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 S390_MACHINE                    "s390-virtio"
  58 #define TYPE_S390_MACHINE               MACHINE_TYPE_NAME(S390_MACHINE)
  59
  60 #define S390_TOD_CLOCK_VALUE_MISSING    0x00
  61 #define S390_TOD_CLOCK_VALUE_PRESENT    0x01
  62
  63 static VirtIOS390Bus *s390_bus;
  64 static S390CPU **ipi_states;
  65
  66 S390CPU *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 static int s390_virtio_hcall_notify(const uint64_t *args)
  76 {
  77     uint64_t mem = args[0];
  78     int r = 0, i;
  79
  80     if (mem > ram_size) {
  81         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  82         if (dev) {
  83             /*
  84              * Older kernels will use the virtqueue before setting DRIVER_OK.
  85              * In this case the feature bits are not yet up to date, meaning
  86              * that several funny things can happen, e.g. the guest thinks
  87              * EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
  88              * and status sync.
  89              */
  90             if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
  91                 s390_virtio_device_update_status(dev);
  92             }
  93             virtio_queue_notify(dev->vdev, i);
  94         } else {
  95             r = -EINVAL;
  96         }
  97     } else {
  98         /* Early printk */
  99     }
 100     return r;
 101 }
 102
 103 static int s390_virtio_hcall_reset(const uint64_t *args)
 104 {
 105     uint64_t mem = args[0];
 106     VirtIOS390Device *dev;
 107
 108     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 109     if (dev == NULL) {
 110         return -EINVAL;
 111     }
 112     virtio_reset(dev->vdev);
 113     address_space_stb(&address_space_memory,
 114                       dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0,
 115                       MEMTXATTRS_UNSPECIFIED, NULL);
 116     s390_virtio_device_sync(dev);
 117     s390_virtio_reset_idx(dev);
 118
 119     return 0;
 120 }
 121
 122 static int s390_virtio_hcall_set_status(const uint64_t *args)
 123 {
 124     uint64_t mem = args[0];
 125     int r = 0;
 126     VirtIOS390Device *dev;
 127
 128     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 129     if (dev) {
 130         s390_virtio_device_update_status(dev);
 131     } else {
 132         r = -EINVAL;
 133     }
 134     return r;
 135 }
 136
 137 static void s390_virtio_register_hcalls(void)
 138 {
 139     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 140                                    s390_virtio_hcall_notify);
 141     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 142                                    s390_virtio_hcall_reset);
 143     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 144                                    s390_virtio_hcall_set_status);
 145 }
 146
 147 void s390_init_ipl_dev(const char *kernel_filename,
 148                        const char *kernel_cmdline,
 149                        const char *initrd_filename,
 150                        const char *firmware,
 151                        bool enforce_bios)
 152 {
 153     DeviceState *dev;
 154
 155     dev  = qdev_create(NULL, "s390-ipl");
 156     if (kernel_filename) {
 157         qdev_prop_set_string(dev, "kernel", kernel_filename);
 158     }
 159     if (initrd_filename) {
 160         qdev_prop_set_string(dev, "initrd", initrd_filename);
 161     }
 162     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 163     qdev_prop_set_string(dev, "firmware", firmware);
 164     qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
 165     object_property_add_child(qdev_get_machine(), "s390-ipl",
 166                               OBJECT(dev), NULL);
 167     qdev_init_nofail(dev);
 168 }
 169
 170 void s390_init_cpus(const char *cpu_model)
 171 {
 172     int i;
 173
 174     if (cpu_model == NULL) {
 175         cpu_model = "host";
 176     }
 177
 178     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 179
 180     for (i = 0; i < smp_cpus; i++) {
 181         S390CPU *cpu;
 182         CPUState *cs;
 183
 184         cpu = cpu_s390x_init(cpu_model);
 185         cs = CPU(cpu);
 186
 187         ipi_states[i] = cpu;
 188         cs->halted = 1;
 189         cs->exception_index = EXCP_HLT;
 190     }
 191 }
 192
 193
 194 void s390_create_virtio_net(BusState *bus, const char *name)
 195 {
 196     int i;
 197
 198     for (i = 0; i < nb_nics; i++) {
 199         NICInfo *nd = &nd_table[i];
 200         DeviceState *dev;
 201
 202         if (!nd->model) {
 203             nd->model = g_strdup("virtio");
 204         }
 205
 206         if (strcmp(nd->model, "virtio")) {
 207             fprintf(stderr, "S390 only supports VirtIO nics\n");
 208             exit(1);
 209         }
 210
 211         dev = qdev_create(bus, name);
 212         qdev_set_nic_properties(dev, nd);
 213         qdev_init_nofail(dev);
 214     }
 215 }
 216
 217 void gtod_save(QEMUFile *f, void *opaque)
 218 {
 219     uint64_t tod_low;
 220     uint8_t tod_high;
 221     int r;
 222
 223     r = s390_get_clock(&tod_high, &tod_low);
 224     if (r) {
 225         fprintf(stderr, "WARNING: Unable to get guest clock for migration. "
 226                         "Error code %d. Guest clock will not be migrated "
 227                         "which could cause the guest to hang.\n", r);
 228         qemu_put_byte(f, S390_TOD_CLOCK_VALUE_MISSING);
 229         return;
 230     }
 231
 232     qemu_put_byte(f, S390_TOD_CLOCK_VALUE_PRESENT);
 233     qemu_put_byte(f, tod_high);
 234     qemu_put_be64(f, tod_low);
 235 }
 236
 237 int gtod_load(QEMUFile *f, void *opaque, int version_id)
 238 {
 239     uint64_t tod_low;
 240     uint8_t tod_high;
 241     int r;
 242
 243     if (qemu_get_byte(f) == S390_TOD_CLOCK_VALUE_MISSING) {
 244         fprintf(stderr, "WARNING: Guest clock was not migrated. This could "
 245                         "cause the guest to hang.\n");
 246         return 0;
 247     }
 248
 249     tod_high = qemu_get_byte(f);
 250     tod_low = qemu_get_be64(f);
 251
 252     r = s390_set_clock(&tod_high, &tod_low);
 253     if (r) {
 254         fprintf(stderr, "WARNING: Unable to set guest clock value. "
 255                         "s390_get_clock returned error %d. This could cause "
 256                         "the guest to hang.\n", r);
 257     }
 258
 259     return 0;
 260 }
 261
 262 /* PC hardware initialisation */
 263 static void s390_init(MachineState *machine)
 264 {
 265     ram_addr_t my_ram_size;
 266     void *virtio_region;
 267     hwaddr virtio_region_len;
 268     hwaddr virtio_region_start;
 269
 270     if (machine->ram_slots) {
 271         error_report("Memory hotplug not supported by the selected machine.");
 272         exit(EXIT_FAILURE);
 273     }
 274     s390_sclp_init();
 275     my_ram_size = machine->ram_size;
 276
 277     /* get a BUS */
 278     s390_bus = s390_virtio_bus_init(&my_ram_size);
 279     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 280                       machine->initrd_filename, ZIPL_FILENAME, false);
 281     s390_flic_init();
 282
 283     /* register hypercalls */
 284     s390_virtio_register_hcalls();
 285
 286     /* allocate RAM */
 287     s390_memory_init(my_ram_size);
 288
 289     /* clear virtio region */
 290     virtio_region_len = my_ram_size - ram_size;
 291     virtio_region_start = ram_size;
 292     virtio_region = cpu_physical_memory_map(virtio_region_start,
 293                                             &virtio_region_len, true);
 294     memset(virtio_region, 0, virtio_region_len);
 295     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 296                               virtio_region_len);
 297
 298     /* init CPUs */
 299     s390_init_cpus(machine->cpu_model);
 300
 301     /* Create VirtIO network adapters */
 302     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 303
 304     /* Register savevm handler for guest TOD clock */
 305     register_savevm(NULL, "todclock", 0, 1, gtod_save, gtod_load, NULL);
 306 }
 307
 308 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
 309 {
 310     CPUState *cs = qemu_get_cpu(cpu_index);
 311
 312     if (s390_cpu_restart(S390_CPU(cs))) {
 313         error_setg(errp, QERR_UNSUPPORTED);
 314     }
 315 }
 316
 317 static void s390_machine_class_init(ObjectClass *oc, void *data)
 318 {
 319     MachineClass *mc = MACHINE_CLASS(oc);
 320     NMIClass *nc = NMI_CLASS(oc);
 321
 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)