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