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         return 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                                     struct mm_struct *mm,
 316                                     unsigned long start,
 317                                     unsigned long end)
 318 {
 319         PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end);
 320 }
 321
 322 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 323 {
 324         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 325 }
 326
 327 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 328 {
 329         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 330 }
 331
 332 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 333 {
 334         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 335 }
 336 static inline void paravirt_release_pte(unsigned long pfn)
 337 {
 338         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 339 }
 340
 341 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 342 {
 343         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 344 }
 345
 346 static inline void paravirt_release_pmd(unsigned long pfn)
 347 {
 348         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 349 }
 350
 351 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 352 {
 353         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 354 }
 355 static inline void paravirt_release_pud(unsigned long pfn)
 356 {
 357         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 358 }
 359
 360 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 361                               pte_t *ptep)
 362 {
 363         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 364 }
 365
 366 static inline pte_t __pte(pteval_t val)
 367 {
 368         pteval_t ret;
 369
 370         if (sizeof(pteval_t) > sizeof(long))
 371                 ret = PVOP_CALLEE2(pteval_t,
 372                                    pv_mmu_ops.make_pte,
 373                                    val, (u64)val >> 32);
 374         else
 375                 ret = PVOP_CALLEE1(pteval_t,
 376                                    pv_mmu_ops.make_pte,
 377                                    val);
 378
 379         return (pte_t) { .pte = ret };
 380 }
 381
 382 static inline pteval_t pte_val(pte_t pte)
 383 {
 384         pteval_t ret;
 385
 386         if (sizeof(pteval_t) > sizeof(long))
 387                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 388                                    pte.pte, (u64)pte.pte >> 32);
 389         else
 390                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 391                                    pte.pte);
 392
 393         return ret;
 394 }
 395
 396 static inline pgd_t __pgd(pgdval_t val)
 397 {
 398         pgdval_t ret;
 399
 400         if (sizeof(pgdval_t) > sizeof(long))
 401                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 402                                    val, (u64)val >> 32);
 403         else
 404                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 405                                    val);
 406
 407         return (pgd_t) { ret };
 408 }
 409
 410 static inline pgdval_t pgd_val(pgd_t pgd)
 411 {
 412         pgdval_t ret;
 413
 414         if (sizeof(pgdval_t) > sizeof(long))
 415                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 416                                     pgd.pgd, (u64)pgd.pgd >> 32);
 417         else
 418                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 419                                     pgd.pgd);
 420
 421         return ret;
 422 }
 423
 424 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 425 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 426                                            pte_t *ptep)
 427 {
 428         pteval_t ret;
 429
 430         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 431                          mm, addr, ptep);
 432
 433         return (pte_t) { .pte = ret };
 434 }
 435
 436 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 437                                            pte_t *ptep, pte_t pte)
 438 {
 439         if (sizeof(pteval_t) > sizeof(long))
 440                 /* 5 arg words */
 441                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 442         else
 443                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 444                             mm, addr, ptep, pte.pte);
 445 }
 446
 447 static inline void set_pte(pte_t *ptep, pte_t pte)
 448 {
 449         if (sizeof(pteval_t) > sizeof(long))
 450                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 451                             pte.pte, (u64)pte.pte >> 32);
 452         else
 453                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 454                             pte.pte);
 455 }
 456
 457 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 458                               pte_t *ptep, pte_t pte)
 459 {
 460         if (sizeof(pteval_t) > sizeof(long))
 461                 /* 5 arg words */
 462                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 463         else
 464                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 465 }
 466
 467 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 468                               pmd_t *pmdp, pmd_t pmd)
 469 {
 470         if (sizeof(pmdval_t) > sizeof(long))
 471                 /* 5 arg words */
 472                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
 473         else
 474                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
 475                             native_pmd_val(pmd));
 476 }
 477
 478 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 479 {
 480         pmdval_t val = native_pmd_val(pmd);
 481
 482         if (sizeof(pmdval_t) > sizeof(long))
 483                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 484         else
 485                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 486 }
 487
 488 #if CONFIG_PGTABLE_LEVELS >= 3
 489 static inline pmd_t __pmd(pmdval_t val)
 490 {
 491         pmdval_t ret;
 492
 493         if (sizeof(pmdval_t) > sizeof(long))
 494                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 495                                    val, (u64)val >> 32);
 496         else
 497                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 498                                    val);
 499
 500         return (pmd_t) { ret };
 501 }
 502
 503 static inline pmdval_t pmd_val(pmd_t pmd)
 504 {
 505         pmdval_t ret;
 506
 507         if (sizeof(pmdval_t) > sizeof(long))
 508                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 509                                     pmd.pmd, (u64)pmd.pmd >> 32);
 510         else
 511                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 512                                     pmd.pmd);
 513
 514         return ret;
 515 }
 516
 517 static inline void set_pud(pud_t *pudp, pud_t pud)
 518 {
 519         pudval_t val = native_pud_val(pud);
 520
 521         if (sizeof(pudval_t) > sizeof(long))
 522                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 523                             val, (u64)val >> 32);
 524         else
 525                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 526                             val);
 527 }
 528 #if CONFIG_PGTABLE_LEVELS == 4
 529 static inline pud_t __pud(pudval_t val)
 530 {
 531         pudval_t ret;
 532
 533         if (sizeof(pudval_t) > sizeof(long))
 534                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 535                                    val, (u64)val >> 32);
 536         else
 537                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 538                                    val);
 539
 540         return (pud_t) { ret };
 541 }
 542
 543 static inline pudval_t pud_val(pud_t pud)
 544 {
 545         pudval_t ret;
 546
 547         if (sizeof(pudval_t) > sizeof(long))
 548                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 549                                     pud.pud, (u64)pud.pud >> 32);
 550         else
 551                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 552                                     pud.pud);
 553
 554         return ret;
 555 }
 556
 557 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 558 {
 559         pgdval_t val = native_pgd_val(pgd);
 560
 561         if (sizeof(pgdval_t) > sizeof(long))
 562                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
 563                             val, (u64)val >> 32);
 564         else
 565                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
 566                             val);
 567 }
 568
 569 static inline void pgd_clear(pgd_t *pgdp)
 570 {
 571         set_pgd(pgdp, __pgd(0));
 572 }
 573
 574 static inline void pud_clear(pud_t *pudp)
 575 {
 576         set_pud(pudp, __pud(0));
 577 }
 578
 579 #endif  /* CONFIG_PGTABLE_LEVELS == 4 */
 580
 581 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 582
 583 #ifdef CONFIG_X86_PAE
 584 /* Special-case pte-setting operations for PAE, which can't update a
 585    64-bit pte atomically */
 586 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 587 {
 588         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 589                     pte.pte, pte.pte >> 32);
 590 }
 591
 592 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 593                              pte_t *ptep)
 594 {
 595         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 596 }
 597
 598 static inline void pmd_clear(pmd_t *pmdp)
 599 {
 600         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 601 }
 602 #else  /* !CONFIG_X86_PAE */
 603 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 604 {
 605         set_pte(ptep, pte);
 606 }
 607
 608 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 609                              pte_t *ptep)
 610 {
 611         set_pte_at(mm, addr, ptep, __pte(0));
 612 }
 613
 614 static inline void pmd_clear(pmd_t *pmdp)
 615 {
 616         set_pmd(pmdp, __pmd(0));
 617 }
 618 #endif  /* CONFIG_X86_PAE */
 619
 620 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 621 static inline void arch_start_context_switch(struct task_struct *prev)
 622 {
 623         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 624 }
 625
 626 static inline void arch_end_context_switch(struct task_struct *next)
 627 {
 628         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 629 }
 630
 631 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 632 static inline void arch_enter_lazy_mmu_mode(void)
 633 {
 634         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 635 }
 636
 637 static inline void arch_leave_lazy_mmu_mode(void)
 638 {
 639         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 640 }
 641
 642 static inline void arch_flush_lazy_mmu_mode(void)
 643 {
 644         PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
 645 }
 646
 647 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 648                                 phys_addr_t phys, pgprot_t flags)
 649 {
 650         pv_mmu_ops.set_fixmap(idx, phys, flags);
 651 }
 652
 653 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 654
 655 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
 656                                                         u32 val)
 657 {
 658         PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
 659 }
 660
 661 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
 662 {
 663         PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
 664 }
 665
 666 static __always_inline void pv_wait(u8 *ptr, u8 val)
 667 {
 668         PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
 669 }
 670
 671 static __always_inline void pv_kick(int cpu)
 672 {
 673         PVOP_VCALL1(pv_lock_ops.kick, cpu);
 674 }
 675
 676 static __always_inline bool pv_vcpu_is_preempted(int cpu)
 677 {
 678         return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
 679 }
 680
 681 #endif /* SMP && PARAVIRT_SPINLOCKS */
 682
 683 #ifdef CONFIG_X86_32
 684 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 685 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 686
 687 /* save and restore all caller-save registers, except return value */
 688 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 689 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 690
 691 #define PV_FLAGS_ARG "0"
 692 #define PV_EXTRA_CLOBBERS
 693 #define PV_VEXTRA_CLOBBERS
 694 #else
 695 /* save and restore all caller-save registers, except return value */
 696 #define PV_SAVE_ALL_CALLER_REGS                                         \
 697         "push %rcx;"                                                    \
 698         "push %rdx;"                                                    \
 699         "push %rsi;"                                                    \
 700         "push %rdi;"                                                    \
 701         "push %r8;"                                                     \
 702         "push %r9;"                                                     \
 703         "push %r10;"                                                    \
 704         "push %r11;"
 705 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 706         "pop %r11;"                                                     \
 707         "pop %r10;"                                                     \
 708         "pop %r9;"                                                      \
 709         "pop %r8;"                                                      \
 710         "pop %rdi;"                                                     \
 711         "pop %rsi;"                                                     \
 712         "pop %rdx;"                                                     \
 713         "pop %rcx;"
 714
 715 /* We save some registers, but all of them, that's too much. We clobber all
 716  * caller saved registers but the argument parameter */
 717 #define PV_SAVE_REGS "pushq %%rdi;"
 718 #define PV_RESTORE_REGS "popq %%rdi;"
 719 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 720 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 721 #define PV_FLAGS_ARG "D"
 722 #endif
 723
 724 /*
 725  * Generate a thunk around a function which saves all caller-save
 726  * registers except for the return value.  This allows C functions to
 727  * be called from assembler code where fewer than normal registers are
 728  * available.  It may also help code generation around calls from C
 729  * code if the common case doesn't use many registers.
 730  *
 731  * When a callee is wrapped in a thunk, the caller can assume that all
 732  * arg regs and all scratch registers are preserved across the
 733  * call. The return value in rax/eax will not be saved, even for void
 734  * functions.
 735  */
 736 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
 737 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 738         extern typeof(func) __raw_callee_save_##func;                   \
 739                                                                         \
 740         asm(".pushsection .text;"                                       \
 741             ".globl " PV_THUNK_NAME(func) ";"                           \
 742             ".type " PV_THUNK_NAME(func) ", @function;"                 \
 743             PV_THUNK_NAME(func) ":"                                     \
 744             FRAME_BEGIN                                                 \
 745             PV_SAVE_ALL_CALLER_REGS                                     \
 746             "call " #func ";"                                           \
 747             PV_RESTORE_ALL_CALLER_REGS                                  \
 748             FRAME_END                                                   \
 749             "ret;"                                                      \
 750             ".popsection")
 751
 752 /* Get a reference to a callee-save function */
 753 #define PV_CALLEE_SAVE(func)                                            \
 754         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 755
 756 /* Promise that "func" already uses the right calling convention */
 757 #define __PV_IS_CALLEE_SAVE(func)                       \
 758         ((struct paravirt_callee_save) { func })
 759
 760 static inline notrace unsigned long arch_local_save_flags(void)
 761 {
 762         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 763 }
 764
 765 static inline notrace void arch_local_irq_restore(unsigned long f)
 766 {
 767         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 768 }
 769
 770 static inline notrace void arch_local_irq_disable(void)
 771 {
 772         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 773 }
 774
 775 static inline notrace void arch_local_irq_enable(void)
 776 {
 777         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 778 }
 779
 780 static inline notrace unsigned long arch_local_irq_save(void)
 781 {
 782         unsigned long f;
 783
 784         f = arch_local_save_flags();
 785         arch_local_irq_disable();
 786         return f;
 787 }
 788
 789
 790 /* Make sure as little as possible of this mess escapes. */
 791 #undef PARAVIRT_CALL
 792 #undef __PVOP_CALL
 793 #undef __PVOP_VCALL
 794 #undef PVOP_VCALL0
 795 #undef PVOP_CALL0
 796 #undef PVOP_VCALL1
 797 #undef PVOP_CALL1
 798 #undef PVOP_VCALL2
 799 #undef PVOP_CALL2
 800 #undef PVOP_VCALL3
 801 #undef PVOP_CALL3
 802 #undef PVOP_VCALL4
 803 #undef PVOP_CALL4
 804
 805 extern void default_banner(void);
 806
 807 #else  /* __ASSEMBLY__ */
 808
 809 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 810 771:;                                           \
 811         ops;                                    \
 812 772:;                                           \
 813         .pushsection .parainstructions,"a";     \
 814          .align algn;                           \
 815          word 771b;                             \
 816          .byte ptype;                           \
 817          .byte 772b-771b;                       \
 818          .short clobbers;                       \
 819         .popsection
 820
 821
 822 #define COND_PUSH(set, mask, reg)                       \
 823         .if ((~(set)) & mask); push %reg; .endif
 824 #define COND_POP(set, mask, reg)                        \
 825         .if ((~(set)) & mask); pop %reg; .endif
 826
 827 #ifdef CONFIG_X86_64
 828
 829 #define PV_SAVE_REGS(set)                       \
 830         COND_PUSH(set, CLBR_RAX, rax);          \
 831         COND_PUSH(set, CLBR_RCX, rcx);          \
 832         COND_PUSH(set, CLBR_RDX, rdx);          \
 833         COND_PUSH(set, CLBR_RSI, rsi);          \
 834         COND_PUSH(set, CLBR_RDI, rdi);          \
 835         COND_PUSH(set, CLBR_R8, r8);            \
 836         COND_PUSH(set, CLBR_R9, r9);            \
 837         COND_PUSH(set, CLBR_R10, r10);          \
 838         COND_PUSH(set, CLBR_R11, r11)
 839 #define PV_RESTORE_REGS(set)                    \
 840         COND_POP(set, CLBR_R11, r11);           \
 841         COND_POP(set, CLBR_R10, r10);           \
 842         COND_POP(set, CLBR_R9, r9);             \
 843         COND_POP(set, CLBR_R8, r8);             \
 844         COND_POP(set, CLBR_RDI, rdi);           \
 845         COND_POP(set, CLBR_RSI, rsi);           \
 846         COND_POP(set, CLBR_RDX, rdx);           \
 847         COND_POP(set, CLBR_RCX, rcx);           \
 848         COND_POP(set, CLBR_RAX, rax)
 849
 850 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 851 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 852 #define PARA_INDIRECT(addr)     *addr(%rip)
 853 #else
 854 #define PV_SAVE_REGS(set)                       \
 855         COND_PUSH(set, CLBR_EAX, eax);          \
 856         COND_PUSH(set, CLBR_EDI, edi);          \
 857         COND_PUSH(set, CLBR_ECX, ecx);          \
 858         COND_PUSH(set, CLBR_EDX, edx)
 859 #define PV_RESTORE_REGS(set)                    \
 860         COND_POP(set, CLBR_EDX, edx);           \
 861         COND_POP(set, CLBR_ECX, ecx);           \
 862         COND_POP(set, CLBR_EDI, edi);           \
 863         COND_POP(set, CLBR_EAX, eax)
 864
 865 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 866 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 867 #define PARA_INDIRECT(addr)     *%cs:addr
 868 #endif
 869
 870 #define INTERRUPT_RETURN                                                \
 871         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 872                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 873
 874 #define DISABLE_INTERRUPTS(clobbers)                                    \
 875         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 876                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 877                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 878                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 879
 880 #define ENABLE_INTERRUPTS(clobbers)                                     \
 881         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 882                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 883                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 884                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 885
 886 #ifdef CONFIG_X86_32
 887 #define GET_CR0_INTO_EAX                                \
 888         push %ecx; push %edx;                           \
 889         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 890         pop %edx; pop %ecx
 891 #else   /* !CONFIG_X86_32 */
 892
 893 /*
 894  * If swapgs is used while the userspace stack is still current,
 895  * there's no way to call a pvop.  The PV replacement *must* be
 896  * inlined, or the swapgs instruction must be trapped and emulated.
 897  */
 898 #define SWAPGS_UNSAFE_STACK                                             \
 899         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 900                   swapgs)
 901
 902 /*
 903  * Note: swapgs is very special, and in practise is either going to be
 904  * implemented with a single "swapgs" instruction or something very
 905  * special.  Either way, we don't need to save any registers for
 906  * it.
 907  */
 908 #define SWAPGS                                                          \
 909         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 910                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
 911                  )
 912
 913 #define GET_CR2_INTO_RAX                                \
 914         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
 915
 916 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
 917         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
 918                   CLBR_NONE,                                            \
 919                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
 920
 921 #define USERGS_SYSRET64                                                 \
 922         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
 923                   CLBR_NONE,                                            \
 924                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
 925 #endif  /* CONFIG_X86_32 */
 926
 927 #endif /* __ASSEMBLY__ */
 928 #else  /* CONFIG_PARAVIRT */
 929 # define default_banner x86_init_noop
 930 #ifndef __ASSEMBLY__
 931 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 932                                           struct mm_struct *mm)
 933 {
 934 }
 935
 936 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 937 {
 938 }
 939 #endif /* __ASSEMBLY__ */
 940 #endif /* !CONFIG_PARAVIRT */
 941 #endif /* _ASM_X86_PARAVIRT_H */