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 "block/block.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
  55 static VirtIOS390Bus *s390_bus;
  56 static S390CPU **ipi_states;
  57
  58 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  59 {
  60     if (cpu_addr >= smp_cpus) {
  61         return NULL;
  62     }
  63
  64     return ipi_states[cpu_addr];
  65 }
  66
  67 static int s390_virtio_hcall_notify(const uint64_t *args)
  68 {
  69     uint64_t mem = args[0];
  70     int r = 0, i;
  71
  72     if (mem > ram_size) {
  73         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  74         if (dev) {
  75             virtio_queue_notify(dev->vdev, i);
  76         } else {
  77             r = -EINVAL;
  78         }
  79     } else {
  80         /* Early printk */
  81     }
  82     return r;
  83 }
  84
  85 static int s390_virtio_hcall_reset(const uint64_t *args)
  86 {
  87     uint64_t mem = args[0];
  88     VirtIOS390Device *dev;
  89
  90     dev = s390_virtio_bus_find_mem(s390_bus, mem);
  91     if (dev == NULL) {
  92         return -EINVAL;
  93     }
  94     virtio_reset(dev->vdev);
  95     stb_phys(&address_space_memory, dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
  96     s390_virtio_device_sync(dev);
  97     s390_virtio_reset_idx(dev);
  98
  99     return 0;
 100 }
 101
 102 static int s390_virtio_hcall_set_status(const uint64_t *args)
 103 {
 104     uint64_t mem = args[0];
 105     int r = 0;
 106     VirtIOS390Device *dev;
 107
 108     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 109     if (dev) {
 110         s390_virtio_device_update_status(dev);
 111     } else {
 112         r = -EINVAL;
 113     }
 114     return r;
 115 }
 116
 117 static void s390_virtio_register_hcalls(void)
 118 {
 119     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 120                                    s390_virtio_hcall_notify);
 121     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 122                                    s390_virtio_hcall_reset);
 123     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 124                                    s390_virtio_hcall_set_status);
 125 }
 126
 127 /*
 128  * The number of running CPUs. On s390 a shutdown is the state of all CPUs
 129  * being either stopped or disabled (for interrupts) waiting. We have to
 130  * track this number to call the shutdown sequence accordingly. This
 131  * number is modified either on startup or while holding the big qemu lock.
 132  */
 133 static unsigned s390_running_cpus;
 134
 135 void s390_add_running_cpu(S390CPU *cpu)
 136 {
 137     CPUState *cs = CPU(cpu);
 138     CPUS390XState *env = &cpu->env;
 139
 140     if (cs->halted) {
 141         s390_running_cpus++;
 142         cs->halted = 0;
 143         env->exception_index = -1;
 144     }
 145 }
 146
 147 unsigned s390_del_running_cpu(S390CPU *cpu)
 148 {
 149     CPUState *cs = CPU(cpu);
 150     CPUS390XState *env = &cpu->env;
 151
 152     if (cs->halted == 0) {
 153         assert(s390_running_cpus >= 1);
 154         s390_running_cpus--;
 155         cs->halted = 1;
 156         env->exception_index = EXCP_HLT;
 157     }
 158     return s390_running_cpus;
 159 }
 160
 161 void s390_init_ipl_dev(const char *kernel_filename,
 162                        const char *kernel_cmdline,
 163                        const char *initrd_filename,
 164                        const char *firmware)
 165 {
 166     DeviceState *dev;
 167
 168     dev  = qdev_create(NULL, "s390-ipl");
 169     if (kernel_filename) {
 170         qdev_prop_set_string(dev, "kernel", kernel_filename);
 171     }
 172     if (initrd_filename) {
 173         qdev_prop_set_string(dev, "initrd", initrd_filename);
 174     }
 175     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 176     qdev_prop_set_string(dev, "firmware", firmware);
 177     qdev_init_nofail(dev);
 178 }
 179
 180 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 181 {
 182     int i;
 183
 184     if (cpu_model == NULL) {
 185         cpu_model = "host";
 186     }
 187
 188     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 189
 190     for (i = 0; i < smp_cpus; i++) {
 191         S390CPU *cpu;
 192         CPUState *cs;
 193
 194         cpu = cpu_s390x_init(cpu_model);
 195         cs = CPU(cpu);
 196
 197         ipi_states[i] = cpu;
 198         cs->halted = 1;
 199         cpu->env.exception_index = EXCP_HLT;
 200         cpu->env.storage_keys = storage_keys;
 201     }
 202 }
 203
 204
 205 void s390_create_virtio_net(BusState *bus, const char *name)
 206 {
 207     int i;
 208
 209     for (i = 0; i < nb_nics; i++) {
 210         NICInfo *nd = &nd_table[i];
 211         DeviceState *dev;
 212
 213         if (!nd->model) {
 214             nd->model = g_strdup("virtio");
 215         }
 216
 217         if (strcmp(nd->model, "virtio")) {
 218             fprintf(stderr, "S390 only supports VirtIO nics\n");
 219             exit(1);
 220         }
 221
 222         dev = qdev_create(bus, name);
 223         qdev_set_nic_properties(dev, nd);
 224         qdev_init_nofail(dev);
 225     }
 226 }
 227
 228 /* PC hardware initialisation */
 229 static void s390_init(QEMUMachineInitArgs *args)
 230 {
 231     ram_addr_t my_ram_size = args->ram_size;
 232     MemoryRegion *sysmem = get_system_memory();
 233     MemoryRegion *ram = g_new(MemoryRegion, 1);
 234     int shift = 0;
 235     uint8_t *storage_keys;
 236     void *virtio_region;
 237     hwaddr virtio_region_len;
 238     hwaddr virtio_region_start;
 239
 240     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 241        guests > 64GB can be specified in 2MB steps etc. */
 242     while ((my_ram_size >> (20 + shift)) > 65535) {
 243         shift++;
 244     }
 245     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 246
 247     /* let's propagate the changed ram size into the global variable. */
 248     ram_size = my_ram_size;
 249
 250     /* get a BUS */
 251     s390_bus = s390_virtio_bus_init(&my_ram_size);
 252     s390_sclp_init();
 253     s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,
 254                       args->initrd_filename, ZIPL_FILENAME);
 255     s390_flic_init();
 256
 257     /* register hypercalls */
 258     s390_virtio_register_hcalls();
 259
 260     /* allocate RAM */
 261     memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size);
 262     vmstate_register_ram_global(ram);
 263     memory_region_add_subregion(sysmem, 0, ram);
 264
 265     /* clear virtio region */
 266     virtio_region_len = my_ram_size - ram_size;
 267     virtio_region_start = ram_size;
 268     virtio_region = cpu_physical_memory_map(virtio_region_start,
 269                                             &virtio_region_len, true);
 270     memset(virtio_region, 0, virtio_region_len);
 271     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 272                               virtio_region_len);
 273
 274     /* allocate storage keys */
 275     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 276
 277     /* init CPUs */
 278     s390_init_cpus(args->cpu_model, storage_keys);
 279
 280     /* Create VirtIO network adapters */
 281     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 282 }
 283
 284 static QEMUMachine s390_machine = {
 285     .name = "s390-virtio",
 286     .alias = "s390",
 287     .desc = "VirtIO based S390 machine",
 288     .init = s390_init,
 289     .block_default_type = IF_VIRTIO,
 290     .no_cdrom = 1,
 291     .no_floppy = 1,
 292     .no_serial = 1,
 293     .no_parallel = 1,
 294     .no_sdcard = 1,
 295     .use_virtcon = 1,
 296     .max_cpus = 255,
 297     .is_default = 1,
 298 };
 299
 300 static void s390_machine_init(void)
 301 {
 302     qemu_register_machine(&s390_machine);
 303 }
 304
 305 machine_init(s390_machine_init);