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)
  86 {
  87     int r = 0, i;
  88     target_ulong mem = env->regs[2];
  89
  90     dprintf("KVM hypercall: %ld\n", env->regs[1]);
  91     switch (env->regs[1]) {
  92     case KVM_S390_VIRTIO_NOTIFY:
  93         if (mem > ram_size) {
  94             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  95                                                                mem, &i);
  96             if (dev) {
  97                 virtio_queue_notify(dev->vdev, i);
  98             } else {
  99                 r = -EINVAL;
 100             }
 101         } else {
 102             /* Early printk */
 103         }
 104         break;
 105     case KVM_S390_VIRTIO_RESET:
 106     {
 107         VirtIOS390Device *dev;
 108
 109         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 110         virtio_reset(dev->vdev);
 111         s390_virtio_device_sync(dev);
 112         break;
 113     }
 114     case KVM_S390_VIRTIO_SET_STATUS:
 115     {
 116         VirtIOS390Device *dev;
 117
 118         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 119         if (dev) {
 120             s390_virtio_device_update_status(dev);
 121         } else {
 122             r = -EINVAL;
 123         }
 124         break;
 125     }
 126     default:
 127         r = -EINVAL;
 128         break;
 129     }
 130
 131     env->regs[2] = r;
 132     return 0;
 133 }
 134
 135 /* PC hardware initialisation */
 136 static void s390_init(ram_addr_t ram_size,
 137                       const char *boot_device,
 138                       const char *kernel_filename,
 139                       const char *kernel_cmdline,
 140                       const char *initrd_filename,
 141                       const char *cpu_model)
 142 {
 143     CPUState *env = NULL;
 144     ram_addr_t ram_addr;
 145     ram_addr_t kernel_size = 0;
 146     ram_addr_t initrd_offset;
 147     ram_addr_t initrd_size = 0;
 148     int i;
 149
 150     /* XXX we only work on KVM for now */
 151
 152     if (!kvm_enabled()) {
 153         fprintf(stderr, "The S390 target only works with KVM enabled\n");
 154         exit(1);
 155     }
 156
 157     /* get a BUS */
 158     s390_bus = s390_virtio_bus_init(&ram_size);
 159
 160     /* allocate RAM */
 161     ram_addr = qemu_ram_alloc(NULL, "s390.ram", ram_size);
 162     cpu_register_physical_memory(0, ram_size, ram_addr);
 163
 164     /* init CPUs */
 165     if (cpu_model == NULL) {
 166         cpu_model = "host";
 167     }
 168
 169     ipi_states = qemu_malloc(sizeof(CPUState *) * smp_cpus);
 170
 171     for (i = 0; i < smp_cpus; i++) {
 172         CPUState *tmp_env;
 173
 174         tmp_env = cpu_init(cpu_model);
 175         if (!env) {
 176             env = tmp_env;
 177         }
 178         ipi_states[i] = tmp_env;
 179         tmp_env->halted = 1;
 180         tmp_env->exception_index = EXCP_HLT;
 181     }
 182
 183     env->halted = 0;
 184     env->exception_index = 0;
 185
 186     if (kernel_filename) {
 187         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 188
 189         if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
 190             fprintf(stderr, "Specified image is not an s390 boot image\n");
 191             exit(1);
 192         }
 193
 194         env->psw.addr = KERN_IMAGE_START;
 195         env->psw.mask = 0x0000000180000000ULL;
 196     } else {
 197         ram_addr_t bios_size = 0;
 198         char *bios_filename;
 199
 200         /* Load zipl bootloader */
 201         if (bios_name == NULL) {
 202             bios_name = ZIPL_FILENAME;
 203         }
 204
 205         bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 206         bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));
 207         qemu_free(bios_filename);
 208
 209         if ((long)bios_size < 0) {
 210             hw_error("could not load bootloader '%s'\n", bios_name);
 211         }
 212
 213         if (bios_size > 4096) {
 214             hw_error("stage1 bootloader is > 4k\n");
 215         }
 216
 217         env->psw.addr = ZIPL_START;
 218         env->psw.mask = 0x0000000180000000ULL;
 219     }
 220
 221     if (initrd_filename) {
 222         initrd_offset = INITRD_START;
 223         while (kernel_size + 0x100000 > initrd_offset) {
 224             initrd_offset += 0x100000;
 225         }
 226         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 227
 228         stq_phys(INITRD_PARM_START, initrd_offset);
 229         stq_phys(INITRD_PARM_SIZE, initrd_size);
 230     }
 231
 232     if (kernel_cmdline) {
 233         cpu_physical_memory_write(KERN_PARM_AREA, kernel_cmdline,
 234                                   strlen(kernel_cmdline));
 235     }
 236
 237     /* Create VirtIO network adapters */
 238     for(i = 0; i < nb_nics; i++) {
 239         NICInfo *nd = &nd_table[i];
 240         DeviceState *dev;
 241
 242         if (!nd->model) {
 243             nd->model = qemu_strdup("virtio");
 244         }
 245
 246         if (strcmp(nd->model, "virtio")) {
 247             fprintf(stderr, "S390 only supports VirtIO nics\n");
 248             exit(1);
 249         }
 250
 251         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 252         qdev_set_nic_properties(dev, nd);
 253         qdev_init_nofail(dev);
 254     }
 255
 256     /* Create VirtIO disk drives */
 257     for(i = 0; i < MAX_BLK_DEVS; i++) {
 258         DriveInfo *dinfo;
 259         DeviceState *dev;
 260
 261         dinfo = drive_get(IF_IDE, 0, i);
 262         if (!dinfo) {
 263             continue;
 264         }
 265
 266         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 267         qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
 268         qdev_init_nofail(dev);
 269     }
 270 }
 271
 272 static QEMUMachine s390_machine = {
 273     .name = "s390-virtio",
 274     .alias = "s390",
 275     .desc = "VirtIO based S390 machine",
 276     .init = s390_init,
 277     .no_serial = 1,
 278     .no_parallel = 1,
 279     .use_virtcon = 1,
 280     .no_vga = 1,
 281     .max_cpus = 255,
 282     .is_default = 1,
 283 };
 284
 285 static void s390_machine_init(void)
 286 {
 287     qemu_register_machine(&s390_machine);
 288 }
 289
 290 machine_init(s390_machine_init);