arch/x86/include/asm/paravirt.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PARAVIRT_H
   3 #define _ASM_X86_PARAVIRT_H
   4 /* Various instructions on x86 need to be replaced for
   5  * para-virtualization: those hooks are defined here. */
   6
   7 #ifdef CONFIG_PARAVIRT
   8 #include <asm/pgtable_types.h>
   9 #include <asm/asm.h>
  10 #include <asm/nospec-branch.h>
  11
  12 #include <asm/paravirt_types.h>
  13
  14 #ifndef __ASSEMBLY__
  15 #include <linux/bug.h>
  16 #include <linux/types.h>
  17 #include <linux/cpumask.h>
  18 #include <asm/frame.h>
  19
  20 static inline void load_sp0(unsigned long sp0)
  21 {
  22         PVOP_VCALL1(pv_cpu_ops.load_sp0, sp0);
  23 }
  24
  25 /* The paravirtualized CPUID instruction. */
  26 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
  27                            unsigned int *ecx, unsigned int *edx)
  28 {
  29         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
  30 }
  31
  32 /*
  33  * These special macros can be used to get or set a debugging register
  34  */
  35 static inline unsigned long paravirt_get_debugreg(int reg)
  36 {
  37         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
  38 }
  39 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
  40 static inline void set_debugreg(unsigned long val, int reg)
  41 {
  42         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
  43 }
  44
  45 static inline unsigned long read_cr0(void)
  46 {
  47         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
  48 }
  49
  50 static inline void write_cr0(unsigned long x)
  51 {
  52         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
  53 }
  54
  55 static inline unsigned long read_cr2(void)
  56 {
  57         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
  58 }
  59
  60 static inline void write_cr2(unsigned long x)
  61 {
  62         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
  63 }
  64
  65 static inline unsigned long __read_cr3(void)
  66 {
  67         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
  68 }
  69
  70 static inline void write_cr3(unsigned long x)
  71 {
  72         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
  73 }
  74
  75 static inline void __write_cr4(unsigned long x)
  76 {
  77         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
  78 }
  79
  80 #ifdef CONFIG_X86_64
  81 static inline unsigned long read_cr8(void)
  82 {
  83         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
  84 }
  85
  86 static inline void write_cr8(unsigned long x)
  87 {
  88         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
  89 }
  90 #endif
  91
  92 static inline void arch_safe_halt(void)
  93 {
  94         PVOP_VCALL0(pv_irq_ops.safe_halt);
  95 }
  96
  97 static inline void halt(void)
  98 {
  99         PVOP_VCALL0(pv_irq_ops.halt);
 100 }
 101
 102 static inline void wbinvd(void)
 103 {
 104         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 105 }
 106
 107 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 108
 109 static inline u64 paravirt_read_msr(unsigned msr)
 110 {
 111         return PVOP_CALL1(u64, pv_cpu_ops.read_msr, msr);
 112 }
 113
 114 static inline void paravirt_write_msr(unsigned msr,
 115                                       unsigned low, unsigned high)
 116 {
 117         PVOP_VCALL3(pv_cpu_ops.write_msr, msr, low, high);
 118 }
 119
 120 static inline u64 paravirt_read_msr_safe(unsigned msr, int *err)
 121 {
 122         return PVOP_CALL2(u64, pv_cpu_ops.read_msr_safe, msr, err);
 123 }
 124
 125 static inline int paravirt_write_msr_safe(unsigned msr,
 126                                           unsigned low, unsigned high)
 127 {
 128         return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high);
 129 }
 130
 131 #define rdmsr(msr, val1, val2)                  \
 132 do {                                            \
 133         u64 _l = paravirt_read_msr(msr);        \
 134         val1 = (u32)_l;                         \
 135         val2 = _l >> 32;                        \
 136 } while (0)
 137
 138 #define wrmsr(msr, val1, val2)                  \
 139 do {                                            \
 140         paravirt_write_msr(msr, val1, val2);    \
 141 } while (0)
 142
 143 #define rdmsrl(msr, val)                        \
 144 do {                                            \
 145         val = paravirt_read_msr(msr);           \
 146 } while (0)
 147
 148 static inline void wrmsrl(unsigned msr, u64 val)
 149 {
 150         wrmsr(msr, (u32)val, (u32)(val>>32));
 151 }
 152
 153 #define wrmsr_safe(msr, a, b)   paravirt_write_msr_safe(msr, a, b)
 154
 155 /* rdmsr with exception handling */
 156 #define rdmsr_safe(msr, a, b)                           \
 157 ({                                                      \
 158         int _err;                                       \
 159         u64 _l = paravirt_read_msr_safe(msr, &_err);    \
 160         (*a) = (u32)_l;                                 \
 161         (*b) = _l >> 32;                                \
 162         _err;                                           \
 163 })
 164
 165 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 166 {
 167         int err;
 168
 169         *p = paravirt_read_msr_safe(msr, &err);
 170         return err;
 171 }
 172
 173 static inline unsigned long long paravirt_sched_clock(void)
 174 {
 175         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 176 }
 177
 178 struct static_key;
 179 extern struct static_key paravirt_steal_enabled;
 180 extern struct static_key paravirt_steal_rq_enabled;
 181
 182 static inline u64 paravirt_steal_clock(int cpu)
 183 {
 184         return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
 185 }
 186
 187 static inline unsigned long long paravirt_read_pmc(int counter)
 188 {
 189         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 190 }
 191
 192 #define rdpmc(counter, low, high)               \
 193 do {                                            \
 194         u64 _l = paravirt_read_pmc(counter);    \
 195         low = (u32)_l;                          \
 196         high = _l >> 32;                        \
 197 } while (0)
 198
 199 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
 200
 201 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 202 {
 203         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 204 }
 205
 206 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 207 {
 208         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 209 }
 210
 211 static inline void load_TR_desc(void)
 212 {
 213         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 214 }
 215 static inline void load_gdt(const struct desc_ptr *dtr)
 216 {
 217         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 218 }
 219 static inline void load_idt(const struct desc_ptr *dtr)
 220 {
 221         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 222 }
 223 static inline void set_ldt(const void *addr, unsigned entries)
 224 {
 225         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 226 }
 227 static inline unsigned long paravirt_store_tr(void)
 228 {
 229         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 230 }
 231 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 232 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 233 {
 234         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 235 }
 236
 237 #ifdef CONFIG_X86_64
 238 static inline void load_gs_index(unsigned int gs)
 239 {
 240         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 241 }
 242 #endif
 243
 244 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 245                                    const void *desc)
 246 {
 247         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 248 }
 249
 250 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 251                                    void *desc, int type)
 252 {
 253         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 254 }
 255
 256 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 257 {
 258         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 259 }
 260 static inline void set_iopl_mask(unsigned mask)
 261 {
 262         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 263 }
 264
 265 /* The paravirtualized I/O functions */
 266 static inline void slow_down_io(void)
 267 {
 268         pv_cpu_ops.io_delay();
 269 #ifdef REALLY_SLOW_IO
 270         pv_cpu_ops.io_delay();
 271         pv_cpu_ops.io_delay();
 272         pv_cpu_ops.io_delay();
 273 #endif
 274 }
 275
 276 static inline void paravirt_activate_mm(struct mm_struct *prev,
 277                                         struct mm_struct *next)
 278 {
 279         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 280 }
 281
 282 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 283                                           struct mm_struct *mm)
 284 {
 285         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 286 }
 287
 288 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 289 {
 290         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 291 }
 292
 293 static inline void __flush_tlb(void)
 294 {
 295         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 296 }
 297 static inline void __flush_tlb_global(void)
 298 {
 299         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 300 }
 301 static inline void __flush_tlb_one_user(unsigned long addr)
 302 {
 303         PVOP_VCALL1(pv_mmu_ops.flush_tlb_one_user, addr);
 304 }
 305
 306 static inline void flush_tlb_others(const struct cpumask *cpumask,
 307                                     const struct flush_tlb_info *info)
 308 {
 309         PVOP_VCALL2(pv_mmu_ops.flush_tlb_others, cpumask, info);
 310 }
 311
 312 static inline void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)
 313 {
 314         PVOP_VCALL2(pv_mmu_ops.tlb_remove_table, tlb, table);
 315 }
 316
 317 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 318 {
 319         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 320 }
 321
 322 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 323 {
 324         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 325 }
 326
 327 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 328 {
 329         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 330 }
 331 static inline void paravirt_release_pte(unsigned long pfn)
 332 {
 333         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 334 }
 335
 336 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 337 {
 338         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 339 }
 340
 341 static inline void paravirt_release_pmd(unsigned long pfn)
 342 {
 343         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 344 }
 345
 346 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 347 {
 348         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 349 }
 350 static inline void paravirt_release_pud(unsigned long pfn)
 351 {
 352         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 353 }
 354
 355 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)
 356 {
 357         PVOP_VCALL2(pv_mmu_ops.alloc_p4d, mm, pfn);
 358 }
 359
 360 static inline void paravirt_release_p4d(unsigned long pfn)
 361 {
 362         PVOP_VCALL1(pv_mmu_ops.release_p4d, pfn);
 363 }
 364
 365 static inline pte_t __pte(pteval_t val)
 366 {
 367         pteval_t ret;
 368
 369         if (sizeof(pteval_t) > sizeof(long))
 370                 ret = PVOP_CALLEE2(pteval_t,
 371                                    pv_mmu_ops.make_pte,
 372                                    val, (u64)val >> 32);
 373         else
 374                 ret = PVOP_CALLEE1(pteval_t,
 375                                    pv_mmu_ops.make_pte,
 376                                    val);
 377
 378         return (pte_t) { .pte = ret };
 379 }
 380
 381 static inline pteval_t pte_val(pte_t pte)
 382 {
 383         pteval_t ret;
 384
 385         if (sizeof(pteval_t) > sizeof(long))
 386                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 387                                    pte.pte, (u64)pte.pte >> 32);
 388         else
 389                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 390                                    pte.pte);
 391
 392         return ret;
 393 }
 394
 395 static inline pgd_t __pgd(pgdval_t val)
 396 {
 397         pgdval_t ret;
 398
 399         if (sizeof(pgdval_t) > sizeof(long))
 400                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 401                                    val, (u64)val >> 32);
 402         else
 403                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 404                                    val);
 405
 406         return (pgd_t) { ret };
 407 }
 408
 409 static inline pgdval_t pgd_val(pgd_t pgd)
 410 {
 411         pgdval_t ret;
 412
 413         if (sizeof(pgdval_t) > sizeof(long))
 414                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 415                                     pgd.pgd, (u64)pgd.pgd >> 32);
 416         else
 417                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 418                                     pgd.pgd);
 419
 420         return ret;
 421 }
 422
 423 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 424 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 425                                            pte_t *ptep)
 426 {
 427         pteval_t ret;
 428
 429         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 430                          mm, addr, ptep);
 431
 432         return (pte_t) { .pte = ret };
 433 }
 434
 435 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 436                                            pte_t *ptep, pte_t pte)
 437 {
 438         if (sizeof(pteval_t) > sizeof(long))
 439                 /* 5 arg words */
 440                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 441         else
 442                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 443                             mm, addr, ptep, pte.pte);
 444 }
 445
 446 static inline void set_pte(pte_t *ptep, pte_t pte)
 447 {
 448         if (sizeof(pteval_t) > sizeof(long))
 449                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 450                             pte.pte, (u64)pte.pte >> 32);
 451         else
 452                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 453                             pte.pte);
 454 }
 455
 456 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 457                               pte_t *ptep, pte_t pte)
 458 {
 459         if (sizeof(pteval_t) > sizeof(long))
 460                 /* 5 arg words */
 461                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 462         else
 463                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 464 }
 465
 466 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 467 {
 468         pmdval_t val = native_pmd_val(pmd);
 469
 470         if (sizeof(pmdval_t) > sizeof(long))
 471                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 472         else
 473                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 474 }
 475
 476 #if CONFIG_PGTABLE_LEVELS >= 3
 477 static inline pmd_t __pmd(pmdval_t val)
 478 {
 479         pmdval_t ret;
 480
 481         if (sizeof(pmdval_t) > sizeof(long))
 482                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 483                                    val, (u64)val >> 32);
 484         else
 485                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 486                                    val);
 487
 488         return (pmd_t) { ret };
 489 }
 490
 491 static inline pmdval_t pmd_val(pmd_t pmd)
 492 {
 493         pmdval_t ret;
 494
 495         if (sizeof(pmdval_t) > sizeof(long))
 496                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 497                                     pmd.pmd, (u64)pmd.pmd >> 32);
 498         else
 499                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 500                                     pmd.pmd);
 501
 502         return ret;
 503 }
 504
 505 static inline void set_pud(pud_t *pudp, pud_t pud)
 506 {
 507         pudval_t val = native_pud_val(pud);
 508
 509         if (sizeof(pudval_t) > sizeof(long))
 510                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 511                             val, (u64)val >> 32);
 512         else
 513                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 514                             val);
 515 }
 516 #if CONFIG_PGTABLE_LEVELS >= 4
 517 static inline pud_t __pud(pudval_t val)
 518 {
 519         pudval_t ret;
 520
 521         if (sizeof(pudval_t) > sizeof(long))
 522                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 523                                    val, (u64)val >> 32);
 524         else
 525                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 526                                    val);
 527
 528         return (pud_t) { ret };
 529 }
 530
 531 static inline pudval_t pud_val(pud_t pud)
 532 {
 533         pudval_t ret;
 534
 535         if (sizeof(pudval_t) > sizeof(long))
 536                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 537                                     pud.pud, (u64)pud.pud >> 32);
 538         else
 539                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 540                                     pud.pud);
 541
 542         return ret;
 543 }
 544
 545 static inline void pud_clear(pud_t *pudp)
 546 {
 547         set_pud(pudp, __pud(0));
 548 }
 549
 550 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
 551 {
 552         p4dval_t val = native_p4d_val(p4d);
 553
 554         if (sizeof(p4dval_t) > sizeof(long))
 555                 PVOP_VCALL3(pv_mmu_ops.set_p4d, p4dp,
 556                             val, (u64)val >> 32);
 557         else
 558                 PVOP_VCALL2(pv_mmu_ops.set_p4d, p4dp,
 559                             val);
 560 }
 561
 562 #if CONFIG_PGTABLE_LEVELS >= 5
 563
 564 static inline p4d_t __p4d(p4dval_t val)
 565 {
 566         p4dval_t ret = PVOP_CALLEE1(p4dval_t, pv_mmu_ops.make_p4d, val);
 567
 568         return (p4d_t) { ret };
 569 }
 570
 571 static inline p4dval_t p4d_val(p4d_t p4d)
 572 {
 573         return PVOP_CALLEE1(p4dval_t, pv_mmu_ops.p4d_val, p4d.p4d);
 574 }
 575
 576 static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
 577 {
 578         PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, native_pgd_val(pgd));
 579 }
 580
 581 #define set_pgd(pgdp, pgdval) do {                                      \
 582         if (pgtable_l5_enabled())                                               \
 583                 __set_pgd(pgdp, pgdval);                                \
 584         else                                                            \
 585                 set_p4d((p4d_t *)(pgdp), (p4d_t) { (pgdval).pgd });     \
 586 } while (0)
 587
 588 #define pgd_clear(pgdp) do {                                            \
 589         if (pgtable_l5_enabled())                                               \
 590                 set_pgd(pgdp, __pgd(0));                                \
 591 } while (0)
 592
 593 #endif  /* CONFIG_PGTABLE_LEVELS == 5 */
 594
 595 static inline void p4d_clear(p4d_t *p4dp)
 596 {
 597         set_p4d(p4dp, __p4d(0));
 598 }
 599
 600 #endif  /* CONFIG_PGTABLE_LEVELS == 4 */
 601
 602 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 603
 604 #ifdef CONFIG_X86_PAE
 605 /* Special-case pte-setting operations for PAE, which can't update a
 606    64-bit pte atomically */
 607 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 608 {
 609         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 610                     pte.pte, pte.pte >> 32);
 611 }
 612
 613 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 614                              pte_t *ptep)
 615 {
 616         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 617 }
 618
 619 static inline void pmd_clear(pmd_t *pmdp)
 620 {
 621         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 622 }
 623 #else  /* !CONFIG_X86_PAE */
 624 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 625 {
 626         set_pte(ptep, pte);
 627 }
 628
 629 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 630                              pte_t *ptep)
 631 {
 632         set_pte_at(mm, addr, ptep, __pte(0));
 633 }
 634
 635 static inline void pmd_clear(pmd_t *pmdp)
 636 {
 637         set_pmd(pmdp, __pmd(0));
 638 }
 639 #endif  /* CONFIG_X86_PAE */
 640
 641 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 642 static inline void arch_start_context_switch(struct task_struct *prev)
 643 {
 644         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 645 }
 646
 647 static inline void arch_end_context_switch(struct task_struct *next)
 648 {
 649         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 650 }
 651
 652 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 653 static inline void arch_enter_lazy_mmu_mode(void)
 654 {
 655         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 656 }
 657
 658 static inline void arch_leave_lazy_mmu_mode(void)
 659 {
 660         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 661 }
 662
 663 static inline void arch_flush_lazy_mmu_mode(void)
 664 {
 665         PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
 666 }
 667
 668 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 669                                 phys_addr_t phys, pgprot_t flags)
 670 {
 671         pv_mmu_ops.set_fixmap(idx, phys, flags);
 672 }
 673
 674 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 675
 676 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
 677                                                         u32 val)
 678 {
 679         PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
 680 }
 681
 682 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
 683 {
 684         PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
 685 }
 686
 687 static __always_inline void pv_wait(u8 *ptr, u8 val)
 688 {
 689         PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
 690 }
 691
 692 static __always_inline void pv_kick(int cpu)
 693 {
 694         PVOP_VCALL1(pv_lock_ops.kick, cpu);
 695 }
 696
 697 static __always_inline bool pv_vcpu_is_preempted(long cpu)
 698 {
 699         return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
 700 }
 701
 702 #endif /* SMP && PARAVIRT_SPINLOCKS */
 703
 704 #ifdef CONFIG_X86_32
 705 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 706 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 707
 708 /* save and restore all caller-save registers, except return value */
 709 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 710 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 711
 712 #define PV_FLAGS_ARG "0"
 713 #define PV_EXTRA_CLOBBERS
 714 #define PV_VEXTRA_CLOBBERS
 715 #else
 716 /* save and restore all caller-save registers, except return value */
 717 #define PV_SAVE_ALL_CALLER_REGS                                         \
 718         "push %rcx;"                                                    \
 719         "push %rdx;"                                                    \
 720         "push %rsi;"                                                    \
 721         "push %rdi;"                                                    \
 722         "push %r8;"                                                     \
 723         "push %r9;"                                                     \
 724         "push %r10;"                                                    \
 725         "push %r11;"
 726 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 727         "pop %r11;"                                                     \
 728         "pop %r10;"                                                     \
 729         "pop %r9;"                                                      \
 730         "pop %r8;"                                                      \
 731         "pop %rdi;"                                                     \
 732         "pop %rsi;"                                                     \
 733         "pop %rdx;"                                                     \
 734         "pop %rcx;"
 735
 736 /* We save some registers, but all of them, that's too much. We clobber all
 737  * caller saved registers but the argument parameter */
 738 #define PV_SAVE_REGS "pushq %%rdi;"
 739 #define PV_RESTORE_REGS "popq %%rdi;"
 740 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 741 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 742 #define PV_FLAGS_ARG "D"
 743 #endif
 744
 745 /*
 746  * Generate a thunk around a function which saves all caller-save
 747  * registers except for the return value.  This allows C functions to
 748  * be called from assembler code where fewer than normal registers are
 749  * available.  It may also help code generation around calls from C
 750  * code if the common case doesn't use many registers.
 751  *
 752  * When a callee is wrapped in a thunk, the caller can assume that all
 753  * arg regs and all scratch registers are preserved across the
 754  * call. The return value in rax/eax will not be saved, even for void
 755  * functions.
 756  */
 757 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
 758 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 759         extern typeof(func) __raw_callee_save_##func;                   \
 760                                                                         \
 761         asm(".pushsection .text;"                                       \
 762             ".globl " PV_THUNK_NAME(func) ";"                           \
 763             ".type " PV_THUNK_NAME(func) ", @function;"                 \
 764             PV_THUNK_NAME(func) ":"                                     \
 765             FRAME_BEGIN                                                 \
 766             PV_SAVE_ALL_CALLER_REGS                                     \
 767             "call " #func ";"                                           \
 768             PV_RESTORE_ALL_CALLER_REGS                                  \
 769             FRAME_END                                                   \
 770             "ret;"                                                      \
 771             ".size " PV_THUNK_NAME(func) ", .-" PV_THUNK_NAME(func) ";" \
 772             ".popsection")
 773
 774 /* Get a reference to a callee-save function */
 775 #define PV_CALLEE_SAVE(func)                                            \
 776         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 777
 778 /* Promise that "func" already uses the right calling convention */
 779 #define __PV_IS_CALLEE_SAVE(func)                       \
 780         ((struct paravirt_callee_save) { func })
 781
 782 static inline notrace unsigned long arch_local_save_flags(void)
 783 {
 784         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 785 }
 786
 787 static inline notrace void arch_local_irq_restore(unsigned long f)
 788 {
 789         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 790 }
 791
 792 static inline notrace void arch_local_irq_disable(void)
 793 {
 794         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 795 }
 796
 797 static inline notrace void arch_local_irq_enable(void)
 798 {
 799         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 800 }
 801
 802 static inline notrace unsigned long arch_local_irq_save(void)
 803 {
 804         unsigned long f;
 805
 806         f = arch_local_save_flags();
 807         arch_local_irq_disable();
 808         return f;
 809 }
 810
 811
 812 /* Make sure as little as possible of this mess escapes. */
 813 #undef PARAVIRT_CALL
 814 #undef __PVOP_CALL
 815 #undef __PVOP_VCALL
 816 #undef PVOP_VCALL0
 817 #undef PVOP_CALL0
 818 #undef PVOP_VCALL1
 819 #undef PVOP_CALL1
 820 #undef PVOP_VCALL2
 821 #undef PVOP_CALL2
 822 #undef PVOP_VCALL3
 823 #undef PVOP_CALL3
 824 #undef PVOP_VCALL4
 825 #undef PVOP_CALL4
 826
 827 extern void default_banner(void);
 828
 829 #else  /* __ASSEMBLY__ */
 830
 831 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 832 771:;                                           \
 833         ops;                                    \
 834 772:;                                           \
 835         .pushsection .parainstructions,"a";     \
 836          .align algn;                           \
 837          word 771b;                             \
 838          .byte ptype;                           \
 839          .byte 772b-771b;                       \
 840          .short clobbers;                       \
 841         .popsection
 842
 843
 844 #define COND_PUSH(set, mask, reg)                       \
 845         .if ((~(set)) & mask); push %reg; .endif
 846 #define COND_POP(set, mask, reg)                        \
 847         .if ((~(set)) & mask); pop %reg; .endif
 848
 849 #ifdef CONFIG_X86_64
 850
 851 #define PV_SAVE_REGS(set)                       \
 852         COND_PUSH(set, CLBR_RAX, rax);          \
 853         COND_PUSH(set, CLBR_RCX, rcx);          \
 854         COND_PUSH(set, CLBR_RDX, rdx);          \
 855         COND_PUSH(set, CLBR_RSI, rsi);          \
 856         COND_PUSH(set, CLBR_RDI, rdi);          \
 857         COND_PUSH(set, CLBR_R8, r8);            \
 858         COND_PUSH(set, CLBR_R9, r9);            \
 859         COND_PUSH(set, CLBR_R10, r10);          \
 860         COND_PUSH(set, CLBR_R11, r11)
 861 #define PV_RESTORE_REGS(set)                    \
 862         COND_POP(set, CLBR_R11, r11);           \
 863         COND_POP(set, CLBR_R10, r10);           \
 864         COND_POP(set, CLBR_R9, r9);             \
 865         COND_POP(set, CLBR_R8, r8);             \
 866         COND_POP(set, CLBR_RDI, rdi);           \
 867         COND_POP(set, CLBR_RSI, rsi);           \
 868         COND_POP(set, CLBR_RDX, rdx);           \
 869         COND_POP(set, CLBR_RCX, rcx);           \
 870         COND_POP(set, CLBR_RAX, rax)
 871
 872 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 873 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 874 #define PARA_INDIRECT(addr)     *addr(%rip)
 875 #else
 876 #define PV_SAVE_REGS(set)                       \
 877         COND_PUSH(set, CLBR_EAX, eax);          \
 878         COND_PUSH(set, CLBR_EDI, edi);          \
 879         COND_PUSH(set, CLBR_ECX, ecx);          \
 880         COND_PUSH(set, CLBR_EDX, edx)
 881 #define PV_RESTORE_REGS(set)                    \
 882         COND_POP(set, CLBR_EDX, edx);           \
 883         COND_POP(set, CLBR_ECX, ecx);           \
 884         COND_POP(set, CLBR_EDI, edi);           \
 885         COND_POP(set, CLBR_EAX, eax)
 886
 887 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 888 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 889 #define PARA_INDIRECT(addr)     *%cs:addr
 890 #endif
 891
 892 #define INTERRUPT_RETURN                                                \
 893         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 894                   ANNOTATE_RETPOLINE_SAFE;                                      \
 895                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret);)
 896
 897 #define DISABLE_INTERRUPTS(clobbers)                                    \
 898         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 899                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 900                   ANNOTATE_RETPOLINE_SAFE;                                      \
 901                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 902                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 903
 904 #define ENABLE_INTERRUPTS(clobbers)                                     \
 905         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 906                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 907                   ANNOTATE_RETPOLINE_SAFE;                                      \
 908                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 909                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 910
 911 #ifdef CONFIG_X86_32
 912 #define GET_CR0_INTO_EAX                                \
 913         push %ecx; push %edx;                           \
 914         ANNOTATE_RETPOLINE_SAFE;                                \
 915         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 916         pop %edx; pop %ecx
 917 #else   /* !CONFIG_X86_32 */
 918
 919 /*
 920  * If swapgs is used while the userspace stack is still current,
 921  * there's no way to call a pvop.  The PV replacement *must* be
 922  * inlined, or the swapgs instruction must be trapped and emulated.
 923  */
 924 #define SWAPGS_UNSAFE_STACK                                             \
 925         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 926                   swapgs)
 927
 928 /*
 929  * Note: swapgs is very special, and in practise is either going to be
 930  * implemented with a single "swapgs" instruction or something very
 931  * special.  Either way, we don't need to save any registers for
 932  * it.
 933  */
 934 #define SWAPGS                                                          \
 935         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 936                   ANNOTATE_RETPOLINE_SAFE;                                      \
 937                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs);         \
 938                  )
 939
 940 #define GET_CR2_INTO_RAX                                \
 941         ANNOTATE_RETPOLINE_SAFE;                                \
 942         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2);
 943
 944 #define USERGS_SYSRET64                                                 \
 945         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
 946                   CLBR_NONE,                                            \
 947                   ANNOTATE_RETPOLINE_SAFE;                                      \
 948                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64);)
 949
 950 #ifdef CONFIG_DEBUG_ENTRY
 951 #define SAVE_FLAGS(clobbers)                                        \
 952         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_save_fl), clobbers, \
 953                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);        \
 954                   ANNOTATE_RETPOLINE_SAFE;                                  \
 955                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_save_fl);    \
 956                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 957 #endif
 958
 959 #endif  /* CONFIG_X86_32 */
 960
 961 #endif /* __ASSEMBLY__ */
 962 #else  /* CONFIG_PARAVIRT */
 963 # define default_banner x86_init_noop
 964 #ifndef __ASSEMBLY__
 965 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 966                                           struct mm_struct *mm)
 967 {
 968 }
 969
 970 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 971 {
 972 }
 973 #endif /* __ASSEMBLY__ */
 974 #endif /* !CONFIG_PARAVIRT */
 975 #endif /* _ASM_X86_PARAVIRT_H */