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 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 }) 207 208 static inline long 209 privcmd_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 } 224 225 static inline int 226 HYPERVISOR_set_trap_table(struct trap_info *table) 227 { 228 return _hypercall1(int, set_trap_table, table); 229 } 230 231 static inline int 232 HYPERVISOR_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 } 237 238 static inline int 239 HYPERVISOR_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 } 244 245 static inline int 246 HYPERVISOR_set_gdt(unsigned long *frame_list, int entries) 247 { 248 return _hypercall2(int, set_gdt, frame_list, entries); 249 } 250 251 static inline int 252 HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp) 253 { 254 return _hypercall2(int, stack_switch, ss, esp); 255 } 256 257 #ifdef CONFIG_X86_32 258 static inline int 259 HYPERVISOR_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 */ 269 static inline int 270 HYPERVISOR_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} */ 279 280 static inline int 281 HYPERVISOR_callback_op(int cmd, void *arg) 282 { 283 return _hypercall2(int, callback_op, cmd, arg); 284 } 285 286 static inline int 287 HYPERVISOR_fpu_taskswitch(int set) 288 { 289 return _hypercall1(int, fpu_taskswitch, set); 290 } 291 292 static inline int 293 HYPERVISOR_sched_op(int cmd, void *arg) 294 { 295 return _hypercall2(int, sched_op, cmd, arg); 296 } 297 298 static inline long 299 HYPERVISOR_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 } 305 306 static inline int 307 HYPERVISOR_mca(struct xen_mc *mc_op) 308 { 309 mc_op->interface_version = XEN_MCA_INTERFACE_VERSION; 310 return _hypercall1(int, mca, mc_op); 311 } 312 313 static inline int 314 HYPERVISOR_platform_op(struct xen_platform_op *op) 315 { 316 op->interface_version = XENPF_INTERFACE_VERSION; 317 return _hypercall1(int, platform_op, op); 318 } 319 320 static inline int 321 HYPERVISOR_set_debugreg(int reg, unsigned long value) 322 { 323 return _hypercall2(int, set_debugreg, reg, value); 324 } 325 326 static inline unsigned long 327 HYPERVISOR_get_debugreg(int reg) 328 { 329 return _hypercall1(unsigned long, get_debugreg, reg); 330 } 331 332 static inline int 333 HYPERVISOR_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 } 339 340 static inline long 341 HYPERVISOR_memory_op(unsigned int cmd, void *arg) 342 { 343 return _hypercall2(long, memory_op, cmd, arg); 344 } 345 346 static inline int 347 HYPERVISOR_multicall(void *call_list, uint32_t nr_calls) 348 { 349 return _hypercall2(int, multicall, call_list, nr_calls); 350 } 351 352 static inline int 353 HYPERVISOR_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 } 363 extern int __must_check xen_event_channel_op_compat(int, void *); 364 365 static inline int 366 HYPERVISOR_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 } 373 374 static inline int 375 HYPERVISOR_xen_version(int cmd, void *arg) 376 { 377 return _hypercall2(int, xen_version, cmd, arg); 378 } 379 380 static inline int 381 HYPERVISOR_console_io(int cmd, int count, char *str) 382 { 383 return _hypercall3(int, console_io, cmd, count, str); 384 } 385 386 extern int __must_check xen_physdev_op_compat(int, void *); 387 388 static inline int 389 HYPERVISOR_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 } 396 397 static inline int 398 HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count) 399 { 400 return _hypercall3(int, grant_table_op, cmd, uop, count); 401 } 402 403 static inline int 404 HYPERVISOR_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 } 415 416 static inline int 417 HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type) 418 { 419 return _hypercall2(int, vm_assist, cmd, type); 420 } 421 422 static inline int 423 HYPERVISOR_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_64 429 static inline int 430 HYPERVISOR_set_segment_base(int reg, unsigned long value) 431 { 432 return _hypercall2(int, set_segment_base, reg, value); 433 } 434 #endif 435 436 static inline int 437 HYPERVISOR_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 } 449 450 static inline int 451 HYPERVISOR_nmi_op(unsigned long op, unsigned long arg) 452 { 453 return _hypercall2(int, nmi_op, op, arg); 454 } 455 456 static inline unsigned long __must_check 457 HYPERVISOR_hvm_op(int op, void *arg) 458 { 459 return _hypercall2(unsigned long, hvm_op, op, arg); 460 } 461 462 static inline int 463 HYPERVISOR_tmem_op( 464 struct tmem_op *op) 465 { 466 return _hypercall1(int, tmem_op, op); 467 } 468 469 static inline int 470 HYPERVISOR_xenpmu_op(unsigned int op, void *arg) 471 { 472 return _hypercall2(int, xenpmu_op, op, arg); 473 } 474 475 static inline void 476 MULTI_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 } 483 484 static inline void 485 MULTI_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 } 501 502 static inline void 503 MULTI_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 } 513 514 static inline void 515 MULTI_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 } 534 535 static inline void 536 MULTI_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 } 552 553 static inline void 554 MULTI_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 } 562 563 static inline void 564 MULTI_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 } 575 576 static inline void 577 MULTI_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 } 588 589 static inline void 590 MULTI_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 } 598 599 static inline void 600 MULTI_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