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                        bool enforce_bios)
 133 {
 134     DeviceState *dev;
 135
 136     dev  = qdev_create(NULL, "s390-ipl");
 137     if (kernel_filename) {
 138         qdev_prop_set_string(dev, "kernel", kernel_filename);
 139     }
 140     if (initrd_filename) {
 141         qdev_prop_set_string(dev, "initrd", initrd_filename);
 142     }
 143     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 144     qdev_prop_set_string(dev, "firmware", firmware);
 145     qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
 146     object_property_add_child(qdev_get_machine(), "s390-ipl",
 147                               OBJECT(dev), NULL);
 148     qdev_init_nofail(dev);
 149 }
 150
 151 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 152 {
 153     int i;
 154
 155     if (cpu_model == NULL) {
 156         cpu_model = "host";
 157     }
 158
 159     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 160
 161     for (i = 0; i < smp_cpus; i++) {
 162         S390CPU *cpu;
 163         CPUState *cs;
 164
 165         cpu = cpu_s390x_init(cpu_model);
 166         cs = CPU(cpu);
 167
 168         ipi_states[i] = cpu;
 169         cs->halted = 1;
 170         cs->exception_index = EXCP_HLT;
 171         cpu->env.storage_keys = storage_keys;
 172     }
 173 }
 174
 175
 176 void s390_create_virtio_net(BusState *bus, const char *name)
 177 {
 178     int i;
 179
 180     for (i = 0; i < nb_nics; i++) {
 181         NICInfo *nd = &nd_table[i];
 182         DeviceState *dev;
 183
 184         if (!nd->model) {
 185             nd->model = g_strdup("virtio");
 186         }
 187
 188         if (strcmp(nd->model, "virtio")) {
 189             fprintf(stderr, "S390 only supports VirtIO nics\n");
 190             exit(1);
 191         }
 192
 193         dev = qdev_create(bus, name);
 194         qdev_set_nic_properties(dev, nd);
 195         qdev_init_nofail(dev);
 196     }
 197 }
 198
 199 /* PC hardware initialisation */
 200 static void s390_init(MachineState *machine)
 201 {
 202     ram_addr_t my_ram_size = machine->ram_size;
 203     MemoryRegion *sysmem = get_system_memory();
 204     MemoryRegion *ram = g_new(MemoryRegion, 1);
 205     int increment_size = 20;
 206     uint8_t *storage_keys;
 207     void *virtio_region;
 208     hwaddr virtio_region_len;
 209     hwaddr virtio_region_start;
 210
 211     /*
 212      * The storage increment size is a multiple of 1M and is a power of 2.
 213      * The number of storage increments must be MAX_STORAGE_INCREMENTS or
 214      * fewer.
 215      */
 216     while ((my_ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
 217         increment_size++;
 218     }
 219     my_ram_size = my_ram_size >> increment_size << increment_size;
 220
 221     /* let's propagate the changed ram size into the global variable. */
 222     ram_size = my_ram_size;
 223
 224     /* get a BUS */
 225     s390_bus = s390_virtio_bus_init(&my_ram_size);
 226     s390_sclp_init();
 227     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
 228                       machine->initrd_filename, ZIPL_FILENAME, false);
 229     s390_flic_init();
 230
 231     /* register hypercalls */
 232     s390_virtio_register_hcalls();
 233
 234     /* allocate RAM */
 235     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
 236     vmstate_register_ram_global(ram);
 237     memory_region_add_subregion(sysmem, 0, ram);
 238
 239     /* clear virtio region */
 240     virtio_region_len = my_ram_size - ram_size;
 241     virtio_region_start = ram_size;
 242     virtio_region = cpu_physical_memory_map(virtio_region_start,
 243                                             &virtio_region_len, true);
 244     memset(virtio_region, 0, virtio_region_len);
 245     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 246                               virtio_region_len);
 247
 248     /* allocate storage keys */
 249     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 250
 251     /* init CPUs */
 252     s390_init_cpus(machine->cpu_model, storage_keys);
 253
 254     /* Create VirtIO network adapters */
 255     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 256 }
 257
 258 void s390_nmi(NMIState *n, int cpu_index, Error **errp)
 259 {
 260     CPUState *cs = qemu_get_cpu(cpu_index);
 261
 262     if (s390_cpu_restart(S390_CPU(cs))) {
 263         error_set(errp, QERR_UNSUPPORTED);
 264     }
 265 }
 266
 267 static void s390_machine_class_init(ObjectClass *oc, void *data)
 268 {
 269     MachineClass *mc = MACHINE_CLASS(oc);
 270     NMIClass *nc = NMI_CLASS(oc);
 271
 272     mc->name = "s390-virtio";
 273     mc->alias = "s390";
 274     mc->desc = "VirtIO based S390 machine";
 275     mc->init = s390_init;
 276     mc->block_default_type = IF_VIRTIO;
 277     mc->max_cpus = 255;
 278     mc->no_serial = 1;
 279     mc->no_parallel = 1;
 280     mc->use_virtcon = 1;
 281     mc->no_floppy = 1;
 282     mc->no_cdrom = 1;
 283     mc->no_sdcard = 1;
 284     mc->is_default = 1;
 285     nc->nmi_monitor_handler = s390_nmi;
 286 }
 287
 288 static const TypeInfo s390_machine_info = {
 289     .name          = TYPE_S390_MACHINE,
 290     .parent        = TYPE_MACHINE,
 291     .class_init    = s390_machine_class_init,
 292     .interfaces = (InterfaceInfo[]) {
 293         { TYPE_NMI },
 294         { }
 295     },
 296 };
 297
 298 static void s390_machine_register_types(void)
 299 {
 300     type_register_static(&s390_machine_info);
 301 }
 302
 303 type_init(s390_machine_register_types)