1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_PARAVIRT_H 3 #define _ASM_X86_PARAVIRT_H 4 /* Various instructions on x86 need to be replaced for 5 * para-virtualization: those hooks are defined here. */ 6 7 #ifdef CONFIG_PARAVIRT 8 #include <asm/pgtable_types.h> 9 #include <asm/asm.h> 10 #include <asm/nospec-branch.h> 11 12 #include <asm/paravirt_types.h> 13 14 #ifndef __ASSEMBLY__ 15 #include <linux/bug.h> 16 #include <linux/types.h> 17 #include <linux/cpumask.h> 18 #include <asm/frame.h> 19 20 static inline void load_sp0(unsigned long sp0) 21 { 22 PVOP_VCALL1(pv_cpu_ops.load_sp0, sp0); 23 } 24 25 /* The paravirtualized CPUID instruction. */ 26 static inline void __cpuid(unsigned int *eax, unsigned int *ebx, 27 unsigned int *ecx, unsigned int *edx) 28 { 29 PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx); 30 } 31 32 /* 33 * These special macros can be used to get or set a debugging register 34 */ 35 static inline unsigned long paravirt_get_debugreg(int reg) 36 { 37 return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg); 38 } 39 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg) 40 static inline void set_debugreg(unsigned long val, int reg) 41 { 42 PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val); 43 } 44 45 static inline unsigned long read_cr0(void) 46 { 47 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0); 48 } 49 50 static inline void write_cr0(unsigned long x) 51 { 52 PVOP_VCALL1(pv_cpu_ops.write_cr0, x); 53 } 54 55 static inline unsigned long read_cr2(void) 56 { 57 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2); 58 } 59 60 static inline void write_cr2(unsigned long x) 61 { 62 PVOP_VCALL1(pv_mmu_ops.write_cr2, x); 63 } 64 65 static inline unsigned long __read_cr3(void) 66 { 67 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3); 68 } 69 70 static inline void write_cr3(unsigned long x) 71 { 72 PVOP_VCALL1(pv_mmu_ops.write_cr3, x); 73 } 74 75 static inline void __write_cr4(unsigned long x) 76 { 77 PVOP_VCALL1(pv_cpu_ops.write_cr4, x); 78 } 79 80 #ifdef CONFIG_X86_64 81 static inline unsigned long read_cr8(void) 82 { 83 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8); 84 } 85 86 static inline void write_cr8(unsigned long x) 87 { 88 PVOP_VCALL1(pv_cpu_ops.write_cr8, x); 89 } 90 #endif 91 92 static inline void arch_safe_halt(void) 93 { 94 PVOP_VCALL0(pv_irq_ops.safe_halt); 95 } 96 97 static inline void halt(void) 98 { 99 PVOP_VCALL0(pv_irq_ops.halt); 100 } 101 102 static inline void wbinvd(void) 103 { 104 PVOP_VCALL0(pv_cpu_ops.wbinvd); 105 } 106 107 #define get_kernel_rpl() (pv_info.kernel_rpl) 108 109 static inline u64 paravirt_read_msr(unsigned msr) 110 { 111 return PVOP_CALL1(u64, pv_cpu_ops.read_msr, msr); 112 } 113 114 static inline void paravirt_write_msr(unsigned msr, 115 unsigned low, unsigned high) 116 { 117 PVOP_VCALL3(pv_cpu_ops.write_msr, msr, low, high); 118 } 119 120 static inline u64 paravirt_read_msr_safe(unsigned msr, int *err) 121 { 122 return PVOP_CALL2(u64, pv_cpu_ops.read_msr_safe, msr, err); 123 } 124 125 static inline int paravirt_write_msr_safe(unsigned msr, 126 unsigned low, unsigned high) 127 { 128 return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high); 129 } 130 131 #define rdmsr(msr, val1, val2) \ 132 do { \ 133 u64 _l = paravirt_read_msr(msr); \ 134 val1 = (u32)_l; \ 135 val2 = _l >> 32; \ 136 } while (0) 137 138 #define wrmsr(msr, val1, val2) \ 139 do { \ 140 paravirt_write_msr(msr, val1, val2); \ 141 } while (0) 142 143 #define rdmsrl(msr, val) \ 144 do { \ 145 val = paravirt_read_msr(msr); \ 146 } while (0) 147 148 static inline void wrmsrl(unsigned msr, u64 val) 149 { 150 wrmsr(msr, (u32)val, (u32)(val>>32)); 151 } 152 153 #define wrmsr_safe(msr, a, b) paravirt_write_msr_safe(msr, a, b) 154 155 /* rdmsr with exception handling */ 156 #define rdmsr_safe(msr, a, b) \ 157 ({ \ 158 int _err; \ 159 u64 _l = paravirt_read_msr_safe(msr, &_err); \ 160 (*a) = (u32)_l; \ 161 (*b) = _l >> 32; \ 162 _err; \ 163 }) 164 165 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p) 166 { 167 int err; 168 169 *p = paravirt_read_msr_safe(msr, &err); 170 return err; 171 } 172 173 static inline unsigned long long paravirt_sched_clock(void) 174 { 175 return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock); 176 } 177 178 struct static_key; 179 extern struct static_key paravirt_steal_enabled; 180 extern struct static_key paravirt_steal_rq_enabled; 181 182 static inline u64 paravirt_steal_clock(int cpu) 183 { 184 return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu); 185 } 186 187 static inline unsigned long long paravirt_read_pmc(int counter) 188 { 189 return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter); 190 } 191 192 #define rdpmc(counter, low, high) \ 193 do { \ 194 u64 _l = paravirt_read_pmc(counter); \ 195 low = (u32)_l; \ 196 high = _l >> 32; \ 197 } while (0) 198 199 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter)) 200 201 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries) 202 { 203 PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries); 204 } 205 206 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries) 207 { 208 PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries); 209 } 210 211 static inline void load_TR_desc(void) 212 { 213 PVOP_VCALL0(pv_cpu_ops.load_tr_desc); 214 } 215 static inline void load_gdt(const struct desc_ptr *dtr) 216 { 217 PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr); 218 } 219 static inline void load_idt(const struct desc_ptr *dtr) 220 { 221 PVOP_VCALL1(pv_cpu_ops.load_idt, dtr); 222 } 223 static inline void set_ldt(const void *addr, unsigned entries) 224 { 225 PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries); 226 } 227 static inline unsigned long paravirt_store_tr(void) 228 { 229 return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr); 230 } 231 #define store_tr(tr) ((tr) = paravirt_store_tr()) 232 static inline void load_TLS(struct thread_struct *t, unsigned cpu) 233 { 234 PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu); 235 } 236 237 #ifdef CONFIG_X86_64 238 static inline void load_gs_index(unsigned int gs) 239 { 240 PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs); 241 } 242 #endif 243 244 static inline void write_ldt_entry(struct desc_struct *dt, int entry, 245 const void *desc) 246 { 247 PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc); 248 } 249 250 static inline void write_gdt_entry(struct desc_struct *dt, int entry, 251 void *desc, int type) 252 { 253 PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type); 254 } 255 256 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g) 257 { 258 PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g); 259 } 260 static inline void set_iopl_mask(unsigned mask) 261 { 262 PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask); 263 } 264 265 /* The paravirtualized I/O functions */ 266 static inline void slow_down_io(void) 267 { 268 pv_cpu_ops.io_delay(); 269 #ifdef REALLY_SLOW_IO 270 pv_cpu_ops.io_delay(); 271 pv_cpu_ops.io_delay(); 272 pv_cpu_ops.io_delay(); 273 #endif 274 } 275 276 static inline void paravirt_activate_mm(struct mm_struct *prev, 277 struct mm_struct *next) 278 { 279 PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next); 280 } 281 282 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm, 283 struct mm_struct *mm) 284 { 285 PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm); 286 } 287 288 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm) 289 { 290 PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm); 291 } 292 293 static inline void __flush_tlb(void) 294 { 295 PVOP_VCALL0(pv_mmu_ops.flush_tlb_user); 296 } 297 static inline void __flush_tlb_global(void) 298 { 299 PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel); 300 } 301 static inline void __flush_tlb_one_user(unsigned long addr) 302 { 303 PVOP_VCALL1(pv_mmu_ops.flush_tlb_one_user, addr); 304 } 305 306 static inline void flush_tlb_others(const struct cpumask *cpumask, 307 const struct flush_tlb_info *info) 308 { 309 PVOP_VCALL2(pv_mmu_ops.flush_tlb_others, cpumask, info); 310 } 311 312 static inline int paravirt_pgd_alloc(struct mm_struct *mm) 313 { 314 return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm); 315 } 316 317 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) 318 { 319 PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd); 320 } 321 322 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) 323 { 324 PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn); 325 } 326 static inline void paravirt_release_pte(unsigned long pfn) 327 { 328 PVOP_VCALL1(pv_mmu_ops.release_pte, pfn); 329 } 330 331 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) 332 { 333 PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn); 334 } 335 336 static inline void paravirt_release_pmd(unsigned long pfn) 337 { 338 PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn); 339 } 340 341 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) 342 { 343 PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn); 344 } 345 static inline void paravirt_release_pud(unsigned long pfn) 346 { 347 PVOP_VCALL1(pv_mmu_ops.release_pud, pfn); 348 } 349 350 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) 351 { 352 PVOP_VCALL2(pv_mmu_ops.alloc_p4d, mm, pfn); 353 } 354 355 static inline void paravirt_release_p4d(unsigned long pfn) 356 { 357 PVOP_VCALL1(pv_mmu_ops.release_p4d, pfn); 358 } 359 360 static inline pte_t __pte(pteval_t val) 361 { 362 pteval_t ret; 363 364 if (sizeof(pteval_t) > sizeof(long)) 365 ret = PVOP_CALLEE2(pteval_t, 366 pv_mmu_ops.make_pte, 367 val, (u64)val >> 32); 368 else 369 ret = PVOP_CALLEE1(pteval_t, 370 pv_mmu_ops.make_pte, 371 val); 372 373 return (pte_t) { .pte = ret }; 374 } 375 376 static inline pteval_t pte_val(pte_t pte) 377 { 378 pteval_t ret; 379 380 if (sizeof(pteval_t) > sizeof(long)) 381 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val, 382 pte.pte, (u64)pte.pte >> 32); 383 else 384 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val, 385 pte.pte); 386 387 return ret; 388 } 389 390 static inline pgd_t __pgd(pgdval_t val) 391 { 392 pgdval_t ret; 393 394 if (sizeof(pgdval_t) > sizeof(long)) 395 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd, 396 val, (u64)val >> 32); 397 else 398 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd, 399 val); 400 401 return (pgd_t) { ret }; 402 } 403 404 static inline pgdval_t pgd_val(pgd_t pgd) 405 { 406 pgdval_t ret; 407 408 if (sizeof(pgdval_t) > sizeof(long)) 409 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val, 410 pgd.pgd, (u64)pgd.pgd >> 32); 411 else 412 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val, 413 pgd.pgd); 414 415 return ret; 416 } 417 418 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION 419 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, 420 pte_t *ptep) 421 { 422 pteval_t ret; 423 424 ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start, 425 mm, addr, ptep); 426 427 return (pte_t) { .pte = ret }; 428 } 429 430 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, 431 pte_t *ptep, pte_t pte) 432 { 433 if (sizeof(pteval_t) > sizeof(long)) 434 /* 5 arg words */ 435 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte); 436 else 437 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit, 438 mm, addr, ptep, pte.pte); 439 } 440 441 static inline void set_pte(pte_t *ptep, pte_t pte) 442 { 443 if (sizeof(pteval_t) > sizeof(long)) 444 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep, 445 pte.pte, (u64)pte.pte >> 32); 446 else 447 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep, 448 pte.pte); 449 } 450 451 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 452 pte_t *ptep, pte_t pte) 453 { 454 if (sizeof(pteval_t) > sizeof(long)) 455 /* 5 arg words */ 456 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte); 457 else 458 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte); 459 } 460 461 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 462 { 463 pmdval_t val = native_pmd_val(pmd); 464 465 if (sizeof(pmdval_t) > sizeof(long)) 466 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32); 467 else 468 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val); 469 } 470 471 #if CONFIG_PGTABLE_LEVELS >= 3 472 static inline pmd_t __pmd(pmdval_t val) 473 { 474 pmdval_t ret; 475 476 if (sizeof(pmdval_t) > sizeof(long)) 477 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd, 478 val, (u64)val >> 32); 479 else 480 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd, 481 val); 482 483 return (pmd_t) { ret }; 484 } 485 486 static inline pmdval_t pmd_val(pmd_t pmd) 487 { 488 pmdval_t ret; 489 490 if (sizeof(pmdval_t) > sizeof(long)) 491 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val, 492 pmd.pmd, (u64)pmd.pmd >> 32); 493 else 494 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val, 495 pmd.pmd); 496 497 return ret; 498 } 499 500 static inline void set_pud(pud_t *pudp, pud_t pud) 501 { 502 pudval_t val = native_pud_val(pud); 503 504 if (sizeof(pudval_t) > sizeof(long)) 505 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp, 506 val, (u64)val >> 32); 507 else 508 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp, 509 val); 510 } 511 #if CONFIG_PGTABLE_LEVELS >= 4 512 static inline pud_t __pud(pudval_t val) 513 { 514 pudval_t ret; 515 516 if (sizeof(pudval_t) > sizeof(long)) 517 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud, 518 val, (u64)val >> 32); 519 else 520 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud, 521 val); 522 523 return (pud_t) { ret }; 524 } 525 526 static inline pudval_t pud_val(pud_t pud) 527 { 528 pudval_t ret; 529 530 if (sizeof(pudval_t) > sizeof(long)) 531 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val, 532 pud.pud, (u64)pud.pud >> 32); 533 else 534 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val, 535 pud.pud); 536 537 return ret; 538 } 539 540 static inline void pud_clear(pud_t *pudp) 541 { 542 set_pud(pudp, __pud(0)); 543 } 544 545 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d) 546 { 547 p4dval_t val = native_p4d_val(p4d); 548 549 if (sizeof(p4dval_t) > sizeof(long)) 550 PVOP_VCALL3(pv_mmu_ops.set_p4d, p4dp, 551 val, (u64)val >> 32); 552 else 553 PVOP_VCALL2(pv_mmu_ops.set_p4d, p4dp, 554 val); 555 } 556 557 #if CONFIG_PGTABLE_LEVELS >= 5 558 559 static inline p4d_t __p4d(p4dval_t val) 560 { 561 p4dval_t ret = PVOP_CALLEE1(p4dval_t, pv_mmu_ops.make_p4d, val); 562 563 return (p4d_t) { ret }; 564 } 565 566 static inline p4dval_t p4d_val(p4d_t p4d) 567 { 568 return PVOP_CALLEE1(p4dval_t, pv_mmu_ops.p4d_val, p4d.p4d); 569 } 570 571 static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd) 572 { 573 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, native_pgd_val(pgd)); 574 } 575 576 #define set_pgd(pgdp, pgdval) do { \ 577 if (pgtable_l5_enabled()) \ 578 __set_pgd(pgdp, pgdval); \ 579 else \ 580 set_p4d((p4d_t *)(pgdp), (p4d_t) { (pgdval).pgd }); \ 581 } while (0) 582 583 #define pgd_clear(pgdp) do { \ 584 if (pgtable_l5_enabled()) \ 585 set_pgd(pgdp, __pgd(0)); \ 586 } while (0) 587 588 #endif /* CONFIG_PGTABLE_LEVELS == 5 */ 589 590 static inline void p4d_clear(p4d_t *p4dp) 591 { 592 set_p4d(p4dp, __p4d(0)); 593 } 594 595 #endif /* CONFIG_PGTABLE_LEVELS == 4 */ 596 597 #endif /* CONFIG_PGTABLE_LEVELS >= 3 */ 598 599 #ifdef CONFIG_X86_PAE 600 /* Special-case pte-setting operations for PAE, which can't update a 601 64-bit pte atomically */ 602 static inline void set_pte_atomic(pte_t *ptep, pte_t pte) 603 { 604 PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep, 605 pte.pte, pte.pte >> 32); 606 } 607 608 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 609 pte_t *ptep) 610 { 611 PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep); 612 } 613 614 static inline void pmd_clear(pmd_t *pmdp) 615 { 616 PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp); 617 } 618 #else /* !CONFIG_X86_PAE */ 619 static inline void set_pte_atomic(pte_t *ptep, pte_t pte) 620 { 621 set_pte(ptep, pte); 622 } 623 624 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 625 pte_t *ptep) 626 { 627 set_pte_at(mm, addr, ptep, __pte(0)); 628 } 629 630 static inline void pmd_clear(pmd_t *pmdp) 631 { 632 set_pmd(pmdp, __pmd(0)); 633 } 634 #endif /* CONFIG_X86_PAE */ 635 636 #define __HAVE_ARCH_START_CONTEXT_SWITCH 637 static inline void arch_start_context_switch(struct task_struct *prev) 638 { 639 PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev); 640 } 641 642 static inline void arch_end_context_switch(struct task_struct *next) 643 { 644 PVOP_VCALL1(pv_cpu_ops.end_context_switch, next); 645 } 646 647 #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE 648 static inline void arch_enter_lazy_mmu_mode(void) 649 { 650 PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter); 651 } 652 653 static inline void arch_leave_lazy_mmu_mode(void) 654 { 655 PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave); 656 } 657 658 static inline void arch_flush_lazy_mmu_mode(void) 659 { 660 PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush); 661 } 662 663 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx, 664 phys_addr_t phys, pgprot_t flags) 665 { 666 pv_mmu_ops.set_fixmap(idx, phys, flags); 667 } 668 669 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS) 670 671 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock, 672 u32 val) 673 { 674 PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val); 675 } 676 677 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock) 678 { 679 PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock); 680 } 681 682 static __always_inline void pv_wait(u8 *ptr, u8 val) 683 { 684 PVOP_VCALL2(pv_lock_ops.wait, ptr, val); 685 } 686 687 static __always_inline void pv_kick(int cpu) 688 { 689 PVOP_VCALL1(pv_lock_ops.kick, cpu); 690 } 691 692 static __always_inline bool pv_vcpu_is_preempted(long cpu) 693 { 694 return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu); 695 } 696 697 #endif /* SMP && PARAVIRT_SPINLOCKS */ 698 699 #ifdef CONFIG_X86_32 700 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;" 701 #define PV_RESTORE_REGS "popl %edx; popl %ecx;" 702 703 /* save and restore all caller-save registers, except return value */ 704 #define PV_SAVE_ALL_CALLER_REGS "pushl %ecx;" 705 #define PV_RESTORE_ALL_CALLER_REGS "popl %ecx;" 706 707 #define PV_FLAGS_ARG "0" 708 #define PV_EXTRA_CLOBBERS 709 #define PV_VEXTRA_CLOBBERS 710 #else 711 /* save and restore all caller-save registers, except return value */ 712 #define PV_SAVE_ALL_CALLER_REGS \ 713 "push %rcx;" \ 714 "push %rdx;" \ 715 "push %rsi;" \ 716 "push %rdi;" \ 717 "push %r8;" \ 718 "push %r9;" \ 719 "push %r10;" \ 720 "push %r11;" 721 #define PV_RESTORE_ALL_CALLER_REGS \ 722 "pop %r11;" \ 723 "pop %r10;" \ 724 "pop %r9;" \ 725 "pop %r8;" \ 726 "pop %rdi;" \ 727 "pop %rsi;" \ 728 "pop %rdx;" \ 729 "pop %rcx;" 730 731 /* We save some registers, but all of them, that's too much. We clobber all 732 * caller saved registers but the argument parameter */ 733 #define PV_SAVE_REGS "pushq %%rdi;" 734 #define PV_RESTORE_REGS "popq %%rdi;" 735 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi" 736 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi" 737 #define PV_FLAGS_ARG "D" 738 #endif 739 740 /* 741 * Generate a thunk around a function which saves all caller-save 742 * registers except for the return value. This allows C functions to 743 * be called from assembler code where fewer than normal registers are 744 * available. It may also help code generation around calls from C 745 * code if the common case doesn't use many registers. 746 * 747 * When a callee is wrapped in a thunk, the caller can assume that all 748 * arg regs and all scratch registers are preserved across the 749 * call. The return value in rax/eax will not be saved, even for void 750 * functions. 751 */ 752 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func 753 #define PV_CALLEE_SAVE_REGS_THUNK(func) \ 754 extern typeof(func) __raw_callee_save_##func; \ 755 \ 756 asm(".pushsection .text;" \ 757 ".globl " PV_THUNK_NAME(func) ";" \ 758 ".type " PV_THUNK_NAME(func) ", @function;" \ 759 PV_THUNK_NAME(func) ":" \ 760 FRAME_BEGIN \ 761 PV_SAVE_ALL_CALLER_REGS \ 762 "call " #func ";" \ 763 PV_RESTORE_ALL_CALLER_REGS \ 764 FRAME_END \ 765 "ret;" \ 766 ".popsection") 767 768 /* Get a reference to a callee-save function */ 769 #define PV_CALLEE_SAVE(func) \ 770 ((struct paravirt_callee_save) { __raw_callee_save_##func }) 771 772 /* Promise that "func" already uses the right calling convention */ 773 #define __PV_IS_CALLEE_SAVE(func) \ 774 ((struct paravirt_callee_save) { func }) 775 776 static inline notrace unsigned long arch_local_save_flags(void) 777 { 778 return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl); 779 } 780 781 static inline notrace void arch_local_irq_restore(unsigned long f) 782 { 783 PVOP_VCALLEE1(pv_irq_ops.restore_fl, f); 784 } 785 786 static inline notrace void arch_local_irq_disable(void) 787 { 788 PVOP_VCALLEE0(pv_irq_ops.irq_disable); 789 } 790 791 static inline notrace void arch_local_irq_enable(void) 792 { 793 PVOP_VCALLEE0(pv_irq_ops.irq_enable); 794 } 795 796 static inline notrace unsigned long arch_local_irq_save(void) 797 { 798 unsigned long f; 799 800 f = arch_local_save_flags(); 801 arch_local_irq_disable(); 802 return f; 803 } 804 805 806 /* Make sure as little as possible of this mess escapes. */ 807 #undef PARAVIRT_CALL 808 #undef __PVOP_CALL 809 #undef __PVOP_VCALL 810 #undef PVOP_VCALL0 811 #undef PVOP_CALL0 812 #undef PVOP_VCALL1 813 #undef PVOP_CALL1 814 #undef PVOP_VCALL2 815 #undef PVOP_CALL2 816 #undef PVOP_VCALL3 817 #undef PVOP_CALL3 818 #undef PVOP_VCALL4 819 #undef PVOP_CALL4 820 821 extern void default_banner(void); 822 823 #else /* __ASSEMBLY__ */ 824 825 #define _PVSITE(ptype, clobbers, ops, word, algn) \ 826 771:; \ 827 ops; \ 828 772:; \ 829 .pushsection .parainstructions,"a"; \ 830 .align algn; \ 831 word 771b; \ 832 .byte ptype; \ 833 .byte 772b-771b; \ 834 .short clobbers; \ 835 .popsection 836 837 838 #define COND_PUSH(set, mask, reg) \ 839 .if ((~(set)) & mask); push %reg; .endif 840 #define COND_POP(set, mask, reg) \ 841 .if ((~(set)) & mask); pop %reg; .endif 842 843 #ifdef CONFIG_X86_64 844 845 #define PV_SAVE_REGS(set) \ 846 COND_PUSH(set, CLBR_RAX, rax); \ 847 COND_PUSH(set, CLBR_RCX, rcx); \ 848 COND_PUSH(set, CLBR_RDX, rdx); \ 849 COND_PUSH(set, CLBR_RSI, rsi); \ 850 COND_PUSH(set, CLBR_RDI, rdi); \ 851 COND_PUSH(set, CLBR_R8, r8); \ 852 COND_PUSH(set, CLBR_R9, r9); \ 853 COND_PUSH(set, CLBR_R10, r10); \ 854 COND_PUSH(set, CLBR_R11, r11) 855 #define PV_RESTORE_REGS(set) \ 856 COND_POP(set, CLBR_R11, r11); \ 857 COND_POP(set, CLBR_R10, r10); \ 858 COND_POP(set, CLBR_R9, r9); \ 859 COND_POP(set, CLBR_R8, r8); \ 860 COND_POP(set, CLBR_RDI, rdi); \ 861 COND_POP(set, CLBR_RSI, rsi); \ 862 COND_POP(set, CLBR_RDX, rdx); \ 863 COND_POP(set, CLBR_RCX, rcx); \ 864 COND_POP(set, CLBR_RAX, rax) 865 866 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 8) 867 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8) 868 #define PARA_INDIRECT(addr) *addr(%rip) 869 #else 870 #define PV_SAVE_REGS(set) \ 871 COND_PUSH(set, CLBR_EAX, eax); \ 872 COND_PUSH(set, CLBR_EDI, edi); \ 873 COND_PUSH(set, CLBR_ECX, ecx); \ 874 COND_PUSH(set, CLBR_EDX, edx) 875 #define PV_RESTORE_REGS(set) \ 876 COND_POP(set, CLBR_EDX, edx); \ 877 COND_POP(set, CLBR_ECX, ecx); \ 878 COND_POP(set, CLBR_EDI, edi); \ 879 COND_POP(set, CLBR_EAX, eax) 880 881 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4) 882 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4) 883 #define PARA_INDIRECT(addr) *%cs:addr 884 #endif 885 886 #define INTERRUPT_RETURN \ 887 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE, \ 888 ANNOTATE_RETPOLINE_SAFE; \ 889 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret);) 890 891 #define DISABLE_INTERRUPTS(clobbers) \ 892 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \ 893 PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \ 894 ANNOTATE_RETPOLINE_SAFE; \ 895 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable); \ 896 PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);) 897 898 #define ENABLE_INTERRUPTS(clobbers) \ 899 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers, \ 900 PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \ 901 ANNOTATE_RETPOLINE_SAFE; \ 902 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable); \ 903 PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);) 904 905 #ifdef CONFIG_X86_32 906 #define GET_CR0_INTO_EAX \ 907 push %ecx; push %edx; \ 908 ANNOTATE_RETPOLINE_SAFE; \ 909 call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \ 910 pop %edx; pop %ecx 911 #else /* !CONFIG_X86_32 */ 912 913 /* 914 * If swapgs is used while the userspace stack is still current, 915 * there's no way to call a pvop. The PV replacement *must* be 916 * inlined, or the swapgs instruction must be trapped and emulated. 917 */ 918 #define SWAPGS_UNSAFE_STACK \ 919 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \ 920 swapgs) 921 922 /* 923 * Note: swapgs is very special, and in practise is either going to be 924 * implemented with a single "swapgs" instruction or something very 925 * special. Either way, we don't need to save any registers for 926 * it. 927 */ 928 #define SWAPGS \ 929 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \ 930 ANNOTATE_RETPOLINE_SAFE; \ 931 call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs); \ 932 ) 933 934 #define GET_CR2_INTO_RAX \ 935 ANNOTATE_RETPOLINE_SAFE; \ 936 call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2); 937 938 #define USERGS_SYSRET64 \ 939 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64), \ 940 CLBR_NONE, \ 941 ANNOTATE_RETPOLINE_SAFE; \ 942 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64);) 943 944 #ifdef CONFIG_DEBUG_ENTRY 945 #define SAVE_FLAGS(clobbers) \ 946 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_save_fl), clobbers, \ 947 PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \ 948 ANNOTATE_RETPOLINE_SAFE; \ 949 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_save_fl); \ 950 PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);) 951 #endif 952 953 #endif /* CONFIG_X86_32 */ 954 955 #endif /* __ASSEMBLY__ */ 956 #else /* CONFIG_PARAVIRT */ 957 # define default_banner x86_init_noop 958 #ifndef __ASSEMBLY__ 959 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm, 960 struct mm_struct *mm) 961 { 962 } 963 964 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm) 965 { 966 } 967 #endif /* __ASSEMBLY__ */ 968 #endif /* !CONFIG_PARAVIRT */ 969 #endif /* _ASM_X86_PARAVIRT_H */ 970