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 #include <xen/interface/xen-mca.h>
  52
  53 /*
  54  * The hypercall asms have to meet several constraints:
  55  * - Work on 32- and 64-bit.
  56  *    The two architectures put their arguments in different sets of
  57  *    registers.
  58  *
  59  * - Work around asm syntax quirks
  60  *    It isn't possible to specify one of the rNN registers in a
  61  *    constraint, so we use explicit register variables to get the
  62  *    args into the right place.
  63  *
  64  * - Mark all registers as potentially clobbered
  65  *    Even unused parameters can be clobbered by the hypervisor, so we
  66  *    need to make sure gcc knows it.
  67  *
  68  * - Avoid compiler bugs.
  69  *    This is the tricky part.  Because x86_32 has such a constrained
  70  *    register set, gcc versions below 4.3 have trouble generating
  71  *    code when all the arg registers and memory are trashed by the
  72  *    asm.  There are syntactically simpler ways of achieving the
  73  *    semantics below, but they cause the compiler to crash.
  74  *
  75  *    The only combination I found which works is:
  76  *     - assign the __argX variables first
  77  *     - list all actually used parameters as "+r" (__argX)
  78  *     - clobber the rest
  79  *
  80  * The result certainly isn't pretty, and it really shows up cpp's
  81  * weakness as as macro language.  Sorry.  (But let's just give thanks
  82  * there aren't more than 5 arguments...)
  83  */
  84
  85 extern struct { char _entry[32]; } hypercall_page[];
  86
  87 #define __HYPERCALL             "call hypercall_page+%c[offset]"
  88 #define __HYPERCALL_ENTRY(x)                                            \
  89         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
  90
  91 #ifdef CONFIG_X86_32
  92 #define __HYPERCALL_RETREG      "eax"
  93 #define __HYPERCALL_ARG1REG     "ebx"
  94 #define __HYPERCALL_ARG2REG     "ecx"
  95 #define __HYPERCALL_ARG3REG     "edx"
  96 #define __HYPERCALL_ARG4REG     "esi"
  97 #define __HYPERCALL_ARG5REG     "edi"
  98 #else
  99 #define __HYPERCALL_RETREG      "rax"
 100 #define __HYPERCALL_ARG1REG     "rdi"
 101 #define __HYPERCALL_ARG2REG     "rsi"
 102 #define __HYPERCALL_ARG3REG     "rdx"
 103 #define __HYPERCALL_ARG4REG     "r10"
 104 #define __HYPERCALL_ARG5REG     "r8"
 105 #endif
 106
 107 #define __HYPERCALL_DECLS                                               \
 108         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
 109         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
 110         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
 111         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
 112         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
 113         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5; \
 114         register void *__sp asm(_ASM_SP);
 115
 116 #define __HYPERCALL_0PARAM      "=r" (__res), "+r" (__sp)
 117 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
 118 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
 119 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
 120 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
 121 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
 122
 123 #define __HYPERCALL_0ARG()
 124 #define __HYPERCALL_1ARG(a1)                                            \
 125         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
 126 #define __HYPERCALL_2ARG(a1,a2)                                         \
 127         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
 128 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
 129         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
 130 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
 131         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
 132 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
 133         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
 134
 135 #define __HYPERCALL_CLOBBER5    "memory"
 136 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 137 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 138 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 139 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 140 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 141
 142 #define _hypercall0(type, name)                                         \
 143 ({                                                                      \
 144         __HYPERCALL_DECLS;                                              \
 145         __HYPERCALL_0ARG();                                             \
 146         asm volatile (__HYPERCALL                                       \
 147                       : __HYPERCALL_0PARAM                              \
 148                       : __HYPERCALL_ENTRY(name)                         \
 149                       : __HYPERCALL_CLOBBER0);                          \
 150         (type)__res;                                                    \
 151 })
 152
 153 #define _hypercall1(type, name, a1)                                     \
 154 ({                                                                      \
 155         __HYPERCALL_DECLS;                                              \
 156         __HYPERCALL_1ARG(a1);                                           \
 157         asm volatile (__HYPERCALL                                       \
 158                       : __HYPERCALL_1PARAM                              \
 159                       : __HYPERCALL_ENTRY(name)                         \
 160                       : __HYPERCALL_CLOBBER1);                          \
 161         (type)__res;                                                    \
 162 })
 163
 164 #define _hypercall2(type, name, a1, a2)                                 \
 165 ({                                                                      \
 166         __HYPERCALL_DECLS;                                              \
 167         __HYPERCALL_2ARG(a1, a2);                                       \
 168         asm volatile (__HYPERCALL                                       \
 169                       : __HYPERCALL_2PARAM                              \
 170                       : __HYPERCALL_ENTRY(name)                         \
 171                       : __HYPERCALL_CLOBBER2);                          \
 172         (type)__res;                                                    \
 173 })
 174
 175 #define _hypercall3(type, name, a1, a2, a3)                             \
 176 ({                                                                      \
 177         __HYPERCALL_DECLS;                                              \
 178         __HYPERCALL_3ARG(a1, a2, a3);                                   \
 179         asm volatile (__HYPERCALL                                       \
 180                       : __HYPERCALL_3PARAM                              \
 181                       : __HYPERCALL_ENTRY(name)                         \
 182                       : __HYPERCALL_CLOBBER3);                          \
 183         (type)__res;                                                    \
 184 })
 185
 186 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
 187 ({                                                                      \
 188         __HYPERCALL_DECLS;                                              \
 189         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 190         asm volatile (__HYPERCALL                                       \
 191                       : __HYPERCALL_4PARAM                              \
 192                       : __HYPERCALL_ENTRY(name)                         \
 193                       : __HYPERCALL_CLOBBER4);                          \
 194         (type)__res;                                                    \
 195 })
 196
 197 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 198 ({                                                                      \
 199         __HYPERCALL_DECLS;                                              \
 200         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 201         asm volatile (__HYPERCALL                                       \
 202                       : __HYPERCALL_5PARAM                              \
 203                       : __HYPERCALL_ENTRY(name)                         \
 204                       : __HYPERCALL_CLOBBER5);                          \
 205         (type)__res;                                                    \
 206 })
 207
 208 static inline long
 209 privcmd_call(unsigned call,
 210              unsigned long a1, unsigned long a2,
 211              unsigned long a3, unsigned long a4,
 212              unsigned long a5)
 213 {
 214         __HYPERCALL_DECLS;
 215         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 216
 217         asm volatile("call *%[call]"
 218                      : __HYPERCALL_5PARAM
 219                      : [call] "a" (&hypercall_page[call])
 220                      : __HYPERCALL_CLOBBER5);
 221
 222         return (long)__res;
 223 }
 224
 225 static inline int
 226 HYPERVISOR_set_trap_table(struct trap_info *table)
 227 {
 228         return _hypercall1(int, set_trap_table, table);
 229 }
 230
 231 static inline int
 232 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 233                       int *success_count, domid_t domid)
 234 {
 235         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 236 }
 237
 238 static inline int
 239 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 240                      int *success_count, domid_t domid)
 241 {
 242         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 243 }
 244
 245 static inline int
 246 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 247 {
 248         return _hypercall2(int, set_gdt, frame_list, entries);
 249 }
 250
 251 static inline int
 252 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 253 {
 254         return _hypercall2(int, stack_switch, ss, esp);
 255 }
 256
 257 #ifdef CONFIG_X86_32
 258 static inline int
 259 HYPERVISOR_set_callbacks(unsigned long event_selector,
 260                          unsigned long event_address,
 261                          unsigned long failsafe_selector,
 262                          unsigned long failsafe_address)
 263 {
 264         return _hypercall4(int, set_callbacks,
 265                            event_selector, event_address,
 266                            failsafe_selector, failsafe_address);
 267 }
 268 #else  /* CONFIG_X86_64 */
 269 static inline int
 270 HYPERVISOR_set_callbacks(unsigned long event_address,
 271                         unsigned long failsafe_address,
 272                         unsigned long syscall_address)
 273 {
 274         return _hypercall3(int, set_callbacks,
 275                            event_address, failsafe_address,
 276                            syscall_address);
 277 }
 278 #endif  /* CONFIG_X86_{32,64} */
 279
 280 static inline int
 281 HYPERVISOR_callback_op(int cmd, void *arg)
 282 {
 283         return _hypercall2(int, callback_op, cmd, arg);
 284 }
 285
 286 static inline int
 287 HYPERVISOR_fpu_taskswitch(int set)
 288 {
 289         return _hypercall1(int, fpu_taskswitch, set);
 290 }
 291
 292 static inline int
 293 HYPERVISOR_sched_op(int cmd, void *arg)
 294 {
 295         return _hypercall2(int, sched_op, cmd, arg);
 296 }
 297
 298 static inline long
 299 HYPERVISOR_set_timer_op(u64 timeout)
 300 {
 301         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 302         unsigned long timeout_lo = (unsigned long)timeout;
 303         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 304 }
 305
 306 static inline int
 307 HYPERVISOR_mca(struct xen_mc *mc_op)
 308 {
 309         mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
 310         return _hypercall1(int, mca, mc_op);
 311 }
 312
 313 static inline int
 314 HYPERVISOR_platform_op(struct xen_platform_op *op)
 315 {
 316         op->interface_version = XENPF_INTERFACE_VERSION;
 317         return _hypercall1(int, platform_op, op);
 318 }
 319
 320 static inline int
 321 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 322 {
 323         return _hypercall2(int, set_debugreg, reg, value);
 324 }
 325
 326 static inline unsigned long
 327 HYPERVISOR_get_debugreg(int reg)
 328 {
 329         return _hypercall1(unsigned long, get_debugreg, reg);
 330 }
 331
 332 static inline int
 333 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 334 {
 335         if (sizeof(u64) == sizeof(long))
 336                 return _hypercall2(int, update_descriptor, ma, desc);
 337         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 338 }
 339
 340 static inline long
 341 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 342 {
 343         return _hypercall2(long, memory_op, cmd, arg);
 344 }
 345
 346 static inline int
 347 HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
 348 {
 349         return _hypercall2(int, multicall, call_list, nr_calls);
 350 }
 351
 352 static inline int
 353 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 354                              unsigned long flags)
 355 {
 356         if (sizeof(new_val) == sizeof(long))
 357                 return _hypercall3(int, update_va_mapping, va,
 358                                    new_val.pte, flags);
 359         else
 360                 return _hypercall4(int, update_va_mapping, va,
 361                                    new_val.pte, new_val.pte >> 32, flags);
 362 }
 363 extern int __must_check xen_event_channel_op_compat(int, void *);
 364
 365 static inline int
 366 HYPERVISOR_event_channel_op(int cmd, void *arg)
 367 {
 368         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 369         if (unlikely(rc == -ENOSYS))
 370                 rc = xen_event_channel_op_compat(cmd, arg);
 371         return rc;
 372 }
 373
 374 static inline int
 375 HYPERVISOR_xen_version(int cmd, void *arg)
 376 {
 377         return _hypercall2(int, xen_version, cmd, arg);
 378 }
 379
 380 static inline int
 381 HYPERVISOR_console_io(int cmd, int count, char *str)
 382 {
 383         return _hypercall3(int, console_io, cmd, count, str);
 384 }
 385
 386 extern int __must_check xen_physdev_op_compat(int, void *);
 387
 388 static inline int
 389 HYPERVISOR_physdev_op(int cmd, void *arg)
 390 {
 391         int rc = _hypercall2(int, physdev_op, cmd, arg);
 392         if (unlikely(rc == -ENOSYS))
 393                 rc = xen_physdev_op_compat(cmd, arg);
 394         return rc;
 395 }
 396
 397 static inline int
 398 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 399 {
 400         return _hypercall3(int, grant_table_op, cmd, uop, count);
 401 }
 402
 403 static inline int
 404 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 405                                          unsigned long flags, domid_t domid)
 406 {
 407         if (sizeof(new_val) == sizeof(long))
 408                 return _hypercall4(int, update_va_mapping_otherdomain, va,
 409                                    new_val.pte, flags, domid);
 410         else
 411                 return _hypercall5(int, update_va_mapping_otherdomain, va,
 412                                    new_val.pte, new_val.pte >> 32,
 413                                    flags, domid);
 414 }
 415
 416 static inline int
 417 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 418 {
 419         return _hypercall2(int, vm_assist, cmd, type);
 420 }
 421
 422 static inline int
 423 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 424 {
 425         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 426 }
 427
 428 #ifdef CONFIG_X86_64
 429 static inline int
 430 HYPERVISOR_set_segment_base(int reg, unsigned long value)
 431 {
 432         return _hypercall2(int, set_segment_base, reg, value);
 433 }
 434 #endif
 435
 436 static inline int
 437 HYPERVISOR_suspend(unsigned long start_info_mfn)
 438 {
 439         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
 440
 441         /*
 442          * For a PV guest the tools require that the start_info mfn be
 443          * present in rdx/edx when the hypercall is made. Per the
 444          * hypercall calling convention this is the third hypercall
 445          * argument, which is start_info_mfn here.
 446          */
 447         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
 448 }
 449
 450 static inline int
 451 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 452 {
 453         return _hypercall2(int, nmi_op, op, arg);
 454 }
 455
 456 static inline unsigned long __must_check
 457 HYPERVISOR_hvm_op(int op, void *arg)
 458 {
 459        return _hypercall2(unsigned long, hvm_op, op, arg);
 460 }
 461
 462 static inline int
 463 HYPERVISOR_tmem_op(
 464         struct tmem_op *op)
 465 {
 466         return _hypercall1(int, tmem_op, op);
 467 }
 468
 469 static inline int
 470 HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
 471 {
 472         return _hypercall2(int, xenpmu_op, op, arg);
 473 }
 474
 475 static inline void
 476 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 477 {
 478         mcl->op = __HYPERVISOR_fpu_taskswitch;
 479         mcl->args[0] = set;
 480
 481         trace_xen_mc_entry(mcl, 1);
 482 }
 483
 484 static inline void
 485 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 486                         pte_t new_val, unsigned long flags)
 487 {
 488         mcl->op = __HYPERVISOR_update_va_mapping;
 489         mcl->args[0] = va;
 490         if (sizeof(new_val) == sizeof(long)) {
 491                 mcl->args[1] = new_val.pte;
 492                 mcl->args[2] = flags;
 493         } else {
 494                 mcl->args[1] = new_val.pte;
 495                 mcl->args[2] = new_val.pte >> 32;
 496                 mcl->args[3] = flags;
 497         }
 498
 499         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
 500 }
 501
 502 static inline void
 503 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 504                      void *uop, unsigned int count)
 505 {
 506         mcl->op = __HYPERVISOR_grant_table_op;
 507         mcl->args[0] = cmd;
 508         mcl->args[1] = (unsigned long)uop;
 509         mcl->args[2] = count;
 510
 511         trace_xen_mc_entry(mcl, 3);
 512 }
 513
 514 static inline void
 515 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 516                                     pte_t new_val, unsigned long flags,
 517                                     domid_t domid)
 518 {
 519         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 520         mcl->args[0] = va;
 521         if (sizeof(new_val) == sizeof(long)) {
 522                 mcl->args[1] = new_val.pte;
 523                 mcl->args[2] = flags;
 524                 mcl->args[3] = domid;
 525         } else {
 526                 mcl->args[1] = new_val.pte;
 527                 mcl->args[2] = new_val.pte >> 32;
 528                 mcl->args[3] = flags;
 529                 mcl->args[4] = domid;
 530         }
 531
 532         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
 533 }
 534
 535 static inline void
 536 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 537                         struct desc_struct desc)
 538 {
 539         mcl->op = __HYPERVISOR_update_descriptor;
 540         if (sizeof(maddr) == sizeof(long)) {
 541                 mcl->args[0] = maddr;
 542                 mcl->args[1] = *(unsigned long *)&desc;
 543         } else {
 544                 mcl->args[0] = maddr;
 545                 mcl->args[1] = maddr >> 32;
 546                 mcl->args[2] = desc.a;
 547                 mcl->args[3] = desc.b;
 548         }
 549
 550         trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
 551 }
 552
 553 static inline void
 554 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 555 {
 556         mcl->op = __HYPERVISOR_memory_op;
 557         mcl->args[0] = cmd;
 558         mcl->args[1] = (unsigned long)arg;
 559
 560         trace_xen_mc_entry(mcl, 2);
 561 }
 562
 563 static inline void
 564 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 565                  int count, int *success_count, domid_t domid)
 566 {
 567         mcl->op = __HYPERVISOR_mmu_update;
 568         mcl->args[0] = (unsigned long)req;
 569         mcl->args[1] = count;
 570         mcl->args[2] = (unsigned long)success_count;
 571         mcl->args[3] = domid;
 572
 573         trace_xen_mc_entry(mcl, 4);
 574 }
 575
 576 static inline void
 577 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 578                 int *success_count, domid_t domid)
 579 {
 580         mcl->op = __HYPERVISOR_mmuext_op;
 581         mcl->args[0] = (unsigned long)op;
 582         mcl->args[1] = count;
 583         mcl->args[2] = (unsigned long)success_count;
 584         mcl->args[3] = domid;
 585
 586         trace_xen_mc_entry(mcl, 4);
 587 }
 588
 589 static inline void
 590 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 591 {
 592         mcl->op = __HYPERVISOR_set_gdt;
 593         mcl->args[0] = (unsigned long)frames;
 594         mcl->args[1] = entries;
 595
 596         trace_xen_mc_entry(mcl, 2);
 597 }
 598
 599 static inline void
 600 MULTI_stack_switch(struct multicall_entry *mcl,
 601                    unsigned long ss, unsigned long esp)
 602 {
 603         mcl->op = __HYPERVISOR_stack_switch;
 604         mcl->args[0] = ss;
 605         mcl->args[1] = esp;
 606
 607         trace_xen_mc_entry(mcl, 2);
 608 }
 609
 610 #endif /* _ASM_X86_XEN_HYPERCALL_H */