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.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-virtio.h"
  40
  41 //#define DEBUG_S390
  42
  43 #ifdef DEBUG_S390
  44 #define dprintf(fmt, ...) \
  45     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  46 #else
  47 #define dprintf(fmt, ...) \
  48     do { } while (0)
  49 #endif
  50
  51 #define MAX_BLK_DEVS                    10
  52
  53 static VirtIOS390Bus *s390_bus;
  54 static S390CPU **ipi_states;
  55
  56 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
  57 {
  58     if (cpu_addr >= smp_cpus) {
  59         return NULL;
  60     }
  61
  62     return ipi_states[cpu_addr];
  63 }
  64
  65 static int s390_virtio_hcall_notify(const uint64_t *args)
  66 {
  67     uint64_t mem = args[0];
  68     int r = 0, i;
  69
  70     if (mem > ram_size) {
  71         VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
  72         if (dev) {
  73             virtio_queue_notify(dev->vdev, i);
  74         } else {
  75             r = -EINVAL;
  76         }
  77     } else {
  78         /* Early printk */
  79     }
  80     return r;
  81 }
  82
  83 static int s390_virtio_hcall_reset(const uint64_t *args)
  84 {
  85     uint64_t mem = args[0];
  86     VirtIOS390Device *dev;
  87
  88     dev = s390_virtio_bus_find_mem(s390_bus, mem);
  89     if (dev == NULL) {
  90         return -EINVAL;
  91     }
  92     virtio_reset(dev->vdev);
  93     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
  94     s390_virtio_device_sync(dev);
  95     s390_virtio_reset_idx(dev);
  96
  97     return 0;
  98 }
  99
 100 static int s390_virtio_hcall_set_status(const uint64_t *args)
 101 {
 102     uint64_t mem = args[0];
 103     int r = 0;
 104     VirtIOS390Device *dev;
 105
 106     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 107     if (dev) {
 108         s390_virtio_device_update_status(dev);
 109     } else {
 110         r = -EINVAL;
 111     }
 112     return r;
 113 }
 114
 115 static void s390_virtio_register_hcalls(void)
 116 {
 117     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 118                                    s390_virtio_hcall_notify);
 119     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 120                                    s390_virtio_hcall_reset);
 121     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 122                                    s390_virtio_hcall_set_status);
 123 }
 124
 125 /*
 126  * The number of running CPUs. On s390 a shutdown is the state of all CPUs
 127  * being either stopped or disabled (for interrupts) waiting. We have to
 128  * track this number to call the shutdown sequence accordingly. This
 129  * number is modified either on startup or while holding the big qemu lock.
 130  */
 131 static unsigned s390_running_cpus;
 132
 133 void s390_add_running_cpu(S390CPU *cpu)
 134 {
 135     CPUState *cs = CPU(cpu);
 136     CPUS390XState *env = &cpu->env;
 137
 138     if (cs->halted) {
 139         s390_running_cpus++;
 140         cs->halted = 0;
 141         env->exception_index = -1;
 142     }
 143 }
 144
 145 unsigned s390_del_running_cpu(S390CPU *cpu)
 146 {
 147     CPUState *cs = CPU(cpu);
 148     CPUS390XState *env = &cpu->env;
 149
 150     if (cs->halted == 0) {
 151         assert(s390_running_cpus >= 1);
 152         s390_running_cpus--;
 153         cs->halted = 1;
 154         env->exception_index = EXCP_HLT;
 155     }
 156     return s390_running_cpus;
 157 }
 158
 159 void s390_init_ipl_dev(const char *kernel_filename,
 160                        const char *kernel_cmdline,
 161                        const char *initrd_filename)
 162 {
 163     DeviceState *dev;
 164
 165     dev  = qdev_create(NULL, "s390-ipl");
 166     if (kernel_filename) {
 167         qdev_prop_set_string(dev, "kernel", kernel_filename);
 168     }
 169     if (initrd_filename) {
 170         qdev_prop_set_string(dev, "initrd", initrd_filename);
 171     }
 172     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 173     qdev_init_nofail(dev);
 174 }
 175
 176 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 177 {
 178     int i;
 179
 180     if (cpu_model == NULL) {
 181         cpu_model = "host";
 182     }
 183
 184     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 185
 186     for (i = 0; i < smp_cpus; i++) {
 187         S390CPU *cpu;
 188         CPUState *cs;
 189
 190         cpu = cpu_s390x_init(cpu_model);
 191         cs = CPU(cpu);
 192
 193         ipi_states[i] = cpu;
 194         cs->halted = 1;
 195         cpu->env.exception_index = EXCP_HLT;
 196         cpu->env.storage_keys = storage_keys;
 197     }
 198 }
 199
 200
 201 void s390_create_virtio_net(BusState *bus, const char *name)
 202 {
 203     int i;
 204
 205     for (i = 0; i < nb_nics; i++) {
 206         NICInfo *nd = &nd_table[i];
 207         DeviceState *dev;
 208
 209         if (!nd->model) {
 210             nd->model = g_strdup("virtio");
 211         }
 212
 213         if (strcmp(nd->model, "virtio")) {
 214             fprintf(stderr, "S390 only supports VirtIO nics\n");
 215             exit(1);
 216         }
 217
 218         dev = qdev_create(bus, name);
 219         qdev_set_nic_properties(dev, nd);
 220         qdev_init_nofail(dev);
 221     }
 222 }
 223
 224 /* PC hardware initialisation */
 225 static void s390_init(QEMUMachineInitArgs *args)
 226 {
 227     ram_addr_t my_ram_size = args->ram_size;
 228     MemoryRegion *sysmem = get_system_memory();
 229     MemoryRegion *ram = g_new(MemoryRegion, 1);
 230     int shift = 0;
 231     uint8_t *storage_keys;
 232     void *virtio_region;
 233     hwaddr virtio_region_len;
 234     hwaddr virtio_region_start;
 235
 236     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 237        guests > 64GB can be specified in 2MB steps etc. */
 238     while ((my_ram_size >> (20 + shift)) > 65535) {
 239         shift++;
 240     }
 241     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 242
 243     /* lets propagate the changed ram size into the global variable. */
 244     ram_size = my_ram_size;
 245
 246     /* get a BUS */
 247     s390_bus = s390_virtio_bus_init(&my_ram_size);
 248     s390_sclp_init();
 249     s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,
 250                       args->initrd_filename);
 251
 252     /* register hypercalls */
 253     s390_virtio_register_hcalls();
 254
 255     /* allocate RAM */
 256     memory_region_init_ram(ram, "s390.ram", my_ram_size);
 257     vmstate_register_ram_global(ram);
 258     memory_region_add_subregion(sysmem, 0, ram);
 259
 260     /* clear virtio region */
 261     virtio_region_len = my_ram_size - ram_size;
 262     virtio_region_start = ram_size;
 263     virtio_region = cpu_physical_memory_map(virtio_region_start,
 264                                             &virtio_region_len, true);
 265     memset(virtio_region, 0, virtio_region_len);
 266     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 267                               virtio_region_len);
 268
 269     /* allocate storage keys */
 270     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 271
 272     /* init CPUs */
 273     s390_init_cpus(args->cpu_model, storage_keys);
 274
 275     /* Create VirtIO network adapters */
 276     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 277 }
 278
 279 static QEMUMachine s390_machine = {
 280     .name = "s390-virtio",
 281     .alias = "s390",
 282     .desc = "VirtIO based S390 machine",
 283     .init = s390_init,
 284     .block_default_type = IF_VIRTIO,
 285     .no_cdrom = 1,
 286     .no_floppy = 1,
 287     .no_serial = 1,
 288     .no_parallel = 1,
 289     .no_sdcard = 1,
 290     .use_virtcon = 1,
 291     .max_cpus = 255,
 292     .is_default = 1,
 293     DEFAULT_MACHINE_OPTIONS,
 294 };
 295
 296 static void s390_machine_init(void)
 297 {
 298     qemu_register_machine(&s390_machine);
 299 }
 300
 301 machine_init(s390_machine_init);