root/arch/x86/include/asm/paravirt_types.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PARAVIRT_TYPES_H
   3 #define _ASM_X86_PARAVIRT_TYPES_H
   4 
   5 /* Bitmask of what can be clobbered: usually at least eax. */
   6 #define CLBR_NONE 0
   7 #define CLBR_EAX  (1 << 0)
   8 #define CLBR_ECX  (1 << 1)
   9 #define CLBR_EDX  (1 << 2)
  10 #define CLBR_EDI  (1 << 3)
  11 
  12 #ifdef CONFIG_X86_32
  13 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
  14 #define CLBR_ANY  ((1 << 4) - 1)
  15 
  16 #define CLBR_ARG_REGS   (CLBR_EAX | CLBR_EDX | CLBR_ECX)
  17 #define CLBR_RET_REG    (CLBR_EAX | CLBR_EDX)
  18 #define CLBR_SCRATCH    (0)
  19 #else
  20 #define CLBR_RAX  CLBR_EAX
  21 #define CLBR_RCX  CLBR_ECX
  22 #define CLBR_RDX  CLBR_EDX
  23 #define CLBR_RDI  CLBR_EDI
  24 #define CLBR_RSI  (1 << 4)
  25 #define CLBR_R8   (1 << 5)
  26 #define CLBR_R9   (1 << 6)
  27 #define CLBR_R10  (1 << 7)
  28 #define CLBR_R11  (1 << 8)
  29 
  30 #define CLBR_ANY  ((1 << 9) - 1)
  31 
  32 #define CLBR_ARG_REGS   (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
  33                          CLBR_RCX | CLBR_R8 | CLBR_R9)
  34 #define CLBR_RET_REG    (CLBR_RAX)
  35 #define CLBR_SCRATCH    (CLBR_R10 | CLBR_R11)
  36 
  37 #endif /* X86_64 */
  38 
  39 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
  40 
  41 #ifndef __ASSEMBLY__
  42 
  43 #include <asm/desc_defs.h>
  44 #include <asm/kmap_types.h>
  45 #include <asm/pgtable_types.h>
  46 #include <asm/nospec-branch.h>
  47 
  48 struct page;
  49 struct thread_struct;
  50 struct desc_ptr;
  51 struct tss_struct;
  52 struct mm_struct;
  53 struct desc_struct;
  54 struct task_struct;
  55 struct cpumask;
  56 struct flush_tlb_info;
  57 struct mmu_gather;
  58 struct vm_area_struct;
  59 
  60 /*
  61  * Wrapper type for pointers to code which uses the non-standard
  62  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
  63  */
  64 struct paravirt_callee_save {
  65         void *func;
  66 };
  67 
  68 /* general info */
  69 struct pv_info {
  70 #ifdef CONFIG_PARAVIRT_XXL
  71         unsigned int kernel_rpl;
  72         int shared_kernel_pmd;
  73 
  74 #ifdef CONFIG_X86_64
  75         u16 extra_user_64bit_cs;  /* __USER_CS if none */
  76 #endif
  77 #endif
  78 
  79         const char *name;
  80 };
  81 
  82 struct pv_init_ops {
  83         /*
  84          * Patch may replace one of the defined code sequences with
  85          * arbitrary code, subject to the same register constraints.
  86          * This generally means the code is not free to clobber any
  87          * registers other than EAX.  The patch function should return
  88          * the number of bytes of code generated, as we nop pad the
  89          * rest in generic code.
  90          */
  91         unsigned (*patch)(u8 type, void *insn_buff,
  92                           unsigned long addr, unsigned len);
  93 } __no_randomize_layout;
  94 
  95 #ifdef CONFIG_PARAVIRT_XXL
  96 struct pv_lazy_ops {
  97         /* Set deferred update mode, used for batching operations. */
  98         void (*enter)(void);
  99         void (*leave)(void);
 100         void (*flush)(void);
 101 } __no_randomize_layout;
 102 #endif
 103 
 104 struct pv_time_ops {
 105         unsigned long long (*sched_clock)(void);
 106         unsigned long long (*steal_clock)(int cpu);
 107 } __no_randomize_layout;
 108 
 109 struct pv_cpu_ops {
 110         /* hooks for various privileged instructions */
 111         void (*io_delay)(void);
 112 
 113 #ifdef CONFIG_PARAVIRT_XXL
 114         unsigned long (*get_debugreg)(int regno);
 115         void (*set_debugreg)(int regno, unsigned long value);
 116 
 117         unsigned long (*read_cr0)(void);
 118         void (*write_cr0)(unsigned long);
 119 
 120         void (*write_cr4)(unsigned long);
 121 
 122         /* Segment descriptor handling */
 123         void (*load_tr_desc)(void);
 124         void (*load_gdt)(const struct desc_ptr *);
 125         void (*load_idt)(const struct desc_ptr *);
 126         void (*set_ldt)(const void *desc, unsigned entries);
 127         unsigned long (*store_tr)(void);
 128         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 129 #ifdef CONFIG_X86_64
 130         void (*load_gs_index)(unsigned int idx);
 131 #endif
 132         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
 133                                 const void *desc);
 134         void (*write_gdt_entry)(struct desc_struct *,
 135                                 int entrynum, const void *desc, int size);
 136         void (*write_idt_entry)(gate_desc *,
 137                                 int entrynum, const gate_desc *gate);
 138         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
 139         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
 140 
 141         void (*load_sp0)(unsigned long sp0);
 142 
 143         void (*set_iopl_mask)(unsigned mask);
 144 
 145         void (*wbinvd)(void);
 146 
 147         /* cpuid emulation, mostly so that caps bits can be disabled */
 148         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
 149                       unsigned int *ecx, unsigned int *edx);
 150 
 151         /* Unsafe MSR operations.  These will warn or panic on failure. */
 152         u64 (*read_msr)(unsigned int msr);
 153         void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
 154 
 155         /*
 156          * Safe MSR operations.
 157          * read sets err to 0 or -EIO.  write returns 0 or -EIO.
 158          */
 159         u64 (*read_msr_safe)(unsigned int msr, int *err);
 160         int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
 161 
 162         u64 (*read_pmc)(int counter);
 163 
 164         /*
 165          * Switch to usermode gs and return to 64-bit usermode using
 166          * sysret.  Only used in 64-bit kernels to return to 64-bit
 167          * processes.  Usermode register state, including %rsp, must
 168          * already be restored.
 169          */
 170         void (*usergs_sysret64)(void);
 171 
 172         /* Normal iret.  Jump to this with the standard iret stack
 173            frame set up. */
 174         void (*iret)(void);
 175 
 176         void (*swapgs)(void);
 177 
 178         void (*start_context_switch)(struct task_struct *prev);
 179         void (*end_context_switch)(struct task_struct *next);
 180 #endif
 181 } __no_randomize_layout;
 182 
 183 struct pv_irq_ops {
 184 #ifdef CONFIG_PARAVIRT_XXL
 185         /*
 186          * Get/set interrupt state.  save_fl and restore_fl are only
 187          * expected to use X86_EFLAGS_IF; all other bits
 188          * returned from save_fl are undefined, and may be ignored by
 189          * restore_fl.
 190          *
 191          * NOTE: These functions callers expect the callee to preserve
 192          * more registers than the standard C calling convention.
 193          */
 194         struct paravirt_callee_save save_fl;
 195         struct paravirt_callee_save restore_fl;
 196         struct paravirt_callee_save irq_disable;
 197         struct paravirt_callee_save irq_enable;
 198 
 199         void (*safe_halt)(void);
 200         void (*halt)(void);
 201 #endif
 202 } __no_randomize_layout;
 203 
 204 struct pv_mmu_ops {
 205         /* TLB operations */
 206         void (*flush_tlb_user)(void);
 207         void (*flush_tlb_kernel)(void);
 208         void (*flush_tlb_one_user)(unsigned long addr);
 209         void (*flush_tlb_others)(const struct cpumask *cpus,
 210                                  const struct flush_tlb_info *info);
 211 
 212         void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);
 213 
 214         /* Hook for intercepting the destruction of an mm_struct. */
 215         void (*exit_mmap)(struct mm_struct *mm);
 216 
 217 #ifdef CONFIG_PARAVIRT_XXL
 218         struct paravirt_callee_save read_cr2;
 219         void (*write_cr2)(unsigned long);
 220 
 221         unsigned long (*read_cr3)(void);
 222         void (*write_cr3)(unsigned long);
 223 
 224         /* Hooks for intercepting the creation/use of an mm_struct. */
 225         void (*activate_mm)(struct mm_struct *prev,
 226                             struct mm_struct *next);
 227         void (*dup_mmap)(struct mm_struct *oldmm,
 228                          struct mm_struct *mm);
 229 
 230         /* Hooks for allocating and freeing a pagetable top-level */
 231         int  (*pgd_alloc)(struct mm_struct *mm);
 232         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
 233 
 234         /*
 235          * Hooks for allocating/releasing pagetable pages when they're
 236          * attached to a pagetable
 237          */
 238         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
 239         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
 240         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
 241         void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
 242         void (*release_pte)(unsigned long pfn);
 243         void (*release_pmd)(unsigned long pfn);
 244         void (*release_pud)(unsigned long pfn);
 245         void (*release_p4d)(unsigned long pfn);
 246 
 247         /* Pagetable manipulation functions */
 248         void (*set_pte)(pte_t *ptep, pte_t pteval);
 249         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
 250                            pte_t *ptep, pte_t pteval);
 251         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
 252 
 253         pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr,
 254                                         pte_t *ptep);
 255         void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, unsigned long addr,
 256                                         pte_t *ptep, pte_t pte);
 257 
 258         struct paravirt_callee_save pte_val;
 259         struct paravirt_callee_save make_pte;
 260 
 261         struct paravirt_callee_save pgd_val;
 262         struct paravirt_callee_save make_pgd;
 263 
 264 #if CONFIG_PGTABLE_LEVELS >= 3
 265 #ifdef CONFIG_X86_PAE
 266         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 267         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
 268                           pte_t *ptep);
 269         void (*pmd_clear)(pmd_t *pmdp);
 270 
 271 #endif  /* CONFIG_X86_PAE */
 272 
 273         void (*set_pud)(pud_t *pudp, pud_t pudval);
 274 
 275         struct paravirt_callee_save pmd_val;
 276         struct paravirt_callee_save make_pmd;
 277 
 278 #if CONFIG_PGTABLE_LEVELS >= 4
 279         struct paravirt_callee_save pud_val;
 280         struct paravirt_callee_save make_pud;
 281 
 282         void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
 283 
 284 #if CONFIG_PGTABLE_LEVELS >= 5
 285         struct paravirt_callee_save p4d_val;
 286         struct paravirt_callee_save make_p4d;
 287 
 288         void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
 289 #endif  /* CONFIG_PGTABLE_LEVELS >= 5 */
 290 
 291 #endif  /* CONFIG_PGTABLE_LEVELS >= 4 */
 292 
 293 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 294 
 295         struct pv_lazy_ops lazy_mode;
 296 
 297         /* dom0 ops */
 298 
 299         /* Sometimes the physical address is a pfn, and sometimes its
 300            an mfn.  We can tell which is which from the index. */
 301         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 302                            phys_addr_t phys, pgprot_t flags);
 303 #endif
 304 } __no_randomize_layout;
 305 
 306 struct arch_spinlock;
 307 #ifdef CONFIG_SMP
 308 #include <asm/spinlock_types.h>
 309 #endif
 310 
 311 struct qspinlock;
 312 
 313 struct pv_lock_ops {
 314         void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
 315         struct paravirt_callee_save queued_spin_unlock;
 316 
 317         void (*wait)(u8 *ptr, u8 val);
 318         void (*kick)(int cpu);
 319 
 320         struct paravirt_callee_save vcpu_is_preempted;
 321 } __no_randomize_layout;
 322 
 323 /* This contains all the paravirt structures: we get a convenient
 324  * number for each function using the offset which we use to indicate
 325  * what to patch. */
 326 struct paravirt_patch_template {
 327         struct pv_init_ops      init;
 328         struct pv_time_ops      time;
 329         struct pv_cpu_ops       cpu;
 330         struct pv_irq_ops       irq;
 331         struct pv_mmu_ops       mmu;
 332         struct pv_lock_ops      lock;
 333 } __no_randomize_layout;
 334 
 335 extern struct pv_info pv_info;
 336 extern struct paravirt_patch_template pv_ops;
 337 
 338 #define PARAVIRT_PATCH(x)                                       \
 339         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
 340 
 341 #define paravirt_type(op)                               \
 342         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
 343         [paravirt_opptr] "i" (&(pv_ops.op))
 344 #define paravirt_clobber(clobber)               \
 345         [paravirt_clobber] "i" (clobber)
 346 
 347 /*
 348  * Generate some code, and mark it as patchable by the
 349  * apply_paravirt() alternate instruction patcher.
 350  */
 351 #define _paravirt_alt(insn_string, type, clobber)       \
 352         "771:\n\t" insn_string "\n" "772:\n"            \
 353         ".pushsection .parainstructions,\"a\"\n"        \
 354         _ASM_ALIGN "\n"                                 \
 355         _ASM_PTR " 771b\n"                              \
 356         "  .byte " type "\n"                            \
 357         "  .byte 772b-771b\n"                           \
 358         "  .short " clobber "\n"                        \
 359         ".popsection\n"
 360 
 361 /* Generate patchable code, with the default asm parameters. */
 362 #define paravirt_alt(insn_string)                                       \
 363         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 364 
 365 /* Simple instruction patching code. */
 366 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
 367 
 368 unsigned paravirt_patch_ident_64(void *insn_buff, unsigned len);
 369 unsigned paravirt_patch_default(u8 type, void *insn_buff, unsigned long addr, unsigned len);
 370 unsigned paravirt_patch_insns(void *insn_buff, unsigned len, const char *start, const char *end);
 371 
 372 unsigned native_patch(u8 type, void *insn_buff, unsigned long addr, unsigned len);
 373 
 374 int paravirt_disable_iospace(void);
 375 
 376 /*
 377  * This generates an indirect call based on the operation type number.
 378  * The type number, computed in PARAVIRT_PATCH, is derived from the
 379  * offset into the paravirt_patch_template structure, and can therefore be
 380  * freely converted back into a structure offset.
 381  */
 382 #define PARAVIRT_CALL                                   \
 383         ANNOTATE_RETPOLINE_SAFE                         \
 384         "call *%c[paravirt_opptr];"
 385 
 386 /*
 387  * These macros are intended to wrap calls through one of the paravirt
 388  * ops structs, so that they can be later identified and patched at
 389  * runtime.
 390  *
 391  * Normally, a call to a pv_op function is a simple indirect call:
 392  * (pv_op_struct.operations)(args...).
 393  *
 394  * Unfortunately, this is a relatively slow operation for modern CPUs,
 395  * because it cannot necessarily determine what the destination
 396  * address is.  In this case, the address is a runtime constant, so at
 397  * the very least we can patch the call to e a simple direct call, or
 398  * ideally, patch an inline implementation into the callsite.  (Direct
 399  * calls are essentially free, because the call and return addresses
 400  * are completely predictable.)
 401  *
 402  * For i386, these macros rely on the standard gcc "regparm(3)" calling
 403  * convention, in which the first three arguments are placed in %eax,
 404  * %edx, %ecx (in that order), and the remaining arguments are placed
 405  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 406  * to be modified (either clobbered or used for return values).
 407  * X86_64, on the other hand, already specifies a register-based calling
 408  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
 409  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
 410  * special handling for dealing with 4 arguments, unlike i386.
 411  * However, x86_64 also have to clobber all caller saved registers, which
 412  * unfortunately, are quite a bit (r8 - r11)
 413  *
 414  * The call instruction itself is marked by placing its start address
 415  * and size into the .parainstructions section, so that
 416  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 417  * appropriate patching under the control of the backend pv_init_ops
 418  * implementation.
 419  *
 420  * Unfortunately there's no way to get gcc to generate the args setup
 421  * for the call, and then allow the call itself to be generated by an
 422  * inline asm.  Because of this, we must do the complete arg setup and
 423  * return value handling from within these macros.  This is fairly
 424  * cumbersome.
 425  *
 426  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 427  * It could be extended to more arguments, but there would be little
 428  * to be gained from that.  For each number of arguments, there are
 429  * the two VCALL and CALL variants for void and non-void functions.
 430  *
 431  * When there is a return value, the invoker of the macro must specify
 432  * the return type.  The macro then uses sizeof() on that type to
 433  * determine whether its a 32 or 64 bit value, and places the return
 434  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 435  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
 436  * the return value size.
 437  *
 438  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 439  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
 440  * in low,high order
 441  *
 442  * Small structures are passed and returned in registers.  The macro
 443  * calling convention can't directly deal with this, so the wrapper
 444  * functions must do this.
 445  *
 446  * These PVOP_* macros are only defined within this header.  This
 447  * means that all uses must be wrapped in inline functions.  This also
 448  * makes sure the incoming and outgoing types are always correct.
 449  */
 450 #ifdef CONFIG_X86_32
 451 #define PVOP_VCALL_ARGS                                                 \
 452         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
 453 
 454 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
 455 
 456 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
 457 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
 458 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
 459 
 460 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
 461                                         "=c" (__ecx)
 462 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
 463 
 464 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
 465 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
 466 
 467 #define EXTRA_CLOBBERS
 468 #define VEXTRA_CLOBBERS
 469 #else  /* CONFIG_X86_64 */
 470 /* [re]ax isn't an arg, but the return val */
 471 #define PVOP_VCALL_ARGS                                         \
 472         unsigned long __edi = __edi, __esi = __esi,             \
 473                 __edx = __edx, __ecx = __ecx, __eax = __eax;
 474 
 475 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
 476 
 477 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
 478 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
 479 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
 480 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
 481 
 482 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
 483                                 "=S" (__esi), "=d" (__edx),             \
 484                                 "=c" (__ecx)
 485 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
 486 
 487 /* void functions are still allowed [re]ax for scratch */
 488 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
 489 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
 490 
 491 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
 492 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
 493 #endif  /* CONFIG_X86_32 */
 494 
 495 #ifdef CONFIG_PARAVIRT_DEBUG
 496 #define PVOP_TEST_NULL(op)      BUG_ON(pv_ops.op == NULL)
 497 #else
 498 #define PVOP_TEST_NULL(op)      ((void)pv_ops.op)
 499 #endif
 500 
 501 #define PVOP_RETMASK(rettype)                                           \
 502         ({      unsigned long __mask = ~0UL;                            \
 503                 switch (sizeof(rettype)) {                              \
 504                 case 1: __mask =       0xffUL; break;                   \
 505                 case 2: __mask =     0xffffUL; break;                   \
 506                 case 4: __mask = 0xffffffffUL; break;                   \
 507                 default: break;                                         \
 508                 }                                                       \
 509                 __mask;                                                 \
 510         })
 511 
 512 
 513 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
 514                       pre, post, ...)                                   \
 515         ({                                                              \
 516                 rettype __ret;                                          \
 517                 PVOP_CALL_ARGS;                                         \
 518                 PVOP_TEST_NULL(op);                                     \
 519                 /* This is 32-bit specific, but is okay in 64-bit */    \
 520                 /* since this condition will never hold */              \
 521                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
 522                         asm volatile(pre                                \
 523                                      paravirt_alt(PARAVIRT_CALL)        \
 524                                      post                               \
 525                                      : call_clbr, ASM_CALL_CONSTRAINT   \
 526                                      : paravirt_type(op),               \
 527                                        paravirt_clobber(clbr),          \
 528                                        ##__VA_ARGS__                    \
 529                                      : "memory", "cc" extra_clbr);      \
 530                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 531                 } else {                                                \
 532                         asm volatile(pre                                \
 533                                      paravirt_alt(PARAVIRT_CALL)        \
 534                                      post                               \
 535                                      : call_clbr, ASM_CALL_CONSTRAINT   \
 536                                      : paravirt_type(op),               \
 537                                        paravirt_clobber(clbr),          \
 538                                        ##__VA_ARGS__                    \
 539                                      : "memory", "cc" extra_clbr);      \
 540                         __ret = (rettype)(__eax & PVOP_RETMASK(rettype));       \
 541                 }                                                       \
 542                 __ret;                                                  \
 543         })
 544 
 545 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 546         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
 547                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
 548 
 549 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
 550         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
 551                       PVOP_CALLEE_CLOBBERS, ,                           \
 552                       pre, post, ##__VA_ARGS__)
 553 
 554 
 555 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
 556         ({                                                              \
 557                 PVOP_VCALL_ARGS;                                        \
 558                 PVOP_TEST_NULL(op);                                     \
 559                 asm volatile(pre                                        \
 560                              paravirt_alt(PARAVIRT_CALL)                \
 561                              post                                       \
 562                              : call_clbr, ASM_CALL_CONSTRAINT           \
 563                              : paravirt_type(op),                       \
 564                                paravirt_clobber(clbr),                  \
 565                                ##__VA_ARGS__                            \
 566                              : "memory", "cc" extra_clbr);              \
 567         })
 568 
 569 #define __PVOP_VCALL(op, pre, post, ...)                                \
 570         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
 571                        VEXTRA_CLOBBERS,                                 \
 572                        pre, post, ##__VA_ARGS__)
 573 
 574 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
 575         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
 576                       PVOP_VCALLEE_CLOBBERS, ,                          \
 577                       pre, post, ##__VA_ARGS__)
 578 
 579 
 580 
 581 #define PVOP_CALL0(rettype, op)                                         \
 582         __PVOP_CALL(rettype, op, "", "")
 583 #define PVOP_VCALL0(op)                                                 \
 584         __PVOP_VCALL(op, "", "")
 585 
 586 #define PVOP_CALLEE0(rettype, op)                                       \
 587         __PVOP_CALLEESAVE(rettype, op, "", "")
 588 #define PVOP_VCALLEE0(op)                                               \
 589         __PVOP_VCALLEESAVE(op, "", "")
 590 
 591 
 592 #define PVOP_CALL1(rettype, op, arg1)                                   \
 593         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 594 #define PVOP_VCALL1(op, arg1)                                           \
 595         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
 596 
 597 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
 598         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 599 #define PVOP_VCALLEE1(op, arg1)                                         \
 600         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
 601 
 602 
 603 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 604         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 605                     PVOP_CALL_ARG2(arg2))
 606 #define PVOP_VCALL2(op, arg1, arg2)                                     \
 607         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 608                      PVOP_CALL_ARG2(arg2))
 609 
 610 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
 611         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
 612                           PVOP_CALL_ARG2(arg2))
 613 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
 614         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
 615                            PVOP_CALL_ARG2(arg2))
 616 
 617 
 618 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 619         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 620                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 621 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 622         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 623                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 624 
 625 /* This is the only difference in x86_64. We can make it much simpler */
 626 #ifdef CONFIG_X86_32
 627 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 628         __PVOP_CALL(rettype, op,                                        \
 629                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 630                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 631                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
 632 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 633         __PVOP_VCALL(op,                                                \
 634                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 635                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 636                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 637 #else
 638 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 639         __PVOP_CALL(rettype, op, "", "",                                \
 640                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 641                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 642 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 643         __PVOP_VCALL(op, "", "",                                        \
 644                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
 645                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 646 #endif
 647 
 648 /* Lazy mode for batching updates / context switch */
 649 enum paravirt_lazy_mode {
 650         PARAVIRT_LAZY_NONE,
 651         PARAVIRT_LAZY_MMU,
 652         PARAVIRT_LAZY_CPU,
 653 };
 654 
 655 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
 656 void paravirt_start_context_switch(struct task_struct *prev);
 657 void paravirt_end_context_switch(struct task_struct *next);
 658 
 659 void paravirt_enter_lazy_mmu(void);
 660 void paravirt_leave_lazy_mmu(void);
 661 void paravirt_flush_lazy_mmu(void);
 662 
 663 void _paravirt_nop(void);
 664 u64 _paravirt_ident_64(u64);
 665 
 666 #define paravirt_nop    ((void *)_paravirt_nop)
 667 
 668 /* These all sit in the .parainstructions section to tell us what to patch. */
 669 struct paravirt_patch_site {
 670         u8 *instr;              /* original instructions */
 671         u8 type;                /* type of this instruction */
 672         u8 len;                 /* length of original instruction */
 673 };
 674 
 675 extern struct paravirt_patch_site __parainstructions[],
 676         __parainstructions_end[];
 677 
 678 #endif  /* __ASSEMBLY__ */
 679 
 680 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */