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
  17 static inline int paravirt_enabled(void)
  18 {
  19         return pv_info.paravirt_enabled;
  20 }
  21
  22 static inline void load_sp0(struct tss_struct *tss,
  23                              struct thread_struct *thread)
  24 {
  25         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
  26 }
  27
  28 /* The paravirtualized CPUID instruction. */
  29 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
  30                            unsigned int *ecx, unsigned int *edx)
  31 {
  32         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
  33 }
  34
  35 /*
  36  * These special macros can be used to get or set a debugging register
  37  */
  38 static inline unsigned long paravirt_get_debugreg(int reg)
  39 {
  40         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
  41 }
  42 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
  43 static inline void set_debugreg(unsigned long val, int reg)
  44 {
  45         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
  46 }
  47
  48 static inline void clts(void)
  49 {
  50         PVOP_VCALL0(pv_cpu_ops.clts);
  51 }
  52
  53 static inline unsigned long read_cr0(void)
  54 {
  55         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
  56 }
  57
  58 static inline void write_cr0(unsigned long x)
  59 {
  60         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
  61 }
  62
  63 static inline unsigned long read_cr2(void)
  64 {
  65         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
  66 }
  67
  68 static inline void write_cr2(unsigned long x)
  69 {
  70         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
  71 }
  72
  73 static inline unsigned long read_cr3(void)
  74 {
  75         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
  76 }
  77
  78 static inline void write_cr3(unsigned long x)
  79 {
  80         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
  81 }
  82
  83 static inline unsigned long read_cr4(void)
  84 {
  85         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
  86 }
  87 static inline unsigned long read_cr4_safe(void)
  88 {
  89         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
  90 }
  91
  92 static inline void write_cr4(unsigned long x)
  93 {
  94         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
  95 }
  96
  97 #ifdef CONFIG_X86_64
  98 static inline unsigned long read_cr8(void)
  99 {
 100         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
 101 }
 102
 103 static inline void write_cr8(unsigned long x)
 104 {
 105         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
 106 }
 107 #endif
 108
 109 static inline void arch_safe_halt(void)
 110 {
 111         PVOP_VCALL0(pv_irq_ops.safe_halt);
 112 }
 113
 114 static inline void halt(void)
 115 {
 116         PVOP_VCALL0(pv_irq_ops.halt);
 117 }
 118
 119 static inline void wbinvd(void)
 120 {
 121         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 122 }
 123
 124 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 125
 126 static inline u64 paravirt_read_msr(unsigned msr, int *err)
 127 {
 128         return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
 129 }
 130
 131 static inline int paravirt_rdmsr_regs(u32 *regs)
 132 {
 133         return PVOP_CALL1(int, pv_cpu_ops.rdmsr_regs, regs);
 134 }
 135
 136 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
 137 {
 138         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
 139 }
 140
 141 static inline int paravirt_wrmsr_regs(u32 *regs)
 142 {
 143         return PVOP_CALL1(int, pv_cpu_ops.wrmsr_regs, regs);
 144 }
 145
 146 /* These should all do BUG_ON(_err), but our headers are too tangled. */
 147 #define rdmsr(msr, val1, val2)                  \
 148 do {                                            \
 149         int _err;                               \
 150         u64 _l = paravirt_read_msr(msr, &_err); \
 151         val1 = (u32)_l;                         \
 152         val2 = _l >> 32;                        \
 153 } while (0)
 154
 155 #define wrmsr(msr, val1, val2)                  \
 156 do {                                            \
 157         paravirt_write_msr(msr, val1, val2);    \
 158 } while (0)
 159
 160 #define rdmsrl(msr, val)                        \
 161 do {                                            \
 162         int _err;                               \
 163         val = paravirt_read_msr(msr, &_err);    \
 164 } while (0)
 165
 166 #define wrmsrl(msr, val)        wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
 167 #define wrmsr_safe(msr, a, b)   paravirt_write_msr(msr, a, b)
 168
 169 /* rdmsr with exception handling */
 170 #define rdmsr_safe(msr, a, b)                   \
 171 ({                                              \
 172         int _err;                               \
 173         u64 _l = paravirt_read_msr(msr, &_err); \
 174         (*a) = (u32)_l;                         \
 175         (*b) = _l >> 32;                        \
 176         _err;                                   \
 177 })
 178
 179 #define rdmsr_safe_regs(regs)   paravirt_rdmsr_regs(regs)
 180 #define wrmsr_safe_regs(regs)   paravirt_wrmsr_regs(regs)
 181
 182 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 183 {
 184         int err;
 185
 186         *p = paravirt_read_msr(msr, &err);
 187         return err;
 188 }
 189 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
 190 {
 191         u32 gprs[8] = { 0 };
 192         int err;
 193
 194         gprs[1] = msr;
 195         gprs[7] = 0x9c5a203a;
 196
 197         err = paravirt_rdmsr_regs(gprs);
 198
 199         *p = gprs[0] | ((u64)gprs[2] << 32);
 200
 201         return err;
 202 }
 203
 204 static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)
 205 {
 206         u32 gprs[8] = { 0 };
 207
 208         gprs[0] = (u32)val;
 209         gprs[1] = msr;
 210         gprs[2] = val >> 32;
 211         gprs[7] = 0x9c5a203a;
 212
 213         return paravirt_wrmsr_regs(gprs);
 214 }
 215
 216 static inline u64 paravirt_read_tsc(void)
 217 {
 218         return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
 219 }
 220
 221 #define rdtscl(low)                             \
 222 do {                                            \
 223         u64 _l = paravirt_read_tsc();           \
 224         low = (int)_l;                          \
 225 } while (0)
 226
 227 #define rdtscll(val) (val = paravirt_read_tsc())
 228
 229 static inline unsigned long long paravirt_sched_clock(void)
 230 {
 231         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 232 }
 233
 234 struct static_key;
 235 extern struct static_key paravirt_steal_enabled;
 236 extern struct static_key paravirt_steal_rq_enabled;
 237
 238 static inline u64 paravirt_steal_clock(int cpu)
 239 {
 240         return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
 241 }
 242
 243 static inline unsigned long long paravirt_read_pmc(int counter)
 244 {
 245         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 246 }
 247
 248 #define rdpmc(counter, low, high)               \
 249 do {                                            \
 250         u64 _l = paravirt_read_pmc(counter);    \
 251         low = (u32)_l;                          \
 252         high = _l >> 32;                        \
 253 } while (0)
 254
 255 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
 256 {
 257         return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
 258 }
 259
 260 #define rdtscp(low, high, aux)                          \
 261 do {                                                    \
 262         int __aux;                                      \
 263         unsigned long __val = paravirt_rdtscp(&__aux);  \
 264         (low) = (u32)__val;                             \
 265         (high) = (u32)(__val >> 32);                    \
 266         (aux) = __aux;                                  \
 267 } while (0)
 268
 269 #define rdtscpll(val, aux)                              \
 270 do {                                                    \
 271         unsigned long __aux;                            \
 272         val = paravirt_rdtscp(&__aux);                  \
 273         (aux) = __aux;                                  \
 274 } while (0)
 275
 276 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 277 {
 278         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 279 }
 280
 281 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 282 {
 283         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 284 }
 285
 286 static inline void load_TR_desc(void)
 287 {
 288         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 289 }
 290 static inline void load_gdt(const struct desc_ptr *dtr)
 291 {
 292         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 293 }
 294 static inline void load_idt(const struct desc_ptr *dtr)
 295 {
 296         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 297 }
 298 static inline void set_ldt(const void *addr, unsigned entries)
 299 {
 300         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 301 }
 302 static inline void store_gdt(struct desc_ptr *dtr)
 303 {
 304         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
 305 }
 306 static inline void store_idt(struct desc_ptr *dtr)
 307 {
 308         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 309 }
 310 static inline unsigned long paravirt_store_tr(void)
 311 {
 312         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 313 }
 314 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 315 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 316 {
 317         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 318 }
 319
 320 #ifdef CONFIG_X86_64
 321 static inline void load_gs_index(unsigned int gs)
 322 {
 323         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 324 }
 325 #endif
 326
 327 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 328                                    const void *desc)
 329 {
 330         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 331 }
 332
 333 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 334                                    void *desc, int type)
 335 {
 336         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 337 }
 338
 339 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 340 {
 341         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 342 }
 343 static inline void set_iopl_mask(unsigned mask)
 344 {
 345         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 346 }
 347
 348 /* The paravirtualized I/O functions */
 349 static inline void slow_down_io(void)
 350 {
 351         pv_cpu_ops.io_delay();
 352 #ifdef REALLY_SLOW_IO
 353         pv_cpu_ops.io_delay();
 354         pv_cpu_ops.io_delay();
 355         pv_cpu_ops.io_delay();
 356 #endif
 357 }
 358
 359 #ifdef CONFIG_SMP
 360 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
 361                                     unsigned long start_esp)
 362 {
 363         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
 364                     phys_apicid, start_eip, start_esp);
 365 }
 366 #endif
 367
 368 static inline void paravirt_activate_mm(struct mm_struct *prev,
 369                                         struct mm_struct *next)
 370 {
 371         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 372 }
 373
 374 static inline void arch_dup_mmap(struct mm_struct *oldmm,
 375                                  struct mm_struct *mm)
 376 {
 377         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 378 }
 379
 380 static inline void arch_exit_mmap(struct mm_struct *mm)
 381 {
 382         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 383 }
 384
 385 static inline void __flush_tlb(void)
 386 {
 387         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 388 }
 389 static inline void __flush_tlb_global(void)
 390 {
 391         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 392 }
 393 static inline void __flush_tlb_single(unsigned long addr)
 394 {
 395         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 396 }
 397
 398 static inline void flush_tlb_others(const struct cpumask *cpumask,
 399                                     struct mm_struct *mm,
 400                                     unsigned long va)
 401 {
 402         PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, cpumask, mm, va);
 403 }
 404
 405 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 406 {
 407         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 408 }
 409
 410 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 411 {
 412         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 413 }
 414
 415 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 416 {
 417         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 418 }
 419 static inline void paravirt_release_pte(unsigned long pfn)
 420 {
 421         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 422 }
 423
 424 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 425 {
 426         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 427 }
 428
 429 static inline void paravirt_release_pmd(unsigned long pfn)
 430 {
 431         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 432 }
 433
 434 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 435 {
 436         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 437 }
 438 static inline void paravirt_release_pud(unsigned long pfn)
 439 {
 440         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 441 }
 442
 443 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 444                               pte_t *ptep)
 445 {
 446         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 447 }
 448 static inline void pmd_update(struct mm_struct *mm, unsigned long addr,
 449                               pmd_t *pmdp)
 450 {
 451         PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp);
 452 }
 453
 454 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
 455                                     pte_t *ptep)
 456 {
 457         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
 458 }
 459
 460 static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr,
 461                                     pmd_t *pmdp)
 462 {
 463         PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp);
 464 }
 465
 466 static inline pte_t __pte(pteval_t val)
 467 {
 468         pteval_t ret;
 469
 470         if (sizeof(pteval_t) > sizeof(long))
 471                 ret = PVOP_CALLEE2(pteval_t,
 472                                    pv_mmu_ops.make_pte,
 473                                    val, (u64)val >> 32);
 474         else
 475                 ret = PVOP_CALLEE1(pteval_t,
 476                                    pv_mmu_ops.make_pte,
 477                                    val);
 478
 479         return (pte_t) { .pte = ret };
 480 }
 481
 482 static inline pteval_t pte_val(pte_t pte)
 483 {
 484         pteval_t ret;
 485
 486         if (sizeof(pteval_t) > sizeof(long))
 487                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 488                                    pte.pte, (u64)pte.pte >> 32);
 489         else
 490                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 491                                    pte.pte);
 492
 493         return ret;
 494 }
 495
 496 static inline pgd_t __pgd(pgdval_t val)
 497 {
 498         pgdval_t ret;
 499
 500         if (sizeof(pgdval_t) > sizeof(long))
 501                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 502                                    val, (u64)val >> 32);
 503         else
 504                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 505                                    val);
 506
 507         return (pgd_t) { ret };
 508 }
 509
 510 static inline pgdval_t pgd_val(pgd_t pgd)
 511 {
 512         pgdval_t ret;
 513
 514         if (sizeof(pgdval_t) > sizeof(long))
 515                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 516                                     pgd.pgd, (u64)pgd.pgd >> 32);
 517         else
 518                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 519                                     pgd.pgd);
 520
 521         return ret;
 522 }
 523
 524 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 525 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 526                                            pte_t *ptep)
 527 {
 528         pteval_t ret;
 529
 530         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 531                          mm, addr, ptep);
 532
 533         return (pte_t) { .pte = ret };
 534 }
 535
 536 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 537                                            pte_t *ptep, pte_t pte)
 538 {
 539         if (sizeof(pteval_t) > sizeof(long))
 540                 /* 5 arg words */
 541                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 542         else
 543                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 544                             mm, addr, ptep, pte.pte);
 545 }
 546
 547 static inline void set_pte(pte_t *ptep, pte_t pte)
 548 {
 549         if (sizeof(pteval_t) > sizeof(long))
 550                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 551                             pte.pte, (u64)pte.pte >> 32);
 552         else
 553                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 554                             pte.pte);
 555 }
 556
 557 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 558                               pte_t *ptep, pte_t pte)
 559 {
 560         if (sizeof(pteval_t) > sizeof(long))
 561                 /* 5 arg words */
 562                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 563         else
 564                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 565 }
 566
 567 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 568 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 569                               pmd_t *pmdp, pmd_t pmd)
 570 {
 571         if (sizeof(pmdval_t) > sizeof(long))
 572                 /* 5 arg words */
 573                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
 574         else
 575                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
 576                             native_pmd_val(pmd));
 577 }
 578 #endif
 579
 580 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 581 {
 582         pmdval_t val = native_pmd_val(pmd);
 583
 584         if (sizeof(pmdval_t) > sizeof(long))
 585                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 586         else
 587                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 588 }
 589
 590 #if PAGETABLE_LEVELS >= 3
 591 static inline pmd_t __pmd(pmdval_t val)
 592 {
 593         pmdval_t ret;
 594
 595         if (sizeof(pmdval_t) > sizeof(long))
 596                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 597                                    val, (u64)val >> 32);
 598         else
 599                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 600                                    val);
 601
 602         return (pmd_t) { ret };
 603 }
 604
 605 static inline pmdval_t pmd_val(pmd_t pmd)
 606 {
 607         pmdval_t ret;
 608
 609         if (sizeof(pmdval_t) > sizeof(long))
 610                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 611                                     pmd.pmd, (u64)pmd.pmd >> 32);
 612         else
 613                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 614                                     pmd.pmd);
 615
 616         return ret;
 617 }
 618
 619 static inline void set_pud(pud_t *pudp, pud_t pud)
 620 {
 621         pudval_t val = native_pud_val(pud);
 622
 623         if (sizeof(pudval_t) > sizeof(long))
 624                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 625                             val, (u64)val >> 32);
 626         else
 627                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 628                             val);
 629 }
 630 #if PAGETABLE_LEVELS == 4
 631 static inline pud_t __pud(pudval_t val)
 632 {
 633         pudval_t ret;
 634
 635         if (sizeof(pudval_t) > sizeof(long))
 636                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 637                                    val, (u64)val >> 32);
 638         else
 639                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 640                                    val);
 641
 642         return (pud_t) { ret };
 643 }
 644
 645 static inline pudval_t pud_val(pud_t pud)
 646 {
 647         pudval_t ret;
 648
 649         if (sizeof(pudval_t) > sizeof(long))
 650                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 651                                     pud.pud, (u64)pud.pud >> 32);
 652         else
 653                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 654                                     pud.pud);
 655
 656         return ret;
 657 }
 658
 659 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 660 {
 661         pgdval_t val = native_pgd_val(pgd);
 662
 663         if (sizeof(pgdval_t) > sizeof(long))
 664                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
 665                             val, (u64)val >> 32);
 666         else
 667                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
 668                             val);
 669 }
 670
 671 static inline void pgd_clear(pgd_t *pgdp)
 672 {
 673         set_pgd(pgdp, __pgd(0));
 674 }
 675
 676 static inline void pud_clear(pud_t *pudp)
 677 {
 678         set_pud(pudp, __pud(0));
 679 }
 680
 681 #endif  /* PAGETABLE_LEVELS == 4 */
 682
 683 #endif  /* PAGETABLE_LEVELS >= 3 */
 684
 685 #ifdef CONFIG_X86_PAE
 686 /* Special-case pte-setting operations for PAE, which can't update a
 687    64-bit pte atomically */
 688 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 689 {
 690         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 691                     pte.pte, pte.pte >> 32);
 692 }
 693
 694 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 695                              pte_t *ptep)
 696 {
 697         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 698 }
 699
 700 static inline void pmd_clear(pmd_t *pmdp)
 701 {
 702         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 703 }
 704 #else  /* !CONFIG_X86_PAE */
 705 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 706 {
 707         set_pte(ptep, pte);
 708 }
 709
 710 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 711                              pte_t *ptep)
 712 {
 713         set_pte_at(mm, addr, ptep, __pte(0));
 714 }
 715
 716 static inline void pmd_clear(pmd_t *pmdp)
 717 {
 718         set_pmd(pmdp, __pmd(0));
 719 }
 720 #endif  /* CONFIG_X86_PAE */
 721
 722 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 723 static inline void arch_start_context_switch(struct task_struct *prev)
 724 {
 725         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 726 }
 727
 728 static inline void arch_end_context_switch(struct task_struct *next)
 729 {
 730         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 731 }
 732
 733 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 734 static inline void arch_enter_lazy_mmu_mode(void)
 735 {
 736         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 737 }
 738
 739 static inline void arch_leave_lazy_mmu_mode(void)
 740 {
 741         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 742 }
 743
 744 void arch_flush_lazy_mmu_mode(void);
 745
 746 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 747                                 phys_addr_t phys, pgprot_t flags)
 748 {
 749         pv_mmu_ops.set_fixmap(idx, phys, flags);
 750 }
 751
 752 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 753
 754 static inline int arch_spin_is_locked(struct arch_spinlock *lock)
 755 {
 756         return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock);
 757 }
 758
 759 static inline int arch_spin_is_contended(struct arch_spinlock *lock)
 760 {
 761         return PVOP_CALL1(int, pv_lock_ops.spin_is_contended, lock);
 762 }
 763 #define arch_spin_is_contended  arch_spin_is_contended
 764
 765 static __always_inline void arch_spin_lock(struct arch_spinlock *lock)
 766 {
 767         PVOP_VCALL1(pv_lock_ops.spin_lock, lock);
 768 }
 769
 770 static __always_inline void arch_spin_lock_flags(struct arch_spinlock *lock,
 771                                                   unsigned long flags)
 772 {
 773         PVOP_VCALL2(pv_lock_ops.spin_lock_flags, lock, flags);
 774 }
 775
 776 static __always_inline int arch_spin_trylock(struct arch_spinlock *lock)
 777 {
 778         return PVOP_CALL1(int, pv_lock_ops.spin_trylock, lock);
 779 }
 780
 781 static __always_inline void arch_spin_unlock(struct arch_spinlock *lock)
 782 {
 783         PVOP_VCALL1(pv_lock_ops.spin_unlock, lock);
 784 }
 785
 786 #endif
 787
 788 #ifdef CONFIG_X86_32
 789 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 790 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 791
 792 /* save and restore all caller-save registers, except return value */
 793 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 794 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 795
 796 #define PV_FLAGS_ARG "0"
 797 #define PV_EXTRA_CLOBBERS
 798 #define PV_VEXTRA_CLOBBERS
 799 #else
 800 /* save and restore all caller-save registers, except return value */
 801 #define PV_SAVE_ALL_CALLER_REGS                                         \
 802         "push %rcx;"                                                    \
 803         "push %rdx;"                                                    \
 804         "push %rsi;"                                                    \
 805         "push %rdi;"                                                    \
 806         "push %r8;"                                                     \
 807         "push %r9;"                                                     \
 808         "push %r10;"                                                    \
 809         "push %r11;"
 810 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 811         "pop %r11;"                                                     \
 812         "pop %r10;"                                                     \
 813         "pop %r9;"                                                      \
 814         "pop %r8;"                                                      \
 815         "pop %rdi;"                                                     \
 816         "pop %rsi;"                                                     \
 817         "pop %rdx;"                                                     \
 818         "pop %rcx;"
 819
 820 /* We save some registers, but all of them, that's too much. We clobber all
 821  * caller saved registers but the argument parameter */
 822 #define PV_SAVE_REGS "pushq %%rdi;"
 823 #define PV_RESTORE_REGS "popq %%rdi;"
 824 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 825 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 826 #define PV_FLAGS_ARG "D"
 827 #endif
 828
 829 /*
 830  * Generate a thunk around a function which saves all caller-save
 831  * registers except for the return value.  This allows C functions to
 832  * be called from assembler code where fewer than normal registers are
 833  * available.  It may also help code generation around calls from C
 834  * code if the common case doesn't use many registers.
 835  *
 836  * When a callee is wrapped in a thunk, the caller can assume that all
 837  * arg regs and all scratch registers are preserved across the
 838  * call. The return value in rax/eax will not be saved, even for void
 839  * functions.
 840  */
 841 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 842         extern typeof(func) __raw_callee_save_##func;                   \
 843         static void *__##func##__ __used = func;                        \
 844                                                                         \
 845         asm(".pushsection .text;"                                       \
 846             "__raw_callee_save_" #func ": "                             \
 847             PV_SAVE_ALL_CALLER_REGS                                     \
 848             "call " #func ";"                                           \
 849             PV_RESTORE_ALL_CALLER_REGS                                  \
 850             "ret;"                                                      \
 851             ".popsection")
 852
 853 /* Get a reference to a callee-save function */
 854 #define PV_CALLEE_SAVE(func)                                            \
 855         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 856
 857 /* Promise that "func" already uses the right calling convention */
 858 #define __PV_IS_CALLEE_SAVE(func)                       \
 859         ((struct paravirt_callee_save) { func })
 860
 861 static inline notrace unsigned long arch_local_save_flags(void)
 862 {
 863         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 864 }
 865
 866 static inline notrace void arch_local_irq_restore(unsigned long f)
 867 {
 868         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 869 }
 870
 871 static inline notrace void arch_local_irq_disable(void)
 872 {
 873         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 874 }
 875
 876 static inline notrace void arch_local_irq_enable(void)
 877 {
 878         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 879 }
 880
 881 static inline notrace unsigned long arch_local_irq_save(void)
 882 {
 883         unsigned long f;
 884
 885         f = arch_local_save_flags();
 886         arch_local_irq_disable();
 887         return f;
 888 }
 889
 890
 891 /* Make sure as little as possible of this mess escapes. */
 892 #undef PARAVIRT_CALL
 893 #undef __PVOP_CALL
 894 #undef __PVOP_VCALL
 895 #undef PVOP_VCALL0
 896 #undef PVOP_CALL0
 897 #undef PVOP_VCALL1
 898 #undef PVOP_CALL1
 899 #undef PVOP_VCALL2
 900 #undef PVOP_CALL2
 901 #undef PVOP_VCALL3
 902 #undef PVOP_CALL3
 903 #undef PVOP_VCALL4
 904 #undef PVOP_CALL4
 905
 906 extern void default_banner(void);
 907
 908 #else  /* __ASSEMBLY__ */
 909
 910 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 911 771:;                                           \
 912         ops;                                    \
 913 772:;                                           \
 914         .pushsection .parainstructions,"a";     \
 915          .align algn;                           \
 916          word 771b;                             \
 917          .byte ptype;                           \
 918          .byte 772b-771b;                       \
 919          .short clobbers;                       \
 920         .popsection
 921
 922
 923 #define COND_PUSH(set, mask, reg)                       \
 924         .if ((~(set)) & mask); push %reg; .endif
 925 #define COND_POP(set, mask, reg)                        \
 926         .if ((~(set)) & mask); pop %reg; .endif
 927
 928 #ifdef CONFIG_X86_64
 929
 930 #define PV_SAVE_REGS(set)                       \
 931         COND_PUSH(set, CLBR_RAX, rax);          \
 932         COND_PUSH(set, CLBR_RCX, rcx);          \
 933         COND_PUSH(set, CLBR_RDX, rdx);          \
 934         COND_PUSH(set, CLBR_RSI, rsi);          \
 935         COND_PUSH(set, CLBR_RDI, rdi);          \
 936         COND_PUSH(set, CLBR_R8, r8);            \
 937         COND_PUSH(set, CLBR_R9, r9);            \
 938         COND_PUSH(set, CLBR_R10, r10);          \
 939         COND_PUSH(set, CLBR_R11, r11)
 940 #define PV_RESTORE_REGS(set)                    \
 941         COND_POP(set, CLBR_R11, r11);           \
 942         COND_POP(set, CLBR_R10, r10);           \
 943         COND_POP(set, CLBR_R9, r9);             \
 944         COND_POP(set, CLBR_R8, r8);             \
 945         COND_POP(set, CLBR_RDI, rdi);           \
 946         COND_POP(set, CLBR_RSI, rsi);           \
 947         COND_POP(set, CLBR_RDX, rdx);           \
 948         COND_POP(set, CLBR_RCX, rcx);           \
 949         COND_POP(set, CLBR_RAX, rax)
 950
 951 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 952 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 953 #define PARA_INDIRECT(addr)     *addr(%rip)
 954 #else
 955 #define PV_SAVE_REGS(set)                       \
 956         COND_PUSH(set, CLBR_EAX, eax);          \
 957         COND_PUSH(set, CLBR_EDI, edi);          \
 958         COND_PUSH(set, CLBR_ECX, ecx);          \
 959         COND_PUSH(set, CLBR_EDX, edx)
 960 #define PV_RESTORE_REGS(set)                    \
 961         COND_POP(set, CLBR_EDX, edx);           \
 962         COND_POP(set, CLBR_ECX, ecx);           \
 963         COND_POP(set, CLBR_EDI, edi);           \
 964         COND_POP(set, CLBR_EAX, eax)
 965
 966 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 967 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 968 #define PARA_INDIRECT(addr)     *%cs:addr
 969 #endif
 970
 971 #define INTERRUPT_RETURN                                                \
 972         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 973                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 974
 975 #define DISABLE_INTERRUPTS(clobbers)                                    \
 976         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 977                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 978                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 979                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 980
 981 #define ENABLE_INTERRUPTS(clobbers)                                     \
 982         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 983                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 984                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 985                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 986
 987 #define USERGS_SYSRET32                                                 \
 988         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),       \
 989                   CLBR_NONE,                                            \
 990                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
 991
 992 #ifdef CONFIG_X86_32
 993 #define GET_CR0_INTO_EAX                                \
 994         push %ecx; push %edx;                           \
 995         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 996         pop %edx; pop %ecx
 997
 998 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
 999         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1000                   CLBR_NONE,                                            \
1001                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1002
1003
1004 #else   /* !CONFIG_X86_32 */
1005
1006 /*
1007  * If swapgs is used while the userspace stack is still current,
1008  * there's no way to call a pvop.  The PV replacement *must* be
1009  * inlined, or the swapgs instruction must be trapped and emulated.
1010  */
1011 #define SWAPGS_UNSAFE_STACK                                             \
1012         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
1013                   swapgs)
1014
1015 /*
1016  * Note: swapgs is very special, and in practise is either going to be
1017  * implemented with a single "swapgs" instruction or something very
1018  * special.  Either way, we don't need to save any registers for
1019  * it.
1020  */
1021 #define SWAPGS                                                          \
1022         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
1023                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
1024                  )
1025
1026 #define GET_CR2_INTO_RAX                                \
1027         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
1028
1029 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
1030         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
1031                   CLBR_NONE,                                            \
1032                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
1033
1034 #define USERGS_SYSRET64                                                 \
1035         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
1036                   CLBR_NONE,                                            \
1037                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
1038
1039 #define ENABLE_INTERRUPTS_SYSEXIT32                                     \
1040         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1041                   CLBR_NONE,                                            \
1042                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1043 #endif  /* CONFIG_X86_32 */
1044
1045 #endif /* __ASSEMBLY__ */
1046 #else  /* CONFIG_PARAVIRT */
1047 # define default_banner x86_init_noop
1048 #endif /* !CONFIG_PARAVIRT */
1049 #endif /* _ASM_X86_PARAVIRT_H */