arch/x86/include/asm/paravirt.h

   1 #ifndef _ASM_X86_PARAVIRT_H
   2 #define _ASM_X86_PARAVIRT_H
   3 /* Various instructions on x86 need to be replaced for
   4  * para-virtualization: those hooks are defined here. */
   5
   6 #ifdef CONFIG_PARAVIRT
   7 #include <asm/pgtable_types.h>
   8 #include <asm/asm.h>
   9
  10 #include <asm/paravirt_types.h>
  11
  12 #ifndef __ASSEMBLY__
  13 #include <linux/bug.h>
  14 #include <linux/types.h>
  15 #include <linux/cpumask.h>
  16 #include <asm/frame.h>
  17
  18 static inline void load_sp0(struct tss_struct *tss,
  19                              struct thread_struct *thread)
  20 {
  21         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
  22 }
  23
  24 /* The paravirtualized CPUID instruction. */
  25 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
  26                            unsigned int *ecx, unsigned int *edx)
  27 {
  28         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
  29 }
  30
  31 /*
  32  * These special macros can be used to get or set a debugging register
  33  */
  34 static inline unsigned long paravirt_get_debugreg(int reg)
  35 {
  36         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
  37 }
  38 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
  39 static inline void set_debugreg(unsigned long val, int reg)
  40 {
  41         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
  42 }
  43
  44 static inline unsigned long read_cr0(void)
  45 {
  46         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
  47 }
  48
  49 static inline void write_cr0(unsigned long x)
  50 {
  51         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
  52 }
  53
  54 static inline unsigned long read_cr2(void)
  55 {
  56         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
  57 }
  58
  59 static inline void write_cr2(unsigned long x)
  60 {
  61         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
  62 }
  63
  64 static inline unsigned long __read_cr3(void)
  65 {
  66         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
  67 }
  68
  69 static inline void write_cr3(unsigned long x)
  70 {
  71         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
  72 }
  73
  74 static inline unsigned long __read_cr4(void)
  75 {
  76         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
  77 }
  78
  79 static inline void __write_cr4(unsigned long x)
  80 {
  81         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
  82 }
  83
  84 #ifdef CONFIG_X86_64
  85 static inline unsigned long read_cr8(void)
  86 {
  87         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
  88 }
  89
  90 static inline void write_cr8(unsigned long x)
  91 {
  92         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
  93 }
  94 #endif
  95
  96 static inline void arch_safe_halt(void)
  97 {
  98         PVOP_VCALL0(pv_irq_ops.safe_halt);
  99 }
 100
 101 static inline void halt(void)
 102 {
 103         PVOP_VCALL0(pv_irq_ops.halt);
 104 }
 105
 106 static inline void wbinvd(void)
 107 {
 108         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 109 }
 110
 111 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 112
 113 static inline u64 paravirt_read_msr(unsigned msr)
 114 {
 115         return PVOP_CALL1(u64, pv_cpu_ops.read_msr, msr);
 116 }
 117
 118 static inline void paravirt_write_msr(unsigned msr,
 119                                       unsigned low, unsigned high)
 120 {
 121         PVOP_VCALL3(pv_cpu_ops.write_msr, msr, low, high);
 122 }
 123
 124 static inline u64 paravirt_read_msr_safe(unsigned msr, int *err)
 125 {
 126         return PVOP_CALL2(u64, pv_cpu_ops.read_msr_safe, msr, err);
 127 }
 128
 129 static inline int paravirt_write_msr_safe(unsigned msr,
 130                                           unsigned low, unsigned high)
 131 {
 132         return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high);
 133 }
 134
 135 #define rdmsr(msr, val1, val2)                  \
 136 do {                                            \
 137         u64 _l = paravirt_read_msr(msr);        \
 138         val1 = (u32)_l;                         \
 139         val2 = _l >> 32;                        \
 140 } while (0)
 141
 142 #define wrmsr(msr, val1, val2)                  \
 143 do {                                            \
 144         paravirt_write_msr(msr, val1, val2);    \
 145 } while (0)
 146
 147 #define rdmsrl(msr, val)                        \
 148 do {                                            \
 149         val = paravirt_read_msr(msr);           \
 150 } while (0)
 151
 152 static inline void wrmsrl(unsigned msr, u64 val)
 153 {
 154         wrmsr(msr, (u32)val, (u32)(val>>32));
 155 }
 156
 157 #define wrmsr_safe(msr, a, b)   paravirt_write_msr_safe(msr, a, b)
 158
 159 /* rdmsr with exception handling */
 160 #define rdmsr_safe(msr, a, b)                           \
 161 ({                                                      \
 162         int _err;                                       \
 163         u64 _l = paravirt_read_msr_safe(msr, &_err);    \
 164         (*a) = (u32)_l;                                 \
 165         (*b) = _l >> 32;                                \
 166         _err;                                           \
 167 })
 168
 169 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 170 {
 171         int err;
 172
 173         *p = paravirt_read_msr_safe(msr, &err);
 174         return err;
 175 }
 176
 177 static inline unsigned long long paravirt_sched_clock(void)
 178 {
 179         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 180 }
 181
 182 struct static_key;
 183 extern struct static_key paravirt_steal_enabled;
 184 extern struct static_key paravirt_steal_rq_enabled;
 185
 186 static inline u64 paravirt_steal_clock(int cpu)
 187 {
 188         return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
 189 }
 190
 191 static inline unsigned long long paravirt_read_pmc(int counter)
 192 {
 193         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 194 }
 195
 196 #define rdpmc(counter, low, high)               \
 197 do {                                            \
 198         u64 _l = paravirt_read_pmc(counter);    \
 199         low = (u32)_l;                          \
 200         high = _l >> 32;                        \
 201 } while (0)
 202
 203 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
 204
 205 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 206 {
 207         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 208 }
 209
 210 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 211 {
 212         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 213 }
 214
 215 static inline void load_TR_desc(void)
 216 {
 217         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 218 }
 219 static inline void load_gdt(const struct desc_ptr *dtr)
 220 {
 221         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 222 }
 223 static inline void load_idt(const struct desc_ptr *dtr)
 224 {
 225         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 226 }
 227 static inline void set_ldt(const void *addr, unsigned entries)
 228 {
 229         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 230 }
 231 static inline void store_idt(struct desc_ptr *dtr)
 232 {
 233         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 234 }
 235 static inline unsigned long paravirt_store_tr(void)
 236 {
 237         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 238 }
 239 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 240 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 241 {
 242         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 243 }
 244
 245 #ifdef CONFIG_X86_64
 246 static inline void load_gs_index(unsigned int gs)
 247 {
 248         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 249 }
 250 #endif
 251
 252 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 253                                    const void *desc)
 254 {
 255         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 256 }
 257
 258 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 259                                    void *desc, int type)
 260 {
 261         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 262 }
 263
 264 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 265 {
 266         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 267 }
 268 static inline void set_iopl_mask(unsigned mask)
 269 {
 270         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 271 }
 272
 273 /* The paravirtualized I/O functions */
 274 static inline void slow_down_io(void)
 275 {
 276         pv_cpu_ops.io_delay();
 277 #ifdef REALLY_SLOW_IO
 278         pv_cpu_ops.io_delay();
 279         pv_cpu_ops.io_delay();
 280         pv_cpu_ops.io_delay();
 281 #endif
 282 }
 283
 284 static inline void paravirt_activate_mm(struct mm_struct *prev,
 285                                         struct mm_struct *next)
 286 {
 287         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 288 }
 289
 290 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 291                                           struct mm_struct *mm)
 292 {
 293         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 294 }
 295
 296 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 297 {
 298         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 299 }
 300
 301 static inline void __flush_tlb(void)
 302 {
 303         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 304 }
 305 static inline void __flush_tlb_global(void)
 306 {
 307         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 308 }
 309 static inline void __flush_tlb_single(unsigned long addr)
 310 {
 311         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 312 }
 313
 314 static inline void flush_tlb_others(const struct cpumask *cpumask,
 315                                     const struct flush_tlb_info *info)
 316 {
 317         PVOP_VCALL2(pv_mmu_ops.flush_tlb_others, cpumask, info);
 318 }
 319
 320 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 321 {
 322         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 323 }
 324
 325 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 326 {
 327         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 328 }
 329
 330 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 331 {
 332         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 333 }
 334 static inline void paravirt_release_pte(unsigned long pfn)
 335 {
 336         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 337 }
 338
 339 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 340 {
 341         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 342 }
 343
 344 static inline void paravirt_release_pmd(unsigned long pfn)
 345 {
 346         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 347 }
 348
 349 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 350 {
 351         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 352 }
 353 static inline void paravirt_release_pud(unsigned long pfn)
 354 {
 355         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 356 }
 357
 358 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)
 359 {
 360         PVOP_VCALL2(pv_mmu_ops.alloc_p4d, mm, pfn);
 361 }
 362
 363 static inline void paravirt_release_p4d(unsigned long pfn)
 364 {
 365         PVOP_VCALL1(pv_mmu_ops.release_p4d, pfn);
 366 }
 367
 368 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 369                               pte_t *ptep)
 370 {
 371         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 372 }
 373
 374 static inline pte_t __pte(pteval_t val)
 375 {
 376         pteval_t ret;
 377
 378         if (sizeof(pteval_t) > sizeof(long))
 379                 ret = PVOP_CALLEE2(pteval_t,
 380                                    pv_mmu_ops.make_pte,
 381                                    val, (u64)val >> 32);
 382         else
 383                 ret = PVOP_CALLEE1(pteval_t,
 384                                    pv_mmu_ops.make_pte,
 385                                    val);
 386
 387         return (pte_t) { .pte = ret };
 388 }
 389
 390 static inline pteval_t pte_val(pte_t pte)
 391 {
 392         pteval_t ret;
 393
 394         if (sizeof(pteval_t) > sizeof(long))
 395                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 396                                    pte.pte, (u64)pte.pte >> 32);
 397         else
 398                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 399                                    pte.pte);
 400
 401         return ret;
 402 }
 403
 404 static inline pgd_t __pgd(pgdval_t val)
 405 {
 406         pgdval_t ret;
 407
 408         if (sizeof(pgdval_t) > sizeof(long))
 409                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 410                                    val, (u64)val >> 32);
 411         else
 412                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 413                                    val);
 414
 415         return (pgd_t) { ret };
 416 }
 417
 418 static inline pgdval_t pgd_val(pgd_t pgd)
 419 {
 420         pgdval_t ret;
 421
 422         if (sizeof(pgdval_t) > sizeof(long))
 423                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 424                                     pgd.pgd, (u64)pgd.pgd >> 32);
 425         else
 426                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 427                                     pgd.pgd);
 428
 429         return ret;
 430 }
 431
 432 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 433 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 434                                            pte_t *ptep)
 435 {
 436         pteval_t ret;
 437
 438         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 439                          mm, addr, ptep);
 440
 441         return (pte_t) { .pte = ret };
 442 }
 443
 444 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 445                                            pte_t *ptep, pte_t pte)
 446 {
 447         if (sizeof(pteval_t) > sizeof(long))
 448                 /* 5 arg words */
 449                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 450         else
 451                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 452                             mm, addr, ptep, pte.pte);
 453 }
 454
 455 static inline void set_pte(pte_t *ptep, pte_t pte)
 456 {
 457         if (sizeof(pteval_t) > sizeof(long))
 458                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 459                             pte.pte, (u64)pte.pte >> 32);
 460         else
 461                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 462                             pte.pte);
 463 }
 464
 465 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 466                               pte_t *ptep, pte_t pte)
 467 {
 468         if (sizeof(pteval_t) > sizeof(long))
 469                 /* 5 arg words */
 470                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 471         else
 472                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 473 }
 474
 475 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 476                               pmd_t *pmdp, pmd_t pmd)
 477 {
 478         if (sizeof(pmdval_t) > sizeof(long))
 479                 /* 5 arg words */
 480                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
 481         else
 482                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
 483                             native_pmd_val(pmd));
 484 }
 485
 486 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
 487                               pud_t *pudp, pud_t pud)
 488 {
 489         if (sizeof(pudval_t) > sizeof(long))
 490                 /* 5 arg words */
 491                 pv_mmu_ops.set_pud_at(mm, addr, pudp, pud);
 492         else
 493                 PVOP_VCALL4(pv_mmu_ops.set_pud_at, mm, addr, pudp,
 494                             native_pud_val(pud));
 495 }
 496
 497 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 498 {
 499         pmdval_t val = native_pmd_val(pmd);
 500
 501         if (sizeof(pmdval_t) > sizeof(long))
 502                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 503         else
 504                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 505 }
 506
 507 #if CONFIG_PGTABLE_LEVELS >= 3
 508 static inline pmd_t __pmd(pmdval_t val)
 509 {
 510         pmdval_t ret;
 511
 512         if (sizeof(pmdval_t) > sizeof(long))
 513                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 514                                    val, (u64)val >> 32);
 515         else
 516                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 517                                    val);
 518
 519         return (pmd_t) { ret };
 520 }
 521
 522 static inline pmdval_t pmd_val(pmd_t pmd)
 523 {
 524         pmdval_t ret;
 525
 526         if (sizeof(pmdval_t) > sizeof(long))
 527                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 528                                     pmd.pmd, (u64)pmd.pmd >> 32);
 529         else
 530                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 531                                     pmd.pmd);
 532
 533         return ret;
 534 }
 535
 536 static inline void set_pud(pud_t *pudp, pud_t pud)
 537 {
 538         pudval_t val = native_pud_val(pud);
 539
 540         if (sizeof(pudval_t) > sizeof(long))
 541                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 542                             val, (u64)val >> 32);
 543         else
 544                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 545                             val);
 546 }
 547 #if CONFIG_PGTABLE_LEVELS >= 4
 548 static inline pud_t __pud(pudval_t val)
 549 {
 550         pudval_t ret;
 551
 552         if (sizeof(pudval_t) > sizeof(long))
 553                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 554                                    val, (u64)val >> 32);
 555         else
 556                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 557                                    val);
 558
 559         return (pud_t) { ret };
 560 }
 561
 562 static inline pudval_t pud_val(pud_t pud)
 563 {
 564         pudval_t ret;
 565
 566         if (sizeof(pudval_t) > sizeof(long))
 567                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 568                                     pud.pud, (u64)pud.pud >> 32);
 569         else
 570                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 571                                     pud.pud);
 572
 573         return ret;
 574 }
 575
 576 static inline void pud_clear(pud_t *pudp)
 577 {
 578         set_pud(pudp, __pud(0));
 579 }
 580
 581 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
 582 {
 583         p4dval_t val = native_p4d_val(p4d);
 584
 585         if (sizeof(p4dval_t) > sizeof(long))
 586                 PVOP_VCALL3(pv_mmu_ops.set_p4d, p4dp,
 587                             val, (u64)val >> 32);
 588         else
 589                 PVOP_VCALL2(pv_mmu_ops.set_p4d, p4dp,
 590                             val);
 591 }
 592
 593 #if CONFIG_PGTABLE_LEVELS >= 5
 594
 595 static inline p4d_t __p4d(p4dval_t val)
 596 {
 597         p4dval_t ret = PVOP_CALLEE1(p4dval_t, pv_mmu_ops.make_p4d, val);
 598
 599         return (p4d_t) { ret };
 600 }
 601
 602 static inline p4dval_t p4d_val(p4d_t p4d)
 603 {
 604         return PVOP_CALLEE1(p4dval_t, pv_mmu_ops.p4d_val, p4d.p4d);
 605 }
 606
 607 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 608 {
 609         pgdval_t val = native_pgd_val(pgd);
 610
 611         PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, val);
 612 }
 613
 614 static inline void pgd_clear(pgd_t *pgdp)
 615 {
 616         set_pgd(pgdp, __pgd(0));
 617 }
 618
 619 #endif  /* CONFIG_PGTABLE_LEVELS == 5 */
 620
 621 static inline void p4d_clear(p4d_t *p4dp)
 622 {
 623         set_p4d(p4dp, __p4d(0));
 624 }
 625
 626 #endif  /* CONFIG_PGTABLE_LEVELS == 4 */
 627
 628 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 629
 630 #ifdef CONFIG_X86_PAE
 631 /* Special-case pte-setting operations for PAE, which can't update a
 632    64-bit pte atomically */
 633 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 634 {
 635         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 636                     pte.pte, pte.pte >> 32);
 637 }
 638
 639 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 640                              pte_t *ptep)
 641 {
 642         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 643 }
 644
 645 static inline void pmd_clear(pmd_t *pmdp)
 646 {
 647         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 648 }
 649 #else  /* !CONFIG_X86_PAE */
 650 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 651 {
 652         set_pte(ptep, pte);
 653 }
 654
 655 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 656                              pte_t *ptep)
 657 {
 658         set_pte_at(mm, addr, ptep, __pte(0));
 659 }
 660
 661 static inline void pmd_clear(pmd_t *pmdp)
 662 {
 663         set_pmd(pmdp, __pmd(0));
 664 }
 665 #endif  /* CONFIG_X86_PAE */
 666
 667 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 668 static inline void arch_start_context_switch(struct task_struct *prev)
 669 {
 670         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 671 }
 672
 673 static inline void arch_end_context_switch(struct task_struct *next)
 674 {
 675         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 676 }
 677
 678 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 679 static inline void arch_enter_lazy_mmu_mode(void)
 680 {
 681         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 682 }
 683
 684 static inline void arch_leave_lazy_mmu_mode(void)
 685 {
 686         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 687 }
 688
 689 static inline void arch_flush_lazy_mmu_mode(void)
 690 {
 691         PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
 692 }
 693
 694 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 695                                 phys_addr_t phys, pgprot_t flags)
 696 {
 697         pv_mmu_ops.set_fixmap(idx, phys, flags);
 698 }
 699
 700 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 701
 702 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
 703                                                         u32 val)
 704 {
 705         PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
 706 }
 707
 708 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
 709 {
 710         PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
 711 }
 712
 713 static __always_inline void pv_wait(u8 *ptr, u8 val)
 714 {
 715         PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
 716 }
 717
 718 static __always_inline void pv_kick(int cpu)
 719 {
 720         PVOP_VCALL1(pv_lock_ops.kick, cpu);
 721 }
 722
 723 static __always_inline bool pv_vcpu_is_preempted(long cpu)
 724 {
 725         return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
 726 }
 727
 728 #endif /* SMP && PARAVIRT_SPINLOCKS */
 729
 730 #ifdef CONFIG_X86_32
 731 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 732 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 733
 734 /* save and restore all caller-save registers, except return value */
 735 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 736 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 737
 738 #define PV_FLAGS_ARG "0"
 739 #define PV_EXTRA_CLOBBERS
 740 #define PV_VEXTRA_CLOBBERS
 741 #else
 742 /* save and restore all caller-save registers, except return value */
 743 #define PV_SAVE_ALL_CALLER_REGS                                         \
 744         "push %rcx;"                                                    \
 745         "push %rdx;"                                                    \
 746         "push %rsi;"                                                    \
 747         "push %rdi;"                                                    \
 748         "push %r8;"                                                     \
 749         "push %r9;"                                                     \
 750         "push %r10;"                                                    \
 751         "push %r11;"
 752 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 753         "pop %r11;"                                                     \
 754         "pop %r10;"                                                     \
 755         "pop %r9;"                                                      \
 756         "pop %r8;"                                                      \
 757         "pop %rdi;"                                                     \
 758         "pop %rsi;"                                                     \
 759         "pop %rdx;"                                                     \
 760         "pop %rcx;"
 761
 762 /* We save some registers, but all of them, that's too much. We clobber all
 763  * caller saved registers but the argument parameter */
 764 #define PV_SAVE_REGS "pushq %%rdi;"
 765 #define PV_RESTORE_REGS "popq %%rdi;"
 766 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 767 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 768 #define PV_FLAGS_ARG "D"
 769 #endif
 770
 771 /*
 772  * Generate a thunk around a function which saves all caller-save
 773  * registers except for the return value.  This allows C functions to
 774  * be called from assembler code where fewer than normal registers are
 775  * available.  It may also help code generation around calls from C
 776  * code if the common case doesn't use many registers.
 777  *
 778  * When a callee is wrapped in a thunk, the caller can assume that all
 779  * arg regs and all scratch registers are preserved across the
 780  * call. The return value in rax/eax will not be saved, even for void
 781  * functions.
 782  */
 783 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
 784 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 785         extern typeof(func) __raw_callee_save_##func;                   \
 786                                                                         \
 787         asm(".pushsection .text;"                                       \
 788             ".globl " PV_THUNK_NAME(func) ";"                           \
 789             ".type " PV_THUNK_NAME(func) ", @function;"                 \
 790             PV_THUNK_NAME(func) ":"                                     \
 791             FRAME_BEGIN                                                 \
 792             PV_SAVE_ALL_CALLER_REGS                                     \
 793             "call " #func ";"                                           \
 794             PV_RESTORE_ALL_CALLER_REGS                                  \
 795             FRAME_END                                                   \
 796             "ret;"                                                      \
 797             ".popsection")
 798
 799 /* Get a reference to a callee-save function */
 800 #define PV_CALLEE_SAVE(func)                                            \
 801         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 802
 803 /* Promise that "func" already uses the right calling convention */
 804 #define __PV_IS_CALLEE_SAVE(func)                       \
 805         ((struct paravirt_callee_save) { func })
 806
 807 static inline notrace unsigned long arch_local_save_flags(void)
 808 {
 809         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 810 }
 811
 812 static inline notrace void arch_local_irq_restore(unsigned long f)
 813 {
 814         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 815 }
 816
 817 static inline notrace void arch_local_irq_disable(void)
 818 {
 819         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 820 }
 821
 822 static inline notrace void arch_local_irq_enable(void)
 823 {
 824         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 825 }
 826
 827 static inline notrace unsigned long arch_local_irq_save(void)
 828 {
 829         unsigned long f;
 830
 831         f = arch_local_save_flags();
 832         arch_local_irq_disable();
 833         return f;
 834 }
 835
 836
 837 /* Make sure as little as possible of this mess escapes. */
 838 #undef PARAVIRT_CALL
 839 #undef __PVOP_CALL
 840 #undef __PVOP_VCALL
 841 #undef PVOP_VCALL0
 842 #undef PVOP_CALL0
 843 #undef PVOP_VCALL1
 844 #undef PVOP_CALL1
 845 #undef PVOP_VCALL2
 846 #undef PVOP_CALL2
 847 #undef PVOP_VCALL3
 848 #undef PVOP_CALL3
 849 #undef PVOP_VCALL4
 850 #undef PVOP_CALL4
 851
 852 extern void default_banner(void);
 853
 854 #else  /* __ASSEMBLY__ */
 855
 856 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 857 771:;                                           \
 858         ops;                                    \
 859 772:;                                           \
 860         .pushsection .parainstructions,"a";     \
 861          .align algn;                           \
 862          word 771b;                             \
 863          .byte ptype;                           \
 864          .byte 772b-771b;                       \
 865          .short clobbers;                       \
 866         .popsection
 867
 868
 869 #define COND_PUSH(set, mask, reg)                       \
 870         .if ((~(set)) & mask); push %reg; .endif
 871 #define COND_POP(set, mask, reg)                        \
 872         .if ((~(set)) & mask); pop %reg; .endif
 873
 874 #ifdef CONFIG_X86_64
 875
 876 #define PV_SAVE_REGS(set)                       \
 877         COND_PUSH(set, CLBR_RAX, rax);          \
 878         COND_PUSH(set, CLBR_RCX, rcx);          \
 879         COND_PUSH(set, CLBR_RDX, rdx);          \
 880         COND_PUSH(set, CLBR_RSI, rsi);          \
 881         COND_PUSH(set, CLBR_RDI, rdi);          \
 882         COND_PUSH(set, CLBR_R8, r8);            \
 883         COND_PUSH(set, CLBR_R9, r9);            \
 884         COND_PUSH(set, CLBR_R10, r10);          \
 885         COND_PUSH(set, CLBR_R11, r11)
 886 #define PV_RESTORE_REGS(set)                    \
 887         COND_POP(set, CLBR_R11, r11);           \
 888         COND_POP(set, CLBR_R10, r10);           \
 889         COND_POP(set, CLBR_R9, r9);             \
 890         COND_POP(set, CLBR_R8, r8);             \
 891         COND_POP(set, CLBR_RDI, rdi);           \
 892         COND_POP(set, CLBR_RSI, rsi);           \
 893         COND_POP(set, CLBR_RDX, rdx);           \
 894         COND_POP(set, CLBR_RCX, rcx);           \
 895         COND_POP(set, CLBR_RAX, rax)
 896
 897 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 898 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 899 #define PARA_INDIRECT(addr)     *addr(%rip)
 900 #else
 901 #define PV_SAVE_REGS(set)                       \
 902         COND_PUSH(set, CLBR_EAX, eax);          \
 903         COND_PUSH(set, CLBR_EDI, edi);          \
 904         COND_PUSH(set, CLBR_ECX, ecx);          \
 905         COND_PUSH(set, CLBR_EDX, edx)
 906 #define PV_RESTORE_REGS(set)                    \
 907         COND_POP(set, CLBR_EDX, edx);           \
 908         COND_POP(set, CLBR_ECX, ecx);           \
 909         COND_POP(set, CLBR_EDI, edi);           \
 910         COND_POP(set, CLBR_EAX, eax)
 911
 912 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 913 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 914 #define PARA_INDIRECT(addr)     *%cs:addr
 915 #endif
 916
 917 #define INTERRUPT_RETURN                                                \
 918         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 919                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 920
 921 #define DISABLE_INTERRUPTS(clobbers)                                    \
 922         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 923                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 924                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 925                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 926
 927 #define ENABLE_INTERRUPTS(clobbers)                                     \
 928         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 929                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 930                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 931                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 932
 933 #ifdef CONFIG_X86_32
 934 #define GET_CR0_INTO_EAX                                \
 935         push %ecx; push %edx;                           \
 936         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 937         pop %edx; pop %ecx
 938 #else   /* !CONFIG_X86_32 */
 939
 940 /*
 941  * If swapgs is used while the userspace stack is still current,
 942  * there's no way to call a pvop.  The PV replacement *must* be
 943  * inlined, or the swapgs instruction must be trapped and emulated.
 944  */
 945 #define SWAPGS_UNSAFE_STACK                                             \
 946         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 947                   swapgs)
 948
 949 /*
 950  * Note: swapgs is very special, and in practise is either going to be
 951  * implemented with a single "swapgs" instruction or something very
 952  * special.  Either way, we don't need to save any registers for
 953  * it.
 954  */
 955 #define SWAPGS                                                          \
 956         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 957                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
 958                  )
 959
 960 #define GET_CR2_INTO_RAX                                \
 961         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
 962
 963 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
 964         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
 965                   CLBR_NONE,                                            \
 966                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
 967
 968 #define USERGS_SYSRET64                                                 \
 969         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
 970                   CLBR_NONE,                                            \
 971                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
 972 #endif  /* CONFIG_X86_32 */
 973
 974 #endif /* __ASSEMBLY__ */
 975 #else  /* CONFIG_PARAVIRT */
 976 # define default_banner x86_init_noop
 977 #ifndef __ASSEMBLY__
 978 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 979                                           struct mm_struct *mm)
 980 {
 981 }
 982
 983 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 984 {
 985 }
 986 #endif /* __ASSEMBLY__ */
 987 #endif /* !CONFIG_PARAVIRT */
 988 #endif /* _ASM_X86_PARAVIRT_H */