arch/ia64/xen/xcom_hcall.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  15  *
  16  *          Tristan Gingold <tristan.gingold@bull.net>
  17  *
  18  *          Copyright (c) 2007
  19  *          Isaku Yamahata <yamahata at valinux co jp>
  20  *                          VA Linux Systems Japan K.K.
  21  *          consolidate mini and inline version.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <xen/interface/xen.h>
  26 #include <xen/interface/memory.h>
  27 #include <xen/interface/grant_table.h>
  28 #include <xen/interface/callback.h>
  29 #include <xen/interface/vcpu.h>
  30 #include <asm/xen/hypervisor.h>
  31 #include <asm/xen/xencomm.h>
  32
  33 /* Xencomm notes:
  34  * This file defines hypercalls to be used by xencomm.  The hypercalls simply
  35  * create inlines or mini descriptors for pointers and then call the raw arch
  36  * hypercall xencomm_arch_hypercall_XXX
  37  *
  38  * If the arch wants to directly use these hypercalls, simply define macros
  39  * in asm/xen/hypercall.h, eg:
  40  *  #define HYPERVISOR_sched_op xencomm_hypercall_sched_op
  41  *
  42  * The arch may also define HYPERVISOR_xxx as a function and do more operations
  43  * before/after doing the hypercall.
  44  *
  45  * Note: because only inline or mini descriptors are created these functions
  46  * must only be called with in kernel memory parameters.
  47  */
  48
  49 int
  50 xencomm_hypercall_console_io(int cmd, int count, char *str)
  51 {
  52         return xencomm_arch_hypercall_console_io
  53                 (cmd, count, xencomm_map_no_alloc(str, count));
  54 }
  55 EXPORT_SYMBOL_GPL(xencomm_hypercall_console_io);
  56
  57 int
  58 xencomm_hypercall_event_channel_op(int cmd, void *op)
  59 {
  60         struct xencomm_handle *desc;
  61         desc = xencomm_map_no_alloc(op, sizeof(struct evtchn_op));
  62         if (desc == NULL)
  63                 return -EINVAL;
  64
  65         return xencomm_arch_hypercall_event_channel_op(cmd, desc);
  66 }
  67 EXPORT_SYMBOL_GPL(xencomm_hypercall_event_channel_op);
  68
  69 int
  70 xencomm_hypercall_xen_version(int cmd, void *arg)
  71 {
  72         struct xencomm_handle *desc;
  73         unsigned int argsize;
  74
  75         switch (cmd) {
  76         case XENVER_version:
  77                 /* do not actually pass an argument */
  78                 return xencomm_arch_hypercall_xen_version(cmd, 0);
  79         case XENVER_extraversion:
  80                 argsize = sizeof(struct xen_extraversion);
  81                 break;
  82         case XENVER_compile_info:
  83                 argsize = sizeof(struct xen_compile_info);
  84                 break;
  85         case XENVER_capabilities:
  86                 argsize = sizeof(struct xen_capabilities_info);
  87                 break;
  88         case XENVER_changeset:
  89                 argsize = sizeof(struct xen_changeset_info);
  90                 break;
  91         case XENVER_platform_parameters:
  92                 argsize = sizeof(struct xen_platform_parameters);
  93                 break;
  94         case XENVER_get_features:
  95                 argsize = (arg == NULL) ? 0 : sizeof(struct xen_feature_info);
  96                 break;
  97
  98         default:
  99                 printk(KERN_DEBUG
 100                        "%s: unknown version op %d\n", __func__, cmd);
 101                 return -ENOSYS;
 102         }
 103
 104         desc = xencomm_map_no_alloc(arg, argsize);
 105         if (desc == NULL)
 106                 return -EINVAL;
 107
 108         return xencomm_arch_hypercall_xen_version(cmd, desc);
 109 }
 110 EXPORT_SYMBOL_GPL(xencomm_hypercall_xen_version);
 111
 112 int
 113 xencomm_hypercall_physdev_op(int cmd, void *op)
 114 {
 115         unsigned int argsize;
 116
 117         switch (cmd) {
 118         case PHYSDEVOP_apic_read:
 119         case PHYSDEVOP_apic_write:
 120                 argsize = sizeof(struct physdev_apic);
 121                 break;
 122         case PHYSDEVOP_alloc_irq_vector:
 123         case PHYSDEVOP_free_irq_vector:
 124                 argsize = sizeof(struct physdev_irq);
 125                 break;
 126         case PHYSDEVOP_irq_status_query:
 127                 argsize = sizeof(struct physdev_irq_status_query);
 128                 break;
 129
 130         default:
 131                 printk(KERN_DEBUG
 132                        "%s: unknown physdev op %d\n", __func__, cmd);
 133                 return -ENOSYS;
 134         }
 135
 136         return xencomm_arch_hypercall_physdev_op
 137                 (cmd, xencomm_map_no_alloc(op, argsize));
 138 }
 139
 140 static int
 141 xencommize_grant_table_op(struct xencomm_mini **xc_area,
 142                           unsigned int cmd, void *op, unsigned int count,
 143                           struct xencomm_handle **desc)
 144 {
 145         struct xencomm_handle *desc1;
 146         unsigned int argsize;
 147
 148         switch (cmd) {
 149         case GNTTABOP_map_grant_ref:
 150                 argsize = sizeof(struct gnttab_map_grant_ref);
 151                 break;
 152         case GNTTABOP_unmap_grant_ref:
 153                 argsize = sizeof(struct gnttab_unmap_grant_ref);
 154                 break;
 155         case GNTTABOP_setup_table:
 156         {
 157                 struct gnttab_setup_table *setup = op;
 158
 159                 argsize = sizeof(*setup);
 160
 161                 if (count != 1)
 162                         return -EINVAL;
 163                 desc1 = __xencomm_map_no_alloc
 164                         (xen_guest_handle(setup->frame_list),
 165                          setup->nr_frames *
 166                          sizeof(*xen_guest_handle(setup->frame_list)),
 167                          *xc_area);
 168                 if (desc1 == NULL)
 169                         return -EINVAL;
 170                 (*xc_area)++;
 171                 set_xen_guest_handle(setup->frame_list, (void *)desc1);
 172                 break;
 173         }
 174         case GNTTABOP_dump_table:
 175                 argsize = sizeof(struct gnttab_dump_table);
 176                 break;
 177         case GNTTABOP_transfer:
 178                 argsize = sizeof(struct gnttab_transfer);
 179                 break;
 180         case GNTTABOP_copy:
 181                 argsize = sizeof(struct gnttab_copy);
 182                 break;
 183         case GNTTABOP_query_size:
 184                 argsize = sizeof(struct gnttab_query_size);
 185                 break;
 186         default:
 187                 printk(KERN_DEBUG "%s: unknown hypercall grant table op %d\n",
 188                        __func__, cmd);
 189                 BUG();
 190         }
 191
 192         *desc = __xencomm_map_no_alloc(op, count * argsize, *xc_area);
 193         if (*desc == NULL)
 194                 return -EINVAL;
 195         (*xc_area)++;
 196
 197         return 0;
 198 }
 199
 200 int
 201 xencomm_hypercall_grant_table_op(unsigned int cmd, void *op,
 202                                  unsigned int count)
 203 {
 204         int rc;
 205         struct xencomm_handle *desc;
 206         XENCOMM_MINI_ALIGNED(xc_area, 2);
 207
 208         rc = xencommize_grant_table_op(&xc_area, cmd, op, count, &desc);
 209         if (rc)
 210                 return rc;
 211
 212         return xencomm_arch_hypercall_grant_table_op(cmd, desc, count);
 213 }
 214 EXPORT_SYMBOL_GPL(xencomm_hypercall_grant_table_op);
 215
 216 int
 217 xencomm_hypercall_sched_op(int cmd, void *arg)
 218 {
 219         struct xencomm_handle *desc;
 220         unsigned int argsize;
 221
 222         switch (cmd) {
 223         case SCHEDOP_yield:
 224         case SCHEDOP_block:
 225                 argsize = 0;
 226                 break;
 227         case SCHEDOP_shutdown:
 228                 argsize = sizeof(struct sched_shutdown);
 229                 break;
 230         case SCHEDOP_poll:
 231         {
 232                 struct sched_poll *poll = arg;
 233                 struct xencomm_handle *ports;
 234
 235                 argsize = sizeof(struct sched_poll);
 236                 ports = xencomm_map_no_alloc(xen_guest_handle(poll->ports),
 237                                      sizeof(*xen_guest_handle(poll->ports)));
 238
 239                 set_xen_guest_handle(poll->ports, (void *)ports);
 240                 break;
 241         }
 242         default:
 243                 printk(KERN_DEBUG "%s: unknown sched op %d\n", __func__, cmd);
 244                 return -ENOSYS;
 245         }
 246
 247         desc = xencomm_map_no_alloc(arg, argsize);
 248         if (desc == NULL)
 249                 return -EINVAL;
 250
 251         return xencomm_arch_hypercall_sched_op(cmd, desc);
 252 }
 253 EXPORT_SYMBOL_GPL(xencomm_hypercall_sched_op);
 254
 255 int
 256 xencomm_hypercall_multicall(void *call_list, int nr_calls)
 257 {
 258         int rc;
 259         int i;
 260         struct multicall_entry *mce;
 261         struct xencomm_handle *desc;
 262         XENCOMM_MINI_ALIGNED(xc_area, nr_calls * 2);
 263
 264         for (i = 0; i < nr_calls; i++) {
 265                 mce = (struct multicall_entry *)call_list + i;
 266
 267                 switch (mce->op) {
 268                 case __HYPERVISOR_update_va_mapping:
 269                 case __HYPERVISOR_mmu_update:
 270                         /* No-op on ia64.  */
 271                         break;
 272                 case __HYPERVISOR_grant_table_op:
 273                         rc = xencommize_grant_table_op
 274                                 (&xc_area,
 275                                  mce->args[0], (void *)mce->args[1],
 276                                  mce->args[2], &desc);
 277                         if (rc)
 278                                 return rc;
 279                         mce->args[1] = (unsigned long)desc;
 280                         break;
 281                 case __HYPERVISOR_memory_op:
 282                 default:
 283                         printk(KERN_DEBUG
 284                                "%s: unhandled multicall op entry op %lu\n",
 285                                __func__, mce->op);
 286                         return -ENOSYS;
 287                 }
 288         }
 289
 290         desc = xencomm_map_no_alloc(call_list,
 291                                     nr_calls * sizeof(struct multicall_entry));
 292         if (desc == NULL)
 293                 return -EINVAL;
 294
 295         return xencomm_arch_hypercall_multicall(desc, nr_calls);
 296 }
 297 EXPORT_SYMBOL_GPL(xencomm_hypercall_multicall);
 298
 299 int
 300 xencomm_hypercall_callback_op(int cmd, void *arg)
 301 {
 302         unsigned int argsize;
 303         switch (cmd) {
 304         case CALLBACKOP_register:
 305                 argsize = sizeof(struct callback_register);
 306                 break;
 307         case CALLBACKOP_unregister:
 308                 argsize = sizeof(struct callback_unregister);
 309                 break;
 310         default:
 311                 printk(KERN_DEBUG
 312                        "%s: unknown callback op %d\n", __func__, cmd);
 313                 return -ENOSYS;
 314         }
 315
 316         return xencomm_arch_hypercall_callback_op
 317                 (cmd, xencomm_map_no_alloc(arg, argsize));
 318 }
 319
 320 static int
 321 xencommize_memory_reservation(struct xencomm_mini *xc_area,
 322                               struct xen_memory_reservation *mop)
 323 {
 324         struct xencomm_handle *desc;
 325
 326         desc = __xencomm_map_no_alloc(xen_guest_handle(mop->extent_start),
 327                         mop->nr_extents *
 328                         sizeof(*xen_guest_handle(mop->extent_start)),
 329                         xc_area);
 330         if (desc == NULL)
 331                 return -EINVAL;
 332
 333         set_xen_guest_handle(mop->extent_start, (void *)desc);
 334         return 0;
 335 }
 336
 337 int
 338 xencomm_hypercall_memory_op(unsigned int cmd, void *arg)
 339 {
 340         GUEST_HANDLE(xen_pfn_t) extent_start_va[2] = { {NULL}, {NULL} };
 341         struct xen_memory_reservation *xmr = NULL;
 342         int rc;
 343         struct xencomm_handle *desc;
 344         unsigned int argsize;
 345         XENCOMM_MINI_ALIGNED(xc_area, 2);
 346
 347         switch (cmd) {
 348         case XENMEM_increase_reservation:
 349         case XENMEM_decrease_reservation:
 350         case XENMEM_populate_physmap:
 351                 xmr = (struct xen_memory_reservation *)arg;
 352                 set_xen_guest_handle(extent_start_va[0],
 353                                      xen_guest_handle(xmr->extent_start));
 354
 355                 argsize = sizeof(*xmr);
 356                 rc = xencommize_memory_reservation(xc_area, xmr);
 357                 if (rc)
 358                         return rc;
 359                 xc_area++;
 360                 break;
 361
 362         case XENMEM_maximum_ram_page:
 363                 argsize = 0;
 364                 break;
 365
 366         case XENMEM_add_to_physmap:
 367                 argsize = sizeof(struct xen_add_to_physmap);
 368                 break;
 369
 370         default:
 371                 printk(KERN_DEBUG "%s: unknown memory op %d\n", __func__, cmd);
 372                 return -ENOSYS;
 373         }
 374
 375         desc = xencomm_map_no_alloc(arg, argsize);
 376         if (desc == NULL)
 377                 return -EINVAL;
 378
 379         rc = xencomm_arch_hypercall_memory_op(cmd, desc);
 380
 381         switch (cmd) {
 382         case XENMEM_increase_reservation:
 383         case XENMEM_decrease_reservation:
 384         case XENMEM_populate_physmap:
 385                 set_xen_guest_handle(xmr->extent_start,
 386                                      xen_guest_handle(extent_start_va[0]));
 387                 break;
 388         }
 389
 390         return rc;
 391 }
 392 EXPORT_SYMBOL_GPL(xencomm_hypercall_memory_op);
 393
 394 long
 395 xencomm_hypercall_vcpu_op(int cmd, int cpu, void *arg)
 396 {
 397         unsigned int argsize;
 398         switch (cmd) {
 399         case VCPUOP_register_runstate_memory_area: {
 400                 struct vcpu_register_runstate_memory_area *area =
 401                         (struct vcpu_register_runstate_memory_area *)arg;
 402                 argsize = sizeof(*arg);
 403                 set_xen_guest_handle(area->addr.h,
 404                      (void *)xencomm_map_no_alloc(area->addr.v,
 405                                                   sizeof(area->addr.v)));
 406                 break;
 407         }
 408
 409         default:
 410                 printk(KERN_DEBUG "%s: unknown vcpu op %d\n", __func__, cmd);
 411                 return -ENOSYS;
 412         }
 413
 414         return xencomm_arch_hypercall_vcpu_op(cmd, cpu,
 415                                         xencomm_map_no_alloc(arg, argsize));
 416 }
 417
 418 long
 419 xencomm_hypercall_opt_feature(void *arg)
 420 {
 421         return xencomm_arch_hypercall_opt_feature(
 422                 xencomm_map_no_alloc(arg,
 423                                      sizeof(struct xen_ia64_opt_feature)));
 424 }