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 "cpu.h"
  44
  45 //#define DEBUG_S390
  46
  47 #ifdef DEBUG_S390
  48 #define DPRINTF(fmt, ...) \
  49     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  50 #else
  51 #define DPRINTF(fmt, ...) \
  52     do { } while (0)
  53 #endif
  54
  55 #define MAX_BLK_DEVS                    10
  56 #define ZIPL_FILENAME                   "s390-zipl.rom"
  57 #define TYPE_S390_MACHINE               "s390-machine"
  58
  59 #define S390_TOD_CLOCK_VALUE_MISSING    0x00
  60 #define S390_TOD_CLOCK_VALUE_PRESENT    0x01
  61
  62 static VirtIOS390Bus *s390_bus;
  63 static S390CPU **ipi_states;
  64
  65 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  66 {
  67     if (cpu_addr >= smp_cpus) {
  68         return NULL;
  69     }
  70
  71     return ipi_states[cpu_addr];
  72 }
  73
  74 static int s390_virtio_hcall_notify(const uint64_t *args)
  75 {
  76     uint64_t mem = args[0];
  77     int r = 0, i;
  78
  79     if (mem > ram_size) {
  80         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  81         if (dev) {
  82             /*
  83              * Older kernels will use the virtqueue before setting DRIVER_OK.
  84              * In this case the feature bits are not yet up to date, meaning
  85              * that several funny things can happen, e.g. the guest thinks
  86              * EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
  87              * and status sync.
  88              */
  89             if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
  90                 s390_virtio_device_update_status(dev);
  91             }
  92             virtio_queue_notify(dev->vdev, i);
  93         } else {
  94             r = -EINVAL;
  95         }
  96     } else {
  97         /* Early printk */
  98     }
  99     return r;
 100 }
 101
 102 static int s390_virtio_hcall_reset(const uint64_t *args)
 103 {
 104     uint64_t mem = args[0];
 105     VirtIOS390Device *dev;
 106
 107     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 108     if (dev == NULL) {
 109         return -EINVAL;
 110     }
 111     virtio_reset(dev->vdev);
 112     address_space_stb(&address_space_memory,
 113                       dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0,
 114                       MEMTXATTRS_UNSPECIFIED, NULL);
 115     s390_virtio_device_sync(dev);
 116     s390_virtio_reset_idx(dev);
 117
 118     return 0;
 119 }
 120
 121 static int s390_virtio_hcall_set_status(const uint64_t *args)
 122 {
 123     uint64_t mem = args[0];
 124     int r = 0;
 125     VirtIOS390Device *dev;
 126
 127     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 128     if (dev) {
 129         s390_virtio_device_update_status(dev);
 130     } else {
 131         r = -EINVAL;
 132     }
 133     return r;
 134 }
 135
 136 static void s390_virtio_register_hcalls(void)
 137 {
 138     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 139                                    s390_virtio_hcall_notify);
 140     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 141                                    s390_virtio_hcall_reset);
 142     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 143                                    s390_virtio_hcall_set_status);
 144 }
 145
 146 void s390_init_ipl_dev(const char *kernel_filename,
 147                        const char *kernel_cmdline,
 148                        const char *initrd_filename,
 149                        const char *firmware,
 150                        bool enforce_bios)
 151 {
 152     DeviceState *dev;
 153
 154     dev  = qdev_create(NULL, "s390-ipl");
 155     if (kernel_filename) {
 156         qdev_prop_set_string(dev, "kernel", kernel_filename);
 157     }
 158     if (initrd_filename) {
 159         qdev_prop_set_string(dev, "initrd", initrd_filename);
 160     }
 161     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 162     qdev_prop_set_string(dev, "firmware", firmware);
 163     qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
 164     object_property_add_child(qdev_get_machine(), "s390-ipl",
 165                               OBJECT(dev), NULL);
 166     qdev_init_nofail(dev);
 167 }
 168
 169 void s390_init_cpus(const char *cpu_model)
 170 {
 171     int i;
 172
 173     if (cpu_model == NULL) {
 174         cpu_model = "host";
 175     }
 176
 177     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 178
 179     for (i = 0; i < smp_cpus; i++) {
 180         S390CPU *cpu;
 181         CPUState *cs;
 182
 183         cpu = cpu_s390x_init(cpu_model);
 184         cs = CPU(cpu);
 185
 186         ipi_states[i] = cpu;
 187         cs->halted = 1;
 188         cs->exception_index = EXCP_HLT;
 189     }
 190 }
 191
 192
 193 void s390_create_virtio_net(BusState *bus, const char *name)
 194 {
 195     int i;
 196
 197     for (i = 0; i < nb_nics; i++) {
 198         NICInfo *nd = &nd_table[i];
 199         DeviceState *dev;
 200
 201         if (!nd->model) {
 202             nd->model = g_strdup("virtio");
 203         }
 204
 205         if (strcmp(nd->model, "virtio")) {
 206             fprintf(stderr, "S390 only supports VirtIO nics\n");
 207             exit(1);
 208         }
 209
 210         dev = qdev_create(bus, name);
 211         qdev_set_nic_properties(dev, nd);
 212         qdev_init_nofail(dev);
 213     }
 214 }
 215
 216 void gtod_save(QEMUFile *f, void *opaque)
 217 {
 218     uint64_t tod_low;
 219     uint8_t tod_high;
 220     int r;
 221
 222     r = s390_get_clock(&tod_high, &tod_low);
 223     if (r) {
 224         fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
 225                         "Error code %d. Guest clock will not be migrated "
 226                         "which could cause the guest to hang.\n", r);
 227         qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
 228         return;
 229     }
 230
 231     qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
 232     qemu_put_byte(f, tod_high);
 233     qemu_put_be64(f, tod_low);
 234 }
 235
 236 int gtod_load(QEMUFile *f, void *opaque, int version_id)
 237 {
 238     uint64_t tod_low;
 239     uint8_t tod_high;
 240     int r;
 241
 242     if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
 243         fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
 244                         "cause the guest to hang.\n");
 245         return 0;
 246     }
 247
 248     tod_high = qemu_get_byte(f);
 249     tod_low = qemu_get_be64(f);
 250
 251     r = s390_set_clock(&tod_high, &tod_low);
 252     if (r) {
 253         fprintf(stderr, "WARNING: Unable to set guest clock value. "
 254                         "s390_get_clock returned error %d. This could cause "
 255                         "the guest to hang.\n", r);
 256     }
 257
 258     return 0;
 259 }
 260
 261 /* PC hardware initialisation */
 262 static void s390_init(MachineState *machine)
 263 {
 264     ram_addr_t my_ram_size;
 265     void *virtio_region;
 266     hwaddr virtio_region_len;
 267     hwaddr virtio_region_start;
 268
 269     if (machine->ram_slots) {
 270         error_report("Memory hotplug not supported by the selected machine.");
 271         exit(EXIT_FAILURE);
 272     }
 273     s390_sclp_init();
 274     my_ram_size = machine->ram_size;
 275
 276     /* get a BUS */
 277     s390_bus = s390_virtio_bus_init(&my_ram_size);
 278     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 279                       machine->initrd_filename, ZIPL_FILENAME, false);
 280     s390_flic_init();
 281
 282     /* register hypercalls */
 283     s390_virtio_register_hcalls();
 284
 285     /* allocate RAM */
 286     s390_memory_init(my_ram_size);
 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     /* init CPUs */
 298     s390_init_cpus(machine->cpu_model);
 299
 300     /* Create VirtIO network adapters */
 301     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 302
 303     /* Register savevm handler for guest TOD clock */
 304     register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
 305 }
 306
 307 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
 308 {
 309     CPUState *cs = qemu_get_cpu(cpu_index);
 310
 311     if (s390_cpu_restart(S390_CPU(cs))) {
 312         error_setg(errp, QERR_UNSUPPORTED);
 313     }
 314 }
 315
 316 static void s390_machine_class_init(ObjectClass *oc, void *data)
 317 {
 318     MachineClass *mc = MACHINE_CLASS(oc);
 319     NMIClass *nc = NMI_CLASS(oc);
 320
 321     mc->name = "s390-virtio";
 322     mc->alias = "s390";
 323     mc->desc = "VirtIO based S390 machine";
 324     mc->init = s390_init;
 325     mc->block_default_type = IF_VIRTIO;
 326     mc->max_cpus = 255;
 327     mc->no_serial = 1;
 328     mc->no_parallel = 1;
 329     mc->use_virtcon = 1;
 330     mc->no_floppy = 1;
 331     mc->no_cdrom = 1;
 332     mc->no_sdcard = 1;
 333     nc->nmi_monitor_handler = s390_nmi;
 334 }
 335
 336 static const TypeInfo s390_machine_info = {
 337     .name          = TYPE_S390_MACHINE,
 338     .parent        = TYPE_MACHINE,
 339     .class_init    = s390_machine_class_init,
 340     .interfaces = (InterfaceInfo[]) {
 341         { TYPE_NMI },
 342         { }
 343     },
 344 };
 345
 346 static void s390_machine_register_types(void)
 347 {
 348     type_register_static(&s390_machine_info);
 349 }
 350
 351 type_init(s390_machine_register_types)