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_CALLEE0(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 static inline void arch_safe_halt(void)
 143 {
 144         PVOP_VCALL0(irq.safe_halt);
 145 }
 146
 147 static inline void halt(void)
 148 {
 149         PVOP_VCALL0(irq.halt);
 150 }
 151
 152 static inline void wbinvd(void)
 153 {
 154         PVOP_VCALL0(cpu.wbinvd);
 155 }
 156
 157 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 158
 159 static inline u64 paravirt_read_msr(unsigned msr)
 160 {
 161         return PVOP_CALL1(u64, cpu.read_msr, msr);
 162 }
 163
 164 static inline void paravirt_write_msr(unsigned msr,
 165                                       unsigned low, unsigned high)
 166 {
 167         PVOP_VCALL3(cpu.write_msr, msr, low, high);
 168 }
 169
 170 static inline u64 paravirt_read_msr_safe(unsigned msr, int *err)
 171 {
 172         return PVOP_CALL2(u64, cpu.read_msr_safe, msr, err);
 173 }
 174
 175 static inline int paravirt_write_msr_safe(unsigned msr,
 176                                           unsigned low, unsigned high)
 177 {
 178         return PVOP_CALL3(int, cpu.write_msr_safe, msr, low, high);
 179 }
 180
 181 #define rdmsr(msr, val1, val2)                  \
 182 do {                                            \
 183         u64 _l = paravirt_read_msr(msr);        \
 184         val1 = (u32)_l;                         \
 185         val2 = _l >> 32;                        \
 186 } while (0)
 187
 188 #define wrmsr(msr, val1, val2)                  \
 189 do {                                            \
 190         paravirt_write_msr(msr, val1, val2);    \
 191 } while (0)
 192
 193 #define rdmsrl(msr, val)                        \
 194 do {                                            \
 195         val = paravirt_read_msr(msr);           \
 196 } while (0)
 197
 198 static inline void wrmsrl(unsigned msr, u64 val)
 199 {
 200         wrmsr(msr, (u32)val, (u32)(val>>32));
 201 }
 202
 203 #define wrmsr_safe(msr, a, b)   paravirt_write_msr_safe(msr, a, b)
 204
 205 /* rdmsr with exception handling */
 206 #define rdmsr_safe(msr, a, b)                           \
 207 ({                                                      \
 208         int _err;                                       \
 209         u64 _l = paravirt_read_msr_safe(msr, &_err);    \
 210         (*a) = (u32)_l;                                 \
 211         (*b) = _l >> 32;                                \
 212         _err;                                           \
 213 })
 214
 215 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 216 {
 217         int err;
 218
 219         *p = paravirt_read_msr_safe(msr, &err);
 220         return err;
 221 }
 222
 223 static inline unsigned long long paravirt_read_pmc(int counter)
 224 {
 225         return PVOP_CALL1(u64, cpu.read_pmc, counter);
 226 }
 227
 228 #define rdpmc(counter, low, high)               \
 229 do {                                            \
 230         u64 _l = paravirt_read_pmc(counter);    \
 231         low = (u32)_l;                          \
 232         high = _l >> 32;                        \
 233 } while (0)
 234
 235 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
 236
 237 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 238 {
 239         PVOP_VCALL2(cpu.alloc_ldt, ldt, entries);
 240 }
 241
 242 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 243 {
 244         PVOP_VCALL2(cpu.free_ldt, ldt, entries);
 245 }
 246
 247 static inline void load_TR_desc(void)
 248 {
 249         PVOP_VCALL0(cpu.load_tr_desc);
 250 }
 251 static inline void load_gdt(const struct desc_ptr *dtr)
 252 {
 253         PVOP_VCALL1(cpu.load_gdt, dtr);
 254 }
 255 static inline void load_idt(const struct desc_ptr *dtr)
 256 {
 257         PVOP_VCALL1(cpu.load_idt, dtr);
 258 }
 259 static inline void set_ldt(const void *addr, unsigned entries)
 260 {
 261         PVOP_VCALL2(cpu.set_ldt, addr, entries);
 262 }
 263 static inline unsigned long paravirt_store_tr(void)
 264 {
 265         return PVOP_CALL0(unsigned long, cpu.store_tr);
 266 }
 267
 268 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 269 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 270 {
 271         PVOP_VCALL2(cpu.load_tls, t, cpu);
 272 }
 273
 274 #ifdef CONFIG_X86_64
 275 static inline void load_gs_index(unsigned int gs)
 276 {
 277         PVOP_VCALL1(cpu.load_gs_index, gs);
 278 }
 279 #endif
 280
 281 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 282                                    const void *desc)
 283 {
 284         PVOP_VCALL3(cpu.write_ldt_entry, dt, entry, desc);
 285 }
 286
 287 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 288                                    void *desc, int type)
 289 {
 290         PVOP_VCALL4(cpu.write_gdt_entry, dt, entry, desc, type);
 291 }
 292
 293 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 294 {
 295         PVOP_VCALL3(cpu.write_idt_entry, dt, entry, g);
 296 }
 297
 298 #ifdef CONFIG_X86_IOPL_IOPERM
 299 static inline void tss_update_io_bitmap(void)
 300 {
 301         PVOP_VCALL0(cpu.update_io_bitmap);
 302 }
 303 #endif
 304
 305 static inline void paravirt_activate_mm(struct mm_struct *prev,
 306                                         struct mm_struct *next)
 307 {
 308         PVOP_VCALL2(mmu.activate_mm, prev, next);
 309 }
 310
 311 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 312                                           struct mm_struct *mm)
 313 {
 314         PVOP_VCALL2(mmu.dup_mmap, oldmm, mm);
 315 }
 316
 317 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 318 {
 319         return PVOP_CALL1(int, mmu.pgd_alloc, mm);
 320 }
 321
 322 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 323 {
 324         PVOP_VCALL2(mmu.pgd_free, mm, pgd);
 325 }
 326
 327 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 328 {
 329         PVOP_VCALL2(mmu.alloc_pte, mm, pfn);
 330 }
 331 static inline void paravirt_release_pte(unsigned long pfn)
 332 {
 333         PVOP_VCALL1(mmu.release_pte, pfn);
 334 }
 335
 336 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 337 {
 338         PVOP_VCALL2(mmu.alloc_pmd, mm, pfn);
 339 }
 340
 341 static inline void paravirt_release_pmd(unsigned long pfn)
 342 {
 343         PVOP_VCALL1(mmu.release_pmd, pfn);
 344 }
 345
 346 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 347 {
 348         PVOP_VCALL2(mmu.alloc_pud, mm, pfn);
 349 }
 350 static inline void paravirt_release_pud(unsigned long pfn)
 351 {
 352         PVOP_VCALL1(mmu.release_pud, pfn);
 353 }
 354
 355 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)
 356 {
 357         PVOP_VCALL2(mmu.alloc_p4d, mm, pfn);
 358 }
 359
 360 static inline void paravirt_release_p4d(unsigned long pfn)
 361 {
 362         PVOP_VCALL1(mmu.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, mmu.make_pte, val, (u64)val >> 32);
 371         else
 372                 ret = PVOP_CALLEE1(pteval_t, mmu.make_pte, val);
 373
 374         return (pte_t) { .pte = ret };
 375 }
 376
 377 static inline pteval_t pte_val(pte_t pte)
 378 {
 379         pteval_t ret;
 380
 381         if (sizeof(pteval_t) > sizeof(long))
 382                 ret = PVOP_CALLEE2(pteval_t, mmu.pte_val,
 383                                    pte.pte, (u64)pte.pte >> 32);
 384         else
 385                 ret = PVOP_CALLEE1(pteval_t, mmu.pte_val, pte.pte);
 386
 387         return ret;
 388 }
 389
 390 static inline pgd_t __pgd(pgdval_t val)
 391 {
 392         pgdval_t ret;
 393
 394         if (sizeof(pgdval_t) > sizeof(long))
 395                 ret = PVOP_CALLEE2(pgdval_t, mmu.make_pgd, val, (u64)val >> 32);
 396         else
 397                 ret = PVOP_CALLEE1(pgdval_t, mmu.make_pgd, val);
 398
 399         return (pgd_t) { ret };
 400 }
 401
 402 static inline pgdval_t pgd_val(pgd_t pgd)
 403 {
 404         pgdval_t ret;
 405
 406         if (sizeof(pgdval_t) > sizeof(long))
 407                 ret =  PVOP_CALLEE2(pgdval_t, mmu.pgd_val,
 408                                     pgd.pgd, (u64)pgd.pgd >> 32);
 409         else
 410                 ret =  PVOP_CALLEE1(pgdval_t, mmu.pgd_val, pgd.pgd);
 411
 412         return ret;
 413 }
 414
 415 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 416 static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr,
 417                                            pte_t *ptep)
 418 {
 419         pteval_t ret;
 420
 421         ret = PVOP_CALL3(pteval_t, mmu.ptep_modify_prot_start, vma, addr, ptep);
 422
 423         return (pte_t) { .pte = ret };
 424 }
 425
 426 static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
 427                                            pte_t *ptep, pte_t old_pte, pte_t pte)
 428 {
 429
 430         if (sizeof(pteval_t) > sizeof(long))
 431                 /* 5 arg words */
 432                 pv_ops.mmu.ptep_modify_prot_commit(vma, addr, ptep, pte);
 433         else
 434                 PVOP_VCALL4(mmu.ptep_modify_prot_commit,
 435                             vma, addr, ptep, pte.pte);
 436 }
 437
 438 static inline void set_pte(pte_t *ptep, pte_t pte)
 439 {
 440         if (sizeof(pteval_t) > sizeof(long))
 441                 PVOP_VCALL3(mmu.set_pte, ptep, pte.pte, (u64)pte.pte >> 32);
 442         else
 443                 PVOP_VCALL2(mmu.set_pte, ptep, pte.pte);
 444 }
 445
 446 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 447                               pte_t *ptep, pte_t pte)
 448 {
 449         if (sizeof(pteval_t) > sizeof(long))
 450                 /* 5 arg words */
 451                 pv_ops.mmu.set_pte_at(mm, addr, ptep, pte);
 452         else
 453                 PVOP_VCALL4(mmu.set_pte_at, mm, addr, ptep, pte.pte);
 454 }
 455
 456 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 457 {
 458         pmdval_t val = native_pmd_val(pmd);
 459
 460         if (sizeof(pmdval_t) > sizeof(long))
 461                 PVOP_VCALL3(mmu.set_pmd, pmdp, val, (u64)val >> 32);
 462         else
 463                 PVOP_VCALL2(mmu.set_pmd, pmdp, val);
 464 }
 465
 466 #if CONFIG_PGTABLE_LEVELS >= 3
 467 static inline pmd_t __pmd(pmdval_t val)
 468 {
 469         pmdval_t ret;
 470
 471         if (sizeof(pmdval_t) > sizeof(long))
 472                 ret = PVOP_CALLEE2(pmdval_t, mmu.make_pmd, val, (u64)val >> 32);
 473         else
 474                 ret = PVOP_CALLEE1(pmdval_t, mmu.make_pmd, val);
 475
 476         return (pmd_t) { ret };
 477 }
 478
 479 static inline pmdval_t pmd_val(pmd_t pmd)
 480 {
 481         pmdval_t ret;
 482
 483         if (sizeof(pmdval_t) > sizeof(long))
 484                 ret =  PVOP_CALLEE2(pmdval_t, mmu.pmd_val,
 485                                     pmd.pmd, (u64)pmd.pmd >> 32);
 486         else
 487                 ret =  PVOP_CALLEE1(pmdval_t, mmu.pmd_val, pmd.pmd);
 488
 489         return ret;
 490 }
 491
 492 static inline void set_pud(pud_t *pudp, pud_t pud)
 493 {
 494         pudval_t val = native_pud_val(pud);
 495
 496         if (sizeof(pudval_t) > sizeof(long))
 497                 PVOP_VCALL3(mmu.set_pud, pudp, val, (u64)val >> 32);
 498         else
 499                 PVOP_VCALL2(mmu.set_pud, pudp, val);
 500 }
 501 #if CONFIG_PGTABLE_LEVELS >= 4
 502 static inline pud_t __pud(pudval_t val)
 503 {
 504         pudval_t ret;
 505
 506         ret = PVOP_CALLEE1(pudval_t, mmu.make_pud, val);
 507
 508         return (pud_t) { ret };
 509 }
 510
 511 static inline pudval_t pud_val(pud_t pud)
 512 {
 513         return PVOP_CALLEE1(pudval_t, mmu.pud_val, pud.pud);
 514 }
 515
 516 static inline void pud_clear(pud_t *pudp)
 517 {
 518         set_pud(pudp, __pud(0));
 519 }
 520
 521 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
 522 {
 523         p4dval_t val = native_p4d_val(p4d);
 524
 525         PVOP_VCALL2(mmu.set_p4d, p4dp, val);
 526 }
 527
 528 #if CONFIG_PGTABLE_LEVELS >= 5
 529
 530 static inline p4d_t __p4d(p4dval_t val)
 531 {
 532         p4dval_t ret = PVOP_CALLEE1(p4dval_t, mmu.make_p4d, val);
 533
 534         return (p4d_t) { ret };
 535 }
 536
 537 static inline p4dval_t p4d_val(p4d_t p4d)
 538 {
 539         return PVOP_CALLEE1(p4dval_t, mmu.p4d_val, p4d.p4d);
 540 }
 541
 542 static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
 543 {
 544         PVOP_VCALL2(mmu.set_pgd, pgdp, native_pgd_val(pgd));
 545 }
 546
 547 #define set_pgd(pgdp, pgdval) do {                                      \
 548         if (pgtable_l5_enabled())                                               \
 549                 __set_pgd(pgdp, pgdval);                                \
 550         else                                                            \
 551                 set_p4d((p4d_t *)(pgdp), (p4d_t) { (pgdval).pgd });     \
 552 } while (0)
 553
 554 #define pgd_clear(pgdp) do {                                            \
 555         if (pgtable_l5_enabled())                                               \
 556                 set_pgd(pgdp, __pgd(0));                                \
 557 } while (0)
 558
 559 #endif  /* CONFIG_PGTABLE_LEVELS == 5 */
 560
 561 static inline void p4d_clear(p4d_t *p4dp)
 562 {
 563         set_p4d(p4dp, __p4d(0));
 564 }
 565
 566 #endif  /* CONFIG_PGTABLE_LEVELS == 4 */
 567
 568 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 569
 570 #ifdef CONFIG_X86_PAE
 571 /* Special-case pte-setting operations for PAE, which can't update a
 572    64-bit pte atomically */
 573 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 574 {
 575         PVOP_VCALL3(mmu.set_pte_atomic, ptep, pte.pte, pte.pte >> 32);
 576 }
 577
 578 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 579                              pte_t *ptep)
 580 {
 581         PVOP_VCALL3(mmu.pte_clear, mm, addr, ptep);
 582 }
 583
 584 static inline void pmd_clear(pmd_t *pmdp)
 585 {
 586         PVOP_VCALL1(mmu.pmd_clear, pmdp);
 587 }
 588 #else  /* !CONFIG_X86_PAE */
 589 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 590 {
 591         set_pte(ptep, pte);
 592 }
 593
 594 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 595                              pte_t *ptep)
 596 {
 597         set_pte_at(mm, addr, ptep, __pte(0));
 598 }
 599
 600 static inline void pmd_clear(pmd_t *pmdp)
 601 {
 602         set_pmd(pmdp, __pmd(0));
 603 }
 604 #endif  /* CONFIG_X86_PAE */
 605
 606 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 607 static inline void arch_start_context_switch(struct task_struct *prev)
 608 {
 609         PVOP_VCALL1(cpu.start_context_switch, prev);
 610 }
 611
 612 static inline void arch_end_context_switch(struct task_struct *next)
 613 {
 614         PVOP_VCALL1(cpu.end_context_switch, next);
 615 }
 616
 617 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 618 static inline void arch_enter_lazy_mmu_mode(void)
 619 {
 620         PVOP_VCALL0(mmu.lazy_mode.enter);
 621 }
 622
 623 static inline void arch_leave_lazy_mmu_mode(void)
 624 {
 625         PVOP_VCALL0(mmu.lazy_mode.leave);
 626 }
 627
 628 static inline void arch_flush_lazy_mmu_mode(void)
 629 {
 630         PVOP_VCALL0(mmu.lazy_mode.flush);
 631 }
 632
 633 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 634                                 phys_addr_t phys, pgprot_t flags)
 635 {
 636         pv_ops.mmu.set_fixmap(idx, phys, flags);
 637 }
 638 #endif
 639
 640 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 641
 642 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
 643                                                         u32 val)
 644 {
 645         PVOP_VCALL2(lock.queued_spin_lock_slowpath, lock, val);
 646 }
 647
 648 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
 649 {
 650         PVOP_VCALLEE1(lock.queued_spin_unlock, lock);
 651 }
 652
 653 static __always_inline void pv_wait(u8 *ptr, u8 val)
 654 {
 655         PVOP_VCALL2(lock.wait, ptr, val);
 656 }
 657
 658 static __always_inline void pv_kick(int cpu)
 659 {
 660         PVOP_VCALL1(lock.kick, cpu);
 661 }
 662
 663 static __always_inline bool pv_vcpu_is_preempted(long cpu)
 664 {
 665         return PVOP_CALLEE1(bool, lock.vcpu_is_preempted, cpu);
 666 }
 667
 668 void __raw_callee_save___native_queued_spin_unlock(struct qspinlock *lock);
 669 bool __raw_callee_save___native_vcpu_is_preempted(long cpu);
 670
 671 #endif /* SMP && PARAVIRT_SPINLOCKS */
 672
 673 #ifdef CONFIG_X86_32
 674 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 675 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 676
 677 /* save and restore all caller-save registers, except return value */
 678 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 679 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 680
 681 #define PV_FLAGS_ARG "0"
 682 #define PV_EXTRA_CLOBBERS
 683 #define PV_VEXTRA_CLOBBERS
 684 #else
 685 /* save and restore all caller-save registers, except return value */
 686 #define PV_SAVE_ALL_CALLER_REGS                                         \
 687         "push %rcx;"                                                    \
 688         "push %rdx;"                                                    \
 689         "push %rsi;"                                                    \
 690         "push %rdi;"                                                    \
 691         "push %r8;"                                                     \
 692         "push %r9;"                                                     \
 693         "push %r10;"                                                    \
 694         "push %r11;"
 695 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 696         "pop %r11;"                                                     \
 697         "pop %r10;"                                                     \
 698         "pop %r9;"                                                      \
 699         "pop %r8;"                                                      \
 700         "pop %rdi;"                                                     \
 701         "pop %rsi;"                                                     \
 702         "pop %rdx;"                                                     \
 703         "pop %rcx;"
 704
 705 /* We save some registers, but all of them, that's too much. We clobber all
 706  * caller saved registers but the argument parameter */
 707 #define PV_SAVE_REGS "pushq %%rdi;"
 708 #define PV_RESTORE_REGS "popq %%rdi;"
 709 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 710 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 711 #define PV_FLAGS_ARG "D"
 712 #endif
 713
 714 /*
 715  * Generate a thunk around a function which saves all caller-save
 716  * registers except for the return value.  This allows C functions to
 717  * be called from assembler code where fewer than normal registers are
 718  * available.  It may also help code generation around calls from C
 719  * code if the common case doesn't use many registers.
 720  *
 721  * When a callee is wrapped in a thunk, the caller can assume that all
 722  * arg regs and all scratch registers are preserved across the
 723  * call. The return value in rax/eax will not be saved, even for void
 724  * functions.
 725  */
 726 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
 727 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 728         extern typeof(func) __raw_callee_save_##func;                   \
 729                                                                         \
 730         asm(".pushsection .text;"                                       \
 731             ".globl " PV_THUNK_NAME(func) ";"                           \
 732             ".type " PV_THUNK_NAME(func) ", @function;"                 \
 733             PV_THUNK_NAME(func) ":"                                     \
 734             FRAME_BEGIN                                                 \
 735             PV_SAVE_ALL_CALLER_REGS                                     \
 736             "call " #func ";"                                           \
 737             PV_RESTORE_ALL_CALLER_REGS                                  \
 738             FRAME_END                                                   \
 739             "ret;"                                                      \
 740             ".size " PV_THUNK_NAME(func) ", .-" PV_THUNK_NAME(func) ";" \
 741             ".popsection")
 742
 743 /* Get a reference to a callee-save function */
 744 #define PV_CALLEE_SAVE(func)                                            \
 745         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 746
 747 /* Promise that "func" already uses the right calling convention */
 748 #define __PV_IS_CALLEE_SAVE(func)                       \
 749         ((struct paravirt_callee_save) { func })
 750
 751 #ifdef CONFIG_PARAVIRT_XXL
 752 static inline notrace unsigned long arch_local_save_flags(void)
 753 {
 754         return PVOP_CALLEE0(unsigned long, irq.save_fl);
 755 }
 756
 757 static inline notrace void arch_local_irq_restore(unsigned long f)
 758 {
 759         PVOP_VCALLEE1(irq.restore_fl, f);
 760 }
 761
 762 static inline notrace void arch_local_irq_disable(void)
 763 {
 764         PVOP_VCALLEE0(irq.irq_disable);
 765 }
 766
 767 static inline notrace void arch_local_irq_enable(void)
 768 {
 769         PVOP_VCALLEE0(irq.irq_enable);
 770 }
 771
 772 static inline notrace unsigned long arch_local_irq_save(void)
 773 {
 774         unsigned long f;
 775
 776         f = arch_local_save_flags();
 777         arch_local_irq_disable();
 778         return f;
 779 }
 780 #endif
 781
 782
 783 /* Make sure as little as possible of this mess escapes. */
 784 #undef PARAVIRT_CALL
 785 #undef __PVOP_CALL
 786 #undef __PVOP_VCALL
 787 #undef PVOP_VCALL0
 788 #undef PVOP_CALL0
 789 #undef PVOP_VCALL1
 790 #undef PVOP_CALL1
 791 #undef PVOP_VCALL2
 792 #undef PVOP_CALL2
 793 #undef PVOP_VCALL3
 794 #undef PVOP_CALL3
 795 #undef PVOP_VCALL4
 796 #undef PVOP_CALL4
 797
 798 extern void default_banner(void);
 799
 800 #else  /* __ASSEMBLY__ */
 801
 802 #define _PVSITE(ptype, ops, word, algn)         \
 803 771:;                                           \
 804         ops;                                    \
 805 772:;                                           \
 806         .pushsection .parainstructions,"a";     \
 807          .align algn;                           \
 808          word 771b;                             \
 809          .byte ptype;                           \
 810          .byte 772b-771b;                       \
 811         .popsection
 812
 813
 814 #define COND_PUSH(set, mask, reg)                       \
 815         .if ((~(set)) & mask); push %reg; .endif
 816 #define COND_POP(set, mask, reg)                        \
 817         .if ((~(set)) & mask); pop %reg; .endif
 818
 819 #ifdef CONFIG_X86_64
 820
 821 #define PV_SAVE_REGS(set)                       \
 822         COND_PUSH(set, CLBR_RAX, rax);          \
 823         COND_PUSH(set, CLBR_RCX, rcx);          \
 824         COND_PUSH(set, CLBR_RDX, rdx);          \
 825         COND_PUSH(set, CLBR_RSI, rsi);          \
 826         COND_PUSH(set, CLBR_RDI, rdi);          \
 827         COND_PUSH(set, CLBR_R8, r8);            \
 828         COND_PUSH(set, CLBR_R9, r9);            \
 829         COND_PUSH(set, CLBR_R10, r10);          \
 830         COND_PUSH(set, CLBR_R11, r11)
 831 #define PV_RESTORE_REGS(set)                    \
 832         COND_POP(set, CLBR_R11, r11);           \
 833         COND_POP(set, CLBR_R10, r10);           \
 834         COND_POP(set, CLBR_R9, r9);             \
 835         COND_POP(set, CLBR_R8, r8);             \
 836         COND_POP(set, CLBR_RDI, rdi);           \
 837         COND_POP(set, CLBR_RSI, rsi);           \
 838         COND_POP(set, CLBR_RDX, rdx);           \
 839         COND_POP(set, CLBR_RCX, rcx);           \
 840         COND_POP(set, CLBR_RAX, rax)
 841
 842 #define PARA_PATCH(off)         ((off) / 8)
 843 #define PARA_SITE(ptype, ops)   _PVSITE(ptype, ops, .quad, 8)
 844 #define PARA_INDIRECT(addr)     *addr(%rip)
 845 #else
 846 #define PV_SAVE_REGS(set)                       \
 847         COND_PUSH(set, CLBR_EAX, eax);          \
 848         COND_PUSH(set, CLBR_EDI, edi);          \
 849         COND_PUSH(set, CLBR_ECX, ecx);          \
 850         COND_PUSH(set, CLBR_EDX, edx)
 851 #define PV_RESTORE_REGS(set)                    \
 852         COND_POP(set, CLBR_EDX, edx);           \
 853         COND_POP(set, CLBR_ECX, ecx);           \
 854         COND_POP(set, CLBR_EDI, edi);           \
 855         COND_POP(set, CLBR_EAX, eax)
 856
 857 #define PARA_PATCH(off)         ((off) / 4)
 858 #define PARA_SITE(ptype, ops)   _PVSITE(ptype, ops, .long, 4)
 859 #define PARA_INDIRECT(addr)     *%cs:addr
 860 #endif
 861
 862 #ifdef CONFIG_PARAVIRT_XXL
 863 #define INTERRUPT_RETURN                                                \
 864         PARA_SITE(PARA_PATCH(PV_CPU_iret),                              \
 865                   ANNOTATE_RETPOLINE_SAFE;                              \
 866                   jmp PARA_INDIRECT(pv_ops+PV_CPU_iret);)
 867
 868 #define DISABLE_INTERRUPTS(clobbers)                                    \
 869         PARA_SITE(PARA_PATCH(PV_IRQ_irq_disable),                       \
 870                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 871                   ANNOTATE_RETPOLINE_SAFE;                              \
 872                   call PARA_INDIRECT(pv_ops+PV_IRQ_irq_disable);        \
 873                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 874
 875 #define ENABLE_INTERRUPTS(clobbers)                                     \
 876         PARA_SITE(PARA_PATCH(PV_IRQ_irq_enable),                        \
 877                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 878                   ANNOTATE_RETPOLINE_SAFE;                              \
 879                   call PARA_INDIRECT(pv_ops+PV_IRQ_irq_enable);         \
 880                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 881 #endif
 882
 883 #ifdef CONFIG_X86_64
 884 #ifdef CONFIG_PARAVIRT_XXL
 885 /*
 886  * If swapgs is used while the userspace stack is still current,
 887  * there's no way to call a pvop.  The PV replacement *must* be
 888  * inlined, or the swapgs instruction must be trapped and emulated.
 889  */
 890 #define SWAPGS_UNSAFE_STACK                                             \
 891         PARA_SITE(PARA_PATCH(PV_CPU_swapgs), swapgs)
 892
 893 /*
 894  * Note: swapgs is very special, and in practise is either going to be
 895  * implemented with a single "swapgs" instruction or something very
 896  * special.  Either way, we don't need to save any registers for
 897  * it.
 898  */
 899 #define SWAPGS                                                          \
 900         PARA_SITE(PARA_PATCH(PV_CPU_swapgs),                            \
 901                   ANNOTATE_RETPOLINE_SAFE;                              \
 902                   call PARA_INDIRECT(pv_ops+PV_CPU_swapgs);             \
 903                  )
 904
 905 #define USERGS_SYSRET64                                                 \
 906         PARA_SITE(PARA_PATCH(PV_CPU_usergs_sysret64),                   \
 907                   ANNOTATE_RETPOLINE_SAFE;                              \
 908                   jmp PARA_INDIRECT(pv_ops+PV_CPU_usergs_sysret64);)
 909
 910 #ifdef CONFIG_DEBUG_ENTRY
 911 #define SAVE_FLAGS(clobbers)                                        \
 912         PARA_SITE(PARA_PATCH(PV_IRQ_save_fl),                       \
 913                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);        \
 914                   ANNOTATE_RETPOLINE_SAFE;                          \
 915                   call PARA_INDIRECT(pv_ops+PV_IRQ_save_fl);        \
 916                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 917 #endif
 918 #endif /* CONFIG_PARAVIRT_XXL */
 919 #endif  /* CONFIG_X86_64 */
 920
 921 #ifdef CONFIG_PARAVIRT_XXL
 922
 923 #define GET_CR2_INTO_AX                                                 \
 924         PARA_SITE(PARA_PATCH(PV_MMU_read_cr2),                          \
 925                   ANNOTATE_RETPOLINE_SAFE;                              \
 926                   call PARA_INDIRECT(pv_ops+PV_MMU_read_cr2);           \
 927                  )
 928
 929 #endif /* CONFIG_PARAVIRT_XXL */
 930
 931
 932 #endif /* __ASSEMBLY__ */
 933 #else  /* CONFIG_PARAVIRT */
 934 # define default_banner x86_init_noop
 935 #endif /* !CONFIG_PARAVIRT */
 936
 937 #ifndef __ASSEMBLY__
 938 #ifndef CONFIG_PARAVIRT_XXL
 939 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 940                                           struct mm_struct *mm)
 941 {
 942 }
 943 #endif
 944
 945 #ifndef CONFIG_PARAVIRT
 946 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 947 {
 948 }
 949 #endif
 950 #endif /* __ASSEMBLY__ */
 951 #endif /* _ASM_X86_PARAVIRT_H */