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
  42 //#define DEBUG_S390
  43
  44 #ifdef DEBUG_S390
  45 #define DPRINTF(fmt, ...) \
  46     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  47 #else
  48 #define DPRINTF(fmt, ...) \
  49     do { } while (0)
  50 #endif
  51
  52 #define MAX_BLK_DEVS                    10
  53 #define ZIPL_FILENAME                   "s390-zipl.rom"
  54 #define TYPE_S390_MACHINE               "s390-machine"
  55
  56 static VirtIOS390Bus *s390_bus;
  57 static S390CPU **ipi_states;
  58
  59 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  60 {
  61     if (cpu_addr >= smp_cpus) {
  62         return NULL;
  63     }
  64
  65     return ipi_states[cpu_addr];
  66 }
  67
  68 static int s390_virtio_hcall_notify(const uint64_t *args)
  69 {
  70     uint64_t mem = args[0];
  71     int r = 0, i;
  72
  73     if (mem > ram_size) {
  74         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  75         if (dev) {
  76             virtio_queue_notify(dev->vdev, i);
  77         } else {
  78             r = -EINVAL;
  79         }
  80     } else {
  81         /* Early printk */
  82     }
  83     return r;
  84 }
  85
  86 static int s390_virtio_hcall_reset(const uint64_t *args)
  87 {
  88     uint64_t mem = args[0];
  89     VirtIOS390Device *dev;
  90
  91     dev = s390_virtio_bus_find_mem(s390_bus, mem);
  92     if (dev == NULL) {
  93         return -EINVAL;
  94     }
  95     virtio_reset(dev->vdev);
  96     stb_phys(&address_space_memory, dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
  97     s390_virtio_device_sync(dev);
  98     s390_virtio_reset_idx(dev);
  99
 100     return 0;
 101 }
 102
 103 static int s390_virtio_hcall_set_status(const uint64_t *args)
 104 {
 105     uint64_t mem = args[0];
 106     int r = 0;
 107     VirtIOS390Device *dev;
 108
 109     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 110     if (dev) {
 111         s390_virtio_device_update_status(dev);
 112     } else {
 113         r = -EINVAL;
 114     }
 115     return r;
 116 }
 117
 118 static void s390_virtio_register_hcalls(void)
 119 {
 120     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 121                                    s390_virtio_hcall_notify);
 122     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 123                                    s390_virtio_hcall_reset);
 124     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 125                                    s390_virtio_hcall_set_status);
 126 }
 127
 128 void s390_init_ipl_dev(const char *kernel_filename,
 129                        const char *kernel_cmdline,
 130                        const char *initrd_filename,
 131                        const char *firmware)
 132 {
 133     DeviceState *dev;
 134
 135     dev  = qdev_create(NULL, "s390-ipl");
 136     if (kernel_filename) {
 137         qdev_prop_set_string(dev, "kernel", kernel_filename);
 138     }
 139     if (initrd_filename) {
 140         qdev_prop_set_string(dev, "initrd", initrd_filename);
 141     }
 142     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 143     qdev_prop_set_string(dev, "firmware", firmware);
 144     qdev_init_nofail(dev);
 145 }
 146
 147 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 148 {
 149     int i;
 150
 151     if (cpu_model == NULL) {
 152         cpu_model = "host";
 153     }
 154
 155     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 156
 157     for (i = 0; i < smp_cpus; i++) {
 158         S390CPU *cpu;
 159         CPUState *cs;
 160
 161         cpu = cpu_s390x_init(cpu_model);
 162         cs = CPU(cpu);
 163
 164         ipi_states[i] = cpu;
 165         cs->halted = 1;
 166         cs->exception_index = EXCP_HLT;
 167         cpu->env.storage_keys = storage_keys;
 168     }
 169 }
 170
 171
 172 void s390_create_virtio_net(BusState *bus, const char *name)
 173 {
 174     int i;
 175
 176     for (i = 0; i < nb_nics; i++) {
 177         NICInfo *nd = &nd_table[i];
 178         DeviceState *dev;
 179
 180         if (!nd->model) {
 181             nd->model = g_strdup("virtio");
 182         }
 183
 184         if (strcmp(nd->model, "virtio")) {
 185             fprintf(stderr, "S390 only supports VirtIO nics\n");
 186             exit(1);
 187         }
 188
 189         dev = qdev_create(bus, name);
 190         qdev_set_nic_properties(dev, nd);
 191         qdev_init_nofail(dev);
 192     }
 193 }
 194
 195 /* PC hardware initialisation */
 196 static void s390_init(MachineState *machine)
 197 {
 198     ram_addr_t my_ram_size = machine->ram_size;
 199     MemoryRegion *sysmem = get_system_memory();
 200     MemoryRegion *ram = g_new(MemoryRegion, 1);
 201     int increment_size = 20;
 202     uint8_t *storage_keys;
 203     void *virtio_region;
 204     hwaddr virtio_region_len;
 205     hwaddr virtio_region_start;
 206
 207     /*
 208      * The storage increment size is a multiple of 1M and is a power of 2.
 209      * The number of storage increments must be MAX_STORAGE_INCREMENTS or
 210      * fewer.
 211      */
 212     while ((my_ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
 213         increment_size++;
 214     }
 215     my_ram_size = my_ram_size >> increment_size << increment_size;
 216
 217     /* let's propagate the changed ram size into the global variable. */
 218     ram_size = my_ram_size;
 219
 220     /* get a BUS */
 221     s390_bus = s390_virtio_bus_init(&my_ram_size);
 222     s390_sclp_init();
 223     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 224                       machine->initrd_filename, ZIPL_FILENAME);
 225     s390_flic_init();
 226
 227     /* register hypercalls */
 228     s390_virtio_register_hcalls();
 229
 230     /* allocate RAM */
 231     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
 232     vmstate_register_ram_global(ram);
 233     memory_region_add_subregion(sysmem, 0, ram);
 234
 235     /* clear virtio region */
 236     virtio_region_len = my_ram_size - ram_size;
 237     virtio_region_start = ram_size;
 238     virtio_region = cpu_physical_memory_map(virtio_region_start,
 239                                             &virtio_region_len, true);
 240     memset(virtio_region, 0, virtio_region_len);
 241     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 242                               virtio_region_len);
 243
 244     /* allocate storage keys */
 245     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 246
 247     /* init CPUs */
 248     s390_init_cpus(machine->cpu_model, storage_keys);
 249
 250     /* Create VirtIO network adapters */
 251     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 252 }
 253
 254 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
 255 {
 256     CPUState *cs = qemu_get_cpu(cpu_index);
 257
 258     if (s390_cpu_restart(S390_CPU(cs))) {
 259         error_set(errp, QERR_UNSUPPORTED);
 260     }
 261 }
 262
 263 static void s390_machine_class_init(ObjectClass *oc, void *data)
 264 {
 265     MachineClass *mc = MACHINE_CLASS(oc);
 266     NMIClass *nc = NMI_CLASS(oc);
 267
 268     mc->name = "s390-virtio";
 269     mc->alias = "s390";
 270     mc->desc = "VirtIO based S390 machine";
 271     mc->init = s390_init;
 272     mc->block_default_type = IF_VIRTIO;
 273     mc->max_cpus = 255;
 274     mc->no_serial = 1;
 275     mc->no_parallel = 1;
 276     mc->use_virtcon = 1;
 277     mc->no_floppy = 1;
 278     mc->no_cdrom = 1;
 279     mc->no_sdcard = 1;
 280     mc->is_default = 1;
 281     nc->nmi_monitor_handler = s390_nmi;
 282 }
 283
 284 static const TypeInfo s390_machine_info = {
 285     .name          = TYPE_S390_MACHINE,
 286     .parent        = TYPE_MACHINE,
 287     .class_init    = s390_machine_class_init,
 288     .interfaces = (InterfaceInfo[]) {
 289         { TYPE_NMI },
 290         { }
 291     },
 292 };
 293
 294 static void s390_machine_register_types(void)
 295 {
 296     type_register_static(&s390_machine_info);
 297 }
 298
 299 type_init(s390_machine_register_types)