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(CPUS390XState *env)
 134 {
 135     if (env->halted) {
 136         s390_running_cpus++;
 137         env->halted = 0;
 138         env->exception_index = -1;
 139     }
 140 }
 141
 142 unsigned s390_del_running_cpu(CPUS390XState *env)
 143 {
 144     if (env->halted == 0) {
 145         assert(s390_running_cpus >= 1);
 146         s390_running_cpus--;
 147         env->halted = 1;
 148         env->exception_index = EXCP_HLT;
 149     }
 150     return s390_running_cpus;
 151 }
 152
 153 void s390_init_ipl_dev(const char *kernel_filename,
 154                        const char *kernel_cmdline,
 155                        const char *initrd_filename)
 156 {
 157     DeviceState *dev;
 158
 159     dev  = qdev_create(NULL, "s390-ipl");
 160     if (kernel_filename) {
 161         qdev_prop_set_string(dev, "kernel", kernel_filename);
 162     }
 163     if (initrd_filename) {
 164         qdev_prop_set_string(dev, "initrd", initrd_filename);
 165     }
 166     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
 167     qdev_init_nofail(dev);
 168 }
 169
 170 void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
 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
 183         cpu = cpu_s390x_init(cpu_model);
 184
 185         ipi_states[i] = cpu;
 186         cpu->env.halted = 1;
 187         cpu->env.exception_index = EXCP_HLT;
 188         cpu->env.storage_keys = storage_keys;
 189     }
 190 }
 191
 192
 193 void s390_create_virtio_net(BusState *bus, const char *name)
 194 {
 195     int i;
 196
 197     for (i = 0; i < nb_nics; i++) {
 198         NICInfo *nd = &nd_table[i];
 199         DeviceState *dev;
 200
 201         if (!nd->model) {
 202             nd->model = g_strdup("virtio");
 203         }
 204
 205         if (strcmp(nd->model, "virtio")) {
 206             fprintf(stderr, "S390 only supports VirtIO nics\n");
 207             exit(1);
 208         }
 209
 210         dev = qdev_create(bus, name);
 211         qdev_set_nic_properties(dev, nd);
 212         qdev_init_nofail(dev);
 213     }
 214 }
 215
 216 /* PC hardware initialisation */
 217 static void s390_init(QEMUMachineInitArgs *args)
 218 {
 219     ram_addr_t my_ram_size = args->ram_size;
 220     MemoryRegion *sysmem = get_system_memory();
 221     MemoryRegion *ram = g_new(MemoryRegion, 1);
 222     int shift = 0;
 223     uint8_t *storage_keys;
 224     void *virtio_region;
 225     hwaddr virtio_region_len;
 226     hwaddr virtio_region_start;
 227
 228     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 229        guests > 64GB can be specified in 2MB steps etc. */
 230     while ((my_ram_size >> (20 + shift)) > 65535) {
 231         shift++;
 232     }
 233     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 234
 235     /* lets propagate the changed ram size into the global variable. */
 236     ram_size = my_ram_size;
 237
 238     /* get a BUS */
 239     s390_bus = s390_virtio_bus_init(&my_ram_size);
 240     s390_sclp_init();
 241     s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline,
 242                       args->initrd_filename);
 243
 244     /* register hypercalls */
 245     s390_virtio_register_hcalls();
 246
 247     /* allocate RAM */
 248     memory_region_init_ram(ram, "s390.ram", my_ram_size);
 249     vmstate_register_ram_global(ram);
 250     memory_region_add_subregion(sysmem, 0, ram);
 251
 252     /* clear virtio region */
 253     virtio_region_len = my_ram_size - ram_size;
 254     virtio_region_start = ram_size;
 255     virtio_region = cpu_physical_memory_map(virtio_region_start,
 256                                             &virtio_region_len, true);
 257     memset(virtio_region, 0, virtio_region_len);
 258     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 259                               virtio_region_len);
 260
 261     /* allocate storage keys */
 262     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 263
 264     /* init CPUs */
 265     s390_init_cpus(args->cpu_model, storage_keys);
 266
 267     /* Create VirtIO network adapters */
 268     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
 269 }
 270
 271 static QEMUMachine s390_machine = {
 272     .name = "s390-virtio",
 273     .alias = "s390",
 274     .desc = "VirtIO based S390 machine",
 275     .init = s390_init,
 276     .block_default_type = IF_VIRTIO,
 277     .no_cdrom = 1,
 278     .no_floppy = 1,
 279     .no_serial = 1,
 280     .no_parallel = 1,
 281     .no_sdcard = 1,
 282     .use_virtcon = 1,
 283     .max_cpus = 255,
 284     .is_default = 1,
 285     DEFAULT_MACHINE_OPTIONS,
 286 };
 287
 288 static void s390_machine_init(void)
 289 {
 290     qemu_register_machine(&s390_machine);
 291 }
 292
 293 machine_init(s390_machine_init);