hw/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.h"
  25 #include "block/block.h"
  26 #include "sysemu/blockdev.h"
  27 #include "sysemu/sysemu.h"
  28 #include "net/net.h"
  29 #include "boards.h"
  30 #include "monitor/monitor.h"
  31 #include "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/s390-virtio-bus.h"
  38 #include "hw/s390x/sclp.h"
  39 #include "hw/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     virtio_reset(dev->vdev);
  90     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0);
  91     s390_virtio_device_sync(dev);
  92     s390_virtio_reset_idx(dev);
  93
  94     return 0;
  95 }
  96
  97 static int s390_virtio_hcall_set_status(const uint64_t *args)
  98 {
  99     uint64_t mem = args[0];
 100     int r = 0;
 101     VirtIOS390Device *dev;
 102
 103     dev = s390_virtio_bus_find_mem(s390_bus, mem);
 104     if (dev) {
 105         s390_virtio_device_update_status(dev);
 106     } else {
 107         r = -EINVAL;
 108     }
 109     return r;
 110 }
 111
 112 static void s390_virtio_register_hcalls(void)
 113 {
 114     s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY,
 115                                    s390_virtio_hcall_notify);
 116     s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET,
 117                                    s390_virtio_hcall_reset);
 118     s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS,
 119                                    s390_virtio_hcall_set_status);
 120 }
 121
 122 /*
 123  * The number of running CPUs. On s390 a shutdown is the state of all CPUs
 124  * being either stopped or disabled (for interrupts) waiting. We have to
 125  * track this number to call the shutdown sequence accordingly. This
 126  * number is modified either on startup or while holding the big qemu lock.
 127  */
 128 static unsigned s390_running_cpus;
 129
 130 void s390_add_running_cpu(CPUS390XState *env)
 131 {
 132     if (env->halted) {
 133         s390_running_cpus++;
 134         env->halted = 0;
 135         env->exception_index = -1;
 136     }
 137 }
 138
 139 unsigned s390_del_running_cpu(CPUS390XState *env)
 140 {
 141     if (env->halted == 0) {
 142         assert(s390_running_cpus >= 1);
 143         s390_running_cpus--;
 144         env->halted = 1;
 145         env->exception_index = EXCP_HLT;
 146     }
 147     return s390_running_cpus;
 148 }
 149
 150 /* PC hardware initialisation */
 151 static void s390_init(QEMUMachineInitArgs *args)
 152 {
 153     ram_addr_t my_ram_size = args->ram_size;
 154     const char *cpu_model = args->cpu_model;
 155     CPUS390XState *env = NULL;
 156     DeviceState *dev;
 157     MemoryRegion *sysmem = get_system_memory();
 158     MemoryRegion *ram = g_new(MemoryRegion, 1);
 159     int shift = 0;
 160     uint8_t *storage_keys;
 161     void *virtio_region;
 162     hwaddr virtio_region_len;
 163     hwaddr virtio_region_start;
 164     int i;
 165
 166     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 167        guests > 64GB can be specified in 2MB steps etc. */
 168     while ((my_ram_size >> (20 + shift)) > 65535) {
 169         shift++;
 170     }
 171     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 172
 173     /* lets propagate the changed ram size into the global variable. */
 174     ram_size = my_ram_size;
 175
 176     /* get a BUS */
 177     s390_bus = s390_virtio_bus_init(&my_ram_size);
 178     s390_sclp_init();
 179     dev  = qdev_create(NULL, "s390-ipl");
 180     if (args->kernel_filename) {
 181         qdev_prop_set_string(dev, "kernel", args->kernel_filename);
 182     }
 183     if (args->initrd_filename) {
 184         qdev_prop_set_string(dev, "initrd", args->initrd_filename);
 185     }
 186     qdev_prop_set_string(dev, "cmdline", args->kernel_cmdline);
 187     qdev_init_nofail(dev);
 188
 189     /* register hypercalls */
 190     s390_virtio_register_hcalls();
 191
 192     /* allocate RAM */
 193     memory_region_init_ram(ram, "s390.ram", my_ram_size);
 194     vmstate_register_ram_global(ram);
 195     memory_region_add_subregion(sysmem, 0, ram);
 196
 197     /* clear virtio region */
 198     virtio_region_len = my_ram_size - ram_size;
 199     virtio_region_start = ram_size;
 200     virtio_region = cpu_physical_memory_map(virtio_region_start,
 201                                             &virtio_region_len, true);
 202     memset(virtio_region, 0, virtio_region_len);
 203     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
 204                               virtio_region_len);
 205
 206     /* allocate storage keys */
 207     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 208
 209     /* init CPUs */
 210     if (cpu_model == NULL) {
 211         cpu_model = "host";
 212     }
 213
 214     ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus);
 215
 216     for (i = 0; i < smp_cpus; i++) {
 217         S390CPU *cpu;
 218         CPUS390XState *tmp_env;
 219
 220         cpu = cpu_s390x_init(cpu_model);
 221         tmp_env = &cpu->env;
 222         if (!env) {
 223             env = tmp_env;
 224         }
 225         ipi_states[i] = cpu;
 226         tmp_env->halted = 1;
 227         tmp_env->exception_index = EXCP_HLT;
 228         tmp_env->storage_keys = storage_keys;
 229     }
 230
 231
 232     /* Create VirtIO network adapters */
 233     for(i = 0; i < nb_nics; i++) {
 234         NICInfo *nd = &nd_table[i];
 235         DeviceState *dev;
 236
 237         if (!nd->model) {
 238             nd->model = g_strdup("virtio");
 239         }
 240
 241         if (strcmp(nd->model, "virtio")) {
 242             fprintf(stderr, "S390 only supports VirtIO nics\n");
 243             exit(1);
 244         }
 245
 246         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 247         qdev_set_nic_properties(dev, nd);
 248         qdev_init_nofail(dev);
 249     }
 250 }
 251
 252 static QEMUMachine s390_machine = {
 253     .name = "s390-virtio",
 254     .alias = "s390",
 255     .desc = "VirtIO based S390 machine",
 256     .init = s390_init,
 257     .block_default_type = IF_VIRTIO,
 258     .no_cdrom = 1,
 259     .no_floppy = 1,
 260     .no_serial = 1,
 261     .no_parallel = 1,
 262     .no_sdcard = 1,
 263     .use_virtcon = 1,
 264     .max_cpus = 255,
 265     .is_default = 1,
 266     DEFAULT_MACHINE_OPTIONS,
 267 };
 268
 269 static void s390_machine_init(void)
 270 {
 271     qemu_register_machine(&s390_machine);
 272 }
 273
 274 machine_init(s390_machine_init);