LXR linux/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
  55struct xen_dm_op_buf;
  56
  57/*
  58 * The hypercall asms have to meet several constraints:
  59 * - Work on 32- and 64-bit.
  60 *    The two architectures put their arguments in different sets of
  61 *    registers.
  62 *
  63 * - Work around asm syntax quirks
  64 *    It isn't possible to specify one of the rNN registers in a
  65 *    constraint, so we use explicit register variables to get the
  66 *    args into the right place.
  67 *
  68 * - Mark all registers as potentially clobbered
  69 *    Even unused parameters can be clobbered by the hypervisor, so we
  70 *    need to make sure gcc knows it.
  71 *
  72 * - Avoid compiler bugs.
  73 *    This is the tricky part.  Because x86_32 has such a constrained
  74 *    register set, gcc versions below 4.3 have trouble generating
  75 *    code when all the arg registers and memory are trashed by the
  76 *    asm.  There are syntactically simpler ways of achieving the
  77 *    semantics below, but they cause the compiler to crash.
  78 *
  79 *    The only combination I found which works is:
  80 *     - assign the __argX variables first
  81 *     - list all actually used parameters as "+r" (__argX)
  82 *     - clobber the rest
  83 *
  84 * The result certainly isn't pretty, and it really shows up cpp's
  85 * weakness as as macro language.  Sorry.  (But let's just give thanks
  86 * there aren't more than 5 arguments...)
  87 */
  88
  89extern struct { char _entry[32]; } hypercall_page[];
  90
  91#define __HYPERCALL             "call hypercall_page+%c[offset]"
  92#define __HYPERCALL_ENTRY(x)                                            \
  93        [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
  94
  95#ifdef CONFIG_X86_32
  96#define __HYPERCALL_RETREG      "eax"
  97#define __HYPERCALL_ARG1REG     "ebx"
  98#define __HYPERCALL_ARG2REG     "ecx"
  99#define __HYPERCALL_ARG3REG     "edx"
 100#define __HYPERCALL_ARG4REG     "esi"
 101#define __HYPERCALL_ARG5REG     "edi"
 102#else
 103#define __HYPERCALL_RETREG      "rax"
 104#define __HYPERCALL_ARG1REG     "rdi"
 105#define __HYPERCALL_ARG2REG     "rsi"
 106#define __HYPERCALL_ARG3REG     "rdx"
 107#define __HYPERCALL_ARG4REG     "r10"
 108#define __HYPERCALL_ARG5REG     "r8"
 109#endif
 110
 111#define __HYPERCALL_DECLS                                               \
 112        register unsigned long __res  asm(__HYPERCALL_RETREG);          \
 113        register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
 114        register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
 115        register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
 116        register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
 117        register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
 118
 119#define __HYPERCALL_0PARAM      "=r" (__res), ASM_CALL_CONSTRAINT
 120#define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
 121#define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
 122#define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
 123#define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
 124#define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
 125
 126#define __HYPERCALL_0ARG()
 127#define __HYPERCALL_1ARG(a1)                                            \
 128        __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
 129#define __HYPERCALL_2ARG(a1,a2)                                         \
 130        __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
 131#define __HYPERCALL_3ARG(a1,a2,a3)                                      \
 132        __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
 133#define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
 134        __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
 135#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
 136        __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
 137
 138#define __HYPERCALL_CLOBBER5    "memory"
 139#define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
 140#define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
 141#define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
 142#define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
 143#define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
 144
 145#define _hypercall0(type, name)                                         \
 146({                                                                      \
 147        __HYPERCALL_DECLS;                                              \
 148        __HYPERCALL_0ARG();                                             \
 149        asm volatile (__HYPERCALL                                       \
 150                      : __HYPERCALL_0PARAM                              \
 151                      : __HYPERCALL_ENTRY(name)                         \
 152                      : __HYPERCALL_CLOBBER0);                          \
 153        (type)__res;                                                    \
 154})
 155
 156#define _hypercall1(type, name, a1)                                     \
 157({                                                                      \
 158        __HYPERCALL_DECLS;                                              \
 159        __HYPERCALL_1ARG(a1);                                           \
 160        asm volatile (__HYPERCALL                                       \
 161                      : __HYPERCALL_1PARAM                              \
 162                      : __HYPERCALL_ENTRY(name)                         \
 163                      : __HYPERCALL_CLOBBER1);                          \
 164        (type)__res;                                                    \
 165})
 166
 167#define _hypercall2(type, name, a1, a2)                                 \
 168({                                                                      \
 169        __HYPERCALL_DECLS;                                              \
 170        __HYPERCALL_2ARG(a1, a2);                                       \
 171        asm volatile (__HYPERCALL                                       \
 172                      : __HYPERCALL_2PARAM                              \
 173                      : __HYPERCALL_ENTRY(name)                         \
 174                      : __HYPERCALL_CLOBBER2);                          \
 175        (type)__res;                                                    \
 176})
 177
 178#define _hypercall3(type, name, a1, a2, a3)                             \
 179({                                                                      \
 180        __HYPERCALL_DECLS;                                              \
 181        __HYPERCALL_3ARG(a1, a2, a3);                                   \
 182        asm volatile (__HYPERCALL                                       \
 183                      : __HYPERCALL_3PARAM                              \
 184                      : __HYPERCALL_ENTRY(name)                         \
 185                      : __HYPERCALL_CLOBBER3);                          \
 186        (type)__res;                                                    \
 187})
 188
 189#define _hypercall4(type, name, a1, a2, a3, a4)                         \
 190({                                                                      \
 191        __HYPERCALL_DECLS;                                              \
 192        __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
 193        asm volatile (__HYPERCALL                                       \
 194                      : __HYPERCALL_4PARAM                              \
 195                      : __HYPERCALL_ENTRY(name)                         \
 196                      : __HYPERCALL_CLOBBER4);                          \
 197        (type)__res;                                                    \
 198})
 199
 200#define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
 201({                                                                      \
 202        __HYPERCALL_DECLS;                                              \
 203        __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
 204        asm volatile (__HYPERCALL                                       \
 205                      : __HYPERCALL_5PARAM                              \
 206                      : __HYPERCALL_ENTRY(name)                         \
 207                      : __HYPERCALL_CLOBBER5);                          \
 208        (type)__res;                                                    \
 209})
 210
 211static inline long
 212privcmd_call(unsigned call,
 213             unsigned long a1, unsigned long a2,
 214             unsigned long a3, unsigned long a4,
 215             unsigned long a5)
 216{
 217        __HYPERCALL_DECLS;
 218        __HYPERCALL_5ARG(a1, a2, a3, a4, a5);
 219
 220        stac();
 221        asm volatile(CALL_NOSPEC
 222                     : __HYPERCALL_5PARAM
 223                     : [thunk_target] "a" (&hypercall_page[call])
 224                     : __HYPERCALL_CLOBBER5);
 225        clac();
 226
 227        return (long)__res;
 228}
 229
 230static inline int
 231HYPERVISOR_set_trap_table(struct trap_info *table)
 232{
 233        return _hypercall1(int, set_trap_table, table);
 234}
 235
 236static inline int
 237HYPERVISOR_mmu_update(struct mmu_update *req, int count,
 238                      int *success_count, domid_t domid)
 239{
 240        return _hypercall4(int, mmu_update, req, count, success_count, domid);
 241}
 242
 243static inline int
 244HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
 245                     int *success_count, domid_t domid)
 246{
 247        return _hypercall4(int, mmuext_op, op, count, success_count, domid);
 248}
 249
 250static inline int
 251HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
 252{
 253        return _hypercall2(int, set_gdt, frame_list, entries);
 254}
 255
 256static inline int
 257HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
 258{
 259        return _hypercall2(int, stack_switch, ss, esp);
 260}
 261
 262#ifdef CONFIG_X86_32
 263static inline int
 264HYPERVISOR_set_callbacks(unsigned long event_selector,
 265                         unsigned long event_address,
 266                         unsigned long failsafe_selector,
 267                         unsigned long failsafe_address)
 268{
 269        return _hypercall4(int, set_callbacks,
 270                           event_selector, event_address,
 271                           failsafe_selector, failsafe_address);
 272}
 273#else  /* CONFIG_X86_64 */
 274static inline int
 275HYPERVISOR_set_callbacks(unsigned long event_address,
 276                        unsigned long failsafe_address,
 277                        unsigned long syscall_address)
 278{
 279        return _hypercall3(int, set_callbacks,
 280                           event_address, failsafe_address,
 281                           syscall_address);
 282}
 283#endif  /* CONFIG_X86_{32,64} */
 284
 285static inline int
 286HYPERVISOR_callback_op(int cmd, void *arg)
 287{
 288        return _hypercall2(int, callback_op, cmd, arg);
 289}
 290
 291static inline int
 292HYPERVISOR_fpu_taskswitch(int set)
 293{
 294        return _hypercall1(int, fpu_taskswitch, set);
 295}
 296
 297static inline int
 298HYPERVISOR_sched_op(int cmd, void *arg)
 299{
 300        return _hypercall2(int, sched_op, cmd, arg);
 301}
 302
 303static inline long
 304HYPERVISOR_set_timer_op(u64 timeout)
 305{
 306        unsigned long timeout_hi = (unsigned long)(timeout>>32);
 307        unsigned long timeout_lo = (unsigned long)timeout;
 308        return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
 309}
 310
 311static inline int
 312HYPERVISOR_mca(struct xen_mc *mc_op)
 313{
 314        mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
 315        return _hypercall1(int, mca, mc_op);
 316}
 317
 318static inline int
 319HYPERVISOR_platform_op(struct xen_platform_op *op)
 320{
 321        op->interface_version = XENPF_INTERFACE_VERSION;
 322        return _hypercall1(int, platform_op, op);
 323}
 324
 325static inline int
 326HYPERVISOR_set_debugreg(int reg, unsigned long value)
 327{
 328        return _hypercall2(int, set_debugreg, reg, value);
 329}
 330
 331static inline unsigned long
 332HYPERVISOR_get_debugreg(int reg)
 333{
 334        return _hypercall1(unsigned long, get_debugreg, reg);
 335}
 336
 337static inline int
 338HYPERVISOR_update_descriptor(u64 ma, u64 desc)
 339{
 340        if (sizeof(u64) == sizeof(long))
 341                return _hypercall2(int, update_descriptor, ma, desc);
 342        return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
 343}
 344
 345static inline long
 346HYPERVISOR_memory_op(unsigned int cmd, void *arg)
 347{
 348        return _hypercall2(long, memory_op, cmd, arg);
 349}
 350
 351static inline int
 352HYPERVISOR_multicall(void *call_list, uint32_t nr_calls)
 353{
 354        return _hypercall2(int, multicall, call_list, nr_calls);
 355}
 356
 357static inline int
 358HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
 359                             unsigned long flags)
 360{
 361        if (sizeof(new_val) == sizeof(long))
 362                return _hypercall3(int, update_va_mapping, va,
 363                                   new_val.pte, flags);
 364        else
 365                return _hypercall4(int, update_va_mapping, va,
 366                                   new_val.pte, new_val.pte >> 32, flags);
 367}
 368extern int __must_check xen_event_channel_op_compat(int, void *);
 369
 370static inline int
 371HYPERVISOR_event_channel_op(int cmd, void *arg)
 372{
 373        int rc = _hypercall2(int, event_channel_op, cmd, arg);
 374        if (unlikely(rc == -ENOSYS))
 375                rc = xen_event_channel_op_compat(cmd, arg);
 376        return rc;
 377}
 378
 379static inline int
 380HYPERVISOR_xen_version(int cmd, void *arg)
 381{
 382        return _hypercall2(int, xen_version, cmd, arg);
 383}
 384
 385static inline int
 386HYPERVISOR_console_io(int cmd, int count, char *str)
 387{
 388        return _hypercall3(int, console_io, cmd, count, str);
 389}
 390
 391extern int __must_check xen_physdev_op_compat(int, void *);
 392
 393static inline int
 394HYPERVISOR_physdev_op(int cmd, void *arg)
 395{
 396        int rc = _hypercall2(int, physdev_op, cmd, arg);
 397        if (unlikely(rc == -ENOSYS))
 398                rc = xen_physdev_op_compat(cmd, arg);
 399        return rc;
 400}
 401
 402static inline int
 403HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
 404{
 405        return _hypercall3(int, grant_table_op, cmd, uop, count);
 406}
 407
 408static inline int
 409HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
 410                                         unsigned long flags, domid_t domid)
 411{
 412        if (sizeof(new_val) == sizeof(long))
 413                return _hypercall4(int, update_va_mapping_otherdomain, va,
 414                                   new_val.pte, flags, domid);
 415        else
 416                return _hypercall5(int, update_va_mapping_otherdomain, va,
 417                                   new_val.pte, new_val.pte >> 32,
 418                                   flags, domid);
 419}
 420
 421static inline int
 422HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
 423{
 424        return _hypercall2(int, vm_assist, cmd, type);
 425}
 426
 427static inline int
 428HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
 429{
 430        return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
 431}
 432
 433#ifdef CONFIG_X86_64
 434static inline int
 435HYPERVISOR_set_segment_base(int reg, unsigned long value)
 436{
 437        return _hypercall2(int, set_segment_base, reg, value);
 438}
 439#endif
 440
 441static inline int
 442HYPERVISOR_suspend(unsigned long start_info_mfn)
 443{
 444        struct sched_shutdown r = { .reason = SHUTDOWN_suspend };
 445
 446        /*
 447         * For a PV guest the tools require that the start_info mfn be
 448         * present in rdx/edx when the hypercall is made. Per the
 449         * hypercall calling convention this is the third hypercall
 450         * argument, which is start_info_mfn here.
 451         */
 452        return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn);
 453}
 454
 455static inline int
 456HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
 457{
 458        return _hypercall2(int, nmi_op, op, arg);
 459}
 460
 461static inline unsigned long __must_check
 462HYPERVISOR_hvm_op(int op, void *arg)
 463{
 464       return _hypercall2(unsigned long, hvm_op, op, arg);
 465}
 466
 467static inline int
 468HYPERVISOR_tmem_op(
 469        struct tmem_op *op)
 470{
 471        return _hypercall1(int, tmem_op, op);
 472}
 473
 474static inline int
 475HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
 476{
 477        return _hypercall2(int, xenpmu_op, op, arg);
 478}
 479
 480static inline int
 481HYPERVISOR_dm_op(
 482        domid_t dom, unsigned int nr_bufs, struct xen_dm_op_buf *bufs)
 483{
 484        int ret;
 485        stac();
 486        ret = _hypercall3(int, dm_op, dom, nr_bufs, bufs);
 487        clac();
 488        return ret;
 489}
 490
 491static inline void
 492MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
 493{
 494        mcl->op = __HYPERVISOR_fpu_taskswitch;
 495        mcl->args[0] = set;
 496
 497        trace_xen_mc_entry(mcl, 1);
 498}
 499
 500static inline void
 501MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
 502                        pte_t new_val, unsigned long flags)
 503{
 504        mcl->op = __HYPERVISOR_update_va_mapping;
 505        mcl->args[0] = va;
 506        if (sizeof(new_val) == sizeof(long)) {
 507                mcl->args[1] = new_val.pte;
 508                mcl->args[2] = flags;
 509        } else {
 510                mcl->args[1] = new_val.pte;
 511                mcl->args[2] = new_val.pte >> 32;
 512                mcl->args[3] = flags;
 513        }
 514
 515        trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4);
 516}
 517
 518static inline void
 519MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
 520                     void *uop, unsigned int count)
 521{
 522        mcl->op = __HYPERVISOR_grant_table_op;
 523        mcl->args[0] = cmd;
 524        mcl->args[1] = (unsigned long)uop;
 525        mcl->args[2] = count;
 526
 527        trace_xen_mc_entry(mcl, 3);
 528}
 529
 530static inline void
 531MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
 532                                    pte_t new_val, unsigned long flags,
 533                                    domid_t domid)
 534{
 535        mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
 536        mcl->args[0] = va;
 537        if (sizeof(new_val) == sizeof(long)) {
 538                mcl->args[1] = new_val.pte;
 539                mcl->args[2] = flags;
 540                mcl->args[3] = domid;
 541        } else {
 542                mcl->args[1] = new_val.pte;
 543                mcl->args[2] = new_val.pte >> 32;
 544                mcl->args[3] = flags;
 545                mcl->args[4] = domid;
 546        }
 547
 548        trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5);
 549}
 550
 551static inline void
 552MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
 553                        struct desc_struct desc)
 554{
 555        mcl->op = __HYPERVISOR_update_descriptor;
 556        if (sizeof(maddr) == sizeof(long)) {
 557                mcl->args[0] = maddr;
 558                mcl->args[1] = *(unsigned long *)&desc;
 559        } else {
 560                u32 *p = (u32 *)&desc;
 561
 562                mcl->args[0] = maddr;
 563                mcl->args[1] = maddr >> 32;
 564                mcl->args[2] = *p++;
 565                mcl->args[3] = *p;
 566        }
 567
 568        trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4);
 569}
 570
 571static inline void
 572MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
 573{
 574        mcl->op = __HYPERVISOR_memory_op;
 575        mcl->args[0] = cmd;
 576        mcl->args[1] = (unsigned long)arg;
 577
 578        trace_xen_mc_entry(mcl, 2);
 579}
 580
 581static inline void
 582MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
 583                 int count, int *success_count, domid_t domid)
 584{
 585        mcl->op = __HYPERVISOR_mmu_update;
 586        mcl->args[0] = (unsigned long)req;
 587        mcl->args[1] = count;
 588        mcl->args[2] = (unsigned long)success_count;
 589        mcl->args[3] = domid;
 590
 591        trace_xen_mc_entry(mcl, 4);
 592}
 593
 594static inline void
 595MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
 596                int *success_count, domid_t domid)
 597{
 598        mcl->op = __HYPERVISOR_mmuext_op;
 599        mcl->args[0] = (unsigned long)op;
 600        mcl->args[1] = count;
 601        mcl->args[2] = (unsigned long)success_count;
 602        mcl->args[3] = domid;
 603
 604        trace_xen_mc_entry(mcl, 4);
 605}
 606
 607static inline void
 608MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
 609{
 610        mcl->op = __HYPERVISOR_set_gdt;
 611        mcl->args[0] = (unsigned long)frames;
 612        mcl->args[1] = entries;
 613
 614        trace_xen_mc_entry(mcl, 2);
 615}
 616
 617static inline void
 618MULTI_stack_switch(struct multicall_entry *mcl,
 619                   unsigned long ss, unsigned long esp)
 620{
 621        mcl->op = __HYPERVISOR_stack_switch;
 622        mcl->args[0] = ss;
 623        mcl->args[1] = esp;
 624
 625        trace_xen_mc_entry(mcl, 2);
 626}
 627
 628#endif /* _ASM_X86_XEN_HYPERCALL_H */
 629