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
 115 #define __HYPERCALL_0PARAM      "=r" (__res)
 116 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
 117 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
 118 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
 119 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
 120 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
 121
 122 #define __HYPERCALL_0ARG()
 123 #define __HYPERCALL_1ARG(a1)                                            \
 124         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
 125 #define __HYPERCALL_2ARG(a1,a2)                                         \
 126         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
 127 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
 128         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
 129 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
 130         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
 131 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
 132         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
 133
 134 #define __HYPERCALL_CLOBBER5    "memory"
 135 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 136 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 137 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 138 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 139 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 140
 141 #define _hypercall0(type, name)                                         \
 142 ({                                                                      \
 143         __HYPERCALL_DECLS;                                              \
 144         __HYPERCALL_0ARG();                                             \
 145         asm volatile (__HYPERCALL                                       \
 146                       : __HYPERCALL_0PARAM                              \
 147                       : __HYPERCALL_ENTRY(name)                         \
 148                       : __HYPERCALL_CLOBBER0);                          \
 149         (type)__res;                                                    \
 150 })
 151
 152 #define _hypercall1(type, name, a1)                                     \
 153 ({                                                                      \
 154         __HYPERCALL_DECLS;                                              \
 155         __HYPERCALL_1ARG(a1);                                           \
 156         asm volatile (__HYPERCALL                                       \
 157                       : __HYPERCALL_1PARAM                              \
 158                       : __HYPERCALL_ENTRY(name)                         \
 159                       : __HYPERCALL_CLOBBER1);                          \
 160         (type)__res;                                                    \
 161 })
 162
 163 #define _hypercall2(type, name, a1, a2)                                 \
 164 ({                                                                      \
 165         __HYPERCALL_DECLS;                                              \
 166         __HYPERCALL_2ARG(a1, a2);                                       \
 167         asm volatile (__HYPERCALL                                       \
 168                       : __HYPERCALL_2PARAM                              \
 169                       : __HYPERCALL_ENTRY(name)                         \
 170                       : __HYPERCALL_CLOBBER2);                          \
 171         (type)__res;                                                    \
 172 })
 173
 174 #define _hypercall3(type, name, a1, a2, a3)                             \
 175 ({                                                                      \
 176         __HYPERCALL_DECLS;                                              \
 177         __HYPERCALL_3ARG(a1, a2, a3);                                   \
 178         asm volatile (__HYPERCALL                                       \
 179                       : __HYPERCALL_3PARAM                              \
 180                       : __HYPERCALL_ENTRY(name)                         \
 181                       : __HYPERCALL_CLOBBER3);                          \
 182         (type)__res;                                                    \
 183 })
 184
 185 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
 186 ({                                                                      \
 187         __HYPERCALL_DECLS;                                              \
 188         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 189         asm volatile (__HYPERCALL                                       \
 190                       : __HYPERCALL_4PARAM                              \
 191                       : __HYPERCALL_ENTRY(name)                         \
 192                       : __HYPERCALL_CLOBBER4);                          \
 193         (type)__res;                                                    \
 194 })
 195
 196 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 197 ({                                                                      \
 198         __HYPERCALL_DECLS;                                              \
 199         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 200         asm volatile (__HYPERCALL                                       \
 201                       : __HYPERCALL_5PARAM                              \
 202                       : __HYPERCALL_ENTRY(name)                         \
 203                       : __HYPERCALL_CLOBBER5);                          \
 204         (type)__res;                                                    \
 205 })
 206
 207 static inline long
 208 privcmd_call(unsigned call,
 209              unsigned long a1, unsigned long a2,
 210              unsigned long a3, unsigned long a4,
 211              unsigned long a5)
 212 {
 213         __HYPERCALL_DECLS;
 214         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 215
 216         asm volatile("call *%[call]"
 217                      : __HYPERCALL_5PARAM
 218                      : [call] "a" (&hypercall_page[call])
 219                      : __HYPERCALL_CLOBBER5);
 220
 221         return (long)__res;
 222 }
 223
 224 static inline int
 225 HYPERVISOR_set_trap_table(struct trap_info *table)
 226 {
 227         return _hypercall1(int, set_trap_table, table);
 228 }
 229
 230 static inline int
 231 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 232                       int *success_count, domid_t domid)
 233 {
 234         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 235 }
 236
 237 static inline int
 238 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 239                      int *success_count, domid_t domid)
 240 {
 241         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 242 }
 243
 244 static inline int
 245 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 246 {
 247         return _hypercall2(int, set_gdt, frame_list, entries);
 248 }
 249
 250 static inline int
 251 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 252 {
 253         return _hypercall2(int, stack_switch, ss, esp);
 254 }
 255
 256 #ifdef CONFIG_X86_32
 257 static inline int
 258 HYPERVISOR_set_callbacks(unsigned long event_selector,
 259                          unsigned long event_address,
 260                          unsigned long failsafe_selector,
 261                          unsigned long failsafe_address)
 262 {
 263         return _hypercall4(int, set_callbacks,
 264                            event_selector, event_address,
 265                            failsafe_selector, failsafe_address);
 266 }
 267 #else  /* CONFIG_X86_64 */
 268 static inline int
 269 HYPERVISOR_set_callbacks(unsigned long event_address,
 270                         unsigned long failsafe_address,
 271                         unsigned long syscall_address)
 272 {
 273         return _hypercall3(int, set_callbacks,
 274                            event_address, failsafe_address,
 275                            syscall_address);
 276 }
 277 #endif  /* CONFIG_X86_{32,64} */
 278
 279 static inline int
 280 HYPERVISOR_callback_op(int cmd, void *arg)
 281 {
 282         return _hypercall2(int, callback_op, cmd, arg);
 283 }
 284
 285 static inline int
 286 HYPERVISOR_fpu_taskswitch(int set)
 287 {
 288         return _hypercall1(int, fpu_taskswitch, set);
 289 }
 290
 291 static inline int
 292 HYPERVISOR_sched_op(int cmd, void *arg)
 293 {
 294         return _hypercall2(int, sched_op, cmd, arg);
 295 }
 296
 297 static inline long
 298 HYPERVISOR_set_timer_op(u64 timeout)
 299 {
 300         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 301         unsigned long timeout_lo = (unsigned long)timeout;
 302         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 303 }
 304
 305 static inline int
 306 HYPERVISOR_mca(struct xen_mc *mc_op)
 307 {
 308         mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
 309         return _hypercall1(int, mca, mc_op);
 310 }
 311
 312 static inline int
 313 HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
 314 {
 315         platform_op->interface_version = XENPF_INTERFACE_VERSION;
 316         return _hypercall1(int, dom0_op, platform_op);
 317 }
 318
 319 static inline int
 320 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 321 {
 322         return _hypercall2(int, set_debugreg, reg, value);
 323 }
 324
 325 static inline unsigned long
 326 HYPERVISOR_get_debugreg(int reg)
 327 {
 328         return _hypercall1(unsigned long, get_debugreg, reg);
 329 }
 330
 331 static inline int
 332 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 333 {
 334         if (sizeof(u64) == sizeof(long))
 335                 return _hypercall2(int, update_descriptor, ma, desc);
 336         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 337 }
 338
 339 static inline int
 340 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 341 {
 342         return _hypercall2(int, memory_op, cmd, arg);
 343 }
 344
 345 static inline int
 346 HYPERVISOR_multicall(void *call_list, int nr_calls)
 347 {
 348         return _hypercall2(int, multicall, call_list, nr_calls);
 349 }
 350
 351 static inline int
 352 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 353                              unsigned long flags)
 354 {
 355         if (sizeof(new_val) == sizeof(long))
 356                 return _hypercall3(int, update_va_mapping, va,
 357                                    new_val.pte, flags);
 358         else
 359                 return _hypercall4(int, update_va_mapping, va,
 360                                    new_val.pte, new_val.pte >> 32, flags);
 361 }
 362 extern int __must_check xen_event_channel_op_compat(int, void *);
 363
 364 static inline int
 365 HYPERVISOR_event_channel_op(int cmd, void *arg)
 366 {
 367         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 368         if (unlikely(rc == -ENOSYS))
 369                 rc = xen_event_channel_op_compat(cmd, arg);
 370         return rc;
 371 }
 372
 373 static inline int
 374 HYPERVISOR_xen_version(int cmd, void *arg)
 375 {
 376         return _hypercall2(int, xen_version, cmd, arg);
 377 }
 378
 379 static inline int
 380 HYPERVISOR_console_io(int cmd, int count, char *str)
 381 {
 382         return _hypercall3(int, console_io, cmd, count, str);
 383 }
 384
 385 extern int __must_check HYPERVISOR_physdev_op_compat(int, void *);
 386
 387 static inline int
 388 HYPERVISOR_physdev_op(int cmd, void *arg)
 389 {
 390         int rc = _hypercall2(int, physdev_op, cmd, arg);
 391         if (unlikely(rc == -ENOSYS))
 392                 rc = HYPERVISOR_physdev_op_compat(cmd, arg);
 393         return rc;
 394 }
 395
 396 static inline int
 397 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 398 {
 399         return _hypercall3(int, grant_table_op, cmd, uop, count);
 400 }
 401
 402 static inline int
 403 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 404                                          unsigned long flags, domid_t domid)
 405 {
 406         if (sizeof(new_val) == sizeof(long))
 407                 return _hypercall4(int, update_va_mapping_otherdomain, va,
 408                                    new_val.pte, flags, domid);
 409         else
 410                 return _hypercall5(int, update_va_mapping_otherdomain, va,
 411                                    new_val.pte, new_val.pte >> 32,
 412                                    flags, domid);
 413 }
 414
 415 static inline int
 416 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 417 {
 418         return _hypercall2(int, vm_assist, cmd, type);
 419 }
 420
 421 static inline int
 422 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 423 {
 424         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 425 }
 426
 427 #ifdef CONFIG_X86_64
 428 static inline int
 429 HYPERVISOR_set_segment_base(int reg, unsigned long value)
 430 {
 431         return _hypercall2(int, set_segment_base, reg, value);
 432 }
 433 #endif
 434
 435 static inline int
 436 HYPERVISOR_suspend(unsigned long start_info_mfn)
 437 {
 438         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
 439
 440         /*
 441          * For a PV guest the tools require that the start_info mfn be
 442          * present in rdx/edx when the hypercall is made. Per the
 443          * hypercall calling convention this is the third hypercall
 444          * argument, which is start_info_mfn here.
 445          */
 446         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
 447 }
 448
 449 static inline int
 450 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 451 {
 452         return _hypercall2(int, nmi_op, op, arg);
 453 }
 454
 455 static inline unsigned long __must_check
 456 HYPERVISOR_hvm_op(int op, void *arg)
 457 {
 458        return _hypercall2(unsigned long, hvm_op, op, arg);
 459 }
 460
 461 static inline int
 462 HYPERVISOR_tmem_op(
 463         struct tmem_op *op)
 464 {
 465         return _hypercall1(int, tmem_op, op);
 466 }
 467
 468 static inline void
 469 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 470 {
 471         mcl->op = __HYPERVISOR_fpu_taskswitch;
 472         mcl->args[0] = set;
 473
 474         trace_xen_mc_entry(mcl, 1);
 475 }
 476
 477 static inline void
 478 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 479                         pte_t new_val, unsigned long flags)
 480 {
 481         mcl->op = __HYPERVISOR_update_va_mapping;
 482         mcl->args[0] = va;
 483         if (sizeof(new_val) == sizeof(long)) {
 484                 mcl->args[1] = new_val.pte;
 485                 mcl->args[2] = flags;
 486         } else {
 487                 mcl->args[1] = new_val.pte;
 488                 mcl->args[2] = new_val.pte >> 32;
 489                 mcl->args[3] = flags;
 490         }
 491
 492         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
 493 }
 494
 495 static inline void
 496 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 497                      void *uop, unsigned int count)
 498 {
 499         mcl->op = __HYPERVISOR_grant_table_op;
 500         mcl->args[0] = cmd;
 501         mcl->args[1] = (unsigned long)uop;
 502         mcl->args[2] = count;
 503
 504         trace_xen_mc_entry(mcl, 3);
 505 }
 506
 507 static inline void
 508 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 509                                     pte_t new_val, unsigned long flags,
 510                                     domid_t domid)
 511 {
 512         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 513         mcl->args[0] = va;
 514         if (sizeof(new_val) == sizeof(long)) {
 515                 mcl->args[1] = new_val.pte;
 516                 mcl->args[2] = flags;
 517                 mcl->args[3] = domid;
 518         } else {
 519                 mcl->args[1] = new_val.pte;
 520                 mcl->args[2] = new_val.pte >> 32;
 521                 mcl->args[3] = flags;
 522                 mcl->args[4] = domid;
 523         }
 524
 525         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
 526 }
 527
 528 static inline void
 529 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 530                         struct desc_struct desc)
 531 {
 532         mcl->op = __HYPERVISOR_update_descriptor;
 533         if (sizeof(maddr) == sizeof(long)) {
 534                 mcl->args[0] = maddr;
 535                 mcl->args[1] = *(unsigned long *)&desc;
 536         } else {
 537                 mcl->args[0] = maddr;
 538                 mcl->args[1] = maddr >> 32;
 539                 mcl->args[2] = desc.a;
 540                 mcl->args[3] = desc.b;
 541         }
 542
 543         trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
 544 }
 545
 546 static inline void
 547 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 548 {
 549         mcl->op = __HYPERVISOR_memory_op;
 550         mcl->args[0] = cmd;
 551         mcl->args[1] = (unsigned long)arg;
 552
 553         trace_xen_mc_entry(mcl, 2);
 554 }
 555
 556 static inline void
 557 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 558                  int count, int *success_count, domid_t domid)
 559 {
 560         mcl->op = __HYPERVISOR_mmu_update;
 561         mcl->args[0] = (unsigned long)req;
 562         mcl->args[1] = count;
 563         mcl->args[2] = (unsigned long)success_count;
 564         mcl->args[3] = domid;
 565
 566         trace_xen_mc_entry(mcl, 4);
 567 }
 568
 569 static inline void
 570 MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 571                 int *success_count, domid_t domid)
 572 {
 573         mcl->op = __HYPERVISOR_mmuext_op;
 574         mcl->args[0] = (unsigned long)op;
 575         mcl->args[1] = count;
 576         mcl->args[2] = (unsigned long)success_count;
 577         mcl->args[3] = domid;
 578
 579         trace_xen_mc_entry(mcl, 4);
 580 }
 581
 582 static inline void
 583 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 584 {
 585         mcl->op = __HYPERVISOR_set_gdt;
 586         mcl->args[0] = (unsigned long)frames;
 587         mcl->args[1] = entries;
 588
 589         trace_xen_mc_entry(mcl, 2);
 590 }
 591
 592 static inline void
 593 MULTI_stack_switch(struct multicall_entry *mcl,
 594                    unsigned long ss, unsigned long esp)
 595 {
 596         mcl->op = __HYPERVISOR_stack_switch;
 597         mcl->args[0] = ss;
 598         mcl->args[1] = esp;
 599
 600         trace_xen_mc_entry(mcl, 2);
 601 }
 602
 603 #endif /* _ASM_X86_XEN_HYPERCALL_H */