hw/s390-virtio.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw.h"
  21 #include "block.h"
  22 #include "blockdev.h"
  23 #include "sysemu.h"
  24 #include "net.h"
  25 #include "boards.h"
  26 #include "monitor.h"
  27 #include "loader.h"
  28 #include "elf.h"
  29 #include "hw/virtio.h"
  30 #include "hw/sysbus.h"
  31 #include "kvm.h"
  32
  33 #include "hw/s390-virtio-bus.h"
  34
  35 //#define DEBUG_S390
  36
  37 #ifdef DEBUG_S390
  38 #define dprintf(fmt, ...) \
  39     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  40 #else
  41 #define dprintf(fmt, ...) \
  42     do { } while (0)
  43 #endif
  44
  45 #define KVM_S390_VIRTIO_NOTIFY          0
  46 #define KVM_S390_VIRTIO_RESET           1
  47 #define KVM_S390_VIRTIO_SET_STATUS      2
  48
  49 #define KERN_IMAGE_START                0x010000UL
  50 #define KERN_PARM_AREA                  0x010480UL
  51 #define INITRD_START                    0x800000UL
  52 #define INITRD_PARM_START               0x010408UL
  53 #define INITRD_PARM_SIZE                0x010410UL
  54 #define PARMFILE_START                  0x001000UL
  55
  56 #define ZIPL_START                      0x009000UL
  57 #define ZIPL_LOAD_ADDR                  0x009000UL
  58 #define ZIPL_FILENAME                   "s390-zipl.rom"
  59
  60 #define MAX_BLK_DEVS                    10
  61
  62 static VirtIOS390Bus *s390_bus;
  63 static CPUState **ipi_states;
  64
  65 void irq_info(Monitor *mon);
  66 void pic_info(Monitor *mon);
  67
  68 void irq_info(Monitor *mon)
  69 {
  70 }
  71
  72 void pic_info(Monitor *mon)
  73 {
  74 }
  75
  76 CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
  77 {
  78     if (cpu_addr >= smp_cpus) {
  79         return NULL;
  80     }
  81
  82     return ipi_states[cpu_addr];
  83 }
  84
  85 int s390_virtio_hypercall(CPUState *env, uint64_t mem, uint64_t hypercall)
  86 {
  87     int r = 0, i;
  88
  89     dprintf("KVM hypercall: %ld\n", hypercall);
  90     switch (hypercall) {
  91     case KVM_S390_VIRTIO_NOTIFY:
  92         if (mem > ram_size) {
  93             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  94                                                                mem, &i);
  95             if (dev) {
  96                 virtio_queue_notify(dev->vdev, i);
  97             } else {
  98                 r = -EINVAL;
  99             }
 100         } else {
 101             /* Early printk */
 102         }
 103         break;
 104     case KVM_S390_VIRTIO_RESET:
 105     {
 106         VirtIOS390Device *dev;
 107
 108         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 109         virtio_reset(dev->vdev);
 110         s390_virtio_device_sync(dev);
 111         break;
 112     }
 113     case KVM_S390_VIRTIO_SET_STATUS:
 114     {
 115         VirtIOS390Device *dev;
 116
 117         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 118         if (dev) {
 119             s390_virtio_device_update_status(dev);
 120         } else {
 121             r = -EINVAL;
 122         }
 123         break;
 124     }
 125     default:
 126         r = -EINVAL;
 127         break;
 128     }
 129
 130     return r;
 131 }
 132
 133 /* PC hardware initialisation */
 134 static void s390_init(ram_addr_t my_ram_size,
 135                       const char *boot_device,
 136                       const char *kernel_filename,
 137                       const char *kernel_cmdline,
 138                       const char *initrd_filename,
 139                       const char *cpu_model)
 140 {
 141     CPUState *env = NULL;
 142     ram_addr_t ram_addr;
 143     ram_addr_t kernel_size = 0;
 144     ram_addr_t initrd_offset;
 145     ram_addr_t initrd_size = 0;
 146     int shift = 0;
 147     uint8_t *storage_keys;
 148     int i;
 149
 150     /* s390x ram size detection needs a 16bit multiplier + an increment. So
 151        guests > 64GB can be specified in 2MB steps etc. */
 152     while ((my_ram_size >> (20 + shift)) > 65535) {
 153         shift++;
 154     }
 155     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 156
 157     /* lets propagate the changed ram size into the global variable. */
 158     ram_size = my_ram_size;
 159
 160     /* get a BUS */
 161     s390_bus = s390_virtio_bus_init(&my_ram_size);
 162
 163     /* allocate RAM */
 164     ram_addr = qemu_ram_alloc(NULL, "s390.ram", my_ram_size);
 165     cpu_register_physical_memory(0, my_ram_size, ram_addr);
 166
 167     /* allocate storage keys */
 168     storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
 169
 170     /* init CPUs */
 171     if (cpu_model == NULL) {
 172         cpu_model = "host";
 173     }
 174
 175     ipi_states = g_malloc(sizeof(CPUState *) * smp_cpus);
 176
 177     for (i = 0; i < smp_cpus; i++) {
 178         CPUState *tmp_env;
 179
 180         tmp_env = cpu_init(cpu_model);
 181         if (!env) {
 182             env = tmp_env;
 183         }
 184         ipi_states[i] = tmp_env;
 185         tmp_env->halted = 1;
 186         tmp_env->exception_index = EXCP_HLT;
 187         tmp_env->storage_keys = storage_keys;
 188     }
 189
 190     env->halted = 0;
 191     env->exception_index = 0;
 192
 193     if (kernel_filename) {
 194         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 195
 196         if (lduw_be_phys(KERN_IMAGE_START) != 0x0dd0) {
 197             fprintf(stderr, "Specified image is not an s390 boot image\n");
 198             exit(1);
 199         }
 200
 201         env->psw.addr = KERN_IMAGE_START;
 202         env->psw.mask = 0x0000000180000000ULL;
 203     } else {
 204         ram_addr_t bios_size = 0;
 205         char *bios_filename;
 206
 207         /* Load zipl bootloader */
 208         if (bios_name == NULL) {
 209             bios_name = ZIPL_FILENAME;
 210         }
 211
 212         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 213         bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));
 214         g_free(bios_filename);
 215
 216         if ((long)bios_size < 0) {
 217             hw_error("could not load bootloader '%s'\n", bios_name);
 218         }
 219
 220         if (bios_size > 4096) {
 221             hw_error("stage1 bootloader is > 4k\n");
 222         }
 223
 224         env->psw.addr = ZIPL_START;
 225         env->psw.mask = 0x0000000180000000ULL;
 226     }
 227
 228     if (initrd_filename) {
 229         initrd_offset = INITRD_START;
 230         while (kernel_size + 0x100000 > initrd_offset) {
 231             initrd_offset += 0x100000;
 232         }
 233         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 234
 235         stq_be_phys(INITRD_PARM_START, initrd_offset);
 236         stq_be_phys(INITRD_PARM_SIZE, initrd_size);
 237     }
 238
 239     if (kernel_cmdline) {
 240         cpu_physical_memory_write(KERN_PARM_AREA, kernel_cmdline,
 241                                   strlen(kernel_cmdline));
 242     }
 243
 244     /* Create VirtIO network adapters */
 245     for(i = 0; i < nb_nics; i++) {
 246         NICInfo *nd = &nd_table[i];
 247         DeviceState *dev;
 248
 249         if (!nd->model) {
 250             nd->model = g_strdup("virtio");
 251         }
 252
 253         if (strcmp(nd->model, "virtio")) {
 254             fprintf(stderr, "S390 only supports VirtIO nics\n");
 255             exit(1);
 256         }
 257
 258         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 259         qdev_set_nic_properties(dev, nd);
 260         qdev_init_nofail(dev);
 261     }
 262
 263     /* Create VirtIO disk drives */
 264     for(i = 0; i < MAX_BLK_DEVS; i++) {
 265         DriveInfo *dinfo;
 266         DeviceState *dev;
 267
 268         dinfo = drive_get(IF_IDE, 0, i);
 269         if (!dinfo) {
 270             continue;
 271         }
 272
 273         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 274         qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
 275         qdev_init_nofail(dev);
 276     }
 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     .no_serial = 1,
 285     .no_parallel = 1,
 286     .use_virtcon = 1,
 287     .no_vga = 1,
 288     .max_cpus = 255,
 289     .is_default = 1,
 290 };
 291
 292 static void s390_machine_init(void)
 293 {
 294     qemu_register_machine(&s390_machine);
 295 }
 296
 297 machine_init(s390_machine_init);