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
 117 #define __HYPERCALL_0PARAM      "=r" (__res)
 118 #define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
 119 #define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
 120 #define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
 121 #define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
 122 #define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
 123
 124 #define __HYPERCALL_0ARG()
 125 #define __HYPERCALL_1ARG(a1)                                            \
 126         __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
 127 #define __HYPERCALL_2ARG(a1,a2)                                         \
 128         __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
 129 #define __HYPERCALL_3ARG(a1,a2,a3)                                      \
 130         __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
 131 #define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
 132         __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
 133 #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
 134         __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
 135
 136 #define __HYPERCALL_CLOBBER5    "memory"
 137 #define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 138 #define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 139 #define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 140 #define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 141 #define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 142
 143 #define _hypercall0(type, name)                                         \
 144 ({                                                                      \
 145         __HYPERCALL_DECLS;                                              \
 146         __HYPERCALL_0ARG();                                             \
 147         asm volatile (__HYPERCALL                                       \
 148                       : __HYPERCALL_0PARAM                              \
 149                       : __HYPERCALL_ENTRY(name)                         \
 150                       : __HYPERCALL_CLOBBER0);                          \
 151         (type)__res;                                                    \
 152 })
 153
 154 #define _hypercall1(type, name, a1)                                     \
 155 ({                                                                      \
 156         __HYPERCALL_DECLS;                                              \
 157         __HYPERCALL_1ARG(a1);                                           \
 158         asm volatile (__HYPERCALL                                       \
 159                       : __HYPERCALL_1PARAM                              \
 160                       : __HYPERCALL_ENTRY(name)                         \
 161                       : __HYPERCALL_CLOBBER1);                          \
 162         (type)__res;                                                    \
 163 })
 164
 165 #define _hypercall2(type, name, a1, a2)                                 \
 166 ({                                                                      \
 167         __HYPERCALL_DECLS;                                              \
 168         __HYPERCALL_2ARG(a1, a2);                                       \
 169         asm volatile (__HYPERCALL                                       \
 170                       : __HYPERCALL_2PARAM                              \
 171                       : __HYPERCALL_ENTRY(name)                         \
 172                       : __HYPERCALL_CLOBBER2);                          \
 173         (type)__res;                                                    \
 174 })
 175
 176 #define _hypercall3(type, name, a1, a2, a3)                             \
 177 ({                                                                      \
 178         __HYPERCALL_DECLS;                                              \
 179         __HYPERCALL_3ARG(a1, a2, a3);                                   \
 180         asm volatile (__HYPERCALL                                       \
 181                       : __HYPERCALL_3PARAM                              \
 182                       : __HYPERCALL_ENTRY(name)                         \
 183                       : __HYPERCALL_CLOBBER3);                          \
 184         (type)__res;                                                    \
 185 })
 186
 187 #define _hypercall4(type, name, a1, a2, a3, a4)                         \
 188 ({                                                                      \
 189         __HYPERCALL_DECLS;                                              \
 190         __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 191         asm volatile (__HYPERCALL                                       \
 192                       : __HYPERCALL_4PARAM                              \
 193                       : __HYPERCALL_ENTRY(name)                         \
 194                       : __HYPERCALL_CLOBBER4);                          \
 195         (type)__res;                                                    \
 196 })
 197
 198 #define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 199 ({                                                                      \
 200         __HYPERCALL_DECLS;                                              \
 201         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 202         asm volatile (__HYPERCALL                                       \
 203                       : __HYPERCALL_5PARAM                              \
 204                       : __HYPERCALL_ENTRY(name)                         \
 205                       : __HYPERCALL_CLOBBER5);                          \
 206         (type)__res;                                                    \
 207 })
 208
 209 static inline long
 210 privcmd_call(unsigned call,
 211              unsigned long a1, unsigned long a2,
 212              unsigned long a3, unsigned long a4,
 213              unsigned long a5)
 214 {
 215         __HYPERCALL_DECLS;
 216         __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 217
 218         if (call >= PAGE_SIZE / sizeof(hypercall_page[0]))
 219                 return -EINVAL;
 220
 221         stac();
 222         asm volatile(CALL_NOSPEC
 223                      : __HYPERCALL_5PARAM
 224                      : [thunk_target] "a" (&hypercall_page[call])
 225                      : __HYPERCALL_CLOBBER5);
 226         clac();
 227
 228         return (long)__res;
 229 }
 230
 231 static inline int
 232 HYPERVISOR_set_trap_table(struct trap_info *table)
 233 {
 234         return _hypercall1(int, set_trap_table, table);
 235 }
 236
 237 static inline int
 238 HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 239                       int *success_count, domid_t domid)
 240 {
 241         return _hypercall4(int, mmu_update, req, count, success_count, domid);
 242 }
 243
 244 static inline int
 245 HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 246                      int *success_count, domid_t domid)
 247 {
 248         return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 249 }
 250
 251 static inline int
 252 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 253 {
 254         return _hypercall2(int, set_gdt, frame_list, entries);
 255 }
 256
 257 static inline int
 258 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 259 {
 260         return _hypercall2(int, stack_switch, ss, esp);
 261 }
 262
 263 #ifdef CONFIG_X86_32
 264 static inline int
 265 HYPERVISOR_set_callbacks(unsigned long event_selector,
 266                          unsigned long event_address,
 267                          unsigned long failsafe_selector,
 268                          unsigned long failsafe_address)
 269 {
 270         return _hypercall4(int, set_callbacks,
 271                            event_selector, event_address,
 272                            failsafe_selector, failsafe_address);
 273 }
 274 #else  /* CONFIG_X86_64 */
 275 static inline int
 276 HYPERVISOR_set_callbacks(unsigned long event_address,
 277                         unsigned long failsafe_address,
 278                         unsigned long syscall_address)
 279 {
 280         return _hypercall3(int, set_callbacks,
 281                            event_address, failsafe_address,
 282                            syscall_address);
 283 }
 284 #endif  /* CONFIG_X86_{32,64} */
 285
 286 static inline int
 287 HYPERVISOR_callback_op(int cmd, void *arg)
 288 {
 289         return _hypercall2(int, callback_op, cmd, arg);
 290 }
 291
 292 static inline int
 293 HYPERVISOR_fpu_taskswitch(int set)
 294 {
 295         return _hypercall1(int, fpu_taskswitch, set);
 296 }
 297
 298 static inline int
 299 HYPERVISOR_sched_op(int cmd, void *arg)
 300 {
 301         return _hypercall2(int, sched_op, cmd, arg);
 302 }
 303
 304 static inline long
 305 HYPERVISOR_set_timer_op(u64 timeout)
 306 {
 307         unsigned long timeout_hi = (unsigned long)(timeout>>32);
 308         unsigned long timeout_lo = (unsigned long)timeout;
 309         return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 310 }
 311
 312 static inline int
 313 HYPERVISOR_mca(struct xen_mc *mc_op)
 314 {
 315         mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
 316         return _hypercall1(int, mca, mc_op);
 317 }
 318
 319 static inline int
 320 HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
 321 {
 322         platform_op->interface_version = XENPF_INTERFACE_VERSION;
 323         return _hypercall1(int, dom0_op, platform_op);
 324 }
 325
 326 static inline int
 327 HYPERVISOR_set_debugreg(int reg, unsigned long value)
 328 {
 329         return _hypercall2(int, set_debugreg, reg, value);
 330 }
 331
 332 static inline unsigned long
 333 HYPERVISOR_get_debugreg(int reg)
 334 {
 335         return _hypercall1(unsigned long, get_debugreg, reg);
 336 }
 337
 338 static inline int
 339 HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 340 {
 341         if (sizeof(u64) == sizeof(long))
 342                 return _hypercall2(int, update_descriptor, ma, desc);
 343         return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 344 }
 345
 346 static inline long
 347 HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 348 {
 349         return _hypercall2(long, memory_op, cmd, arg);
 350 }
 351
 352 static inline int
 353 HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
 354 {
 355         return _hypercall2(int, multicall, call_list, nr_calls);
 356 }
 357
 358 static inline int
 359 HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 360                              unsigned long flags)
 361 {
 362         if (sizeof(new_val) == sizeof(long))
 363                 return _hypercall3(int, update_va_mapping, va,
 364                                    new_val.pte, flags);
 365         else
 366                 return _hypercall4(int, update_va_mapping, va,
 367                                    new_val.pte, new_val.pte >> 32, flags);
 368 }
 369 extern int __must_check xen_event_channel_op_compat(int, void *);
 370
 371 static inline int
 372 HYPERVISOR_event_channel_op(int cmd, void *arg)
 373 {
 374         int rc = _hypercall2(int, event_channel_op, cmd, arg);
 375         if (unlikely(rc == -ENOSYS))
 376                 rc = xen_event_channel_op_compat(cmd, arg);
 377         return rc;
 378 }
 379
 380 static inline int
 381 HYPERVISOR_xen_version(int cmd, void *arg)
 382 {
 383         return _hypercall2(int, xen_version, cmd, arg);
 384 }
 385
 386 static inline int
 387 HYPERVISOR_console_io(int cmd, int count, char *str)
 388 {
 389         return _hypercall3(int, console_io, cmd, count, str);
 390 }
 391
 392 extern int __must_check xen_physdev_op_compat(int, void *);
 393
 394 static inline int
 395 HYPERVISOR_physdev_op(int cmd, void *arg)
 396 {
 397         int rc = _hypercall2(int, physdev_op, cmd, arg);
 398         if (unlikely(rc == -ENOSYS))
 399                 rc = xen_physdev_op_compat(cmd, arg);
 400         return rc;
 401 }
 402
 403 static inline int
 404 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 405 {
 406         return _hypercall3(int, grant_table_op, cmd, uop, count);
 407 }
 408
 409 static inline int
 410 HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 411                                          unsigned long flags, domid_t domid)
 412 {
 413         if (sizeof(new_val) == sizeof(long))
 414                 return _hypercall4(int, update_va_mapping_otherdomain, va,
 415                                    new_val.pte, flags, domid);
 416         else
 417                 return _hypercall5(int, update_va_mapping_otherdomain, va,
 418                                    new_val.pte, new_val.pte >> 32,
 419                                    flags, domid);
 420 }
 421
 422 static inline int
 423 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 424 {
 425         return _hypercall2(int, vm_assist, cmd, type);
 426 }
 427
 428 static inline int
 429 HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 430 {
 431         return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 432 }
 433
 434 #ifdef CONFIG_X86_64
 435 static inline int
 436 HYPERVISOR_set_segment_base(int reg, unsigned long value)
 437 {
 438         return _hypercall2(int, set_segment_base, reg, value);
 439 }
 440 #endif
 441
 442 static inline int
 443 HYPERVISOR_suspend(unsigned long start_info_mfn)
 444 {
 445         struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
 446
 447         /*
 448          * For a PV guest the tools require that the start_info mfn be
 449          * present in rdx/edx when the hypercall is made. Per the
 450          * hypercall calling convention this is the third hypercall
 451          * argument, which is start_info_mfn here.
 452          */
 453         return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
 454 }
 455
 456 static inline int
 457 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 458 {
 459         return _hypercall2(int, nmi_op, op, arg);
 460 }
 461
 462 static inline unsigned long __must_check
 463 HYPERVISOR_hvm_op(int op, void *arg)
 464 {
 465        return _hypercall2(unsigned long, hvm_op, op, arg);
 466 }
 467
 468 static inline int
 469 HYPERVISOR_tmem_op(
 470         struct tmem_op *op)
 471 {
 472         return _hypercall1(int, tmem_op, op);
 473 }
 474
 475 static inline int
 476 HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
 477 {
 478         return _hypercall2(int, xenpmu_op, op, arg);
 479 }
 480
 481 static inline void
 482 MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 483 {
 484         mcl->op = __HYPERVISOR_fpu_taskswitch;
 485         mcl->args[0] = set;
 486
 487         trace_xen_mc_entry(mcl, 1);
 488 }
 489
 490 static inline void
 491 MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 492                         pte_t new_val, unsigned long flags)
 493 {
 494         mcl->op = __HYPERVISOR_update_va_mapping;
 495         mcl->args[0] = va;
 496         if (sizeof(new_val) == sizeof(long)) {
 497                 mcl->args[1] = new_val.pte;
 498                 mcl->args[2] = flags;
 499         } else {
 500                 mcl->args[1] = new_val.pte;
 501                 mcl->args[2] = new_val.pte >> 32;
 502                 mcl->args[3] = flags;
 503         }
 504
 505         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
 506 }
 507
 508 static inline void
 509 MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 510                      void *uop, unsigned int count)
 511 {
 512         mcl->op = __HYPERVISOR_grant_table_op;
 513         mcl->args[0] = cmd;
 514         mcl->args[1] = (unsigned long)uop;
 515         mcl->args[2] = count;
 516
 517         trace_xen_mc_entry(mcl, 3);
 518 }
 519
 520 static inline void
 521 MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 522                                     pte_t new_val, unsigned long flags,
 523                                     domid_t domid)
 524 {
 525         mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 526         mcl->args[0] = va;
 527         if (sizeof(new_val) == sizeof(long)) {
 528                 mcl->args[1] = new_val.pte;
 529                 mcl->args[2] = flags;
 530                 mcl->args[3] = domid;
 531         } else {
 532                 mcl->args[1] = new_val.pte;
 533                 mcl->args[2] = new_val.pte >> 32;
 534                 mcl->args[3] = flags;
 535                 mcl->args[4] = domid;
 536         }
 537
 538         trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
 539 }
 540
 541 static inline void
 542 MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 543                         struct desc_struct desc)
 544 {
 545         mcl->op = __HYPERVISOR_update_descriptor;
 546         if (sizeof(maddr) == sizeof(long)) {
 547                 mcl->args[0] = maddr;
 548                 mcl->args[1] = *(unsigned long *)&desc;
 549         } else {
 550                 mcl->args[0] = maddr;
 551                 mcl->args[1] = maddr >> 32;
 552                 mcl->args[2] = desc.a;
 553                 mcl->args[3] = desc.b;
 554         }
 555
 556         trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
 557 }
 558
 559 static inline void
 560 MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 561 {
 562         mcl->op = __HYPERVISOR_memory_op;
 563         mcl->args[0] = cmd;
 564         mcl->args[1] = (unsigned long)arg;
 565
 566         trace_xen_mc_entry(mcl, 2);
 567 }
 568
 569 static inline void
 570 MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 571                  int count, int *success_count, domid_t domid)
 572 {
 573         mcl->op = __HYPERVISOR_mmu_update;
 574         mcl->args[0] = (unsigned long)req;
 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_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 584                 int *success_count, domid_t domid)
 585 {
 586         mcl->op = __HYPERVISOR_mmuext_op;
 587         mcl->args[0] = (unsigned long)op;
 588         mcl->args[1] = count;
 589         mcl->args[2] = (unsigned long)success_count;
 590         mcl->args[3] = domid;
 591
 592         trace_xen_mc_entry(mcl, 4);
 593 }
 594
 595 static inline void
 596 MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 597 {
 598         mcl->op = __HYPERVISOR_set_gdt;
 599         mcl->args[0] = (unsigned long)frames;
 600         mcl->args[1] = entries;
 601
 602         trace_xen_mc_entry(mcl, 2);
 603 }
 604
 605 static inline void
 606 MULTI_stack_switch(struct multicall_entry *mcl,
 607                    unsigned long ss, unsigned long esp)
 608 {
 609         mcl->op = __HYPERVISOR_stack_switch;
 610         mcl->args[0] = ss;
 611         mcl->args[1] = esp;
 612
 613         trace_xen_mc_entry(mcl, 2);
 614 }
 615
 616 #endif /* _ASM_X86_XEN_HYPERCALL_H */