i < smp_cpus; i++) {
 182         S390CPU *cpu;
 183         CPUState *cs;
 184
 185         cpu = cpu_s390x_init(cpu_model);
 186         cs = CPU(cpu);
 187
 188         ipi_states[i] = cpu;
 189         cs->halted = 1;
 190         cs->exception_index = EXCP_HLT;
 191     }
 192 }
 193
 194
 195 void s390_create_virtio_net(BusState *bus, const char *name)
 196 {
 197     int i;
 198
 199     for (i = 0; i < nb_nics; i++) {
 200         NICInfo *nd = &nd_table[i];
 201         DeviceState *dev;
 202
 203         if (!nd->model) {
 204             nd->model = g_strdup("virtio");
 205         }
 206
 207         if (strcmp(nd->model, "virtio")) {
 208             fprintf(stderr, "S390 only supports VirtIO nics\n");
 209             exit(1);
 210         }
 211
 212         dev = qdev_create(bus, name);
 213         qdev_set_nic_properties(dev, nd);
 214         qdev_init_nofail(dev);
 215     }
 216 }
 217
 218 void gtod_save(QEMUFile *f, void *opaque)
 219 {
 220     uint64_t tod_low;
 221     uint8_t tod_high;
 222     int r;
 223
 224     r = s390_get_clock(&tod_high, &tod_low);
 225     if (r) {
 226         fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
 227                         "Error code %d. Guest clock will not be migrated "
 228                         "which could cause the guest to hang.\n", r);
 229         qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
 230         return;
 231     }
 232
 233     qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
 234     qemu_put_byte(f, tod_high);
 235     qemu_put_be64(f, tod_low);
 236 }
 237
 238 int gtod_load(QEMUFile *f, void *opaque, int version_id)
 239 {
 240     uint64_t tod_low;
 241     uint8_t tod_high;
 242     int r;
 243
 244     if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
 245         fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
 246                         "cause the guest to hang.\n");
 247         return 0;
 248     }
 249
 250     tod_high = qemu_get_byte(f);
 251     tod_low = qemu_get_be64(f);
 252
 253     r = s390_set_clock(&tod_high, &tod_low);
 254     if (r) {
 255         fprintf(stderr, "WARNING: Unable to set guest clock value. "
 256                         "s390_get_clock returned error %d. This could cause "
 257                         "the guest to hang.\n", r);
 258     }
 259
 260     return 0;
 261 }
 262
 263 /* PC hardware initialisation */
 264 static void s390_init(MachineState *machine)
 265 {
 266     ram_addr_t my_ram_size;
 267     void *virtio_region;
 268     hwaddr virtio_region_len;
 269     hwaddr virtio_region_start;
 270
 271     if (machine->ram_slots) {
 272         error_report("Memory hotplug not supported by the selected machine.");
 273         exit(EXIT_FAILURE);
 274     }
 275     s390_sclp_init();
 276     my_ram_size = machine->ram_size;
 277
 278     /* get a BUS */
 279     s390_bus = s390_virtio_bus_init(&my_ram_size);
 280     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 281                       machine->initrd_filename, ZIPL_FILENAME, false);
 282     s390_flic_init();
 283
 284     /* register hypercalls */
 285     s390_virtio_register_hcalls();
 286
 287     /* allocate RAM */
 288     s390_memory_init(my_ram_size);
 289
 290     /* clear virtio region */
 291     virtio_region_len = my_ram_size - ram_size;
 292     virtio_region_start = ram_size;
 293     virtio_region = cpu_physical_memory_map(virtio_region_start,
 294                                             &virtio_region_len, true);
 295     memset(virtio_region, 0, virtio_region_len);
 296     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 297                               virtio_region_len);
 298
 299     /* init CPUs */
 300     s390_init_cpus(machine->cpu_model);
 301
 302     /* Create VirtIO network adapters */
 303     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 304
 305     /* Register savevm handler for guest TOD clock */
 306     register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
 307 }
 308
 309 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
 310 {
 311     CPUState *cs = qemu_get_cpu(cpu_index);
 312
 313     if (s390_cpu_restart(S390_CPU(cs))) {
 314         error_setg(errp, QERR_UNSUPPORTED);
 315     }
 316 }
 317
 318 void s390_machine_reset(void)
 319 {
 320     S390CPU *ipl_cpu = S390_CPU(qemu_get_cpu(0));
 321
 322     qemu_devices_reset();
 323
 324     /* all cpus are stopped - configure and start the ipl cpu only */
 325     s390_ipl_prepare_cpu(ipl_cpu);
 326     s390_cpu_set_state(CPU_STATE_OPERATING, ipl_cpu);
 327 }
 328
 329 static void s390_machine_class_init(ObjectClass *oc, void *data)
 330 {
 331     MachineClass *mc = MACHINE_CLASS(oc);
 332     NMIClass *nc = NMI_CLASS(oc);
 333
 334     mc->alias = "s390";
 335     mc->desc = "VirtIO based S390 machine";
 336     mc->init = s390_init;
 337     mc->reset = s390_machine_reset;
 338     mc->block_default_type = IF_VIRTIO;
 339     mc->max_cpus = 255;
 340     mc->no_serial = 1;
 341     mc->no_parallel = 1;
 342     mc->use_virtcon = 1;
 343     mc->no_floppy = 1;
 344     mc->no_cdrom = 1;
 345     mc->no_sdcard = 1;
 346     nc->nmi_monitor_handler = s390_nmi;
 347 }
 348
 349 static const TypeInfo s390_machine_info = {
 350     .name          = TYPE_S390_MACHINE,
 351     .parent        = TYPE_MACHINE,
 352     .class_init    = s390_machine_class_init,
 353     .interfaces = (InterfaceInfo[]) {
 354         { TYPE_NMI },
 355         { }
 356     },
 357 };
 358
 359 static void s390_machine_register_types(void)
 360 {
 361     type_register_static(&s390_machine_info);
 362 }
 363
 364 type_init(s390_machine_register_types)