arch/x86/include/asm/xen/hypercall.h

   1 /******************************************************************************
   2  * hypercall.h
   3  *
   4  * Linux-specific hypervisor handling.
   5  *
   6  * Copyright (c) 2002-2004, K A Fraser
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version 2
  10  * as published by the Free Software Foundation; or, when distributed
  11  * separately from the Linux kernel or incorporated into other
  12  * software packages, subject to the following license:
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a copy
  15  * of this source file (the "Software"), to deal in the Software without
  16  * restriction, including without limitation the rights to use, copy, modify,
  17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
  18  * and to permit persons to whom the Software is furnished to do so, subject to
  19  * the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  30  * IN THE SOFTWARE.
  31  */
  32
  33 #ifndef _ASM_X86_XEN_HYPERCALL_H
  34 #define _ASM_X86_XEN_HYPERCALL_H
  35
  36 #include <linux/kernel.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/errno.h>
  39 #include <linux/string.h>
  40 #include <linux/types.h>
  41
  42 #include <trace/events/xen.h>
  43
  44 #include <asm/page.h>
  45 #include <asm/pgtable.h>
  46
  47 #include <xen/interface/xen.h>
  48 #include <xen/interface/sched.h>
  49 #include <xen/interface/physdev.h>
  50 #include <xen/interface/platform.h>
  51
  52 /*
  53  * The hypercall asms have to meet several constraints:
  54  * - Work on 32- and 64-bit.
  55  *    The two architectures put their arguments in different sets of
  56  *    registers.
  57  *
  58  * - Work around asm syntax quirks
  59  *    It isn't possible to specify one of the rNN registers in a
  60  *    constraint, so we use explicit register variables to get the
  61  *    args into the right place.
  62  *
  63  * - Mark all registers as potentially clobbered
  64  *    Even unused parameters can be clobbered by the hypervisor, so we
  65  *    need to make sure gcc knows it.
  66  *
  67  * - Avoid compiler bugs.
  68  *    This is the tricky part.  Because x86_32 has such a constrained
  69  *    register set, gcc versions below 4.3 have trouble generating
  70  *    code when all the arg registers and memory are trashed by the
  71  *    asm.  There are syntactically simpler ways of achieving the
  72  *    semantics below, but they cause the compiler to crash.
  73  *
  74  *    The only combination I found which works is:
  75  *     - assign the __argX variables first
  76  *     - list all actually used parameters as "+r" (__argX)
  77  *     - clobber the rest
  78  *
  79  * The result certainly isn't pretty, and it really shows up cpp's
  80  * weakness as as macro language.  Sorry.  (But let's just give thanks
  81  * there aren't more than 5 arguments...)
  82  */
  83
  84 extern struct { char _entry[32]; } hypercall_page[];
  85
  86 #define __HYPERCALL             "call hypercall_page+%c[offset]"
  87 #define __HYPERCALL_ENTRY(x)                                            \
  88         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
  89
  90 #ifdef CONFIG_X86_32
  91 #define __HYPERCALL_RETREG      "eax"
  92 #define __HYPERCALL_ARG1REG     "ebx"
  93 #define __HYPERCALL_ARG2REG     "ecx"
  94 #define __HYPERCALL_ARG3REG     "edx"
  95 #define __HYPERCALL_ARG4REG     "esi"
  96 #define __HYPERCALL_ARG5REG     "edi"
  97 #else
  98 #define __HYPERCALL_RETREG      "rax"
  99 #define __HYPERCALL_ARG1REG     "rdi"
 100 #define __HYPERCALL_ARG2REG     "rsi"
 101 #define __HYPERCALL_ARG3REG     "rdx"
 102 #define __HYPERCALL_ARG4REG     "r10"
 103 #define __HYPERCALL_ARG5REG     "r8"
 104 #endif
 105
 106 #define __HYPERCALL_DECLS                                               \
 107         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
 108         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
 109         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
 110         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
 111         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
 112         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
 113
 114 #define __HYPERCALL_0PARAM      "=r" (__res)
 115 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
 116 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
 117 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
 118 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
 119 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
 120
 121 #define __HYPERCALL_0ARG()
 122 #define __HYPERCALL_1ARG(a1)                                            \
 123         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
 124 #define __HYPERCALL_2ARG(a1,a2)                                         \
 125         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
 126 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
 127         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
 128 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
 129         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
 130 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
 131         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
 132
 133 #define __HYPERCALL_CLOBBER5    "memory"
 134 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 135 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 136 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 137 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 138 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 139
 140 #define _hypercall0(type, name)                                         \
 141 ({                                                                      \
 142         __HYPERCALL_DECLS;                                              \
 143         __HYPERCALL_0ARG();                                             \
 144         asm volatile (__HYPERCALL                                       \
 145                       : __HYPERCALL_0PARAM                              \
 146                       : __HYPERCALL_ENTRY(name)                         \
 147                       : __HYPERCALL_CLOBBER0);                          \
 148         (type)__res;                                                    \
 149 })
 150
 151 #define _hypercall1(type, name, a1)                                     \
 152 ({                                                                      \
 153         __HYPERCALL_DECLS;                                              \
 154         __HYPERCALL_1ARG(a1);                                           \
 155         asm volatile (__HYPERCALL                                       \
 156                       : __HYPERCALL_1PARAM                              \
 157                       : __HYPERCALL_ENTRY(name)                         \
 158                       : __HYPERCALL_CLOBBER1);                          \
 159         (type)__res;                                                    \
 160 })
 161
 162 #define _hypercall2(type, name, a1, a2)                                 \
 163 ({                                                                      \
 164         __HYPERCALL_DECLS;                                              \
 165         __HYPERCALL_2ARG(a1, a2);                                       \
 166         asm volatile (__HYPERCALL                                       \
 167                       : __HYPERCALL_2PARAM                              \
 168                       : __HYPERCALL_ENTRY(name)                         \
 169                       : __HYPERCALL_CLOBBER2);                          \
 170         (type)__res;                                                    \
 171 })
 172
 173 #define _hypercall3(type, name, a1, a2, a3)                             \
 174 ({                                                                      \
 175         __HYPERCALL_DECLS;                                              \
 176         __HYPERCALL_3ARG(a1, a2, a3);                                   \
 177         asm volatile (__HYPERCALL                                       \
 178                       : __HYPERCALL_3PARAM                              \
 179                       : __HYPERCALL_ENTRY(name)                         \
 180                       : __HYPERCALL_CLOBBER3);                          \
 181         (type)__res;                                                    \
 182 })
 183
 184 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
 185 ({                                                                      \
 186         __HYPERCALL_DECLS;                                              \
 187         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 188         asm volatile (__HYPERCALL                                       \
 189                       : __HYPERCALL_4PARAM                              \
 190                       : __HYPERCALL_ENTRY(name)                         \
 191                       : __HYPERCALL_CLOBBER4);                          \
 192         (type)__res;                                                    \
 193 })
 194
 195 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 196 ({                                                                      \
 197         __HYPERCALL_DECLS;                                              \
 198         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 199         asm volatile (__HYPERCALL                                       \
 200                       : __HYPERCALL_5PARAM                              \
 201                       : __HYPERCALL_ENTRY(name)                         \
 202                       : __HYPERCALL_CLOBBER5);                          \
 203         (type)__res;                                                    \
 204 })
 205
 206 static inline long
 207 privcmd_call(unsigned call,
 208              unsigned long a1, unsigned long a2,
 209              unsigned long a3, unsigned long a4,
 210              unsigned long a5)
 211 {
 212         __HYPERCALL_DECLS;
 213         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 214
 215         asm volatile("call *%[call]"
 216                      : __HYPERCALL_5PARAM
 217                      : [call] "a" (&hypercall_page[call])
 218                      : __HYPERCALL_CLOBBER5);
 219
 220         return (long)__res;
 221 }
 222
 223 static inline int
 224 HYPERVISOR_set_trap_table(struct trap_info *table)
 225 {
 226         return _hypercall1(int, set_trap_table, table);
 227 }
 228
 229 static inline int
 230 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 231                       int *success_count, domid_t domid)
 232 {
 233         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 234 }
 235
 236 static inline int
 237 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 238                      int *success_count, domid_t domid)
 239 {
 240         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 241 }
 242
 243 static inline int
 244 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 245 {
 246         return _hypercall2(int, set_gdt, frame_list, entries);
 247 }
 248
 249 static inline int
 250 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 251 {
 252         return _hypercall2(int, stack_switch, ss, esp);
 253 }
 254
 255 #ifdef CONFIG_X86_32
 256 static inline int
 257 HYPERVISOR_set_callbacks(unsigned long event_selector,
 258                          unsigned long event_address,
 259                          unsigned long failsafe_selector,
 260                          unsigned long failsafe_address)
 261 {
 262         return _hypercall4(int, set_callbacks,
 263                            event_selector, event_address,
 264                            failsafe_selector, failsafe_address);
 265 }
 266 #else  /* CONFIG_X86_64 */
 267 static inline int
 268 HYPERVISOR_set_callbacks(unsigned long event_address,
 269                         unsigned long failsafe_address,
 270                         unsigned long syscall_address)
 271 {
 272         return _hypercall3(int, set_callbacks,
 273                            event_address, failsafe_address,
 274                            syscall_address);
 275 }
 276 #endif  /* CONFIG_X86_{32,64} */
 277
 278 static inline int
 279 HYPERVISOR_callback_op(int cmd, void *arg)
 280 {
 281         return _hypercall2(int, callback_op, cmd, arg);
 282 }
 283
 284 static inline int
 285 HYPERVISOR_fpu_taskswitch(int set)
 286 {
 287         return _hypercall1(int, fpu_taskswitch, set);
 288 }
 289
 290 static inline int
 291 HYPERVISOR_sched_op(int cmd, void *arg)
 292 {
 293         return _hypercall2(int, sched_op, cmd, arg);
 294 }
 295
 296 static inline long
 297 HYPERVISOR_set_timer_op(u64 timeout)
 298 {
 299         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 300         unsigned long timeout_lo = (unsigned long)timeout;
 301         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 302 }
 303
 304 static inline int
 305 HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
 306 {
 307         platform_op->interface_version = XENPF_INTERFACE_VERSION;
 308         return _hypercall1(int, dom0_op, platform_op);
 309 }
 310
 311 static inline int
 312 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 313 {
 314         return _hypercall2(int, set_debugreg, reg, value);
 315 }
 316
 317 static inline unsigned long
 318 HYPERVISOR_get_debugreg(int reg)
 319 {
 320         return _hypercall1(unsigned long, get_debugreg, reg);
 321 }
 322
 323 static inline int
 324 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 325 {
 326         if (sizeof(u64) == sizeof(long))
 327                 return _hypercall2(int, update_descriptor, ma, desc);
 328         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 329 }
 330
 331 static inline int
 332 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 333 {
 334         return _hypercall2(int, memory_op, cmd, arg);
 335 }
 336
 337 static inline int
 338 HYPERVISOR_multicall(void *call_list, int nr_calls)
 339 {
 340         return _hypercall2(int, multicall, call_list, nr_calls);
 341 }
 342
 343 static inline int
 344 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 345                              unsigned long flags)
 346 {
 347         if (sizeof(new_val) == sizeof(long))
 348                 return _hypercall3(int, update_va_mapping, va,
 349                                    new_val.pte, flags);
 350         else
 351                 return _hypercall4(int, update_va_mapping, va,
 352                                    new_val.pte, new_val.pte >> 32, flags);
 353 }
 354
 355 static inline int
 356 HYPERVISOR_event_channel_op(int cmd, void *arg)
 357 {
 358         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 359         if (unlikely(rc == -ENOSYS)) {
 360                 struct evtchn_op op;
 361                 op.cmd = cmd;
 362                 memcpy(&op.u, arg, sizeof(op.u));
 363                 rc = _hypercall1(int, event_channel_op_compat, &op);
 364                 memcpy(arg, &op.u, sizeof(op.u));
 365         }
 366         return rc;
 367 }
 368
 369 static inline int
 370 HYPERVISOR_xen_version(int cmd, void *arg)
 371 {
 372         return _hypercall2(int, xen_version, cmd, arg);
 373 }
 374
 375 static inline int
 376 HYPERVISOR_console_io(int cmd, int count, char *str)
 377 {
 378         return _hypercall3(int, console_io, cmd, count, str);
 379 }
 380
 381 static inline int
 382 HYPERVISOR_physdev_op(int cmd, void *arg)
 383 {
 384         int rc = _hypercall2(int, physdev_op, cmd, arg);
 385         if (unlikely(rc == -ENOSYS)) {
 386                 struct physdev_op op;
 387                 op.cmd = cmd;
 388                 memcpy(&op.u, arg, sizeof(op.u));
 389                 rc = _hypercall1(int, physdev_op_compat, &op);
 390                 memcpy(arg, &op.u, sizeof(op.u));
 391         }
 392         return rc;
 393 }
 394
 395 static inline int
 396 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 397 {
 398         return _hypercall3(int, grant_table_op, cmd, uop, count);
 399 }
 400
 401 static inline int
 402 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 403                                          unsigned long flags, domid_t domid)
 404 {
 405         if (sizeof(new_val) == sizeof(long))
 406                 return _hypercall4(int, update_va_mapping_otherdomain, va,
 407                                    new_val.pte, flags, domid);
 408         else
 409                 return _hypercall5(int, update_va_mapping_otherdomain, va,
 410                                    new_val.pte, new_val.pte >> 32,
 411                                    flags, domid);
 412 }
 413
 414 static inline int
 415 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 416 {
 417         return _hypercall2(int, vm_assist, cmd, type);
 418 }
 419
 420 static inline int
 421 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 422 {
 423         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 424 }
 425
 426 #ifdef CONFIG_X86_64
 427 static inline int
 428 HYPERVISOR_set_segment_base(int reg, unsigned long value)
 429 {
 430         return _hypercall2(int, set_segment_base, reg, value);
 431 }
 432 #endif
 433
 434 static inline int
 435 HYPERVISOR_suspend(unsigned long start_info_mfn)
 436 {
 437         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
 438
 439         /*
 440          * For a PV guest the tools require that the start_info mfn be
 441          * present in rdx/edx when the hypercall is made. Per the
 442          * hypercall calling convention this is the third hypercall
 443          * argument, which is start_info_mfn here.
 444          */
 445         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
 446 }
 447
 448 static inline int
 449 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 450 {
 451         return _hypercall2(int, nmi_op, op, arg);
 452 }
 453
 454 static inline unsigned long __must_check
 455 HYPERVISOR_hvm_op(int op, void *arg)
 456 {
 457        return _hypercall2(unsigned long, hvm_op, op, arg);
 458 }
 459
 460 static inline int
 461 HYPERVISOR_tmem_op(
 462         struct tmem_op *op)
 463 {
 464         return _hypercall1(int, tmem_op, op);
 465 }
 466
 467 static inline void
 468 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 469 {
 470         mcl->op = __HYPERVISOR_fpu_taskswitch;
 471         mcl->args[0] = set;
 472
 473         trace_xen_mc_entry(mcl, 1);
 474 }
 475
 476 static inline void
 477 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 478                         pte_t new_val, unsigned long flags)
 479 {
 480         mcl->op = __HYPERVISOR_update_va_mapping;
 481         mcl->args[0] = va;
 482         if (sizeof(new_val) == sizeof(long)) {
 483                 mcl->args[1] = new_val.pte;
 484                 mcl->args[2] = flags;
 485         } else {
 486                 mcl->args[1] = new_val.pte;
 487                 mcl->args[2] = new_val.pte >> 32;
 488                 mcl->args[3] = flags;
 489         }
 490
 491         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
 492 }
 493
 494 static inline void
 495 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 496                      void *uop, unsigned int count)
 497 {
 498         mcl->op = __HYPERVISOR_grant_table_op;
 499         mcl->args[0] = cmd;
 500         mcl->args[1] = (unsigned long)uop;
 501         mcl->args[2] = count;
 502
 503         trace_xen_mc_entry(mcl, 3);
 504 }
 505
 506 static inline void
 507 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 508                                     pte_t new_val, unsigned long flags,
 509                                     domid_t domid)
 510 {
 511         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 512         mcl->args[0] = va;
 513         if (sizeof(new_val) == sizeof(long)) {
 514                 mcl->args[1] = new_val.pte;
 515                 mcl->args[2] = flags;
 516                 mcl->args[3] = domid;
 517         } else {
 518                 mcl->args[1] = new_val.pte;
 519                 mcl->args[2] = new_val.pte >> 32;
 520                 mcl->args[3] = flags;
 521                 mcl->args[4] = domid;
 522         }
 523
 524         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
 525 }
 526
 527 static inline void
 528 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 529                         struct desc_struct desc)
 530 {
 531         mcl->op = __HYPERVISOR_update_descriptor;
 532         if (sizeof(maddr) == sizeof(long)) {
 533                 mcl->args[0] = maddr;
 534                 mcl->args[1] = *(unsigned long *)&desc;
 535         } else {
 536                 mcl->args[0] = maddr;
 537                 mcl->args[1] = maddr >> 32;
 538                 mcl->args[2] = desc.a;
 539                 mcl->args[3] = desc.b;
 540         }
 541
 542         trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
 543 }
 544
 545 static inline void
 546 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 547 {
 548         mcl->op = __HYPERVISOR_memory_op;
 549         mcl->args[0] = cmd;
 550         mcl->args[1] = (unsigned long)arg;
 551
 552         trace_xen_mc_entry(mcl, 2);
 553 }
 554
 555 static inline void
 556 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 557                  int count, int *success_count, domid_t domid)
 558 {
 559         mcl->op = __HYPERVISOR_mmu_update;
 560         mcl->args[0] = (unsigned long)req;
 561         mcl->args[1] = count;
 562         mcl->args[2] = (unsigned long)success_count;
 563         mcl->args[3] = domid;
 564
 565         trace_xen_mc_entry(mcl, 4);
 566 }
 567
 568 static inline void
 569 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 570                 int *success_count, domid_t domid)
 571 {
 572         mcl->op = __HYPERVISOR_mmuext_op;
 573         mcl->args[0] = (unsigned long)op;
 574         mcl->args[1] = count;
 575         mcl->args[2] = (unsigned long)success_count;
 576         mcl->args[3] = domid;
 577
 578         trace_xen_mc_entry(mcl, 4);
 579 }
 580
 581 static inline void
 582 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 583 {
 584         mcl->op = __HYPERVISOR_set_gdt;
 585         mcl->args[0] = (unsigned long)frames;
 586         mcl->args[1] = entries;
 587
 588         trace_xen_mc_entry(mcl, 2);
 589 }
 590
 591 static inline void
 592 MULTI_stack_switch(struct multicall_entry *mcl,
 593                    unsigned long ss, unsigned long esp)
 594 {
 595         mcl->op = __HYPERVISOR_stack_switch;
 596         mcl->args[0] = ss;
 597         mcl->args[1] = esp;
 598
 599         trace_xen_mc_entry(mcl, 2);
 600 }
 601
 602 #endif /* _ASM_X86_XEN_HYPERCALL_H */