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 "sysemu.h"
  23 #include "net.h"
  24 #include "boards.h"
  25 #include "monitor.h"
  26 #include "loader.h"
  27 #include "elf.h"
  28 #include "hw/virtio.h"
  29 #include "hw/virtio-console.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 MAX_BLK_DEVS                    10
  57
  58 static VirtIOS390Bus *s390_bus;
  59 static CPUState **ipi_states;
  60
  61 void irq_info(Monitor *mon);
  62 void pic_info(Monitor *mon);
  63
  64 void irq_info(Monitor *mon)
  65 {
  66 }
  67
  68 void pic_info(Monitor *mon)
  69 {
  70 }
  71
  72 CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
  73 {
  74     if (cpu_addr >= smp_cpus) {
  75         return NULL;
  76     }
  77
  78     return ipi_states[cpu_addr];
  79 }
  80
  81 int s390_virtio_hypercall(CPUState *env)
  82 {
  83     int r = 0, i;
  84     target_ulong mem = env->regs[2];
  85
  86     dprintf("KVM hypercall: %ld\n", env->regs[1]);
  87     switch (env->regs[1]) {
  88     case KVM_S390_VIRTIO_NOTIFY:
  89         if (mem > ram_size) {
  90             VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
  91                                                                mem, &i);
  92             if (dev) {
  93                 virtio_queue_notify(dev->vdev, i);
  94             } else {
  95                 r = -EINVAL;
  96             }
  97         } else {
  98             /* Early printk */
  99         }
 100         break;
 101     case KVM_S390_VIRTIO_RESET:
 102     {
 103         /* Virtio_reset resets the internal addresses, so we'd have to sync
 104            them up again. We don't want to reallocate a vring though, so let's
 105            just not reset. */
 106         /* virtio_reset(dev->vdev); */
 107         break;
 108     }
 109     case KVM_S390_VIRTIO_SET_STATUS:
 110     {
 111         VirtIOS390Device *dev;
 112
 113         dev = s390_virtio_bus_find_mem(s390_bus, mem);
 114         if (dev) {
 115             s390_virtio_device_update_status(dev);
 116         } else {
 117             r = -EINVAL;
 118         }
 119         break;
 120     }
 121     default:
 122         r = -EINVAL;
 123         break;
 124     }
 125
 126     env->regs[2] = r;
 127     return 0;
 128 }
 129
 130 /* PC hardware initialisation */
 131 static void s390_init(ram_addr_t ram_size,
 132                       const char *boot_device,
 133                       const char *kernel_filename,
 134                       const char *kernel_cmdline,
 135                       const char *initrd_filename,
 136                       const char *cpu_model)
 137 {
 138     CPUState *env = NULL;
 139     ram_addr_t ram_addr;
 140     ram_addr_t kernel_size = 0;
 141     ram_addr_t initrd_offset;
 142     ram_addr_t initrd_size = 0;
 143     int i;
 144
 145     /* get a BUS */
 146     s390_bus = s390_virtio_bus_init(&ram_size);
 147
 148     /* allocate RAM */
 149     ram_addr = qemu_ram_alloc(ram_size);
 150     cpu_register_physical_memory(0, ram_size, ram_addr);
 151
 152     /* init CPUs */
 153     if (cpu_model == NULL) {
 154         cpu_model = "host";
 155     }
 156
 157     ipi_states = qemu_malloc(sizeof(CPUState *) * smp_cpus);
 158
 159     for (i = 0; i < smp_cpus; i++) {
 160         CPUState *tmp_env;
 161
 162         tmp_env = cpu_init(cpu_model);
 163         if (!env) {
 164             env = tmp_env;
 165         }
 166         ipi_states[i] = tmp_env;
 167         tmp_env->halted = 1;
 168         tmp_env->exception_index = EXCP_HLT;
 169     }
 170
 171     env->halted = 0;
 172     env->exception_index = 0;
 173
 174     if (kernel_filename) {
 175         kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
 176
 177         if (lduw_phys(KERN_IMAGE_START) != 0x0dd0) {
 178             fprintf(stderr, "Specified image is not an s390 boot image\n");
 179             exit(1);
 180         }
 181
 182         cpu_synchronize_state(env);
 183         env->psw.addr = KERN_IMAGE_START;
 184         env->psw.mask = 0x0000000180000000ULL;
 185     }
 186
 187     if (initrd_filename) {
 188         initrd_offset = INITRD_START;
 189         while (kernel_size + 0x100000 > initrd_offset) {
 190             initrd_offset += 0x100000;
 191         }
 192         initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
 193
 194         stq_phys(INITRD_PARM_START, initrd_offset);
 195         stq_phys(INITRD_PARM_SIZE, initrd_size);
 196     }
 197
 198     if (kernel_cmdline) {
 199         cpu_physical_memory_rw(KERN_PARM_AREA, (uint8_t *)kernel_cmdline,
 200                                strlen(kernel_cmdline), 1);
 201     }
 202
 203     /* Create VirtIO console */
 204     qdev_init_nofail(qdev_create((BusState *)s390_bus, "virtio-console-s390"));
 205
 206     /* Create VirtIO network adapters */
 207     for(i = 0; i < nb_nics; i++) {
 208         NICInfo *nd = &nd_table[i];
 209         DeviceState *dev;
 210
 211         if (!nd->model) {
 212             nd->model = (char*)"virtio";
 213         }
 214
 215         if (strcmp(nd->model, "virtio")) {
 216             fprintf(stderr, "S390 only supports VirtIO nics\n");
 217             exit(1);
 218         }
 219
 220         dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
 221         qdev_set_nic_properties(dev, nd);
 222         qdev_init_nofail(dev);
 223     }
 224
 225     /* Create VirtIO disk drives */
 226     for(i = 0; i < MAX_BLK_DEVS; i++) {
 227         DriveInfo *dinfo;
 228         DeviceState *dev;
 229
 230         dinfo = drive_get(IF_IDE, 0, i);
 231         if (!dinfo) {
 232             continue;
 233         }
 234
 235         dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
 236         qdev_prop_set_drive(dev, "drive", dinfo);
 237         qdev_init_nofail(dev);
 238     }
 239 }
 240
 241 static QEMUMachine s390_machine = {
 242     .name = "s390-virtio",
 243     .alias = "s390",
 244     .desc = "VirtIO based S390 machine",
 245     .init = s390_init,
 246     .no_serial = 1,
 247     .no_parallel = 1,
 248     .use_virtcon = 1.
 249     .no_vga = 1,
 250     .max_cpus = 255,
 251     .is_default = 1,
 252 };
 253
 254 static void s390_machine_init(void)
 255 {
 256     qemu_register_machine(&s390_machine);
 257 }
 258
 259 machine_init(s390_machine_init);