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 #include <asm/smap.h>
  47 #include <asm/nospec-branch.h>
  48
  49 #include <xen/interface/xen.h>
  50 #include <xen/interface/sched.h>
  51 #include <xen/interface/physdev.h>
  52 #include <xen/interface/platform.h>
  53 #include <xen/interface/xen-mca.h>
  54
  55 /*
  56  * The hypercall asms have to meet several constraints:
  57  * - Work on 32- and 64-bit.
  58  *    The two architectures put their arguments in different sets of
  59  *    registers.
  60  *
  61  * - Work around asm syntax quirks
  62  *    It isn't possible to specify one of the rNN registers in a
  63  *    constraint, so we use explicit register variables to get the
  64  *    args into the right place.
  65  *
  66  * - Mark all registers as potentially clobbered
  67  *    Even unused parameters can be clobbered by the hypervisor, so we
  68  *    need to make sure gcc knows it.
  69  *
  70  * - Avoid compiler bugs.
  71  *    This is the tricky part.  Because x86_32 has such a constrained
  72  *    register set, gcc versions below 4.3 have trouble generating
  73  *    code when all the arg registers and memory are trashed by the
  74  *    asm.  There are syntactically simpler ways of achieving the
  75  *    semantics below, but they cause the compiler to crash.
  76  *
  77  *    The only combination I found which works is:
  78  *     - assign the __argX variables first
  79  *     - list all actually used parameters as "+r" (__argX)
  80  *     - clobber the rest
  81  *
  82  * The result certainly isn't pretty, and it really shows up cpp's
  83  * weakness as as macro language.  Sorry.  (But let's just give thanks
  84  * there aren't more than 5 arguments...)
  85  */
  86
  87 extern struct { char _entry[32]; } hypercall_page[];
  88
  89 #define __HYPERCALL             "call hypercall_page+%c[offset]"
  90 #define __HYPERCALL_ENTRY(x)                                            \
  91         [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
  92
  93 #ifdef CONFIG_X86_32
  94 #define __HYPERCALL_RETREG      "eax"
  95 #define __HYPERCALL_ARG1REG     "ebx"
  96 #define __HYPERCALL_ARG2REG     "ecx"
  97 #define __HYPERCALL_ARG3REG     "edx"
  98 #define __HYPERCALL_ARG4REG     "esi"
  99 #define __HYPERCALL_ARG5REG     "edi"
 100 #else
 101 #define __HYPERCALL_RETREG      "rax"
 102 #define __HYPERCALL_ARG1REG     "rdi"
 103 #define __HYPERCALL_ARG2REG     "rsi"
 104 #define __HYPERCALL_ARG3REG     "rdx"
 105 #define __HYPERCALL_ARG4REG     "r10"
 106 #define __HYPERCALL_ARG5REG     "r8"
 107 #endif
 108
 109 #define __HYPERCALL_DECLS                                               \
 110         register unsigned long __res  asm(__HYPERCALL_RETREG);          \
 111         register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
 112         register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
 113         register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
 114         register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
 115         register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5; \
 116         register void *__sp asm(_ASM_SP);
 117
 118 #define __HYPERCALL_0PARAM      "=r" (__res), "+r" (__sp)
 119 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
 120 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
 121 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
 122 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
 123 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
 124
 125 #define __HYPERCALL_0ARG()
 126 #define __HYPERCALL_1ARG(a1)                                            \
 127         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
 128 #define __HYPERCALL_2ARG(a1,a2)                                         \
 129         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
 130 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
 131         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
 132 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
 133         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
 134 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
 135         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
 136
 137 #define __HYPERCALL_CLOBBER5    "memory"
 138 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 139 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 140 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 141 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 142 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 143
 144 #define _hypercall0(type, name)                                         \
 145 ({                                                                      \
 146         __HYPERCALL_DECLS;                                              \
 147         __HYPERCALL_0ARG();                                             \
 148         asm volatile (__HYPERCALL                                       \
 149                       : __HYPERCALL_0PARAM                              \
 150                       : __HYPERCALL_ENTRY(name)                         \
 151                       : __HYPERCALL_CLOBBER0);                          \
 152         (type)__res;                                                    \
 153 })
 154
 155 #define _hypercall1(type, name, a1)                                     \
 156 ({                                                                      \
 157         __HYPERCALL_DECLS;                                              \
 158         __HYPERCALL_1ARG(a1);                                           \
 159         asm volatile (__HYPERCALL                                       \
 160                       : __HYPERCALL_1PARAM                              \
 161                       : __HYPERCALL_ENTRY(name)                         \
 162                       : __HYPERCALL_CLOBBER1);                          \
 163         (type)__res;                                                    \
 164 })
 165
 166 #define _hypercall2(type, name, a1, a2)                                 \
 167 ({                                                                      \
 168         __HYPERCALL_DECLS;                                              \
 169         __HYPERCALL_2ARG(a1, a2);                                       \
 170         asm volatile (__HYPERCALL                                       \
 171                       : __HYPERCALL_2PARAM                              \
 172                       : __HYPERCALL_ENTRY(name)                         \
 173                       : __HYPERCALL_CLOBBER2);                          \
 174         (type)__res;                                                    \
 175 })
 176
 177 #define _hypercall3(type, name, a1, a2, a3)                             \
 178 ({                                                                      \
 179         __HYPERCALL_DECLS;                                              \
 180         __HYPERCALL_3ARG(a1, a2, a3);                                   \
 181         asm volatile (__HYPERCALL                                       \
 182                       : __HYPERCALL_3PARAM                              \
 183                       : __HYPERCALL_ENTRY(name)                         \
 184                       : __HYPERCALL_CLOBBER3);                          \
 185         (type)__res;                                                    \
 186 })
 187
 188 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
 189 ({                                                                      \
 190         __HYPERCALL_DECLS;                                              \
 191         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 192         asm volatile (__HYPERCALL                                       \
 193                       : __HYPERCALL_4PARAM                              \
 194                       : __HYPERCALL_ENTRY(name)                         \
 195                       : __HYPERCALL_CLOBBER4);                          \
 196         (type)__res;                                                    \
 197 })
 198
 199 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 200 ({                                                                      \
 201         __HYPERCALL_DECLS;                                              \
 202         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 203         asm volatile (__HYPERCALL                                       \
 204                       : __HYPERCALL_5PARAM                              \
 205                       : __HYPERCALL_ENTRY(name)                         \
 206                       : __HYPERCALL_CLOBBER5);                          \
 207         (type)__res;                                                    \
 208 })
 209
 210 static inline long
 211 privcmd_call(unsigned call,
 212              unsigned long a1, unsigned long a2,
 213              unsigned long a3, unsigned long a4,
 214              unsigned long a5)
 215 {
 216         __HYPERCALL_DECLS;
 217         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 218
 219         if (call >= PAGE_SIZE / sizeof(hypercall_page[0]))
 220                 return -EINVAL;
 221
 222         stac();
 223         asm volatile(CALL_NOSPEC
 224                      : __HYPERCALL_5PARAM
 225                      : [thunk_target] "a" (&hypercall_page[call])
 226                      : __HYPERCALL_CLOBBER5);
 227         clac();
 228
 229         return (long)__res;
 230 }
 231
 232 static inline int
 233 HYPERVISOR_set_trap_table(struct trap_info *table)
 234 {
 235         return _hypercall1(int, set_trap_table, table);
 236 }
 237
 238 static inline int
 239 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 240                       int *success_count, domid_t domid)
 241 {
 242         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 243 }
 244
 245 static inline int
 246 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 247                      int *success_count, domid_t domid)
 248 {
 249         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 250 }
 251
 252 static inline int
 253 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 254 {
 255         return _hypercall2(int, set_gdt, frame_list, entries);
 256 }
 257
 258 static inline int
 259 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 260 {
 261         return _hypercall2(int, stack_switch, ss, esp);
 262 }
 263
 264 #ifdef CONFIG_X86_32
 265 static inline int
 266 HYPERVISOR_set_callbacks(unsigned long event_selector,
 267                          unsigned long event_address,
 268                          unsigned long failsafe_selector,
 269                          unsigned long failsafe_address)
 270 {
 271         return _hypercall4(int, set_callbacks,
 272                            event_selector, event_address,
 273                            failsafe_selector, failsafe_address);
 274 }
 275 #else  /* CONFIG_X86_64 */
 276 static inline int
 277 HYPERVISOR_set_callbacks(unsigned long event_address,
 278                         unsigned long failsafe_address,
 279                         unsigned long syscall_address)
 280 {
 281         return _hypercall3(int, set_callbacks,
 282                            event_address, failsafe_address,
 283                            syscall_address);
 284 }
 285 #endif  /* CONFIG_X86_{32,64} */
 286
 287 static inline int
 288 HYPERVISOR_callback_op(int cmd, void *arg)
 289 {
 290         return _hypercall2(int, callback_op, cmd, arg);
 291 }
 292
 293 static inline int
 294 HYPERVISOR_fpu_taskswitch(int set)
 295 {
 296         return _hypercall1(int, fpu_taskswitch, set);
 297 }
 298
 299 static inline int
 300 HYPERVISOR_sched_op(int cmd, void *arg)
 301 {
 302         return _hypercall2(int, sched_op, cmd, arg);
 303 }
 304
 305 static inline long
 306 HYPERVISOR_set_timer_op(u64 timeout)
 307 {
 308         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 309         unsigned long timeout_lo = (unsigned long)timeout;
 310         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 311 }
 312
 313 static inline int
 314 HYPERVISOR_mca(struct xen_mc *mc_op)
 315 {
 316         mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
 317         return _hypercall1(int, mca, mc_op);
 318 }
 319
 320 static inline int
 321 HYPERVISOR_platform_op(struct xen_platform_op *op)
 322 {
 323         op->interface_version = XENPF_INTERFACE_VERSION;
 324         return _hypercall1(int, platform_op, op);
 325 }
 326
 327 static inline int
 328 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 329 {
 330         return _hypercall2(int, set_debugreg, reg, value);
 331 }
 332
 333 static inline unsigned long
 334 HYPERVISOR_get_debugreg(int reg)
 335 {
 336         return _hypercall1(unsigned long, get_debugreg, reg);
 337 }
 338
 339 static inline int
 340 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 341 {
 342         if (sizeof(u64) == sizeof(long))
 343                 return _hypercall2(int, update_descriptor, ma, desc);
 344         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 345 }
 346
 347 static inline long
 348 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 349 {
 350         return _hypercall2(long, memory_op, cmd, arg);
 351 }
 352
 353 static inline int
 354 HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
 355 {
 356         return _hypercall2(int, multicall, call_list, nr_calls);
 357 }
 358
 359 static inline int
 360 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 361                              unsigned long flags)
 362 {
 363         if (sizeof(new_val) == sizeof(long))
 364                 return _hypercall3(int, update_va_mapping, va,
 365                                    new_val.pte, flags);
 366         else
 367                 return _hypercall4(int, update_va_mapping, va,
 368                                    new_val.pte, new_val.pte >> 32, flags);
 369 }
 370 extern int __must_check xen_event_channel_op_compat(int, void *);
 371
 372 static inline int
 373 HYPERVISOR_event_channel_op(int cmd, void *arg)
 374 {
 375         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 376         if (unlikely(rc == -ENOSYS))
 377                 rc = xen_event_channel_op_compat(cmd, arg);
 378         return rc;
 379 }
 380
 381 static inline int
 382 HYPERVISOR_xen_version(int cmd, void *arg)
 383 {
 384         return _hypercall2(int, xen_version, cmd, arg);
 385 }
 386
 387 static inline int
 388 HYPERVISOR_console_io(int cmd, int count, char *str)
 389 {
 390         return _hypercall3(int, console_io, cmd, count, str);
 391 }
 392
 393 extern int __must_check xen_physdev_op_compat(int, void *);
 394
 395 static inline int
 396 HYPERVISOR_physdev_op(int cmd, void *arg)
 397 {
 398         int rc = _hypercall2(int, physdev_op, cmd, arg);
 399         if (unlikely(rc == -ENOSYS))
 400                 rc = xen_physdev_op_compat(cmd, arg);
 401         return rc;
 402 }
 403
 404 static inline int
 405 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 406 {
 407         return _hypercall3(int, grant_table_op, cmd, uop, count);
 408 }
 409
 410 static inline int
 411 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 412                                          unsigned long flags, domid_t domid)
 413 {
 414         if (sizeof(new_val) == sizeof(long))
 415                 return _hypercall4(int, update_va_mapping_otherdomain, va,
 416                                    new_val.pte, flags, domid);
 417         else
 418                 return _hypercall5(int, update_va_mapping_otherdomain, va,
 419                                    new_val.pte, new_val.pte >> 32,
 420                                    flags, domid);
 421 }
 422
 423 static inline int
 424 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 425 {
 426         return _hypercall2(int, vm_assist, cmd, type);
 427 }
 428
 429 static inline int
 430 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 431 {
 432         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 433 }
 434
 435 #ifdef CONFIG_X86_64
 436 static inline int
 437 HYPERVISOR_set_segment_base(int reg, unsigned long value)
 438 {
 439         return _hypercall2(int, set_segment_base, reg, value);
 440 }
 441 #endif
 442
 443 static inline int
 444 HYPERVISOR_suspend(unsigned long start_info_mfn)
 445 {
 446         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
 447
 448         /*
 449          * For a PV guest the tools require that the start_info mfn be
 450          * present in rdx/edx when the hypercall is made. Per the
 451          * hypercall calling convention this is the third hypercall
 452          * argument, which is start_info_mfn here.
 453          */
 454         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
 455 }
 456
 457 static inline int
 458 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 459 {
 460         return _hypercall2(int, nmi_op, op, arg);
 461 }
 462
 463 static inline unsigned long __must_check
 464 HYPERVISOR_hvm_op(int op, void *arg)
 465 {
 466        return _hypercall2(unsigned long, hvm_op, op, arg);
 467 }
 468
 469 static inline int
 470 HYPERVISOR_tmem_op(
 471         struct tmem_op *op)
 472 {
 473         return _hypercall1(int, tmem_op, op);
 474 }
 475
 476 static inline int
 477 HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
 478 {
 479         return _hypercall2(int, xenpmu_op, op, arg);
 480 }
 481
 482 static inline void
 483 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 484 {
 485         mcl->op = __HYPERVISOR_fpu_taskswitch;
 486         mcl->args[0] = set;
 487
 488         trace_xen_mc_entry(mcl, 1);
 489 }
 490
 491 static inline void
 492 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 493                         pte_t new_val, unsigned long flags)
 494 {
 495         mcl->op = __HYPERVISOR_update_va_mapping;
 496         mcl->args[0] = va;
 497         if (sizeof(new_val) == sizeof(long)) {
 498                 mcl->args[1] = new_val.pte;
 499                 mcl->args[2] = flags;
 500         } else {
 501                 mcl->args[1] = new_val.pte;
 502                 mcl->args[2] = new_val.pte >> 32;
 503                 mcl->args[3] = flags;
 504         }
 505
 506         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
 507 }
 508
 509 static inline void
 510 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 511                      void *uop, unsigned int count)
 512 {
 513         mcl->op = __HYPERVISOR_grant_table_op;
 514         mcl->args[0] = cmd;
 515         mcl->args[1] = (unsigned long)uop;
 516         mcl->args[2] = count;
 517
 518         trace_xen_mc_entry(mcl, 3);
 519 }
 520
 521 static inline void
 522 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 523                                     pte_t new_val, unsigned long flags,
 524                                     domid_t domid)
 525 {
 526         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 527         mcl->args[0] = va;
 528         if (sizeof(new_val) == sizeof(long)) {
 529                 mcl->args[1] = new_val.pte;
 530                 mcl->args[2] = flags;
 531                 mcl->args[3] = domid;
 532         } else {
 533                 mcl->args[1] = new_val.pte;
 534                 mcl->args[2] = new_val.pte >> 32;
 535                 mcl->args[3] = flags;
 536                 mcl->args[4] = domid;
 537         }
 538
 539         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
 540 }
 541
 542 static inline void
 543 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 544                         struct desc_struct desc)
 545 {
 546         mcl->op = __HYPERVISOR_update_descriptor;
 547         if (sizeof(maddr) == sizeof(long)) {
 548                 mcl->args[0] = maddr;
 549                 mcl->args[1] = *(unsigned long *)&desc;
 550         } else {
 551                 mcl->args[0] = maddr;
 552                 mcl->args[1] = maddr >> 32;
 553                 mcl->args[2] = desc.a;
 554                 mcl->args[3] = desc.b;
 555         }
 556
 557         trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
 558 }
 559
 560 static inline void
 561 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 562 {
 563         mcl->op = __HYPERVISOR_memory_op;
 564         mcl->args[0] = cmd;
 565         mcl->args[1] = (unsigned long)arg;
 566
 567         trace_xen_mc_entry(mcl, 2);
 568 }
 569
 570 static inline void
 571 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 572                  int count, int *success_count, domid_t domid)
 573 {
 574         mcl->op = __HYPERVISOR_mmu_update;
 575         mcl->args[0] = (unsigned long)req;
 576         mcl->args[1] = count;
 577         mcl->args[2] = (unsigned long)success_count;
 578         mcl->args[3] = domid;
 579
 580         trace_xen_mc_entry(mcl, 4);
 581 }
 582
 583 static inline void
 584 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 585                 int *success_count, domid_t domid)
 586 {
 587         mcl->op = __HYPERVISOR_mmuext_op;
 588         mcl->args[0] = (unsigned long)op;
 589         mcl->args[1] = count;
 590         mcl->args[2] = (unsigned long)success_count;
 591         mcl->args[3] = domid;
 592
 593         trace_xen_mc_entry(mcl, 4);
 594 }
 595
 596 static inline void
 597 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 598 {
 599         mcl->op = __HYPERVISOR_set_gdt;
 600         mcl->args[0] = (unsigned long)frames;
 601         mcl->args[1] = entries;
 602
 603         trace_xen_mc_entry(mcl, 2);
 604 }
 605
 606 static inline void
 607 MULTI_stack_switch(struct multicall_entry *mcl,
 608                    unsigned long ss, unsigned long esp)
 609 {
 610         mcl->op = __HYPERVISOR_stack_switch;
 611         mcl->args[0] = ss;
 612         mcl->args[1] = esp;
 613
 614         trace_xen_mc_entry(mcl, 2);
 615 }
 616
 617 #endif /* _ASM_X86_XEN_HYPERCALL_H */