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